1 files changed, 55 insertions, 17 deletions

diff --git a/src/interface-gtk/gtk-label.c b/src/interface-gtk/gtk-label.c
index ef370a2..6e05045 100644
--- a/src/interface-gtk/gtk-label.c
+++ b/src/interface-gtk/gtk-label.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012-2025 Robin Haberkorn
+ * Copyright (C) 2012-2026 Robin Haberkorn
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -32,7 +32,7 @@
 
 #include "gtk-label.h"
 
-#define GDK_TO_PANGO_COLOR(X) ((guint16)((X) * G_MAXUINT16))
+#define GDK_TO_PANGO_COLOR(X)	((guint16)((X) * G_MAXUINT16))
 
 struct _TecoGtkLabel {
 	GtkLabel parent_instance;
@@ -40,7 +40,10 @@ struct _TecoGtkLabel {
 	PangoColor fg, bg;
 	guint16 fg_alpha, bg_alpha;
 
+	/** text backing the label or empty string for fallback */
 	teco_string_t string;
+	/** fallback string to render if `string` is empty or NULL */
+	const gchar *fallback;
 };
 
 G_DEFINE_TYPE(TecoGtkLabel, teco_gtk_label, GTK_TYPE_LABEL)
@@ -122,11 +125,21 @@ teco_gtk_label_class_init(TecoGtkLabelClass *klass)
 
 static void teco_gtk_label_init(TecoGtkLabel *self) {}
 
+/**
+ * Create new TECO label widget.
+ *
+ * @param str String to render (can be NULL)
+ * @param len Length of str or negative value for null-terminated strings.
+ * @param fallback Null-terminated fallback string to render
+ *   instead of empty strings.
+ *   Must be a string constant with global lifetime or NULL.
+ */
 GtkWidget *
-teco_gtk_label_new(const gchar *str, gssize len)
+teco_gtk_label_new(const gchar *str, gssize len, const gchar *fallback)
 {
 	TecoGtkLabel *widget = TECO_GTK_LABEL(g_object_new(TECO_TYPE_GTK_LABEL, NULL));
 
+	widget->fallback = fallback;
 	teco_gtk_label_set_text(widget, str, len);
 
 	return GTK_WIDGET(widget);
@@ -143,7 +156,6 @@ teco_gtk_label_add_highlight_attribs(PangoAttrList *attribs, PangoColor *fg, gui
 	 * even in Pango v1.38.
 	 * Perhaps, this has been fixed in later versions.
 	 */
-#if PANGO_VERSION_CHECK(1,38,0)
 	attr = pango_attr_foreground_alpha_new(fg_alpha);
 	attr->start_index = index;
 	attr->end_index = index + len;
@@ -153,7 +165,6 @@ teco_gtk_label_add_highlight_attribs(PangoAttrList *attribs, PangoColor *fg, gui
 	attr->start_index = index;
 	attr->end_index = index + len;
 	pango_attr_list_insert(attribs, attr);
-#endif
 
 	attr = pango_attr_foreground_new(fg->red, fg->green, fg->blue);
 	attr->start_index = index;
@@ -253,25 +264,52 @@ teco_gtk_label_set_text(TecoGtkLabel *self, const gchar *str, gssize len)
 	teco_string_clear(&self->string);
 	teco_string_init(&self->string, str, len < 0 ? strlen(str) : len);
 
+	teco_string_t string = self->string;
+	if (!string.len && self->fallback) {
+		string.data = (gchar *)self->fallback;
+		string.len = strlen(string.data);
+	}
+
 	g_autofree gchar *plaintext = NULL;
+	PangoAttrList *attribs = NULL;
 
-	if (self->string.len > 0) {
-		PangoAttrList *attribs = NULL;
+	teco_gtk_label_parse_string(string.data, string.len,
+	                            &self->fg, self->fg_alpha,
+	                            &self->bg, self->bg_alpha,
+	                            &attribs, &plaintext);
 
-		teco_gtk_label_parse_string(self->string.data, self->string.len,
-		                            &self->fg, self->fg_alpha,
-		                            &self->bg, self->bg_alpha,
-		                            &attribs, &plaintext);
-
-		gtk_label_set_attributes(GTK_LABEL(self), attribs);
-		pango_attr_list_unref(attribs);
-	}
+	gtk_label_set_attributes(GTK_LABEL(self), attribs);
+	pango_attr_list_unref(attribs);
 
 	gtk_label_set_text(GTK_LABEL(self), plaintext);
 }
 
-const teco_string_t *
+teco_string_t
 teco_gtk_label_get_text(TecoGtkLabel *self)
 {
-	return &self->string;
+	return self->string;
+}
+
+/**
+ * Signal that a keypress is expected (after executing ^T)
+ * by printing the first character in reverse.
+ *
+ * @fixme This mimics the current Curses implementation.
+ * Perhaps better show an icon?
+ */
+void
+teco_gtk_label_highlight_getch(TecoGtkLabel *self)
+{
+	const gchar *plaintext = gtk_label_get_text(GTK_LABEL(self));
+	g_assert(plaintext != NULL);
+	if (!*plaintext || !strcmp(plaintext, "\u258C")) {
+		gtk_label_set_text(GTK_LABEL(self), "\u258C");
+	} else {
+		PangoAttrList *attribs = gtk_label_get_attributes(GTK_LABEL(self));
+		teco_gtk_label_add_highlight_attribs(attribs,
+		                                     &self->fg, self->fg_alpha,
+		                                     &self->bg, self->bg_alpha,
+		                                     0, 1);
+		gtk_label_set_attributes(GTK_LABEL(self), attribs);
+	}
 }