Add auto_hide_playlists_panel option

(Terminology is a bit difficult here, it's not really a tree and
"playlists list" doesn't quite roll off the tongue...)

Requested in cmus#897, etc.

Doc/cmus.txt

@@ -851,6 +851,10 @@ auto_expand_albums_follow, auto_expand_albums_search, auto_expand_albums_selcur
 	option. Any "auto_expand_albums_\* = false" implies "show_all_tracks =
 	true".
 
+auto_hide_playlists_panel (false)
+	Hide the left panel in playlist view. The panel will show as needed when
+	activated with win-next (*tab*).
+
 auto_reshuffle (true)
 	Reshuffle a playlist when the end of a shuffled list is reached.
 

options.c

@@ -79,6 +79,7 @@ int skip_track_info = 0;
 int auto_expand_albums_follow = 1;
 int auto_expand_albums_search = 1;
 int auto_expand_albums_selcur = 1;
+int auto_hide_playlists_panel = 0;
 int show_all_tracks = 1;
 int mouse = 0;
 int mpris = 1;
@@ -509,6 +510,21 @@ static void set_tree_width_max(void *data, const char *buf)
 
 /* callbacks for toggle options {{{ */
 
+static void get_auto_hide_playlists_panel(void *data, char *buf, size_t size)
+{
+	strscpy(buf, bool_names[auto_hide_playlists_panel], size);
+}
+
+static void set_auto_hide_playlists_panel(void *data, const char *buf)
+{
+	parse_bool(buf, &auto_hide_playlists_panel);
+}
+
+static void toggle_auto_hide_playlists_panel(void *data)
+{
+	auto_hide_playlists_panel ^= 1;
+}
+
 static void get_auto_reshuffle(void *data, char *buf, size_t size)
 {
 	strscpy(buf, bool_names[auto_reshuffle], size);
@@ -1461,6 +1477,7 @@ static const struct {
 	DT(auto_expand_albums_follow)
 	DT(auto_expand_albums_search)
 	DT(auto_expand_albums_selcur)
+	DT(auto_hide_playlists_panel)
 	DT(show_all_tracks)
 	DT(show_current_bitrate)
 	DT(show_playback_position)

options.h

@@ -134,6 +134,7 @@ extern char *server_password;
 extern int auto_expand_albums_follow;
 extern int auto_expand_albums_search;
 extern int auto_expand_albums_selcur;
+extern int auto_hide_playlists_panel;
 extern int show_all_tracks;
 extern int auto_reshuffle;
 extern int confirm_run;

pl.c

@@ -574,6 +574,12 @@ void pl_init(void)
 	pl_searchable = searchable_new(NULL, &iter, &pl_searchable_ops);
 }
 
+void pl_init_options(void)
+{
+	if (auto_hide_playlists_panel)
+		pl_cursor_in_track_window = 1;
+}
+
 void pl_exit(void)
 {
 	pl_save_all();
@@ -864,6 +870,16 @@ void pl_set_nr_rows(int h)
 	window_set_nr_rows(pl_editable_shared.win, h);
 }
 
+bool pl_show_panel(void)
+{
+	return !auto_hide_playlists_panel || !pl_cursor_in_track_window;
+}
+
+char *pl_visible_get_name(void)
+{
+	return pl_visible->name;
+}
+
 unsigned int pl_visible_total_time(void)
 {
 	return pl_visible->editable.total_time;

pl.h

@@ -36,6 +36,7 @@ extern struct window *pl_list_win;
 extern struct editable_shared pl_editable_shared;
 
 void pl_init(void);
+void pl_init_options(void);
 void pl_exit(void);
 void pl_save(void);
 void pl_import(const char *path);
@@ -58,6 +59,8 @@ int pl_for_each_sel(track_info_cb cb, void *data, int reverse, int advance);
 void pl_reload_visible(void);
 struct window *pl_cursor_win(void);
 void pl_set_nr_rows(int h);
+bool pl_show_panel(void);
+char *pl_visible_get_name(void);
 unsigned int pl_visible_total_time(void);
 unsigned int pl_playing_total_time(void);
 struct simple_track *pl_get_playing_track(void);

ui_curses.c

@@ -976,9 +976,23 @@ static void print_pl_list(struct window *win, int row, struct iter *iter)
 	dump_print_buffer(row + 1, 0);
 }
 
+static void draw_separator(void)
+{
+	int row;
+
+	bkgdset(pairs[CURSED_WIN_TITLE]);
+	(void) mvaddch(0, tree_win_w, ' ');
+	bkgdset(pairs[CURSED_SEPARATOR]);
+	for (row = 1; row < LINES - 3; row++)
+		(void) mvaddch(row, tree_win_w, ACS_VLINE);
+}
+
 static void update_pl_list(struct window *win)
 {
-	update_window(win, tree_win_x, 0, tree_win_w + 1, "Playlist", print_pl_list);
+	if (pl_show_panel()) {
+		update_window(win, tree_win_x, 0, tree_win_w + 1, "Playlist", print_pl_list);
+		draw_separator();
+	}
 }
 
 static void update_pl_tracks(struct window *win)
@@ -987,15 +1001,25 @@ static void update_pl_tracks(struct window *win)
 	gbuf_clear(&title);
 	int win_w_tmp = win_w;
 
-	win_x = track_win_x;
-	win_w = track_win_w;
+	if (pl_show_panel()) {
+		win_x = track_win_x;
+		win_w = track_win_w;
+	} else {
+		win_x = 0;
+		win_w = tree_win_w + 1 + track_win_w;
+	}
 	win_active = pl_get_cursor_in_track_window();
 
 	get_global_fopts();
 	fopt_set_time(&track_fopts[TF_TOTAL], pl_visible_total_time(), 0);
 
-	format_print(&title, track_win_w - 2, "Track%= %{total}", track_fopts);
-	update_window(win, track_win_x, 0, track_win_w, title.buffer, print_editable);
+	if (pl_show_panel()) {
+		format_print(&title, win_w - 2, "Track%= %{total}", track_fopts);
+	} else {
+		fopt_set_str(&track_fopts[TF_TITLE], pl_visible_get_name());
+		format_print(&title, win_w - 2, "Playlist - %{title}%= %{total}", track_fopts);
+	}
+	update_window(win, win_x, 0, win_w, title.buffer, print_editable);
 
 	win_active = 1;
 	win_x = 0;
@@ -1088,22 +1112,10 @@ static void update_help_window(void)
 	update_window(help_win, 0, 0, win_w, "Settings", print_help);
 }
 
-static void draw_separator(void)
-{
-	int row;
-
-	bkgdset(pairs[CURSED_WIN_TITLE]);
-	(void) mvaddch(0, tree_win_w, ' ');
-	bkgdset(pairs[CURSED_SEPARATOR]);
-	for (row = 1; row < LINES - 3; row++)
-		(void) mvaddch(row, tree_win_w, ACS_VLINE);
-}
-
 static void update_pl_view(int full)
 {
 	current_track = pl_get_playing_track();
 	pl_draw(update_pl_list, update_pl_tracks, full);
-	draw_separator();
 }
 
 static void do_update_view(int full)
@@ -2345,6 +2357,7 @@ static void init_all(void)
 
 	/* almost everything must be initialized now */
 	options_load();
+	pl_init_options();
 	if (mpris)
 		mpris_init();