[PATCH] gitk: Take only numeric version components when computing $git_version

[Anders Kaseorg <andersk@MIT.EDU>]

This fixes errors running with release candidate versions of Git:
  Error in startup script: expected version number but got "1.7.4-rc0"

Also, $git_version is no longer artificially limited to three
components.  That limitation was added by commit
194bbf6cc8c2f3c14a920c841841d66b7667a848 to deal with msysGit version
strings like “1.6.4.msysgit.0”, and we don’t need it now.  Hence as
another side effect, this enables showing notes with git version
1.6.6.2 or 1.6.6.3, as originally intended by commit
7defefb134270b6e8ab3e422b343b41a4a383f5d.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>
---
 gitk-git/gitk |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/gitk-git/gitk b/gitk-git/gitk
index e82c6bf..9cbc09d 100755
--- a/gitk-git/gitk
+++ b/gitk-git/gitk
@@ -11581,7 +11581,7 @@ if {![info exists have_ttk]} {
 set use_ttk [expr {$have_ttk && $want_ttk}]
 set NS [expr {$use_ttk ? "ttk" : ""}]
 
-set git_version [join [lrange [split [lindex [exec git version] end] .] 0 2] .]
+regexp {^git version ([\d.]*\d)} [exec git version] _ git_version
 
 set show_notes {}
 if {[package vcompare $git_version "1.6.6.2"] >= 0} {
-- 
1.7.4-rc0