mc/edit/bookmark.c

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/* editor book mark handling
Copyright (C) 1996, 1997 the Free Software Foundation
Authors: 1996, 1997 Paul Sheer
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.
*/
#include <config.h>
#include <ctype.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "../src/global.h"
#include "edit.h"
#include "edit-widget.h"
/* note, if there is more than one bookmark on a line, then they are
appended after each other and the last one is always the one found
by book_mark_found() i.e. last in is the one seen */
static inline struct _book_mark *double_marks (WEdit * edit, struct _book_mark *p)
{
(void) edit;
if (p->next)
while (p->next->line == p->line)
p = p->next;
return p;
}
/* returns the first bookmark on or before this line */
struct _book_mark *book_mark_find (WEdit * edit, int line)
{
struct _book_mark *p;
if (!edit->book_mark) {
/* must have an imaginary top bookmark at line -1 to make things less complicated */
edit->book_mark = g_malloc0 (sizeof (struct _book_mark));
edit->book_mark->line = -1;
return edit->book_mark;
}
for (p = edit->book_mark; p; p = p->next) {
if (p->line > line)
break; /* gone past it going downward */
if (p->line <= line) {
if (p->next) {
if (p->next->line > line) {
edit->book_mark = p;
return double_marks (edit, p);
}
} else {
edit->book_mark = p;
return double_marks (edit, p);
}
}
}
for (p = edit->book_mark; p; p = p->prev) {
if (p->next)
if (p->next->line <= line)
break; /* gone past it going upward */
if (p->line <= line) {
if (p->next) {
if (p->next->line > line) {
edit->book_mark = p;
return double_marks (edit, p);
}
} else {
edit->book_mark = p;
return double_marks (edit, p);
}
}
}
return 0; /* can't get here */
}
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/* returns true if a bookmark exists at this line of color c */
int book_mark_query_color (WEdit * edit, int line, int c)
{
struct _book_mark *p;
if (!edit->book_mark)
return 0;
for (p = book_mark_find (edit, line); p; p = p->prev) {
if (p->line != line)
return 0;
if (p->c == c)
return 1;
}
return 0;
}
/* insert a bookmark at this line */
void
book_mark_insert (WEdit *edit, int line, int c)
{
struct _book_mark *p, *q;
p = book_mark_find (edit, line);
#if 0
if (p->line == line) {
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/* already exists, so just change the color */
if (p->c != c) {
edit->force |= REDRAW_LINE;
p->c = c;
}
return;
}
#endif
edit->force |= REDRAW_LINE;
/* create list entry */
q = g_malloc0 (sizeof (struct _book_mark));
q->line = line;
q->c = c;
q->next = p->next;
/* insert into list */
q->prev = p;
if (p->next)
p->next->prev = q;
p->next = q;
}
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/* remove a bookmark if there is one at this line matching this color - c of -1 clear all */
/* returns non-zero on not-found */
int book_mark_clear (WEdit * edit, int line, int c)
{
struct _book_mark *p, *q;
int r = 1;
if (!edit->book_mark)
return r;
for (p = book_mark_find (edit, line); p; p = q) {
q = p->prev;
if (p->line == line && (p->c == c || c == -1)) {
r = 0;
edit->force |= REDRAW_LINE;
edit->book_mark = p->prev;
p->prev->next = p->next;
if (p->next)
p->next->prev = p->prev;
g_free (p);
break;
}
}
/* if there is only our dummy book mark left, clear it for speed */
if (edit->book_mark->line == -1 && !edit->book_mark->next) {
g_free (edit->book_mark);
edit->book_mark = 0;
}
return r;
}
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/* clear all bookmarks matching this color, if c is -1 clears all */
void book_mark_flush (WEdit * edit, int c)
{
struct _book_mark *p, *q;
if (!edit->book_mark)
return;
edit->force |= REDRAW_PAGE;
while (edit->book_mark->prev)
edit->book_mark = edit->book_mark->prev;
for (q = edit->book_mark->next; q; q = p) {
p = q->next;
if (q->c == c || c == -1) {
q->prev->next = q->next;
if (p)
p->prev = q->prev;
g_free (q);
}
}
if (!edit->book_mark->next) {
g_free (edit->book_mark);
edit->book_mark = 0;
}
}
/* shift down bookmarks after this line */
void book_mark_inc (WEdit * edit, int line)
{
if (edit->book_mark) {
struct _book_mark *p;
p = book_mark_find (edit, line);
for (p = p->next; p; p = p->next) {
p->line++;
}
}
}
/* shift up bookmarks after this line */
void book_mark_dec (WEdit * edit, int line)
{
if (edit->book_mark) {
struct _book_mark *p;
p = book_mark_find (edit, line);
for (p = p->next; p; p = p->next) {
p->line--;
}
}
}