difftool: print list of valid tools with '--tool-help'

diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN
index 39cde784c947fae6a2f294caac1898b9199d769d..1c06cec047aec084453954b87718fbd4abf87c2b 100755 (executable)
--- a/GIT-VERSION-GEN
+++ b/GIT-VERSION-GEN
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 GVF=GIT-VERSION-FILE
-DEF_VER=v1.6.3.GIT
+DEF_VER=v1.7.10-rc1
 
 LF='
 '
@@ -12,7 +12,7 @@ if test -f version
 then
        VN=$(cat version) || VN="$DEF_VER"
 elif test -d .git -o -f .git &&
-       VN=$(git describe --abbrev=4 HEAD 2>/dev/null) &&
+       VN=$(git describe --match "v[0-9]*" --abbrev=4 HEAD 2>/dev/null) &&
        case "$VN" in
        *$LF*) (exit 1) ;;
        v[0-9]*)