Subject: [bug#37322] [PATCH v2 1/2] added versoining to crate import

From: Martin Becze <[email-masked]>
Date: Mon, 9 Sep 2019 11:36:04 -0400

---
 guix/import/crate.scm         | 12 +++++++++---
 guix/scripts/import/crate.scm | 10 +++++++++-
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/guix/import/crate.scm b/guix/import/crate.scm
index f6057dbf8b..de56432e3c 100644
--- a/guix/import/crate.scm
+++ b/guix/import/crate.scm
@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2016 David Craven <[email-masked]>
 ;;; Copyright © 2019 Ludovic Courtès <[email-masked]>
+;;; Copyright © 2019 Martin Becze <[email-masked]>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -181,8 +182,8 @@ and LICENSE."
   ;; This regexp matches that.
   (make-regexp "^(.*) OR (.*)$"))
 
-(define (crate->guix-package crate-name)
-  "Fetch the metadata for CRATE-NAME from crates.io, and return the
+(define (crate->guix-package crate-name version)
+  "Fetch the metadata for CRATE-NAME@VERSION from crates.io, and return the
 `package' s-expression corresponding to that package, or #f on failure."
   (define (string->license string)
     (match (regexp-exec %dual-license-rx string)
@@ -196,10 +197,15 @@ and LICENSE."
   (define crate
     (lookup-crate crate-name))
 
+  (define crate-version-string
+      (if version
+        version
+        (crate-latest-version crate)))
+
   (and crate
        (let* ((version        (find (lambda (version)
                                       (string=? (crate-version-number version)
-                                                (crate-latest-version crate)))
+                                                crate-version-string))
                                     (crate-versions crate)))
               (dependencies   (crate-version-dependencies version))
               (dep-crates     (filter normal-dependency? dependencies))
diff --git a/guix/scripts/import/crate.scm b/guix/scripts/import/crate.scm
index cab9a4397b..948b90ec15 100644
--- a/guix/scripts/import/crate.scm
+++ b/guix/scripts/import/crate.scm
@@ -2,6 +2,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2014 David Thompson <[email-masked]>
 ;;; Copyright © 2016 David Craven <[email-masked]>
+;;; Copyright © 2019 Martin Becze <[email-masked]>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -66,6 +67,7 @@ Import and convert the crate.io package for PACKAGE-NAME.\n"))
 ;;;
 
 (define (guix-import-crate . args)
+
   (define (parse-options)
     ;; Return the alist of option values.
     (args-fold* args %options
@@ -75,6 +77,7 @@ Import and convert the crate.io package for PACKAGE-NAME.\n"))
                   (alist-cons 'argument arg result))
                 %default-options))
 
+
   (let* ((opts (parse-options))
          (args (filter-map (match-lambda
                             (('argument . value)
@@ -83,7 +86,12 @@ Import and convert the crate.io package for PACKAGE-NAME.\n"))
                            (reverse opts))))
     (match args
       ((package-name)
-       (let ((sexp (crate->guix-package package-name)))
+       (define-values (name version)
+            (match (string-split package-name #\@)
+            ((name version) (values name version))
+            ((name) (values name #f))))
+ 
+       (let ((sexp (crate->guix-package name version)))
          (unless sexp
            (leave (G_ "failed to download meta-data for package '~a'~%")
                   package-name))
-- 
2.23.0