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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015, 2016, 2019 Ludovic Courtès <>
;;; Copyright © 2015 Mathieu Lirzin <>
;;; 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
;;; 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 <>.
(define-module (guix scripts edit)
#:use-module (guix ui)
#:use-module (guix scripts)
#:use-module (guix utils)
#:use-module (gnu packages)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-37)
#:export (%editor
(define %options
(list (option '(#\h "help") #f #f
(lambda args
(exit 0)))
(option '(#\V "version") #f #f
(lambda args
(show-version-and-exit "guix edit")))))
(define (show-help)
(display (G_ "Usage: guix edit PACKAGE...
Start $VISUAL or $EDITOR to edit the definitions of PACKAGE...\n"))
(display (G_ "
-h, --help display this help and exit"))
(display (G_ "
-V, --version display version information and exit"))
(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 (G_ "file '~a' not found in search path ~s~%")
file path))
(define (location->location-specification location)
"Return the location specification for LOCATION for a typical editor command
(list (string-append "+"
(location-line location)))
(search-path* %load-path (location-file location))))
(define (guix-edit . args)
(define (parse-arguments)
;; Return the list of package names.
(args-fold* args %options
(lambda (opt name arg result)
(leave (G_ "~A: unrecognized option~%") name))
(let* ((specs (reverse (parse-arguments)))
(locations (map specification->location specs)))
(catch 'system-error
(lambda ()
(let ((file-names (append-map location->location-specification
;; 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 (G_ "failed to launch '~a': ~a~%")
(%editor) (strerror errno))))))))