command: add property indicating per-file options

Fixes #2165, more or less.

DOCS/interface-changes.rst

@@ -20,6 +20,7 @@ Interface changes
 ::
 
  --- mpv 0.10.0 will be released ---
+    - add "option-info/<name>/set-locally" property
     - add --cache-backbuffer; change --cache-default default to 75MB
       the new total cache size is the sum of backbuffer and the cache size
       specified by --cache-default or --cache

DOCS/man/input.rst

@@ -1872,6 +1872,12 @@ Property list
         ``no`` otherwise. What this is set to if the option is e.g. changed
         at runtime is left undefined (meaning it could change in the future).
 
+    ``option-info/<name>/set-locally``
+        Return ``yes`` if the option was set per-file. This is the case with
+        automatically loaded profiles, file-dir configs, and other cases. It
+        means the option value will be restored to the value before playback
+        start when playback ends.
+
     ``option-info/<name>/default-value``
         The default value of the option. May not always be available.
 

options/m_config.c

@@ -272,6 +272,7 @@ static void ensure_backup(struct m_config *config, struct m_config_option *co)
     m_option_copy(co->opt, bc->backup, co->data);
     bc->next = config->backup_opts;
     config->backup_opts = bc;
+    co->is_set_locally = true;
 }
 
 void m_config_restore_backups(struct m_config *config)
@@ -282,6 +283,7 @@ void m_config_restore_backups(struct m_config *config)
 
         m_option_copy(bc->co->opt, bc->co->data, bc->backup);
         m_option_free(bc->co->opt, bc->backup);
+        bc->co->is_set_locally = false;
         talloc_free(bc);
     }
 }

options/m_config.h

@@ -39,6 +39,7 @@ struct mp_log;
 struct m_config_option {
     bool is_generated : 1;          // Automatically added ("no-" options)
     bool is_set_from_cmdline : 1;   // Set by user from command line
+    bool is_set_locally : 1;        // Has a backup entry
     bool warning_was_printed : 1;
     const char *name;               // Full name (ie option-subopt)
     const struct m_option *opt;     // Option description

player/command.c

@@ -3261,6 +3261,7 @@ static int mp_property_option_info(void *ctx, struct m_property *prop,
             {"name",                    SUB_PROP_STR(co->name)},
             {"type",                    SUB_PROP_STR(opt->type->name)},
             {"set-from-commandline",    SUB_PROP_FLAG(co->is_set_from_cmdline)},
+            {"set-locally",             SUB_PROP_FLAG(co->is_set_locally)},
             {"default-value",           *opt, def},
             {"min",                     SUB_PROP_DOUBLE(opt->min),
              .unavailable = !(has_minmax && (opt->flags & M_OPT_MIN))},