all messages for Guix-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
blob 3bca3b1e401ef14d1f776b4b8b00a5949f9fe153 93318 bytes (raw)
name: guix/ui.scm 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
 
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012-2022 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013, 2018 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
;;; Copyright © 2014 Cyril Roelandt <tipecaml@gmail.com>
;;; Copyright © 2014 Cyrill Schenkel <cyrill.schenkel@gmail.com>
;;; Copyright © 2014, 2015, 2017 Alex Kost <alezost@gmail.com>
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;; Copyright © 2015, 2016 Mathieu Lirzin <mthl@gnu.org>
;;; Copyright © 2016 Roel Janssen <roel@gnu.org>
;;; Copyright © 2016 Benz Schenk <benz.schenk@uzh.ch>
;;; Copyright © 2018 Kyle Meyer <kyle@kyleam.com>
;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2019 Chris Marusich <cmmarusich@gmail.com>
;;; Copyright © 2019, 2020 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2019, 2021 Simon Tournier <zimon.toutoune@gmail.com>
;;; Copyright © 2020 Arun Isaac <arunisaac@systemreboot.net>
;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;; Copyright © 2018 Steve Sprang <scs@stevesprang.com>
;;; Copyright © 2022 Taiju HIGASHI <higashi@taiju.info>
;;; Copyright © 2022 Liliana Marie Prikler <liliana.prikler@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (guix ui)
  #:use-module (guix i18n)
  #:use-module (guix colors)
  #:use-module (guix diagnostics)
  #:use-module (guix gexp)
  #:use-module (guix sets)
  #:use-module (guix utils)
  #:use-module (guix store)
  #:use-module (guix config)
  #:use-module (guix packages)
  #:use-module (guix profiles)
  #:use-module (guix derivations)
  #:use-module (guix build-system)
  #:use-module (guix serialization)
  #:use-module ((guix licenses)
                #:select (license? license-name license-uri))
  #:use-module ((guix build syscalls)
                #:select (free-disk-space terminal-columns terminal-rows
                          with-file-lock/no-wait))
  #:use-module ((guix build utils)
                ;; XXX: All we need are the bindings related to
                ;; '&invoke-error'.  However, to work around the bug described
                ;; in 5d669883ecc104403c5d3ba7d172e9c02234577c, #:hide
                ;; unwanted bindings instead of #:select'ing the needed
                ;; bindings.
                #:hide (package-name->name+version
                        ;; Avoid "overrides core binding" warning.
                        delete))
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-9 gnu)
  #:use-module (srfi srfi-11)
  #:use-module (srfi srfi-19)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-31)
  #:use-module (srfi srfi-34)
  #:use-module (srfi srfi-35)
  #:autoload   (ice-9 ftw)  (scandir)
  #:use-module (ice-9 match)
  #:use-module (ice-9 format)
  #:use-module (ice-9 regex)
  #:autoload   (ice-9 popen) (open-pipe* close-pipe)
  #:autoload   (system repl repl)  (start-repl)
  #:autoload   (system repl debug) (make-debug stack->vector)
  #:use-module (texinfo)
  #:use-module (texinfo plain-text)
  #:use-module (texinfo string-utils)

  ;; Re-exports for backward compatibility.
  #:re-export (G_ N_ P_                           ;now in (guix i18n)

               warning info report-error leave    ;now in (guix diagnostics)
               location->string
               guix-warning-port program-name)
  #:export (display-hint
            make-user-module
            load*
            warn-about-load-error
            show-version-and-exit
            show-bug-report-information
            make-regexp*
            string->number*
            size->number
            show-derivation-outputs
            build-notifier
            show-what-to-build
            show-what-to-build*
            show-manifest-transaction
            guard*
            call-with-error-handling
            with-error-handling
            with-unbound-variable-handling
            leave-on-EPIPE
            read/eval
            read/eval-package-expression
            check-available-space
            indented-string
            fill-paragraph
            %text-width
            texi->plain-text
            package-description-string
            package-synopsis-string
            string->recutils
            package->recutils
            package-specification->name+version+output

            pager-wrapped-port
            with-paginated-output-port
            relevance
            package-relevance
            display-search-results

            with-profile-lock
            string->generations
            string->duration
            matching-generations
            display-generation
            display-profile-content
            display-profile-content-diff
            roll-back*
            switch-to-generation*
            delete-generation*

            %default-message-language
            current-message-language

            run-guix-command
            run-guix
            guix-main))

;;; Commentary:
;;;
;;; User interface facilities for command-line tools.
;;;
;;; Code:

(define (print-unbound-variable-error port key args default-printer)
  ;; Print unbound variable errors more nicely, and in the right language.
  (match args
    ((proc message (variable) _ ...)
     ;; We can always omit PROC because when it's useful (i.e., different from
     ;; "module-lookup"), it gets displayed before.
     (format port (G_ "error: ~a: unbound variable") variable))
    (_
     (default-printer))))

(set-exception-printer! 'unbound-variable print-unbound-variable-error)

(define (make-user-module modules)
  "Return a new user module with the additional MODULES loaded."
  ;; Module in which the machine description file is loaded.
  (let ((module (make-fresh-user-module)))
    (for-each (lambda (iface)
                (module-use! module (resolve-interface iface)))
              modules)
    module))

(define (last-frame-with-source stack)
  "Walk stack upwards and return the last frame that has source location
information, or #f if it could not be found."
  (define (frame-with-source frame)
    ;; Walk from FRAME upwards until source location information is found.
    (let loop ((frame    frame)
               (previous frame))
      (if (not frame)
          previous

          ;; On Guile 3, the latest frame with source may be that of
          ;; 'raise-exception' in boot-9.scm.  Skip it.
          (if (and (frame-source frame)
                   (not (eq? 'raise-exception (frame-procedure-name frame))))
              frame
              (loop (frame-previous frame) frame)))))

  (let* ((depth (stack-length stack))
         (last  (and (> depth 0) (stack-ref stack 0))))
    (frame-with-source (if (> depth 1)
                           (stack-ref stack 1)    ;skip the 'throw' frame
                           last))))

(define-syntax-rule (without-compiler-optimizations exp)
  ;; Compile with the baseline compiler (-O1), which is much less expensive
  ;; than -O2.
  (parameterize (((@ (system base compile) default-optimization-level) 1))
    exp))

(define* (load* file user-module
                #:key (on-error 'nothing-special))
  "Load the user provided Scheme source code FILE."
  (define (error-string frame args)
    (call-with-output-string
      (lambda (port)
        (apply display-error frame port (cdr args)))))

  (define tag
    (make-prompt-tag "user-code"))

  (catch #t
    (lambda ()
      ;; XXX: Force a recompilation to avoid ABI issues.
      (set! %fresh-auto-compile #t)
      (set! %load-should-auto-compile #t)

      (save-module-excursion
       (lambda ()
         (set-current-module user-module)

         ;; Hide the "auto-compiling" messages.
         (parameterize ((current-warning-port (%make-void-port "w")))
           (call-with-prompt tag
             (lambda ()
               ;; Give 'load' an absolute file name so that it doesn't try to
               ;; search for FILE in %LOAD-PATH.  Note: use 'load', not
               ;; 'primitive-load', so that FILE is compiled, which then allows
               ;; us to provide better error reporting with source line numbers.
               (without-compiler-optimizations
                (load (canonicalize-path file))))
             (const #f))))))
    (lambda _
      ;; XXX: Errors are reported from the pre-unwind handler below, but
      ;; calling 'exit' from there has no effect, so we call it here.
      (exit 1))
    (rec (handle-error . args)
         ;; Capture the stack up to this procedure call, excluded, and pass
         ;; the faulty stack frame to 'report-load-error'.
         (let* ((stack (make-stack #t handle-error tag))
                (frame (last-frame-with-source stack)))

           (report-load-error file args frame)

           (case on-error
             ((debug)
              (newline)
              (display (G_ "entering debugger; type ',bt' for a backtrace\n"))
              (start-repl #:debug (make-debug (stack->vector stack) 0
                                              (error-string frame args)
                                              #f)))
             ((backtrace)
              (newline (current-error-port))
              (display-backtrace stack (current-error-port)))
             (else
              #t))))))

(define (known-variable-definition variable)
  "Search among the currently loaded modules one that defines a variable named
VARIABLE and return it, or #f if none was found."
  (define (module<? m1 m2)
    (match (module-name m2)
      (('gnu _ ...) #t)
      (('guix _ ...)
       (match (module-name m1)
         (('gnu _ ...) #f)
         (_ #t)))
      (_ #f)))

  (let loop ((modules     (list (resolve-module '() #f #f #:ensure #f)))
             (suggestions '())
             (visited     (setq)))
    (match modules
      (()
       ;; Pick the "best" suggestion.
       (match (sort suggestions module<?)
         (() #f)
         ((first _ ...) first)))
      ((head tail ...)
       (if (set-contains? visited head)
           (loop tail suggestions visited)
           (let ((visited (set-insert head visited))
                 (next    (append tail
                                  (hash-map->list (lambda (name module)
                                                    module)
                                                  (module-submodules head)))))
             (match (and=> (module-public-interface head)
                           (cut module-local-variable <> variable))
               (#f (loop next suggestions visited))
               (_
                (match (module-name head)
                  (('gnu _ ...) head)             ;must be that one
                  (_ (loop next (cons head suggestions) visited)))))))))))

(define %hint-color (color BOLD CYAN))

(define* (display-hint message #:optional (port (current-error-port)))
  "Display MESSAGE, a l10n message possibly containing Texinfo markup, to
PORT."
  (define colorize
    (if (color-output? port)
        (lambda (str)
          (colorize-string str %hint-color))
        identity))

  (display (colorize (G_ "hint: ")) port)
  (display
   ;; XXX: We should arrange so that the initial indent is wider.
   (parameterize ((%text-width (max 15 (- (terminal-columns) 5))))
     (texi->plain-text message))
   port))

(define* (report-unbound-variable-error args #:key frame)
  "Return the given unbound-variable error, where ARGS is the list of 'throw'
arguments."
  (match args
    ((key . args)
     (print-exception (current-error-port) frame key args)))
  (match args
    (('unbound-variable proc message (variable) _ ...)
     (match (known-variable-definition variable)
       (#f
        (display-hint (G_ "Did you forget a @code{use-modules} form?")))
       ((? module? module)
        (display-hint (format #f (G_ "Did you forget @code{(use-modules ~a)}?")
                              (module-name module))))))))

(define (check-module-matches-file module file)
  "Check whether FILE starts with 'define-module MODULE' and print a hint if
it doesn't."
  ;; This is a common mistake when people start writing their own package
  ;; definitions and try loading them with 'guix build -L …', so help them
  ;; diagnose the problem.
  (define (hint)
    (display-hint (format #f (G_ "File @file{~a} should probably start with:

@example\n(define-module ~a)\n@end example")
                          file module)))

  (catch 'system-error
    (lambda ()
      (let* ((sexp (call-with-input-file file read))
             (loc  (and (pair? sexp)
                        (source-properties->location (source-properties sexp)))))
        (match sexp
          (('define-module (names ...) _ ...)
           (unless (equal? module names)
             (warning loc
                      (G_ "module name ~a does not match file name '~a'~%")
                      names (module->source-file-name module))
             (hint)))
          ((? eof-object?)
           (warning (G_ "~a: file is empty~%") file))
          (else
           (hint)))))
    (const #f)))

(define* (report-load-error file args #:optional frame)
  "Report the failure to load FILE, a user-provided Scheme file.
ARGS is the list of arguments received by the 'throw' handler."
  (match args
    (('system-error . rest)
     (let ((err (system-error-errno args)))
       (report-error (G_ "failed to load '~a': ~a~%") file (strerror err))))
    (('read-error _ message args ...)
     ;; Guile's missing-paren messages are obscure so we make them more
     ;; intelligible here.
     (if (or (string-suffix? "end of file" message) ;Guile < 3.0.6
             (and (string-contains message "unexpected end of input")
                  (member '(#\)) args)))
         (let ((location (string-take message
                                      (+ 2 (string-contains message ": ")))))
           (format (current-error-port) (G_ "~amissing closing parenthesis~%")
                   location))
         (report-error (G_ "read error while loading '~a': ~a~%")
                       file (apply format #f message args))))
    (('syntax-error proc message properties form subform . rest)
     (let ((loc (source-properties->location properties)))
       (report-error loc (G_ "~s: ~a~%")
                     (or subform form) message)))
    (('unbound-variable _ ...)
     (report-unbound-variable-error args #:frame frame))
    (((or 'srfi-34 '%exception) obj)
     (cond ((message-condition? obj)
            (report-error (and (error-location? obj)
                               (error-location obj))
                          (G_ "~a~%")
                          (gettext (condition-message obj) %gettext-domain)))
           ((formatted-message? obj)
            (apply report-error
                   (and (error-location? obj) (error-location obj))
                   (gettext (formatted-message-string obj) %gettext-domain)
                   (formatted-message-arguments obj)))
           (else
            (report-error (G_ "exception thrown: ~s~%") obj)))
     (when (fix-hint? obj)
       (display-hint (condition-fix-hint obj))))
    ((key args ...)
     (report-error (G_ "failed to load '~a':~%") file)
     (match args
       (((? symbol? proc) (? string? message) (args ...) . rest)
        (display-error frame (current-error-port) proc message
                       args rest))
       (_
        ;; Some exceptions like 'git-error' do not follow Guile's convention
        ;; above and need to be printed with 'print-exception'.
        (print-exception (current-error-port) frame key args))))))

(define (warn-about-load-error file module args)  ;FIXME: factorize with ↑
  "Report the failure to load FILE, a user-provided Scheme file, without
exiting.  ARGS is the list of arguments received by the 'throw' handler."
  (match args
    (('system-error . rest)
     (let ((err (system-error-errno args)))
       (warning (G_ "failed to load '~a': ~a~%") module (strerror err))))
    (('syntax-error proc message properties form . rest)
     (let ((loc (source-properties->location properties)))
       (warning loc (G_ "~a~%") message)))
    (('unbound-variable _ ...)
     (report-unbound-variable-error args))
    (((or 'srfi-34 '%exception) obj)
     (cond ((message-condition? obj)
            (warning (G_ "failed to load '~a': ~a~%")
                     file
                     (gettext (condition-message obj) %gettext-domain)))
           ((formatted-message? obj)
            (warning (G_ "failed to load '~a': ~a~%")
                     file
                     (apply format #f
                            (gettext (formatted-message-string obj)
                                     %gettext-domain)
                            (formatted-message-arguments obj))))
           (else
            (warning (G_ "failed to load '~a': exception thrown: ~s~%")
                     file obj))))
    ((error args ...)
     (warning (G_ "failed to load '~a':~%") module)
     (apply display-error #f (current-error-port) args)
     (check-module-matches-file module file))))

(define (call-with-unbound-variable-handling thunk)
  (define tag
    (make-prompt-tag "user-code"))

  (catch 'unbound-variable
    (lambda ()
      (call-with-prompt tag
        thunk
        (const #f)))
    (const #t)
    (rec (handle-error . args)
         (let* ((stack (make-stack #t handle-error tag))
                (frame (and stack (last-frame-with-source stack))))
           (report-unbound-variable-error args #:frame frame)
           (exit 1)))))

(define-syntax-rule (with-unbound-variable-handling exp ...)
  "Capture 'unbound-variable' exceptions in the dynamic extent of EXP... and
report them in a user-friendly way."
  (call-with-unbound-variable-handling (lambda () exp ...)))

(define %default-message-language
  ;; Default language to use for messages.
  (make-parameter "en"))

(define (current-message-language)
  "Return the language used for messages according to the current locale.
Return %DEFAULT-MESSAGE-LANGUAGE if that information could not be obtained.  The
result is an ISO-639-2 language code such as \"ar\", without the territory
part."
  (let ((locale (setlocale LC_MESSAGES)))
    (match (string-index locale #\_)
      (#f    locale)
      (index (string-take locale index)))))

(define (install-locale)
  "Install the current locale settings."
  (catch 'system-error
    (lambda _
      (setlocale LC_ALL ""))
    (lambda args
      (display-hint (G_ "Consider installing the @code{glibc-locales} package
and defining @code{GUIX_LOCPATH}, along these lines:

@example
guix install glibc-locales
export GUIX_LOCPATH=\"$HOME/.guix-profile/lib/locale\"
@end example

See the \"Application Setup\" section in the manual, for more info.\n"))
      ;; We're now running in the "C" locale.  Try to install a UTF-8 locale
      ;; instead.  This one is guaranteed to be available in 'guix' from 'guix
      ;; pull'.
      (false-if-exception (setlocale LC_ALL "en_US.utf8")))))

(define (initialize-guix)
  "Perform the usual initialization for stand-alone Guix commands."
  ;; By default don't annoy users with deprecation warnings.  In practice,
  ;; 'define-deprecated' in (ice-9 deprecated) arranges so that those warnings
  ;; are emitted at expansion-time only, but there are cases where they could
  ;; slip through, for instance when interpreting code.
  (unless (getenv "GUILE_WARN_DEPRECATED")
    (debug-disable 'warn-deprecated))

  (install-locale)
  (textdomain %gettext-domain)

  ;; Ignore SIGPIPE.  If the daemon closes the connection, we prefer to be
  ;; notified via an EPIPE later.
  (sigaction SIGPIPE SIG_IGN)

  (setvbuf (current-output-port) 'line)
  (setvbuf (current-error-port) 'line))

(define* (show-version-and-exit #:optional (command (car (command-line))))
  "Display version information for COMMAND and `(exit 0)'."
  (simple-format #t "~a (~a) ~a~%"
                 command %guix-package-name %guix-version)
  (format #t "Copyright ~a 2022 ~a"
          ;; TRANSLATORS: Translate "(C)" to the copyright symbol
          ;; (C-in-a-circle), if this symbol is available in the user's
          ;; locale.  Otherwise, do not translate "(C)"; leave it as-is.  */
          (G_ "(C)")
          (G_ "the Guix authors\n"))
  (display (G_"\
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
"))
  (exit 0))

(define (show-bug-report-information)
  ;; TRANSLATORS: The placeholder indicates the bug-reporting address for this
  ;; package.  Please add another line saying "Report translation bugs to
  ;; ...\n" with the address for translation bugs (typically your translation
  ;; team's web or email address).
  (format #t (G_ "
Report bugs to: ~a.") %guix-bug-report-address)
  (format #t (G_ "
~a home page: <~a>") %guix-package-name %guix-home-page-url)
  (format #t (G_ "
General help using Guix and GNU software: <~a>")
          ;; TRANSLATORS: Change the "/en" bit of this URL appropriately if
          ;; the web site is translated in your language.
          (G_ "https://guix.gnu.org/en/help/"))
  (newline))

(define (augmented-system-error-handler file)
  "Return a 'system-error' handler that mentions FILE in its message."
  (lambda (key proc fmt args errno)
    ;; Augment the FMT and ARGS with information about TARGET (this
    ;; information is missing as of Guile 2.0.11, making the exception
    ;; uninformative.)
    (apply throw key proc "~A: ~S"
           (list (strerror (car errno)) file)
           (list errno))))

(define-syntax apply-formals
  (syntax-rules ()
    ((_ proc (args ...)) (proc args ...))
    ((_ proc (arg1 args ... . rest)) (apply proc arg1 args ... rest))))

(define-syntax-rule (error-reporting-wrapper proc formals file)
  "Wrap PROC such that its 'system-error' exceptions are augmented to mention
FILE."
  (let ((real-proc (@ (guile) proc)))
    (lambda formals
      (catch 'system-error
        (lambda ()
          (apply-formals real-proc formals))
        (augmented-system-error-handler file)))))

(set! symlink
  ;; We 'set!' the global binding because (gnu build ...) modules and similar
  ;; typically don't use (guix ui).
  (error-reporting-wrapper symlink (source target) target))

(set! copy-file
  ;; Note: here we use 'set!', not #:replace, because UIs typically use
  ;; 'copy-recursively', which doesn't use (guix ui).
  (error-reporting-wrapper copy-file (source target) target))

(set! canonicalize-path
  (error-reporting-wrapper canonicalize-path (file) file))

(set! delete-file
  (error-reporting-wrapper delete-file (file) file))

(set! execlp
  (error-reporting-wrapper execlp (filename . args) filename))

(define (make-regexp* regexp . flags)
  "Like 'make-regexp' but error out if REGEXP is invalid, reporting the error
nicely."
  (catch 'regular-expression-syntax
    (lambda ()
      (apply make-regexp regexp flags))
    (lambda (key proc message . rest)
      (leave (G_ "'~a' is not a valid regular expression: ~a~%")
             regexp message))))

(define (string->number* str)
  "Like `string->number', but error out with an error message on failure."
  (or (string->number str)
      (leave (G_ "~a: invalid number~%") str)))

(define (size->number str)
  "Convert STR, a storage measurement representation such as \"1024\" or
\"1MiB\", to a number of bytes.  Raise an error if STR could not be
interpreted."
  (define unit-pos
    (string-rindex str
                   (char-set-union (char-set #\.) char-set:digit)))

  (define unit
    (and unit-pos (substring str (+ 1 unit-pos))))

  (let* ((numstr (if unit-pos
                     (substring str 0 (+ 1 unit-pos))
                     str))
         (num    (string->number numstr)))
    (unless num
      (leave (G_ "invalid number: ~a~%") numstr))

    ((compose inexact->exact round)
     (* num
        (match unit
          ((or "KiB" "K" "k") (expt 2 10))
          ((or "MiB" "M")     (expt 2 20))
          ((or "GiB" "G")     (expt 2 30))
          ((or "TiB" "T")     (expt 2 40))
          ((or "PiB" "P")     (expt 2 50))
          ((or "EiB" "E")     (expt 2 60))
          ((or "ZiB" "Z")     (expt 2 70))
          ((or "YiB" "Y")     (expt 2 80))
          ("kB"  (expt 10 3))
          ("MB"  (expt 10 6))
          ("GB"  (expt 10 9))
          ("TB"  (expt 10 12))
          ("PB"  (expt 10 15))
          ("EB"  (expt 10 18))
          ("ZB"  (expt 10 21))
          ("YB"  (expt 10 24))
          (""    1)
          (x
           (leave (G_ "unknown unit: ~a~%") unit)))))))

(define (display-collision-resolution-hint collision)
  "Display hints on how to resolve COLLISION, a &profile-collistion-error."
  (define (top-most-entry entry)
    (let loop ((entry entry))
      (match (force (manifest-entry-parent entry))
        (#f entry)
        (parent (loop parent)))))

  (let* ((first  (profile-collision-error-entry collision))
         (second (profile-collision-error-conflict collision))
         (name1  (manifest-entry-name (top-most-entry first)))
         (name2  (manifest-entry-name (top-most-entry second))))
    (if (string=? name1 name2)
        (display-hint (format #f (G_ "You cannot have two different versions
or variants of @code{~a} in the same profile.")
                              name1))
        (display-hint (format #f (G_ "Try upgrading both @code{~a} and @code{~a},
or remove one of them from the profile.")
                              name1 name2)))))

;; On Guile 3.0, in 'call-with-error-handling' we need to re-raise.  To
;; preserve useful backtraces in case of unhandled errors, we want that to
;; happen before the stack has been unwound, hence 'guard*'.
(define-syntax-rule (guard* (var clauses ...) exp ...)
  "This variant of SRFI-34 'guard' does not unwind the stack before
evaluating the tests and bodies of CLAUSES."
  (with-exception-handler
      (lambda (var)
        (cond clauses ... (else (raise var))))
    (lambda () exp ...)
    #:unwind? #f))

(define (call-with-error-handling thunk)
  "Call THUNK within a user-friendly error handler."
  (define (port-filename* port)
    ;; 'port-filename' returns #f for non-file ports, but it raises an
    ;; exception for file ports that are closed.  Work around that.
    (and (not (port-closed? port))
         (port-filename port)))

  (guard* (c ((package-input-error? c)
              (let* ((package  (package-error-package c))
                     (input    (package-error-invalid-input c))
                     (location (package-location package))
                     (file     (location-file location))
                     (line     (location-line location))
                     (column   (location-column location)))
                (leave (G_ "~a:~a:~a: package `~a' has an invalid input: ~s~%")
                       file line column
                       (package-full-name package) input)))
             ((package-cross-build-system-error? c)
              (let* ((package (package-error-package c))
                     (loc     (package-location package))
                     (system  (package-build-system package)))
                (leave (G_ "~a: ~a: build system `~a' does not support cross builds~%")
                       (location->string loc)
                       (package-full-name package)
                       (build-system-name system))))
             ((gexp-input-error? c)
              (let ((input (gexp-error-invalid-input c)))
                (leave (G_ "~s: invalid G-expression input~%")
                       (gexp-error-invalid-input c))))
             ((profile-not-found-error? c)
              (leave (G_ "profile '~a' does not exist~%")
                     (profile-error-profile c)))
             ((missing-generation-error? c)
              (leave (G_ "generation ~a of profile '~a' does not exist~%")
                     (missing-generation-error-generation c)
                     (profile-error-profile c)))
             ((unmatched-pattern-error? c)
              (let ((pattern (unmatched-pattern-error-pattern c)))
                (leave (G_ "package '~a~@[@~a~]~@[:~a~]' not found in profile~%")
                       (manifest-pattern-name pattern)
                       (manifest-pattern-version pattern)
                       (match (manifest-pattern-output pattern)
                         ("out" #f)
                         (output output)))))
             ((profile-collision-error? c)
              (let ((entry    (profile-collision-error-entry c))
                    (conflict (profile-collision-error-conflict c)))
                (define (report-parent-entries entry)
                  (let ((parent (force (manifest-entry-parent entry))))
                    (when (manifest-entry? parent)
                      (report-error (G_ "   ... propagated from ~a@~a~%")
                                    (manifest-entry-name parent)
                                    (manifest-entry-version parent))
                      (report-parent-entries parent))))

                (define (manifest-entry-output* entry)
                  (match (manifest-entry-output entry)
                    ("out"   "")
                    (output (string-append ":" output))))

                (report-error (G_ "profile contains conflicting entries for ~a~a~%")
                              (manifest-entry-name entry)
                              (manifest-entry-output* entry))
                (report-error (G_ "  first entry: ~a@~a~a ~a~%")
                              (manifest-entry-name entry)
                              (manifest-entry-version entry)
                              (manifest-entry-output* entry)
                              (manifest-entry-item entry))
                (report-parent-entries entry)
                (report-error (G_ "  second entry: ~a@~a~a ~a~%")
                              (manifest-entry-name conflict)
                              (manifest-entry-version conflict)
                              (manifest-entry-output* conflict)
                              (manifest-entry-item conflict))
                (report-parent-entries conflict)
                (display-collision-resolution-hint c)
                (exit 1)))
             ((nar-error? c)
              (let ((file (nar-error-file c))
                    (port (nar-error-port c)))
                (if file
                    (leave (G_ "corrupt input while restoring '~a' from ~s~%")
                           file (or (port-filename* port) port))
                    (leave (G_ "corrupt input while restoring archive from ~s~%")
                           (or (port-filename* port) port)))))
             ((store-connection-error? c)
              (leave (G_ "failed to connect to `~a': ~a~%")
                     (store-connection-error-file c)
                     (strerror (store-connection-error-code c))))
             ((store-protocol-error? c)
              ;; FIXME: Server-provided error messages aren't i18n'd.
              (leave (G_ "~a~%")
                     (store-protocol-error-message c)))
             ((derivation-missing-output-error? c)
              (leave (G_ "reference to invalid output '~a' of derivation '~a'~%")
                     (derivation-missing-output c)
                     (derivation-file-name (derivation-error-derivation c))))
             ((file-search-error? c)
              (leave (G_ "file '~a' could not be found in these \
directories:~{ ~a~}~%")
                     (file-search-error-file-name c)
                     (file-search-error-search-path c)))
             ((invoke-error? c)
              (leave (G_ "program exited\
~@[ with non-zero exit status ~a~]\
~@[ terminated by signal ~a~]\
~@[ stopped by signal ~a~]: ~s~%")
                     (invoke-error-exit-status c)
                     (invoke-error-term-signal c)
                     (invoke-error-stop-signal c)
                     (cons (invoke-error-program c)
                           (invoke-error-arguments c))))

             ((formatted-message? c)
              (apply report-error
                     (and (error-location? c) (error-location c))
                     (gettext (formatted-message-string c) %gettext-domain)
                     (formatted-message-arguments c))
              (when (fix-hint? c)
                (display-hint (condition-fix-hint c)))
              (exit 1))

             ;; On Guile 3.0.0, exceptions such as 'unbound-variable' are
             ;; compound and include a '&message'.  However, that message only
             ;; contains the format string.  Thus, special-case it here to
             ;; avoid displaying a bare format string.
             ;;
             ;; Furthermore, use of 'guard*' ensures that the stack has not
             ;; been unwound when we re-raise, since that would otherwise show
             ;; useless backtraces.
             (((exception-predicate &exception-with-kind-and-args) c)
              (if (eq? 'system-error (exception-kind c)) ;EPIPE & co.
                  (match (exception-args c)
                    ((proc format-string format-args . _)
                     (leave (G_ "~a: ~a~%") proc
                            (apply format #f format-string format-args))))
                  (raise c)))

             ((message-condition? c)
              ;; Normally '&message' error conditions have an i18n'd message.
              (report-error (and (error-location? c) (error-location c))
                            (G_ "~a~%")
                            (gettext (condition-message c) %gettext-domain))
              (when (fix-hint? c)
                (display-hint (condition-fix-hint c)))
              (exit 1)))
      (thunk)))

(define-syntax-rule (leave-on-EPIPE exp ...)
  "Run EXP... in a context where EPIPE errors are caught and lead to 'exit'
with successful exit code.  This is useful when writing to the standard output
may lead to EPIPE, because the standard output is piped through 'head' or
similar."
  (catch 'system-error
    (lambda ()
      exp ...)
    (lambda args
      ;; We really have to exit this brutally, otherwise Guile eventually
      ;; attempts to flush all the ports, leading to an uncaught EPIPE down
      ;; the path.
      (if (= EPIPE (system-error-errno args))
          (primitive-_exit 0)
          (apply throw args)))))

(define %guix-user-module
  ;; Module in which user expressions are evaluated.
  ;; Compute lazily to avoid circularity with (guix gexp).
  (delay
    (let ((module (make-module)))
      (beautify-user-module! module)
      ;; Use (guix gexp) so that one can use #~ & co.
      (module-use! module (resolve-interface '(guix gexp)))
      module)))

(define (read/eval str)
  "Read and evaluate STR, raising an error if something goes wrong."
  (let ((exp (catch #t
               (lambda ()
                 (call-with-input-string str read))
               (lambda args
                 (leave (G_ "failed to read expression ~s: ~s~%")
                        str args)))))
    (catch #t
      (lambda ()
        (eval exp (force %guix-user-module)))
      (lambda args
        (report-error (G_ "failed to evaluate expression '~a':~%") exp)
        (match args
          (('syntax-error proc message properties form . rest)
           (report-error (G_ "syntax error: ~a~%") message))
          (((or 'srfi-34 '%exception) obj)
           (cond ((message-condition? obj)
                  (report-error (G_ "~a~%")
                                (gettext (condition-message obj)
                                         %gettext-domain)))
                 ((formatted-message? obj)
                  (apply report-error #f
                         (gettext (formatted-message-string obj)
                                  %gettext-domain)
                         (formatted-message-arguments obj)))
                 (else
                  (report-error (G_ "exception thrown: ~s~%") obj))))
          ((error args ...)
           (apply display-error #f (current-error-port) args))
          (what? #f))
        (exit 1)))))

(define (read/eval-package-expression str)
  "Read and evaluate STR and return the package it refers to, or exit an
error."
  (match (read/eval str)
    ((? package? p) p)
    (x
     (leave (G_ "expression ~s does not evaluate to a package~%")
            str))))

(define (show-derivation-outputs derivation)
  "Show the output file names of DERIVATION, which can be a derivation or a
derivation input."
  (define (show-outputs derivation outputs)
    (format #t "~{~a~%~}"
            (map (cut derivation->output-path derivation <>)
                 outputs)))

  (match derivation
    ((? derivation?)
     (show-outputs derivation (derivation-output-names derivation)))
    ((? derivation-input? input)
     (show-outputs (derivation-input-derivation input)
                   (derivation-input-sub-derivations input)))))

(define* (check-available-space need
                                #:optional (directory (%store-prefix)))
  "Make sure at least NEED bytes are available in DIRECTORY.  Otherwise emit a
warning."
  (let ((free (catch 'system-error
                (lambda ()
                  (free-disk-space directory))
                (const #f))))
    (when (and free (>= need free))
      (warning (G_ "at least ~,1h MB needed but only ~,1h MB available in ~a~%")
               (/ need 1e6) (/ free 1e6) directory))))

(define (graft-derivation? drv)
  "Return true if DRV is definitely a graft derivation, false otherwise."
  (match (assq-ref (derivation-properties drv) 'type)
    ('graft #t)
    (_ #f)))

(define (profile-hook-derivation? drv)
  "Return true if DRV is definitely a profile hook derivation, false otherwise."
  (match (assq-ref (derivation-properties drv) 'type)
    ('profile-hook #t)
    (_ #f)))

(define (colorize-store-file-name file)
  "Colorize FILE, a store file name, such that the hash part is less prominent
than the rest."
  (let ((len    (string-length file))
        (prefix (+ (string-length (%store-prefix)) 32 2)))
    (if (< len prefix)
        file
        (string-append (colorize-string (string-take file prefix)
                                        (color DARK))
                       (string-drop file prefix)))))

(define %default-verbosity
  ;; Default verbosity level for 'show-what-to-build'.
  2)

(define* (show-what-to-build store drv
                             #:key dry-run? (use-substitutes? #t)
                             (verbosity %default-verbosity)
                             (mode (build-mode normal)))
  "Show what will or would (depending on DRY-RUN?) be built in realizing the
derivations listed in DRV using MODE, a 'build-mode' value.  The elements of
DRV can be either derivations or derivation inputs.

Return two values: a Boolean indicating whether there's something to build,
and a Boolean indicating whether there's something to download.

When USE-SUBSTITUTES?, check and report what is prerequisites are available
for download.  VERBOSITY is an integer indicating the level of details to be
shown: level 2 and higher provide all the details, level 1 shows a high-level
summary, and level 0 shows nothing."
  (define inputs
    (map (match-lambda
           ((? derivation? drv) (derivation-input drv))
           ((? derivation-input? input) input))
         drv))

  (define substitutable-info
    ;; Call 'substitution-oracle' upfront so we don't end up launching the
    ;; substituter many times.  This makes a big difference, especially when
    ;; DRV is a long list as is the case with 'guix environment'.
    (if use-substitutes?
        (substitution-oracle store inputs #:mode mode)
        (const #f)))

  (define colorized-store-item
    (if (color-output? (current-error-port))
        colorize-store-file-name
        identity))

  (let*-values (((build/full download)
                 (derivation-build-plan store inputs
                                        #:mode mode
                                        #:substitutable-info
                                        substitutable-info))
                ((graft hook build)
                 (match (fold (lambda (drv acc)
                                (let ((file (derivation-file-name drv)))
                                  (match acc
                                    ((#:graft graft #:hook hook #:build build)
                                     (cond
                                      ((graft-derivation? drv)
                                       `(#:graft ,(cons file graft)
                                         #:hook ,hook
                                         #:build ,build))
                                      ((profile-hook-derivation? drv)
                                       `(#:graft ,graft
                                         #:hook ,(cons file hook)
                                         #:build ,build))
                                      (else
                                       `(#:graft ,graft
                                         #:hook ,hook
                                         #:build ,(cons file build))))))))
                              '(#:graft () #:hook () #:build ())
                              build/full)
                   ((#:graft graft #:hook hook #:build build)
                    (values graft hook build)))))
    (define installed-size
      (reduce + 0 (map substitutable-nar-size download)))

    (define download-size
      (/ (reduce + 0 (map substitutable-download-size download))
         1e6))

    (define display-download-size?
      ;; Sometimes narinfos lack information about the download size.  Only
      ;; display when we have information for all of DOWNLOAD.
      (not (any (compose zero? substitutable-download-size) download)))

    ;; Combinatorial explosion ahead along two axes: DRY-RUN? and VERBOSITY.
    ;; Unfortunately, this is hardly avoidable for proper i18n.
    (if dry-run?
        (begin
          (unless (or (zero? verbosity) (null? build))
            (format (current-error-port)
                    (highlight/warn
                     (N_ "The following derivation would be built:~%"
                         "The following derivations would be built:~%"
                         (length build))))
            (format (current-error-port) "~{  ~a~%~}"
                    (map colorized-store-item build)))
          (cond ((>= verbosity 2)
                 (if display-download-size?
                     (begin
                       (format (current-error-port)
                               (highlight
                                ;; TRANSLATORS: "MB" is for "megabyte"; it
                                ;; should be translated to the corresponding
                                ;; abbreviation.
                                (G_ "~:[~,1h MB would be downloaded:~%~;~]"))
                               (null? download)
                               download-size)
                       (format (current-error-port) "~{  ~a~%~}"
                               (map (compose colorized-store-item substitutable-path)
                                    download)))
                     (begin
                       (format (current-error-port)
                               (highlight
                                (N_ "~:[The following file would be downloaded:~%~;~]"
                                    "~:[The following files would be downloaded:~%~;~]"
                                    (length download)))
                               (null? download))
                       (format (current-error-port) "~{  ~a~%~}"
                               (map (compose colorized-store-item substitutable-path)
                                    download))))
                 (format (current-error-port)
                         (N_ "~:[The following graft would be made:~%~{   ~a~%~}~;~]"
                             "~:[The following grafts would be made:~%~{   ~a~%~}~;~]"
                             (length graft))
                         (null? graft) (map colorized-store-item graft))
                 (format (current-error-port)
                         (N_ "~:[The following profile hook would be built:~%~{   ~a~%~}~;~]"
                             "~:[The following profile hooks would be built:~%~{   ~a~%~}~;~]"
                             (length hook))
                         (null? hook) (map colorized-store-item hook)))
                ((= verbosity 1)
                 ;; Display the bare minimum; don't mention grafts and hooks.
                 (unless (null? build)
                   (newline (current-error-port)))
                 (if display-download-size?
                     (format (current-error-port)
                             ;; TRANSLATORS: "MB" is for "megabyte"; it should be
                             ;; translated to the corresponding abbreviation.
                             (highlight (G_ "~:[~,1h MB would be downloaded~%~;~]"))
                             (null? download) download-size)
                     (format (current-error-port)
                             (highlight
                              (N_ "~:[~h item would be downloaded~%~;~]"
                                  "~:[~h items would be downloaded~%~;~]"
                                  (length download)))
                             (null? download) (length download))))))

        (begin
          (unless (or (zero? verbosity) (null? build))
            (format (current-error-port)
                    (highlight/warn
                     (N_ "The following derivation will be built:~%"
                         "The following derivations will be built:~%"
                         (length build))))
            (format (current-error-port) "~{  ~a~%~}"
                    (map colorized-store-item build)))
          (cond ((>= verbosity 2)
                 (if display-download-size?
                     (begin
                       (format (current-error-port)
                               (highlight
                                ;; TRANSLATORS: "MB" is for "megabyte"; it
                                ;; should be translated to the corresponding
                                ;; abbreviation.
                                (G_ "~:[~,1h MB will be downloaded:~%~;~]"))
                               (null? download)
                               download-size)
                       (format (current-error-port) "~{  ~a~%~}"
                               (map (compose colorized-store-item substitutable-path)
                                    download)))
                     (begin
                       (format (current-error-port)
                               (highlight
                                (N_ "~:[The following file will be downloaded:~%~;~]"
                                    "~:[The following files will be downloaded:~%~;~]"
                                    (length download)))
                               (null? download))
                       (format (current-error-port) "~{  ~a~%~}"
                               (map (compose colorized-store-item substitutable-path)
                                    download))))
                 (format (current-error-port)
                         (N_ "~:[The following graft will be made:~%~{   ~a~%~}~;~]"
                             "~:[The following grafts will be made:~%~{   ~a~%~}~;~]"
                             (length graft))
                         (null? graft) (map colorized-store-item graft))
                 (format (current-error-port)
                         (N_ "~:[The following profile hook will be built:~%~{   ~a~%~}~;~]"
                             "~:[The following profile hooks will be built:~%~{   ~a~%~}~;~]"
                             (length hook))
                         (null? hook) (map colorized-store-item hook)))
                ((= verbosity 1)
                 ;; Display the bare minimum; don't mention grafts and hooks.
                 (unless (null? build)
                   (newline (current-error-port)))
                 (if display-download-size?
                     (format (current-error-port)
                             ;; TRANSLATORS: "MB" is for "megabyte"; it should be
                             ;; translated to the corresponding abbreviation.
                             (highlight (G_ "~:[~,1h MB will be downloaded~%~;~]"))
                             (null? download) download-size)
                     (format (current-error-port)
                             (highlight
                              (N_ "~:[~h item will be downloaded~%~;~]"
                                  "~:[~h items will be downloaded~%~;~]"
                                  (length download)))
                             (null? download) (length download)))))))

    (check-available-space installed-size)

    (values (pair? build/full) (pair? download))))

(define show-what-to-build*
  (store-lift show-what-to-build))

(define* (build-notifier #:key (dry-run? #f) (use-substitutes? #t)
                         (verbosity %default-verbosity))
  "Return a procedure suitable for 'with-build-handler' that, when
'build-things' is called, invokes 'show-what-to-build' to display the build
plan.  When DRY-RUN? is true, the 'with-build-handler' form returns without
any build happening."
  (define not-comma
    (char-set-complement (char-set #\,)))

  (define (read-derivation-from-file* item)
    (catch 'system-error
      (lambda ()
        (read-derivation-from-file item))
      (const #f)))

  (lambda (continue store things mode)
    (define inputs
      ;; List of derivation inputs to build.  Filter out non-existent '.drv'
      ;; files because the daemon transparently tries to substitute them.
      (filter-map (match-lambda
                    (((? derivation-path? drv) . output)
                     (let ((drv     (read-derivation-from-file* drv))
                           (outputs (string-tokenize output not-comma)))
                       (and drv (derivation-input drv outputs))))
                    ((? derivation-path? drv)
                     (and=> (read-derivation-from-file* drv)
                            derivation-input))
                    (_
                     #f))
                  things))

    (let-values (((build? download?)
                  (show-what-to-build store inputs
                                      #:dry-run? dry-run?
                                      #:use-substitutes? use-substitutes?
                                      #:verbosity verbosity
                                      #:mode mode)))

      (unless (and (or build? download?)
                   dry-run?)
        (continue #t)))))

(define (right-arrow port)
  "Return either a string containing the 'RIGHT ARROW' character, or an ASCII
replacement if PORT is not Unicode-capable."
  (let ((encoding (port-encoding port))
        (arrow "→"))
    (catch 'encoding-error
      (lambda ()
        (call-with-output-string
          (lambda (port)
            (set-port-encoding! port encoding)
            (set-port-conversion-strategy! port 'error)
            (display arrow port))))
      (lambda (key . args)
        "->"))))

(define* (tabulate rows #:key (initial-indent 0) (max-width 25)
                   (inter-column " "))
  "Return a list of strings where each string is a tabulated representation of
an element of ROWS.  All the ROWS must be lists of the same number of cells.

Add INITIAL-INDENT white space at the beginning of each row.  Ensure that
columns are at most MAX-WIDTH characters wide.  Use INTER-COLUMN as a
separator between subsequent columns."
  (define column-widths
    ;; List of column widths.
    (let loop ((rows rows)
               (widths '()))
      (match rows
        (((? null?) ...)
         (reverse widths))
        (((column rest ...) ...)
         (loop rest
               (cons (min (apply max (map string-length column))
                          max-width)
                     widths))))))

  (define indent
    (make-string initial-indent #\space))

  (define (string-pad-right* str len)
    (if (> (string-length str) len)
        str
        (string-pad-right str len)))

  (map (lambda (row)
         (string-trim-right
          (string-append indent
                         (string-join
                          (map string-pad-right* row column-widths)
                          inter-column))))
       rows))

(define* (show-manifest-transaction store manifest transaction
                                    #:key dry-run?)
  "Display what will/would be installed/removed from MANIFEST by TRANSACTION."
  (define* (package-strings names versions outputs #:key old-versions)
    (tabulate (stable-sort
               (zip (map (lambda (name output)
                           (if (string=? output "out")
                               name
                               (string-append name ":" output)))
                         names outputs)
                    (if old-versions
                        (map (lambda (old new)
                               (if (string=? old new)
                                   (G_ "(dependencies or package changed)")
                                   (string-append old " "" " new)))
                             old-versions versions)
                        versions))
               (lambda (x y)
                 (string<? (first x) (first y))))
              #:initial-indent 3))

  (define;an arrow that can be represented on stderr
    (right-arrow (current-error-port)))

  (let-values (((remove install upgrade downgrade)
                (manifest-transaction-effects manifest transaction)))
    (match remove
      ((($ <manifest-entry> name version output item) ..1)
       (let ((len    (length name))
             (remove (package-strings name version output)))
         (if dry-run?
             (format (current-error-port)
                     (N_ "The following package would be removed:~%~{~a~%~}~%"
                         "The following packages would be removed:~%~{~a~%~}~%"
                         len)
                     remove)
             (format (current-error-port)
                     (N_ "The following package will be removed:~%~{~a~%~}~%"
                         "The following packages will be removed:~%~{~a~%~}~%"
                         len)
                     remove))))
      (x #f))
    (match downgrade
      (((($ <manifest-entry> name old-version)
         . ($ <manifest-entry> _ new-version output item)) ..1)
       (let ((len       (length name))
             (downgrade (package-strings name new-version output
                                         #:old-versions old-version)))
         (if dry-run?
             (format (current-error-port)
                     (N_ "The following package would be downgraded:~%~{~a~%~}~%"
                         "The following packages would be downgraded:~%~{~a~%~}~%"
                         len)
                     downgrade)
             (format (current-error-port)
                     (N_ "The following package will be downgraded:~%~{~a~%~}~%"
                         "The following packages will be downgraded:~%~{~a~%~}~%"
                         len)
                     downgrade))))
      (x #f))
    (match upgrade
      (((($ <manifest-entry> name old-version)
         . ($ <manifest-entry> _ new-version output item)) ..1)
       (let ((len     (length name))
             (upgrade (package-strings name new-version output
                                       #:old-versions old-version)))
         (if dry-run?
             (format (current-error-port)
                     (N_ "The following package would be upgraded:~%~{~a~%~}~%"
                         "The following packages would be upgraded:~%~{~a~%~}~%"
                         len)
                     upgrade)
             (format (current-error-port)
                     (N_ "The following package will be upgraded:~%~{~a~%~}~%"
                         "The following packages will be upgraded:~%~{~a~%~}~%"
                         len)
                     upgrade))))
      (x #f))
    (match install
      ((($ <manifest-entry> name version output item _) ..1)
       (let ((len     (length name))
             (install (package-strings name version output)))
         (if dry-run?
             (format (current-error-port)
                     (N_ "The following package would be installed:~%~{~a~%~}~%"
                         "The following packages would be installed:~%~{~a~%~}~%"
                         len)
                     install)
             (format (current-error-port)
                     (N_ "The following package will be installed:~%~{~a~%~}~%"
                         "The following packages will be installed:~%~{~a~%~}~%"
                         len)
                     install))))
      (x #f))))

(define-syntax with-error-handling
  (syntax-rules ()
    "Run BODY within a user-friendly error condition handler."
    ((_ body ...)
     (call-with-error-handling
      (lambda ()
        body ...)))))

(define* (indented-string str indent
                          #:key (initial-indent? #t))
  "Return STR with each newline preceded by INDENT spaces.  When
INITIAL-INDENT? is true, the first line is also indented."
  (define indent-string
    (make-list indent #\space))

  (list->string
   (string-fold-right (lambda (chr result)
                        (if (eqv? chr #\newline)
                            (cons chr (append indent-string result))
                            (cons chr result)))
                      '()
                      (if initial-indent?
                          (string-append (list->string indent-string) str)
                          str))))

(define* (fill-paragraph str width #:optional (column 0))
  "Fill STR such that each line contains at most WIDTH characters, assuming
that the first character is at COLUMN.

When STR contains a single line break surrounded by other characters, it is
converted to a space; sequences of more than one line break are preserved."
  (define (maybe-break chr result)
    (match result
      ((column newlines chars)
       (case chr
         ((#\newline)
          `(,column ,(+ 1 newlines) ,chars))
         (else
          (let* ((spaces (if (and (pair? chars) (eqv? (car chars) #\.)) 2 1))
                 (chars  (case newlines
                           ((0) chars)
                           ((1)
                            (append (make-list spaces #\space) chars))
                           (else
                            (append (make-list newlines #\newline) chars))))
                 (column (case newlines
                           ((0) column)
                           ((1) (+ spaces column))
                           (else 0))))
            (let ((chars  (cons chr chars))
                  (column (+ 1 column)))
              (if (> column width)
                  (let*-values (((before after)
                                 (break (cut eqv? #\space <>) chars))
                                ((len)
                                 (length before)))
                    (if (<= len width)
                        `(,len
                          0
                          ,(if (null? after)
                               before
                               (append before
                                       (cons #\newline
                                             (drop-while (cut eqv? #\space <>)
                                                         after)))))
                        `(,column 0 ,chars)))     ; unbreakable
                  `(,column 0 ,chars)))))))))

  (match (string-fold maybe-break
                      `(,column 0 ())
                      str)
    ((column newlines chars)
     (list->string (reverse chars)))))

\f
;;;
;;; Packages.
;;;

(define %text-width
  ;; '*line-width*' was introduced in Guile 2.2.7/3.0.1.  On older versions of
  ;; Guile, monkey-patch 'wrap*' below.
  (if (defined? '*line-width*)
      (let ((parameter (fluid->parameter *line-width*)))
        (parameter (terminal-columns))
        parameter)
      (make-parameter (terminal-columns))))

(unless (defined? '*line-width*)                  ;Guile < 2.2.7
  (set! (@@ (texinfo plain-text) wrap*)
    ;; XXX: Monkey patch this private procedure to let 'package->recutils'
    ;; parameterize the fill of description field correctly.
    (lambda strings
      (let ((indent (fluid-ref (@@ (texinfo plain-text) *indent*))))
        (fill-string (string-concatenate strings)
                     #:line-width (%text-width) #:initial-indent indent
                     #:subsequent-indent indent)))))

(define (texi->plain-text str)
  "Return a plain-text representation of texinfo fragment STR."
  ;; 'texi-fragment->stexi' uses a string port so make sure it's a
  ;; Unicode-capable one (see <http://bugs.gnu.org/11197>.)
  (with-fluids ((%default-port-encoding "UTF-8"))
    (stexi->plain-text (texi-fragment->stexi str))))

(define (texi->plain-text* package str)
  "Same as 'texi->plain-text', but gracefully handle Texinfo errors."
  (catch 'parser-error
    (lambda ()
      (texi->plain-text str))
    (lambda args
      (warning (package-location package)
               (G_ "~a: invalid Texinfo markup~%")
               (package-full-name package))
      str)))

(define (package-field-string package field-accessor)
  "Return a plain-text representation of PACKAGE field."
  (and=> (field-accessor package)
         (lambda (str)
           (texi->plain-text* package (P_ str)))))

(define (package-description-string package)
  "Return a plain-text representation of PACKAGE description field."
  (package-field-string package package-description))

(define (package-synopsis-string package)
  "Return a plain-text representation of PACKAGE synopsis field."
  (package-field-string package package-synopsis))

(define (string->recutils str)
  "Return a version of STR where newlines have been replaced by newlines
followed by \"+ \", which makes for a valid multi-line field value in the
`recutils' syntax."
  (list->string
   (string-fold-right (lambda (chr result)
                        (if (eqv? chr #\newline)
                            (cons* chr #\+ #\space result)
                            (cons chr result)))
                      '()
                      str)))

(define* (package->recutils p port #:optional (width (%text-width))
                            #:key
                            (hyperlinks? (supports-hyperlinks? port))
                            (extra-fields '())
                            (highlighting identity))
  "Write to PORT a `recutils' record of package P, arranging to fit within
WIDTH columns.  EXTRA-FIELDS is a list of symbol/value pairs to emit.  When
HYPERLINKS? is true, emit hyperlink escape sequences when appropriate.  Pass
the synopsis and description through HIGHLIGHTING, a one-argument procedure
that may return a colorized version of its argument."
  (define port*
    (or (pager-wrapped-port port) port))

  (define width*
    ;; The available number of columns once we've taken into account space for
    ;; the initial "+ " prefix.
    (if (> width 2) (- width 2) width))

  (define (split-lines str indent)
    (string->recutils
     (fill-paragraph str width* indent)))

  (define (dependencies->recutils packages)
    (let ((list (string-join (delete-duplicates
                              (map package-full-name
                                   (sort packages package<?))) " ")))
      (split-lines list (string-length "dependencies: "))))

  (define %default-output-synopses
    `(("bin" . ,(G_ "executable programs and scripts"))
      ("debug" . ,(G_ "debug information"))
      ("doc" . ,(G_ "documentation"))
      ("lib" . ,(G_ "shared libraries"))
      ("static" . ,(G_ "static libraries"))
      ("out" . ,(G_ "everything else"))))

  (define* (output->recutils package output #:optional
                             (default-synopses %default-output-synopses))
    (string-append
     "+ " output ": "
     (or
      (any
       (match-lambda
         (('output-synopsis key synopsis)
          (and (string=? key output) (P_ synopsis)))
         (_ #f))
       (package-properties package))
      (assoc-ref default-synopses output)
      (G_ "[description missing]"))))

  (define (package-outputs/out-last package)
    ((compose append partition)
     (negate (cut string=? "out" <>))
     (package-outputs package)))

  (define (package<? p1 p2)
    (string<? (package-full-name p1) (package-full-name p2)))

  (define highlighting*
    (if (color-output? port*)
        highlighting
        identity))

  ;; Note: Don't i18n field names so that people can post-process it.
  (format port "name: ~a~%" (highlight (package-name p) port*))
  (format port "version: ~a~%" (highlight (package-version p) port*))
  (match (package-outputs/out-last p)
    (("out")                            ; one output has everything
     (format port "outputs:~%~a~%"
             (output->recutils p "out"
                               (alist-cons "out" (G_ "everything")
                                           %default-output-synopses))))
    (outputs                            ; multiple outputs
     (format port "outputs:~%~{~a~%~}"
             (map (cut output->recutils p <>) (package-outputs/out-last p)))))

  (format port "systems: ~a~%"
          (split-lines (string-join (package-transitive-supported-systems p))
                       (string-length "systems: ")))
  (format port "dependencies: ~a~%"
          (match (package-direct-inputs p)
            (((labels inputs . _) ...)
             (dependencies->recutils (filter package? inputs)))))
  (format port "location: ~a~%"
          (or (and=> (package-location p)
                     (if hyperlinks? location->hyperlink location->string))
              (G_ "unknown")))

  ;; Note: Starting from version 1.6 or recutils, hyphens are not allowed in
  ;; field identifiers.
  (format port "homepage: ~a~%" (package-home-page p))

  (format port "license: ~a~%"
          (match (package-license p)
            (((? license? licenses) ...)
             (string-join (map license-name licenses)
                          ", "))
            ((? license? license)
             (let ((text (license-name license))
                   (uri  (license-uri license)))
               (if (and hyperlinks? uri (string-prefix? "http" uri))
                   (hyperlink uri text)
                   text)))
            (x
             (G_ "unknown"))))
  (format port "synopsis: ~a~%"
          (highlighting*
           (string-map (match-lambda
                         (#\newline #\space)
                         (chr       chr))
                       (or (package-synopsis-string p) ""))))
  (format port "~a~%"
          (highlighting*
           (string->recutils
            (string-trim-right
             (parameterize ((%text-width width*))
               ;; Call 'texi->plain-text' on the concatenated string to account
               ;; for the width of "description:" in paragraph filling.
               (texi->plain-text*
                p
                (string-append "description: "
                               (or (and=> (package-description p) P_)
                                   ""))))
             #\newline))))
  (for-each (match-lambda
              ((field . value)
               (let ((field (symbol->string field)))
                 (format port "~a: ~a~%"
                         field
                         (fill-paragraph (object->string value) width*
                                         (string-length field))))))
            extra-fields)
  (newline port))

\f
;;;
;;; Searching.
;;;

(define (relevance obj regexps metrics)
  "Compute a \"relevance score\" for OBJ as a function of its number of
matches of REGEXPS and accordingly to METRICS.  METRICS is list of
field/weight pairs, where FIELD is a procedure that returns a string or list
of strings describing OBJ, and WEIGHT is a positive integer denoting the
weight of this field in the final score.

A score of zero means that OBJ does not match any of REGEXPS.  The higher the
score, the more relevant OBJ is to REGEXPS."
  (define (score regexp str)
    (fold-matches regexp str 0
                  (lambda (m score)
                    (+ score
                       (if (string=? (match:substring m) str)
                           5             ;exact match
                           1)))))

  (define (regexp->score regexp)
    (let ((score-regexp (lambda (str) (score regexp str))))
      (fold (lambda (metric relevance)
              (match metric
                ((field . weight)
                 (match (field obj)
                   (#f  relevance)
                   ((? string? str)
                    (+ relevance (* (score-regexp str) weight)))
                   ((lst ...)
                    (+ relevance (* weight (apply + (map score-regexp lst)))))))))
            0 metrics)))

  (let loop ((regexps regexps)
             (total-score 0))
    (match regexps
      ((head . tail)
       (let ((score (regexp->score head)))
         ;; Return zero if one of PATTERNS doesn't match.
         (if (zero? score)
             0
             (loop tail (+ total-score score)))))
      (() total-score))))

(define %package-metrics
  ;; Metrics used to compute the "relevance score" of a package against a set
  ;; of regexps.
  `((,package-name . 4)
    (,package-upstream-name* . 2)

    ;; Match against uncommon outputs.
    (,(lambda (package)
        (filter (lambda (output)
                  (not (member output
                               ;; Some common outputs shared by many packages.
                               '("out" "doc" "debug" "lib" "include" "bin"))))
                (package-outputs package)))
     . 1)

    ;; Match regexps on the raw Texinfo since formatting it is quite expensive
    ;; and doesn't have much of an effect on search results.
    (,(lambda (package)
        (and=> (package-synopsis package) P_)) . 3)
    (,(lambda (package)
        (and=> (package-description package) P_)) . 2)

    (,(lambda (type)
        (match (and=> (package-location type) location-file)
          ((? string? file) (basename file ".scm"))
          (#f "")))
     . 1)))

(define (package-relevance package regexps)
  "Return a score denoting the relevance of PACKAGE for REGEXPS.  A score of
zero means that PACKAGE does not match any of REGEXPS."
  (relevance package regexps %package-metrics))

(define pager-port-mapping
  ;; If a pager is being used, via 'with-paginated-output-port', this maps the
  ;; pager port (pipe) to the underlying output port.
  (make-parameter #f))

(define* (pager-wrapped-port #:optional (port (current-output-port)))
  "If PORT is a pipe to a pager created by 'with-paginated-output-port',
return the underlying port.  Otherwise return #f."
  (match (pager-port-mapping)
    ((pager . wrapped)
     (and (eq? pager port) wrapped))
    (_
     #f)))

(define (find-available-pager)
  "Return the program name of an available pager or the empty string if none is
available."
  (or (getenv "GUIX_PAGER")
      (getenv "PAGER")
      (which "less")
      (which "more")
      ""))

(define* (call-with-paginated-output-port proc
                                          #:key (less-options "FrX"))
  (let ((pager-command-line (find-available-pager)))
    ;; Setting PAGER to the empty string conventionally disables paging.
    (if (and (not (string-null? pager-command-line))
             (isatty?* (current-output-port)))
        ;; Set 'LESS' so that 'less' exits if everything fits on the screen
        ;; (F), lets ANSI escapes through (r), does not send the termcap
        ;; initialization string (X).  Set it unconditionally because some
        ;; distros set it to something that doesn't work here.
        ;;
        ;; For things that produce long lines, such as 'guix processes', use
        ;; 'R' instead of 'r': this strips hyperlinks but allows 'less' to
        ;; make a good estimate of the line length.
        (let* ((pager (with-environment-variables `(("LESS" ,less-options))
                        (apply open-pipe* OPEN_WRITE
                               ;; Split into arguments.  Treat runs of multiple
                               ;; whitespace characters as one.  libpipeline-
                               ;; style "cmd one\ arg" escaping is unsupported.
                               (remove (lambda (s) (string-null? s))
                                       (string-split pager-command-line
                                                     char-set:whitespace))))))
          (dynamic-wind
            (const #t)
            (lambda ()
              (parameterize ((pager-port-mapping
                              (cons pager (current-output-port))))
                (proc pager)))
            (lambda () (close-pipe pager))))
        (proc (current-output-port)))))

(define-syntax with-paginated-output-port
  (syntax-rules ()
    "Evaluate EXP... with PORT bound to a port that talks to the pager if
standard output is a tty, or with PORT set to the current output port."
    ((_ port exp ... #:less-options opts)
     (call-with-paginated-output-port (lambda (port) exp ...)
                                      #:less-options opts))
    ((_ port exp ...)
     (call-with-paginated-output-port (lambda (port) exp ...)))))

(define* (display-search-results matches port
                                 #:key
                                 (regexps '())
                                 (command "guix search")
                                 (print package->recutils))
  "Display MATCHES, a list of object/score pairs, by calling PRINT on each of
them.  If PORT is a terminal, print at most a full screen of results.  REGEXPS
is a list of regexps to highlight in search results."
  (define first-line
    (port-line port))

  (define max-rows
    (and first-line (isatty? port)
         (terminal-rows port)))

  (define (line-count str)
    (string-count str #\newline))

  (define highlighting
    (let ((match-color (color ON-RED BOLD)))
      (colorize-full-matches (map (lambda (regexp)
                                    (cons regexp match-color))
                                  regexps))))

  (with-paginated-output-port paginated
    (let loop ((matches matches))
      (match matches
        (((package . score) rest ...)
         (let* ((links? (supports-hyperlinks? port)))
           (print package paginated
                  #:hyperlinks? links?
                  #:extra-fields `((relevance . ,score))
                  #:highlighting highlighting)
           (loop rest)))
        (()
         #t)))))

\f
(define (string->generations str)
  "Return the list of generations matching a pattern in STR.  This function
accepts the following patterns: \"1\", \"1,2,3\", \"1..9\", \"1..\", \"..9\"."
  (define (maybe-integer)
    (let ((x (string->number str)))
      (and (integer? x)
           x)))

  (define (maybe-comma-separated-integers)
    (let ((lst (delete-duplicates
                (map string->number
                     (string-split str #\,)))))
      (and (every integer? lst)
           lst)))

  (cond ((maybe-integer)
         =>
         list)
        ((maybe-comma-separated-integers)
         =>
         identity)
        ((string-match "^([0-9]+)\\.\\.([0-9]+)$" str)
         =>
         (lambda (match)
           (let ((s (string->number (match:substring match 1)))
                 (e (string->number (match:substring match 2))))
             (and (every integer? (list s e))
                  (<= s e)
                  (iota (1+ (- e s)) s)))))
        ((string-match "^([0-9]+)\\.\\.$" str)
         =>
         (lambda (match)
           (let ((s (string->number (match:substring match 1))))
             (and (integer? s)
                  `(>= ,s)))))
        ((string-match "^\\.\\.([0-9]+)$" str)
         =>
         (lambda (match)
           (let ((e (string->number (match:substring match 1))))
             (and (integer? e)
                  `(<= ,e)))))
        (else #f)))

(define (string->duration str)
  "Return the duration matching a pattern in STR.  This function accepts the
following patterns: \"1d\", \"1w\", \"1m\"."
  (define (hours->duration hours match)
    (make-time time-duration 0
               (* 3600 hours (string->number (match:substring match 1)))))

  (cond ((string-match "^([0-9]+)s$" str)
         =>
         (lambda (match)
           (make-time time-duration 0
                      (string->number (match:substring match 1)))))
        ((string-match "^([0-9]+)h$" str)
         =>
         (lambda (match)
           (hours->duration 1 match)))
        ((string-match "^([0-9]+)d$" str)
         =>
         (lambda (match)
           (hours->duration 24 match)))
        ((string-match "^([0-9]+)w$" str)
         =>
         (lambda (match)
           (hours->duration (* 24 7) match)))
        ((string-match "^([0-9]+)m$" str)
         =>
         (lambda (match)
           (hours->duration (* 24 30) match)))
        (else #f)))

(define* (matching-generations str profile
                               #:key (duration-relation <=))
  "Return the list of available generations matching a pattern in STR.  See
'string->generations' and 'string->duration' for the list of valid patterns.
When STR is a duration pattern, return all the generations whose ctime has
DURATION-RELATION with the current time."
  (define (valid-generations lst)
    (define (valid-generation? n)
      (any (cut = n <>) (generation-numbers profile)))

    (fold-right (lambda (x acc)
                  (if (valid-generation? x)
                      (cons x acc)
                      acc))
                '()
                lst))

  (define (filter-generations generations)
    (match generations
      (() '())
      (('>= n)
       (drop-while (cut > n <>)
                   (generation-numbers profile)))
      (('<= n)
       (valid-generations (iota n 1)))
      ((lst ..1)
       (valid-generations lst))
      (x #f)))

  (define (filter-by-duration duration)
    (define (time-at-midnight time)
      ;; Return TIME at midnight by setting nanoseconds, seconds, minutes, and
      ;; hours to zeros.
      (let ((d (time-utc->date time)))
         (date->time-utc
          (make-date 0 0 0 0
                     (date-day d) (date-month d)
                     (date-year d) (date-zone-offset d)))))

    (define generation-ctime-alist
      (map (lambda (number)
             (cons number
                   (time-second
                    (time-at-midnight
                     (generation-time profile number)))))
           (generation-numbers profile)))

    (match duration
      (#f #f)
      (res
       (let ((s (time-second
                 (subtract-duration (time-at-midnight (current-time))
                                    duration))))
         (delete #f (map (lambda (x)
                           (and (duration-relation s (cdr x))
                                (first x)))
                         generation-ctime-alist))))))

  (cond ((string->generations str)
         =>
         filter-generations)
        ((string->duration str)
         =>
         filter-by-duration)
        (else
         (raise
          (formatted-message (G_ "invalid syntax: ~a~%") str)))))

(define (display-generation profile number)
  "Display a one-line summary of generation NUMBER of PROFILE."
  (unless (zero? number)
    (let* ((file   (generation-file-name profile number))
           (link   (if (supports-hyperlinks?)
                       (cut file-hyperlink file <>)
                       identity))
           (header (format #f (link (highlight (G_ "Generation ~a\t~a")
                                               (or (pager-wrapped-port)
                                                   (current-output-port))))
                           number
                           (date->string
                            (time-utc->date
                             (generation-time profile number))
                            ;; TRANSLATORS: This is a format-string for date->string.
                            ;; Please choose a format that corresponds to the
                            ;; usual way of presenting dates in your locale.
                            ;; See https://www.gnu.org/software/guile/manual/html_node/SRFI_002d19-Date-to-string.html
                            ;; for details.
                            (G_ "~b ~d ~Y ~T"))))
           (current (generation-number profile)))
      (if (= number current)
          ;; TRANSLATORS: The word "current" here is an adjective for
          ;; "Generation", as in "current generation".  Use the appropriate
          ;; gender where applicable.
          (format #t (G_ "~a\t(current)~%") header)
          (format #t "~a~%" header)))))

(define (display-profile-content-diff profile gen1 gen2)
  "Display the changed packages in PROFILE GEN2 compared to generation GEN1."

  (define (equal-entry? first second)
    (string= (manifest-entry-item first) (manifest-entry-item second)))

  (define (make-row entry prefix)
    (match entry
      (($ <manifest-entry> name version output location _)
       (list (format #f " ~a ~a" prefix name) version output location))))

  (define (list-entries number)
    (manifest-entries (profile-manifest (generation-file-name profile number))))

  (define (display-diff profile old new)
    (display-generation profile new)
    (let ((added (lset-difference
                  equal-entry? (list-entries new) (list-entries old)))
          (removed (lset-difference
                    equal-entry? (list-entries old) (list-entries new))))
      (pretty-print-table (append (map (cut make-row <> "+") added)
                                  (map (cut make-row <> "-") removed)))
      (newline)))

  (display-diff profile gen1 gen2))

(define (profile-lock-handler profile errno . _)
  "Handle failure to acquire PROFILE's lock."
  ;; NFS mounts can return ENOLCK.  When that happens, there's not much that
  ;; can be done, so warn the user and keep going.
  (if (= errno ENOLCK)
      (warning (G_ "cannot lock profile ~a: ~a~%")
               profile (strerror errno))
      (leave (G_ "profile ~a is locked by another process~%")
             profile)))

(define profile-lock-file
  (cut string-append <> ".lock"))

(define-syntax-rule (with-profile-lock profile exp ...)
  "Grab PROFILE's lock and evaluate EXP...  Call 'leave' if the lock is
already taken."
  (with-file-lock/no-wait (profile-lock-file profile)
    (cut profile-lock-handler profile <...>)
    exp ...))

(define (display-profile-content profile number)
  "Display the packages in PROFILE, generation NUMBER, in a human-readable
way."

  (define entry->row
    (match-lambda
      (($ <manifest-entry> name version output location _)
       (list (string-append "  " name) version output location))))

  (let* ((manifest (profile-manifest (generation-file-name profile number)))
         (entries  (manifest-entries manifest))
         (rows     (map entry->row entries)))
    ;; Show most recently installed packages last.
    (pretty-print-table (reverse rows))))

(define (display-generation-change previous current)
  (format #t (G_ "switched from generation ~a to ~a~%") previous current))

(define (roll-back* store profile)
  "Like 'roll-back', but display what is happening."
  (call-with-values
      (lambda ()
        (roll-back store profile))
    display-generation-change))

(define (switch-to-generation* profile number)
  "Like 'switch-to-generation', but display what is happening."
  (let ((previous (switch-to-generation profile number)))
    (display-generation-change previous number)))

(define (delete-generation* store profile generation)
  "Like 'delete-generation', but display what is going on."
  (format #t (G_ "deleting ~a~%")
          (generation-file-name profile generation))
  (delete-generation store profile generation))

(define* (package-specification->name+version+output spec
                                                     #:optional (output "out"))
  "Parse package specification SPEC and return three value: the specified
package name, version number (or #f), and output name (or OUTPUT).  SPEC may
optionally contain a version number and an output name, as in these examples:

  guile
  guile@2.0.9
  guile:debug
  guile@2.0.9:debug
"
  (let*-values (((name sub-drv)
                 (match (string-rindex spec #\:)
                   (#f    (values spec output))
                   (colon (values (substring spec 0 colon)
                                  (substring spec (+ 1 colon))))))
                ((name version)
                 (package-name->name+version name)))
    (values name version sub-drv)))

\f
;;;
;;; Command-line option processing.
;;;

(define (show-guix-usage)
  (format (current-error-port)
          (G_ "Try `guix --help' for more information.~%"))
  (exit 1))

;; Representation of a 'guix' command.
(define-immutable-record-type <command>
  (command name synopsis category)
  command?
  (name     command-name)
  (synopsis command-synopsis)
  (category command-category))

(define (source-file-command file)
  "Read FILE, a Scheme source file, and return either a <command> object based
on the 'define-command' top-level form found therein, or #f if FILE does not
contain a 'define-command' form."
  (define command-name
    (match (filter (negate string-null?)
                   (string-split file #\/))
      ((_ ... "guix" (or "scripts" "extensions") name)
       (list (file-sans-extension name)))
      ((_ ... "guix" (or "scripts" "extensions") first second)
       (list first (file-sans-extension second)))))

  ;; The strategy here is to parse FILE.  This is much cheaper than a
  ;; technique based on run-time introspection where we'd load FILE and all
  ;; the modules it depends on.
  (call-with-input-file file
    (lambda (port)
      (let loop ()
        (match (read port)
          (('define-command _ ('synopsis synopsis)
             _ ...)
           (command command-name synopsis 'main))
          (('define-command _
             ('category category) ('synopsis synopsis)
             _ ...)
           (command command-name synopsis category))
          ((? eof-object?)
           #f)
          (_
           (loop)))))))

(define* (command-files #:optional directory)
  "Return the list of source files that define Guix sub-commands."
  (define directory*
    (or directory
        (and=> (search-path %load-path "guix.scm")
               (compose (cut string-append <> "/guix/scripts")
                        dirname))))

  (define dot-scm?
    (cut string-suffix? ".scm" <>))

  (if directory*
      (map (cut string-append directory* "/" <>)
           (scandir directory* dot-scm?))
      '()))

(define (extension-directories)
  "Return the list of directories containing Guix extensions."
  (filter file-exists?
          (parse-path
           (getenv "GUIX_EXTENSIONS_PATH"))))

(define (commands)
  "Return the list of commands, alphabetically sorted."
  (filter-map source-file-command
              (append (command-files)
                      (append-map command-files
                                  (extension-directories)))))

(define (show-guix-help)
  (define (internal? command)
    (member command '("substitute" "authenticate" "offload"
                      "perform-download")))

  (define (display-commands commands)
    (let* ((names     (map (lambda (command)
                             (string-join (command-name command)))
                           commands))
           (max-width (reduce max 0 (map string-length names))))
      (for-each (lambda (name command)
                  (format #t "    ~a  ~a~%"
                          (string-pad-right name max-width)
                          (G_ (command-synopsis command))))
                names
                commands)))

  (define (category-predicate category)
    (lambda (command)
      (eq? category (command-category command))))

  (display (G_ "Usage: guix OPTION | COMMAND ARGS...
Run COMMAND with ARGS, if given.\n"))

  (display (G_ "
  -h, --help             display this helpful text again and exit"))
  (display (G_ "
  -V, --version          display version and copyright information and exit"))
  (newline)

  (newline)
  (display (G_ "COMMAND must be one of the sub-commands listed below:\n"))

  (let ((commands   (commands))
        (categories (module-ref (resolve-interface '(guix scripts))
                                '%command-categories)))
    (for-each (match-lambda
                (('internal . _)
                 #t)                              ;hide internal commands
                ((category . synopsis)
                 (let ((relevant-commands (filter (category-predicate category)
                                                  commands)))
                   ;; Only print categories that contain commands.
                   (match relevant-commands
                     ((one . more)
                      (format #t "~%  ~a~%" (G_ synopsis))
                      (display-commands relevant-commands))
                     (_ #f)))))
              categories))
  (show-bug-report-information))

(define (run-guix-command command . args)
  "Run COMMAND with the given ARGS.  Report an error when COMMAND is not
found."
  (define (command-hint guess commands)
    (define command-names
      (map (lambda (command)
             (match (command-name command)
               ((head tail ...) head)))
           commands))
    (string-closest (symbol->string guess) command-names #:threshold 3))

  (define module
    ;; Check if there is a matching extension.
    (match (search-path (extension-directories)
                        (format #f "~a.scm" command))
      (#f
       (catch 'misc-error
         (lambda ()
           (resolve-interface `(guix scripts ,command)))
         (lambda _
           (let ((hint (command-hint command (commands))))
             (format (current-error-port)
                     (G_ "guix: ~a: command not found~%") command)
             (when hint
               (display-hint (format #f (G_ "Did you mean @code{~a}?")
                                     hint)))
             (show-guix-usage)))))
      (file
       (load file)
       (resolve-interface `(guix extensions ,command)))))

  (let ((command-main (module-ref module
                                  (symbol-append 'guix- command))))
    (parameterize ((program-name command))
      (dynamic-wind
        (const #f)
        (lambda ()
          (apply command-main args))
        (lambda ()
          ;; Abuse 'exit-hook' (which is normally meant to be used by the
          ;; REPL) to run things like profiling hooks upon completion.
          (run-hook exit-hook))))))

(define (run-guix . args)
  "Run the 'guix' command defined by command line ARGS.
Unlike 'guix-main', this procedure assumes that locale, i18n support,
and signal handling have already been set up."
  (define option? (cut string-prefix? "-" <>))

  ;; The default %LOAD-EXTENSIONS includes the empty string, which doubles the
  ;; number of 'stat' calls per entry in %LOAD-PATH.  Shamelessly remove it.
  (set! %load-extensions '(".scm"))

  ;; Disable canonicalization so we don't don't stat unreasonably.
  (with-fluids ((%file-port-name-canonicalization #f))
    (match args
      (()
       (format (current-error-port)
               (G_ "guix: missing command name~%"))
       (show-guix-usage))
      ((or ("-h") ("--help"))
       (leave-on-EPIPE (show-guix-help)))
      ((or ("-V") ("--version"))
       (show-version-and-exit "guix"))
      (((? option? o) args ...)
       (format (current-error-port)
               (G_ "guix: unrecognized option '~a'~%") o)
       (show-guix-usage))
      (("help" command)
       (apply run-guix-command (string->symbol command)
              '("--help")))
      (("help" args ...)
       (leave-on-EPIPE (show-guix-help)))
      ((command args ...)
       (apply run-guix-command
              (string->symbol command)
              args)))))

(define (guix-main arg0 . args)
  (initialize-guix)
  (apply run-guix args))

;;; Local Variables:
;;; eval: (put 'guard* 'scheme-indent-function 2)
;;; End:

;;; ui.scm ends here

debug log:

solving 3bca3b1e40 ...
found 3bca3b1e40 in https://git.savannah.gnu.org/cgit/guix.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/guix.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.