guix: import: Add composer importer.

* guix/import/composer.scm: New file.
* guix/scripts/import/composer.scm: New file.
* guix/tests/composer.scm: New file.
* Makefile.am: Add them.
* guix/scripts/import.scm: Add composer importer.
* doc/guix.texi (Invoking guix import): Mention it.

Change-Id: I44a89b8cc80ef5b4a3cd15e8fbba4a18c1cea0b1

Co-authored-by: Julien Lepiller <julien@lepiller.eu>
Co-authored-by: Ludovic Courtès <ludo@gnu.org>

2 files changed, 108 insertions, 1 deletions

diff --git a/guix/scripts/import.scm b/guix/scripts/import.scm
index 1e8ffd25ec..d2a1cee56e 100644
--- a/guix/scripts/import.scm
+++ b/guix/scripts/import.scm
@@ -47,7 +47,7 @@
 
 (define importers '("gnu" "pypi" "cpan" "hackage" "stackage" "egg" "elpa"
                     "gem" "go" "cran" "crate" "texlive" "json" "opam"
-                    "minetest" "elm" "hexpm"))
+                    "minetest" "elm" "hexpm" "composer"))
 
 (define (resolve-importer name)
   (let ((module (resolve-interface
diff --git a/guix/scripts/import/composer.scm b/guix/scripts/import/composer.scm
new file mode 100644
index 0000000000..412bae6318
--- /dev/null
+++ b/guix/scripts/import/composer.scm
@@ -0,0 +1,107 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 David Thompson <davet@gnu.org>
+;;; Copyright © 2018 Oleg Pykhalov <go.wigust@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 scripts import composer)
+  #:use-module (guix ui)
+  #:use-module (guix utils)
+  #:use-module (guix scripts)
+  #:use-module (guix import composer)
+  #:use-module (guix scripts import)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-11)
+  #:use-module (srfi srfi-37)
+  #:use-module (srfi srfi-41)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 format)
+  #:export (guix-import-composer))
+
+
+;;;
+;;; Command-line options.
+;;;
+
+(define %default-options
+  '())
+
+(define (show-help)
+  (display (G_ "Usage: guix import composer PACKAGE-NAME
+Import and convert the Composer package for PACKAGE-NAME.\n"))
+  (display (G_ "
+  -h, --help             display this help and exit"))
+  (display (G_ "
+  -V, --version          display version information and exit"))
+  (display (G_ "
+  -r, --recursive        generate package expressions for all Composer packages\
+ that are not yet in Guix"))
+  (newline)
+  (show-bug-report-information))
+
+(define %options
+  ;; Specification of the command-line options.
+  (cons* (option '(#\h "help") #f #f
+                 (lambda args
+                   (show-help)
+                   (exit 0)))
+         (option '(#\V "version") #f #f
+                 (lambda args
+                   (show-version-and-exit "guix import composer")))
+         (option '(#\r "recursive") #f #f
+                 (lambda (opt name arg result)
+                   (alist-cons 'recursive #t result)))
+         %standard-import-options))
+
+
+;;;
+;;; Entry point.
+;;;
+
+(define (guix-import-composer . args)
+  (define (parse-options)
+    ;; Return the alist of option values.
+    (args-fold* args %options
+                (lambda (opt name arg result)
+                  (leave (G_ "~A: unrecognized option~%") name))
+                (lambda (arg result)
+                  (alist-cons 'argument arg result))
+                %default-options))
+
+  (let* ((opts (parse-options))
+         (args (filter-map (match-lambda
+                            (('argument . value)
+                             value)
+                            (_ #f))
+                           (reverse opts))))
+    (match args
+      ((package-name)
+       (if (assoc-ref opts 'recursive)
+           (map (match-lambda
+                  ((and ('package ('name name) . rest) pkg)
+                   `(define-public ,(string->symbol name)
+                      ,pkg))
+                  (_ #f))
+                (composer-recursive-import package-name))
+           (let ((sexp (composer->guix-package package-name)))
+             (unless sexp
+               (leave (G_ "failed to download meta-data for package '~a'~%")
+                      package-name))
+             sexp)))
+      (()
+       (leave (G_ "too few arguments~%")))
+      ((many ...)
+       (leave (G_ "too many arguments~%"))))))