Split the UI code into multiple files

util.c

@@ -0,0 +1,99 @@
+#include "maturita.h"
+
+/* ------------------------------------------------------------------ */
+/* Utilities                                                          */
+/* ------------------------------------------------------------------ */
+
+char *normalize_answer(const char *input) {
+    GString *out = g_string_new(NULL);
+    const gchar *down = g_utf8_strdown(input, -1);
+    const gchar *p = down;
+    gboolean prev_space = FALSE;
+
+    while (*p) {
+        gunichar ch = g_utf8_get_char(p);
+        p = g_utf8_next_char(p);
+        if (g_unichar_isspace(ch)) {
+            if (out->len > 0 && !prev_space)
+                g_string_append_c(out, ' ');
+            prev_space = TRUE;
+            continue;
+        }
+        prev_space = FALSE;
+        switch (ch) {
+            case 0x00e4: g_string_append(out, "ae"); break; /* ä */
+            case 0x00f6: g_string_append(out, "oe"); break; /* ö */
+            case 0x00fc: g_string_append(out, "ue"); break; /* ü */
+            case 0x00df: g_string_append(out, "ss"); break; /* ß */
+            default:     g_string_append_unichar(out, ch); break;
+        }
+    }
+
+    if (out->len > 0 && out->str[out->len - 1] == ' ')
+        g_string_truncate(out, out->len - 1);
+
+    g_free((gpointer)down);
+    return g_string_free(out, FALSE);
+}
+
+void shuffle_indices(int *arr, int n) {
+    for (int i = n - 1; i > 0; i--) {
+        int j = g_random_int_range(0, i + 1);
+        int tmp = arr[i];
+        arr[i] = arr[j];
+        arr[j] = tmp;
+    }
+}
+
+void flow_clear(GtkFlowBox *fb) {
+    GtkWidget *c = gtk_widget_get_first_child(GTK_WIDGET(fb));
+    while (c) {
+        GtkWidget *next = gtk_widget_get_next_sibling(c);
+        gtk_flow_box_remove(fb, c);
+        c = next;
+    }
+}
+
+void answer_mark(GtkWidget *widget, gboolean ok) {
+    if (ok) {
+        gtk_widget_remove_css_class(widget, "answer-wrong");
+        gtk_widget_add_css_class(widget, "answer-ok");
+    } else {
+        gtk_widget_remove_css_class(widget, "answer-ok");
+        gtk_widget_add_css_class(widget, "answer-wrong");
+    }
+}
+
+void set_feedback(GtkWidget *label, gboolean ok, const char *text) {
+    gtk_widget_remove_css_class(label, "feedback-ok");
+    gtk_widget_remove_css_class(label, "feedback-err");
+    gtk_widget_add_css_class(label, ok ? "feedback-ok" : "feedback-err");
+    gtk_label_set_text(GTK_LABEL(label), text);
+}
+
+/* True if `s` contains any German special letter (ä, ö, ü or ß). */
+gboolean text_has_german_umlaut(const char *s) {
+    const char *p = s ? s : "";
+
+    while (*p) {
+        gunichar c = g_utf8_get_char(p);
+
+        if (c == 0x00e4 || c == 0x00f6 || c == 0x00fc || c == 0x00df)
+            return TRUE;
+        p = g_utf8_next_char(p);
+    }
+    return FALSE;
+}
+
+/* Small bilingual note shown under the exercise title whenever the answer
+ * the student has to type may contain a German special letter. */
+void add_umlaut_note(GtkWidget *body) {
+    GtkWidget *n = gtk_label_new(NULL);
+
+    i18n_bind(n, "hint_umlauts", 0);
+    gtk_widget_set_halign(n, GTK_ALIGN_START);
+    gtk_label_set_wrap(GTK_LABEL(n), TRUE);
+    gtk_widget_set_margin_bottom(n, 2);
+    gtk_widget_add_css_class(n, "hint");
+    gtk_box_append(GTK_BOX(body), n);
+}