98 lines
3.7 KiB
Scheme
98 lines
3.7 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2015 Mathieu Lirzin <mthl@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix scripts edit)
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#:use-module (guix ui)
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#:use-module (guix scripts)
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#:use-module (guix utils)
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#:use-module (guix packages)
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#:use-module (gnu packages)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-37)
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#:export (%editor
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guix-edit))
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(define %options
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(list (option '(#\h "help") #f #f
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(lambda args
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(show-help)
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(exit 0)))
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(option '(#\V "version") #f #f
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(lambda args
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(show-version-and-exit "guix edit")))))
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(define (show-help)
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(display (_ "Usage: guix edit PACKAGE...
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Start $VISUAL or $EDITOR to edit the definitions of PACKAGE...\n"))
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(newline)
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(display (_ "
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-h, --help display this help and exit"))
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(display (_ "
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-V, --version display version information and exit"))
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(newline)
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(show-bug-report-information))
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(define %editor
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;; XXX: It would be better to default to something more likely to be
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;; pre-installed on an average GNU system. Since Nano is not suited for
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;; editing Scheme, Emacs is used instead.
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(make-parameter (or (getenv "VISUAL") (getenv "EDITOR") "emacs")))
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(define (search-path* path file)
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"Like 'search-path' but exit if FILE is not found."
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(let ((absolute-file-name (search-path path file)))
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(unless absolute-file-name
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;; Shouldn't happen unless somebody fiddled with the 'location' field.
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(leave (_ "file '~a' not found in search path ~s~%")
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file path))
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absolute-file-name))
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(define (package->location-specification package)
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"Return the location specification for PACKAGE for a typical editor command
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line."
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(let ((loc (package-location package)))
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(list (string-append "+"
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(number->string
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(location-line loc)))
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(search-path* %load-path (location-file loc)))))
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(define (guix-edit . args)
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(with-error-handling
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(let* ((specs (parse-command-line args %options '(())
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#:argument-handler cons))
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(packages (map specification->package specs)))
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(for-each (lambda (package)
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(unless (package-location package)
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(leave (_ "source location of package '~a' is unknown~%")
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(package-full-name package))))
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packages)
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(catch 'system-error
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(lambda ()
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(let ((file-names (append-map package->location-specification
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packages)))
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;; Use `system' instead of `exec' in order to sanely handle
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;; possible command line arguments in %EDITOR.
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(exit (system (string-join (cons (%editor) file-names))))))
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(lambda args
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(let ((errno (system-error-errno args)))
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(leave (_ "failed to launch '~a': ~a~%")
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(%editor) (strerror errno))))))))
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