From 8472b2fd2d4c4d060b1333c9c527575d965a0ebd Mon Sep 17 00:00:00 2001
From: Alex Kost <alezost@gmail.com>
Date: Fri, 8 Apr 2016 11:49:39 +0300
Subject: [PATCH] emacs: Add 'guix-find-license-definition' command.
* emacs/guix-license.el (guix-license-file): New procedure.
(guix-find-license-definition): New command.
* doc/emacs.texi (Emacs Licenses): Document it.
---
doc/emacs.texi | 3 +++
emacs/guix-license.el | 21 +++++++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/doc/emacs.texi b/doc/emacs.texi
index ed8896ad431..575e87c2628 100644
--- a/doc/emacs.texi
+++ b/doc/emacs.texi
@@ -544,6 +544,9 @@ Display a list of available licenses. You can press @kbd{@key{RET}}
there to display packages with this license in the same way as @kbd{M-x
guix-packages-by-license} would do (@pxref{Emacs Commands}).
+@item M-x guix-find-license-definition
+Open @file{@dots{}/guix/licenses.scm} and move to the specified license.
+
@end table
diff --git a/emacs/guix-license.el b/emacs/guix-license.el
index 940f5518e27..6003a21aac6 100644
--- a/emacs/guix-license.el
+++ b/emacs/guix-license.el
@@ -27,12 +27,33 @@
(require 'guix-backend)
(require 'guix-guile)
+(defun guix-license-file (&optional directory)
+ "Return name of the file with license definitions.
+DIRECTORY is a directory with Guix source (`guix-directory' by default)."
+ (expand-file-name "guix/licenses.scm"
+ (or directory guix-directory)))
+
(defun guix-lookup-license-url (license)
"Return URL of a LICENSE."
(or (guix-eval-read (guix-make-guile-expression
'lookup-license-uri license))
(error "Hm, I don't know URL of '%s' license" license)))
+;;;###autoload
+(defun guix-find-license-definition (license &optional directory)
+ "Open licenses file from DIRECTORY and move to the LICENSE definition.
+See `guix-license-file' for the meaning of DIRECTORY.
+Interactively, with prefix argument, prompt for DIRECTORY."
+ (interactive
+ (list (guix-read-license-name)
+ (guix-read-directory)))
+ (find-file (guix-license-file directory))
+ (goto-char (point-min))
+ (when (re-search-forward (concat "\"" (regexp-quote license) "\"")
+ nil t)
+ (beginning-of-defun)
+ (recenter 1)))
+
;;;###autoload
(defun guix-browse-license-url (license)
"Browse URL of a LICENSE."
--
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