[PATCH] emacs: Add "View graph" actions to system graph commands.

[Alex Kost <alezost@gmail.com>]

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I like graph commands.  Thanks, Ludo!

This patch adds "View graph" action for the new "M-x guix RET system"
commands.


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From 79027171c9be2cececde951caf54758c4e1bb8f5 Mon Sep 17 00:00:00 2001
From: Alex Kost <alezost@gmail.com>
Date: Thu, 15 Oct 2015 22:10:32 +0300
Subject: [PATCH] emacs: Add "View graph" actions to system graph commands.

* emacs/guix-command.el (guix-command-additional-execute-arguments,
  guix-command-special-executors): Add "View graph" actions for
  'dmd-graph' and 'extension-graph' commands.
* doc/emacs.texi (Emacs Popup Interface): Document "View graph" action.
---
 doc/emacs.texi        | 31 +++++++++++++++++++++++++++++++
 emacs/guix-command.el | 26 ++++++++++++++++----------
 2 files changed, 47 insertions(+), 10 deletions(-)

diff --git a/doc/emacs.texi b/doc/emacs.texi
index ab69515..cfd2301 100644
--- a/doc/emacs.texi
+++ b/doc/emacs.texi
@@ -531,6 +531,37 @@ GNU Emacs Manual}).
 
 @end itemize
 
+Several commands (@command{guix graph}, @command{guix system dmd-graph}
+and @command{guix system extension-graph}) also have a ``View graph''
+action, which allows to view a generated graph using @command{dot}
+command (specified by @code{guix-dot-program} variable).  By default a
+PNG file will be saved in @file{/tmp} directory and will be opened
+directly in Emacs.  This behavior may be changed with the following
+variables:
+
+@table @code
+
+@item guix-find-file-function
+Function used to open a generated graph.  If you want to open a graph in
+an external program, you can do it by modifying this variable---for
+example, you can use a functionality provided by the Org Mode
+(@pxref{Top,,, org, The Org Manual}):
+
+@example
+(setq guix-find-file-function 'org-open-file)
+(add-to-list 'org-file-apps '("\\.png\\'" . "sxiv %s"))
+@end example
+
+@item guix-dot-default-arguments
+Command line arguments to run @command{dot} command.  If you change an
+output format (for example, into @code{-Tpdf}), you also need to change
+the next variable.
+
+@item guix-dot-file-name-function
+Function used to define a name of the generated graph file.  Default
+name is @file{/tmp/graph-XXXXXX.png}.
+
+@end table
 
 @node Emacs Prettify
 @section Guix Prettify Mode
diff --git a/emacs/guix-command.el b/emacs/guix-command.el
index 3ae7791..1a42594 100644
--- a/emacs/guix-command.el
+++ b/emacs/guix-command.el
@@ -499,15 +499,17 @@ to be modified."
   "List of default 'execute' action arguments.")
 
 (defvar guix-command-additional-execute-arguments
-  `((("build")
-     ,(guix-command-make-argument
-       :name "log" :char ?l :doc "View build log"))
-    (("graph")
-     ,(guix-command-make-argument
-       :name "view" :char ?v :doc "View graph"))
-    (("size")
-     ,(guix-command-make-argument
-       :name "view" :char ?v :doc "View map")))
+  (let ((graph-arg (guix-command-make-argument
+                    :name "view" :char ?v :doc "View graph")))
+    `((("build")
+       ,(guix-command-make-argument
+         :name "log" :char ?l :doc "View build log"))
+      (("graph") ,graph-arg)
+      (("size")
+       ,(guix-command-make-argument
+         :name "view" :char ?v :doc "View map"))
+      (("system" "dmd-graph") ,graph-arg)
+      (("system" "extension-graph") ,graph-arg)))
   "Alist of guix commands and additional 'execute' action arguments.")
 
 (defun guix-command-execute-arguments (commands)
@@ -531,7 +533,11 @@ to be modified."
     (("graph")
      ("view" . guix-run-view-graph))
     (("size")
-     ("view" . guix-run-view-size-map)))
+     ("view" . guix-run-view-size-map))
+    (("system" "dmd-graph")
+     ("view" . guix-run-view-graph))
+    (("system" "extension-graph")
+     ("view" . guix-run-view-graph)))
   "Alist of guix commands and alists of special executers for them.
 See also `guix-command-default-executors'.")
 
-- 
2.5.0