[PATCH] mergetool--lib: simplify guess_merge_tool()

["René Scharfe" <rene.scharfe@lsrfire.ath.cx>]

Use a case statement instead of calling grep to find out if the editor's
name contains the string "vim".  Remove the check for emacs, as this
branch did the same as the default one anyway.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
---
This removes all grep calls from this script.

 git-mergetool--lib.sh |   13 ++++++-------
 1 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/git-mergetool--lib.sh b/git-mergetool--lib.sh
index f7c571e..5b62785 100644
--- a/git-mergetool--lib.sh
+++ b/git-mergetool--lib.sh
@@ -338,15 +338,14 @@ guess_merge_tool () {
 		fi
 		tools="$tools gvimdiff diffuse ecmerge p4merge araxis"
 	fi
-	if echo "${VISUAL:-$EDITOR}" | grep emacs > /dev/null 2>&1; then
-		# $EDITOR is emacs so add emerge as a candidate
-		tools="$tools emerge vimdiff"
-	elif echo "${VISUAL:-$EDITOR}" | grep vim > /dev/null 2>&1; then
-		# $EDITOR is vim so add vimdiff as a candidate
+	case "${VISUAL:-$EDITOR}" in
+	*vim*)
 		tools="$tools vimdiff emerge"
-	else
+		;;
+	*)
 		tools="$tools emerge vimdiff"
-	fi
+		;;
+	esac
 	echo >&2 "merge tool candidates: $tools"
 
 	# Loop over each candidate and stop when a valid merge tool is found.
-- 
1.6.5