mergetool: support --tool-help option like difftool does

This way we do not have to risk the list of tools going out of sync
between the implementation and the documentation.

In the same spirit as bf73fc21 (difftool: print list of valid tools
with '--tool-help', 2012-03-29), trim the list of merge backends in
the documentation.  We do not want to have a complete list of valid
tools; we only want a list to help people guess what kind of things
the tools do to be specified there, and refer them to --tool-help
for a complete list.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Documentation/git-mergetool.txt

@@ -27,9 +27,9 @@ OPTIONS
 -t <tool>::
 --tool=<tool>::
 	Use the merge resolution program specified by <tool>.
-	Valid merge tools are:
-	araxis, bc3, diffuse, ecmerge, emerge, gvimdiff, kdiff3,
-	meld, opendiff, p4merge, tkdiff, tortoisemerge, vimdiff and xxdiff.
+	Valid values include emerge, gvimdiff, kdiff3,
+	meld, vimdiff, and tortoisemerge. Run `git mergetool --tool-help`
+	for the list of valid <tool> settings.
 +
 If a merge resolution program is not specified, 'git mergetool'
 will use the configuration variable `merge.tool`.  If the

git-mergetool--lib.sh

@@ -111,7 +111,7 @@ run_merge_tool () {
 	return $status
 }
 
-guess_merge_tool () {
+list_merge_tool_candidates () {
 	if merge_mode
 	then
 		tools="tortoisemerge"
@@ -136,6 +136,10 @@ guess_merge_tool () {
 		tools="$tools emerge vimdiff"
 		;;
 	esac
+}
+
+guess_merge_tool () {
+	list_merge_tool_candidates
 	echo >&2 "merge tool candidates: $tools"
 
 	# Loop over each candidate and stop when a valid merge tool is found.

git-mergetool.sh

@@ -8,7 +8,7 @@
 # at the discretion of Junio C Hamano.
 #
 
-USAGE='[--tool=tool] [-y|--no-prompt|--prompt] [file to merge] ...'
+USAGE='[--tool=tool] [--tool-help] [-y|--no-prompt|--prompt] [file to merge] ...'
 SUBDIRECTORY_OK=Yes
 OPTIONS_SPEC=
 TOOL_MODE=merge
@@ -284,11 +284,51 @@ merge_file () {
     return 0
 }
 
+show_tool_help () {
+	TOOL_MODE=merge
+	list_merge_tool_candidates
+	unavailable= available= LF='
+'
+	for i in $tools
+	do
+		merge_tool_path=$(translate_merge_tool_path "$i")
+		if type "$merge_tool_path" >/dev/null 2>&1
+		then
+			available="$available$i$LF"
+		else
+			unavailable="$unavailable$i$LF"
+		fi
+	done
+	if test -n "$available"
+	then
+		echo "'git mergetool --tool=<tool>' may be set to one of the following:"
+		echo "$available" | sort | sed -e 's/^/	/'
+	else
+		echo "No suitable tool for 'git mergetool --tool=<tool>' found."
+	fi
+	if test -n "$unavailable"
+	then
+		echo
+		echo 'The following tools are valid, but not currently available:'
+		echo "$unavailable" | sort | sed -e 's/^/	/'
+	fi
+	if test -n "$unavailable$available"
+	then
+		echo
+		echo "Some of the tools listed above only work in a windowed"
+		echo "environment. If run in a terminal-only session, they will fail."
+	fi
+	exit 0
+}
+
 prompt=$(git config --bool mergetool.prompt || echo true)
 
 while test $# != 0
 do
     case "$1" in
+	--tool-help)
+		show_tool_help
+		;;
 	-t|--tool*)
 	    case "$#,$1" in
 		*,*=*)