From 62798ca7e5a73d04e138baef11fff410dc7eb7d4 Mon Sep 17 00:00:00 2001
From: Akira TAGOH <akira@tagoh.org>
Date: Thu, 24 May 2012 13:50:48 +0900
Subject: Add an API to create charset from string

Also add --string option to fc-match to compute the best font from
the given string
---
 fc-match/fc-match.c     | 24 +++++++++++++++++++-----
 fontconfig/fontconfig.h |  4 ++++
 src/fccharset.c         | 36 ++++++++++++++++++++++++++++++++++++
 3 files changed, 59 insertions(+), 5 deletions(-)

diff --git a/fc-match/fc-match.c b/fc-match/fc-match.c
index dee61479..ee95f7d8 100644
--- a/fc-match/fc-match.c
+++ b/fc-match/fc-match.c
@@ -63,6 +63,7 @@ static const struct option longopts[] = {
     {"verbose", 0, 0, 'v'},
     {"brief", 0, 0, 'b'},
     {"format", 1, 0, 'f'},
+    {"string", 1, 0, 'r'},
     {"version", 0, 0, 'V'},
     {"help", 0, 0, 'h'},
     {NULL,0,0,0},
@@ -79,10 +80,10 @@ usage (char *program, int error)
 {
     FILE *file = error ? stderr : stdout;
 #if HAVE_GETOPT_LONG
-    fprintf (file, _("usage: %s [-savbVh] [-f FORMAT] [--sort] [--all] [--verbose] [--brief] [--format=FORMAT] [--version] [--help] [pattern] {element...}\n"),
+    fprintf (file, _("usage: %s [-savbVh] [-f FORMAT] [-r STRING] [--sort] [--all] [--verbose] [--brief] [--format=FORMAT] [--string=STRING] [--version] [--help] [pattern] {element...}\n"),
 	     program);
 #else
-    fprintf (file, _("usage: %s [-savVh] [-f FORMAT] [pattern] {element...}\n"),
+    fprintf (file, _("usage: %s [-savVh] [-f FORMAT] [-r STRING] [pattern] {element...}\n"),
 	     program);
 #endif
     fprintf (file, _("List best font matching [pattern]\n"));
@@ -93,6 +94,7 @@ usage (char *program, int error)
     fprintf (file, _("  -v, --verbose        display entire font pattern verbosely\n"));
     fprintf (file, _("  -b, --brief          display entire font pattern briefly\n"));
     fprintf (file, _("  -f, --format=FORMAT  use the given output format\n"));
+    fprintf (file, _("  -r, --string=STRING  compute the best font for STRING\n"));
     fprintf (file, _("  -V, --version        display font config version and exit\n"));
     fprintf (file, _("  -h, --help           display this help and exit\n"));
 #else
@@ -101,6 +103,7 @@ usage (char *program, int error)
     fprintf (file, _("  -v         (verbose) display entire font pattern verbosely\n"));
     fprintf (file, _("  -b         (brief)   display entire font pattern briefly\n"));
     fprintf (file, _("  -f FORMAT  (format)  use the given output format\n"));
+    fprintf (file, _("  -r STRING  (string)  compute the best font for STRING\n"));
     fprintf (file, _("  -V         (version) display font config version and exit\n"));
     fprintf (file, _("  -h         (help)    display this help and exit\n"));
 #endif
@@ -113,20 +116,21 @@ main (int argc, char **argv)
     int			verbose = 0;
     int			brief = 0;
     int			sort = 0, all = 0;
-    const FcChar8	*format = NULL;
+    const FcChar8	*format = NULL, *string = NULL;
     int			i;
     FcObjectSet		*os = 0;
     FcFontSet		*fs;
     FcPattern		*pat;
     FcResult		result;
+    FcCharSet		*fcs;
 #if HAVE_GETOPT_LONG || HAVE_GETOPT
     int			c;
 
     setlocale (LC_ALL, "");
 #if HAVE_GETOPT_LONG
-    while ((c = getopt_long (argc, argv, "asvbf:Vh", longopts, NULL)) != -1)
+    while ((c = getopt_long (argc, argv, "asvbf:r:Vh", longopts, NULL)) != -1)
 #else
-    while ((c = getopt (argc, argv, "asvbf:Vh")) != -1)
+    while ((c = getopt (argc, argv, "asvbf:r:Vh")) != -1)
 #endif
     {
 	switch (c) {
@@ -145,6 +149,9 @@ main (int argc, char **argv)
 	case 'f':
 	    format = (FcChar8 *) strdup (optarg);
 	    break;
+	case 'r':
+	    string = (FcChar8 *) strdup (optarg);
+	    break;
 	case 'V':
 	    fprintf (stderr, "fontconfig version %d.%d.%d\n", 
 		     FC_MAJOR, FC_MINOR, FC_REVISION);
@@ -181,6 +188,13 @@ main (int argc, char **argv)
     if (!pat)
 	return 1;
 
+    if (string)
+    {
+	fcs = FcCharSetCreateFromString (string, -1);
+	if (fcs)
+	    FcPatternAddCharSet (pat, FC_CHARSET, fcs);
+    }
+
     FcConfigSubstitute (0, pat, FcMatchPattern);
     FcDefaultSubstitute (pat);
     
diff --git a/fontconfig/fontconfig.h b/fontconfig/fontconfig.h
index 5c04219e..0cf95026 100644
--- a/fontconfig/fontconfig.h
+++ b/fontconfig/fontconfig.h
@@ -547,6 +547,10 @@ FcCharSetNextPage (const FcCharSet  *a,
 		   FcChar32	    map[FC_CHARSET_MAP_SIZE],
 		   FcChar32	    *next);
 
+FcCharSet *
+FcCharSetCreateFromString (const FcChar8 *strings,
+			   ssize_t        len);
+
 /*
  * old coverage API, rather hard to use correctly
  */
diff --git a/src/fccharset.c b/src/fccharset.c
index 114f9484..370e4e1b 100644
--- a/src/fccharset.c
+++ b/src/fccharset.c
@@ -1395,6 +1395,42 @@ FcCharSetSerialize(FcSerialize *serialize, const FcCharSet *cs)
 
     return cs_serialized;
 }
+
+FcCharSet *
+FcCharSetCreateFromString (const FcChar8 *strings,
+			   ssize_t        len)
+{
+    ssize_t i;
+    FcChar32 c;
+    int clen;
+    FcCharSet *fcs;
+
+    if (!strings || strings[0] == '\0' || len == 0)
+	return NULL;
+
+    if (len < 0)
+	len = strlen ((const char *)strings);
+
+    fcs = FcCharSetCreate ();
+    i = 0;
+    while (i < len)
+    {
+	clen = FcUtf8ToUcs4 (&strings[i], &c, len - i);
+	if (clen <= 0) /* malformed UTF-8 string */
+	    goto bail;
+	i += clen;
+	if (!FcCharSetAddChar (fcs, c))
+	    goto bail;
+    }
+
+    return fcs;
+  bail:
+    if (fcs)
+	FcCharSetDestroy (fcs);
+
+    return NULL;
+}
+
 #define __fccharset__
 #include "fcaliastail.h"
 #undef __fccharset__
-- 
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