input/cmd: add nonrepeatable prefix

This allows forcing certain commands to be non-repeatable, e.g. volume.

DOCS/interface-changes/cmd-nonrepeatable.txt

@@ -0,0 +1 @@
+add `nonrepeatable` input command prefix

DOCS/man/input.rst

@@ -1818,6 +1818,9 @@ prefixes can be specified. They are separated by whitespace.
     This prefix forces enabling key repeat in any case. For a list of commands:
     the first command determines the repeatability of the whole list (up to and
     including version 0.33 - a list was always repeatable).
+``nonrepeatable``
+    For some commands, keeping a key pressed runs the command repeatedly.
+    This prefix forces disabling key repeat in any case.
 ``async``
     Allow asynchronous execution (if possible). Note that only a few commands
     will support this (usually this is explicitly documented). Some commands

input/cmd.c

@@ -51,9 +51,10 @@ static const struct flag cmd_flags[] = {
     {"osd-auto",            MP_ON_OSD_FLAGS, MP_ON_OSD_AUTO},
     {"expand-properties",   0,               MP_EXPAND_PROPERTIES},
     {"raw",                 MP_EXPAND_PROPERTIES, 0},
-    {"repeatable",          0,               MP_ALLOW_REPEAT},
+    {"repeatable",          MP_DISALLOW_REPEAT, MP_ALLOW_REPEAT},
+    {"nonrepeatable",       MP_ALLOW_REPEAT,    MP_DISALLOW_REPEAT},
     {"async",               MP_SYNC_CMD,     MP_ASYNC_CMD},
-    {"sync",                MP_ASYNC_CMD,     MP_SYNC_CMD},
+    {"sync",                MP_ASYNC_CMD,    MP_SYNC_CMD},
     {0}
 };
 
@@ -611,7 +612,8 @@ bool mp_input_is_repeatable_cmd(struct mp_cmd *cmd)
     if (cmd->def == &mp_cmd_list && cmd->args[0].v.p)
         cmd = cmd->args[0].v.p;  // list - only 1st cmd is considered
 
-    return (cmd->def->allow_auto_repeat) || (cmd->flags & MP_ALLOW_REPEAT);
+    return (cmd->def->allow_auto_repeat && !(cmd->flags & MP_DISALLOW_REPEAT)) ||
+           (cmd->flags & MP_ALLOW_REPEAT);
 }
 
 bool mp_input_is_scalable_cmd(struct mp_cmd *cmd)

input/cmd.h

@@ -75,6 +75,8 @@ enum mp_cmd_flags {
     MP_ASYNC_CMD = 32,          // do not wait for command to complete
     MP_SYNC_CMD = 64,           // block on command completion
 
+    MP_DISALLOW_REPEAT = 128,   // if used as keybinding, disallow key repeat
+
     MP_ON_OSD_FLAGS = MP_ON_OSD_NO | MP_ON_OSD_AUTO |
                       MP_ON_OSD_BAR | MP_ON_OSD_MSG,
 };