Switch to using po/mo files for translations

As a test for now.  Would need to make sure that the speed is
acceptable.

Doing this because it makes it easier to work on the UI without having
to update the translation strings list each time I add a new label.

I am using a small custom made mo reader since I don't want to add a
dependency to gettext, and also I prefer to bundle all the translations
directly in the binary.

src/action.h

@@ -48,7 +48,7 @@ typedef struct action action_t;
 struct action {
     int             idx;
     const char      *id;            // Globally unique id.
-    int             help;           // Help text string id.
+    const char      *help;
     int             flags;
     const char      *default_shortcut;
     char            shortcut[8];    // Can be changed at runtime.

src/assets.c

@@ -55,6 +55,7 @@ static asset_t ASSETS[] = {
 #include "assets/fonts.inl"
 #include "assets/icons.inl"
 #include "assets/images.inl"
+#include "assets/locale.inl"
 #include "assets/other.inl"
 #include "assets/palettes.inl"
 #include "assets/progs.inl"

src/filters/colors.c

@@ -157,7 +157,7 @@ static int gui(filter_t *filter_)
         goxel_apply_color_filter(apply_values, filter);
     }
 
-    if (gui_button(_(RESET), -1, 0)) {
+    if (gui_button(_("Reset"), -1, 0)) {
         volume_set(layer->volume, filter->original);
         filter->hue        = 0;
         filter->lightness  = 0;

src/formats/gltf.c

@@ -444,9 +444,9 @@ static int export_as_gltf(const file_format_t *format, const image_t *img,
 
 static void export_gui(file_format_t *format)
 {
-    gui_checkbox(_(VERTEX_COLOR), &g_export_options.vertex_color,
-                 _(SAVE_COLORS_AS_VERTEX_ATTRIBUTE));
-    gui_input_float(_(SIMPLIFY), &g_export_options.simplify, 0.1,
+    gui_checkbox(_("Vertex Color"), &g_export_options.vertex_color,
+                 _("Save colors as vertex attribute"));
+    gui_input_float(_("Simplify"), &g_export_options.simplify, 0.1,
                     0, 1, "%.1f");
 }
 

src/formats/png.c

@@ -45,7 +45,7 @@ static void export_gui(file_format_t *format)
     maxsize /= 2; // Because png export already double it.
     goxel.show_export_viewport = true;
     gui_group_begin(NULL);
-    gui_checkbox(_(SIZE), &goxel.image->export_custom_size, NULL);
+    gui_checkbox(_("Size"), &goxel.image->export_custom_size, NULL);
     if (!goxel.image->export_custom_size) {
         goxel.image->export_width = goxel.gui.viewport[2];
         goxel.image->export_height = goxel.gui.viewport[3];
@@ -61,7 +61,7 @@ static void export_gui(file_format_t *format)
     gui_enabled_end();
     gui_group_end();
 
-    gui_checkbox(_(TRANSPARENT_BACKGROUND),
+    gui_checkbox(_("Transparent Background"),
                  &goxel.image->export_transparent_background,
                  NULL);
 }

src/formats/wavefront.c

@@ -231,7 +231,7 @@ int ply_export(const file_format_t *format, const image_t *image,
 
 static void export_gui(file_format_t *format)
 {
-    gui_checkbox(_(Y_UP), &g_export_options.y_up, _(USE_Y_UP_CONVENTION));
+    gui_checkbox(_("Y Up"), &g_export_options.y_up, _("Use +Y up convention"));
 }
 
 static void get_file_data(void *ctx, const char *filename, const int is_mtl,

src/goxel.c

@@ -1572,7 +1572,7 @@ static void a_cut_as_new_layer(void)
 }
 
 ACTION_REGISTER(ACTION_cut_as_new_layer,
-    .help = STR_ACTION_CUT_AS_NEW_LAYER,
+    .help = N_("Cuts the selected area into a new layer"),
     .cfunc = a_cut_as_new_layer,
     .flags = ACTION_TOUCH_IMAGE,
 )
@@ -1600,7 +1600,7 @@ static void a_fill_selection_box(void)
 }
 
 ACTION_REGISTER(ACTION_fill_selection_box,
-    .help = STR_ACTION_FILL_SELECTION_BOX_HELP,
+    .help = N_("Fills the selected box with the current color"),
     .cfunc = a_fill_selection_box,
     .flags = ACTION_TOUCH_IMAGE,
 )
@@ -1615,7 +1615,7 @@ static void a_paint_selection(void)
 }
 
 ACTION_REGISTER(ACTION_paint_selection,
-    .help = STR_ACTION_PAINT_SELECTION_HELP,
+    .help = N_("Fills the selected voxels with the current color"),
     .cfunc = a_paint_selection,
     .flags = ACTION_TOUCH_IMAGE,
 )
@@ -1640,7 +1640,7 @@ static void a_add_selection(void)
 }
 
 ACTION_REGISTER(ACTION_add_selection,
-    .help = STR_ACTION_ADD_SELECTION_HELP,
+    .help = N_("Adds selected area to the mask"),
     .cfunc = a_add_selection,
 )
 
@@ -1660,7 +1660,7 @@ static void a_sub_selection(void)
 }
 
 ACTION_REGISTER(ACTION_sub_selection,
-    .help = STR_ACTION_SUB_SELECTION_HELP,
+    .help = N_("Subtracts selected area from the mask"),
     .cfunc = a_sub_selection,
 )
 
@@ -1783,7 +1783,7 @@ ACTION_REGISTER(ACTION_view_front,
 )
 
 ACTION_REGISTER(ACTION_view_toggle_ortho,
-    .help = STR_ACTION_VIEW_TOGGLE_ORTHO_HELP,
+    .help = N_("Switches the projection (perspective/orthographic)"),
     .flags = ACTION_CAN_EDIT_SHORTCUT,
     .cfunc = a_view_toggle_ortho,
     .default_shortcut = "5",
@@ -1841,7 +1841,7 @@ static void a_reset(void)
 }
 
 ACTION_REGISTER(ACTION_reset,
-    .help = STR_ACTION_RESET_HELP,
+    .help = N_("Creates a new image (discards the current one)"),
     .flags = ACTION_CAN_EDIT_SHORTCUT,
     .cfunc = a_reset,
     .default_shortcut = "Ctrl N"
@@ -1879,7 +1879,7 @@ static void toggle_mode(void)
 }
 
 ACTION_REGISTER(ACTION_toggle_mode,
-    .help = STR_ACTION_TOGGLE_MODE_HELP,
+    .help = N_("Switches the mode (add/subtract/paint)"),
     .flags = ACTION_CAN_EDIT_SHORTCUT,
     .cfunc = toggle_mode,
 )
@@ -1891,7 +1891,7 @@ static void a_set_mode(void *data)
 }
 
 ACTION_REGISTER(ACTION_set_mode_add,
-    .help = STR_ACTION_SET_MODE_ADD_HELP,
+    .help = N_("Adds to the voxels"),
     .flags = ACTION_CAN_EDIT_SHORTCUT,
     .cfunc_data = a_set_mode,
     .data = (int[]){MODE_OVER},
@@ -1900,7 +1900,7 @@ ACTION_REGISTER(ACTION_set_mode_add,
 )
 
 ACTION_REGISTER(ACTION_set_mode_sub,
-    .help = STR_ACTION_SET_MODE_SUB_HELP,
+    .help = N_("Subtract to the voxels"),
     .flags = ACTION_CAN_EDIT_SHORTCUT,
     .cfunc_data = a_set_mode,
     .data = (int[]){MODE_SUB},
@@ -1909,7 +1909,7 @@ ACTION_REGISTER(ACTION_set_mode_sub,
 )
 
 ACTION_REGISTER(ACTION_set_mode_paint,
-    .help = STR_ACTION_SET_MODE_PAINT_HELP,
+    .help = N_("Paints the voxels"),
     .flags = ACTION_CAN_EDIT_SHORTCUT,
     .cfunc_data = a_set_mode,
     .data = (int[]){MODE_PAINT},

src/gui.cpp

@@ -1076,12 +1076,12 @@ bool gui_bbox(float box[4][4])
     y = round(box[3][1] - box[1][1]);
     z = round(box[3][2] - box[2][2]);
 
-    gui_group_begin(_(ORIGIN));
+    gui_group_begin(_("Origin"));
     ret |= gui_input_int("x", &x, 0, 0);
     ret |= gui_input_int("y", &y, 0, 0);
     ret |= gui_input_int("z", &z, 0, 0);
     gui_group_end();
-    gui_group_begin(_(SIZE));
+    gui_group_begin(_("Size"));
     ret |= gui_input_int("w", &w, 0, 0);
     ret |= gui_input_int("h", &h, 0, 0);
     ret |= gui_input_int("d", &d, 0, 0);

src/gui/app.c

@@ -76,32 +76,31 @@ enum {
 };
 
 static struct {
-    int name;
+    const char *name;
     int icon;
     void (*fn)(void);
     bool detached;
 } PANELS[] = {
-    [PANEL_TOOLS]       = {STR_TOOLS, ICON_TOOLS, gui_tools_panel},
-    [PANEL_PALETTE]     = {STR_PALETTE, ICON_PALETTE, gui_palette_panel},
-    [PANEL_EDIT]        = {STR_EDIT, ICON_HAMMER, gui_edit_panel},
-    [PANEL_LAYERS]      = {STR_LAYERS, ICON_LAYERS, gui_layers_panel},
-    [PANEL_SNAP]        = {STR_SNAP, ICON_SNAP, gui_snap_panel},
-    [PANEL_SYMMETRY]    = {STR_SYMMETRY, ICON_SYMMETRY, gui_symmetry_panel},
-    [PANEL_VIEW]        = {STR_VIEW, ICON_VIEW, gui_view_panel},
-    [PANEL_MATERIAL]    = {STR_MATERIALS, ICON_MATERIAL, gui_material_panel},
-    [PANEL_LIGHT]       = {STR_LIGHT, ICON_LIGHT, gui_light_panel},
-    [PANEL_CAMERAS]     = {STR_CAMERAS, ICON_CAMERA, gui_cameras_panel},
-    [PANEL_IMAGE]       = {STR_IMAGE, ICON_IMAGE, gui_image_panel},
+    [PANEL_TOOLS]       = {N_("Tools"), ICON_TOOLS, gui_tools_panel},
+    [PANEL_PALETTE]     = {N_("Palette"), ICON_PALETTE, gui_palette_panel},
+    [PANEL_EDIT]        = {N_("Edit"), ICON_HAMMER, gui_edit_panel},
+    [PANEL_LAYERS]      = {N_("Layers"), ICON_LAYERS, gui_layers_panel},
+    [PANEL_SNAP]        = {N_("Snap"), ICON_SNAP, gui_snap_panel},
+    [PANEL_SYMMETRY]    = {N_("Symmetry"), ICON_SYMMETRY, gui_symmetry_panel},
+    [PANEL_VIEW]        = {N_("View"), ICON_VIEW, gui_view_panel},
+    [PANEL_MATERIAL]    = {N_("Materials"), ICON_MATERIAL, gui_material_panel},
+    [PANEL_LIGHT]       = {N_("Light"), ICON_LIGHT, gui_light_panel},
+    [PANEL_CAMERAS]     = {N_("Cameras"), ICON_CAMERA, gui_cameras_panel},
+    [PANEL_IMAGE]       = {N_("Image"), ICON_IMAGE, gui_image_panel},
 #if YOCTO
-    [PANEL_RENDER]      = {STR_RENDER, ICON_RENDER, gui_render_panel},
+    [PANEL_RENDER]      = {N_("Render"), ICON_RENDER, gui_render_panel},
 #endif
-    [PANEL_EXPORT]      = {STR_EXPORT, ICON_EXPORT, gui_export_panel},
+    [PANEL_EXPORT]      = {N_("Export"), ICON_EXPORT, gui_export_panel},
 #if DEBUG
-    [PANEL_DEBUG]       = {STR_DEBUG, ICON_DEBUG, gui_debug_panel},
+    [PANEL_DEBUG]       = {N_("Debug"), ICON_DEBUG, gui_debug_panel},
 #endif
 };
 
-
 static void on_click(void) {
     if (DEFINED(GUI_SOUND))
         sound_play("click", 1.0, 1.0);

src/gui/cameras_panel.c

@@ -49,18 +49,18 @@ void gui_cameras_panel(void)
     cam = goxel.image->active_camera;
 
     if (gui_section_begin(cam->name, GUI_SECTION_COLLAPSABLE)) {
-        gui_input_float(_(DISTANCE), &cam->dist, 10.0, 0, 0, NULL);
-        gui_checkbox(_(ORTHOGRAPHIC), &cam->ortho, NULL);
+        gui_input_float(_("Distance"), &cam->dist, 10.0, 0, 0, NULL);
+        gui_checkbox(_("Orthographic"), &cam->ortho, NULL);
         gui_group_begin(NULL);
         gui_row_begin(2);
-        gui_action_button(ACTION_view_left, _(LEFT), 1.0);
-        gui_action_button(ACTION_view_right, _(RIGHT), 1.0);
+        gui_action_button(ACTION_view_left, _("Left"), 1.0);
+        gui_action_button(ACTION_view_right, _("Right"), 1.0);
         gui_row_end();
         gui_row_begin(2);
-        gui_action_button(ACTION_view_front, _(FRONT), 1.0);
-        gui_action_button(ACTION_view_top, _(TOP), 1.0);
+        gui_action_button(ACTION_view_front, _("Front"), 1.0);
+        gui_action_button(ACTION_view_top, _("Top"), 1.0);
         gui_row_end();
-        gui_action_button(ACTION_view_default, _(RESET), 1.0);
+        gui_action_button(ACTION_view_default, _("Reset"), 1.0);
         gui_group_end();
 
         // Allow to edit euler angles (Should this be a generic widget?)
@@ -75,7 +75,7 @@ void gui_cameras_panel(void)
         pitch = round(eul[0] * DR2D);
         if (pitch < 0) pitch += 360;
         v = pitch;
-        snprintf(buf, sizeof(buf), "%s: X", _(ANGLE));
+        snprintf(buf, sizeof(buf), "%s: X", _("Angle"));
         if (gui_input_float(buf, &v, 1, -90, 90, "%.0f")) {
             v = (v - pitch) * DD2R;
             camera_turntable(cam, 0, v);

src/gui/edit_panel.c

@@ -24,24 +24,24 @@ void gui_edit_panel(void)
 
     gui_group_begin(NULL);
     gui_enabled_begin(!box_is_null(img->selection_box));
-    gui_action_button(ACTION_fill_selection_box, _(FILL), 1.0);
+    gui_action_button(ACTION_fill_selection_box, _("Fill"), 1.0);
     gui_group_end();
     gui_enabled_end();
 
     gui_group_begin(NULL);
     gui_enabled_begin(!volume_is_empty(goxel.image->selection_mask));
-    gui_action_button(ACTION_layer_clear, _(CLEAR), 1.0);
-    gui_action_button(ACTION_paint_selection, _(PAINT), 1.0);
-    gui_action_button(ACTION_cut_as_new_layer, "Cut as new layer", 1.0);
+    gui_action_button(ACTION_layer_clear, _("Clear"), 1.0);
+    gui_action_button(ACTION_paint_selection, _("Paint"), 1.0);
+    gui_action_button(ACTION_cut_as_new_layer, _("Cut as new layer"), 1.0);
     gui_enabled_end();
     gui_group_end();
 
     gui_group_begin(NULL);
     gui_enabled_begin(!volume_is_empty(goxel.image->selection_mask));
-    gui_action_button(ACTION_copy, _(COPY), 1.0);
+    gui_action_button(ACTION_copy, _("Copy"), 1.0);
     gui_enabled_end();
     gui_enabled_begin(!volume_is_empty(goxel.clipboard.volume));
-    gui_action_button(ACTION_paste, _(PASTE), 1.0);
+    gui_action_button(ACTION_paste, _("Paste"), 1.0);
     gui_enabled_end();
     gui_group_end();
 }

src/gui/export_panel.c

@@ -59,7 +59,7 @@ static void on_format(void *user, file_format_t *f)
 void gui_export_panel(void)
 {
     char label[128];
-    gui_text(_(FORMAT));
+    gui_text(_("Format"));
     if (!g_current) g_current = file_formats; // First one.
 
     make_label(g_current, label, sizeof(label));
@@ -70,7 +70,7 @@ void gui_export_panel(void)
 
     if (g_current->export_gui)
         g_current->export_gui(g_current);
-    if (gui_button(_(EXPORT), 1, 0))
+    if (gui_button(_("Export"), 1, 0))
         goxel_export_to_file(NULL, g_current->name);
 }
 

src/gui/image_panel.c

@@ -23,6 +23,6 @@ void gui_image_panel(void)
     image_t *image = goxel.image;
     float (*box)[4][4] = &image->box;
     gui_bbox(*box);
-    gui_action_button(ACTION_img_auto_resize, _(FIT_TO_CONTENT), -1);
+    gui_action_button(ACTION_img_auto_resize, _("Fit to Content"), -1);
 }
 

src/gui/layers_panel.c

@@ -55,28 +55,28 @@ static void layers_context_menu(void)
     bool bounded;
     char buf[256];
 
-    gui_action_button(ACTION_img_duplicate_layer, _(DUPLICATE), 1);
-    gui_action_button(ACTION_img_clone_layer, _(CLONE), 1);
-    gui_action_button(ACTION_img_merge_layer_down, _(MERGE_DOWN), 1);
-    gui_action_button(ACTION_img_merge_visible_layers, _(MERGE_VISIBLE), 1);
+    gui_action_button(ACTION_img_duplicate_layer, _("Duplicate"), 1);
+    gui_action_button(ACTION_img_clone_layer, _("Clone"), 1);
+    gui_action_button(ACTION_img_merge_layer_down, _("Merge Down"), 1);
+    gui_action_button(ACTION_img_merge_visible_layers, _("Merge Visible"), 1);
 
     layer = goxel.image->active_layer;
     bounded = !box_is_null(layer->box);
 
-    if (bounded && gui_button(_(CROP), 1, 0)) {
+    if (bounded && gui_button(_("Crop"), 1, 0)) {
         volume_crop(layer->volume, layer->box);
     }
     if (!box_is_null(goxel.image->box)) {
-        snprintf(buf, sizeof(buf), "%s: %s", _(CROP), _(IMAGE));
+        snprintf(buf, sizeof(buf), "%s: %s", _("Crop"), _("Image"));
         if (gui_button(buf, 1, 0))
             volume_crop(layer->volume, goxel.image->box);
     }
     if (layer->shape) {
-        snprintf(buf, sizeof(buf), "▶ %s", _(VOLUME));
+        snprintf(buf, sizeof(buf), "▶ %s", _("Volume"));
         gui_action_button(ACTION_img_unclone_layer, buf, 1);
     }
 
-    snprintf(buf, sizeof(buf), "%s: %s", _(ADD), _(SHAPE));
+    snprintf(buf, sizeof(buf), "%s: %s", _("Add"), _("Shape"));
     if (gui_action_button(ACTION_img_new_shape_layer, buf, 1)) {
         action_exec2(ACTION_tool_set_move);
     }
@@ -135,15 +135,15 @@ void gui_layers_panel(void)
 
     if (layer->base_id) {
         gui_group_begin(NULL);
-        gui_action_button(ACTION_img_unclone_layer, _(UNLINK), 1);
+        gui_action_button(ACTION_img_unclone_layer, _("Unlink"), 1);
         gui_action_button(ACTION_img_select_parent_layer, "Select parent", 1);
         gui_group_end();
     }
     if (layer->image) {
-        snprintf(buf, sizeof(buf), "-> %s", _(VOLUME));
+        snprintf(buf, sizeof(buf), "-> %s", _("Volume"));
         gui_action_button(ACTION_img_image_layer_to_volume, buf, 1);
     }
-    if (!layer->shape && gui_checkbox(_(BOUNDED), &bounded, NULL)) {
+    if (!layer->shape && gui_checkbox(_("Bounded"), &bounded, NULL)) {
         if (bounded) {
             volume_get_bbox(layer->volume, bbox, true);
             if (bbox[0][0] > bbox[1][0]) memset(bbox, 0, sizeof(bbox));
@@ -160,7 +160,7 @@ void gui_layers_panel(void)
         gui_color("##color", layer->color);
     }
 
-    gui_text(_(MATERIAL));
+    gui_text(_("Material"));
     if (gui_combo_begin("##material",
                         layer->material ? layer->material->name : NULL)) {
         DL_FOREACH(goxel.image->materials, material) {