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/*
* navqueue.c - this file is part of Geany, a fast and lightweight IDE
*
* Copyright 2007 Dave Moore <wrex006(at)gmail(dot)com>
* Copyright 2007-2012 Enrico Tröger <enrico(dot)troeger(at)uvena(dot)de>
* Copyright 2007-2012 Nick Treleaven <nick(dot)treleaven(at)btinternet(dot)com>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*
* Simple code navigation
*/
#include "geany.h"
#include "sciwrappers.h"
#include "document.h"
#include "utils.h"
#include "support.h"
#include "ui_utils.h"
#include "editor.h"
#include "navqueue.h"
#include "toolbar.h"
/* for the navigation history queue */
typedef struct
{
const gchar *file; /* This is the document's filename, in UTF-8 */
gint pos;
} filepos;
static GQueue *navigation_queue;
static guint nav_queue_pos;
static GtkAction *navigation_buttons[2];
void navqueue_init()
{
navigation_queue = g_queue_new();
nav_queue_pos = 0;
navigation_buttons[0] = toolbar_get_action_by_name("NavBack");
navigation_buttons[1] = toolbar_get_action_by_name("NavFor");
gtk_action_set_sensitive(navigation_buttons[0], FALSE);
gtk_action_set_sensitive(navigation_buttons[1], FALSE);
}
void navqueue_free()
{
while (! g_queue_is_empty(navigation_queue))
{
g_free(g_queue_pop_tail(navigation_queue));
}
g_queue_free(navigation_queue);
}
static void adjust_buttons(void)
{
if (g_queue_get_length(navigation_queue) < 2)
{
gtk_action_set_sensitive(navigation_buttons[0], FALSE);
gtk_action_set_sensitive(navigation_buttons[1], FALSE);
return;
}
if (nav_queue_pos == 0)
{
gtk_action_set_sensitive(navigation_buttons[0], TRUE);
gtk_action_set_sensitive(navigation_buttons[1], FALSE);
return;
}
/* forward should be sensitive since where not at the start */
gtk_action_set_sensitive(navigation_buttons[1], TRUE);
/* back should be sensitive if there's a place to go back to */
(nav_queue_pos < g_queue_get_length(navigation_queue) - 1) ?
gtk_action_set_sensitive(navigation_buttons[0], TRUE) :
gtk_action_set_sensitive(navigation_buttons[0], FALSE);
}
static gboolean
queue_pos_matches(guint queue_pos, const gchar *fname, gint pos)
{
if (queue_pos < g_queue_get_length(navigation_queue))
{
filepos *fpos = g_queue_peek_nth(navigation_queue, queue_pos);
return (utils_str_equal(fpos->file, fname) && fpos->pos == pos);
}
return FALSE;
}
static void add_new_position(const gchar *utf8_filename, gint pos)
{
filepos *npos;
guint i;
if (queue_pos_matches(nav_queue_pos, utf8_filename, pos))
return; /* prevent duplicates */
npos = g_new0(filepos, 1);
npos->file = utf8_filename;
npos->pos = pos;
/* if we've jumped to a new position from inside the queue rather than going forward */
if (nav_queue_pos > 0)
{
for (i = 0; i < nav_queue_pos; i++)
{
g_free(g_queue_pop_head(navigation_queue));
}
nav_queue_pos = 0;
}
g_queue_push_head(navigation_queue, npos);
adjust_buttons();
}
/**
* Adds old file position and new file position to the navqueue, then goes to the new position.
*
* @param old_doc The document of the previous position, if set as invalid (@c NULL) then no old
* position is set
* @param new_doc The document of the new position, must be valid.
* @param line the line number of the new position. It is counted with 1 as the first line, not 0.
*
* @return @c TRUE if the cursor has changed the position to @a line or @c FALSE otherwise.
**/
gboolean navqueue_goto_line(GeanyDocument *old_doc, GeanyDocument *new_doc, gint line)
{
gint pos;
g_return_val_if_fail(new_doc != NULL, FALSE);
g_return_val_if_fail(line >= 1, FALSE);
pos = sci_get_position_from_line(new_doc->editor->sci, line - 1);
/* first add old file position */
if (old_doc != NULL && old_doc->file_name)
{
gint cur_pos = sci_get_current_position(old_doc->editor->sci);
add_new_position(old_doc->file_name, cur_pos);
}
/* now add new file position */
if (new_doc->file_name)
{
add_new_position(new_doc->file_name, pos);
}
return editor_goto_pos(new_doc->editor, pos, TRUE);
}
static gboolean goto_file_pos(const gchar *file, gint pos)
{
GeanyDocument *doc = document_find_by_filename(file);
if (doc == NULL)
return FALSE;
return editor_goto_pos(doc->editor, pos, TRUE);
}
void navqueue_go_back()
{
filepos *fprev;
/* return if theres no place to go back to */
if (g_queue_is_empty(navigation_queue) ||
nav_queue_pos >= g_queue_get_length(navigation_queue) - 1)
return;
/* jump back */
fprev = g_queue_peek_nth(navigation_queue, nav_queue_pos + 1);
if (goto_file_pos(fprev->file, fprev->pos))
{
nav_queue_pos++;
}
else
{
/** TODO: add option to re open the file */
g_free(g_queue_pop_nth(navigation_queue, nav_queue_pos + 1));
}
adjust_buttons();
}
void navqueue_go_forward()
{
filepos *fnext;
if (nav_queue_pos < 1 ||
nav_queue_pos >= g_queue_get_length(navigation_queue))
return;
/* jump forward */
fnext = g_queue_peek_nth(navigation_queue, nav_queue_pos - 1);
if (goto_file_pos(fnext->file, fnext->pos))
{
nav_queue_pos--;
}
else
{
/** TODO: add option to re open the file */
g_free(g_queue_pop_nth(navigation_queue, nav_queue_pos - 1));
}
adjust_buttons();
}
static gint find_by_filename(gconstpointer a, gconstpointer b)
{
if (utils_str_equal(((const filepos*)a)->file, (const gchar*) b))
return 0;
else
return 1;
}
/* Remove all elements with the given filename */
void navqueue_remove_file(const gchar *filename)
{
GList *match;
if (filename == NULL)
return;
while ((match = g_queue_find_custom(navigation_queue, filename, find_by_filename)))
{
g_free(match->data);
g_queue_delete_link(navigation_queue, match);
}
adjust_buttons();
}
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