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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015 Mathieu Lirzin <mthl@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 scripts)
#: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 $VISUAL or $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
;; XXX: It would be better to default to something more likely to be
;; pre-installed on an average GNU system. Since Nano is not suited for
;; editing Scheme, Emacs is used instead.
(make-parameter (or (getenv "VISUAL") (getenv "EDITOR") "emacs")))
(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 (package->location-specification package)
"Return the location specification for PACKAGE for a typical editor command
line."
(let ((loc (package-location package)))
(list (string-append "+"
(number->string
(location-line loc)))
(search-path* %load-path (location-file loc)))))
(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)
(catch 'system-error
(lambda ()
(let ((file-names (append-map package->location-specification
packages)))
;; Use `system' instead of `exec' in order to sanely handle
;; possible command line arguments in %EDITOR.
(exit (system (string-join (cons (%editor) file-names))))))
(lambda args
(let ((errno (system-error-errno args)))
(leave (_ "failed to launch '~a': ~a~%")
(%editor) (strerror errno))))))))
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