git-difftool is used instead of the built-in external diff
code when git is >= 1.7.0.  git-difftool's '--extcmd=frotz'
feature was first introduced in 1.7.0 and is the mechanism
through which we launch the configured difftool.

A benefit of this change is that gitk's external diff feature
no longer needs write-access to the current directory.

Signed-off-by: David Aguilar <davvid@gmail.com>
---

Unlike previous versions, this one checks the git version at runtime
and gracefully falls back to the old code when git is older.

 gitk |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/gitk b/gitk
index 1f36a3e..a49eecc 100755
--- a/gitk
+++ b/gitk
@@ -3355,6 +3355,7 @@ proc external_diff {} {
     global flist_menu_file
     global diffids
     global extdifftool
+    global git_version
 
     if {[llength $diffids] == 1} {
         # no reference commit given
@@ -3375,6 +3376,19 @@ proc external_diff {} {
         set diffidto [lindex $diffids 1]
     }
 
+    if {[package vcompare $git_version "1.7.0"] >= 0} {
+        set cmd [list "git" "difftool" "--no-prompt" "--extcmd=$extdifftool"]
+        if {$diffidfrom ne $nullid && $diffidfrom ne $nullid2} {
+            lappend cmd $diffidfrom
+        }
+        if {$diffidto ne $nullid && $diffidto ne $nullid2} {
+            lappend cmd $diffidto
+        }
+        lappend cmd "--" $flist_menu_file
+        eval exec $cmd &
+        return
+    }
+
     # make sure that several diffs wont collide
     set diffdir [gitknewtmpdir]
     if {$diffdir eq {}} return
-- 
1.7.0.3.313.g87b3c

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