add-interactive.c: implement show-help command

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 <[email protected]>

Author: slavicaDj

add-interactive.c

@@ -244,3 +244,20 @@ void add_i_print_modified(void)
 	free(files);
 	hashmap_free(&s.file_map, 1);
 }
+
+void add_i_show_help(void)
+{
+	const char *help_color = get_color(COLOR_HELP);
+	color_fprintf_ln(stdout, help_color, "status        - %s",
+			_("show paths with changes"));
+	color_fprintf_ln(stdout, help_color, "update        - %s",
+			_("add working tree state to the staged set of changes"));
+	color_fprintf_ln(stdout, help_color, "revert        - %s",
+			_("revert staged set of changes back to the HEAD version"));
+	color_fprintf_ln(stdout, help_color, "patch         - %s",
+			_("pick hunks and update selectively"));
+	color_fprintf_ln(stdout, help_color, "diff          - %s",
+			_("view diff between HEAD and index"));
+	color_fprintf_ln(stdout, help_color, "add untracked - %s",
+			_("add contents of untracked files to the staged set of changes"));
+}

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);
 
-#endif
+void add_i_show_help(void);
+
+#endif

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)
+		add_i_show_help();
 	else
 		usage_with_options(builtin_add_helper_usage,
 				   options);