source: editwin.c @ 3f11c00

release-1.7release-1.8release-1.9
Last change on this file since 3f11c00 was 3f11c00, checked in by David Benjamin <davidben@mit.edu>, 11 years ago
Rename oe_set_curswin to oe_set_window
  • Property mode set to 100644
File size: 31.1 KB
Line 
1#include "owl.h"
2#include <stdlib.h>
3#include <unistd.h>
4#include <string.h>
5#include <ctype.h>
6
7#define VALID_EXCURSION (0x9a2b4729)
8
9typedef struct _owl_editwin_excursion { /*noproto*/
10  int valid;
11  int index;
12  int mark;
13  int goal_column;
14  int lock;
15  struct _owl_editwin_excursion *next;
16} oe_excursion;
17
18struct _owl_editwin { /*noproto*/
19  char *buff;
20  owl_history *hist;
21  int bufflen;
22  int allocated;
23  int index;
24  int mark;
25  char *killbuf;
26  int goal_column;
27  int topindex;
28  int cursorx;
29  int winlines, wincols, fillcol, wrapcol;
30  owl_window *win;
31  gulong repaint_id;
32  gulong resized_id;
33  int style;
34  int lock;
35  int dotsend;
36  int echochar;
37  oe_excursion *excursions;
38
39  void (*callback)(struct _owl_editwin*);
40  void (*destroy_cbdata)(void *);
41  void *cbdata;
42};
43
44static void oe_set_window(owl_editwin *e, owl_window *w, int winlines, int wincols);
45static void oe_redraw(owl_window *win, WINDOW *curswin, void *user_data);
46static void oe_reframe(owl_editwin *e);
47static void oe_save_excursion(owl_editwin *e, oe_excursion *x);
48static void oe_release_excursion(owl_editwin *e, oe_excursion *x);
49static void oe_restore_excursion(owl_editwin *e, oe_excursion *x);
50static void oe_restore_mark_only(owl_editwin *e, oe_excursion *x);
51static int oe_char_width(gunichar c, int column);
52static int oe_region_width(owl_editwin *e, int start, int end, int width);
53static int oe_find_display_line(owl_editwin *e, int *x, int index, int *hard);
54static void oe_insert_char(owl_editwin *e, gunichar c);
55static int owl_editwin_limit_maxcols(int width, int cols);
56static int owl_editwin_check_dotsend(owl_editwin *e);
57static int owl_editwin_is_char_in(owl_editwin *e, const char *set);
58static gunichar owl_editwin_get_char_at_point(owl_editwin *e);
59static int owl_editwin_replace_internal(owl_editwin *e, int replace, const char *s);
60static const char *oe_copy_buf(owl_editwin *e, const char *buf, int len);
61static int oe_copy_region(owl_editwin *e);
62static char *oe_chunk(owl_editwin *e, int start, int end);
63static void oe_destroy_cbdata(owl_editwin *e);
64static void oe_dirty(owl_editwin *e);
65static void oe_window_resized(owl_window *w, owl_editwin *e);
66
67#define INCR 4096
68
69#define WHITESPACE " \n\t"
70
71static owl_editwin *owl_editwin_allocate(void)
72{
73  owl_editwin *e;
74  e = owl_malloc(sizeof(owl_editwin));
75  memset(e, 0, sizeof(*e));
76  return e;
77}
78
79void owl_editwin_delete(owl_editwin *e)
80{
81  if (e->win) {
82    g_signal_handler_disconnect(e->win, e->repaint_id);
83    g_signal_handler_disconnect(e->win, e->resized_id);
84  }
85  owl_free(e->buff);
86  owl_free(e->killbuf);
87  /* just in case someone forgot to clean up */
88  while (e->excursions) {
89    oe_release_excursion(e, e->excursions);
90  }
91  oe_destroy_cbdata(e);
92
93  owl_free(e);
94}
95
96static inline void oe_set_index(owl_editwin *e, int index)
97{
98  if (index != e->index) {
99    e->goal_column = -1;
100    e->cursorx = -1;
101  }
102  e->index = index;
103  oe_dirty(e);
104}
105
106static inline void oe_set_mark(owl_editwin *e, int mark)
107{
108  e->mark = mark;
109}
110
111void owl_editwin_set_mark(owl_editwin *e)
112{
113  oe_set_mark(e, e->index);
114  /* owl_function_makemsg("Mark set."); */
115}
116
117static void _owl_editwin_init(owl_editwin *e,
118                              int winlines,
119                              int wincols,
120                              int style,
121                              owl_history *hist)
122{
123  e->buff=owl_malloc(INCR);
124  e->buff[0]='\0';
125  e->bufflen=0;
126  e->hist=hist;
127  e->allocated=INCR;
128  oe_set_index(e, 0);
129  oe_set_mark(e, -1);
130  if (e->killbuf != NULL)
131    owl_free(e->killbuf);
132  e->killbuf = NULL;
133  e->goal_column = -1;
134  e->cursorx = -1;
135  e->topindex = 0;
136  e->excursions = NULL;
137  e->style=style;
138  if ((style!=OWL_EDITWIN_STYLE_MULTILINE) &&
139      (style!=OWL_EDITWIN_STYLE_ONELINE)) {
140    e->style=OWL_EDITWIN_STYLE_MULTILINE;
141  }
142  e->lock=0;
143  e->dotsend=0;
144  e->echochar='\0';
145}
146
147owl_editwin *owl_editwin_new(owl_window *win, int winlines, int wincols, int style, owl_history *hist)
148{
149  owl_editwin *e = owl_editwin_allocate();
150
151  _owl_editwin_init(e, winlines, wincols, style, hist);
152  oe_set_window(e, win, winlines, wincols);
153  return e;
154}
155
156static void oe_window_resized(owl_window *w, owl_editwin *e)
157{
158  /* update the sizes */
159  owl_window_get_position(w, &e->winlines, &e->wincols, NULL, NULL);
160}
161
162static void oe_set_window(owl_editwin *e, owl_window *w, int winlines, int wincols)
163{
164  e->win=w;
165  e->winlines=winlines;
166  e->wincols=wincols;
167  e->fillcol=owl_editwin_limit_maxcols(wincols-7, owl_global_get_edit_maxfillcols(&g));
168  if (e->style == OWL_EDITWIN_STYLE_MULTILINE)
169    e->wrapcol=owl_editwin_limit_maxcols(wincols-7, owl_global_get_edit_maxwrapcols(&g));
170  else
171    e->wrapcol = 0;
172  if (e->win) {
173    e->repaint_id = g_signal_connect(w, "redraw", G_CALLBACK(oe_redraw), e);
174    e->resized_id = g_signal_connect(w, "resized", G_CALLBACK(oe_window_resized), e);
175    owl_window_dirty(e->win);
176  }
177}
178
179/* echo the character 'ch' for each normal character keystroke,
180 * excepting locktext.  This is useful for entering passwords etc.  If
181 * ch=='\0' characters are echo'd normally
182 */
183void owl_editwin_set_echochar(owl_editwin *e, int ch)
184{
185  e->echochar=ch;
186  oe_dirty(e);
187}
188
189owl_history *owl_editwin_get_history(owl_editwin *e)
190{
191  return(e->hist);
192}
193
194void owl_editwin_set_dotsend(owl_editwin *e)
195{
196  e->dotsend=1;
197}
198
199void owl_editwin_set_callback(owl_editwin *e, void (*cb)(owl_editwin*))
200{
201  e->callback = cb;
202}
203
204void (*owl_editwin_get_callback(owl_editwin *e))(owl_editwin*)
205{
206  return e->callback;
207}
208
209static void oe_destroy_cbdata(owl_editwin *e) {
210  if (e->destroy_cbdata)
211    e->destroy_cbdata(e->cbdata);
212  e->cbdata = NULL;
213  e->destroy_cbdata = NULL;
214}
215
216void owl_editwin_set_cbdata(owl_editwin *e, void *data, void (*destroy)(void *))
217{
218  oe_destroy_cbdata(e);
219  e->cbdata = data;
220  e->destroy_cbdata = destroy;
221}
222
223void *owl_editwin_get_cbdata(owl_editwin *e) {
224  return e->cbdata;
225}
226
227void owl_editwin_do_callback(owl_editwin *e) {
228  void (*cb)(owl_editwin*);
229  cb=owl_editwin_get_callback(e);
230  if(!cb) {
231    owl_function_error("Internal error: No editwin callback!");
232  } else {
233    /* owl_function_error("text: |%s|", owl_editwin_get_text(e)); */
234    cb(e);
235  }
236}
237
238static int owl_editwin_limit_maxcols(int width, int cols)
239{
240  if (cols == 0)
241    return width;
242  return cols;
243}
244
245/* set text to be 'locked in' at the beginning of the buffer, any
246 * previous text (including locked text) will be overwritten
247 */
248void owl_editwin_set_locktext(owl_editwin *e, const char *text)
249{
250  oe_set_index(e, 0);
251  e->lock = 0;
252  owl_editwin_replace(e, e->bufflen, text);
253  e->buff[e->bufflen] = 0;
254  e->lock=e->bufflen;
255  oe_set_index(e, e->lock);
256  oe_dirty(e);
257}
258
259int owl_editwin_get_style(owl_editwin *e)
260{
261  return(e->style);
262}
263
264/* clear all text except for locktext and put the cursor at the
265 * beginning
266 */
267void owl_editwin_clear(owl_editwin *e)
268{
269
270  int lock = e->lock;
271  int dotsend=e->dotsend;
272  char *locktext=NULL;
273  char echochar=e->echochar;
274
275  if (lock > 0) {
276    locktext = owl_malloc(lock+1);
277    strncpy(locktext, e->buff, lock);
278    locktext[lock] = 0;
279  }
280
281  owl_free(e->buff);
282  _owl_editwin_init(e, e->winlines, e->wincols, e->style, e->hist);
283
284  if (lock > 0) {
285    owl_editwin_set_locktext(e, locktext);
286  }
287  if (dotsend) {
288    owl_editwin_set_dotsend(e);
289  }
290  if (echochar) {
291    owl_editwin_set_echochar(e, echochar);
292  }
293
294  if (locktext)
295    owl_free(locktext);
296
297  oe_set_index(e, lock);
298}
299
300void owl_editwin_recenter(owl_editwin *e)
301{
302  e->topindex = -1;
303  oe_dirty(e);
304}
305
306static void oe_save_excursion(owl_editwin *e, oe_excursion *x)
307{
308  x->index = e->index;
309  x->mark = e->mark;
310  x->goal_column = e->goal_column;
311  x->lock = e->lock;
312
313  x->valid = VALID_EXCURSION;
314  x->next = e->excursions;
315  e->excursions = x;
316}
317
318static void oe_release_excursion(owl_editwin *e, oe_excursion *x)
319{
320  oe_excursion **px;
321
322  x->valid = 0;
323  for (px = &e->excursions; *px != NULL; px = &(*px)->next)
324    if (*px == x) {
325      *px = x->next;
326      return;
327    }
328  abort();
329}
330
331static void oe_restore_excursion(owl_editwin *e, oe_excursion *x)
332{
333  if (x->valid == VALID_EXCURSION) {
334    oe_set_index(e, x->index);
335    e->goal_column = x->goal_column;
336    e->mark = x->mark;
337    e->lock = x->lock;
338
339    oe_release_excursion(e, x);
340  }
341}
342
343static void oe_restore_mark_only(owl_editwin *e, oe_excursion *x)
344{
345  if (x->valid == VALID_EXCURSION) {
346    e->mark = x->mark;
347
348    oe_release_excursion(e, x);
349  }
350}
351
352/* External interface to oe_save_excursion */
353owl_editwin_excursion *owl_editwin_begin_excursion(owl_editwin *e)
354{
355  owl_editwin_excursion *x = owl_malloc(sizeof *x);
356  oe_save_excursion(e, x);
357  return x;
358}
359
360void owl_editwin_end_excursion(owl_editwin *e, owl_editwin_excursion *x)
361{
362  oe_restore_excursion(e, x);
363  owl_free(x);
364}
365
366static inline const char *oe_next_point(owl_editwin *e, const char *p)
367{
368  const char *boundary = e->buff + e->bufflen + 1;
369  const char *q;
370
371  q = g_utf8_find_next_char(p, boundary);
372  while (q && g_unichar_ismark(g_utf8_get_char(q)))
373    q = g_utf8_find_next_char(q, boundary);
374
375  if (q == p)
376    return NULL;
377  return q;
378}
379
380static inline const char *oe_prev_point(owl_editwin *e, const char *p)
381{
382  const char *boundary = e->buff + e->lock;
383
384  p = g_utf8_find_prev_char(boundary, p);
385  while (p && g_unichar_ismark(g_utf8_get_char(p)))
386    p = g_utf8_find_prev_char(boundary, p);
387
388  return p;
389}
390
391static int oe_char_width(gunichar c, int column)
392{
393  int cw;
394
395  if (c == 9) /* TAB */
396    return TABSIZE - column % TABSIZE;
397
398  cw = mk_wcwidth(c);
399
400  if (cw < 0) /* control characters */
401    cw = 0;
402
403  return cw;
404}
405
406static int oe_find_display_line(owl_editwin *e, int *x, int index, int *hard)
407{
408  int width = 0, cw;
409  gunichar c;
410  const char *p;
411
412  while(1) {
413    /* note the position of the dot */
414    if (x != NULL && index == e->index && width < e->wincols)
415      *x = width;
416
417    /* get the current character */
418    c = g_utf8_get_char(e->buff + index);
419
420    /* figure out how wide it is */
421    cw = oe_char_width(c, width);
422
423    if (width + cw > e->wincols - 1) {
424      if (x != NULL && *x == width)
425        *x = -1;
426      if (hard != NULL) *hard = 0;
427      break;
428    }
429    width += cw;
430
431    if (c == '\n') {
432      if (width < e->wincols)
433        ++index; /* skip the newline */
434      if (hard != NULL) *hard = 1;
435      break;
436    }
437
438    /* find the next character */
439    p = oe_next_point(e, e->buff + index);
440    if (p == NULL) { /* we ran off the end */
441      if (x != NULL && e->index > index)
442        *x = width + 1;
443      if (hard != NULL) *hard = 1;
444      break;
445    }
446    index = p - e->buff;
447
448  }
449  return index;
450}
451
452static void oe_reframe(owl_editwin *e) {
453  oe_excursion x;
454  int goal = 1 + e->winlines / 2;
455  int index;
456  int count = 0;
457  int n, i;
458  int last;
459
460  oe_save_excursion(e, &x);
461  /* step back line-by-line through the buffer until we have >= goal lines of
462     display text */
463  e->lock = 0; /* we can (must) tread on the locktext */
464
465  last = -1;
466  while (count < goal) {
467    index = e->index;
468    owl_editwin_move_to_beginning_of_line(e);
469    if (last == e->index)
470      break;
471    last = e->index;
472    for (n = 0, i = e->index; i < index; n++)
473      i = oe_find_display_line(e, NULL, i, NULL);
474    count += n == 0 ? 1 : n;
475    if (count < goal)
476      owl_editwin_point_move(e, -1);
477  }
478
479  e->topindex = e->index;
480  /* if we overshot, backtrack */
481  for (n = 0; n < (count - goal); n++)
482    e->topindex = oe_find_display_line(e, NULL, e->topindex, NULL);
483
484  oe_restore_excursion(e, &x);
485  oe_dirty(e);
486}
487
488static void oe_addnec(owl_editwin *e, WINDOW *curswin, int count)
489{
490  int i;
491
492  for (i = 0; i < count; i++)
493    waddch(curswin, e->echochar);
494}
495
496static void oe_mvaddnec(owl_editwin *e, WINDOW *curswin, int y, int x, int count)
497{
498  wmove(curswin, y, x);
499  oe_addnec(e, curswin, count);
500}
501
502/* regenerate the text on the curses window */
503static void oe_redraw(owl_window *win, WINDOW *curswin, void *user_data)
504{
505  int x = -1, y = -1, t, hard;
506  int line, index, lineindex, times = 0;
507  owl_editwin *e = user_data;
508
509  do {
510    werase(curswin);
511
512    if (e->topindex == -1 || e->index < e->topindex)
513      oe_reframe(e);
514
515    line = 0;
516    index = e->topindex;
517    while(line < e->winlines) {
518      lineindex = index;
519      t = -1;
520      index = oe_find_display_line(e, &t, lineindex, &hard);
521      if (x == -1 && t != -1)
522        x = t, y = line;
523      if (index - lineindex) {
524        if (!e->echochar)
525          mvwaddnstr(curswin, line, 0,
526                     e->buff + lineindex,
527                     index - lineindex);
528        else {
529          if(lineindex < e->lock) {
530            mvwaddnstr(curswin, line, 0,
531                       e->buff + lineindex,
532                       MIN(index - lineindex,
533                           e->lock - lineindex));
534            if (e->lock < index)
535              oe_addnec(e, curswin,
536                        oe_region_width(e, e->lock, index,
537                                        oe_region_width(e, lineindex, e->lock, 0)));
538          } else
539            oe_mvaddnec(e, curswin, line, 0, oe_region_width(e, lineindex, index, 0));
540        }
541        if (!hard)
542          waddch(curswin, '\\');
543      }
544      line++;
545    }
546    if (x == -1)
547        e->topindex = -1; /* force a reframe */
548    times++;
549  } while(x == -1 && times < 3);
550
551  wmove(curswin, y, x);
552  e->cursorx = x;
553}
554
555static inline void oe_fixup(int *target, int start, int end, int change) {
556  if (*target > start) {
557    if (*target <= end)
558      *target = end + change;
559    else
560      *target += change;
561  }
562}
563
564int owl_editwin_replace_region(owl_editwin *e, const char *s)
565{
566  oe_excursion x;
567  int ret;
568
569  if (e->mark == -1) {
570    owl_function_error("The mark is unset, there is no region to replace.");
571    return 0;
572  }
573
574  oe_save_excursion(e, &x);
575
576  if(e->index > e->mark) {
577    owl_editwin_exchange_point_and_mark(e);
578  }
579
580  ret = owl_editwin_replace_internal(e, e->mark - e->index, s);
581
582  oe_restore_excursion(e, &x);
583
584  return ret;
585}
586
587/* replace 'replace' characters at the point with s, returning the change in size */
588int owl_editwin_replace(owl_editwin *e, int replace, const char *s)
589{
590  int start, end, i;
591  const char *p;
592
593  if (!g_utf8_validate(s, -1, NULL)) {
594    owl_function_debugmsg("owl_editwin_insert_string: received non-utf-8 string.");
595    return 0;
596  }
597
598  start = e->index;
599  for (i = 0, p = e->buff + start; i < replace && p != NULL; i++)
600    p = oe_next_point(e, p);
601  if (p != NULL)
602    end = p - e->buff;
603  else
604    end = e->bufflen;
605
606  return owl_editwin_replace_internal(e, end - start, s);
607}
608
609static int owl_editwin_replace_internal(owl_editwin *e, int replace, const char *s)
610{
611  int start, end, free, need, size, change;
612  oe_excursion *x;
613
614  start = e->index;
615  end   = start + replace;
616
617  free = e->allocated - e->bufflen + end - start;
618
619  need = strlen(s) - free;
620  if (need > 0) {
621    size = e->allocated + need + INCR - (need % INCR);
622    e->buff = owl_realloc(e->buff, size);
623    e->allocated = size;
624  }
625
626  memmove(e->buff + start + strlen(s), e->buff + end, e->bufflen + 1 - end);
627  memcpy(e->buff + start, s, strlen(s));
628  change = start - end + strlen(s);
629  e->bufflen += change;
630  e->index += strlen(s);
631
632  /* fix up the mark */
633  oe_fixup(&e->mark, start, end, change);
634  oe_fixup(&e->topindex, start, end, change);
635  /* fix up any saved points after the replaced area */
636  for (x = e->excursions; x != NULL; x = x->next) {
637    oe_fixup(&x->index, start, end, change);
638    oe_fixup(&x->mark, start, end, change);
639  }
640
641  /* recenter if needed */
642  if (start <= e->topindex)
643    owl_editwin_recenter(e);
644
645  oe_dirty(e);
646
647  return change;
648}
649
650/* linewrap the word just before the cursor.
651 * returns 0 on success
652 * returns -1 if we could not wrap.
653 */
654static void _owl_editwin_linewrap_word(owl_editwin *e)
655{
656  oe_excursion x;
657  gunichar c;
658
659  oe_save_excursion(e, &x);
660
661  while (owl_editwin_point_move(e, -1)) {
662    c = owl_editwin_get_char_at_point(e);
663    if (owl_util_can_break_after(c) || c == '\n') {
664      if (c != '\n')
665        owl_editwin_replace(e, c != ' ' ? 0 : 1, "\n");
666      break;
667    }
668  }
669
670  oe_restore_excursion(e, &x);
671}
672
673/* delete the character at the current point, following chars
674 * shift left.
675 */
676void owl_editwin_delete_char(owl_editwin *e)
677{
678  owl_editwin_replace(e, 1, "");
679}
680
681/* Swap the character at point with the character at point-1 and
682 * advance the pointer.  If point is at beginning of buffer do
683 * nothing.  If point is after the last character swap point-1 with
684 * point-2.  (Behaves as observed in tcsh and emacs).
685 */
686void owl_editwin_transpose_chars(owl_editwin *e)
687{
688  const char *middle, *end, *start;
689  char *tmp;
690
691  if (e->bufflen == 0) return;
692
693  if (e->index == e->bufflen)
694    owl_editwin_point_move(e, -1);     /* point is after last character */
695
696  if (owl_editwin_at_beginning_of_buffer(e))
697    return;     /* point is at beginning of buffer, do nothing */
698
699  /* Transpose two utf-8 unicode glyphs. */
700  middle = e->buff + e->index;
701
702  end = oe_next_point(e, middle);
703  if (end == NULL)
704    return;
705
706  start = oe_prev_point(e, middle);
707  if (start == NULL)
708    return;
709
710  tmp = owl_malloc((end - start) + 1);
711  tmp[(end - start)] = 0;
712  memcpy(tmp, middle, end - middle);
713  memcpy(tmp + (end - middle), start, middle - start);
714
715  owl_editwin_point_move(e, -1);
716  owl_editwin_replace(e, 2, tmp);
717}
718
719/* insert 'string' at the current point, later text is shifted
720 * right
721 */
722void owl_editwin_insert_string(owl_editwin *e, const char *s)
723{
724  owl_editwin_replace(e, 0, s);
725}
726
727/* We assume index is not set to point to a mid-char */
728static gunichar owl_editwin_get_char_at_point(owl_editwin *e)
729{
730  return g_utf8_get_char(e->buff + e->index);
731}
732
733void owl_editwin_exchange_point_and_mark(owl_editwin *e) {
734  int tmp;
735
736  if (e->mark != -1) {
737    tmp = e->mark;
738    owl_editwin_set_mark(e);
739    oe_set_index(e, tmp);
740  }
741}
742
743int owl_editwin_point_move(owl_editwin *e, int delta)
744{
745  const char *p;
746  int change, d = 0;
747
748  change = MAX(delta, - delta);
749  p = e->buff + e->index;
750
751  while (d < change && p != NULL) {
752    if (delta > 0)
753      p = oe_next_point(e, p);
754    else
755      p = oe_prev_point(e, p);
756    if (p != NULL) {
757      oe_set_index(e, p - e->buff);
758      d++;
759    }
760  }
761
762  return delta > 0 ? d : -d;
763}
764
765int owl_editwin_at_beginning_of_buffer(owl_editwin *e) {
766  if (e->index == e->lock)
767    return 1;
768
769  return 0;
770}
771
772int owl_at_end_of_buffer(owl_editwin *e) {
773  if (e->index == e->bufflen)
774    return 1;
775
776  return 0;
777}
778
779static int owl_editwin_at_beginning_of_line(owl_editwin *e)
780{
781  oe_excursion x;
782  int ret;
783
784  if (owl_editwin_at_beginning_of_buffer(e))
785    return 1;
786
787  oe_save_excursion(e, &x);
788  owl_editwin_point_move(e, -1);
789  ret = (owl_editwin_get_char_at_point(e) == '\n');
790  oe_restore_excursion(e, &x);
791
792  return ret;
793}
794
795static int owl_editwin_is_char_in(owl_editwin *e, const char *set)
796{
797  const char *p;
798
799  for (p = set; *p != 0; p = g_utf8_find_next_char(p, NULL))
800    if (owl_editwin_get_char_at_point(e) == g_utf8_get_char(p))
801      return 1;
802  return 0;
803}
804
805int owl_editwin_move_if_in(owl_editwin *e, int delta, const char *set)
806{
807  int change, distance = 0;
808  while (owl_editwin_is_char_in(e, set)) {
809    change = owl_editwin_point_move(e, delta);
810    distance += change;
811    if (change == 0)
812      break;
813  }
814  return distance;
815}
816
817int owl_editwin_move_if_not_in(owl_editwin *e, int delta, const char *set)
818{
819  int change, distance = 0;
820  while (!owl_editwin_is_char_in(e, set)) {
821    change = owl_editwin_point_move(e, delta);
822    distance += change;
823    if (change == 0)
824      break;
825  }
826  return distance;
827}
828
829int owl_editwin_move_to_beginning_of_line(owl_editwin *e)
830{
831  int distance = 0;
832
833  if (!owl_editwin_at_beginning_of_line(e)) {
834    /* move off the \n if were at the end of a line */
835    distance += owl_editwin_point_move(e, -1);
836    distance += owl_editwin_move_if_not_in(e, -1, "\n");
837    if (distance && !owl_editwin_at_beginning_of_buffer(e))
838      distance += owl_editwin_point_move(e, 1);
839  }
840  e->goal_column = 0; /* subtleties */
841
842  return distance;
843}
844
845int owl_editwin_move_to_end_of_line(owl_editwin *e)
846{
847  return owl_editwin_move_if_not_in(e, 1, "\n");
848}
849
850int owl_editwin_line_move(owl_editwin *e, int delta)
851{
852  int goal_column, change, ll, distance;
853  int count = 0;
854
855  change = MAX(delta, -delta);
856
857  goal_column = e->goal_column;
858  distance = owl_editwin_move_to_beginning_of_line(e);
859  goal_column = goal_column == -1 ? -distance : goal_column;
860
861  while(count < change) {
862    if (delta > 0) {
863      distance += owl_editwin_move_if_not_in(e, 1, "\n");
864      distance += owl_editwin_point_move(e, 1);
865    } else {
866      /* I really want to assert delta < 0 here */
867      distance += owl_editwin_point_move(e, -1); /* to the newline on
868                                                    the previous line */
869      distance += owl_editwin_move_to_beginning_of_line(e);
870    }
871    count++;
872  }
873
874  distance += (ll = owl_editwin_move_to_end_of_line(e));
875  if (ll > goal_column)
876    distance += owl_editwin_point_move(e, goal_column - ll);
877
878  e->goal_column = goal_column;
879  oe_dirty(e);
880
881  return distance;
882}
883
884void owl_editwin_backspace(owl_editwin *e)
885{
886  /* delete the char before the current one
887   * and shift later chars left
888   */
889  if(owl_editwin_point_move(e, -1))
890    owl_editwin_delete_char(e);
891}
892
893void owl_editwin_key_up(owl_editwin *e)
894{
895  owl_editwin_line_move(e, -1);
896}
897
898void owl_editwin_key_down(owl_editwin *e)
899{
900  owl_editwin_line_move(e, 1);
901}
902
903void owl_editwin_key_left(owl_editwin *e)
904{
905  owl_editwin_point_move(e, -1);
906}
907
908void owl_editwin_key_right(owl_editwin *e)
909{
910  owl_editwin_point_move(e, 1);
911}
912
913int owl_editwin_forward_word(owl_editwin *e)
914{
915  int distance;
916  /* if we're starting on a space, find the first non-space */
917  distance = owl_editwin_move_if_in(e, 1, WHITESPACE);
918
919  /* now find the end of this word */
920  distance += owl_editwin_move_if_not_in(e, 1, WHITESPACE);
921
922  return distance;
923}
924
925void owl_editwin_move_to_nextword(owl_editwin *e)
926{
927  owl_editwin_forward_word(e);
928}
929
930/* go backwards to the last non-space character
931 */
932int owl_editwin_backward_word(owl_editwin *e)
933{
934  oe_excursion x;
935  int distance = 0;
936  int further = 0;
937  int beginning;
938  /* if in middle of word, beginning of word */
939
940  /* if at beginning of a word, find beginning of previous word */
941
942  if (owl_editwin_is_char_in(e, WHITESPACE)) {
943    /* if in whitespace past end of word, find a word , the find the beginning*/
944    distance += owl_editwin_move_if_in(e, -1, WHITESPACE); /* leaves us on the last
945                                                              character of the word */
946    oe_save_excursion(e, &x);
947    /* are we at the beginning of a word? */
948    owl_editwin_point_move(e, -1);
949    beginning = owl_editwin_is_char_in(e, WHITESPACE);
950    oe_restore_excursion(e, &x);
951    if (beginning)
952      return distance;
953   } else {
954    /* in the middle of the word; */
955    oe_save_excursion(e, &x);
956    further += owl_editwin_point_move(e, -1);
957    if (owl_editwin_is_char_in(e, WHITESPACE)) { /* we were at the beginning */
958      distance += owl_editwin_backward_word(e); /* previous case */
959      oe_release_excursion(e, &x);
960      return distance + further;
961    } else {
962      oe_restore_excursion(e, &x);
963    }
964  }
965  distance += owl_editwin_move_if_not_in(e, -1, WHITESPACE);
966  /* will go past */
967  if (e->index > e->lock)
968    distance += owl_editwin_point_move(e, 1);
969  return distance;
970}
971
972void owl_editwin_move_to_previousword(owl_editwin *e)
973{
974  owl_editwin_backward_word(e);
975}
976
977void owl_editwin_delete_nextword(owl_editwin *e)
978{
979  oe_excursion x;
980
981  oe_save_excursion(e, &x);
982  oe_set_mark(e, e->index);
983  owl_editwin_forward_word(e);
984  owl_editwin_kill_region(e);
985  oe_restore_mark_only(e, &x);
986}
987
988void owl_editwin_delete_previousword(owl_editwin *e)
989{
990  oe_excursion x;
991
992  oe_save_excursion(e, &x);
993  oe_set_mark(e, e->index);
994  owl_editwin_backward_word(e);
995  owl_editwin_kill_region(e);
996  oe_restore_mark_only(e, &x);
997}
998
999void owl_editwin_move_to_line_end(owl_editwin *e)
1000{
1001  owl_editwin_move_to_end_of_line(e);
1002}
1003
1004void owl_editwin_delete_to_endofline(owl_editwin *e)
1005{
1006  oe_excursion x;
1007  int distance;
1008
1009  oe_save_excursion(e, &x);
1010  owl_editwin_set_mark(e);
1011  distance = owl_editwin_move_to_end_of_line(e);
1012  if (distance)
1013    owl_editwin_kill_region(e);
1014  else
1015    owl_editwin_replace(e, 1, "");
1016  oe_restore_excursion(e, &x);
1017}
1018
1019void owl_editwin_yank(owl_editwin *e)
1020{
1021  if (e->killbuf != NULL)
1022    owl_editwin_replace(e, 0, e->killbuf);
1023}
1024
1025static const char *oe_copy_buf(owl_editwin *e, const char *buf, int len)
1026{
1027  char *p;
1028
1029  p = owl_malloc(len + 1);
1030
1031  if (p != NULL) {
1032    owl_free(e->killbuf);
1033    e->killbuf = p;
1034    memcpy(e->killbuf, buf, len);
1035    e->killbuf[len] = 0;
1036  }
1037
1038  return p;
1039}
1040
1041static int oe_copy_region(owl_editwin *e)
1042{
1043  const char *p;
1044  int start, end;
1045
1046  if (e->mark == -1)
1047    return 0;
1048
1049  start = MIN(e->index, e->mark);
1050  end = MAX(e->index, e->mark);
1051
1052  p = oe_copy_buf(e, e->buff + start, end - start);
1053  if (p != NULL)
1054    return end - start;
1055  return 0;
1056}
1057
1058void owl_editwin_copy_region_as_kill(owl_editwin *e)
1059{
1060  oe_copy_region(e);
1061}
1062
1063void owl_editwin_kill_region(owl_editwin *e)
1064{
1065  if (e->index > e->mark)
1066    owl_editwin_exchange_point_and_mark(e);
1067
1068  owl_editwin_replace_internal(e, oe_copy_region(e), "");
1069}
1070
1071void owl_editwin_move_to_line_start(owl_editwin *e)
1072{
1073  owl_editwin_move_to_beginning_of_line(e);
1074}
1075
1076void owl_editwin_move_to_end(owl_editwin *e)
1077{
1078  oe_set_index(e, e->bufflen);
1079}
1080
1081void owl_editwin_move_to_top(owl_editwin *e)
1082{
1083  oe_set_index(e, e->lock);
1084}
1085
1086void owl_editwin_backward_paragraph(owl_editwin *e)
1087{
1088  owl_editwin_point_move(e, -1);
1089  for (; e->index >= e->lock; owl_editwin_point_move(e, -1)) {
1090    if (e->index <= e->lock ||
1091        ((e->buff[e->index] == '\n') && (e->buff[e->index - 1]=='\n')))
1092      break;
1093  }
1094}
1095
1096void owl_editwin_forward_paragraph(owl_editwin *e)
1097{
1098  owl_editwin_point_move(e, 1);
1099  /* scan forward to the start of the next paragraph */
1100  for(; e->index < e->bufflen; owl_editwin_point_move(e, 1)) {
1101    if (e->buff[e->index -1] == '\n' && e->buff[e->index] == '\n')
1102      break;
1103  }
1104}
1105
1106int owl_editwin_current_column(owl_editwin *e)
1107{
1108  oe_excursion x;
1109  int lineindex;
1110
1111  oe_save_excursion(e, &x);
1112  owl_editwin_move_to_beginning_of_line(e);
1113  lineindex = e->index;
1114  oe_restore_excursion(e, &x);
1115  return oe_region_width(e, lineindex, e->index, 0);
1116}
1117
1118void owl_editwin_fill_paragraph(owl_editwin *e)
1119{
1120  oe_excursion x;
1121  gunichar ch;
1122  int sentence;
1123
1124  if (e->fillcol < 0)
1125    /* auto-fill disabled */
1126    return;
1127
1128  oe_save_excursion(e, &x);
1129
1130  /* Mark the end of the paragraph */
1131  owl_editwin_forward_paragraph(e);
1132  /* Skip the trailing newline */
1133  owl_editwin_point_move(e, -1);
1134  owl_editwin_set_mark(e);
1135
1136  owl_editwin_backward_paragraph(e);
1137
1138  /* Don't mess with the leading newline */
1139  if (owl_editwin_get_char_at_point(e) == '\n')
1140    owl_editwin_point_move(e, 1);
1141
1142  /*
1143   * First pass: Scan forward replacing all series of spaces with ' '
1144   * (or nothing after CJK ideograms)
1145   */
1146  sentence = 0;
1147  for(;e->index < e->mark; owl_editwin_point_move(e, 1)) {
1148    /* bail if we hit a trailing dot on the buffer */
1149    if (strcmp(e->buff + e->index, "\n.") == 0) {
1150      owl_editwin_set_mark(e);
1151      break;
1152    }
1153
1154    ch = owl_editwin_get_char_at_point(e);
1155
1156    if (owl_util_can_break_after(ch) || ch == '\n') {
1157      if (g_unichar_isspace(ch)) {
1158        owl_editwin_replace(e, 1, " ");
1159      }
1160
1161      if (sentence && g_unichar_isspace(owl_editwin_get_char_at_point(e))
1162          && e->index < e->mark)
1163        owl_editwin_point_move(e, 1);
1164
1165      while(g_unichar_isspace(owl_editwin_get_char_at_point(e))
1166            && e->index < e->mark) {
1167        owl_editwin_delete_char(e);
1168      }
1169    }
1170
1171    if(ch == '.' || ch == '!' || ch == '?')
1172      sentence = 1;
1173    else
1174      sentence = 0;
1175  }
1176
1177  owl_editwin_backward_paragraph(e);
1178
1179  /* Now go through inserting newlines as needed */
1180  while(e->index < e->mark) {
1181    /* if we've travelled too far, linewrap */
1182    if (owl_editwin_current_column(e) >= e->fillcol)
1183      _owl_editwin_linewrap_word(e);
1184    owl_editwin_point_move(e, 1);
1185  }
1186
1187  oe_restore_excursion(e, &x);
1188}
1189
1190/* returns true if only whitespace remains */
1191int owl_editwin_is_at_end(owl_editwin *e)
1192{
1193  return (only_whitespace(e->buff + e->index));
1194}
1195
1196static int owl_editwin_check_dotsend(owl_editwin *e)
1197{
1198  int zdot = 0;
1199  oe_excursion x;
1200
1201  if (!e->dotsend) return(0);
1202  if (!owl_editwin_is_at_end(e)) return (0);
1203
1204  oe_save_excursion(e, &x);
1205
1206  owl_editwin_point_move(e, -3);
1207
1208  if(strncmp(e->buff + e->index, "\n.\n", 3) == 0) {
1209    owl_editwin_point_move(e, 1);
1210    zdot = 1;
1211  } else if(e->index == e->lock &&
1212            strncmp(e->buff + e->index, ".\n", 2) == 0) {
1213    zdot = 1;
1214  }
1215
1216  if(zdot) {
1217    owl_editwin_set_mark(e);
1218    owl_editwin_move_to_end(e);
1219    owl_editwin_replace_region(e, "");
1220  }
1221
1222  oe_restore_excursion(e, &x);
1223
1224  return zdot;
1225}
1226
1227void owl_editwin_post_process_char(owl_editwin *e, owl_input j)
1228{
1229  /* XXX force a redisplay? */
1230  if ((j.ch==13 || j.ch==10) && owl_editwin_check_dotsend(e)) {
1231    owl_command_edit_done(e);
1232    return;
1233  }
1234}
1235
1236static int oe_region_width(owl_editwin *e, int start, int end, int offset)
1237{
1238  const char *p;
1239  int width = offset;
1240 
1241  for(p = e->buff + start;
1242      p < e->buff + end;
1243      p = g_utf8_find_next_char(p, NULL))
1244    width += oe_char_width(g_utf8_get_char(p), width);
1245
1246  return width - offset;
1247}
1248
1249static void oe_insert_char(owl_editwin *e, gunichar c)
1250{
1251  oe_excursion x;
1252  char tmp[7];
1253  int replaced = -1;
1254
1255  if (c == '\r') /* translate CRs to NLs */
1256    c = '\n';
1257
1258  if (!g_unichar_iscntrl(c) || c == '\n' || c== '\t' ) {
1259    if (c == '\n' && e->style == OWL_EDITWIN_STYLE_ONELINE) {
1260      return;
1261    }
1262
1263    if (e->wrapcol > 0 && e->cursorx != -1 &&
1264        e->cursorx + oe_char_width(c, e->cursorx) > e->wrapcol) {
1265      /* XXX this is actually wrong:
1266       * + If the line has been been wrapped, we can be past the wrap column but
1267       *   e->cursorx be much smaller.
1268       * + If the user went back and inserted a bunch of stuff in the middle of
1269       *   the line, there may be more than one word past the wrap column.
1270       */
1271      oe_save_excursion(e, &x);
1272
1273      if (c == ' ' || c == '\t') {
1274        owl_editwin_point_move(e, -1);
1275        replaced = -owl_editwin_move_if_in(e, -1, " \t");
1276        if (!replaced) {
1277          c = '\n';
1278          replaced = -1;
1279        }
1280      } else {
1281        while(!owl_editwin_at_beginning_of_line(e)) {
1282          owl_editwin_point_move(e, -1);
1283          if (owl_util_can_break_after(owl_editwin_get_char_at_point(e))) {
1284            replaced = -owl_editwin_move_if_in(e, -1, " \t");
1285            break;
1286          }
1287        }
1288        if (owl_editwin_at_beginning_of_line(e))
1289          replaced = -1;
1290      }
1291      if (replaced && !owl_editwin_at_beginning_of_line(e))
1292        owl_editwin_point_move(e, 1);
1293      if (replaced >= 0) {
1294        owl_editwin_replace(e, replaced, "\n");
1295      }
1296      oe_restore_excursion(e, &x);
1297    }
1298
1299    if (replaced >= 0 && (c == ' ' || c == '\t'))
1300      return; /* our work here is done */
1301
1302    tmp[g_unichar_to_utf8(c, tmp)] = '\0';
1303    owl_editwin_replace(e, 0, tmp);
1304  }
1305}
1306
1307void owl_editwin_process_char(owl_editwin *e, owl_input j)
1308{
1309  if (j.ch == ERR)
1310    return;
1311  /* Ignore ncurses control characters. */
1312  if (j.ch < 0x100) {
1313    oe_insert_char(e, j.uch);
1314  }
1315}
1316
1317const char *owl_editwin_get_text(owl_editwin *e)
1318{
1319  return(e->buff+e->lock);
1320}
1321
1322char *owl_editwin_get_region(owl_editwin *e)
1323{
1324  int start, end;
1325  start = e->index;
1326  end   = e->mark;
1327  if(start > end) {
1328    int tmp = end;
1329    end = start;
1330    start = tmp;
1331  }
1332
1333  return oe_chunk(e, start, end);
1334}
1335
1336int owl_editwin_get_echochar(owl_editwin *e)
1337{
1338  return e->echochar;
1339}
1340
1341static char *oe_chunk(owl_editwin *e, int start, int end)
1342{
1343  char *p;
1344 
1345  p = owl_malloc(end - start + 1);
1346  memcpy(p, e->buff + start, end - start);
1347  p[end - start] = 0;
1348
1349  return p;
1350}
1351
1352/*
1353 * The only guarantee made about these values is that comparisons
1354 * between them, as well as comparison between multiple calls to these
1355 * functions without modifying the editwin in-between, are meaningful.
1356 */
1357
1358int owl_editwin_get_point(owl_editwin *e)
1359{
1360  return e->index;
1361}
1362
1363int owl_editwin_get_mark(owl_editwin *e)
1364{
1365  return e->mark;
1366}
1367
1368static void oe_dirty(owl_editwin *e)
1369{
1370  if (e->win) owl_window_dirty(e->win);
1371}
1372
1373
1374/*
1375 * Local Variables:
1376 * mode:C
1377 * c-basic-offset:2
1378 * End:
1379 */
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