[bug#68015] [PATCH] gnu: guile-xyz: Add guile-srfi-171.

[lgcoelho--- via Guix-patches via <guix-patches@gnu.org>]

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This patch adds the SRFI-171, which supplies transducer functionality, 
in (gnu packages guile-xyz).

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From 0e6f08bb1e53fc4d531cb4f1e0f7d1cdc0cd216e Mon Sep 17 00:00:00 2001
From: Luis Guilherme Coelho <lgcoelho@disroot.org>
Date: Sun, 24 Dec 2023 16:13:35 -0300
Subject: [PATCH] gnu: guile-xyz: Add guile-srfi-171.

---
 gnu/packages/guile-xyz.scm | 66 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/gnu/packages/guile-xyz.scm b/gnu/packages/guile-xyz.scm
index 7b44dc3167..f22a9d995e 100644
--- a/gnu/packages/guile-xyz.scm
+++ b/gnu/packages/guile-xyz.scm
@@ -47,6 +47,7 @@
 ;;; Copyright © 2022 Evgeny Pisemsky <evgeny@pisemsky.com>
 ;;; Copyright © 2022 jgart <jgart@dismail.de>
 ;;; Copyright © 2023 Andrew Tropin <andrew@trop.in>
+;;; Copyright © 2023 Luis Guilherme Coelho <lgcoelho@disroot.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -3683,6 +3684,71 @@ (define-public guile-srfi-159
 more expressive and flexible than the traditional @code{format} procedure.")
       (license license:bsd-3))))
 
+(define-public guile-srfi-171
+  (let ((commit "40eb284ae54e510013054453890052df603a3a7f")
+        (revision "0"))
+    (package
+      (name "guile-srfi-171")
+      (version (git-version "0.0.0" revision commit))
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                      (url (string-append
+                             "https://github.com"
+                             "/scheme-requests-for-implementation/srfi-171"))
+                      (commit commit)))
+                (file-name (git-file-name name version))
+                (sha256
+                 (base32
+                  "1w2x5mwvzb2xrp6j2drigay885ni5dag8y2iiak4s96v863wyh5l"))
+                (snippet #~(begin
+                             (use-modules (ice-9 rdelim)
+                                          (ice-9 pretty-print)
+                                          (guix build utils))
+                             (with-output-to-file "tmp.scm"
+                               (lambda ()
+                                 (call-with-input-file "srfi/srfi-171.scm"
+                                   (lambda (input-port)
+                                     (let loop
+                                       ((i 0))
+                                       (let ((line (read-line input-port)))
+                                         (unless (equal? line
+                                                  "(include \"171-impl.scm\")")
+                                           (unless (< i 13)
+                                             (write-line line))
+                                           (loop (1+ i)))))))
+                                 (call-with-input-file "srfi/171-impl.scm"
+                                   (lambda (input-port)
+                                     (let loop
+                                       ((i 0))
+                                       (let ((line (read-line input-port)))
+                                         (unless (eof-object? line)
+                                           (unless (< i 13)
+                                             (write-line line))
+                                           (loop (1+ i)))))))))
+                             (delete-file-recursively "srfi")
+                             (mkdir "srfi")
+                             (rename-file "tmp.scm" "srfi/srfi-171.scm")
+                             (for-each delete-file
+                                       '("compose.scm" "srfi-171.html"
+                                         "transducers.md"
+                                         "README.org"
+                                         "index.html"
+                                         "tests-guile.scm"
+                                         "tests-r7rs.scm"
+                                         "tests.scm"))))))
+      (build-system guile-build-system)
+      (inputs (list guile-3.0))
+      (home-page
+       "https://github.com/scheme-requests-for-implementation/srfi-171")
+      (synopsis "SRFI 171 transducers implementation for Guile")
+      (description
+       "This package provides an implementation of SRFI 171 for Guile.
+SRFI 171 defines transducers that generalize common list operations like
+map, filter, take and so on for other types. The traditional Scheme
+approach of having collection-specific procedures is not changed.")
+      (license license:expat))))
+
 (define-public guile-srfi-180
   (let ((commit "9188bf9724c6d320ef804579d222e855b007b193")
         (revision "0"))
-- 
2.41.0