Add 'guix edit'.

* guix/scripts/edit.scm: New file.
* Makefile.am (MODULES): Add it.
* doc.am (SUBCOMMANDS): Add 'edit'.
* doc/guix.texi (Defining Packages): Add xref to "Invoking guix edit".
  (Invoking guix edit): New node.
* po/guix/POTFILES.in: Add it.

1 files changed, 79 insertions, 0 deletions

diff --git a/guix/scripts/edit.scm b/guix/scripts/edit.scm
new file mode 100644
index 0000000000..fc453ac38d
--- /dev/null
+++ b/guix/scripts/edit.scm
@@ -0,0 +1,79 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.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 (guix scripts edit)
+  #:use-module (guix ui)
+  #:use-module (guix utils)
+  #:use-module (guix packages)
+  #:use-module (gnu packages)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-37)
+  #:export (%editor
+            guix-edit))
+
+(define %options
+  (list (option '(#\h "help") #f #f
+                (lambda args
+                  (show-help)
+                  (exit 0)))
+        (option '(#\V "version") #f #f
+                (lambda args
+                  (show-version-and-exit "guix edit")))))
+
+(define (show-help)
+  (display (_ "Usage: guix edit PACKAGE...
+Start $EDITOR to edit the definitions of PACKAGE...\n"))
+  (newline)
+  (display (_ "
+  -h, --help             display this help and exit"))
+  (display (_ "
+  -V, --version          display version information and exit"))
+  (newline)
+  (show-bug-report-information))
+
+(define %editor
+  (make-parameter (or (getenv "EDITOR") "emacsclient")))
+
+(define (search-path* path file)
+  "Like 'search-path' but exit if FILE is not found."
+  (let ((absolute-file-name (search-path path file)))
+    (unless absolute-file-name
+      ;; Shouldn't happen unless somebody fiddled with the 'location' field.
+      (leave (_ "file '~a' not found in search path ~s~%")
+             file path))
+    absolute-file-name))
+
+
+(define (guix-edit . args)
+  (with-error-handling
+    (let* ((specs    (parse-command-line args %options '(())
+                                         #:argument-handler cons))
+           (packages (map specification->package specs)))
+      (for-each (lambda (package)
+                  (unless (package-location package)
+                    (leave (_ "source location of package '~a' is unknown~%")
+                           (package-full-name package))))
+                packages)
+      (apply execlp (%editor) (%editor)
+             (append-map (lambda (package)
+                           (let ((loc (package-location package)))
+                             (list (string-append "+"
+                                                  (number->string
+                                                   (location-line loc)))
+                                   (search-path* %load-path (location-file loc)))))
+                         packages)))))