[PATCH 3/3] mergetool--lib: list user configured tools in '--tool-help'

[John Keeping]

Signed-off-by: John Keeping <j...@keeping.me.uk>
---
 git-mergetool--lib.sh | 41 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

diff --git a/git-mergetool--lib.sh b/git-mergetool--lib.sh
index b44a2c8..e338be5 100644
--- a/git-mergetool--lib.sh
+++ b/git-mergetool--lib.sh
@@ -20,9 +20,24 @@ is_available () {
        type "$merge_tool_path" >/dev/null 2>&1
 }
 
+list_config_tools () {
+       section=$1
+       line_prefix=${2:-}
+
+       git config --get-regexp $section'\..*\.cmd' |
+       while read -r key value
+       do
+               toolname=${key#$section.}
+               toolname=${toolname%.cmd}
+
+               printf "%s%s\n" "$line_prefix" "$toolname"
+       done
+}
+
 show_tool_names () {
        condition=${1:-true} per_line_prefix=${2:-} preamble=${3:-}
        not_found_msg=${4:-}
+       extra_content=${5:-}
 
        shown_any=
        ( cd "$MERGE_TOOLS_DIR" && ls ) | {
@@ -41,6 +56,19 @@ show_tool_names () {
                        fi
                done
 
+               if test -n "$extra_content"
+               then
+                       if test -n "$preamble"
+                       then
+                               # Note: no '\n' here since we don't want a
+                               # blank line if there is no initial content.
+                               printf "%s" "$preamble"
+                               preamble=
+                       fi
+                       shown_any=yes
+                       printf "\n%s\n" "$extra_content"
+               fi
+
                if test -n "$preamble" && test -n "$not_found_msg"
                then
                        printf "%s\n" "$not_found_msg"
@@ -255,9 +283,20 @@ show_tool_help () {
        any_shown=no
 
        cmd_name=${TOOL_MODE}tool
+       config_tools=$({
+               diff_mode && list_config_tools difftool "$tab$tab"
+               list_config_tools mergetool "$tab$tab"
+       } | sort)
+       extra_content=
+       if test -n "$config_tools"
+       then
+               extra_content="${tab}user-defined:${LF}$config_tools"
+       fi
+
        show_tool_names 'mode_ok && is_available' "$tab$tab" \
                "$tool_opt may be set to one of the following:" \
-               "No suitable tool for 'git $cmd_name --tool=<tool>' found." &&
+               "No suitable tool for 'git $cmd_name --tool=<tool>' found." \
+               "$extra_content" &&
                any_shown=yes
 
        show_tool_names 'mode_ok && ! is_available' "$tab$tab" \
-- 
1.8.1.1

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