config: add initial-color-theme=1|2

This option selects which color theme to use by default. I.e. at
startup, and after a reset.

This is useful with combined theme files, where a single file defines
e.g. both a dark and light version of the theme.

CHANGELOG.md

@@ -74,6 +74,8 @@
 * Support for private mode 2031 - [_Dark and Light Mode
   Detection_](https://contour-terminal.org/vt-extensions/color-palette-update-notifications/)
   ([#2025][2025])
+* Added `initial-color-theme=1|2` config option. `1` uses colors from
+  the `[colors]` section, `2` uses `[colors2]`.
 
 [2025]: https://codeberg.org/dnkl/foot/issues/2025
 

config.c

@@ -1098,6 +1098,15 @@ parse_section_main(struct context *ctx)
         return true;
     }
 
+    else if (streq(key, "initial-color-theme")) {
+        _Static_assert(
+            sizeof(conf->initial_color_theme) == sizeof(int),
+            "enum is not 32-bit");
+
+        return value_to_enum(ctx, (const char*[]){"1", "2", NULL},
+                             (int *)&conf->initial_color_theme);
+    }
+
     else {
         LOG_CONTEXTUAL_ERR("not a valid option: %s", key);
         return false;
@@ -3402,7 +3411,7 @@ config_load(struct config *conf, const char *conf_path,
                 .url = false,
             },
         },
-
+        .initial_color_theme = COLOR_THEME1,
         .cursor = {
             .style = CURSOR_BLOCK,
             .unfocused_style = CURSOR_UNFOCUSED_HOLLOW,

config.h

@@ -190,6 +190,11 @@ struct color_theme {
     } use_custom;
 };
 
+enum which_color_theme {
+    COLOR_THEME1,
+    COLOR_THEME2,
+};
+
 struct config {
     char *term;
     char *shell;
@@ -305,6 +310,7 @@ struct config {
 
     struct color_theme colors;
     struct color_theme colors2;
+    enum which_color_theme initial_color_theme;
 
     struct {
         enum cursor_style style;

doc/foot.ini.5.scd

@@ -349,6 +349,18 @@ empty string to be set, but it must be quoted: *KEY=""*)
 
 	Default: _yes_
 
+*initial-color-theme*
+	Selects which color theme to use, *1*, or *2*.
+	
+	*1* uses the colors defined in the *colors* section, while *2*
+	uses the colors from the *colors2* section.
+	
+	Use the *color-theme-switch-1*, *color-theme-switch-2* and
+	*color-theme-toggle* key bindings to switch between the two themes
+	at runtime.
+	
+	Default: _1_
+
 *initial-window-size-pixels*
 	Initial window width and height in _pixels_ (subject to output
 	scaling), in the form _WIDTHxHEIGHT_. The height _includes_ the

foot.ini

@@ -23,6 +23,7 @@
 # box-drawings-uses-font-glyphs=no
 # dpi-aware=no
 
+# initial-color-theme=1
 # initial-window-size-pixels=700x500  # Or,
 # initial-window-size-chars=<COLSxROWS>
 # initial-window-mode=windowed

terminal.c

@@ -1262,6 +1262,12 @@ term_init(const struct config *conf, struct fdm *fdm, struct reaper *reaper,
 
     const bool ten_bit_surfaces = conf->tweak.surface_bit_depth == SHM_10_BIT;
 
+    const struct color_theme *theme = NULL;
+    switch (conf->initial_color_theme) {
+    case COLOR_THEME1: theme = &conf->colors; break;
+    case COLOR_THEME2: theme = &conf->colors2; break;
+    }
+
     /* Initialize configure-based terminal attributes */
     *term = (struct terminal) {
         .fdm = fdm,
@@ -1279,7 +1285,7 @@ term_init(const struct config *conf, struct fdm *fdm, struct reaper *reaper,
         },
         .font_dpi = 0.,
         .font_dpi_before_unmap = -1.,
-        .font_subpixel = (conf->colors.alpha == 0xffff  /* Can't do subpixel rendering on transparent background */
+        .font_subpixel = (theme->alpha == 0xffff  /* Can't do subpixel rendering on transparent background */
                           ? FCFT_SUBPIXEL_DEFAULT
                           : FCFT_SUBPIXEL_NONE),
         .cursor_keys_mode = CURSOR_KEYS_NORMAL,
@@ -1295,15 +1301,15 @@ term_init(const struct config *conf, struct fdm *fdm, struct reaper *reaper,
             .state = 0,  /* STATE_GROUND */
         },
         .colors = {
-            .fg = conf->colors.fg,
-            .bg = conf->colors.bg,
-            .alpha = conf->colors.alpha,
-            .cursor_fg = (conf->colors.use_custom.cursor ? 1u << 31 : 0) | conf->colors.cursor.text,
-            .cursor_bg = (conf->colors.use_custom.cursor ? 1u << 31 : 0) | conf->colors.cursor.cursor,
-            .selection_fg = conf->colors.selection_fg,
-            .selection_bg = conf->colors.selection_bg,
-            .use_custom_selection = conf->colors.use_custom.selection,
-            .active_theme = COLOR_THEME1,
+            .fg = theme->fg,
+            .bg = theme->bg,
+            .alpha = theme->alpha,
+            .cursor_fg = (theme->use_custom.cursor ? 1u << 31 : 0) | theme->cursor.text,
+            .cursor_bg = (theme->use_custom.cursor ? 1u << 31 : 0) | theme->cursor.cursor,
+            .selection_fg = theme->selection_fg,
+            .selection_bg = theme->selection_bg,
+            .use_custom_selection = theme->use_custom.selection,
+            .active_theme = conf->initial_color_theme,
         },
         .color_stack = {
             .stack = NULL,
@@ -1434,7 +1440,7 @@ term_init(const struct config *conf, struct fdm *fdm, struct reaper *reaper,
     xassert(tll_length(term->wl->monitors) > 0);
     term->scale = tll_front(term->wl->monitors).scale;
 
-    memcpy(term->colors.table, term->conf->colors.table, sizeof(term->colors.table));
+    memcpy(term->colors.table, theme->table, sizeof(term->colors.table));
 
     /* Initialize the Wayland window backend */
     if ((term->window = wayl_win_init(term, token)) == NULL)
@@ -2148,11 +2154,18 @@ term_reset(struct terminal *term, bool hard)
     if (!hard)
         return;
 
+    const struct color_theme *theme = NULL;
+
+    switch (term->conf->initial_color_theme) {
+    case COLOR_THEME1: theme = &term->conf->colors; break;
+    case COLOR_THEME2: theme = &term->conf->colors2; break;
+    }
+
     term->flash.active = false;
     term->blink.state = BLINK_ON;
     fdm_del(term->fdm, term->blink.fd); term->blink.fd = -1;
-    term_theme_apply(term, &term->conf->colors);
-    term->colors.active_theme = COLOR_THEME1;
+    term_theme_apply(term, theme);
+    term->colors.active_theme = term->conf->initial_color_theme;
     free(term->color_stack.stack);
     term->color_stack.stack = NULL;
     term->color_stack.size = 0;

terminal.h

@@ -405,7 +405,7 @@ struct colors {
     uint32_t selection_fg;
     uint32_t selection_bg;
     bool use_custom_selection;
-    enum { COLOR_THEME1, COLOR_THEME2 } active_theme;
+    enum which_color_theme active_theme;
 };
 
 struct terminal {