command: add commands to enable/disable input sections

For now, it's mostly for testing. It also might allow to create key
binding state machines, but this sounds questionable.

DOCS/man/en/input.rst

@@ -266,6 +266,21 @@ vf set|add|toggle|del "filter1=params,filter2,..."
     - ``b vf set ""`` remove all video filters on ``b``
     - ``c vf toggle lavfi=gradfun`` toggle debanding on ``c``
 
+enable_section "<section>" [default|exclusive]
+    Enable all key bindings in the named input section.
+
+    The enabled input sections form a stack. Bindings in sections on the top of
+    the stack are preferred to lower sections. This command puts the section
+    on top of the stack. If the section was already on the stack, it's
+    implicitly removed beforehand. (A section can't be on the stack twice.)
+
+    If ``exclusive`` is specified as second argument, all sections below the
+    newly enabled section are disabled. They will be re-enabled as soon as
+    all exclusive above them are removed.
+
+disable_section "<section>"
+    Disable the named input section. Undoes ``enable_section``.
+
 Undocumented commands: tv_start_scan, tv_step_channel, tv_step_norm,
 tv_step_chanlist, tv_set_channel, tv_last_channel, tv_set_freq, tv_step_freq,
 tv_set_norm, dvb_set_channel, radio_step_channel, radio_set_channel,

core/command.c

@@ -2412,6 +2412,15 @@ void run_command(MPContext *mpctx, mp_cmd_t *cmd)
         mplayer_put_key(mpctx->key_fifo, cmd->args[0].v.i);
         break;
 
+    case MP_CMD_ENABLE_INPUT_SECTION:
+        mp_input_enable_section(mpctx->input, cmd->args[0].v.s,
+                                cmd->args[1].v.i == 1 ? MP_INPUT_EXCLUSIVE : 0);
+        break;
+
+    case MP_CMD_DISABLE_INPUT_SECTION:
+        mp_input_disable_section(mpctx->input, cmd->args[0].v.s);
+        break;
+
     case MP_CMD_VO_CMDLINE:
         if (mpctx->video_out) {
             char *s = cmd->args[0].v.s;

core/input/input.c

@@ -194,6 +194,13 @@ static const mp_cmd_t mp_cmds[] = {
         .v.f = 1 },
   }},
 
+  { MP_CMD_ENABLE_INPUT_SECTION,  "enable_section",  {
+      ARG_STRING,
+      OARG_CHOICE(0, ({"default", 0},
+                      {"exclusive", 1})),
+  }},
+  { MP_CMD_DISABLE_INPUT_SECTION, "disable_section", { ARG_STRING } },
+
   { MP_CMD_AF_SWITCH, "af_switch", { ARG_STRING } },
   { MP_CMD_AF_ADD, "af_add", { ARG_STRING } },
   { MP_CMD_AF_DEL, "af_del", { ARG_STRING } },

core/input/input.h

@@ -67,6 +67,9 @@ enum mp_command_type {
     MP_CMD_TV_START_SCAN,
     MP_CMD_STOP,
 
+    MP_CMD_ENABLE_INPUT_SECTION,
+    MP_CMD_DISABLE_INPUT_SECTION,
+
     /// DVB commands
     MP_CMD_DVB_SET_CHANNEL = 5101,