[pango/visible-things-2: 9/16] pango-view: Add an option to show ignorables

[Matthias Clasen <matthiasc src gnome org>]

commit 7884f99ecc497c51cb69f7f0afc4dfe25f97d596
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jul 7 13:52:36 2019 -0400

    pango-view: Add an option to show ignorables

 utils/viewer-render.c | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/utils/viewer-render.c b/utils/viewer-render.c
index 5a556cd8..f149384a 100644
--- a/utils/viewer-render.c
+++ b/utils/viewer-render.c
@@ -53,6 +53,7 @@ int opt_height = -1;
 int opt_indent = 0;
 int opt_spacing = 0;
 double opt_line_spacing = 0.0;
+gboolean opt_show_ignorables = FALSE;
 gboolean opt_justify = 0;
 int opt_runs = 1;
 PangoAlignment opt_align = PANGO_ALIGN_LEFT;
@@ -96,6 +97,7 @@ make_layout(PangoContext *context,
   static PangoFontDescription *font_description;
   PangoAlignment align;
   PangoLayout *layout;
+  PangoShapeFlags flags;
 
   layout = pango_layout_new (context);
   if (opt_markup)
@@ -130,6 +132,11 @@ make_layout(PangoContext *context,
   if (opt_line_spacing != 0.0)
     pango_layout_set_line_spacing (layout, (float)opt_line_spacing);
 
+  flags = PANGO_SHAPE_NONE;
+  if (opt_show_ignorables)
+    flags |= PANGO_SHAPE_SHOW_IGNORABLES;
+  pango_layout_set_shape_flags (layout, flags);
+
   align = opt_align;
   if (align != PANGO_ALIGN_CENTER &&
       pango_context_get_base_dir (context) != PANGO_DIRECTION_LTR) {
@@ -716,6 +723,8 @@ parse_options (int argc, char *argv[])
      "Spacing in points between lines",                                    "points"},
     {"line-spacing",   0, 0, G_OPTION_ARG_DOUBLE,                      &opt_line_spacing,
      "Spread factor for line height",                              "factor"},
+    {"show-ignorables",        0, 0, G_OPTION_ARG_NONE,                        &opt_show_ignorables,
+     "Show invisible characters",                                  NULL},
     {"justify",                0, 0, G_OPTION_ARG_NONE,                        &opt_justify,
      "Align paragraph lines to be justified",                          NULL},
     {"language",       0, 0, G_OPTION_ARG_STRING,                      &opt_language,