[hitori/13-localised-board: 2/2] interface: Support localised cell text

[Philip Withnall <pwithnall src gnome org>]

commit 3004fb9a1e7ce8f9b92126a2f0dc29d1f3ca043d
Author: Philip Withnall <withnall endlessm com>
Date:   Tue Mar 5 13:36:09 2019 +0000

    interface: Support localised cell text
    
    This should allow translators to choose whether to display the game
    board in their local numerals, or in the default Arabic numerals.
    
    Signed-off-by: Philip Withnall <withnall endlessm com>
    
    Fixes: #13

 src/interface.c | 35 ++++++++++++++++++++++++++++++++---
 1 file changed, 32 insertions(+), 3 deletions(-)
---
diff --git a/src/interface.c b/src/interface.c
index 1e15d4a..492018b 100644
--- a/src/interface.c
+++ b/src/interface.c
@@ -131,11 +131,41 @@ lookup_color (GtkStyleContext *style_context, const gchar *name, GdkRGBA *result
        }
 }
 
+/* Generate the text for a given cell, potentially localised to the current locale. */
+static const gchar *
+localise_cell_digit (Hitori             *hitori,
+                     const HitoriVector *pos)
+{
+       guchar value = hitori->board[pos->x][pos->y].num;
+
+       G_STATIC_ASSERT (MAX_BOARD_SIZE < 11);
+
+       switch (value) {
+       /* Translators: This is a digit rendered in a cell on the game board.
+        * Translate it to your locale’s number system if you wish the game
+        * board to be rendered in those digits. Otherwise, leave the digits as
+        * Arabic numerals. */
+       case 1: return C_("Board cell", "1");
+       case 2: return C_("Board cell", "2");
+       case 3: return C_("Board cell", "3");
+       case 4: return C_("Board cell", "4");
+       case 5: return C_("Board cell", "5");
+       case 6: return C_("Board cell", "6");
+       case 7: return C_("Board cell", "7");
+       case 8: return C_("Board cell", "8");
+       case 9: return C_("Board cell", "9");
+       case 10: return C_("Board cell", "10");
+       case 11: return C_("Board cell", "11");
+       default:
+               g_assert_not_reached ();
+       }
+}
+
 static void
 draw_cell (Hitori *hitori, GtkStyleContext *style_context, cairo_t *cr, gdouble cell_size, gdouble x_pos, 
gdouble y_pos,
            HitoriVector iter)
 {
-       gchar *text;
+       const gchar *text;
        PangoLayout *layout;
        gint text_width, text_height;
        GtkStateFlags state;
@@ -214,7 +244,7 @@ draw_cell (Hitori *hitori, GtkStyleContext *style_context, cairo_t *cr, gdouble
        cairo_stroke (cr);
 
        /* Draw the text */
-       text = g_strdup_printf ("%u", hitori->board[iter.x][iter.y].num);
+       text = localise_cell_digit (hitori, &iter);
        layout = pango_cairo_create_layout (cr);
 
        pango_layout_set_text (layout, text, -1);
@@ -245,7 +275,6 @@ draw_cell (Hitori *hitori, GtkStyleContext *style_context, cairo_t *cr, gdouble
 
        pango_cairo_show_layout (cr, layout);
 
-       g_free (text);
        g_object_unref (layout);
 }