From 19cc94fc81a8b655c7104d1f058fa2ac1b0a52c4 Mon Sep 17 00:00:00 2001
From: Tom Willemsen
Date: Wed, 19 Dec 2012 11:29:46 +0100
Subject: Only make TAGS when TAGS target available

The "(Shell command failed with code 2 and no output)" was starting to
drive me nuts.

* .emacs.d/site-lisp/oni.el (oni:after-save-func): Check if there is a
  `TAGS:' target in the found makefile before trying to make.
---
 .emacs.d/site-lisp/oni.el | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/.emacs.d/site-lisp/oni.el b/.emacs.d/site-lisp/oni.el
index 8930d6d..46c87fb 100644
--- a/.emacs.d/site-lisp/oni.el
+++ b/.emacs.d/site-lisp/oni.el
@@ -68,8 +68,10 @@ DOT are intentionally being skipped."
   "Function for `after-save-hook'."
   (oni:compile-el)
   (executable-make-buffer-file-executable-if-script-p)
-  (let ((dom-dir (locate-dominating-file (buffer-file-name) "Makefile")))
-    (when dom-dir
+  (let* ((dom-dir (locate-dominating-file (buffer-file-name) "Makefile"))
+         (TAGSp (not (string= "" (shell-command-to-string
+                                  (concat "grep \"^TAGS:\" " dom-dir "Makefile"))))))
+    (when (and dom-dir TAGSp)
       (shell-command
        (concat "make -C " dom-dir " TAGS >/dev/null 2>&1")))))
 
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