Spawning new terminal with --config from parent instance

Reference: https://codeberg.org/dnkl/foot/issues/1622
Signed-off-by: Stéphane Klein <contact@stephane-klein.info>

CHANGELOG.md

@@ -78,9 +78,12 @@
 * `[colors-light]` section to `foot.ini`. Replaces `[colors2]`.
 * `XTGETTCAP`: added `query-os-name`, returning the OS foot is
   compiled for (e.g. _'Linux'_) ([#2209][2209]).
+* `--config=PATH` option is now automatically passed to new
+  terminals spawned via `spawn-terminal` action ([#2259][2259]).
 
 [2212]: https://codeberg.org/dnkl/foot/issues/2212
 [2209]: https://codeberg.org/dnkl/foot/issues/2209
+[2259]: https://codeberg.org/dnkl/foot/pulls/2259
 
 
 ### Changed

config.c

@@ -3442,6 +3442,7 @@ config_load(struct config *conf, const char *conf_path,
     enum fcft_capabilities fcft_caps = fcft_capabilities();
 
     *conf = (struct config) {
+        .conf_path = (conf_path ? xstrdup(conf_path) : NULL),
         .term = xstrdup(FOOT_DEFAULT_TERM),
         .shell = get_shell(),
         .title = xstrdup("foot"),
@@ -3895,6 +3896,7 @@ config_clone(const struct config *old)
     struct config *conf = xmalloc(sizeof(*conf));
     *conf = *old;
 
+    conf->conf_path = (old->conf_path ? xstrdup(old->conf_path) : NULL);
     conf->term = xstrdup(old->term);
     conf->shell = xstrdup(old->shell);
     conf->title = xstrdup(old->title);
@@ -3995,6 +3997,7 @@ UNITTEST
 void
 config_free(struct config *conf)
 {
+    free(conf->conf_path);
     free(conf->term);
     free(conf->shell);
     free(conf->title);

config.h

@@ -217,6 +217,7 @@ enum center_when {
 };
 
 struct config {
+    char *conf_path;
     char *term;
     char *shell;
     char *title;

doc/foot.1.scd

@@ -27,6 +27,9 @@ the foot command line
 *-c*,*--config*=_PATH_
 	Path to configuration file, see *foot.ini*(5) for details.
 
+	The configuration file is automatically passed to new terminals
+	spawned via *spawn-terminal* (see *foot.ini*(5)).
+
 *-C*,*--check-config*
 	Verify configuration and then exit with 0 if ok, otherwise exit
 	with 230 (see *EXIT STATUS*).

terminal.c

@@ -3802,8 +3802,18 @@ term_bell(struct terminal *term)
 bool
 term_spawn_new(const struct terminal *term)
 {
+    char *argv[4];
+    int argc = 0;
+
+    argv[argc++] = term->foot_exe;
+    if (term->conf->conf_path != NULL) {
+        argv[argc++] = "--config";
+        argv[argc++] = term->conf->conf_path;
+    }
+    argv[argc] = NULL;
+
     return spawn(
-        term->reaper, term->cwd, (char *const []){term->foot_exe, NULL},
+        term->reaper, term->cwd, argv,
         -1, -1, -1, NULL, NULL, NULL) >= 0;
 }