vis: add rudimentary :help command

2 files changed, 36 insertions, 0 deletions

diff --git a/config.def.h b/config.def.h
index 822ad75..e84629e 100644
--- a/config.def.h
+++ b/config.def.h
@@ -36,6 +36,7 @@ static Command cmds[] = {
 	/* command name / optional alias, function,       options */
 	{ { "bdelete"                  }, cmd_bdelete,    CMD_OPT_FORCE },
 	{ { "edit"                     }, cmd_edit,       CMD_OPT_FORCE },
+	{ { "help"                     }, cmd_help,       CMD_OPT_NONE  },
 	{ { "new"                      }, cmd_new,        CMD_OPT_NONE  },
 	{ { "open"                     }, cmd_open,       CMD_OPT_NONE  },
 	{ { "qall"                     }, cmd_qall,       CMD_OPT_FORCE },
diff --git a/vis.c b/vis.c
index 249f837..44aa733 100644
--- a/vis.c
+++ b/vis.c
@@ -455,6 +455,8 @@ static bool cmd_saveas(Filerange*, enum CmdOpt, const char *argv[]);
 static bool cmd_filter(Filerange*, enum CmdOpt, const char *argv[]);
 /* switch to the previous/next saved state of the text, chronologically */
 static bool cmd_earlier_later(Filerange*, enum CmdOpt, const char *argv[]);
+/* dump current key bindings */
+static bool cmd_help(Filerange*, enum CmdOpt, const char *argv[]);
 
 static void action_reset(Action *a);
 static void switchmode_to(Mode *new_mode);
@@ -2302,6 +2304,39 @@ static bool cmd_earlier_later(Filerange *range, enum CmdOpt opt, const char *arg
 	return pos != EPOS;
 }
 
+bool print_keybinding(const char *key, void *value, void *data) {
+	Text *txt = (Text*)data;
+	KeyBinding *binding = (KeyBinding*)value;
+	const char *desc = binding->alias;
+	if (!desc && binding->action)
+		desc = binding->action->help;
+	return text_printf(txt, text_size(txt), "  %-15s\t%s\n", key, desc ? desc : "");
+}
+
+static void print_mode(Mode *mode, Text *txt, bool recursive) {
+	if (recursive && mode->parent)
+		print_mode(mode->parent, txt, recursive);
+	map_iterate(mode->bindings, print_keybinding, txt);
+}
+
+static bool cmd_help(Filerange *range, enum CmdOpt opt, const char *argv[]) {
+	if (!vis_window_new(NULL))
+		return false;
+	
+	Text *txt = vis->win->file->text;
+	for (int i = 0; i < LENGTH(vis_modes); i++) {
+		Mode *mode = &vis_modes[i];
+		if (mode->isuser || i == VIS_MODE_TEXTOBJ) {
+			text_printf(txt, text_size(txt), "\n%s\n\n", mode->name);
+			print_mode(mode, txt, i == VIS_MODE_NORMAL ||
+				i == VIS_MODE_INSERT);
+		}
+	}
+	
+	text_save(txt, NULL);
+	return true;
+}
+
 static Filepos parse_pos(char **cmd) {
 	size_t pos = EPOS;
 	View *view = vis->win->view;