Rename pango-view/ dir to utils/

1 files changed, 823 insertions, 0 deletions

diff --git a/utils/viewer-render.c b/utils/viewer-render.c
new file mode 100644
index 00000000..573cb59a
--- /dev/null
+++ b/utils/viewer-render.c
@@ -0,0 +1,823 @@
+/* viewer-render.c: Common code for rendering in viewers
+ *
+ * Copyright (C) 1999, 2004 Red Hat Software
+ * Copyright (C) 2001 Sun Microsystems
+ *
+ * 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 "config.h"
+#include <errno.h>
+#include <math.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <glib.h>
+#include <glib/gprintf.h>
+#include <pango/pango.h>
+
+#include "viewer-render.h"
+
+gboolean opt_display = TRUE;
+int opt_dpi = 96;
+gboolean opt_pixels = FALSE;
+const char *opt_font = "";
+gboolean opt_header = FALSE;
+const char *opt_output = NULL;
+int opt_margin_t = 10;
+int opt_margin_r = 10;
+int opt_margin_b = 10;
+int opt_margin_l = 10;
+int opt_markup = FALSE;
+gboolean opt_rtl = FALSE;
+double opt_rotate = 0;
+gboolean opt_auto_dir = TRUE;
+const char *opt_text = NULL;
+gboolean opt_waterfall = FALSE;
+int opt_width = -1;
+int opt_height = -1;
+int opt_indent = 0;
+gboolean opt_justify = 0;
+int opt_runs = 1;
+PangoAlignment opt_align = PANGO_ALIGN_LEFT;
+PangoEllipsizeMode opt_ellipsize = PANGO_ELLIPSIZE_NONE;
+PangoGravity opt_gravity = PANGO_GRAVITY_SOUTH;
+PangoGravityHint opt_gravity_hint = PANGO_GRAVITY_HINT_NATURAL;
+HintMode opt_hinting = HINT_DEFAULT;
+PangoWrapMode opt_wrap = PANGO_WRAP_WORD_CHAR;
+gboolean opt_wrap_set = FALSE;
+static const char *opt_pangorc = NULL; /* Unused */
+const PangoViewer *opt_viewer = NULL;
+const char *opt_language = NULL;
+gboolean opt_single_par = FALSE;
+PangoColor opt_fg_color = {0, 0, 0};
+guint16 opt_fg_alpha = 65535;
+gboolean opt_bg_set = FALSE;
+PangoColor opt_bg_color = {65535, 65535, 65535};
+guint16 opt_bg_alpha = 65535;
+
+/* Text (or markup) to render */
+static char *text;
+
+void
+fail (const char *format, ...)
+{
+  const char *msg;
+
+  va_list vap;
+  va_start (vap, format);
+  msg = g_strdup_vprintf (format, vap);
+  g_printerr ("%s: %s\n", g_get_prgname (), msg);
+
+  exit (1);
+}
+
+static PangoLayout *
+make_layout(PangoContext *context,
+	    const char   *text,
+	    double        size)
+{
+  static PangoFontDescription *font_description;
+  PangoAlignment align;
+  PangoLayout *layout;
+
+  layout = pango_layout_new (context);
+  if (opt_markup)
+    pango_layout_set_markup (layout, text, -1);
+  else
+    pango_layout_set_text (layout, text, -1);
+
+  pango_layout_set_auto_dir (layout, opt_auto_dir);
+  pango_layout_set_ellipsize (layout, opt_ellipsize);
+  pango_layout_set_justify (layout, opt_justify);
+  pango_layout_set_single_paragraph_mode (layout, opt_single_par);
+  pango_layout_set_wrap (layout, opt_wrap);
+
+  font_description = pango_font_description_from_string (opt_font);
+  if (size > 0)
+    pango_font_description_set_size (font_description, size * PANGO_SCALE);
+
+  if (opt_width > 0)
+    pango_layout_set_width (layout, (opt_width * opt_dpi * PANGO_SCALE + 36) / 72);
+
+  if (opt_height > 0)
+    pango_layout_set_height (layout, (opt_height * opt_dpi * PANGO_SCALE + 36) / 72);
+  else
+    pango_layout_set_height (layout, opt_height);
+
+  if (opt_indent != 0)
+    pango_layout_set_indent (layout, (opt_indent * opt_dpi * PANGO_SCALE + 36) / 72);
+
+  align = opt_align;
+  if (align != PANGO_ALIGN_CENTER &&
+      pango_context_get_base_dir (context) != PANGO_DIRECTION_LTR) {
+    /* pango reverses left and right if base dir ir rtl.  so we should
+     * reverse to cancel that.  unfortunately it also does that for
+     * rtl paragraphs, so we cannot really get left/right.  all we get
+     * is default/other-side. */
+    align = PANGO_ALIGN_LEFT + PANGO_ALIGN_RIGHT - align;
+  }
+  pango_layout_set_alignment (layout, align);
+
+  pango_layout_set_font_description (layout, font_description);
+
+  pango_font_description_free (font_description);
+
+  return layout;
+}
+
+gchar *
+get_options_string (void)
+{
+  PangoFontDescription *font_description = pango_font_description_from_string (opt_font);
+  gchar *font_name;
+  gchar *result;
+
+  if (opt_waterfall)
+    pango_font_description_unset_fields (font_description, PANGO_FONT_MASK_SIZE);
+
+  font_name = pango_font_description_to_string (font_description);
+  result = g_strdup_printf ("%s: %s (%d dpi)", opt_viewer->name, font_name, opt_dpi);
+  pango_font_description_free (font_description);
+  g_free (font_name);
+
+  return result;
+}
+
+static void
+output_body (PangoLayout    *layout,
+	     RenderCallback  render_cb,
+	     gpointer        cb_context,
+	     gpointer        cb_data,
+	     int            *width,
+	     int            *height,
+	     gboolean        supports_matrix)
+{
+  PangoRectangle logical_rect;
+  int size, start_size, end_size, increment;
+  int x = 0, y = 0;
+
+  if (!supports_matrix)
+    {
+      const PangoMatrix* matrix;
+      const PangoMatrix identity = PANGO_MATRIX_INIT;
+      PangoContext *context = pango_layout_get_context (layout);
+      matrix = pango_context_get_matrix (context);
+      if (matrix)
+	{
+	  x += matrix->x0;
+	  y += matrix->y0;
+	}
+      pango_context_set_matrix (context, &identity);
+      pango_layout_context_changed (layout);
+    }
+
+  if (opt_waterfall)
+    {
+      start_size = 8;
+      end_size = 48;
+      increment = 4;
+    }
+  else
+    {
+      start_size = end_size = -1;
+      increment = 1;
+    }
+
+  *width = 0;
+  *height = 0;
+
+  for (size = start_size; size <= end_size; size += increment)
+    {
+      if (size > 0)
+        {
+	  PangoFontDescription *desc = pango_font_description_copy (pango_layout_get_font_description (layout));
+	  pango_font_description_set_size (desc, size * PANGO_SCALE);
+	  pango_layout_set_font_description (layout, desc);
+	  pango_font_description_free (desc);
+	}
+
+      pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
+
+      if (render_cb)
+	(*render_cb) (layout, x, y+*height, cb_context, cb_data);
+
+      *width = MAX (*width, 
+		    MAX (logical_rect.x + logical_rect.width,
+			 PANGO_PIXELS (pango_layout_get_width (layout))));
+      *height +=    MAX (logical_rect.y + logical_rect.height,
+			 PANGO_PIXELS (pango_layout_get_height (layout)));
+    }
+}
+
+static void
+set_transform (PangoContext     *context,
+	       TransformCallback transform_cb,
+	       gpointer          cb_context,
+	       gpointer          cb_data,
+	       PangoMatrix      *matrix)
+{
+  pango_context_set_matrix (context, matrix);
+  if (transform_cb)
+    (*transform_cb) (context, matrix, cb_context, cb_data);
+}
+
+void
+do_output (PangoContext     *context,
+	   RenderCallback    render_cb,
+	   TransformCallback transform_cb,
+	   gpointer          cb_context,
+	   gpointer          cb_data,
+	   int              *width_out,
+	   int              *height_out)
+{
+  PangoLayout *layout;
+  PangoRectangle rect;
+  PangoMatrix matrix = PANGO_MATRIX_INIT;
+  PangoMatrix *orig_matrix;
+  gboolean supports_matrix;
+  int rotated_width, rotated_height;
+  int x = opt_margin_l;
+  int y = opt_margin_t;
+  int width, height;
+
+  width = 0;
+  height = 0;
+
+  orig_matrix = pango_matrix_copy (pango_context_get_matrix (context));
+  /* If the backend sets an all-zero matrix on the context,
+   * means that it doesn't support transformations.
+   */
+  supports_matrix = !orig_matrix ||
+		    (orig_matrix->xx != 0. || orig_matrix->xy != 0. ||
+		     orig_matrix->yx != 0. || orig_matrix->yy != 0. ||
+		     orig_matrix->x0 != 0. || orig_matrix->y0 != 0.);
+
+  set_transform (context, transform_cb, cb_context, cb_data, NULL);
+
+  pango_context_set_language (context,
+			      opt_language ? pango_language_from_string (opt_language)
+					   : pango_language_get_default ());
+  pango_context_set_base_dir (context,
+			      opt_rtl ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR);
+
+  if (opt_header)
+    {
+      char *options_string = get_options_string ();
+      pango_context_set_base_gravity (context, PANGO_GRAVITY_SOUTH);
+      layout = make_layout (context, options_string, 10);
+      pango_layout_get_extents (layout, NULL, &rect);
+
+      width = MAX (width, PANGO_PIXELS (rect.width));
+      height += PANGO_PIXELS (rect.height);
+
+      if (render_cb)
+	(*render_cb) (layout, x, y, cb_context, cb_data);
+
+      y += PANGO_PIXELS (rect.height);
+
+      g_object_unref (layout);
+      g_free (options_string);
+    }
+
+  if (opt_rotate != 0)
+    {
+      if (supports_matrix)
+	pango_matrix_rotate (&matrix, opt_rotate);
+      else
+	g_printerr ("The backend does not support rotated text\n");
+    }
+
+  pango_context_set_base_gravity (context, opt_gravity);
+  pango_context_set_gravity_hint (context, opt_gravity_hint);
+
+  layout = make_layout (context, text, -1);
+
+  set_transform (context, transform_cb, cb_context, cb_data, &matrix);
+
+  output_body (layout,
+	       NULL, NULL, NULL,
+	       &rotated_width, &rotated_height,
+	       supports_matrix);
+
+  rect.x = rect.y = 0;
+  rect.width = rotated_width;
+  rect.height = rotated_height;
+
+  pango_matrix_transform_pixel_rectangle (&matrix, &rect);
+
+  matrix.x0 = x - rect.x;
+  matrix.y0 = y - rect.y;
+
+  set_transform (context, transform_cb, cb_context, cb_data, &matrix);
+
+  if (render_cb)
+    output_body (layout,
+		 render_cb, cb_context, cb_data,
+		 &rotated_width, &rotated_height,
+		 supports_matrix);
+
+  width = MAX (width, rect.width);
+  height += rect.height;
+
+  width += opt_margin_l + opt_margin_r;
+  height += opt_margin_t + opt_margin_b;
+
+  if (width_out)
+    *width_out = width;
+  if (height_out)
+    *height_out = height;
+
+  pango_context_set_matrix (context, orig_matrix);
+  pango_matrix_free (orig_matrix);
+  g_object_unref (layout);
+}
+
+static gboolean
+parse_enum (GType       type,
+	    int        *value,
+	    const char *name,
+	    const char *arg,
+	    gpointer    data G_GNUC_UNUSED,
+	    GError **error)
+{
+  char *possible_values = NULL;
+  gboolean ret;
+
+G_GNUC_BEGIN_IGNORE_DEPRECATIONS
+  ret = pango_parse_enum (type,
+			  arg,
+			  value,
+			  FALSE,
+			  &possible_values);
+G_GNUC_END_IGNORE_DEPRECATIONS
+
+  if (!ret && error)
+    {
+      g_set_error(error,
+		  G_OPTION_ERROR,
+		  G_OPTION_ERROR_BAD_VALUE,
+		  "Argument for %s must be one of %s",
+		  name,
+		  possible_values);
+    }
+
+  g_free (possible_values);
+
+  return ret;
+}
+
+static gboolean
+parse_align (const char *name,
+	     const char *arg,
+	     gpointer    data,
+	     GError **error)
+{
+  return parse_enum (PANGO_TYPE_ALIGNMENT, (int*)(void*)&opt_align,
+		     name, arg, data, error);
+}
+
+static gboolean
+parse_ellipsis (const char *name,
+		const char *arg,
+		gpointer    data,
+		GError **error)
+{
+  return parse_enum (PANGO_TYPE_ELLIPSIZE_MODE, (int*)(void*)&opt_ellipsize,
+		     name, arg, data, error);
+}
+
+static gboolean
+parse_gravity (const char *name,
+	       const char *arg,
+	       gpointer    data,
+	       GError **error)
+{
+  return parse_enum (PANGO_TYPE_GRAVITY, (int*)(void*)&opt_gravity,
+		     name, arg, data, error);
+}
+
+static gboolean
+parse_gravity_hint (const char *name,
+		    const char *arg,
+		    gpointer    data,
+		    GError **error)
+{
+  return parse_enum (PANGO_TYPE_GRAVITY_HINT, (int*)(void*)&opt_gravity_hint,
+		     name, arg, data, error);
+}
+
+static gboolean
+parse_hinting (const char *name G_GNUC_UNUSED,
+	       const char *arg,
+	       gpointer    data G_GNUC_UNUSED,
+	       GError    **error)
+{
+  gboolean ret = TRUE;
+
+  if (strcmp (arg, "none") == 0)
+    opt_hinting = HINT_NONE;
+  else if (strcmp (arg, "auto") == 0)
+    opt_hinting = HINT_AUTO;
+  else if (strcmp (arg, "full") == 0)
+    opt_hinting = HINT_FULL;
+  else
+    {
+      g_set_error(error,
+		  G_OPTION_ERROR,
+		  G_OPTION_ERROR_BAD_VALUE,
+		  "Argument for --hinting must be one of none/auto/full");
+      ret = FALSE;
+    }
+
+  return ret;
+}
+
+static gboolean
+parse_wrap (const char *name,
+	    const char *arg,
+	    gpointer    data,
+	    GError    **error)
+{
+  gboolean ret;
+  if ((ret = parse_enum (PANGO_TYPE_WRAP_MODE, (int*)(void*)&opt_wrap,
+			 name, arg, data, error)))
+    {
+      opt_wrap_set = TRUE;
+    }
+  return ret;
+}
+
+static gboolean
+parse_rgba_color (PangoColor *color,
+		  guint16    *alpha,
+		  const char *name,
+		  const char *arg,
+		  gpointer    data G_GNUC_UNUSED,
+		  GError    **error)
+{
+  gboolean ret;
+  char buf[32];
+  int len;
+
+  len = strlen (arg);
+  /* handle alpha */
+  if (*arg == '#' && (len == 5 || len == 9 || len == 17))
+    {
+      int width, bits;
+      unsigned int a;
+
+      bits = len - 1;
+      width = bits >> 2;
+
+      strcpy (buf, arg);
+      arg = buf;
+
+      if (!sscanf (buf + len - width, "%x", &a))
+        {
+	  ret = FALSE;
+	  goto err;
+	}
+      buf[len - width] = '\0';
+
+      a <<= (16 - bits);
+      while (bits < 16)
+        {
+	  a |= (a >> bits);
+	  bits *= 2;
+	}
+      *alpha = a;
+    }
+  else
+    *alpha = 65535;
+
+  ret = pango_color_parse (color, arg);
+
+err:
+  if (!ret && error)
+    {
+      g_set_error(error,
+		  G_OPTION_ERROR,
+		  G_OPTION_ERROR_BAD_VALUE,
+		  "Argument for %s must be a color name like red, or CSS-style #rrggbb / #rrggbbaa",
+		  name);
+    }
+
+  return ret;
+}
+
+static gboolean
+parse_foreground (const char *name,
+		  const char *arg,
+		  gpointer    data,
+		  GError **error)
+{
+  return parse_rgba_color (&opt_fg_color, &opt_fg_alpha,
+			   name, arg, data, error);
+}
+
+static gboolean
+parse_background (const char *name,
+		  const char *arg,
+		  gpointer    data,
+		  GError **error)
+{
+  opt_bg_set = TRUE;
+
+  if (0 == strcmp ("transparent", arg))
+    {
+      opt_bg_alpha = 0;
+      return TRUE;
+    }
+
+  return parse_rgba_color (&opt_bg_color, &opt_bg_alpha,
+			   name, arg, data, error);
+}
+
+static gboolean
+parse_margin (const char *name G_GNUC_UNUSED,
+	      const char *arg,
+	      gpointer    data G_GNUC_UNUSED,
+	      GError    **error)
+{
+  switch (sscanf (arg, "%d%*[ ,]%d%*[ ,]%d%*[ ,]%d", &opt_margin_t, &opt_margin_r, &opt_margin_b, &opt_margin_l))
+  {
+    case 0:
+    {
+      g_set_error(error,
+		  G_OPTION_ERROR,
+		  G_OPTION_ERROR_BAD_VALUE,
+		  "Argument for --margin must be one to four space-separated numbers");
+      return FALSE;
+    }
+    case 1: opt_margin_r = opt_margin_t;
+    case 2: opt_margin_b = opt_margin_t;
+    case 3: opt_margin_l = opt_margin_r;
+  }
+  return TRUE;
+}
+
+
+static gchar *
+backends_to_string (void)
+{
+  GString *backends = g_string_new (NULL);
+  const PangoViewer **viewer;
+
+  for (viewer = viewers; *viewer; viewer++)
+    if ((*viewer)->id)
+      {
+	g_string_append (backends, (*viewer)->id);
+	g_string_append_c (backends, '/');
+      }
+  g_string_truncate (backends, MAX (0, (gint)backends->len - 1));
+
+  return g_string_free(backends,FALSE);
+}
+
+static int
+backends_get_count (void)
+{
+  const PangoViewer **viewer;
+  int i = 0;
+
+  for (viewer = viewers; *viewer; viewer++)
+    if ((*viewer)->id)
+      i++;
+
+  return i;
+}
+
+
+static gchar *
+backend_description (void)
+{
+ GString *description  = g_string_new("Pango backend to use for rendering ");
+ int backends_count = backends_get_count ();
+
+ if (backends_count > 1)
+   g_string_append_printf(description,"(default: %s)", (*viewers)->id);
+ else if (backends_count == 1)
+   g_string_append_printf(description,"(only available: %s)", (*viewers)->id);
+ else
+   g_string_append_printf(description,"(no backends found!)");
+
+ return g_string_free(description,FALSE);
+
+}
+
+static gboolean
+parse_backend (const char *name G_GNUC_UNUSED,
+	       const char *arg,
+	       gpointer    data G_GNUC_UNUSED,
+	       GError    **error)
+{
+  gboolean ret = TRUE;
+  const PangoViewer **viewer;
+
+  for (viewer = viewers; *viewer; viewer++)
+    if (!g_ascii_strcasecmp ((*viewer)->id, arg))
+      break;
+
+  if (*viewer)
+    opt_viewer = *viewer;
+  else
+    {
+      gchar *backends = backends_to_string ();
+
+      g_set_error(error,
+		  G_OPTION_ERROR,
+		  G_OPTION_ERROR_BAD_VALUE,
+		  "Available --backend options are: %s",
+		  backends);
+      g_free(backends);
+      ret = FALSE;
+    }
+
+  return ret;
+}
+
+
+static G_GNUC_NORETURN gboolean
+show_version(const char *name G_GNUC_UNUSED,
+	     const char *arg G_GNUC_UNUSED,
+	     gpointer    data G_GNUC_UNUSED,
+	     GError    **error G_GNUC_UNUSED)
+{
+  g_printf("%s (%s) %s\n", g_get_prgname (), PACKAGE_NAME, PACKAGE_VERSION);
+
+  if (PANGO_VERSION != pango_version())
+    g_printf("Linked Pango library has a different version: %s\n", pango_version_string ());
+
+  exit(0);
+}
+
+void
+parse_options (int argc, char *argv[])
+{
+  gchar *backend_options = backends_to_string ();
+  GOptionFlags backend_flag = backends_get_count () > 1 ? 0 : G_OPTION_FLAG_HIDDEN;
+  gchar *backend_desc = backend_description ();
+  GOptionEntry entries[] =
+  {
+    {"no-auto-dir",	0, G_OPTION_FLAG_REVERSE, G_OPTION_ARG_NONE,	&opt_auto_dir,
+     "No layout direction according to contents",			NULL},
+    {"backend",		0, backend_flag, G_OPTION_ARG_CALLBACK,		&parse_backend,
+     backend_desc,					     backend_options},
+    {"background",	0, 0, G_OPTION_ARG_CALLBACK,			&parse_background,
+     "Set the background color",     "red/#rrggbb/#rrggbbaa/transparent"},
+    {"no-display",	'q', G_OPTION_FLAG_REVERSE, G_OPTION_ARG_NONE,	&opt_display,
+     "Do not display (just write to file or whatever)",			NULL},
+    {"dpi",		0, 0, G_OPTION_ARG_INT,				&opt_dpi,
+     "Set the resolution",					    "number"},
+    {"align",		0, 0, G_OPTION_ARG_CALLBACK,			&parse_align,
+     "Text alignment",				         "left/center/right"},
+    {"ellipsize",	0, 0, G_OPTION_ARG_CALLBACK,			&parse_ellipsis,
+     "Ellipsization mode",				  "start/middle/end"},
+    {"font",		0, 0, G_OPTION_ARG_STRING,			&opt_font,
+     "Set the font description",			       "description"},
+    {"foreground",	0, 0, G_OPTION_ARG_CALLBACK,			&parse_foreground,
+     "Set the text color",		         "red/#rrggbb/#rrggbbaa"},
+    {"gravity",		0, 0, G_OPTION_ARG_CALLBACK,			&parse_gravity,
+     "Base gravity: glyph rotation",		"south/east/north/west/auto"},
+    {"gravity-hint",	0, 0, G_OPTION_ARG_CALLBACK,			&parse_gravity_hint,
+     "Gravity hint",				       "natural/strong/line"},
+    {"header",		0, 0, G_OPTION_ARG_NONE,			&opt_header,
+     "Display the options in the output",				NULL},
+    {"height",		0, 0, G_OPTION_ARG_INT,				&opt_height,
+     "Height in points (positive) or number of lines (negative) for ellipsizing", "+points/-numlines"},
+    {"hinting",		0, 0, G_OPTION_ARG_CALLBACK,			&parse_hinting,
+     "Hinting style",					    "none/auto/full"},
+    {"indent",		0, 0, G_OPTION_ARG_INT,				&opt_indent,
+     "Width in points to indent paragraphs",			    "points"},
+    {"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,
+     "Language to use for font selection",			    "en_US/etc"},
+    {"margin",		0, 0, G_OPTION_ARG_CALLBACK,			&parse_margin,
+     "Set the margin on the output in pixels",			    "CSS-style numbers in pixels"},
+    {"markup",		0, 0, G_OPTION_ARG_NONE,			&opt_markup,
+     "Interpret text as Pango markup",					NULL},
+    {"output",		'o', 0, G_OPTION_ARG_STRING,			&opt_output,
+     "Save rendered image to output file",			      "file"},
+    {"pangorc",		0, G_OPTION_FLAG_HIDDEN, G_OPTION_ARG_STRING,	&opt_pangorc,
+     "Deprecated",		      "file"},
+    {"pixels",		0, 0, G_OPTION_ARG_NONE,			&opt_pixels,
+     "Use pixel units instead of points (sets dpi to 72)",		NULL},
+    {"rtl",		0, 0, G_OPTION_ARG_NONE,			&opt_rtl,
+     "Set base direction to right-to-left",				NULL},
+    {"rotate",		0, 0, G_OPTION_ARG_DOUBLE,			&opt_rotate,
+     "Angle at which to rotate results",			   "degrees"},
+    {"runs",		'n', 0, G_OPTION_ARG_INT,			&opt_runs,
+     "Run Pango layout engine this many times",			   "integer"},
+    {"single-par",	0, 0, G_OPTION_ARG_NONE,			&opt_single_par,
+     "Enable single-paragraph mode",					NULL},
+    {"text",		't', 0, G_OPTION_ARG_STRING,			&opt_text,
+     "Text to display (instead of a file)",			    "string"},
+    {"version",		0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK, &show_version,
+     "Show version numbers",						NULL},
+    {"waterfall",	0, 0, G_OPTION_ARG_NONE,			&opt_waterfall,
+     "Create a waterfall display",					NULL},
+    {"width",		'w', 0, G_OPTION_ARG_INT,			&opt_width,
+     "Width in points to which to wrap lines or ellipsize",	    "points"},
+    {"wrap",		0, 0, G_OPTION_ARG_CALLBACK,			&parse_wrap,
+     "Text wrapping mode (needs a width to be set)",   "word/char/word-char"},
+    {NULL}
+  };
+  GError *error = NULL;
+  GError *parse_error = NULL;
+  GOptionContext *context;
+  size_t len;
+  const PangoViewer **viewer;
+
+  context = g_option_context_new ("- FILE");
+  g_option_context_add_main_entries (context, entries, NULL);
+
+  for (viewer = viewers; *viewer; viewer++)
+    if ((*viewer)->get_option_group)
+      {
+        GOptionGroup *group = (*viewer)->get_option_group (*viewer);
+	if (group)
+	  g_option_context_add_group (context, group);
+      }
+
+  if (!g_option_context_parse (context, &argc, &argv, &parse_error))
+  {
+    if (parse_error != NULL)
+      fail("%s", parse_error->message);
+    else
+      fail("Option parse error");
+    exit(1);
+  }
+  g_option_context_free(context);
+  g_free(backend_options);
+  g_free(backend_desc);
+
+  if (opt_pixels)
+    opt_dpi = 72;
+
+  if ((opt_text && argc != 1) || (!opt_text && argc != 2))
+    {
+      if (opt_text && argc != 1)
+	fail ("When specifying --text, no file should be given");
+
+      g_printerr ("Usage: %s [OPTION...] FILE\n", g_get_prgname ());
+      exit (1);
+    }
+
+  /* set up the backend */
+  if (!opt_viewer)
+    {
+      opt_viewer = *viewers;
+      if (!opt_viewer)
+	fail ("No viewer backend found");
+    }
+
+  /* Get the text
+   */
+  if (opt_text)
+    {
+      text = g_strdup (opt_text);
+      len = strlen (text);
+    }
+  else
+    {
+      if (!g_file_get_contents (argv[1], &text, &len, &error))
+	fail ("%s\n", error->message);
+    }
+
+  /* Strip one trailing newline
+   */
+  if (len > 0 && text[len - 1] == '\n')
+    len--;
+  if (len > 0 && text[len - 1] == '\r')
+    len--;
+  text[len] = '\0';
+
+  /* Make sure we have valid markup
+   */
+  if (opt_markup &&
+      !pango_parse_markup (text, -1, 0, NULL, NULL, NULL, &error))
+    fail ("Cannot parse input as markup: %s", error->message);
+}
+
+
+void
+finalize (void)
+{
+  g_free (text);
+}