command: add escape-ass

This adds a command to escape ASS tags to remove code duplication
between sub/osd_libass.c, console.lua, osc.lua, stats.lua and any user
script that calls mp.create_osd_overlay().

A command is used instead of scripting functions so that all clients can
use this and not just use Lua and JS ones.

osd_mangle_ass() also interprets osd-sym-cc and osd-ass-cc/{0,1}, but
since they use invalid UTF-8 characters there is no risk of escape-ass
users using them by accident, like with any OSD message.

Always replacing \n with \\N in mangle_ass() even when it is not called
by escape-ass doesn't seem to cause any issue, but I made it conditional
anyway to avoid changing how all OSD messages are treated unnecessarily.

1 files changed, 15 insertions, 0 deletions

diff --git a/player/command.c b/player/command.c
index 27fadf91b1..ce7d6d5541 100644
--- a/player/command.c
+++ b/player/command.c
@@ -5582,6 +5582,19 @@ static void cmd_expand_path(void *p)
     };
 }
 
+static void cmd_escape_ass(void *p)
+{
+    struct mp_cmd_ctx *cmd = p;
+    bstr dst = {0};
+
+    osd_mangle_ass(&dst, cmd->args[0].v.s, true);
+
+    cmd->result = (mpv_node){
+        .format = MPV_FORMAT_STRING,
+        .u.string = dst.len ? (char *)dst.start : talloc_strdup(NULL, ""),
+    };
+}
+
 static struct load_action get_load_action(struct MPContext *mpctx, int action_flag)
 {
     switch (action_flag) {
@@ -6679,6 +6692,8 @@ const struct mp_cmd_def mp_cmds[] = {
         .is_noisy = true },
     { "expand-path", cmd_expand_path, { {"text", OPT_STRING(v.s)} },
         .is_noisy = true },
+    { "escape-ass", cmd_escape_ass, { {"text", OPT_STRING(v.s)} },
+        .is_noisy = true },
     { "show-progress", cmd_show_progress, .allow_auto_repeat = true,
         .is_noisy = true },