commit 321f73c16efa0730c96e001d65268f4927a0f735
author Behdad Esfahbod <behdad@behdad.org> Tue Nov 13 15:12:24 2012 -0800
committer Behdad Esfahbod <behdad@behdad.org> Tue Nov 13 15:12:24 2012 -0800
tree 8af88c9663047c4ef653eacab4ebd3db3a3353c3
parent e13f8d280bafc6a6b6e31e2eee587660b8333c56

[util] Add --text-before and --text-after to hb-shape / hb-view

Use with Arabic, for example, to see the effect on joining.

util/options.hh

diff --git a/util/options.hh b/util/options.hh
index 5d25d9e..0f6fce2 100644
--- a/util/options.hh
+++ b/util/options.hh
@@ -167,10 +167,18 @@
     hb_buffer_set_language (buffer, hb_language_from_string (language, -1));
   }
 
-  void populate_buffer (hb_buffer_t *buffer, const char *text, int text_len)
+  void populate_buffer (hb_buffer_t *buffer, const char *text, int text_len,
+			const char *text_before, const char *text_after)
   {
-    hb_buffer_reset (buffer);
+    hb_buffer_clear (buffer);
+    if (text_before) {
+      unsigned int len = strlen (text_before);
+      hb_buffer_add_utf8 (buffer, text_before, len, len, 0);
+    }
     hb_buffer_add_utf8 (buffer, text, text_len, 0, text_len);
+    if (text_after) {
+      hb_buffer_add_utf8 (buffer, text_after, -1, 0, 0);
+    }
 
     if (!utf8_clusters) {
       /* Reset cluster values to refer to Unicode character index
@@ -245,6 +253,9 @@
 struct text_options_t : option_group_t
 {
   text_options_t (option_parser_t *parser) {
+    text_before = NULL;
+    text_after = NULL;
+
     text = NULL;
     text_file = NULL;
 
@@ -273,6 +284,9 @@
 
   const char *get_line (unsigned int *len);
 
+  const char *text_before;
+  const char *text_after;
+
   const char *text;
   const char *text_file;