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querymodules.c

/* Pango
 * querymodules.c:
 *
 * Copyright (C) 1999 Red Hat Software
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.      See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include <stdlib.h>
//#include <config.h>

#include <glib.h>
#include <gmodule.h>
#include <pango/pango-break.h>
#include <pango/pango-context.h>
//#include <pango/pango-impl-utils.h>
#include <pango/pango-utils.h>
#include <pango/pango-engine.h>
#include <pango/pango-enum-types.h>

#include <errno.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <glib/gprintf.h>

#ifdef USE_LA_MODULES
#define SOEXT ".la"
#else
#define SOEXT ("." G_MODULE_SUFFIX)
#endif
#define SOEXT_LEN ((int) strlen (SOEXT))

static gboolean
string_needs_escape (const char *str)
{
  while (TRUE)
    {
      char c = *str++;

      if (!c)
      return FALSE;
      else if (c == '\"' || c == '\\' || g_ascii_isspace (c))
      return TRUE;
    }
}

static char *
escape_string (const char *str)
{
  GString *result = g_string_new (NULL);

  while (TRUE)
    {
      char c = *str++;
      
      switch (c)
      {
      case '\0':
        goto done;
      case '\n':
        g_string_append (result, "\\n");
        break;
      case '\"':
        g_string_append (result, "\\\"");
        break;
      case '\\':
        g_string_append (result, "\\\\");
        break;
      default:
        g_string_append_c (result, c);
      }
    }

 done:
  return g_string_free (result, FALSE);
}

#define GET_SYMBOL(module,name,location)                 \
  g_module_symbol (module, name, (gpointer *)(void *)&location)

static const char *
string_from_script (PangoScript script)
{
  static GEnumClass *class = NULL;
  GEnumValue *value;
  if (!class)
    class = g_type_class_ref (PANGO_TYPE_SCRIPT);
  
  value = g_enum_get_value (class, script);
  if (!value)
    {
      g_warning ("Engine reported invalid script value %d\n", script);
      return string_from_script (PANGO_SCRIPT_INVALID_CODE);
    }

  return value->value_nick;
}

static void 
query_module (const char *dir, const char *name)
{
  void (*list) (PangoEngineInfo **engines, gint *n_engines);
  void (*init) (GTypeModule *module);
  void (*exit) (void);
  PangoEngine *(*create) (const gchar *id);

  GModule *module;
  gchar *path;

  if (g_path_is_absolute (name))
    path = g_strdup (name);
  else
    path = g_build_filename (dir, name, NULL);
  
  module = g_module_open (path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);

  if (!module)
    g_printerr ("Cannot load module %s: %s\n", path, g_module_error ());
        
  if (module &&
      GET_SYMBOL (module, "script_engine_list", list) &&
      GET_SYMBOL (module, "script_engine_init", init) &&
      GET_SYMBOL (module, "script_engine_exit", exit) &&
      GET_SYMBOL (module, "script_engine_create", create))
    {
      gint i,j;
      PangoEngineInfo *engines;
      gint n_engines;

      (*list) (&engines, &n_engines);

      for (i=0; i<n_engines; i++)
      {
        const gchar *quote;
        gchar *quoted_path;

        if (string_needs_escape (path))
          {
            quote = "\"";
            quoted_path = escape_string (path);
          }
        else
          {
            quote = "";
            quoted_path = g_strdup (path);
          }
        
        g_printf ("%s%s%s %s %s %s", quote, quoted_path, quote,
                engines[i].id, engines[i].engine_type, engines[i].render_type);
        g_free (quoted_path);

        for (j=0; j < engines[i].n_scripts; j++)
          {
            g_printf (" %s:%s",
                  string_from_script (engines[i].scripts[j].script),
                  engines[i].scripts[j].langs);
          }
        g_printf ("\n");
      }
    }
  else
    {
      g_printerr ("%s does not export Pango module API\n", path);
    }
  
  g_free (path);
  if (module)
    g_module_close (module);
}                  

static gboolean
show_version(const char *name,
           const char *arg,
           gpointer    data,
           GError    **error)
{
  g_printf("pango-querymodules (%s) %s\n", PACKAGE_NAME, PACKAGE_VERSION);
  g_printf("module interface version: %s\n", MODULE_VERSION);
  exit(0);
}

int
main (int argc, char **argv)
{
  char *cwd;
  int i;
  char *path;
  GOptionContext *context;
  GError *parse_error = NULL;
  GOptionEntry entries[] =
    {
      {"version", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK, &show_version,
       "Show version numbers",                                             NULL},
      {NULL}
    };
  
  context = g_option_context_new ("- [MODULE]...");
  g_option_context_add_main_entries (context, entries, NULL);
 
  if (!g_option_context_parse (context, &argc, &argv, &parse_error))
    {
      if (parse_error != NULL)
      {
        g_printerr("Parse option error: %s\n", parse_error->message);
      }
      else
      {
        g_printerr("Parse option error\n");
      }
      exit(1);
    }
  
  g_option_context_free(context);
  
  g_type_init ();
  
  g_printf ("# Pango Modules file\n"
          "# Automatically generated file, do not edit\n"
          "#\n");

  if (argc == 1)        /* No arguments given */
    {
      char **dirs;
      int i;
      
      path = pango_config_key_get ("Pango/ModulesPath");
      if (!path)
        {
          path = g_build_filename (pango_get_lib_subdirectory (),
                                   MODULE_VERSION,
                                   "modules",
                                   NULL);
          GDir *dir = g_dir_open (path, 0, NULL);
          char *dpath, *fulldent;
          if (dir)
            {
                                  char *origpath = g_strdup (path);
              const char *dent;

              while ((dent = g_dir_read_name (dir)))
                {
                                                      fulldent = g_strconcat (origpath, G_DIR_SEPARATOR_S, dent, NULL);
                  if (g_file_test (fulldent, G_FILE_TEST_IS_DIR))
                    {
                      dpath = path;
                      path = g_strconcat (dpath, ":", origpath,
                                                                     G_DIR_SEPARATOR_S, dent, NULL);
                      g_free (dpath);
                    }
                                                  g_free (fulldent);
                }
              
              g_dir_close (dir);
                                          g_free (origpath);
            }
        }

      g_printf ("# ModulesPath = %s\n#\n", path);

      dirs = pango_split_file_list (path);

      g_free (path);

      for (i=0; dirs[i]; i++)
      {
        GDir *dir = g_dir_open (dirs[i], 0, NULL);
        if (dir)
          {
            const char *dent;

            while ((dent = g_dir_read_name (dir)))
            {
              int len = strlen (dent);
              if (len > SOEXT_LEN && strcmp (dent + len - SOEXT_LEN, SOEXT) == 0)
                query_module (dirs[i], dent);
            }
            
            g_dir_close (dir);
          }
      }

      g_strfreev (dirs);
    }
  else
    {
      cwd = g_get_current_dir ();
      
      for (i=1; i<argc; i++)
      query_module (cwd, argv[i]);

      g_free (cwd);
    }
  
  return 0;
}

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