mergetools: add description to all diff/merge tools

The output of `git mergetool --tool-help` and `git difftool --tool-help`
only showed the `alias` of each available merge/diff tool.

It is not always obvious what tool these `aliases` end up using (ex:
`opendiff` runs `FileMerge` and `bc` runs `Beyond Compare`).

This commit adds a short description to each of them to help the user
identify the `alias` they want.

Signed-off-by: Fernando Ramos <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: greenfoo

mergetools/araxis

@@ -2,6 +2,10 @@ diff_cmd () {
 	"$merge_tool_path" -wait -2 "$LOCAL" "$REMOTE" >/dev/null 2>&1
 }
 
+diff_cmd_help () {
+	echo "Use Araxis Merge (requires a graphical session)"
+}
+
 merge_cmd () {
 	if $base_present
 	then
@@ -13,6 +17,10 @@ merge_cmd () {
 	fi
 }
 
+merge_cmd_help () {
+	echo "Use Araxis Merge (requires a graphical session)"
+}
+
 translate_merge_tool_path() {
 	echo compare
 }

mergetools/bc

@@ -2,6 +2,10 @@ diff_cmd () {
 	"$merge_tool_path" "$LOCAL" "$REMOTE"
 }
 
+diff_cmd_help () {
+	echo "Use Beyond Compare (requires a graphical session)"
+}
+
 merge_cmd () {
 	if $base_present
 	then
@@ -13,6 +17,10 @@ merge_cmd () {
 	fi
 }
 
+merge_cmd_help () {
+	echo "Use Beyond Compare (requires a graphical session)"
+}
+
 translate_merge_tool_path() {
 	if type bcomp >/dev/null 2>/dev/null
 	then

mergetools/codecompare

@@ -2,6 +2,10 @@ diff_cmd () {
 	"$merge_tool_path" "$LOCAL" "$REMOTE"
 }
 
+diff_cmd_help () {
+	echo "Use Code Compare (requires a graphical session)"
+}
+
 merge_cmd () {
 	if $base_present
 	then
@@ -13,6 +17,10 @@ merge_cmd () {
 	fi
 }
 
+merge_cmd_help () {
+	echo "Use Code Compare (requires a graphical session)"
+}
+
 translate_merge_tool_path() {
 	if merge_mode
 	then

mergetools/deltawalker

@@ -2,6 +2,10 @@ diff_cmd () {
 	"$merge_tool_path" "$LOCAL" "$REMOTE" >/dev/null 2>&1
 }
 
+diff_cmd_help () {
+	echo "Use DeltaWalker (requires a graphical session)"
+}
+
 merge_cmd () {
 	# Adding $(pwd)/ in front of $MERGED should not be necessary.
 	# However without it, DeltaWalker (at least v1.9.8 on Windows)
@@ -16,6 +20,10 @@ merge_cmd () {
 	fi >/dev/null 2>&1
 }
 
+merge_cmd_help () {
+	echo "Use DeltaWalker (requires a graphical session)"
+}
+
 translate_merge_tool_path () {
 	echo DeltaWalker
 }

mergetools/diffmerge

@@ -2,6 +2,10 @@ diff_cmd () {
 	"$merge_tool_path" "$LOCAL" "$REMOTE" >/dev/null 2>&1
 }
 
+diff_cmd_help () {
+	echo "Use DiffMerge (requires a graphical session)"
+}
+
 merge_cmd () {
 	if $base_present
 	then
@@ -13,6 +17,10 @@ merge_cmd () {
 	fi
 }
 
+merge_cmd_help () {
+	echo "Use DiffMerge (requires a graphical session)"
+}
+
 exit_code_trustable () {
 	true
 }

mergetools/diffuse

@@ -2,6 +2,10 @@ diff_cmd () {
 	"$merge_tool_path" "$LOCAL" "$REMOTE" | cat
 }
 
+diff_cmd_help () {
+	echo "Use Diffuse (requires a graphical session)"
+}
+
 merge_cmd () {
 	if $base_present
 	then
@@ -13,3 +17,7 @@ merge_cmd () {
 			"$LOCAL" "$MERGED" "$REMOTE" | cat
 	fi
 }
+
+merge_cmd_help () {
+	echo "Use Diffuse (requires a graphical session)"
+}

mergetools/ecmerge

@@ -2,6 +2,10 @@ diff_cmd () {
 	"$merge_tool_path" --default --mode=diff2 "$LOCAL" "$REMOTE"
 }
 
+diff_cmd_help () {
+	echo "Use ECMerge (requires a graphical session)"
+}
+
 merge_cmd () {
 	if $base_present
 	then
@@ -12,3 +16,7 @@ merge_cmd () {
 			--default --mode=merge2 --to="$MERGED"
 	fi
 }
+
+merge_cmd_help () {
+	echo "Use ECMerge (requires a graphical session)"
+}

mergetools/emerge

@@ -2,6 +2,10 @@ diff_cmd () {
 	"$merge_tool_path" -f emerge-files-command "$LOCAL" "$REMOTE"
 }
 
+diff_cmd_help () {
+	echo "Use Emacs' Emerge"
+}
+
 merge_cmd () {
 	if $base_present
 	then
@@ -17,6 +21,10 @@ merge_cmd () {
 	fi
 }
 
+merge_cmd_help () {
+	echo "Use Emacs' Emerge"
+}
+
 translate_merge_tool_path() {
 	echo emacs
 }

mergetools/examdiff

@@ -2,6 +2,10 @@ diff_cmd () {
 	"$merge_tool_path" "$LOCAL" "$REMOTE" -nh
 }
 
+diff_cmd_help () {
+	echo "Use ExamDiff Pro (requires a graphical session)"
+}
+
 merge_cmd () {
 	if $base_present
 	then
@@ -11,6 +15,10 @@ merge_cmd () {
 	fi
 }
 
+merge_cmd_help () {
+	echo "Use ExamDiff Pro (requires a graphical session)"
+}
+
 translate_merge_tool_path() {
 	mergetool_find_win32_cmd "ExamDiff.com" "ExamDiff Pro"
 }

mergetools/guiffy

@@ -2,6 +2,10 @@ diff_cmd () {
 	"$merge_tool_path" "$LOCAL" "$REMOTE"
 }
 
+diff_cmd_help () {
+	echo "Use Guiffy's Diff Tool (requires a graphical session)"
+}
+
 merge_cmd () {
 	if $base_present
 	then
@@ -13,6 +17,10 @@ merge_cmd () {
 	fi
 }
 
+merge_cmd_help () {
+	echo "Use Guiffy's Diff Tool (requires a graphical session)"
+}
+
 exit_code_trustable () {
 	true
 }