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mc/edit/edit.c

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/* editor low level data handling and cursor fundamentals.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#define _EDIT_C THIS_IS
#include <config.h>
#if defined(OS2_NT)
# include <io.h>
# include <fcntl.h>
#endif
#include "edit.h"
#ifdef SCO_FLAVOR
# include <sys/timeb.h>
#endif /* SCO_FLAVOR */
#include <time.h> /* for ctime() */
/*
*
* here's a quick sketch of the layout: (don't run this through indent.)
*
* (b1 is buffers1 and b2 is buffers2)
*
* |
* \0\0\0\0\0m e _ f i l e . \nf i n . \n|T h i s _ i s _ s o\0\0\0\0\0\0\0\0\0
* ______________________________________|______________________________________
* |
* ... | b2[2] | b2[1] | b2[0] | b1[0] | b1[1] | b1[2] | ...
* |-> |-> |-> |-> |-> |-> |
* |
* _<------------------------->|<----------------->_
* WEdit->curs2 | WEdit->curs1
* ^ | ^
* | ^|^ |
* cursor ||| cursor
* |||
* file end|||file beginning
* |
* |
*
* _
* This_is_some_file
* fin.
*
*
*/
/*
returns a byte from any location in the file.
Returns '\n' if out of bounds.
*/
int edit_get_byte (WEdit * edit, long byte_index)
{
unsigned long p;
if (byte_index >= (edit->curs1 + edit->curs2) || byte_index < 0)
return '\n';
if (byte_index >= edit->curs1) {
p = edit->curs1 + edit->curs2 - byte_index - 1;
return edit->buffers2[p >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE - (p & M_EDIT_BUF_SIZE) - 1];
} else {
return edit->buffers1[byte_index >> S_EDIT_BUF_SIZE][byte_index & M_EDIT_BUF_SIZE];
}
}
char *edit_get_buffer_as_text (WEdit * e)
{
int l, i;
char *t;
l = e->curs1 + e->curs2;
t = CMalloc (l + 1);
for (i = 0; i < l; i++)
t[i] = edit_get_byte (e, i);
t[l] = 0;
return t;
}
/* Initialisation routines */
/* returns 1 on error */
/* loads file OR text into buffers. Only one must be none-NULL. */
/* cursor set to start of file */
int init_dynamic_edit_buffers (WEdit * edit, const char *filename, const char *text)
{
long buf;
int j, file = 0, buf2;
for (j = 0; j <= MAXBUFF; j++) {
edit->buffers1[j] = NULL;
edit->buffers2[j] = NULL;
}
if (filename)
if ((file = open ((char *) filename, O_RDONLY | MY_O_TEXT)) == -1) {
/* The file-name is printed after the ':' */
edit_error_dialog (_(" Error "), get_sys_error (catstrs (_(" Fail trying to open file for reading: "), filename, " ", 0)));
return 1;
}
edit->curs2 = edit->last_byte;
buf2 = edit->curs2 >> S_EDIT_BUF_SIZE;
edit->buffers2[buf2] = CMalloc (EDIT_BUF_SIZE);
if (filename)
read (file, (char *) edit->buffers2[buf2] + EDIT_BUF_SIZE - (edit->curs2 & M_EDIT_BUF_SIZE), edit->curs2 & M_EDIT_BUF_SIZE);
else {
memcpy (edit->buffers2[buf2] + EDIT_BUF_SIZE - (edit->curs2 & M_EDIT_BUF_SIZE), text, edit->curs2 & M_EDIT_BUF_SIZE);
text += edit->curs2 & M_EDIT_BUF_SIZE;
}
for (buf = buf2 - 1; buf >= 0; buf--) {
edit->buffers2[buf] = CMalloc (EDIT_BUF_SIZE);
if (filename)
read (file, (char *) edit->buffers2[buf], EDIT_BUF_SIZE);
else {
memcpy (edit->buffers2[buf], text, EDIT_BUF_SIZE);
text += EDIT_BUF_SIZE;
}
}
edit->curs1 = 0;
if (filename)
close (file);
return 0;
}
/* returns 1 on error */
int edit_load_file (WEdit * edit, const char *filename, const char *text, unsigned long text_size)
{
struct stat s;
int file;
if (text) {
edit->last_byte = text_size;
filename = NULL;
} else {
#ifdef MIDNIGHT
if ((file = open ((char *) filename, O_RDONLY)) < 0)
{
close(creat((char *) filename, 0666));
if ((file = open ((char *) filename, O_RDONLY)) < 0) {
edit_error_dialog (_(" Error "), get_sys_error (catstrs (" Fail trying to open the file, ", filename, ", for reading ", 0)));
return 1;
}
edit->delete_file = 1;
}
#else
if ((file = open ((char *) filename, O_RDONLY)) < 0) {
edit_error_dialog (_(" Error "), get_sys_error (catstrs (_(" Fail trying to open file for reading: "), filename, " ", 0)));
return 1;
}
#endif
if (stat ((char *) filename, &s) < 0) {
close (file);
/* The file-name is printed after the ':' */
edit_error_dialog (_(" Error "), get_sys_error (catstrs (_(" Cannot get size/permissions info on file: "), filename, " ", 0)));
return 1;
}
if (S_ISDIR (s.st_mode) || S_ISSOCK (s.st_mode)
|| S_ISFIFO (s.st_mode)) {
close (file);
/* The file-name is printed after the ':' */
edit_error_dialog (_(" Error "), catstrs (_(" Not an ordinary file: "), filename, " ", 0));
return 1;
}
if (s.st_size >= SIZE_LIMIT) {
close (file);
/* The file-name is printed after the ':' */
edit_error_dialog (_(" Error "), catstrs (_(" File is too large: "), \
filename, _(" \n Increase edit.h:MAXBUF and recompile the editor. "), 0));
return 1;
}
close (file);
edit->last_byte = s.st_size;
edit->stat = s;
}
return init_dynamic_edit_buffers (edit, filename, text);
}
#ifdef MIDNIGHT
#define space_width 1
#else
int space_width;
extern int option_long_whitespace;
extern unsigned char per_char[256];
void edit_set_space_width (int s)
{
space_width = s;
}
#endif
/* fills in the edit struct. returns 0 on fail. Pass edit as NULL for this function to do an malloc for you */
WEdit *edit_init (WEdit * edit, int lines, int columns, const char *filename, const char *text, const char *dir, unsigned long text_size)
{
char *f;
#ifndef MIDNIGHT
if (option_long_whitespace)
edit_set_space_width (per_char[' '] * 2);
else
edit_set_space_width (per_char[' ']);
#endif
if (!edit)
edit = malloc (sizeof (WEdit));
if (!edit) {
edit_error_dialog (_(" Error "), _(" Error allocating memory "));
return 0;
}
memset (&(edit->from_here), 0, (unsigned long) &(edit->to_here) - (unsigned long) &(edit->from_here));
#ifndef MIDNIGHT
edit->max_column = columns * FONT_MEAN_WIDTH;
#endif
edit->num_widget_lines = lines;
edit->num_widget_columns = columns;
edit->stat.st_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
edit->stat.st_uid = getuid ();
edit->stat.st_gid = getgid ();
edit->bracket = -1;
if (!dir)
dir = "";
f = (char *) filename;
if (filename)
f = catstrs (dir, filename, 0);
if (edit_load_file (edit, f, text, text_size)) {
/* edit_load_file already gives an error message */
free (edit);
return 0;
}
edit->force |= REDRAW_PAGE;
if (filename) {
filename = catstrs (dir, filename, 0);
edit_split_filename (edit, (char *) filename);
} else {
edit->filename = strdup ("");
edit->dir = strdup(dir);
}
edit->stack_size = START_STACK_SIZE;
edit->stack_size_mask = START_STACK_SIZE - 1;
edit->undo_stack = malloc ((edit->stack_size + 10) * sizeof (long));
if (!edit->undo_stack) {
edit_error_dialog (_(" Error "), _(" Error allocating memory "));
free (edit);
return 0;
}
edit->total_lines = edit_count_lines (edit, 0, edit->last_byte);
edit_load_syntax (edit, 0, 0);
{
int fg, bg;
edit_get_syntax_color (edit, -1, &fg, &bg);
}
return edit;
}
/* clear the edit struct, freeing everything in it. returns 1 on success */
int edit_clean (WEdit * edit)
{
if (edit) {
int j = 0;
edit_free_syntax_rules (edit);
for (; j <= MAXBUFF; j++) {
if (edit->buffers1[j] != NULL)
free (edit->buffers1[j]);
if (edit->buffers2[j] != NULL)
free (edit->buffers2[j]);
}
if (edit->undo_stack)
free (edit->undo_stack);
if (edit->filename)
free (edit->filename);
if (edit->dir)
free (edit->dir);
/* we don't want to clear the widget */
memset (&(edit->from_here), 0, (unsigned long) &(edit->to_here) - (unsigned long) &(edit->from_here));
return 1;
}
return 0;
}
/* returns 1 on success */
int edit_renew (WEdit * edit)
{
int lines = edit->num_widget_lines;
int columns = edit->num_widget_columns;
char *dir;
if (edit->dir)
dir = strdup (edit->dir);
else
dir = 0;
edit_clean (edit);
if (!edit_init (edit, lines, columns, 0, "", dir, 0))
return 0;
return 1;
}
/* returns 1 on success */
int edit_reload (WEdit * edit, const char *filename, const char *text, const char *dir, unsigned long text_size)
{
int lines = edit->num_widget_lines;
int columns = edit->num_widget_columns;
edit_clean (edit);
if (!edit_init (edit, lines, columns, filename, text, dir, text_size)) {
return 0;
}
return 1;
}
/*
Recording stack for undo:
The following is an implementation of a compressed stack. Identical
pushes are recorded by a negative prefix indicating the number of times the
same char was pushed. This saves space for repeated curs-left or curs-right
delete etc.
eg:
pushed: stored:
a
b a
b -3
b b
c --> -4
c c
c d
c
d
If the stack long int is 0-255 it represents a normal insert (from a backspace),
256-512 is an insert ahead (from a delete), If it is betwen 600 and 700 it is one
of the cursor functions #define'd in edit.h. 1000 through 700'000'000 is to
set edit->mark1 position. 700'000'000 through 1400'000'000 is to set edit->mark2
position.
The only way the curser moves or the buffer is changed is through the routines:
insert, backspace, insert_ahead, delete, and cursor_move.
These record the reverse undo movements onto the stack each time they are
called.
Each key press results in a set of actions (insert; delete ...). So each time
a key is pressed the current position of start_display is pushed as
KEY_PRESS + start_display. Then for undoing, we pop until we get to a number
over KEY_PRESS. We then assign this number less KEY_PRESS to start_display. So undo
tracks scrolling and key actions exactly. (KEY_PRESS is about (2^31) * (2/3) = 1400'000'000)
*/
static int push_action_disabled = 0;
void edit_push_action (WEdit * edit, long c,...)
{
unsigned long sp = edit->stack_pointer;
unsigned long spm1;
long *t;
/* first enlarge the stack if necessary */
if (sp > edit->stack_size - 10) { /* say */
if (option_max_undo < 256)
option_max_undo = 256;
if (edit->stack_size < option_max_undo) {
t = malloc ((edit->stack_size * 2 + 10) * sizeof (long));
if (t) {
memcpy (t, edit->undo_stack, sizeof (long) * edit->stack_size);
free (edit->undo_stack);
edit->undo_stack = t;
edit->stack_size <<= 1;
edit->stack_size_mask = edit->stack_size - 1;
}
}
}
spm1 = (edit->stack_pointer - 1) & edit->stack_size_mask;
if (push_action_disabled)
return;
#ifdef FAST_MOVE_CURSOR
if (c == CURS_LEFT_LOTS || c == CURS_RIGHT_LOTS) {
va_list ap;
edit->undo_stack[sp] = c == CURS_LEFT_LOTS ? CURS_LEFT : CURS_RIGHT;
edit->stack_pointer = (edit->stack_pointer + 1) & edit->stack_size_mask;
va_start (ap, c);
c = -(va_arg (ap, int));
va_end (ap);
} else
#endif /* ! FAST_MOVE_CURSOR */
if (spm1 != edit->stack_bottom && ((sp - 2) & edit->stack_size_mask) != edit->stack_bottom) {
int d;
if (edit->undo_stack[spm1] < 0) {
d = edit->undo_stack[(sp - 2) & edit->stack_size_mask];
if (d == c) {
if (edit->undo_stack[spm1] > -1000000000) {
if (c < KEY_PRESS) /* --> no need to push multiple do-nothings */
edit->undo_stack[spm1]--;
return;
}
}
/* #define NO_STACK_CURSMOVE_ANIHILATION */
#ifndef NO_STACK_CURSMOVE_ANIHILATION
else if ((c == CURS_LEFT && d == CURS_RIGHT)
|| (c == CURS_RIGHT && d == CURS_LEFT)) { /* a left then a right anihilate each other */
if (edit->undo_stack[spm1] == -2)
edit->stack_pointer = spm1;
else
edit->undo_stack[spm1]++;
return;
}
#endif
} else {
d = edit->undo_stack[spm1];
if (d == c) {
if (c >= KEY_PRESS)
return; /* --> no need to push multiple do-nothings */
edit->undo_stack[sp] = -2;
goto check_bottom;
}
#ifndef NO_STACK_CURSMOVE_ANIHILATION
else if ((c == CURS_LEFT && d == CURS_RIGHT)
|| (c == CURS_RIGHT && d == CURS_LEFT)) { /* a left then a right anihilate each other */
edit->stack_pointer = spm1;
return;
}
#endif
}
}
edit->undo_stack[sp] = c;
check_bottom:
edit->stack_pointer = (edit->stack_pointer + 1) & edit->stack_size_mask;
/*if the sp wraps round and catches the stack_bottom then erase the first set of actions on the stack to make space - by moving stack_bottom forward one "key press" */
c = (edit->stack_pointer + 2) & edit->stack_size_mask;
if (c == edit->stack_bottom || ((c + 1) & edit->stack_size_mask) == edit->stack_bottom)
do {
edit->stack_bottom = (edit->stack_bottom + 1) & edit->stack_size_mask;
} while (edit->undo_stack[edit->stack_bottom] < KEY_PRESS && edit->stack_bottom != edit->stack_pointer);
/*If a single key produced enough pushes to wrap all the way round then we would notice that the [stack_bottom] does not contain KEY_PRESS. The stack is then initialised: */
if (edit->stack_pointer != edit->stack_bottom && edit->undo_stack[edit->stack_bottom] < KEY_PRESS)
edit->stack_bottom = edit->stack_pointer = 0;
}
/*
TODO: if the user undos until the stack bottom, and the stack has not wrapped,
then the file should be as it was when he loaded up. Then set edit->modified to 0.
*/
long pop_action (WEdit * edit)
{
long c;
unsigned long sp = edit->stack_pointer;
if (sp == edit->stack_bottom) {
return STACK_BOTTOM;
}
sp = (sp - 1) & edit->stack_size_mask;
if ((c = edit->undo_stack[sp]) >= 0) {
/* edit->undo_stack[sp] = '@'; */
edit->stack_pointer = (edit->stack_pointer - 1) & edit->stack_size_mask;
return c;
}
if (sp == edit->stack_bottom) {
return STACK_BOTTOM;
}
c = edit->undo_stack[(sp - 1) & edit->stack_size_mask];
if (edit->undo_stack[sp] == -2) {
/* edit->undo_stack[sp] = '@'; */
edit->stack_pointer = sp;
} else
edit->undo_stack[sp]++;
return c;
}
/* is called whenever a modification is made by one of the four routines below */
static inline void edit_modification (WEdit * edit)
{
edit->modified = 1;
}
/*
Basic low level single character buffer alterations and movements at the cursor.
Returns char passed over, inserted or removed.
*/
void edit_insert (WEdit * edit, int c)
{
/* check if file has grown to large */
if (edit->last_byte >= SIZE_LIMIT)
return;
/* first we must update the position of the display window */
if (edit->curs1 < edit->start_display) {
edit->start_display++;
if (c == '\n')
edit->start_line++;
}
/* now we must update some info on the file and check if a redraw is required */
if (c == '\n') {
edit->curs_line++;
edit->total_lines++;
edit->force |= REDRAW_LINE_ABOVE | REDRAW_AFTER_CURSOR;
}
/* tell that we've modified the file */
edit_modification (edit);
/* save the reverse command onto the undo stack */
edit_push_action (edit, BACKSPACE);
/* update markers */
edit->mark1 += (edit->mark1 > edit->curs1);
edit->mark2 += (edit->mark2 > edit->curs1);
edit->last_get_rule += (edit->last_get_rule > edit->curs1);
/* add a new buffer if we've reached the end of the last one */
if (!(edit->curs1 & M_EDIT_BUF_SIZE))
edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = malloc (EDIT_BUF_SIZE);
/* perfprm the insertion */
edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE][edit->curs1 & M_EDIT_BUF_SIZE] = (unsigned char) c;
/* update file length */
edit->last_byte++;
/* update cursor position */
edit->curs1++;
}
/* same as edit_insert and move left */
void edit_insert_ahead (WEdit * edit, int c)
{
if (edit->last_byte >= SIZE_LIMIT)
return;
if (edit->curs1 < edit->start_display) {
edit->start_display++;
if (c == '\n')
edit->start_line++;
}
if (c == '\n') {
edit->total_lines++;
edit->force |= REDRAW_AFTER_CURSOR;
}
edit_modification (edit);
edit_push_action (edit, DELETE);
edit->mark1 += (edit->mark1 >= edit->curs1);
edit->mark2 += (edit->mark2 >= edit->curs1);
edit->last_get_rule += (edit->last_get_rule >= edit->curs1);
if (!((edit->curs2 + 1) & M_EDIT_BUF_SIZE))
edit->buffers2[(edit->curs2 + 1) >> S_EDIT_BUF_SIZE] = malloc (EDIT_BUF_SIZE);
edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE - (edit->curs2 & M_EDIT_BUF_SIZE) - 1] = c;
edit->last_byte++;
edit->curs2++;
}
int edit_delete (WEdit * edit)
{
int p;
if (!edit->curs2)
return 0;
edit->mark1 -= (edit->mark1 > edit->curs1);
edit->mark2 -= (edit->mark2 > edit->curs1);
edit->last_get_rule -= (edit->last_get_rule > edit->curs1);
p = edit->buffers2[(edit->curs2 - 1) >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE - ((edit->curs2 - 1) & M_EDIT_BUF_SIZE) - 1];
if (!(edit->curs2 & M_EDIT_BUF_SIZE)) {
free (edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE]);
edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = NULL;
}
edit->last_byte--;
edit->curs2--;
if (p == '\n') {
edit->total_lines--;
edit->force |= REDRAW_AFTER_CURSOR;
}
edit_push_action (edit, p + 256);
if (edit->curs1 < edit->start_display) {
edit->start_display--;
if (p == '\n')
edit->start_line--;
}
edit_modification (edit);
return p;
}
int edit_backspace (WEdit * edit)
{
int p;
if (!edit->curs1)
return 0;
edit->mark1 -= (edit->mark1 >= edit->curs1);
edit->mark2 -= (edit->mark2 >= edit->curs1);
edit->last_get_rule -= (edit->last_get_rule >= edit->curs1);
p = *(edit->buffers1[(edit->curs1 - 1) >> S_EDIT_BUF_SIZE] + ((edit->curs1 - 1) & M_EDIT_BUF_SIZE));
if (!((edit->curs1 - 1) & M_EDIT_BUF_SIZE)) {
free (edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE]);
edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = NULL;
}
edit->last_byte--;
edit->curs1--;
if (p == '\n') {
edit->curs_line--;
edit->total_lines--;
edit->force |= REDRAW_AFTER_CURSOR;
}
edit_push_action (edit, p);
if (edit->curs1 < edit->start_display) {
edit->start_display--;
if (p == '\n')
edit->start_line--;
}
edit_modification (edit);
return p;
}
#ifdef FAST_MOVE_CURSOR
#define memqcpy(edit,d,s,i) \
{ \
unsigned long next; \
char *dest = d; \
char *src = s; \
int n = i; \
while ((next = \
(unsigned long) memccpy (dest, src, '\n', n))) { \
edit->curs_line--; \
next -= (unsigned long) dest; \
n -= next; \
src += next; \
dest += next; \
} \
}
int edit_move_backward_lots (WEdit * edit, long increment)
{
int r, s, t;
char *p;
if (increment > edit->curs1)
increment = edit->curs1;
if (increment <= 0)
return -1;
edit_push_action (edit, CURS_RIGHT_LOTS, increment);
t = r = EDIT_BUF_SIZE - (edit->curs2 & M_EDIT_BUF_SIZE);
if (r > increment)
r = increment;
s = edit->curs1 & M_EDIT_BUF_SIZE;
p = 0;
if (s > r) {
memqcpy (edit, edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] + t - r,
edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] + s - r, r);
} else {
if (s) {
memqcpy (edit, edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] + t - s,
edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE], s);
p = edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE];
edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = 0;
}
memqcpy (edit, edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] + t - r,
edit->buffers1[(edit->curs1 >> S_EDIT_BUF_SIZE) - 1] + EDIT_BUF_SIZE - (r - s), r - s);
}
increment -= r;
edit->curs1 -= r;
edit->curs2 += r;
if (!(edit->curs2 & M_EDIT_BUF_SIZE)) {
if (p)
edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = p;
else
edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = malloc (EDIT_BUF_SIZE);
} else {
if (p)
free (p);
}
s = edit->curs1 & M_EDIT_BUF_SIZE;
while (increment) {
p = 0;
r = EDIT_BUF_SIZE;
if (r > increment)
r = increment;
t = s;
if (r < t)
t = r;
memqcpy (edit,
edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] + EDIT_BUF_SIZE - t,
edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] + s - t,
t);
if (r >= s) {
if (t) {
p = edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE];
edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = 0;
}
memqcpy (edit,
edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] + EDIT_BUF_SIZE - r,
edit->buffers1[(edit->curs1 >> S_EDIT_BUF_SIZE) - 1] + EDIT_BUF_SIZE - (r - s),
r - s);
}
increment -= r;
edit->curs1 -= r;
edit->curs2 += r;
if (!(edit->curs2 & M_EDIT_BUF_SIZE)) {
if (p)
edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = p;
else
edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = malloc (EDIT_BUF_SIZE);
} else {
if (p)
free (p);
}
}
return edit_get_byte (edit, edit->curs1);
}
#endif /* ! FAST_MOVE_CURSOR */
/* moves the curser right or left: increment positive or negative respectively */
int edit_cursor_move (WEdit * edit, long increment)
{
/* this is the same as a combination of two of the above routines, with only one push onto the undo stack */
int c;
#ifdef FAST_MOVE_CURSOR
if (increment < -256) {
edit->force |= REDRAW_PAGE;
return edit_move_backward_lots (edit, -increment);
}
#endif /* ! FAST_MOVE_CURSOR */
if (increment < 0) {
for (; increment < 0; increment++) {
if (!edit->curs1)
return -1;
edit_push_action (edit, CURS_RIGHT);
c = edit_get_byte (edit, edit->curs1 - 1);
if (!((edit->curs2 + 1) & M_EDIT_BUF_SIZE))
edit->buffers2[(edit->curs2 + 1) >> S_EDIT_BUF_SIZE] = malloc (EDIT_BUF_SIZE);
edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE - (edit->curs2 & M_EDIT_BUF_SIZE) - 1] = c;
edit->curs2++;
c = edit->buffers1[(edit->curs1 - 1) >> S_EDIT_BUF_SIZE][(edit->curs1 - 1) & M_EDIT_BUF_SIZE];
if (!((edit->curs1 - 1) & M_EDIT_BUF_SIZE)) {
free (edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE]);
edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = NULL;
}
edit->curs1--;
if (c == '\n') {
edit->curs_line--;
edit->force |= REDRAW_LINE_BELOW;
}
}
return c;
} else if (increment > 0) {
for (; increment > 0; increment--) {
if (!edit->curs2)
return -2;
edit_push_action (edit, CURS_LEFT);
c = edit_get_byte (edit, edit->curs1);
if (!(edit->curs1 & M_EDIT_BUF_SIZE))
edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = malloc (EDIT_BUF_SIZE);
edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE][edit->curs1 & M_EDIT_BUF_SIZE] = c;
edit->curs1++;
c = edit->buffers2[(edit->curs2 - 1) >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE - ((edit->curs2 - 1) & M_EDIT_BUF_SIZE) - 1];
if (!(edit->curs2 & M_EDIT_BUF_SIZE)) {
free (edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE]);
edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = 0;
}
edit->curs2--;
if (c == '\n') {
edit->curs_line++;
edit->force |= REDRAW_LINE_ABOVE;
}
}
return c;
} else
return -3;
}
/* These functions return positions relative to lines */
/* returns index of last char on line + 1 */
long edit_eol (WEdit * edit, long current)
{
if (current < edit->last_byte) {
for (;; current++)
#if 0
if (current == edit->last_byte || edit_get_byte (edit, current) == '\n')
#else
if (edit_get_byte (edit, current) == '\n')
#endif
break;
} else
return edit->last_byte;
return current;
}
/* returns index of first char on line */
long edit_bol (WEdit * edit, long current)
{
if (current > 0) {
for (;; current--)
#if 0
if (current == 0 || edit_get_byte (edit, current - 1) == '\n')
#else
if (edit_get_byte (edit, current - 1) == '\n')
#endif
break;
} else
return 0;
return current;
}
int edit_count_lines (WEdit * edit, long current, int upto)
{
int lines = 0;
if (upto > edit->last_byte)
upto = edit->last_byte;
if (current < 0)
current = 0;
while (current < upto)
if (edit_get_byte (edit, current++) == '\n')
lines++;
return lines;
}
/* If lines is zero this returns the count of lines from current to upto. */
/* If upto is zero returns index of lines forward current. */
long edit_move_forward (WEdit * edit, long current, int lines, long upto)
{
if (upto) {
return edit_count_lines (edit, current, upto);
} else {
int next;
if (lines < 0)
lines = 0;
while (lines--) {
next = edit_eol (edit, current) + 1;
if (next > edit->last_byte)
break;
else
current = next;
}
return current;
}
}
/* Returns offset of 'lines' lines up from current */
long edit_move_backward (WEdit * edit, long current, int lines)
{
if (lines < 0)
lines = 0;
current = edit_bol (edit, current);
while((lines--) && current != 0)
current = edit_bol (edit, current - 1);
return current;
}
#ifdef MIDNIGHT
/* If cols is zero this returns the count of columns from current to upto. */
/* If upto is zero returns index of cols across from current. */
long edit_move_forward3 (WEdit * edit, long current, int cols, long upto)
{
long p, q;
int col = 0;
if (upto) {
q = upto;
cols = -10;
} else
q = edit->last_byte + 2;
for (col = 0, p = current; p < q; p++) {
int c;
if (cols != -10) {
if (col == cols)
return p;
if (col > cols)
return p - 1;
}
c = edit_get_byte (edit, p);
if (c == '\r')
continue;
else
if (c == '\t')
col += TAB_SIZE - col % TAB_SIZE;
else
col++;
/*if(edit->nroff ... */
if (c == '\n') {
if (upto)
return col;
else
return p;
}
}
return (float) col;
}
#endif
/* returns the current column position of the cursor */
int edit_get_col (WEdit * edit)
{
return edit_move_forward3 (edit, edit_bol (edit, edit->curs1), 0, edit->curs1);
}
/* Scrolling functions */
void edit_update_curs_row (WEdit * edit)
{
edit->curs_row = edit->curs_line - edit->start_line;
}
void edit_update_curs_col (WEdit * edit)
{
edit->curs_col = edit_move_forward3(edit, edit_bol(edit, edit->curs1), 0, edit->curs1);
}
/*moves the display start position up by i lines */
void edit_scroll_upward (WEdit * edit, unsigned long i)
{
int lines_above = edit->start_line;
if (i > lines_above)
i = lines_above;
if (i) {
edit->start_line -= i;
edit->start_display = edit_move_backward (edit, edit->start_display, i);
edit->force |= REDRAW_PAGE;
edit->force &= (0xfff - REDRAW_CHAR_ONLY);
}
edit_update_curs_row(edit);
}
/* returns 1 if could scroll, 0 otherwise */
void edit_scroll_downward (WEdit * edit, int i)
{
int lines_below;
lines_below = edit->total_lines - edit->start_line - (edit->num_widget_lines - 1);
if (lines_below > 0) {
if (i > lines_below)
i = lines_below;
edit->start_line += i;
edit->start_display = edit_move_forward (edit, edit->start_display, i, 0);
edit->force |= REDRAW_PAGE;
edit->force &= (0xfff - REDRAW_CHAR_ONLY);
}
edit_update_curs_row(edit);
}
void edit_scroll_right (WEdit * edit, int i)
{
edit->force |= REDRAW_PAGE;
edit->force &= (0xfff - REDRAW_CHAR_ONLY);
edit->start_col -= i;
}
void edit_scroll_left (WEdit * edit, int i)
{
if (edit->start_col) {
edit->start_col += i;
if (edit->start_col > 0)
edit->start_col = 0;
edit->force |= REDRAW_PAGE;
edit->force &= (0xfff - REDRAW_CHAR_ONLY);
}
}
/* high level cursor movement commands */
static int is_in_indent (WEdit *edit)
{
long p = edit_bol (edit, edit->curs1);
while (p < edit->curs1)
if (!strchr (" \t", edit_get_byte (edit, p++)))
return 0;
return 1;
}
static int left_of_four_spaces (WEdit *edit);
static void edit_move_to_prev_col (WEdit * edit, long p)
{
edit_cursor_move (edit, edit_move_forward3 (edit, p, edit->prev_col, 0) - edit->curs1);
if (is_in_indent (edit) && option_fake_half_tabs) {
edit_update_curs_col (edit);
if (edit->curs_col % (HALF_TAB_SIZE * space_width)) {
int q = edit->curs_col;
edit->curs_col -= (edit->curs_col % (HALF_TAB_SIZE * space_width));
p = edit_bol (edit, edit->curs1);
edit_cursor_move (edit, edit_move_forward3 (edit, p, edit->curs_col, 0) - edit->curs1);
if (!left_of_four_spaces (edit))
edit_cursor_move (edit, edit_move_forward3 (edit, p, q, 0) - edit->curs1);
}
}
}
/* move i lines */
static void edit_move_up (WEdit * edit, unsigned long i, int scroll)
{
long p, l = edit->curs_line;
if (i > l)
i = l;
if (i) {
if (i > 1)
edit->force |= REDRAW_PAGE;
if (scroll)
edit_scroll_upward (edit, i);
p = edit_bol (edit, edit->curs1);
edit_cursor_move (edit, (p = edit_move_backward (edit, p, i)) - edit->curs1);
edit_move_to_prev_col (edit, p);
edit->search_start = edit->curs1;
edit->found_len = 0;
}
}
int is_blank (WEdit * edit, long offset)
{
long s, f;
int c;
s = edit_bol (edit, offset);
f = edit_eol (edit, offset) - 1;
while (s <= f) {
c = edit_get_byte (edit, s++);
if ((c > ' ' && c <= '~') || c >= 160) /* non-printables on a line are considered "blank" */
return 0;
}
return 1;
}
int line_is_blank (WEdit * edit, long line)
{
static long p = -1, l = 0;
if (p == -1 || abs (l - line) > abs (edit->curs_line - line)) {
l = edit->curs_line;
p = edit->curs1;
}
if (line < l)
p = edit_move_backward (edit, p, l - line);
else if (line > l)
p = edit_move_forward (edit, p, line - l, 0);
l = line;
return is_blank (edit, p);
}
/* moves up until a blank line is reached, or until just
before a non-blank line is reached */
static void edit_move_up_paragraph (WEdit * edit, int scroll)
{
int i;
if (edit->curs_line <= 1) {
i = 0;
} else {
if (line_is_blank (edit, edit->curs_line)) {
if (line_is_blank (edit, edit->curs_line - 1)) {
for (i = edit->curs_line - 1; i; i--)
if (!line_is_blank (edit, i)) {
i++;
break;
}
} else {
for (i = edit->curs_line - 1; i; i--)
if (line_is_blank (edit, i))
break;
}
} else {
for (i = edit->curs_line - 1; i; i--)
if (line_is_blank (edit, i))
break;
}
}
edit_move_up (edit, edit->curs_line - i, scroll);
}
/* move i lines */
static void edit_move_down (WEdit * edit, int i, int scroll)
{
long p, l = edit->total_lines - edit->curs_line;
if (i > l)
i = l;
if (i) {
if (i > 1)
edit->force |= REDRAW_PAGE;
if (scroll)
edit_scroll_downward (edit, i);
p = edit_bol (edit, edit->curs1);
edit_cursor_move (edit, (p = edit_move_forward (edit, p, i, 0)) - edit->curs1);
edit_move_to_prev_col (edit, p);
edit->search_start = edit->curs1;
edit->found_len = 0;
}
}
/* moves down until a blank line is reached, or until just
before a non-blank line is reached */
static void edit_move_down_paragraph (WEdit * edit, int scroll)
{
int i;
if (edit->curs_line >= edit->total_lines - 1) {
i = edit->total_lines;
} else {
if (line_is_blank (edit, edit->curs_line)) {
if (line_is_blank (edit, edit->curs_line + 1)) {
for (i = edit->curs_line + 1; i; i++)
if (!line_is_blank (edit, i) || i > edit->total_lines) {
i--;
break;
}
} else {
for (i = edit->curs_line + 1; i; i++)
if (line_is_blank (edit, i) || i >= edit->total_lines)
break;
}
} else {
for (i = edit->curs_line + 1; i; i++)
if (line_is_blank (edit, i) || i >= edit->total_lines)
break;
}
}
edit_move_down (edit, i - edit->curs_line, scroll);
}
static void edit_begin_page (WEdit *edit)
{
edit_update_curs_row (edit);
edit_move_up (edit, edit->curs_row, 0);
}
static void edit_end_page (WEdit *edit)
{
edit_update_curs_row (edit);
edit_move_down (edit, edit->num_widget_lines - edit->curs_row - 1, 0);
}
/* goto beginning of text */
static void edit_move_to_top (WEdit * edit)
{
if (edit->curs_line) {
edit_cursor_move (edit, -edit->curs1);
edit_move_to_prev_col (edit, 0);
edit->force |= REDRAW_PAGE;
edit->search_start = 0;
edit_update_curs_row(edit);
}
}
/* goto end of text */
static void edit_move_to_bottom (WEdit * edit)
{
if (edit->curs_line < edit->total_lines) {
edit_cursor_move (edit, edit->curs2);
edit->start_display = edit->last_byte;
edit->start_line = edit->total_lines;
edit_update_curs_row(edit);
edit_scroll_upward (edit, edit->num_widget_lines - 1);
edit->force |= REDRAW_PAGE;
}
}
/* goto beginning of line */
static void edit_cursor_to_bol (WEdit * edit)
{
edit_cursor_move (edit, edit_bol (edit, edit->curs1) - edit->curs1);
edit->search_start = edit->curs1;
edit->prev_col = edit_get_col (edit);
}
/* goto end of line */
static void edit_cursor_to_eol (WEdit * edit)
{
edit_cursor_move (edit, edit_eol (edit, edit->curs1) - edit->curs1);
edit->search_start = edit->curs1;
edit->prev_col = edit_get_col (edit);
}
/* move cursor to line 'line' */
void edit_move_to_line (WEdit * e, long line)
{
if(line < e->curs_line)
edit_move_up (e, e->curs_line - line, 0);
else
edit_move_down (e, line - e->curs_line, 0);
edit_scroll_screen_over_cursor (e);
}
/* scroll window so that first visible line is 'line' */
void edit_move_display (WEdit * e, long line)
{
if(line < e->start_line)
edit_scroll_upward (e, e->start_line - line);
else
edit_scroll_downward (e, line - e->start_line);
}
/* save markers onto undo stack */
void edit_push_markers (WEdit * edit)
{
edit_push_action (edit, MARK_1 + edit->mark1);
edit_push_action (edit, MARK_2 + edit->mark2);
}
void free_selections (void)
{
int i;
for (i = 0; i < NUM_SELECTION_HISTORY; i++)
if (selection_history[i].text) {
free (selection_history[i].text);
selection_history[i].text = 0;
selection_history[i].len = 0;
}
current_selection = 0;
}
/* return -1 on nothing to store or error, zero otherwise */
void edit_get_selection (WEdit * edit)
{
long start_mark, end_mark;
if (eval_marks (edit, &start_mark, &end_mark))
return;
if (selection_history[current_selection].len < 4096) /* large selections should not be held -- to save memory */
current_selection = (current_selection + 1) % NUM_SELECTION_HISTORY;
selection_history[current_selection].len = end_mark - start_mark;
if (selection_history[current_selection].text)
free (selection_history[current_selection].text);
selection_history[current_selection].text = malloc (selection_history[current_selection].len + 1);
if (!selection_history[current_selection].text) {
selection_history[current_selection].text = malloc (1);
*selection_history[current_selection].text = 0;
selection_history[current_selection].len = 0;
} else {
unsigned char *p = selection_history[current_selection].text;
for (; start_mark < end_mark; start_mark++)
*p++ = edit_get_byte (edit, start_mark);
*p = 0;
}
selection.text = selection_history[current_selection].text;
selection.len = selection_history[current_selection].len;
}
void edit_set_markers (WEdit * edit, long m1, long m2, int c1, int c2)
{
edit->mark1 = m1;
edit->mark2 = m2;
edit->column1 = c1;
edit->column2 = c2;
}
/* highlight marker toggle */
void edit_mark_cmd (WEdit * edit, int unmark)
{
edit_push_markers (edit);
if (unmark) {
edit_set_markers (edit, 0, 0, 0, 0);
edit->force |= REDRAW_PAGE;
} else {
if (edit->mark2 >= 0) {
edit_set_markers (edit, edit->curs1, -1, edit->curs_col, edit->curs_col);
edit->force |= REDRAW_PAGE;
} else
edit_set_markers (edit, edit->mark1, edit->curs1, edit->column1, edit->curs_col);
}
}
int my_type_of (int c)
{
if (c < ' ' && c > 0)
return 1;
if (strchr ("+_-.", c))
if (strchr (option_whole_chars_move, c))
return 3;
if (!strcasechr (option_whole_chars_move, c))
return 2;
if ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c >= 160)
return 3;
return c;
}
void edit_left_word_move (WEdit * edit)
{
do {
edit_cursor_move (edit, -1);
if (!edit->curs1)
break;
} while (my_type_of (edit_get_byte (edit, edit->curs1))
==
my_type_of (edit_get_byte (edit, edit->curs1 - 1)));
}
static void edit_left_word_move_cmd (WEdit * edit)
{
edit_left_word_move (edit);
if (strchr (option_whole_chars_move, ' '))
if (strchr ("\t ", edit_get_byte (edit, edit->curs1)))
edit_left_word_move (edit);
edit->force |= REDRAW_PAGE;
}
void edit_right_word_move (WEdit * edit)
{
do {
edit_cursor_move (edit, 1);
if (edit->curs1 >= edit->last_byte)
break;
} while (my_type_of (edit_get_byte (edit, edit->curs1 - 1))
==
my_type_of (edit_get_byte (edit, edit->curs1)));
}
static void edit_right_word_move_cmd (WEdit * edit)
{
edit_right_word_move (edit);
if (strchr (option_whole_chars_move, ' '))
if (strchr ("\t ", edit_get_byte (edit, edit->curs1)))
edit_right_word_move (edit);
edit->force |= REDRAW_PAGE;
}
static void edit_right_delete_word (WEdit * edit)
{
int c;
do {
c = edit_delete (edit);
} while (my_type_of (c) == my_type_of (edit_get_byte (edit, edit->curs1)));
}
static void edit_left_delete_word (WEdit * edit)
{
int c;
do {
c = edit_backspace (edit);
} while (my_type_of (c) == my_type_of (edit_get_byte (edit, edit->curs1 - 1)));
}
/*
the start column position is not recorded, and hence does not
undo as it happed. But who would notice.
*/
void edit_do_undo (WEdit * edit)
{
long ac;
long count = 0;
push_action_disabled = 1; /* don't record undo's onto undo stack! */
while ((ac = pop_action (edit)) < KEY_PRESS) {
switch ((int) ac) {
case STACK_BOTTOM:
goto done_undo;
case CURS_RIGHT:
edit_cursor_move (edit, 1);
break;
case CURS_LEFT:
edit_cursor_move (edit, -1);
break;
case BACKSPACE:
edit_backspace (edit);
break;
case DELETE:
edit_delete (edit);
break;
}
if (ac >= 256 && ac < 512)
edit_insert_ahead (edit, ac - 256);
if (ac >= 0 && ac < 256)
edit_insert (edit, ac);
if (ac >= MARK_1 - 2 && ac < MARK_2 - 2) {
edit->mark1 = ac - MARK_1;
} else if (ac >= MARK_2 - 2 && ac < KEY_PRESS) {
edit->mark2 = ac - MARK_2;
}
if (count++)
edit->force |= REDRAW_PAGE; /* more than one pop usually means something big */
}
if (edit->start_display > ac - KEY_PRESS) {
edit->start_line -= edit_count_lines (edit, ac - KEY_PRESS, edit->start_display);
edit->force |= REDRAW_PAGE;
} else if (edit->start_display < ac - KEY_PRESS) {
edit->start_line += edit_count_lines (edit, edit->start_display, ac - KEY_PRESS);
edit->force |= REDRAW_PAGE;
}
edit->start_display = ac - KEY_PRESS; /* see push and pop above */
edit_update_curs_row(edit);
done_undo:;
push_action_disabled = 0;
}
static void edit_delete_to_line_end (WEdit * edit)
{
for (;;) {
if (edit_get_byte (edit, edit->curs1) == '\n')
break;
if (!edit->curs2)
break;
edit_delete (edit);
}
}
static void edit_delete_to_line_begin (WEdit * edit)
{
for (;;) {
if (edit_get_byte (edit, edit->curs1 - 1) == '\n')
break;
if (!edit->curs1)
break;
edit_backspace (edit);
}
}
static void edit_delete_line (WEdit * edit)
{
int c;
do {
c = edit_delete (edit);
} while (c != '\n' && c);
do {
c = edit_backspace (edit);
} while (c != '\n' && c);
if (c)
edit_insert (edit, '\n');
}
static void insert_spaces_tab (WEdit * edit)
{
int i = option_tab_spacing;
while (i--)
edit_insert (edit, ' ');
}
static int is_aligned_on_a_tab (WEdit * edit)
{
edit_update_curs_col (edit);
if ((edit->curs_col % (TAB_SIZE * space_width)) && edit->curs_col % (TAB_SIZE * space_width) != (HALF_TAB_SIZE * space_width))
return 0; /* not alligned on a tab */
return 1;
}
static int right_of_four_spaces (WEdit *edit)
{
int i, ch = 0;
for (i = 1; i <= HALF_TAB_SIZE; i++)
ch |= edit_get_byte (edit, edit->curs1 - i);
if (ch == ' ')
return is_aligned_on_a_tab (edit);
return 0;
}
static int left_of_four_spaces (WEdit *edit)
{
int i, ch = 0;
for (i = 0; i < HALF_TAB_SIZE; i++)
ch |= edit_get_byte (edit, edit->curs1 + i);
if (ch == ' ')
return is_aligned_on_a_tab (edit);
return 0;
}
int edit_indent_width (WEdit * edit, long p)
{
long q = p;
while (strchr ("\t ", edit_get_byte (edit, q)) && q < edit->last_byte - 1) /* move to the end of the leading whitespace of the line */
q++;
return edit_move_forward3 (edit, p, 0, q); /* count the number of columns of indentation */
}
void edit_insert_indent (WEdit * edit, int indent)
{
#ifndef MIDNIGHT
indent /= space_width;
#endif
if (!option_fill_tabs_with_spaces) {
while (indent >= TAB_SIZE) {
edit_insert (edit, '\t');
indent -= TAB_SIZE;
}
}
while (indent--)
edit_insert (edit, ' ');
}
static void edit_auto_indent (WEdit * edit, int always)
{
long p;
int indent;
p = edit->curs1;
while (strchr ("\t\n\r ", edit_get_byte (edit, p - 1)) && p > 0) /* move back/up to a line with text */
p--;
indent = edit_indent_width (edit, edit_bol (edit, p));
if (edit->curs_col < indent)
indent = edit->curs_col;
edit_insert_indent (edit, indent);
}
static void edit_double_newline (WEdit * edit)
{
edit_insert (edit, '\n');
if (edit_get_byte (edit, edit->curs1) == '\n')
return;
if (edit_get_byte (edit, edit->curs1 - 2) == '\n')
return;
edit->force |= REDRAW_PAGE;
edit_insert (edit, '\n');
}
static void edit_tab_cmd (WEdit * edit)
{
int i;
if (option_fake_half_tabs) {
if (is_in_indent (edit)) {
/*insert a half tab (usually four spaces) unless there is a
half tab already behind, then delete it and insert a
full tab. */
if (right_of_four_spaces (edit)) {
for (i = 1; i <= HALF_TAB_SIZE; i++)
edit_backspace (edit);
if (option_fill_tabs_with_spaces) {
insert_spaces_tab (edit);
} else {
edit_insert (edit, '\t');
}
} else {
for (i = 1; i <= HALF_TAB_SIZE; i++)
edit_insert (edit, ' ');
}
return;
}
}
if (option_fill_tabs_with_spaces) {
insert_spaces_tab (edit);
} else {
edit_insert (edit, '\t');
}
return;
}
void format_paragraph (WEdit * edit, int force);
static void check_and_wrap_line (WEdit * edit)
{
int curs, c;
if (!option_typewriter_wrap)
return;
edit_update_curs_col (edit);
#ifdef MIDNIGHT
if (edit->curs_col < option_word_wrap_line_length)
#else
if (edit->curs_col < option_word_wrap_line_length * FONT_MEAN_WIDTH)
#endif
return;
curs = edit->curs1;
for (;;) {
curs--;
c = edit_get_byte (edit, curs);
if (c == '\n' || curs <= 0) {
edit_insert (edit, '\n');
return;
}
if (c == ' ' || c == '\t') {
int current = edit->curs1;
edit_cursor_move (edit, curs - edit->curs1 + 1);
edit_insert (edit, '\n');
edit_cursor_move (edit, current - edit->curs1 + 1);
return;
}
}
}
void edit_execute_macro (WEdit * edit, struct macro macro[], int n);
/* either command or char_for_insertion must be passed as -1 */
int edit_execute_cmd (WEdit * edit, int command, int char_for_insertion);
#ifdef MIDNIGHT
int edit_translate_key (WEdit * edit, unsigned int x_keycode, long x_key, int x_state, int *cmd, int *ch)
{
int command = -1;
int char_for_insertion = -1;
#include "edit_key_translator.c"
*cmd = command;
*ch = char_for_insertion;
if((command == -1 || command == 0) && char_for_insertion == -1) /* unchanged, key has no function here */
return 0;
return 1;
}
#endif
void edit_push_key_press (WEdit * edit)
{
edit_push_action (edit, KEY_PRESS + edit->start_display);
if (edit->mark2 == -1)
edit_push_action (edit, MARK_1 + edit->mark1);
}
/* this find the matching bracket in either direction, and sets edit->bracket */
void edit_find_bracket (WEdit * edit)
{
if (option_find_bracket) {
const char *b = "{}{[][()(", *p;
static int last_bracket = -1;
int i = 1, a, inc = -1, c, d, n = 0, j = 0;
long q;
edit->bracket = -1;
c = edit_get_byte (edit, edit->curs1);
p = strchr (b, c);
edit_update_curs_row (edit);
if (p) {
d = p[1];
if (strchr ("{[(", c))
inc = 1;
for (q = edit->curs1 + inc;; q += inc) {
if (q >= edit->last_byte || q < edit->start_display || j++ > 10000)
break;
a = edit_get_byte (edit, q);
if (inc > 0 && a == '\n')
n++;
if (n >= edit->num_widget_lines - edit->curs_row) /* out of screen */
break;
i += (a == c) - (a == d);
if (!i) {
edit->bracket = q;
break;
}
}
}
if (last_bracket != edit->bracket)
edit->force |= REDRAW_PAGE;
last_bracket = edit->bracket;
}
}
/* this executes a command as though the user initiated it through a key press. */
/* callback with WIDGET_KEY as a message calls this after translating the key
press */
/* this can be used to pass any command to the editor. Same as sendevent with
msg = WIDGET_COMMAND and par = command except the screen wouldn't update */
/* one of command or char_for_insertion must be passed as -1 */
/* commands are executed, and char_for_insertion is inserted at the cursor */
/* returns 0 if the command is a macro that was not found, 1 otherwise */
int edit_execute_key_command (WEdit * edit, int command, int char_for_insertion)
{
int r;
if (command == CK_Begin_Record_Macro) {
edit->macro_i = 0;
edit->force |= REDRAW_CHAR_ONLY | REDRAW_LINE;
return command;
}
if (command == CK_End_Record_Macro && edit->macro_i != -1) {
edit->force |= REDRAW_COMPLETELY;
edit_save_macro_cmd (edit, edit->macro, edit->macro_i);
edit->macro_i = -1;
return command;
}
if (edit->macro_i >= 0 && edit->macro_i < MAX_MACRO_LENGTH - 1) {
edit->macro[edit->macro_i].command = command;
edit->macro[edit->macro_i++].ch = char_for_insertion;
}
/* record the beginning of a set of editing actions initiated by a key press */
if (command != CK_Undo)
edit_push_key_press (edit);
r = edit_execute_cmd (edit, command, char_for_insertion);
return r;
}
#ifdef MIDNIGHT
static const char *shell_cmd[] = SHELL_COMMANDS_i
#else
static void (*user_commamd) (WEdit *, int) = 0;
void edit_set_user_command (void (*func) (WEdit *, int))
{
user_commamd = func;
}
#endif
void edit_mail_dialog (WEdit * edit);
/*
This executes a command at a lower level than macro recording.
It also does not push a key_press onto the undo stack. This means
that if it is called many times, a single undo command will undo
all of them. It also does not check for the Undo command.
Returns 0 if the command is a macro that was not found, 1
otherwise.
*/
int edit_execute_cmd (WEdit * edit, int command, int char_for_insertion)
{
int result = 1;
edit->force |= REDRAW_LINE;
if (edit->found_len)
/* the next key press will unhighlight the found string, so update whole page */
edit->force |= REDRAW_PAGE;
if (command / 100 == 6) { /* a highlight command like shift-arrow */
if (!edit->highlight || (edit->mark2 != -1 && edit->mark1 != edit->mark2)) {
edit_mark_cmd (edit, 1); /* clear */
edit_mark_cmd (edit, 0); /* marking on */
}
edit->highlight = 1;
} else { /* any other command */
if (edit->highlight)
edit_mark_cmd (edit, 0); /* clear */
edit->highlight = 0;
}
/* first check for undo */
if (command == CK_Undo) {
edit_do_undo (edit);
edit->found_len = 0;
edit->prev_col = edit_get_col (edit);
edit->search_start = edit->curs1;
return 1;
}
/* An ordinary key press */
if (char_for_insertion >= 0) {
if (edit->overwrite) {
if (edit_get_byte (edit, edit->curs1) != '\n')
edit_delete (edit);
}
edit_insert (edit, char_for_insertion);
if (option_auto_para_formatting) {
format_paragraph (edit, 0);
edit->force |= REDRAW_PAGE;
} else
check_and_wrap_line (edit);
edit->found_len = 0;
edit->prev_col = edit_get_col (edit);
edit->search_start = edit->curs1;
edit_find_bracket (edit);
return 1;
}
switch (command) {
case CK_Begin_Page:
case CK_End_Page:
case CK_Begin_Page_Highlight:
case CK_End_Page_Highlight:
case CK_Word_Left:
case CK_Word_Right:
case CK_Up:
case CK_Down:
case CK_Word_Left_Highlight:
case CK_Word_Right_Highlight:
case CK_Up_Highlight:
case CK_Down_Highlight:
if (edit->mark2 == -1)
break; /*marking is following the cursor: may need to highlight a whole line */
case CK_Left:
case CK_Right:
case CK_Left_Highlight:
case CK_Right_Highlight:
edit->force |= REDRAW_CHAR_ONLY;
}
/* basic cursor key commands */
switch (command) {
case CK_BackSpace:
if (option_backspace_through_tabs && is_in_indent (edit)) {
while (edit_get_byte (edit, edit->curs1 - 1) != '\n'
&& edit->curs1 > 0)
edit_backspace (edit);
break;
} else {
if (option_fake_half_tabs) {
int i;
if (is_in_indent (edit) && right_of_four_spaces (edit)) {
for (i = 0; i < HALF_TAB_SIZE; i++)
edit_backspace (edit);
break;
}
}
}
edit_backspace (edit);
break;
case CK_Delete:
if (option_fake_half_tabs) {
int i;
if (is_in_indent (edit) && left_of_four_spaces (edit)) {
for (i = 1; i <= HALF_TAB_SIZE; i++)
edit_delete (edit);
break;
}
}
edit_delete (edit);
break;
case CK_Delete_Word_Left:
edit_left_delete_word (edit);
break;
case CK_Delete_Word_Right:
edit_right_delete_word (edit);
break;
case CK_Delete_Line:
edit_delete_line (edit);
break;
case CK_Delete_To_Line_End:
edit_delete_to_line_end (edit);
break;
case CK_Delete_To_Line_Begin:
edit_delete_to_line_begin (edit);
break;
case CK_Enter:
if (option_auto_para_formatting) {
edit_double_newline (edit);
if (option_return_does_auto_indent)
edit_auto_indent (edit, 0);
format_paragraph (edit, 0);
} else if (option_return_does_auto_indent) {
edit_insert (edit, '\n');
edit_auto_indent (edit, 0);
} else {
edit_insert (edit, '\n');
}
break;
case CK_Return:
edit_insert (edit, '\n');
break;
case CK_Page_Up:
case CK_Page_Up_Highlight:
edit_move_up (edit, edit->num_widget_lines - 1, 1);
break;
case CK_Page_Down:
case CK_Page_Down_Highlight:
edit_move_down (edit, edit->num_widget_lines - 1, 1);
break;
case CK_Left:
case CK_Left_Highlight:
if (option_fake_half_tabs) {
if (is_in_indent (edit) && right_of_four_spaces (edit)) {
edit_cursor_move (edit, -HALF_TAB_SIZE);
edit->force &= (0xFFF - REDRAW_CHAR_ONLY);
break;
}
}
edit_cursor_move (edit, -1);
break;
case CK_Right:
case CK_Right_Highlight:
if (option_fake_half_tabs) {
if (is_in_indent (edit) && left_of_four_spaces (edit)) {
edit_cursor_move (edit, HALF_TAB_SIZE);
edit->force &= (0xFFF - REDRAW_CHAR_ONLY);
break;
}
}
edit_cursor_move (edit, 1);
break;
case CK_Begin_Page:
case CK_Begin_Page_Highlight:
edit_begin_page (edit);
break;
case CK_End_Page:
case CK_End_Page_Highlight:
edit_end_page (edit);
break;
case CK_Word_Left:
case CK_Word_Left_Highlight:
edit_left_word_move_cmd (edit);
break;
case CK_Word_Right:
case CK_Word_Right_Highlight:
edit_right_word_move_cmd (edit);
break;
case CK_Up:
case CK_Up_Highlight:
edit_move_up (edit, 1, 0);
break;
case CK_Down:
case CK_Down_Highlight:
edit_move_down (edit, 1, 0);
break;
case CK_Paragraph_Up:
case CK_Paragraph_Up_Highlight:
edit_move_up_paragraph (edit, 0);
break;
case CK_Paragraph_Down:
case CK_Paragraph_Down_Highlight:
edit_move_down_paragraph (edit, 0);
break;
case CK_Scroll_Up:
case CK_Scroll_Up_Highlight:
edit_move_up (edit, 1, 1);
break;
case CK_Scroll_Down:
case CK_Scroll_Down_Highlight:
edit_move_down (edit, 1, 1);
break;
case CK_Home:
case CK_Home_Highlight:
edit_cursor_to_bol (edit);
break;
case CK_End:
case CK_End_Highlight:
edit_cursor_to_eol (edit);
break;
case CK_Tab:
edit_tab_cmd (edit);
if (option_auto_para_formatting) {
format_paragraph (edit, 0);
edit->force |= REDRAW_PAGE;
} else
check_and_wrap_line (edit);
break;
case CK_Toggle_Insert:
edit->overwrite = (edit->overwrite == 0);
#ifndef MIDNIGHT
CSetCursorColor (edit->overwrite ? color_palette (24) : color_palette (19));
#endif
break;
case CK_Mark:
edit_mark_cmd (edit, 0);
break;
case CK_Unmark:
edit_mark_cmd (edit, 1);
break;
case CK_Beginning_Of_Text:
case CK_Beginning_Of_Text_Highlight:
edit_move_to_top (edit);
break;
case CK_End_Of_Text:
case CK_End_Of_Text_Highlight:
edit_move_to_bottom (edit);
break;
case CK_Copy:
edit_block_copy_cmd (edit);
break;
case CK_Remove:
edit_block_delete_cmd (edit);
break;
case CK_Move:
edit_block_move_cmd (edit);
break;
case CK_XStore:
edit_copy_to_X_buf_cmd (edit);
break;
case CK_XCut:
edit_cut_to_X_buf_cmd (edit);
break;
case CK_XPaste:
edit_paste_from_X_buf_cmd (edit);
break;
case CK_Selection_History:
edit_paste_from_history (edit);
break;
case CK_Save_As:
#ifndef MIDNIGHT
if (edit->widget->options & EDITOR_NO_FILE)
break;
#endif
edit_save_as_cmd (edit);
break;
case CK_Save:
#ifndef MIDNIGHT
if (edit->widget->options & EDITOR_NO_FILE)
break;
#endif
edit_save_confirm_cmd (edit);
break;
case CK_Load:
#ifndef MIDNIGHT
if (edit->widget->options & EDITOR_NO_FILE)
break;
#endif
edit_load_cmd (edit);
break;
case CK_Save_Block:
edit_save_block_cmd (edit);
break;
case CK_Insert_File:
edit_insert_file_cmd (edit);
break;
case CK_Find:
edit_search_cmd (edit, 0);
break;
case CK_Find_Again:
edit_search_cmd (edit, 1);
break;
case CK_Replace:
edit_replace_cmd (edit, 0);
break;
case CK_Replace_Again:
edit_replace_cmd (edit, 1);
break;
case CK_Exit:
edit_quit_cmd (edit);
break;
case CK_New:
edit_new_cmd (edit);
break;
case CK_Help:
edit_help_cmd (edit);
break;
case CK_Refresh:
edit_refresh_cmd (edit);
break;
case CK_Date:{
time_t t;
time (&t);
edit_printf (edit, ctime (&t));
edit->force |= REDRAW_PAGE;
break;
}
case CK_Goto:
edit_goto_cmd (edit);
break;
case CK_Paragraph_Format:
format_paragraph (edit, 1);
edit->force |= REDRAW_PAGE;
break;
case CK_Delete_Macro:
edit_delete_macro_cmd (edit);
break;
#ifdef MIDNIGHT
case CK_Sort:
edit_sort_cmd (edit);
break;
case CK_Mail:
edit_mail_dialog (edit);
break;
#endif
/* These commands are not handled and must be handled by the user application */
#ifndef MIDNIGHT
case CK_Sort:
case CK_Mail:
#endif
case CK_Complete:
case CK_Cancel:
case CK_Save_Desktop:
case CK_New_Window:
case CK_Cycle:
case CK_Menu:
case CK_Save_And_Quit:
case CK_Check_Save_And_Quit:
case CK_Run_Another:
result = 0;
break;
}
#ifdef MIDNIGHT
/* CK_Pipe_Block */
if ((command / 1000) == 1) /* a shell command */
edit_block_process_cmd (edit, shell_cmd[command - 1000], 1);
#else
if ((command / 1000) == 1) /* a user defined command */
if (user_commamd)
(*user_commamd) (edit, command - 1000);
#endif
if (command > CK_Macro (0) && command <= CK_Last_Macro) { /* a macro command */
struct macro m[MAX_MACRO_LENGTH];
int nm;
if ((result = edit_load_macro_cmd (edit, m, &nm, command - 2000)))
edit_execute_macro (edit, m, nm);
}
/* keys which must set the col position, and the search vars */
switch (command) {
case CK_Find:
case CK_Find_Again:
case CK_Replace:
case CK_Replace_Again:
edit->prev_col = edit_get_col (edit);
return 1;
break;
case CK_Up:
case CK_Up_Highlight:
case CK_Down:
case CK_Down_Highlight:
case CK_Page_Up:
case CK_Page_Up_Highlight:
case CK_Page_Down:
case CK_Page_Down_Highlight:
case CK_Beginning_Of_Text:
case CK_Beginning_Of_Text_Highlight:
case CK_End_Of_Text:
case CK_End_Of_Text_Highlight:
case CK_Paragraph_Up:
case CK_Paragraph_Up_Highlight:
case CK_Paragraph_Down:
case CK_Paragraph_Down_Highlight:
case CK_Scroll_Up:
case CK_Scroll_Up_Highlight:
case CK_Scroll_Down:
case CK_Scroll_Down_Highlight:
edit->search_start = edit->curs1;
edit->found_len = 0;
edit_find_bracket (edit);
return 1;
break;
default:
edit->found_len = 0;
edit->prev_col = edit_get_col (edit);
edit->search_start = edit->curs1;
}
edit_find_bracket (edit);
if (option_auto_para_formatting) {
switch (command) {
case CK_BackSpace:
case CK_Delete:
case CK_Delete_Word_Left:
case CK_Delete_Word_Right:
case CK_Delete_To_Line_End:
case CK_Delete_To_Line_Begin:
format_paragraph (edit, 0);
edit->force |= REDRAW_PAGE;
}
}
return result;
}
/* either command or char_for_insertion must be passed as -1 */
/* returns 0 if command is a macro that was not found, 1 otherwise */
int edit_execute_command (WEdit * edit, int command, int char_for_insertion)
{
int r;
r = edit_execute_cmd (edit, command, char_for_insertion);
edit_update_screen (edit);
return r;
}
void edit_execute_macro (WEdit * edit, struct macro macro[], int n)
{
int i = 0;
edit->force |= REDRAW_PAGE;
for (; i < n; i++) {
edit_execute_cmd (edit, macro[i].command, macro[i].ch);
}
edit_update_screen (edit);
}
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