select.lua: add this script

This adds script messages to select playlist entries, tracks, chapters,
subtitle lines, bindings and properties using the newly introduced
mp.input.select().

This fully closes mpv-player#13964.

DOCS/man/mpv.rst

@@ -270,6 +270,46 @@ Alt+2 (and Command+2 on macOS)
 Command + f (macOS only)
     Toggle fullscreen (see also ``--fs``).
 
+(The following keybindings open a selector in the console that lets you choose
+from a list of items by typing part of the desired item and/or by navigating
+them with keybindings: ``Down`` and ``Ctrl+n`` go down, ``Up`` and ``Ctrl+p`` go
+up, ``Page down`` and ``Ctrl+f`` scroll down one page, and ``Page up`` and
+``Ctrl+b`` scroll up one page.)
+
+g-p
+    Select a playlist entry.
+
+g-s
+    Select a subtitle track.
+
+g-S
+    Select a secondary subtitle track.
+
+g-a
+    Select an audio track.
+
+g-v
+    Select a video track.
+
+g-t
+    Select a track of any type.
+
+g-c
+    Select a chapter.
+
+g-l
+    Select a subtitle line to seek to. This currently requires ``ffmpeg`` in
+    ``PATH``, or in the same folder as mpv on Windows.
+
+g-d
+    Select an audio device.
+
+g-b
+    Select a defined input binding.
+
+g-r
+    Show the values of all properties.
+
 (The following keys are valid if you have a keyboard with multimedia keys.)
 
 PAUSE

DOCS/man/options.rst

@@ -1023,6 +1023,10 @@ Program Behavior
     `Conditional auto profiles`_ for details. ``auto`` will load the script,
     but immediately unload it if there are no conditional profiles.
 
+``--load-select=<yes|no>``
+    Enable the builtin script that lets you select from lists of items (default:
+    yes). By default, its keybindings start with the ``g`` key.
+
 ``--player-operation-mode=<cplayer|pseudo-gui>``
     For enabling "pseudo GUI mode", which means that the defaults for some
     options are changed. This option should not normally be used directly, but

etc/input.conf

@@ -168,6 +168,18 @@
 #ctrl+h cycle-values hwdec "auto-safe" "no"  # toggle hardware decoding
 #F8 show-text ${playlist}               # show the playlist
 #F9 show-text ${track-list}             # show the list of video, audio and sub tracks
+#g ignore
+#g-p script-binding select/select-playlist
+#g-s script-binding select/select-sid
+#g-S script-binding select/select-secondary-sid
+#g-a script-binding select/select-aid
+#g-v script-binding select/select-vid
+#g-t script-binding select/select-track
+#g-c script-binding select/select-chapter
+#g-l script-binding select/select-subtitle-line
+#g-d script-binding select/select-audio-device
+#g-b script-binding select/select-binding
+#g-r script-binding select/show-properties
 
 #
 # Legacy bindings (may or may not be removed in the future)

options/options.c

@@ -547,6 +547,7 @@ static const m_option_t mp_opts[] = {
     {"load-auto-profiles",
         OPT_CHOICE(lua_load_auto_profiles, {"no", 0}, {"yes", 1}, {"auto", -1}),
         .flags = UPDATE_BUILTIN_SCRIPTS},
+    {"load-select", OPT_BOOL(lua_load_select), .flags = UPDATE_BUILTIN_SCRIPTS},
 #endif
 
 // ------------------------- stream options --------------------
@@ -969,6 +970,7 @@ static const struct MPOpts mp_default_opts = {
     .lua_load_stats = true,
     .lua_load_console = true,
     .lua_load_auto_profiles = -1,
+    .lua_load_select = true,
 #endif
     .auto_load_scripts = true,
     .loop_times = 1,

options/options.h

@@ -175,6 +175,7 @@ typedef struct MPOpts {
     bool lua_load_stats;
     bool lua_load_console;
     int lua_load_auto_profiles;
+    bool lua_load_select;
 
     bool auto_load_scripts;
 

player/core.h

@@ -436,7 +436,7 @@ typedef struct MPContext {
 
     struct mp_ipc_ctx *ipc_ctx;
 
-    int64_t builtin_script_ids[5];
+    int64_t builtin_script_ids[6];
 
     mp_mutex abort_lock;
 

player/lua.c

@@ -81,6 +81,9 @@ static const char * const builtin_lua_scripts[][2] = {
     },
     {"@auto_profiles.lua",
 #   include "player/lua/auto_profiles.lua.inc"
+    },
+    {"@select.lua",
+#   include "player/lua/select.lua.inc"
     },
     {0}
 };

player/lua/meson.build

@@ -1,6 +1,6 @@
 lua_files = ['defaults.lua', 'assdraw.lua', 'options.lua', 'osc.lua',
              'ytdl_hook.lua', 'stats.lua', 'console.lua', 'auto_profiles.lua',
-             'input.lua', 'fzy.lua']
+             'input.lua', 'fzy.lua', 'select.lua']
 foreach file: lua_files
     lua_file = custom_target(file,
         input: join_paths(source_root, 'player', 'lua', file),