;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013, 2014, 2015, 2016 Andreas Enge <andreas@enge.fr>
;;; Copyright © 2014, 2015 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2014, 2017 Eric Bavier <bavier@member.fsf.org>
;;; Copyright © 2014, 2015 Federico Beffa <beffa@fbengineering.ch>
;;; Copyright © 2015 Omar Radwan <toxemicsquire4@gmail.com>
;;; Copyright © 2015 Pierre-Antoine Rault <par@rigelk.eu>
;;; Copyright © 2015, 2016, 2017, 2018, 2019 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2015, 2016 Christopher Allan Webber <cwebber@dustycloud.org>
;;; Copyright © 2015 Eric Dvorsak <eric@dvorsak.fr>
;;; Copyright © 2015, 2016 David Thompson <davet@gnu.org>
;;; Copyright © 2015, 2016, 2017 Leo Famulari <leo@famulari.name>
;;; Copyright © 2015, 2017 Ben Woodcroft <donttrustben@gmail.com>
;;; Copyright © 2015, 2016 Erik Edrosa <erik.edrosa@gmail.com>
;;; Copyright © 2015, 2016, 2017, 2018, 2019 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2015, 2017 Kyle Meyer <kyle@kyleam.com>
;;; Copyright © 2015, 2016 Chris Marusich <cmmarusich@gmail.com>
;;; Copyright © 2016 Danny Milosavljevic <dannym+a@scratchpost.org>
;;; Copyright © 2016 Lukas Gradl <lgradl@openmailbox.org>
;;; Copyright © 2016, 2018 Hartmut Goebel <h.goebel@crazy-compilers.com>
;;; Copyright © 2016 Daniel Pimentel <d4n1@d4n1.org>
;;; Copyright © 2016 Sou Bunnbu <iyzsong@gmail.com>
;;; Copyright © 2016, 2017 Troy Sankey <sankeytms@gmail.com>
;;; Copyright © 2016, 2017 Nils Gillmann <ng0@n0.is>
;;; Copyright © 2016 Dylan Jeffers <sapientech@sapientech@openmailbox.org>
;;; Copyright © 2016 David Craven <david@craven.ch>
;;; Copyright © 2016, 2017, 2018 Marius Bakke <mbakke@fastmail.com>
;;; Copyright © 2016, 2017 Stefan Reichör <stefan@xsteve.at>
;;; Copyright © 2016 Dylan Jeffers <sapientech@sapientech@openmailbox.org>
;;; Copyright © 2016, 2017 Alex Vong <alexvong1995@gmail.com>
;;; Copyright © 2016, 2017, 2018 Arun Isaac <arunisaac@systemreboot.net>
;;; Copyright © 2016, 2017, 2018 Julien Lepiller <julien@lepiller.eu>
;;; Copyright © 2016, 2017, 2018 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2016, 2017 Thomas Danckaert <post@thomasdanckaert.be>
;;; Copyright © 2017 Carlo Zancanaro <carlo@zancanaro.id.au>
;;; Copyright © 2017 Frederick M. Muriithi <fredmanglis@gmail.com>
;;; Copyright © 2017, 2018 Adriano Peluso <catonano@gmail.com>
;;; Copyright © 2017 Ben Sturmfels <ben@sturm.com.au>
;;; Copyright © 2017, 2018 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2017 José Miguel Sánchez García <jmi2k@openmailbox.org>
;;; Copyright © 2017 Roel Janssen <roel@gnu.org>
;;; Copyright © 2017, 2018 Kei Kebreau <kkebreau@posteo.net>
;;; Copyright © 2017 Rutger Helling <rhelling@mykolab.com>
;;; Copyright © 2017 Muriithi Frederick Muriuki <fredmanglis@gmail.com>
;;; Copyright © 2017 Brendan Tildesley <brendan.tildesley@openmailbox.org>
;;; Copyright © 2018 Ethan R. Jones <ethanrjones97@gmail.com
;;; Copyright © 2018 Fis Trivial <ybbs.daans@hotmail.com>
;;; Copyright © 2018 Vijayalakshmi Vedantham <vijimay12@gmail.com>
;;; Copyright © 2018 Mathieu Lirzin <mthl@gnu.org>
;;; Copyright © 2018 Adam Massmann <massmannak@gmail.com>
;;; Copyright © 2016, 2018 Tomáš Čech <sleep_walker@gnu.org>
;;; Copyright © 2018 Nicolas Goaziou <mail@nicolasgoaziou.fr>
;;; Copyright © 2018 Oleg Pykhalov <go.wigust@gmail.com>
;;; Copyright © 2018 Clément Lassieur <clement@lassieur.org>
;;; Copyright © 2018 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;; Copyright © 2018 Luther Thompson <lutheroto@gmail.com>
;;; Copyright © 2018 Vagrant Cascadian <vagrant@debian.org>
;;;
;;; 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 (gnu packages python)
  #:use-module ((guix licenses) #:prefix license:)
  #:use-module (gnu packages)
  #:use-module (gnu packages base)
  #:use-module (gnu packages bash)
  #:use-module (gnu packages compression)
  #:use-module (gnu packages dbm)
  #:use-module (gnu packages libffi)
  #:use-module (gnu packages pkg-config)
  #:use-module (gnu packages readline)
  #:use-module (gnu packages sqlite)
  #:use-module (gnu packages tcl)
  #:use-module (gnu packages tls)
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix utils)
  #:use-module (guix build-system gnu)
  #:use-module (guix build-system trivial))

(define-public python-2.7
  (package
    (name "python2")
    (version "2.7.15")
    (replacement python-2/fixed)
    (source
     (origin
      (method url-fetch)
      (uri (string-append "https://www.python.org/ftp/python/"
                          version "/Python-" version ".tar.xz"))
      (sha256
       (base32
        "0x2mvz9dp11wj7p5ccvmk9s0hzjk2fa1m462p395l4r6bfnb3n92"))
      (patches (search-patches "python-2.7-search-paths.patch"
                               "python-2-deterministic-build-info.patch"
                               "python-2.7-source-date-epoch.patch"
                               "python-2.7-adjust-tests.patch"))
      (modules '((guix build utils)))
      ;; suboptimal to delete failing tests here, but if we delete them in the
      ;; arguments then we need to make sure to strip out that phase when it
      ;; gets inherited by python and python-minimal.
      (snippet
       '(begin
          (for-each delete-file
                    '("Lib/test/test_compileall.py"
                      "Lib/test/test_ctypes.py" ; fails on mips64el
                      "Lib/test/test_distutils.py"
                      "Lib/test/test_import.py"
                      "Lib/test/test_shutil.py"
                      "Lib/test/test_socket.py"
                      "Lib/test/test_subprocess.py"))
          #t))))
    (outputs '("out"
               "tk"))                     ;tkinter; adds 50 MiB to the closure
    (build-system gnu-build-system)
    (arguments
     `(#:test-target "test"
       #:configure-flags
       (list "--enable-shared"                    ;allow embedding
             "--with-system-ffi"                  ;build ctypes
             "--with-ensurepip=install"           ;install pip and setuptools
             "--enable-unicode=ucs4"
             (string-append "LDFLAGS=-Wl,-rpath="
                            (assoc-ref %outputs "out") "/lib"))

        #:modules ((ice-9 ftw) (ice-9 match)
                   (guix build utils) (guix build gnu-build-system)
                   (guix config))
        #:imported-modules ,(cons '(guix config)
                                    %gnu-build-system-modules)
        #:phases
        (modify-phases %standard-phases
          (add-before
           'configure 'patch-lib-shells
           (lambda _
             ;; Filter for existing files, since some may not exist in all
             ;; versions of python that are built with this recipe.
             (substitute* (filter file-exists?
                                  '("Lib/subprocess.py"
                                    "Lib/popen2.py"
                                    "Lib/distutils/tests/test_spawn.py"
                                    "Lib/test/support/__init__.py"
                                    "Lib/test/test_subprocess.py"))
               (("/bin/sh") (which "sh")))
             #t))
          (add-before 'configure 'do-not-record-configure-flags
            (lambda* (#:key configure-flags #:allow-other-keys)
              ;; Remove configure flags from the installed '_sysconfigdata.py'
              ;; and 'Makefile' so we don't end up keeping references to the
              ;; build tools.
              ;;
              ;; Preserve at least '--with-system-ffi' since otherwise the
              ;; thing tries to build libffi, fails, and we end up with a
              ;; Python that lacks ctypes.
              (substitute* "configure"
                (("^CONFIG_ARGS=.*$")
                 (format #f "CONFIG_ARGS='~a'\n"
                         (if (member "--with-system-ffi" configure-flags)
                             "--with-system-ffi"
                             ""))))
              #t))
          (add-before
           'check 'pre-check
           (lambda _
             ;; 'Lib/test/test_site.py' needs a valid $HOME
             (setenv "HOME" (getcwd))
             #t))
          (add-after
           'unpack 'set-source-file-times-to-1980
           ;; XXX One of the tests uses a ZIP library to pack up some of the
           ;; source tree, and fails with "ZIP does not support timestamps
           ;; before 1980".  Work around this by setting the file times in the
           ;; source tree to sometime in early 1980.
           (lambda _
             (let ((circa-1980 (* 10 366 24 60 60)))
               (ftw "." (lambda (file stat flag)
                          (utime file circa-1980 circa-1980)
                          #t))
               #t)))
          (add-after 'unpack 'apply-templated-patch
           (lambda* (#:key inputs #:allow-other-keys)
             (let ((patch-template (assoc-ref inputs "site-patch"))
                   (patch "python-2.7-site-prefixes.patch"))
               ;; generate actual patch
               (copy-file patch-template patch)
               (substitute* patch
                 (("@storedir@")
                  %store-directory))
               ;; apply it (taken from (guix packages))
               (invoke (string-append (assoc-ref inputs "patch") "/bin/patch")
                       "--force" "--no-backup-if-mismatch"
                       "-p1" "--input" patch))))
          (add-after 'install 'remove-tests
            ;; Remove 25 MiB of unneeded unit tests.  Keep test_support.*
            ;; because these files are used by some libraries out there.
            (lambda* (#:key outputs #:allow-other-keys)
              (let ((out (assoc-ref outputs "out")))
                (match (scandir (string-append out "/lib")
                                (lambda (name)
                                  (string-prefix? "python" name)))
                  ((pythonX.Y)
                   (let ((testdir (string-append out "/lib/" pythonX.Y
                                                 "/test")))
                     (with-directory-excursion testdir
                       (for-each delete-file-recursively
                                 (scandir testdir
                                          (match-lambda
                                            ((or "." "..") #f)
                                            (file
                                             (not
                                              ;; FIXME: Add the 'support' directory
                                              ;; in the next rebuild cycle, since it
                                              ;; moved in 2.7.14.  See also
                                              ;; python2-futures below.
                                              (string-prefix? "test_support."
                                                              file))))))
                       (call-with-output-file "__init__.py" (const #t))
                       #t)))))))
          (add-after 'install 'move-tk-inter
            (lambda* (#:key outputs #:allow-other-keys)
              ;; When Tkinter support is built move it to a separate output so
              ;; that the main output doesn't contain a reference to Tcl/Tk.
              (let ((out (assoc-ref outputs "out"))
                    (tk  (assoc-ref outputs "tk")))
                (when tk
                  (match (find-files out "tkinter.*\\.so")
                    ((tkinter.so)
                     ;; The .so is in OUT/lib/pythonX.Y/lib-dynload, but we
                     ;; want it under TK/lib/pythonX.Y/site-packages.
                     (let* ((len    (string-length out))
                            (target (string-append
                                     tk "/"
                                     (string-drop
                                      (dirname (dirname tkinter.so))
                                      len)
                                     "/site-packages")))
                       (install-file tkinter.so target)
                       (delete-file tkinter.so)))))
                #t))))))
    (inputs
     `(("bzip2" ,bzip2)
       ("gdbm" ,gdbm)
       ("libffi" ,libffi)                         ; for ctypes
       ("sqlite" ,sqlite)                         ; for sqlite extension
       ("openssl" ,openssl)
       ("readline" ,readline)
       ("zlib" ,zlib)
       ("tcl" ,tcl)
       ("tk" ,tk)                                 ; for tkinter
       ("site-patch" ,(search-patch "python-2.7-site-prefixes.patch.in"))
       ("patch" ,patch)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (native-search-paths
     (list (search-path-specification
            (variable "PYTHONPATH")
            (files '("lib/python2.7/site-packages")))))
    (home-page "https://www.python.org")
    (synopsis "High-level, dynamically-typed programming language")
    (description
     "Python is a remarkably powerful dynamic programming language that
is used in a wide variety of application domains.  Some of its key
distinguishing features include: clear, readable syntax; strong
introspection capabilities; intuitive object orientation; natural
expression of procedural code; full modularity, supporting hierarchical
packages; exception-based error handling; and very high level dynamic
data types.")
    (license license:psfl)))

;; Current 2.x version.
(define-public python-2 python-2.7)

(define python-2/fixed
  (package
    (inherit python-2)
    (source (origin
              (inherit (package-source python-2))
              (patches (append
                        (origin-patches (package-source python-2))
                        (search-patches "python2-CVE-2018-14647.patch"
                                        "python2-CVE-2018-1000802.patch")))))))

(define-public python2-called-python
  ;; Both 2.x and 3.x used to be called "python".  In commit
  ;; a7714d42de2c3082f3609d1e63c83d703fb39cf9 (March 2018), we renamed the
  ;; Python 2.x package to "python2".
  (package
    (inherit python-2)
    (name "python")
    (properties `((superseded . ,python-2)))))

(define-public python-3.7
  (package (inherit python-2)
    (name "python")
    (version "3.7.0")
    (replacement python-3/fixed)
    (source (origin
              (method url-fetch)
              (uri (string-append "https://www.python.org/ftp/python/"
                                  version "/Python-" version ".tar.xz"))
              (patches (search-patches
                        "python-fix-tests.patch"
                        "python-3-fix-tests.patch"
                        "python-3-deterministic-build-info.patch"
                        "python-3-search-paths.patch"))
              (patch-flags '("-p0"))
              (sha256
               (base32
                "0j9mic5c9lbd2b20wka7hily7szz740wy9ilfrczxap63rnrk0h3"))
              (snippet
               '(begin
                  (for-each delete-file
                            '(;; This test may hang and eventually run out of
                              ;; memory on some systems:
                              ;; <https://bugs.python.org/issue34587>
                              "Lib/test/test_socket.py"

                              ;; These tests fail on AArch64.
                              "Lib/ctypes/test/test_win32.py"
                              "Lib/test/test_fcntl.py"
                              "Lib/test/test_posix.py"))
                  #t))))
    (arguments
     (substitute-keyword-arguments (package-arguments python-2)
       ((#:phases phases)
       `(modify-phases ,phases
          (delete 'apply-templated-patch)
          ;; Unset SOURCE_DATE_EPOCH while running the test-suite and set it
          ;; again afterwards.  See <https://bugs.python.org/issue34022>.
          (add-before 'check 'unset-SOURCE_DATE_EPOCH
            (lambda _ (unsetenv "SOURCE_DATE_EPOCH") #t))
          (add-after 'check 'reset-SOURCE_DATE_EPOCH
            (lambda _ (setenv "SOURCE_DATE_EPOCH" "1") #t))
           ;; FIXME: Without this phase we have close to 400 files that
           ;; differ across different builds of this package.  With this phase
           ;; there are 44 files left that differ.
           (add-after 'remove-tests 'rebuild-bytecode
             (lambda* (#:key outputs #:allow-other-keys)
               (let ((out (assoc-ref outputs "out")))
                 ;; Disable hash randomization to ensure the generated .pycs
                 ;; are reproducible.
                 (setenv "PYTHONHASHSEED" "0")
                 (for-each
                  (lambda (opt)
                    (format #t "Compiling with optimization level: ~a\n"
                            (if (null? opt) "none" (car opt)))
                    (for-each (lambda (file)
                                (apply invoke
                                       `(,(string-append out "/bin/python3")
                                         ,@opt
                                         "-m" "compileall"
                                         "-f" ; force rebuild
                                         ;; Don't build lib2to3, because it's Python 2 code.
                                         "-x" "lib2to3/.*"
                                         ,file)))
                              (find-files out "\\.py$")))
                  (list '() '("-O") '("-OO")))
                 #t)))))))
    (native-search-paths
     (list (search-path-specification
            (variable "PYTHONPATH")
            (files (list (string-append "lib/python"
                                        (version-major+minor version)
                                        "/site-packages"))))))))

;; Current 3.x version.
(define-public python-3 python-3.7)

(define python-3/fixed
  (package
    (inherit python-3)
    (source (origin
              (inherit (package-source python-3))
              (patches (append (origin-patches (package-source python-3))
                               (search-patches "python-CVE-2018-14647.patch")))))))

;; Current major version.
(define-public python python-3)

;; Minimal variants of Python, mostly used to break the cycle between Tk and
;; Python (Tk -> libxcb -> Python.)

(define-public python2-minimal
  (package/inherit python-2
    (name "python2-minimal")
    (outputs '("out"))

    ;; Keep zlib, which is used by 'pip' (via the 'zipimport' module), which
    ;; is invoked upon 'make install'.  'pip' also expects 'ctypes' and thus
    ;; libffi.
    (inputs `(("libffi" ,libffi)
              ("zlib" ,zlib)
              ("site-patch" ,(search-patch "python-2.7-site-prefixes.patch.in"))
              ("patch" ,patch)))))

(define-public python-minimal
  (package/inherit python
    (name "python-minimal")
    (outputs '("out"))

    ;; Build fails due to missing ctypes without libffi.
    ;; OpenSSL is a mandatory dependency of Python 3.x, for urllib;
    ;; zlib is required by 'zipimport', used by pip.
    (inputs `(("libffi" ,libffi)
              ("openssl" ,openssl)
              ("zlib" ,zlib)))))

(define-public python-debug
  (package/inherit python
    (name "python-debug")
    (outputs '("out" "debug"))
    (build-system gnu-build-system)
    (arguments
     (substitute-keyword-arguments (package-arguments python)
       ((#:configure-flags flags '())
        `(cons "--with-pydebug" ,flags))))
    (synopsis
     "High-level, dynamically-typed programming language (for debugging)")
    (description
     "This variant of Python provides an interpreter built with
@code{--with-pydebug} to help develop and debug extensions.  See
@url{https://pythonextensionpatterns.readthedocs.io/en/latest/debugging/debug.html},
for more information.")))

(define* (wrap-python3 python
                       #:optional
                       (name (string-append (package-name python) "-wrapper")))
  (package/inherit python
    (name name)
    (source #f)
    (build-system trivial-build-system)
    (outputs '("out"))
    (inputs `(("bash" ,bash)))
    (propagated-inputs `(("python" ,python)))
    (arguments
     `(#:modules ((guix build utils))
       #:builder
         (begin
           (use-modules (guix build utils))
           (let ((bin (string-append (assoc-ref %outputs "out") "/bin"))
                 (python (string-append (assoc-ref %build-inputs "python") "/bin/")))
                (mkdir-p bin)
                (for-each
                  (lambda (old new)
                    (symlink (string-append python old)
                             (string-append bin "/" new)))
                  `("python3" ,"pydoc3" ,"idle3" ,"pip3")
                  `("python"  ,"pydoc"  ,"idle"  ,"pip"))
                ;; python-config outputs search paths based upon its location,
                ;; use a bash wrapper to avoid changing its outputs.
                (let ((bash (string-append (assoc-ref %build-inputs "bash")
                                           "/bin/bash"))
                      (old  (string-append python "python3-config"))
                      (new  (string-append bin "/python-config")))
                  (with-output-to-file new
                    (lambda ()
                      (format #t "#!~a~%" bash)
                      (format #t "exec \"~a\" \"$@\"~%" old)
                      (chmod new #o755)
                      #t)))))))
    (synopsis "Wrapper for the Python 3 commands")
    (description
     "This package provides wrappers for the commands of Python@tie{}3.x such
that they can be invoked under their usual name---e.g., @command{python}
instead of @command{python3}.")))

(define-public python-wrapper (wrap-python3 python))
(define-public python-minimal-wrapper (wrap-python3 python-minimal))