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mtxtextview.c
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mtxtextview.c
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/* vim:set ts=8 sw=4 et: */
/*
MDVIEW MTX
Copyright (C) 2024 step, https://github.com/step-
Licensed under the GNU General Public License Version 2
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
2024-08-15 step:
This file was derived from mdview3 markdown-text-view.c with substantial changes
and feature additions for MTX.
*/
/*
* Markdown Text View
* GtkTextView subclass that supports Markdown syntax
*
* Copyright (C) 2009 Leandro Pereira <[email protected]>
* Copyright (C) 2015 James B
* Copyright (C) 2023 step
* Portions Copyright (C) 2007-2008 Richard Hughes <[email protected]>
* Portions Copyright (C) GTK+ Team (based on hypertext textview demo)
*
* Licensed under the GNU General Public License Version 2
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <gdk/gdkkeysyms.h>
#include <string.h>
#include "mtxtextview.h"
#include "mtxdbg.h"
#define MTX_TEXT_VIEW_LEFT_MARGIN 10
#define MTX_TEXT_VIEW_RIGHT_MARGIN 10
#define MTX_TEXT_VIEW_PIXEL_ABOVE_LINE 3
#define MTX_TEXT_VIEW_PIXEL_BELOW_LINE 3
static GdkCursor *hand_cursor = NULL;
static GdkScreen *screen = NULL;
static GdkDisplay *display = NULL;
#ifdef MTX_TEXT_VIEW_DEBUG
gchar *gl_text_view_debug_markup_file = NULL;
#endif
G_DEFINE_TYPE(MtxTextView, mtx_text_view, GTK_TYPE_TEXT_VIEW);
enum {
LINK_CLICKED,
HOVERING_OVER_LINK,
HOVERING_OVER_TEXT,
FILE_LOAD_COMPLETE,
LAST_SIGNAL
};
static guint mtx_text_view_signals[LAST_SIGNAL] = { 0 };
GtkWidget *mtx_text_view_new()
{
return g_object_new(TYPE_MTX_TEXT_VIEW, NULL);
}
static void mtx_text_view_dispose (GObject *object);
static void mtx_text_view_finalize (GObject *object);
static void mtx_text_view_class_init (MtxTextViewClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = mtx_text_view_dispose;
object_class->finalize = mtx_text_view_finalize;
screen = gdk_screen_get_default ();
display = gdk_screen_get_display (screen);
if (!hand_cursor)
{
hand_cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
}
mtx_text_view_signals[LINK_CLICKED] =
g_signal_new ("link-clicked", G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET
(MtxTextViewClass, link_clicked), NULL, NULL,
g_cclosure_marshal_VOID__STRING, G_TYPE_NONE, 1,
G_TYPE_STRING);
mtx_text_view_signals[HOVERING_OVER_LINK] =
g_signal_new ("hovering-over-link", G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (MtxTextViewClass,
hovering_over_link), NULL, NULL,
g_cclosure_marshal_VOID__STRING, G_TYPE_NONE, 1,
G_TYPE_STRING);
mtx_text_view_signals[HOVERING_OVER_TEXT] =
g_signal_new ("hovering-over-text", G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (MtxTextViewClass,
hovering_over_text), NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
mtx_text_view_signals[FILE_LOAD_COMPLETE] =
g_signal_new ("file-load-complete", G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (MtxTextViewClass,
file_load_complete), NULL, NULL,
g_cclosure_marshal_VOID__STRING, G_TYPE_NONE, 1,
G_TYPE_STRING);
}
/**
_text_buffer_insert_markup:
*/
/*
2024-08-08 step:
The code in this function was modified from an original patch that
Tim-Philipp Müller proposed to the GTK maintainers for GTK 2.6 in 2004,
https://bugzilla.gnome.org/show_bug.cgi?id=59390. The patch was never merged
but in 2014 it made its way into GTK3's gtk_text_buffer_insert_markup(),
https://bugzilla.gnome.org/show_bug.cgi?id=59390#c28.
Let's give credit where credit's due.
LIMITATION:
This code, as well as GTK3's own gtk_text_buffer_insert_markup and the original
patch, all cannot render the following markup correctly:
<span font="monospace"><i>em</i> and <b>strong</b></span>
indeed <i> and <b> are not rendered. You can easily double-check GTK3 with
yadu --formatted --text-info <<< 'insert the test markup above'
Interestingly, GtkLabel _can_ render the markup correctly. Check with
yad --text='insert the test markup above'
This works for GTK2 and GTK3. However, their code is hefty and outside the API.
So it becomes essential for our renderer not to embed Pango style tags in
in an outer <span font="..."> otherwise the viewer won't render the styles.
*/
static void
_text_buffer_insert_markup (GtkTextBuffer *buffer,
GtkTextIter *iter,
const gchar *markup)
{
PangoAttrIterator *paiter;
PangoAttrList *attrlist;
GtkTextTagTable *tags;
GtkTextMark *mark;
GError *error = NULL;
gchar *text;
g_return_if_fail (GTK_IS_TEXT_BUFFER (buffer));
g_return_if_fail (markup != NULL);
if (markup[0] == '\0')
{
return;
}
if (!pango_parse_markup (markup, -1, 0, &attrlist, &text, NULL, &error))
{
g_warning ("Invalid markup string: %s", error->message);
g_error_free (error);
return;
}
/* text without markup */
if (attrlist == NULL)
{
gtk_text_buffer_insert (buffer, iter, text, -1);
g_free (text);
return;
}
mark = gtk_text_buffer_create_mark (buffer, NULL, iter, FALSE);
paiter = pango_attr_list_get_iterator (attrlist);
tags = gtk_text_buffer_get_tag_table (buffer);
do
{
gint start, end, ival;
PangoAttribute *attr;
GtkTextTag *tag = gtk_text_tag_new (NULL);
pango_attr_iterator_range (paiter, &start, &end);
if (end == G_MAXINT)
{
end = start - 1; /* chunk size > max signed int */
}
/* https://docs.gtk.org/Pango/enum.AttrType.html */
#if MTX_TEXT_VIEW_DEBUG > 0
fprintf (stderr, "%s (", __FUNCTION__);
for (gint i = start; i < end; i++)
{
fputc (text[i], stderr);
}
fputc (')', stderr);
#endif
if ((attr = pango_attr_iterator_get (paiter, PANGO_ATTR_LANGUAGE)))
{
g_object_set (tag, "language",
pango_language_to_string (((PangoAttrLanguage *)
attr)->value), NULL);
}
if ((attr = pango_attr_iterator_get (paiter, PANGO_ATTR_FAMILY)))
{
g_object_set (tag, "family", ((PangoAttrString *) attr)->value,
NULL);
}
if ((attr = pango_attr_iterator_get (paiter, PANGO_ATTR_STYLE)))
{
ival = ((PangoAttrInt *) attr)->value;
g_object_set (tag, "style", ival, NULL);
#if MTX_TEXT_VIEW_DEBUG > 0
fprintf (stderr, " style %d", ival);
#endif
}
if ((attr = pango_attr_iterator_get (paiter, PANGO_ATTR_WEIGHT)))
{
ival = ((PangoAttrInt *) attr)->value;
g_object_set (tag, "weight", ival, NULL);
#if MTX_TEXT_VIEW_DEBUG > 0
fprintf (stderr, " weight %d", ival);
#endif
}
if ((attr = pango_attr_iterator_get (paiter, PANGO_ATTR_VARIANT)))
{
g_object_set (tag, "variant", ((PangoAttrInt *) attr)->value, NULL);
}
if ((attr = pango_attr_iterator_get (paiter, PANGO_ATTR_STRETCH)))
{
g_object_set (tag, "stretch", ((PangoAttrInt *) attr)->value, NULL);
}
if ((attr = pango_attr_iterator_get (paiter, PANGO_ATTR_SIZE)))
{
ival = ((PangoAttrInt *) attr)->value;
g_object_set (tag, "size", ival, NULL);
#if MTX_TEXT_VIEW_DEBUG > 0
fprintf (stderr, " size %d", ival);
#endif
}
if ((attr = pango_attr_iterator_get (paiter, PANGO_ATTR_FONT_DESC)))
{
g_object_set (tag, "font-desc",
((PangoAttrFontDesc *) attr)->desc, NULL);
}
if ((attr = pango_attr_iterator_get (paiter, PANGO_ATTR_FOREGROUND)))
{
GdkColor col = { 0,
((PangoAttrColor *) attr)->color.red,
((PangoAttrColor *) attr)->color.green,
((PangoAttrColor *) attr)->color.blue
};
g_object_set (tag, "foreground-gdk", &col, NULL);
}
if ((attr = pango_attr_iterator_get (paiter, PANGO_ATTR_BACKGROUND)))
{
GdkColor col = { 0,
((PangoAttrColor *) attr)->color.red,
((PangoAttrColor *) attr)->color.green,
((PangoAttrColor *) attr)->color.blue
};
g_object_set (tag, "background-gdk", &col, NULL);
}
if ((attr = pango_attr_iterator_get (paiter, PANGO_ATTR_UNDERLINE)))
{
ival = ((PangoAttrInt *) attr)->value;
g_object_set (tag, "underline", ival, NULL);
#if MTX_TEXT_VIEW_DEBUG > 0
fprintf (stderr, " underline %d", ival);
#endif
}
if ((attr = pango_attr_iterator_get (paiter, PANGO_ATTR_STRIKETHROUGH)))
{
g_object_set (tag, "strikethrough",
(gboolean) (((PangoAttrInt *) attr)->value != 0),
NULL);
}
if ((attr = pango_attr_iterator_get (paiter, PANGO_ATTR_RISE)))
{
g_object_set (tag, "rise", ((PangoAttrInt *) attr)->value, NULL);
}
if ((attr = pango_attr_iterator_get (paiter, PANGO_ATTR_SCALE)))
{
g_object_set (tag, "scale", ((PangoAttrFloat *) attr)->value, NULL);
}
/* TODO: add attributes underline-gdk (?-rgba), strikethrough-gdk (?-rgba)
fallback (int), letter-spacing (int), font-features (string) */
#if MTX_TEXT_VIEW_DEBUG > 0
{
gchar *font = NULL;
g_object_get (G_OBJECT (tag), "font", &font, NULL);
fprintf (stderr, " font %s", font);
g_free (font);
}
fputc ('\n', stderr);
#endif
gtk_text_tag_table_add (tags, tag);
gtk_text_buffer_insert_with_tags (buffer, iter, text + start,
end - start, tag, NULL);
g_object_unref (tag);
/* mark moves right after appended text */
gtk_text_buffer_get_iter_at_mark (buffer, iter, mark);
}
while (pango_attr_iterator_next (paiter));
gtk_text_buffer_delete_mark (buffer, mark);
pango_attr_iterator_destroy (paiter);
pango_attr_list_unref (attrlist);
g_free (text);
}
/**
mtx_text_view_get_link_at_iter:
@self:
@iter:
@link_dest: pointer to a return destionation for the link destination. NULLABLE.
@length: pointer to a return destination for the link text length (in
characters). NULLABLE.
Returns: `link_dest_id` > 0 if @iter is somewhere inside a link text span, and
sets *@length to the length (in characters) of the link text. Otherwise it
returns -1 and *@length is unchanged. Note that a successful return value
does not imply that @iter is at the start of the link text span.
*/
gint
mtx_text_view_get_link_at_iter (MtxTextView *self,
GtkTextIter *iter,
const gchar **link_dest,
guint *length)
{
GSList *tags = NULL, *tagp = NULL;
gint id = -1;
tags = gtk_text_iter_get_tags (iter);
for (tagp = tags; tagp != NULL; tagp = tagp->next)
{
GtkTextTag *tag = tagp->data;
gchar *font = NULL;
g_object_get (G_OBJECT (tag), "font", &font, NULL);
/* prereq for (concat of) MTX_TAG_DEST_* */
if (strstr (font, "@dest=") == NULL)
{
g_free (font);
continue;
}
id = mtx_cmm_tag_get_info (self->markdown, font,
MTX_TAG_DEST_LINK_URI_ID);
if (id >= 0)
{
if (length)
{
*length = mtx_cmm_tag_get_info (self->markdown, font,
MTX_TAG_DEST_LINK_TXT_LEN);
}
if (link_dest)
{
*link_dest = mtx_cmm_get_link_dest (self->markdown, id);
}
g_free (font);
break;
}
}
if (tags != NULL)
{
g_slist_free (tags);
}
return id;
}
/**
set_cursor_and_signal_on_hover:
*/
static void
set_cursor_and_signal_on_hover (MtxTextView *self,
gint x,
gint y)
{
GtkTextIter iter;
gboolean hovering = FALSE;
const gchar *link_dest = NULL;
gtk_text_view_get_iter_at_location (GTK_TEXT_VIEW (self), &iter, x, y);
(void) mtx_text_view_get_link_at_iter (self, &iter, &link_dest, NULL);
hovering = link_dest != NULL;
if (hovering != self->hovering_over_link)
{
self->hovering_over_link = hovering;
if (self->hovering_over_link)
{
/* link_dest format: <uri-encoded>\n<verbatim> */
g_signal_emit (self, mtx_text_view_signals[HOVERING_OVER_LINK],
0, /* verbatim */ strchr (link_dest, '\n') + 1);
gdk_window_set_cursor (gtk_text_view_get_window
(GTK_TEXT_VIEW (self),
GTK_TEXT_WINDOW_TEXT), hand_cursor);
}
else
{
g_signal_emit (self, mtx_text_view_signals[HOVERING_OVER_TEXT], 0);
gdk_window_set_cursor (gtk_text_view_get_window
(GTK_TEXT_VIEW (self), GTK_TEXT_WINDOW_TEXT),
NULL);
}
}
}
/**
motion_notify_event:
Update the cursor image while the pointer moves.
Side effects: if the pointer is clicked over links, a link-navigation signal
will be emitted.
*/
static gboolean
motion_notify_event (GtkWidget *self,
GdkEventMotion *event)
{
gint x, y;
gtk_text_view_window_to_buffer_coords (GTK_TEXT_VIEW (self),
GTK_TEXT_WINDOW_WIDGET,
event->x, event->y, &x, &y);
set_cursor_and_signal_on_hover (MTX_TEXT_VIEW (self), x, y);
#if !GTK_CHECK_VERSION(3,0,0)
gdk_window_get_pointer (gtk_widget_get_window (self), NULL, NULL, NULL);
#endif
return FALSE;
}
/*
visibility_notify_event:
Also update the cursor image if the window becomes visible, e.g.
another window obscuring our window is iconified.
*/
static gboolean
visibility_notify_event (GtkWidget *self,
GdkEventVisibility *event __attribute__((unused)))
{
gint wx = 0, wy = 0, bx, by;
#if !GTK_CHECK_VERSION(3,0,0)
gdk_window_get_pointer (gtk_widget_get_window (self), &wx, &wy, NULL);
#else
GdkDevice *device = NULL, *pointer_device = NULL;
device = gdk_event_get_device ((GdkEvent *) event);
if (device)
{
pointer_device = gdk_device_get_associated_device (device);
}
if (pointer_device)
{
gdk_device_get_position (pointer_device, NULL, &wx, &wy);
}
#endif
gtk_text_view_window_to_buffer_coords (GTK_TEXT_VIEW (self),
GTK_TEXT_WINDOW_WIDGET,
wx, wy, &bx, &by);
set_cursor_and_signal_on_hover (MTX_TEXT_VIEW (self), bx, by);
return FALSE;
}
/**
follow_if_link:
*/
static void
follow_if_link (GtkWidget *widget,
GtkTextIter *iter)
{
MtxTextView *self = MTX_TEXT_VIEW (widget);
const gchar *link_dest = NULL;
(void) mtx_text_view_get_link_at_iter (self, iter, &link_dest, NULL);
if (link_dest != NULL)
{
/* link_dest format: <uri-encoded>\n<verbatim> */
g_signal_emit (self, mtx_text_view_signals[LINK_CLICKED], 0, link_dest);
}
}
/**
_text_buffer_get_cursor:
@buffer:
@iter: #GtkTextIter at cursor position, returned.
*/
inline static void
_text_buffer_get_cursor (GtkTextBuffer *buffer,
GtkTextIter *iter)
{
GtkTextMark *mark = gtk_text_buffer_get_insert (buffer);
gtk_text_buffer_get_iter_at_mark (buffer, iter, mark);
/* the 'insert' mark is permanent */
}
static gboolean
key_press_event (GtkWidget *self,
GdkEventKey *event)
{
GtkTextIter iter;
switch (event->keyval)
{
case GDK_KEY_Return:
case GDK_KEY_KP_Enter:
_text_buffer_get_cursor ((MTX_TEXT_VIEW (self))->buffer, &iter);
follow_if_link (self, &iter);
break;
default:
break;
}
return FALSE;
}
static gboolean
event_after (GtkWidget *self,
GdkEvent *ev)
{
GtkTextIter start, end, iter;
GdkEventButton *event;
gint x, y;
if (ev->type != GDK_BUTTON_RELEASE)
{
return FALSE;
}
event = (GdkEventButton *) ev;
if (event->button != 1)
{
return FALSE;
}
gtk_text_buffer_get_selection_bounds ((MTX_TEXT_VIEW (self))->buffer,
&start, &end);
if (gtk_text_iter_get_offset (&start) != gtk_text_iter_get_offset (&end))
{
return FALSE;
}
/* we get here iff event == button 1 released && nothing's selected */
gtk_text_view_window_to_buffer_coords (GTK_TEXT_VIEW (self),
GTK_TEXT_WINDOW_WIDGET,
event->x, event->y, &x, &y);
gtk_text_view_get_iter_at_location (GTK_TEXT_VIEW (self), &iter, x, y);
follow_if_link (self, &iter);
return FALSE;
}
/**
*/
void
_text_tag_table_remove_foreach (GtkTextTag *tag,
gpointer *data)
{
gchar *name;
g_object_get (tag, "name", &name, NULL);
if (name == NULL)
{
gtk_text_tag_table_remove ((GtkTextTagTable *) data, tag);
}
g_free (name);
}
/**
mtx_text_view_reset:
Reset the text buffer, and remove all anonymous tags for which the application
doesn't hold a reference.
*/
void
mtx_text_view_reset (MtxTextView *self)
{
g_return_if_fail (IS_MTX_TEXT_VIEW (self));
GtkTextTagTable *table = gtk_text_buffer_get_tag_table (self->buffer);
gtk_text_tag_table_foreach (table,
(GtkTextTagTableForeach)
_text_tag_table_remove_foreach, table);
gtk_text_buffer_set_text (self->buffer, "\n", 1);
}
/**
get_pixbuf_from_id:
Get an image pixbuf for a link_dest id.
@referrer: absolute pathname (not necessarily directory) to fall back to when
resolving the image path. NULLABLE.
Return: pointer to #GdkPixbuf or NULL if no image can be found.
*/
static GdkPixbuf *
get_pixbuf_from_id (MtxTextView *self,
const gint id,
const gchar *referrer)
{
GdkPixbuf *pixbuf = NULL;
const gchar *link_dest;
gchar *path, *pi = NULL;
if (id < 0)
{
return NULL;
}
link_dest = mtx_cmm_get_link_dest (self->markdown, id);
/* link_dest format: <uri-encoded>\n<verbatim> */
/* get <verbatim> in directory context */
path = g_build_filename (self->image_directory,
strchr (link_dest, '\n') + 1, NULL);
if (self->auto_languages != NULL)
{
pi = mtx_text_view_auto_lang_find (self, path);
}
pixbuf = gdk_pixbuf_new_from_file (pi ? pi : path, NULL);
if (pixbuf == NULL && referrer != NULL)
{
/* retry relative to referrer's directory */
gchar *dir = g_path_get_dirname (referrer);
g_free (path);
path = g_build_filename (dir, strchr (link_dest, '\n') + 1, NULL);
g_free (pi);
pi = NULL;
if (self->auto_languages != NULL)
{
pi = mtx_text_view_auto_lang_find (self, path);
}
g_free (dir);
pixbuf = gdk_pixbuf_new_from_file (path, NULL);
}
g_free (pi);
g_free (path);
return pixbuf;
}
/**
*/
static void
_clear_link_marks_el (gpointer el, gpointer user_data)
{
GtkTextBuffer *buffer = GTK_TEXT_BUFFER (user_data);
GtkTextMark *mark = ((MtxTextViewLinkInfo *) el)->mark;
gtk_text_buffer_delete_mark (buffer, mark);
g_free (el);
}
/**
mtx_text_view_link_count:
Returns: the number of markdown links in the page.
*/
guint
mtx_text_view_link_count (MtxTextView *self)
{
return self->link_marks->len;
}
/**
mtx_text_view_link_info_get:
Returns: a pointer to the #MtxTextView structure at the given index or NULL
for an out-of-range index. The instance owns the returned memory.
*/
const MtxTextViewLinkInfo *
mtx_text_view_link_info_get (MtxTextView *self,
const guint index_)
{
return g_ptr_array_index (self->link_marks, index_);
}
/**
mtx_text_view_link_info_get_near_offset:
@offset: %MtxTextView buffer offset.
@direction: -1 backward/before the offset; 1 forward/after the offset.
If @direction is -1 and the offset is before the first %MtxTextViewLinkInfo in
the buffer, the function returns the last %MtxTextViewLinkInfo in the buffer.
If @direction is 1 and the offset is after the last %MtxTextViewLinkInfo in the
buffer, the function returns the first %MtxTextViewLinkInfo in the buffer.
Returns: a pointer to the #MtxTextViewLinkInfo structure near the given offset
or NULL if there are no structures. The instance owns the returned memory.
*/
const MtxTextViewLinkInfo *
mtx_text_view_link_info_get_near_offset (MtxTextView *self,
guint offset,
const gint direction)
{
MtxTextViewLinkInfo *p;
gint i;
guint off;
gboolean found = FALSE;
GtkTextIter it;
if (self->link_marks->len == 0)
{
return NULL;
}
if (direction > 0)
{
i = -1;
do {
i++;
p = (MtxTextViewLinkInfo *) g_ptr_array_index (self->link_marks, i);
gtk_text_buffer_get_iter_at_mark (self->buffer, &it, p->mark);
off = gtk_text_iter_get_offset (&it);
if (off > offset)
{
found = TRUE;
}
} while (!found && i < (int) self->link_marks->len - 1);
if (!found)
{
p = (MtxTextViewLinkInfo *) g_ptr_array_index (self->link_marks, 0);
}
}
else
{
i = self->link_marks->len;
do {
i--;
p = (MtxTextViewLinkInfo *) g_ptr_array_index (self->link_marks, i);
gtk_text_buffer_get_iter_at_mark (self->buffer, &it, p->mark);
off = gtk_text_iter_get_offset (&it);
if (off < offset)
{
found = TRUE;
}
} while (!found && i > 0);
if (!found)
{
p = (MtxTextViewLinkInfo *)
g_ptr_array_index (self->link_marks, self->link_marks->len - 1);
}
}
return p;
}
/**
load_images_and_mark_links:
Resolve all image text tags in the text view.
Also save the position of markdown link text tags.
@self:
@referrer: absolute pathname (not necessarily directory) to fall back to when
resolving image paths. NULLABLE.
*/
static void
load_images_and_mark_links (MtxTextView *self,
const gchar *referrer)
{
if (referrer != NULL)
{
g_return_if_fail (g_path_is_absolute (referrer));
}
GtkTextIter iter;
GSList *tags, *tagp;
if (self->link_marks->len > 0)
{
g_ptr_array_foreach (self->link_marks, _clear_link_marks_el,
self->buffer);
g_ptr_array_set_size (self->link_marks, 0);
}
gtk_text_buffer_get_start_iter (self->buffer, &iter);
do
{
gboolean done = FALSE;
gint forward_chars = -1;
tags = gtk_text_iter_get_tags (&iter);
for (tagp = tags; tagp != NULL && !done; tagp = tagp->next)
{
GtkTextTag *tag = tagp->data;
gchar *font = NULL;
MtxTextViewLinkInfo *link_info = NULL;
gint id;
/*
Markdown links and images piggyback the font tag.
Markdown link text can embed an image, e.g.
[](https://sun.stars.org)
which yields the following pango markup (all on one line):
<span font="@dest=Lu1dest=Tl5" fgcolor="#048" underline="single">
<span font="@dest=Ip0" underline="double">image of the sun</span>
</span>
Conversely, markdown image alt text can embed a link, e.g.
](sun.jpg)
but the link is flattened, yielding the following pango markup:
<span font="@dest=Ip0" underline="double">link to stars.org</span>
Therefore,
we need to process links and images independently of each other;
and we need to process link tags before image tags.
*/
g_object_get (G_OBJECT (tag), "font", &font, NULL);
id = mtx_cmm_tag_get_info (self->markdown, font,
MTX_TAG_DEST_LINK_URI_ID);
if (id >= 0) /* Markdown link text. */
{
/* Save a text mark for link navigation. */
link_info = g_malloc (sizeof (MtxTextViewLinkInfo));
link_info->mark =
gtk_text_buffer_create_mark (self->buffer, NULL, &iter, TRUE);
link_info->link_dest_id = id;
link_info->llen =
mtx_cmm_tag_get_info (self->markdown, font,
MTX_TAG_DEST_LINK_TXT_LEN);
g_ptr_array_add (self->link_marks, link_info);
/* Skip over contained tags, which would beget
bogus link navigation stops. */
forward_chars = link_info->llen;
done = TRUE;
}
id = mtx_cmm_tag_get_info (self->markdown, font,
MTX_TAG_DEST_IMAGE_PATH_ID);
GdkPixbuf *pixbuf = get_pixbuf_from_id (self, id, referrer);
if (pixbuf != NULL) /* Markdown image. */
{ /* Replace text with pixbuf. */
GtkTextMark *mark;
GtkTextIter start;
if (forward_chars < 0)
{
mark =
gtk_text_buffer_create_mark (self->buffer, NULL, &iter,
FALSE);
start = iter;
/* Image isn't embedded in markdown link text. */
gtk_text_iter_forward_to_tag_toggle (&iter, tag);
gtk_text_buffer_delete (self->buffer, &start, &iter);
gtk_text_buffer_insert_pixbuf (self->buffer, &iter, pixbuf);
}
else
{
/* Image is embedded in a link so set up hover target. */
/* TODO support image + text, e.g.
[Our star the Sun ](stars.md) */
mark =
gtk_text_buffer_create_mark (self->buffer, NULL, &iter,
TRUE);
gtk_text_buffer_insert (self->buffer, &iter, " ", 1);
gtk_text_iter_forward_to_tag_toggle (&iter, tag);
gtk_text_buffer_get_iter_at_mark (self->buffer, &start,
mark);
gtk_text_iter_forward_chars (&start, 1);
gtk_text_buffer_delete (self->buffer, &start, &iter);
gtk_text_buffer_insert_pixbuf (self->buffer, &iter, pixbuf);
gtk_text_buffer_insert (self->buffer, &iter, " ", 1);
gtk_text_buffer_get_iter_at_mark (self->buffer, &start,
mark);
gtk_text_buffer_apply_tag (self->buffer, tag, &start,
&iter);
link_info->llen = forward_chars = 3;
}
g_object_unref (pixbuf);
gtk_text_buffer_delete_mark (self->buffer, mark);
done = TRUE;
}
g_free (font);
}
if (forward_chars > 0)
{
gtk_text_iter_forward_chars (&iter, forward_chars);
}
if (tags)
{
g_slist_free (tags);
}
}
while (gtk_text_iter_forward_to_tag_toggle (&iter, NULL));
}
#if MTX_TEXT_VIEW_DEBUG > 2
__attribute__((unused))
static void _print_slice (const int, const GtkTextIter *, const GtkTextIter);
static void
_print_slice (const int fd, const GtkTextIter *start, const GtkTextIter *end)
{
gchar *slice = gtk_text_buffer_get_slice (self->buffer, start, end, TRUE);
gint start_pos = gtk_text_iter_get_offset (start);
gint end_pos = gtk_text_iter_get_offset (end);
dprintf (fd, "[%d, %d](%s)\n", start_pos, end_pos, slice);
g_free (slice);
}
#endif
/**
_get_string_pixel_size:
@string:
@tag: nullable
@width:
@height:
*/
static void
_get_string_pixel_size (MtxTextView *self,
gchar *string,
GtkTextTag *tag,
guint *width,
guint *height)
{
PangoContext *context = gtk_widget_get_pango_context (GTK_WIDGET (self));
PangoFontDescription *desc = pango_context_get_font_description (context);
PangoLayout *layout = pango_layout_new (context);
pango_layout_set_text (layout, string, -1);
pango_layout_set_font_description (layout, desc);
if (tag)
{
/*
Currently the returned width and height are only accurate if @tag doesn't
override the default font properties that affect @layout size. (@tag derives
from the markup, if any, that wrapped the markdown text leading to @string).
To remove this limitation:
TODO convert tag properties to pango markup and apply to layout.
*/;
}
pango_layout_get_pixel_size (layout, (int *) width, (int *) height);
g_object_unref (layout);
}
/**
_indent_slice_lines:
@start:
@end:
@width: left-hanging indent in pixels of the first line at @start; after the
first line @width becomes the left margin in pixels for the remaining lines.
Note that if @end is not a line ending itself, then the indentation range
will extend through to the first line ending after @end.
*/
void
_indent_slice_lines (MtxTextView *self,
const GtkTextIter *start,
const GtkTextIter *end,
const guint width)
{
GtkTextTag *indentt = NULL, *margint = NULL;
GtkTextIter its = *start, ite = *end;
gboolean multiline;
GtkTextBuffer *buffer = gtk_text_iter_get_buffer (&its);
if (width == 0)
{
gtk_text_buffer_apply_tag (buffer, self->indent_base_tag, &its, &ite);
gtk_text_buffer_apply_tag (buffer, self->margin_base_tag, &its, &ite);
#if MTX_TEXT_VIEW_DEBUG > 2
dprintf (2, "MARGIN % 4d px ", width);
_print_slice (2, &its, &ite);
#endif
}
else
{
GtkTextIter line_end = its;
multiline = gtk_text_iter_forward_to_line_end (&line_end)
&& gtk_text_iter_compare (&line_end, &ite) < 0;
#if MTX_TEXT_VIEW_DEBUG > 2
dprintf (2, "INDENT % 4d px ", -width);
_print_slice (2, &its, &line_end);
#endif
/* hanging indent */
indentt =
gtk_text_buffer_create_tag (buffer, NULL, "indent", -width, NULL);
gtk_text_buffer_apply_tag (buffer, indentt, &its, &line_end);
if (multiline && gtk_text_iter_forward_line (&its))
{
#if MTX_TEXT_VIEW_DEBUG > 2
dprintf (2, "MARGIN % 4d px ", width);
_print_slice (2, &its, &ite);
#endif
margint =
gtk_text_buffer_create_tag (buffer, NULL, "left-margin",
width +
MTX_TEXT_VIEW_LEFT_MARGIN, NULL);
gtk_text_buffer_apply_tag (buffer, margint, &its, &ite);