When using show_tool_help from git-difftool we will want it to print
"git difftool" not "git mergetool" so use "git ${TOOL_MODE}tool".

Signed-off-by: John Keeping <j...@keeping.me.uk>
---
 git-mergetool--lib.sh | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/git-mergetool--lib.sh b/git-mergetool--lib.sh
index 1748315..4c1e129 100644
--- a/git-mergetool--lib.sh
+++ b/git-mergetool--lib.sh
@@ -188,12 +188,14 @@ show_tool_help () {
                        unavailable="$unavailable$i$LF"
                fi
        done
+
+       cmd_name=${TOOL_MODE}tool
        if test -n "$available"
        then
-               echo "'git mergetool --tool=<tool>' may be set to one of the 
following:"
+               echo "'git $cmd_name --tool=<tool>' may be set to one of the 
following:"
                echo "$available" | sort | sed -e 's/^/ /'
        else
-               echo "No suitable tool for 'git mergetool --tool=<tool>' found."
+               echo "No suitable tool for 'git $cmd_name --tool=<tool>' found."
        fi
        if test -n "$unavailable"
        then
-- 
1.8.1

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