source: editwin.c

Last change on this file was 7dcef03, checked in by Anders Kaseorg <andersk@mit.edu>, 4 years ago
Use the Glib slice allocator for fixed-size objects The slice allocator, available since GLib 2.10, is more space-efficient than [g_]malloc. Since BarnOwl is obviously at the leading edge of space-efficient technology, this seems like a natural fit. Use it for every fixed-size object except owl_viewwin_search_data (which would need an extra destroy_cbdata function to g_slice_free it). Signed-off-by: Anders Kaseorg <andersk@mit.edu>
  • Property mode set to 100644
File size: 32.8 KB
Line 
1#include "owl.h"
2
3#define VALID_EXCURSION (0x9a2b4729)
4
5typedef struct _owl_editwin_excursion { /*noproto*/
6  int valid;
7  int index;
8  int mark;
9  int goal_column;
10  int lock;
11  struct _owl_editwin_excursion *next;
12} oe_excursion;
13
14struct _owl_editwin { /*noproto*/
15  int refcount;
16  char *buff;
17  owl_history *hist;
18  int bufflen;
19  int allocated;
20  int index;
21  int mark;
22  int goal_column;
23  int topindex;
24  int column;
25  int winlines, wincols, fillcol, wrapcol;
26  owl_window *win;
27  gulong repaint_id;
28  gulong resized_id;
29  int style;
30  int lock;
31  int dotsend;
32  int echochar;
33  oe_excursion *excursions;
34
35  void (*callback)(struct _owl_editwin *e, bool success);
36  void (*destroy_cbdata)(void *);
37  void *cbdata;
38};
39
40static void oe_set_window(owl_editwin *e, owl_window *w, int winlines, int wincols);
41static void oe_redraw(owl_window *win, WINDOW *curswin, void *user_data);
42static void oe_reframe(owl_editwin *e);
43static void oe_save_excursion(owl_editwin *e, oe_excursion *x);
44static void oe_release_excursion(owl_editwin *e, oe_excursion *x);
45static void oe_restore_excursion(owl_editwin *e, oe_excursion *x);
46static void oe_restore_mark_only(owl_editwin *e, oe_excursion *x);
47static int oe_char_width(gunichar c, int column);
48static int oe_region_column(owl_editwin *e, int start, int end, int offset);
49static int oe_region_width(owl_editwin *e, int start, int end, int offset);
50static int oe_find_display_line(owl_editwin *e, int *x, int index, int *hard);
51static void oe_insert_char(owl_editwin *e, gunichar c);
52static int owl_editwin_limit_maxcols(int width, int cols);
53static int owl_editwin_check_dotsend(owl_editwin *e);
54static int owl_editwin_is_char_in(owl_editwin *e, const char *set);
55static gunichar owl_editwin_get_char_at_point(owl_editwin *e);
56static int owl_editwin_replace_internal(owl_editwin *e, int replace, const char *s);
57static const char *oe_copy_buf(owl_editwin *e, const char *buf, int len);
58static int oe_copy_region(owl_editwin *e);
59static CALLER_OWN char *oe_chunk(owl_editwin *e, int start, int end);
60static void oe_destroy_cbdata(owl_editwin *e);
61static void oe_dirty(owl_editwin *e);
62static void oe_window_resized(owl_window *w, owl_editwin *e);
63
64#define INCR 4096
65
66#define WHITESPACE " \n\t"
67
68static CALLER_OWN owl_editwin *owl_editwin_allocate(void)
69{
70  owl_editwin *e = g_slice_new0(owl_editwin);
71  e->refcount = 1;
72  return e;
73}
74
75static void _owl_editwin_delete(owl_editwin *e)
76{
77  if (e->win) {
78    g_signal_handler_disconnect(e->win, e->repaint_id);
79    g_signal_handler_disconnect(e->win, e->resized_id);
80    g_object_unref(e->win);
81  }
82  g_free(e->buff);
83  /* just in case someone forgot to clean up */
84  while (e->excursions) {
85    oe_release_excursion(e, e->excursions);
86  }
87  oe_destroy_cbdata(e);
88
89  g_slice_free(owl_editwin, e);
90}
91
92static inline void oe_set_index(owl_editwin *e, int index)
93{
94  if (index != e->index) {
95    e->goal_column = -1;
96    e->column = -1;
97  }
98  e->index = index;
99  oe_dirty(e);
100}
101
102static inline void oe_set_mark(owl_editwin *e, int mark)
103{
104  e->mark = mark;
105}
106
107void owl_editwin_set_mark(owl_editwin *e)
108{
109  oe_set_mark(e, e->index);
110  /* owl_function_makemsg("Mark set."); */
111}
112
113static void _owl_editwin_init(owl_editwin *e,
114                              int winlines,
115                              int wincols,
116                              int style,
117                              owl_history *hist)
118{
119  e->buff=g_new(char, INCR);
120  e->buff[0]='\0';
121  e->bufflen=0;
122  e->hist=hist;
123  e->allocated=INCR;
124  oe_set_index(e, 0);
125  oe_set_mark(e, -1);
126  e->goal_column = -1;
127  e->column = -1;
128  e->topindex = 0;
129  e->excursions = NULL;
130  e->style=style;
131  if ((style!=OWL_EDITWIN_STYLE_MULTILINE) &&
132      (style!=OWL_EDITWIN_STYLE_ONELINE)) {
133    e->style=OWL_EDITWIN_STYLE_MULTILINE;
134  }
135  e->lock=0;
136  e->dotsend=0;
137  e->echochar='\0';
138}
139
140CALLER_OWN owl_editwin *owl_editwin_new(owl_window *win, int winlines, int wincols, int style, owl_history *hist)
141{
142  owl_editwin *e = owl_editwin_allocate();
143
144  _owl_editwin_init(e, winlines, wincols, style, hist);
145  oe_set_window(e, win, winlines, wincols);
146  return e;
147}
148
149owl_editwin *owl_editwin_ref(owl_editwin *e)
150{
151  e->refcount++;
152  return e;
153}
154
155void owl_editwin_unref(owl_editwin *e)
156{
157  e->refcount--;
158  if (e->refcount <= 0)
159    _owl_editwin_delete(e);
160}
161
162/* TODO: collapse this window into oe_window_resized. Need to stop
163 * passing winlines and wincols to oe_set_window and get them out of
164 * the owl_window. The tester code will first need to pass in an
165 * owl_window headless or so. */
166static void oe_set_window_size(owl_editwin *e, int winlines, int wincols)
167{
168  e->winlines=winlines;
169  e->wincols=wincols;
170  /* fillcol and wrapcol may have changed. */
171  e->fillcol=owl_editwin_limit_maxcols(wincols-7, owl_global_get_edit_maxfillcols(&g));
172  if (e->style == OWL_EDITWIN_STYLE_MULTILINE)
173    e->wrapcol=owl_editwin_limit_maxcols(wincols-7, owl_global_get_edit_maxwrapcols(&g));
174  else
175    e->wrapcol = 0;
176}
177
178static void oe_window_resized(owl_window *w, owl_editwin *e)
179{
180  int winlines, wincols;
181  owl_window_get_position(w, &winlines, &wincols, NULL, NULL);
182  oe_set_window_size(e, winlines, wincols);
183}
184
185static void oe_set_window(owl_editwin *e, owl_window *w, int winlines, int wincols)
186{
187  e->win=w;
188  oe_set_window_size(e, winlines, wincols);
189  if (e->win) {
190    g_object_ref(e->win);
191    e->repaint_id = g_signal_connect(w, "redraw", G_CALLBACK(oe_redraw), e);
192    e->resized_id = g_signal_connect(w, "resized", G_CALLBACK(oe_window_resized), e);
193    owl_window_dirty(e->win);
194  }
195}
196
197owl_window *owl_editwin_get_window(owl_editwin *e)
198{
199  return e->win;
200}
201
202/* echo the character 'ch' for each normal character keystroke,
203 * excepting locktext.  This is useful for entering passwords etc.  If
204 * ch=='\0' characters are echo'd normally
205 */
206void owl_editwin_set_echochar(owl_editwin *e, int ch)
207{
208  e->echochar=ch;
209  oe_dirty(e);
210}
211
212owl_history *owl_editwin_get_history(owl_editwin *e)
213{
214  return(e->hist);
215}
216
217void owl_editwin_set_dotsend(owl_editwin *e)
218{
219  e->dotsend=1;
220}
221
222void owl_editwin_set_callback(owl_editwin *e, void (*cb)(owl_editwin *, bool))
223{
224  e->callback = cb;
225}
226
227void (*owl_editwin_get_callback(owl_editwin *e))(owl_editwin *, bool)
228{
229  return e->callback;
230}
231
232static void oe_destroy_cbdata(owl_editwin *e) {
233  if (e->destroy_cbdata)
234    e->destroy_cbdata(e->cbdata);
235  e->cbdata = NULL;
236  e->destroy_cbdata = NULL;
237}
238
239void owl_editwin_set_cbdata(owl_editwin *e, void *data, void (*destroy)(void *))
240{
241  oe_destroy_cbdata(e);
242  e->cbdata = data;
243  e->destroy_cbdata = destroy;
244}
245
246void *owl_editwin_get_cbdata(owl_editwin *e) {
247  return e->cbdata;
248}
249
250void owl_editwin_do_callback(owl_editwin *e, bool success)
251{
252  void (*cb)(owl_editwin *, bool);
253  cb = owl_editwin_get_callback(e);
254  if (!cb) {
255    owl_function_error("Internal error: No editwin callback!");
256  } else {
257    cb(e, success);
258  }
259}
260
261static int owl_editwin_limit_maxcols(int width, int cols)
262{
263  if (cols == 0)
264    return width;
265  return cols;
266}
267
268/* set text to be 'locked in' at the beginning of the buffer, any
269 * previous text (including locked text) will be overwritten
270 */
271void owl_editwin_set_locktext(owl_editwin *e, const char *text)
272{
273  oe_set_index(e, 0);
274  e->lock = 0;
275  owl_editwin_replace(e, e->bufflen, text);
276  e->buff[e->bufflen] = 0;
277  e->lock=e->bufflen;
278  oe_set_index(e, e->lock);
279  oe_dirty(e);
280}
281
282int owl_editwin_get_style(owl_editwin *e)
283{
284  return(e->style);
285}
286
287/* clear all text except for locktext and put the cursor at the
288 * beginning
289 */
290void owl_editwin_clear(owl_editwin *e)
291{
292
293  int lock = e->lock;
294  int dotsend=e->dotsend;
295  char *locktext=NULL;
296  char echochar=e->echochar;
297
298  if (lock > 0) {
299    locktext = g_strndup(e->buff, lock);
300  }
301
302  g_free(e->buff);
303  _owl_editwin_init(e, e->winlines, e->wincols, e->style, e->hist);
304
305  if (lock > 0) {
306    owl_editwin_set_locktext(e, locktext);
307  }
308  if (dotsend) {
309    owl_editwin_set_dotsend(e);
310  }
311  if (echochar) {
312    owl_editwin_set_echochar(e, echochar);
313  }
314
315  g_free(locktext);
316
317  oe_set_index(e, lock);
318}
319
320void owl_editwin_recenter(owl_editwin *e)
321{
322  e->topindex = -1;
323  oe_dirty(e);
324}
325
326static void oe_save_excursion(owl_editwin *e, oe_excursion *x)
327{
328  x->index = e->index;
329  x->mark = e->mark;
330  x->goal_column = e->goal_column;
331  x->lock = e->lock;
332
333  x->valid = VALID_EXCURSION;
334  x->next = e->excursions;
335  e->excursions = x;
336}
337
338static void oe_release_excursion(owl_editwin *e, oe_excursion *x)
339{
340  oe_excursion **px;
341
342  x->valid = 0;
343  for (px = &e->excursions; *px != NULL; px = &(*px)->next)
344    if (*px == x) {
345      *px = x->next;
346      return;
347    }
348  abort();
349}
350
351static void oe_restore_excursion(owl_editwin *e, oe_excursion *x)
352{
353  if (x->valid == VALID_EXCURSION) {
354    oe_set_index(e, x->index);
355    e->goal_column = x->goal_column;
356    e->mark = x->mark;
357    e->lock = x->lock;
358
359    oe_release_excursion(e, x);
360  }
361}
362
363static void oe_restore_mark_only(owl_editwin *e, oe_excursion *x)
364{
365  if (x->valid == VALID_EXCURSION) {
366    e->mark = x->mark;
367
368    oe_release_excursion(e, x);
369  }
370}
371
372/* External interface to oe_save_excursion */
373owl_editwin_excursion *owl_editwin_begin_excursion(owl_editwin *e)
374{
375  owl_editwin_excursion *x = g_slice_new(owl_editwin_excursion);
376  oe_save_excursion(e, x);
377  return x;
378}
379
380void owl_editwin_end_excursion(owl_editwin *e, owl_editwin_excursion *x)
381{
382  oe_restore_excursion(e, x);
383  g_slice_free(owl_editwin_excursion, x);
384}
385
386static inline const char *oe_next_point(owl_editwin *e, const char *p)
387{
388  const char *boundary = e->buff + e->bufflen + 1;
389  const char *q;
390
391  q = g_utf8_find_next_char(p, boundary);
392  while (q && g_unichar_ismark(g_utf8_get_char(q)))
393    q = g_utf8_find_next_char(q, boundary);
394
395  if (q == p)
396    return NULL;
397  return q;
398}
399
400static inline const char *oe_prev_point(owl_editwin *e, const char *p)
401{
402  const char *boundary = e->buff + e->lock;
403
404  p = g_utf8_find_prev_char(boundary, p);
405  while (p && g_unichar_ismark(g_utf8_get_char(p)))
406    p = g_utf8_find_prev_char(boundary, p);
407
408  return p;
409}
410
411static int oe_char_width(gunichar c, int column)
412{
413  int cw;
414
415  if (c == 9) /* TAB */
416    return TABSIZE - column % TABSIZE;
417
418  cw = mk_wcwidth(c);
419
420  if (cw < 0) /* control characters */
421    cw = 0;
422
423  return cw;
424}
425
426/* Finds the display line of 'e' starting at the character
427 * 'index'. The index just after the line is returned. Whether the
428 * line ends at a hard break (newline) or soft break (wrapping) is
429 * returned in 'hard'.
430 *
431 * If the point (e->index) is contained in the line, its position is
432 * returned in 'x'.
433 */
434static int oe_find_display_line(owl_editwin *e, int *x, int index, int *hard)
435{
436  int width = 0, cw;
437  gunichar c;
438  const char *p;
439
440  while(1) {
441    /* note the position of the dot */
442    if (x != NULL && index == e->index && width < e->wincols)
443      *x = width;
444
445    /* get the current character */
446    c = g_utf8_get_char(e->buff + index);
447
448    /* figure out how wide it is */
449    cw = oe_char_width(c, width);
450
451    if (width + cw > e->wincols - 1) {
452      if (x != NULL && *x == width)
453        *x = -1;
454      if (hard != NULL) *hard = 0;
455      break;
456    }
457    width += cw;
458
459    if (c == '\n') {
460      if (width < e->wincols)
461        ++index; /* skip the newline */
462      if (hard != NULL) *hard = 1;
463      break;
464    }
465
466    /* find the next character */
467    p = oe_next_point(e, e->buff + index);
468    if (p == NULL) { /* we ran off the end */
469      if (x != NULL && e->index > index)
470        *x = width + 1;
471      if (hard != NULL) *hard = 1;
472      break;
473    }
474    index = p - e->buff;
475
476  }
477  return index;
478}
479
480static void oe_reframe(owl_editwin *e) {
481  oe_excursion x;
482  int goal = 1 + e->winlines / 2;
483  int index;
484  int count = 0;
485  int n, i;
486  int last;
487
488  oe_save_excursion(e, &x);
489  /* step back line-by-line through the buffer until we have >= goal lines of
490     display text */
491  e->lock = 0; /* we can (must) tread on the locktext */
492
493  last = -1;
494  while (count < goal) {
495    index = e->index;
496    owl_editwin_move_to_beginning_of_line(e);
497    if (last == e->index)
498      break;
499    last = e->index;
500    for (n = 0, i = e->index; i < index; n++)
501      i = oe_find_display_line(e, NULL, i, NULL);
502    count += n == 0 ? 1 : n;
503    if (count < goal)
504      owl_editwin_point_move(e, -1);
505  }
506
507  e->topindex = e->index;
508  /* if we overshot, backtrack */
509  for (n = 0; n < (count - goal); n++)
510    e->topindex = oe_find_display_line(e, NULL, e->topindex, NULL);
511
512  oe_restore_excursion(e, &x);
513  oe_dirty(e);
514}
515
516static void oe_addnec(owl_editwin *e, WINDOW *curswin, int count)
517{
518  int i;
519
520  for (i = 0; i < count; i++)
521    waddch(curswin, e->echochar);
522}
523
524static void oe_mvaddnec(owl_editwin *e, WINDOW *curswin, int y, int x, int count)
525{
526  wmove(curswin, y, x);
527  oe_addnec(e, curswin, count);
528}
529
530/* regenerate the text on the curses window */
531static void oe_redraw(owl_window *win, WINDOW *curswin, void *user_data)
532{
533  int x = -1, y = -1, t, hard;
534  int line, index, lineindex, times = 0;
535  owl_editwin *e = user_data;
536
537  do {
538    werase(curswin);
539
540    if (e->topindex == -1 || e->index < e->topindex)
541      oe_reframe(e);
542
543    line = 0;
544    index = e->topindex;
545    while(line < e->winlines) {
546      lineindex = index;
547      t = -1;
548      index = oe_find_display_line(e, &t, lineindex, &hard);
549      if (x == -1 && t != -1)
550        x = t, y = line;
551      if (index - lineindex) {
552        if (!e->echochar)
553          mvwaddnstr(curswin, line, 0,
554                     e->buff + lineindex,
555                     index - lineindex);
556        else {
557          if(lineindex < e->lock) {
558            mvwaddnstr(curswin, line, 0,
559                       e->buff + lineindex,
560                       MIN(index - lineindex,
561                           e->lock - lineindex));
562            if (e->lock < index)
563              oe_addnec(e, curswin,
564                        oe_region_width(e, e->lock, index,
565                                        oe_region_width(e, lineindex, e->lock, 0)));
566          } else
567            oe_mvaddnec(e, curswin, line, 0, oe_region_width(e, lineindex, index, 0));
568        }
569        if (!hard)
570          waddch(curswin, '\\');
571      }
572      line++;
573    }
574    if (x == -1)
575        e->topindex = -1; /* force a reframe */
576    times++;
577  } while(x == -1 && times < 3);
578
579  wmove(curswin, y, x);
580}
581
582static inline void oe_fixup(int *target, int start, int end, int change) {
583  if (*target > start) {
584    if (*target <= end)
585      *target = end + change;
586    else
587      *target += change;
588  }
589}
590
591int owl_editwin_replace_region(owl_editwin *e, const char *s)
592{
593  oe_excursion x;
594  int ret;
595
596  if (e->mark == -1) {
597    owl_function_error("The mark is unset, there is no region to replace.");
598    return 0;
599  }
600
601  oe_save_excursion(e, &x);
602
603  if(e->index > e->mark) {
604    owl_editwin_exchange_point_and_mark(e);
605  }
606
607  ret = owl_editwin_replace_internal(e, e->mark - e->index, s);
608
609  oe_restore_excursion(e, &x);
610
611  return ret;
612}
613
614/* replace 'replace' characters at the point with s, returning the change in size */
615int owl_editwin_replace(owl_editwin *e, int replace, const char *s)
616{
617  int start, end, i;
618  const char *p;
619
620  if (!g_utf8_validate(s, -1, NULL)) {
621    owl_function_debugmsg("owl_editwin_insert_string: received non-UTF-8 string.");
622    return 0;
623  }
624
625  start = e->index;
626  for (i = 0, p = e->buff + start; i < replace && p != NULL; i++)
627    p = oe_next_point(e, p);
628  if (p != NULL)
629    end = p - e->buff;
630  else
631    end = e->bufflen;
632
633  return owl_editwin_replace_internal(e, end - start, s);
634}
635
636static int owl_editwin_replace_internal(owl_editwin *e, int replace, const char *s)
637{
638  int start, end, free, need, size, change, oldindex;
639  oe_excursion *x;
640
641  start = e->index;
642  end   = start + replace;
643
644  free = e->allocated - e->bufflen + end - start;
645
646  need = strlen(s) - free;
647  if (need > 0) {
648    size = e->allocated + need + INCR - (need % INCR);
649    e->buff = g_renew(char, e->buff, size);
650    e->allocated = size;
651  }
652
653  memmove(e->buff + start + strlen(s), e->buff + end, e->bufflen + 1 - end);
654  memcpy(e->buff + start, s, strlen(s));
655  change = start - end + strlen(s);
656  e->bufflen += change;
657  oldindex = e->index;
658  e->index += strlen(s);
659  if (e->column != -1)
660    e->column = oe_region_column(e, oldindex, e->index, e->column);
661
662  /* fix up the mark */
663  oe_fixup(&e->mark, start, end, change);
664  oe_fixup(&e->topindex, start, end, change);
665  /* fix up any saved points after the replaced area */
666  for (x = e->excursions; x != NULL; x = x->next) {
667    oe_fixup(&x->index, start, end, change);
668    oe_fixup(&x->mark, start, end, change);
669  }
670
671  /* recenter if needed */
672  if (start <= e->topindex)
673    owl_editwin_recenter(e);
674
675  oe_dirty(e);
676
677  return change;
678}
679
680/* linewrap the word just before the cursor.
681 * returns 0 on success
682 * returns -1 if we could not wrap.
683 */
684static void _owl_editwin_linewrap_word(owl_editwin *e)
685{
686  oe_excursion x;
687  gunichar c;
688
689  oe_save_excursion(e, &x);
690
691  while (owl_editwin_point_move(e, -1)) {
692    c = owl_editwin_get_char_at_point(e);
693    if (owl_util_can_break_after(c) || c == '\n') {
694      if (c != '\n')
695        owl_editwin_replace(e, c != ' ' ? 0 : 1, "\n");
696      break;
697    }
698  }
699
700  oe_restore_excursion(e, &x);
701}
702
703/* delete the character at the current point, following chars
704 * shift left.
705 */
706void owl_editwin_delete_char(owl_editwin *e)
707{
708  owl_editwin_replace(e, 1, "");
709}
710
711/* Swap the character at point with the character at point-1 and
712 * advance the pointer.  If point is at beginning of buffer do
713 * nothing.  If point is after the last character swap point-1 with
714 * point-2.  (Behaves as observed in tcsh and emacs).
715 */
716void owl_editwin_transpose_chars(owl_editwin *e)
717{
718  const char *middle, *end, *start;
719  char *tmp;
720
721  if (e->bufflen == 0) return;
722
723  if (e->index == e->bufflen)
724    owl_editwin_point_move(e, -1);     /* point is after last character */
725
726  if (owl_editwin_at_beginning_of_buffer(e))
727    return;     /* point is at beginning of buffer, do nothing */
728
729  /* Transpose two utf-8 unicode glyphs. */
730  middle = e->buff + e->index;
731
732  end = oe_next_point(e, middle);
733  if (end == NULL)
734    return;
735
736  start = oe_prev_point(e, middle);
737  if (start == NULL)
738    return;
739
740  tmp = g_new(char, (end - start) + 1);
741  tmp[(end - start)] = 0;
742  memcpy(tmp, middle, end - middle);
743  memcpy(tmp + (end - middle), start, middle - start);
744
745  owl_editwin_point_move(e, -1);
746  owl_editwin_replace(e, 2, tmp);
747}
748
749/* insert 'string' at the current point, later text is shifted
750 * right
751 */
752void owl_editwin_insert_string(owl_editwin *e, const char *s)
753{
754  owl_editwin_replace(e, 0, s);
755}
756
757/* We assume index is not set to point to a mid-char */
758static gunichar owl_editwin_get_char_at_point(owl_editwin *e)
759{
760  return g_utf8_get_char(e->buff + e->index);
761}
762
763void owl_editwin_exchange_point_and_mark(owl_editwin *e) {
764  int tmp;
765
766  if (e->mark != -1) {
767    tmp = e->mark;
768    owl_editwin_set_mark(e);
769    oe_set_index(e, tmp);
770  }
771}
772
773int owl_editwin_point_move(owl_editwin *e, int delta)
774{
775  const char *p;
776  int change, d = 0;
777
778  change = MAX(delta, - delta);
779  p = e->buff + e->index;
780
781  while (d < change && p != NULL) {
782    if (delta > 0)
783      p = oe_next_point(e, p);
784    else
785      p = oe_prev_point(e, p);
786    if (p != NULL) {
787      oe_set_index(e, p - e->buff);
788      d++;
789    }
790  }
791
792  return delta > 0 ? d : -d;
793}
794
795int owl_editwin_at_beginning_of_buffer(owl_editwin *e) {
796  if (e->index == e->lock)
797    return 1;
798
799  return 0;
800}
801
802int owl_at_end_of_buffer(owl_editwin *e) {
803  if (e->index == e->bufflen)
804    return 1;
805
806  return 0;
807}
808
809static int owl_editwin_at_beginning_of_line(owl_editwin *e)
810{
811  oe_excursion x;
812  int ret;
813
814  if (owl_editwin_at_beginning_of_buffer(e))
815    return 1;
816
817  oe_save_excursion(e, &x);
818  owl_editwin_point_move(e, -1);
819  ret = (owl_editwin_get_char_at_point(e) == '\n');
820  oe_restore_excursion(e, &x);
821
822  return ret;
823}
824
825static int owl_editwin_is_char_in(owl_editwin *e, const char *set)
826{
827  const char *p;
828
829  for (p = set; *p != 0; p = g_utf8_find_next_char(p, NULL))
830    if (owl_editwin_get_char_at_point(e) == g_utf8_get_char(p))
831      return 1;
832  return 0;
833}
834
835int owl_editwin_move_if_in(owl_editwin *e, int delta, const char *set)
836{
837  int change, distance = 0;
838  while (owl_editwin_is_char_in(e, set)) {
839    change = owl_editwin_point_move(e, delta);
840    distance += change;
841    if (change == 0)
842      break;
843  }
844  return distance;
845}
846
847int owl_editwin_move_if_not_in(owl_editwin *e, int delta, const char *set)
848{
849  int change, distance = 0;
850  while (!owl_editwin_is_char_in(e, set)) {
851    change = owl_editwin_point_move(e, delta);
852    distance += change;
853    if (change == 0)
854      break;
855  }
856  return distance;
857}
858
859int owl_editwin_move_to_beginning_of_line(owl_editwin *e)
860{
861  int distance = 0;
862
863  if (!owl_editwin_at_beginning_of_line(e)) {
864    /* move off the \n if were at the end of a line */
865    distance += owl_editwin_point_move(e, -1);
866    distance += owl_editwin_move_if_not_in(e, -1, "\n");
867    /* If we stopped because we reached a '\n', rather than because we
868     * hit the top of the buffer, move forward from the end of the
869     * previous line to the start of the current. */
870    if (owl_editwin_get_char_at_point(e) == '\n')
871      distance += owl_editwin_point_move(e, 1);
872  }
873  e->goal_column = 0; /* subtleties */
874
875  return distance;
876}
877
878int owl_editwin_move_to_end_of_line(owl_editwin *e)
879{
880  return owl_editwin_move_if_not_in(e, 1, "\n");
881}
882
883int owl_editwin_line_move(owl_editwin *e, int delta)
884{
885  int goal_column, change, ll, distance;
886  int count = 0;
887
888  change = MAX(delta, -delta);
889
890  goal_column = e->goal_column;
891  distance = owl_editwin_move_to_beginning_of_line(e);
892  goal_column = goal_column == -1 ? -distance : goal_column;
893
894  while(count < change) {
895    if (delta > 0) {
896      distance += owl_editwin_move_if_not_in(e, 1, "\n");
897      distance += owl_editwin_point_move(e, 1);
898    } else {
899      /* I really want to assert delta < 0 here */
900      distance += owl_editwin_point_move(e, -1); /* to the newline on
901                                                    the previous line */
902      distance += owl_editwin_move_to_beginning_of_line(e);
903    }
904    count++;
905  }
906
907  distance += (ll = owl_editwin_move_to_end_of_line(e));
908  if (ll > goal_column)
909    distance += owl_editwin_point_move(e, goal_column - ll);
910
911  e->goal_column = goal_column;
912  oe_dirty(e);
913
914  return distance;
915}
916
917void owl_editwin_backspace(owl_editwin *e)
918{
919  /* delete the char before the current one
920   * and shift later chars left
921   */
922  if(owl_editwin_point_move(e, -1))
923    owl_editwin_delete_char(e);
924}
925
926void owl_editwin_key_up(owl_editwin *e)
927{
928  owl_editwin_line_move(e, -1);
929}
930
931void owl_editwin_key_down(owl_editwin *e)
932{
933  owl_editwin_line_move(e, 1);
934}
935
936void owl_editwin_key_left(owl_editwin *e)
937{
938  owl_editwin_point_move(e, -1);
939}
940
941void owl_editwin_key_right(owl_editwin *e)
942{
943  owl_editwin_point_move(e, 1);
944}
945
946int owl_editwin_forward_word(owl_editwin *e)
947{
948  int distance;
949  /* if we're starting on a space, find the first non-space */
950  distance = owl_editwin_move_if_in(e, 1, WHITESPACE);
951
952  /* now find the end of this word */
953  distance += owl_editwin_move_if_not_in(e, 1, WHITESPACE);
954
955  return distance;
956}
957
958void owl_editwin_move_to_nextword(owl_editwin *e)
959{
960  owl_editwin_forward_word(e);
961}
962
963/* go backwards to the last non-space character
964 */
965int owl_editwin_backward_word(owl_editwin *e)
966{
967  oe_excursion x;
968  int distance = 0;
969  int further = 0;
970  int beginning;
971  /* if in middle of word, beginning of word */
972
973  /* if at beginning of a word, find beginning of previous word */
974
975  if (owl_editwin_is_char_in(e, WHITESPACE)) {
976    /* if in whitespace past end of word, find a word , the find the beginning*/
977    distance += owl_editwin_move_if_in(e, -1, WHITESPACE); /* leaves us on the last
978                                                              character of the word */
979    oe_save_excursion(e, &x);
980    /* are we at the beginning of a word? */
981    owl_editwin_point_move(e, -1);
982    beginning = owl_editwin_is_char_in(e, WHITESPACE);
983    oe_restore_excursion(e, &x);
984    if (beginning)
985      return distance;
986   } else {
987    /* in the middle of the word; */
988    oe_save_excursion(e, &x);
989    further += owl_editwin_point_move(e, -1);
990    if (owl_editwin_is_char_in(e, WHITESPACE)) { /* we were at the beginning */
991      distance += owl_editwin_backward_word(e); /* previous case */
992      oe_release_excursion(e, &x);
993      return distance + further;
994    } else {
995      oe_restore_excursion(e, &x);
996    }
997  }
998  distance += owl_editwin_move_if_not_in(e, -1, WHITESPACE);
999  /* will go past */
1000  if (e->index > e->lock)
1001    distance += owl_editwin_point_move(e, 1);
1002  return distance;
1003}
1004
1005void owl_editwin_move_to_previousword(owl_editwin *e)
1006{
1007  owl_editwin_backward_word(e);
1008}
1009
1010void owl_editwin_delete_nextword(owl_editwin *e)
1011{
1012  oe_excursion x;
1013
1014  oe_save_excursion(e, &x);
1015  oe_set_mark(e, e->index);
1016  owl_editwin_forward_word(e);
1017  owl_editwin_kill_region(e);
1018  oe_restore_mark_only(e, &x);
1019}
1020
1021void owl_editwin_delete_previousword(owl_editwin *e)
1022{
1023  oe_excursion x;
1024
1025  oe_save_excursion(e, &x);
1026  oe_set_mark(e, e->index);
1027  owl_editwin_backward_word(e);
1028  owl_editwin_kill_region(e);
1029  oe_restore_mark_only(e, &x);
1030}
1031
1032void owl_editwin_move_to_line_end(owl_editwin *e)
1033{
1034  owl_editwin_move_to_end_of_line(e);
1035}
1036
1037void owl_editwin_delete_to_endofline(owl_editwin *e)
1038{
1039  oe_excursion x;
1040  int distance;
1041
1042  oe_save_excursion(e, &x);
1043  owl_editwin_set_mark(e);
1044  distance = owl_editwin_move_to_end_of_line(e);
1045  if (distance)
1046    owl_editwin_kill_region(e);
1047  else
1048    owl_editwin_replace(e, 1, "");
1049  oe_restore_excursion(e, &x);
1050}
1051
1052void owl_editwin_yank(owl_editwin *e)
1053{
1054  const char *killbuf = owl_global_get_kill_buffer(&g);
1055
1056  if (killbuf != NULL)
1057    owl_editwin_replace(e, 0, killbuf);
1058}
1059
1060static const char *oe_copy_buf(owl_editwin *e, const char *buf, int len)
1061{
1062  owl_global_set_kill_buffer(&g, buf, len);
1063  return owl_global_get_kill_buffer(&g);
1064}
1065
1066static int oe_copy_region(owl_editwin *e)
1067{
1068  const char *p;
1069  int start, end;
1070
1071  if (e->mark == -1)
1072    return 0;
1073
1074  start = MIN(e->index, e->mark);
1075  end = MAX(e->index, e->mark);
1076
1077  p = oe_copy_buf(e, e->buff + start, end - start);
1078  if (p != NULL)
1079    return end - start;
1080  return 0;
1081}
1082
1083void owl_editwin_copy_region_as_kill(owl_editwin *e)
1084{
1085  oe_copy_region(e);
1086}
1087
1088void owl_editwin_kill_region(owl_editwin *e)
1089{
1090  if (e->index > e->mark)
1091    owl_editwin_exchange_point_and_mark(e);
1092
1093  owl_editwin_replace_internal(e, oe_copy_region(e), "");
1094}
1095
1096void owl_editwin_move_to_line_start(owl_editwin *e)
1097{
1098  owl_editwin_move_to_beginning_of_line(e);
1099}
1100
1101void owl_editwin_move_to_end(owl_editwin *e)
1102{
1103  oe_set_index(e, e->bufflen);
1104}
1105
1106void owl_editwin_move_to_top(owl_editwin *e)
1107{
1108  oe_set_index(e, e->lock);
1109}
1110
1111void owl_editwin_backward_paragraph(owl_editwin *e)
1112{
1113  owl_editwin_point_move(e, -1);
1114  for (; e->index >= e->lock; owl_editwin_point_move(e, -1)) {
1115    if (e->index <= e->lock ||
1116        ((e->buff[e->index] == '\n') && (e->buff[e->index - 1]=='\n')))
1117      break;
1118  }
1119}
1120
1121void owl_editwin_forward_paragraph(owl_editwin *e)
1122{
1123  owl_editwin_point_move(e, 1);
1124  /* scan forward to the start of the next paragraph */
1125  for(; e->index < e->bufflen; owl_editwin_point_move(e, 1)) {
1126    if (e->buff[e->index -1] == '\n' && e->buff[e->index] == '\n')
1127      break;
1128  }
1129}
1130
1131int owl_editwin_current_column(owl_editwin *e)
1132{
1133  if (e->column == -1) {
1134    oe_excursion x;
1135    int lineindex;
1136
1137    oe_save_excursion(e, &x);
1138    owl_editwin_move_to_beginning_of_line(e);
1139    lineindex = e->index;
1140    oe_restore_excursion(e, &x);
1141    e->column = oe_region_width(e, lineindex, e->index, 0);
1142  }
1143  return e->column;
1144}
1145
1146void owl_editwin_fill_paragraph(owl_editwin *e)
1147{
1148  oe_excursion x;
1149  gunichar ch = 0;
1150  gunichar last_ch;
1151  int sentence;
1152
1153  if (e->fillcol < 0)
1154    /* auto-fill disabled */
1155    return;
1156
1157  oe_save_excursion(e, &x);
1158
1159  /* Mark the end of the paragraph */
1160  owl_editwin_forward_paragraph(e);
1161  /* Skip the trailing newline */
1162  owl_editwin_point_move(e, -1);
1163  owl_editwin_set_mark(e);
1164
1165  owl_editwin_backward_paragraph(e);
1166
1167  /* Don't mess with the leading newline */
1168  if (owl_editwin_get_char_at_point(e) == '\n')
1169    owl_editwin_point_move(e, 1);
1170
1171  /*
1172   * First pass: Scan forward replacing all series of spaces with ' '
1173   * (or nothing after CJK ideograms)
1174   */
1175  sentence = 0;
1176  for(;e->index < e->mark; owl_editwin_point_move(e, 1)) {
1177    /* bail if we hit a trailing dot on the buffer */
1178    if (strcmp(e->buff + e->index, "\n.") == 0) {
1179      owl_editwin_set_mark(e);
1180      break;
1181    }
1182
1183    last_ch = ch;
1184    ch = owl_editwin_get_char_at_point(e);
1185
1186    if (owl_util_can_break_after(ch) || ch == '\n') {
1187      if (g_unichar_isspace(ch)) {
1188        owl_editwin_replace(e, 1, " ");
1189      }
1190
1191      if (sentence && g_unichar_isspace(owl_editwin_get_char_at_point(e))
1192          && e->index < e->mark)
1193        owl_editwin_point_move(e, 1);
1194
1195      while(g_unichar_isspace(owl_editwin_get_char_at_point(e))
1196            && e->index < e->mark) {
1197        owl_editwin_delete_char(e);
1198      }
1199    }
1200
1201    if (ch == '.' || ch == '!' || ch == '?' ||
1202        (ch == '"' && (last_ch == '.' || last_ch == '!' || last_ch == '?')))
1203      sentence = 1;
1204    else
1205      sentence = 0;
1206  }
1207
1208  owl_editwin_backward_paragraph(e);
1209
1210  /* Now go through inserting newlines as needed */
1211  while(e->index < e->mark) {
1212    /* if we've travelled too far, linewrap */
1213    if (owl_editwin_current_column(e) >= e->fillcol)
1214      _owl_editwin_linewrap_word(e);
1215    owl_editwin_point_move(e, 1);
1216  }
1217
1218  oe_restore_excursion(e, &x);
1219}
1220
1221/* returns true if only whitespace remains */
1222int owl_editwin_is_at_end(owl_editwin *e)
1223{
1224  return (only_whitespace(e->buff + e->index));
1225}
1226
1227static int owl_editwin_check_dotsend(owl_editwin *e)
1228{
1229  int zdot = 0;
1230  oe_excursion x;
1231
1232  if (!e->dotsend) return(0);
1233  if (!owl_editwin_is_at_end(e)) return (0);
1234
1235  oe_save_excursion(e, &x);
1236
1237  owl_editwin_point_move(e, -3);
1238
1239  if(strncmp(e->buff + e->index, "\n.\n", 3) == 0) {
1240    owl_editwin_point_move(e, 1);
1241    zdot = 1;
1242  } else if(e->index == e->lock &&
1243            strncmp(e->buff + e->index, ".\n", 2) == 0) {
1244    zdot = 1;
1245  }
1246
1247  if(zdot) {
1248    owl_editwin_set_mark(e);
1249    owl_editwin_move_to_end(e);
1250    owl_editwin_replace_region(e, "");
1251  }
1252
1253  oe_restore_excursion(e, &x);
1254
1255  return zdot;
1256}
1257
1258void owl_editwin_post_process_char(owl_editwin *e, owl_input j)
1259{
1260  /* XXX force a redisplay? */
1261  if ((j.ch==13 || j.ch==10) && owl_editwin_check_dotsend(e)) {
1262    owl_command_edit_done(e);
1263    return;
1264  }
1265}
1266
1267static int oe_region_column(owl_editwin *e, int start, int end, int offset)
1268{
1269  const char *p;
1270  int column = offset;
1271
1272  for(p = e->buff + start;
1273      p < e->buff + end;
1274      p = g_utf8_find_next_char(p, NULL)) {
1275    gunichar c = g_utf8_get_char(p);
1276    if (c == '\n')
1277      column = 0;
1278    else
1279      column += oe_char_width(c, column);
1280  }
1281  return column;
1282}
1283
1284static int oe_region_width(owl_editwin *e, int start, int end, int offset)
1285{
1286  const char *p;
1287  int width = offset;
1288 
1289  for(p = e->buff + start;
1290      p < e->buff + end;
1291      p = g_utf8_find_next_char(p, NULL))
1292    width += oe_char_width(g_utf8_get_char(p), width);
1293
1294  return width - offset;
1295}
1296
1297static void oe_insert_char(owl_editwin *e, gunichar c)
1298{
1299  oe_excursion x;
1300  char tmp[7];
1301  int replaced = -1;
1302  int column;
1303
1304  if (c == '\r') /* translate CRs to NLs */
1305    c = '\n';
1306
1307  if (!g_unichar_iscntrl(c) || c == '\n' || c== '\t' ) {
1308    if (c == '\n' && e->style == OWL_EDITWIN_STYLE_ONELINE) {
1309      return;
1310    }
1311
1312    column = owl_editwin_current_column(e);
1313    if (e->wrapcol > 0 && column != -1 &&
1314        column + oe_char_width(c, column) > e->wrapcol) {
1315      /* XXX this is actually wrong:
1316       * + If the user went back and inserted a bunch of stuff in the middle of
1317       *   the line, there may be more than one word past the wrap column.
1318       */
1319      oe_save_excursion(e, &x);
1320
1321      if (c == ' ' || c == '\t') {
1322        owl_editwin_point_move(e, -1);
1323        replaced = -owl_editwin_move_if_in(e, -1, " \t");
1324        if (!replaced) {
1325          c = '\n';
1326          replaced = -1;
1327        }
1328      } else {
1329        while(!owl_editwin_at_beginning_of_line(e)) {
1330          owl_editwin_point_move(e, -1);
1331          if (owl_util_can_break_after(owl_editwin_get_char_at_point(e))) {
1332            replaced = -owl_editwin_move_if_in(e, -1, " \t");
1333            break;
1334          }
1335        }
1336        if (owl_editwin_at_beginning_of_line(e))
1337          replaced = -1;
1338      }
1339      if (replaced && !owl_editwin_at_beginning_of_line(e))
1340        owl_editwin_point_move(e, 1);
1341      if (replaced >= 0) {
1342        owl_editwin_replace(e, replaced, "\n");
1343      }
1344      oe_restore_excursion(e, &x);
1345    }
1346
1347    if (replaced >= 0 && (c == ' ' || c == '\t'))
1348      return; /* our work here is done */
1349
1350    tmp[g_unichar_to_utf8(c, tmp)] = '\0';
1351    owl_editwin_replace(e, 0, tmp);
1352  }
1353}
1354
1355void owl_editwin_process_char(owl_editwin *e, owl_input j)
1356{
1357  if (j.ch == ERR)
1358    return;
1359  /* Ignore ncurses control characters. */
1360  if (j.ch < 0x100) {
1361    oe_insert_char(e, j.uch);
1362  }
1363}
1364
1365const char *owl_editwin_get_text(owl_editwin *e)
1366{
1367  return(e->buff+e->lock);
1368}
1369
1370CALLER_OWN char *owl_editwin_get_region(owl_editwin *e)
1371{
1372  int start, end;
1373  start = e->index;
1374  end   = e->mark;
1375  if(start > end) {
1376    int tmp = end;
1377    end = start;
1378    start = tmp;
1379  }
1380
1381  return oe_chunk(e, start, end);
1382}
1383
1384int owl_editwin_get_echochar(owl_editwin *e)
1385{
1386  return e->echochar;
1387}
1388
1389static CALLER_OWN char *oe_chunk(owl_editwin *e, int start, int end)
1390{
1391  char *p;
1392 
1393  p = g_new(char, end - start + 1);
1394  memcpy(p, e->buff + start, end - start);
1395  p[end - start] = 0;
1396
1397  return p;
1398}
1399
1400/*
1401 * The only guarantee made about these values is that comparisons
1402 * between them, as well as comparison between multiple calls to these
1403 * functions without modifying the editwin in-between, are meaningful.
1404 */
1405
1406int owl_editwin_get_point(owl_editwin *e)
1407{
1408  return e->index;
1409}
1410
1411int owl_editwin_get_mark(owl_editwin *e)
1412{
1413  return e->mark;
1414}
1415
1416static void oe_dirty(owl_editwin *e)
1417{
1418  if (e->win) owl_window_dirty(e->win);
1419}
1420
1421
1422/*
1423 * Local Variables:
1424 * mode:C
1425 * c-basic-offset:2
1426 * End:
1427 */
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