[PATCH 5/7] add-interactive.c: implement show-help command

["Slavica Djukic via GitGitGadget" <gitgitgadget@gmail.com>]

From: Slavica Djukic <slawica92@hotmail.com>

Implement show-help command in add-interactive.c and use it in
builtin add--helper.c.

Use command name "show-help" instead of "help": add--helper is
builtin, hence add--helper --help would be intercepted by
handle_builtin and re-routed to the help command, without ever
calling cmd_add__helper().

Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 add-interactive.c     | 19 +++++++++++++++++++
 add-interactive.h     |  2 ++
 builtin/add--helper.c |  7 ++++++-
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/add-interactive.c b/add-interactive.c
index c55d934186..ff5bfbac49 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -8,6 +8,16 @@
 
 #define HEADER_INDENT "      "
 
+/* TRANSLATORS: please do not translate the command names
+   'status', 'update', 'revert', etc. */
+static const char help_info[] = 
+		N_("status        - show paths with changes\n"
+		"update        - add working tree state to the staged set of changes\n"
+		"revert        - revert staged set of changes back to the HEAD version\n"
+		"patch         - pick hunks and update selectively\n"
+		"diff          - view diff between HEAD and index\n"
+		"add untracked - add contents of untracked files to the staged set of changes");
+
 enum collection_phase {
 	WORKTREE,
 	INDEX
@@ -244,3 +254,12 @@ void add_i_print_modified(void)
 	free(files);
 	hashmap_free(&s.file_map, 1);
 }
+
+void show_help(void)
+{
+	const char *help_color = get_color(COLOR_HELP);
+	const char *modified_fmt = _("%s");
+	printf("\n");
+	color_fprintf(stdout, help_color, modified_fmt, _(help_info));
+	printf("\n");
+}
diff --git a/add-interactive.h b/add-interactive.h
index 1f4747553c..a74c65b7e1 100644
--- a/add-interactive.h
+++ b/add-interactive.h
@@ -5,4 +5,6 @@ int add_i_config(const char *var, const char *value, void *cbdata);
 
 void add_i_print_modified(void);
 
+void show_help(void);
+
 #endif
\ No newline at end of file
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
index 43545d9af5..e288412d56 100644
--- a/builtin/add--helper.c
+++ b/builtin/add--helper.c
@@ -10,7 +10,8 @@ static const char * const builtin_add_helper_usage[] = {
 
 enum cmd_mode {
 	DEFAULT = 0,
-	STATUS
+	STATUS,
+	HELP
 };
 
 int cmd_add__helper(int argc, const char **argv, const char *prefix)
@@ -20,6 +21,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
 	struct option options[] = {
 		OPT_CMDMODE(0, "status", &mode,
 			 N_("print status information with diffstat"), STATUS),
+		OPT_CMDMODE(0, "show-help", &mode,
+			 N_("show help"), HELP),
 		OPT_END()
 	};
 
@@ -30,6 +33,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
 
 	if (mode == STATUS)
 		add_i_print_modified();
+	else if (mode == HELP)
+		show_help();
 	else
 		usage_with_options(builtin_add_helper_usage,
 				   options);
-- 
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