source: editwin.c @ 9e86f6f

release-1.8release-1.9
Last change on this file since 9e86f6f was 3b8a563, checked in by David Benjamin <davidben@mit.edu>, 10 years ago
Remove NULL checks before calling g_free g_free handles the NULL check for us.
  • Property mode set to 100644
File size: 32.7 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  int refcount;
20  char *buff;
21  owl_history *hist;
22  int bufflen;
23  int allocated;
24  int index;
25  int mark;
26  int goal_column;
27  int topindex;
28  int column;
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_column(owl_editwin *e, int start, int end, int offset);
53static int oe_region_width(owl_editwin *e, int start, int end, int offset);
54static int oe_find_display_line(owl_editwin *e, int *x, int index, int *hard);
55static void oe_insert_char(owl_editwin *e, gunichar c);
56static int owl_editwin_limit_maxcols(int width, int cols);
57static int owl_editwin_check_dotsend(owl_editwin *e);
58static int owl_editwin_is_char_in(owl_editwin *e, const char *set);
59static gunichar owl_editwin_get_char_at_point(owl_editwin *e);
60static int owl_editwin_replace_internal(owl_editwin *e, int replace, const char *s);
61static const char *oe_copy_buf(owl_editwin *e, const char *buf, int len);
62static int oe_copy_region(owl_editwin *e);
63static char *oe_chunk(owl_editwin *e, int start, int end);
64static void oe_destroy_cbdata(owl_editwin *e);
65static void oe_dirty(owl_editwin *e);
66static void oe_window_resized(owl_window *w, owl_editwin *e);
67
68#define INCR 4096
69
70#define WHITESPACE " \n\t"
71
72static owl_editwin *owl_editwin_allocate(void)
73{
74  owl_editwin *e = g_new0(owl_editwin, 1);
75  e->refcount = 1;
76  return e;
77}
78
79static void _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    g_object_unref(e->win);
85  }
86  g_free(e->buff);
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  g_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->column = -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=g_new(char, 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  e->goal_column = -1;
131  e->column = -1;
132  e->topindex = 0;
133  e->excursions = NULL;
134  e->style=style;
135  if ((style!=OWL_EDITWIN_STYLE_MULTILINE) &&
136      (style!=OWL_EDITWIN_STYLE_ONELINE)) {
137    e->style=OWL_EDITWIN_STYLE_MULTILINE;
138  }
139  e->lock=0;
140  e->dotsend=0;
141  e->echochar='\0';
142}
143
144owl_editwin *owl_editwin_new(owl_window *win, int winlines, int wincols, int style, owl_history *hist)
145{
146  owl_editwin *e = owl_editwin_allocate();
147
148  _owl_editwin_init(e, winlines, wincols, style, hist);
149  oe_set_window(e, win, winlines, wincols);
150  return e;
151}
152
153owl_editwin *owl_editwin_ref(owl_editwin *e)
154{
155  e->refcount++;
156  return e;
157}
158
159void owl_editwin_unref(owl_editwin *e)
160{
161  e->refcount--;
162  if (e->refcount <= 0)
163    _owl_editwin_delete(e);
164}
165
166/* TODO: collapse this window into oe_window_resized. Need to stop
167 * passing winlines and wincols to oe_set_window and get them out of
168 * the owl_window. The tester code will first need to pass in an
169 * owl_window headless or so. */
170static void oe_set_window_size(owl_editwin *e, int winlines, int wincols)
171{
172  e->winlines=winlines;
173  e->wincols=wincols;
174  /* fillcol and wrapcol may have changed. */
175  e->fillcol=owl_editwin_limit_maxcols(wincols-7, owl_global_get_edit_maxfillcols(&g));
176  if (e->style == OWL_EDITWIN_STYLE_MULTILINE)
177    e->wrapcol=owl_editwin_limit_maxcols(wincols-7, owl_global_get_edit_maxwrapcols(&g));
178  else
179    e->wrapcol = 0;
180}
181
182static void oe_window_resized(owl_window *w, owl_editwin *e)
183{
184  int winlines, wincols;
185  owl_window_get_position(w, &winlines, &wincols, NULL, NULL);
186  oe_set_window_size(e, winlines, wincols);
187}
188
189static void oe_set_window(owl_editwin *e, owl_window *w, int winlines, int wincols)
190{
191  e->win=w;
192  oe_set_window_size(e, winlines, wincols);
193  if (e->win) {
194    g_object_ref(e->win);
195    e->repaint_id = g_signal_connect(w, "redraw", G_CALLBACK(oe_redraw), e);
196    e->resized_id = g_signal_connect(w, "resized", G_CALLBACK(oe_window_resized), e);
197    owl_window_dirty(e->win);
198  }
199}
200
201owl_window *owl_editwin_get_window(owl_editwin *e)
202{
203  return e->win;
204}
205
206/* echo the character 'ch' for each normal character keystroke,
207 * excepting locktext.  This is useful for entering passwords etc.  If
208 * ch=='\0' characters are echo'd normally
209 */
210void owl_editwin_set_echochar(owl_editwin *e, int ch)
211{
212  e->echochar=ch;
213  oe_dirty(e);
214}
215
216owl_history *owl_editwin_get_history(owl_editwin *e)
217{
218  return(e->hist);
219}
220
221void owl_editwin_set_dotsend(owl_editwin *e)
222{
223  e->dotsend=1;
224}
225
226void owl_editwin_set_callback(owl_editwin *e, void (*cb)(owl_editwin*))
227{
228  e->callback = cb;
229}
230
231void (*owl_editwin_get_callback(owl_editwin *e))(owl_editwin*)
232{
233  return e->callback;
234}
235
236static void oe_destroy_cbdata(owl_editwin *e) {
237  if (e->destroy_cbdata)
238    e->destroy_cbdata(e->cbdata);
239  e->cbdata = NULL;
240  e->destroy_cbdata = NULL;
241}
242
243void owl_editwin_set_cbdata(owl_editwin *e, void *data, void (*destroy)(void *))
244{
245  oe_destroy_cbdata(e);
246  e->cbdata = data;
247  e->destroy_cbdata = destroy;
248}
249
250void *owl_editwin_get_cbdata(owl_editwin *e) {
251  return e->cbdata;
252}
253
254void owl_editwin_do_callback(owl_editwin *e) {
255  void (*cb)(owl_editwin*);
256  cb=owl_editwin_get_callback(e);
257  if(!cb) {
258    owl_function_error("Internal error: No editwin callback!");
259  } else {
260    /* owl_function_error("text: |%s|", owl_editwin_get_text(e)); */
261    cb(e);
262  }
263}
264
265static int owl_editwin_limit_maxcols(int width, int cols)
266{
267  if (cols == 0)
268    return width;
269  return cols;
270}
271
272/* set text to be 'locked in' at the beginning of the buffer, any
273 * previous text (including locked text) will be overwritten
274 */
275void owl_editwin_set_locktext(owl_editwin *e, const char *text)
276{
277  oe_set_index(e, 0);
278  e->lock = 0;
279  owl_editwin_replace(e, e->bufflen, text);
280  e->buff[e->bufflen] = 0;
281  e->lock=e->bufflen;
282  oe_set_index(e, e->lock);
283  oe_dirty(e);
284}
285
286int owl_editwin_get_style(owl_editwin *e)
287{
288  return(e->style);
289}
290
291/* clear all text except for locktext and put the cursor at the
292 * beginning
293 */
294void owl_editwin_clear(owl_editwin *e)
295{
296
297  int lock = e->lock;
298  int dotsend=e->dotsend;
299  char *locktext=NULL;
300  char echochar=e->echochar;
301
302  if (lock > 0) {
303    locktext = g_strndup(e->buff, lock);
304  }
305
306  g_free(e->buff);
307  _owl_editwin_init(e, e->winlines, e->wincols, e->style, e->hist);
308
309  if (lock > 0) {
310    owl_editwin_set_locktext(e, locktext);
311  }
312  if (dotsend) {
313    owl_editwin_set_dotsend(e);
314  }
315  if (echochar) {
316    owl_editwin_set_echochar(e, echochar);
317  }
318
319  g_free(locktext);
320
321  oe_set_index(e, lock);
322}
323
324void owl_editwin_recenter(owl_editwin *e)
325{
326  e->topindex = -1;
327  oe_dirty(e);
328}
329
330static void oe_save_excursion(owl_editwin *e, oe_excursion *x)
331{
332  x->index = e->index;
333  x->mark = e->mark;
334  x->goal_column = e->goal_column;
335  x->lock = e->lock;
336
337  x->valid = VALID_EXCURSION;
338  x->next = e->excursions;
339  e->excursions = x;
340}
341
342static void oe_release_excursion(owl_editwin *e, oe_excursion *x)
343{
344  oe_excursion **px;
345
346  x->valid = 0;
347  for (px = &e->excursions; *px != NULL; px = &(*px)->next)
348    if (*px == x) {
349      *px = x->next;
350      return;
351    }
352  abort();
353}
354
355static void oe_restore_excursion(owl_editwin *e, oe_excursion *x)
356{
357  if (x->valid == VALID_EXCURSION) {
358    oe_set_index(e, x->index);
359    e->goal_column = x->goal_column;
360    e->mark = x->mark;
361    e->lock = x->lock;
362
363    oe_release_excursion(e, x);
364  }
365}
366
367static void oe_restore_mark_only(owl_editwin *e, oe_excursion *x)
368{
369  if (x->valid == VALID_EXCURSION) {
370    e->mark = x->mark;
371
372    oe_release_excursion(e, x);
373  }
374}
375
376/* External interface to oe_save_excursion */
377owl_editwin_excursion *owl_editwin_begin_excursion(owl_editwin *e)
378{
379  owl_editwin_excursion *x = g_new(owl_editwin_excursion, 1);
380  oe_save_excursion(e, x);
381  return x;
382}
383
384void owl_editwin_end_excursion(owl_editwin *e, owl_editwin_excursion *x)
385{
386  oe_restore_excursion(e, x);
387  g_free(x);
388}
389
390static inline const char *oe_next_point(owl_editwin *e, const char *p)
391{
392  const char *boundary = e->buff + e->bufflen + 1;
393  const char *q;
394
395  q = g_utf8_find_next_char(p, boundary);
396  while (q && g_unichar_ismark(g_utf8_get_char(q)))
397    q = g_utf8_find_next_char(q, boundary);
398
399  if (q == p)
400    return NULL;
401  return q;
402}
403
404static inline const char *oe_prev_point(owl_editwin *e, const char *p)
405{
406  const char *boundary = e->buff + e->lock;
407
408  p = g_utf8_find_prev_char(boundary, p);
409  while (p && g_unichar_ismark(g_utf8_get_char(p)))
410    p = g_utf8_find_prev_char(boundary, p);
411
412  return p;
413}
414
415static int oe_char_width(gunichar c, int column)
416{
417  int cw;
418
419  if (c == 9) /* TAB */
420    return TABSIZE - column % TABSIZE;
421
422  cw = mk_wcwidth(c);
423
424  if (cw < 0) /* control characters */
425    cw = 0;
426
427  return cw;
428}
429
430/* Finds the display line of 'e' starting at the character
431 * 'index'. The index just after the line is returned. Whether the
432 * line ends at a hard break (newline) or soft break (wrapping) is
433 * returned in 'hard'.
434 *
435 * If the point (e->index) is contained in the line, its position is
436 * returned in 'x'.
437 */
438static int oe_find_display_line(owl_editwin *e, int *x, int index, int *hard)
439{
440  int width = 0, cw;
441  gunichar c;
442  const char *p;
443
444  while(1) {
445    /* note the position of the dot */
446    if (x != NULL && index == e->index && width < e->wincols)
447      *x = width;
448
449    /* get the current character */
450    c = g_utf8_get_char(e->buff + index);
451
452    /* figure out how wide it is */
453    cw = oe_char_width(c, width);
454
455    if (width + cw > e->wincols - 1) {
456      if (x != NULL && *x == width)
457        *x = -1;
458      if (hard != NULL) *hard = 0;
459      break;
460    }
461    width += cw;
462
463    if (c == '\n') {
464      if (width < e->wincols)
465        ++index; /* skip the newline */
466      if (hard != NULL) *hard = 1;
467      break;
468    }
469
470    /* find the next character */
471    p = oe_next_point(e, e->buff + index);
472    if (p == NULL) { /* we ran off the end */
473      if (x != NULL && e->index > index)
474        *x = width + 1;
475      if (hard != NULL) *hard = 1;
476      break;
477    }
478    index = p - e->buff;
479
480  }
481  return index;
482}
483
484static void oe_reframe(owl_editwin *e) {
485  oe_excursion x;
486  int goal = 1 + e->winlines / 2;
487  int index;
488  int count = 0;
489  int n, i;
490  int last;
491
492  oe_save_excursion(e, &x);
493  /* step back line-by-line through the buffer until we have >= goal lines of
494     display text */
495  e->lock = 0; /* we can (must) tread on the locktext */
496
497  last = -1;
498  while (count < goal) {
499    index = e->index;
500    owl_editwin_move_to_beginning_of_line(e);
501    if (last == e->index)
502      break;
503    last = e->index;
504    for (n = 0, i = e->index; i < index; n++)
505      i = oe_find_display_line(e, NULL, i, NULL);
506    count += n == 0 ? 1 : n;
507    if (count < goal)
508      owl_editwin_point_move(e, -1);
509  }
510
511  e->topindex = e->index;
512  /* if we overshot, backtrack */
513  for (n = 0; n < (count - goal); n++)
514    e->topindex = oe_find_display_line(e, NULL, e->topindex, NULL);
515
516  oe_restore_excursion(e, &x);
517  oe_dirty(e);
518}
519
520static void oe_addnec(owl_editwin *e, WINDOW *curswin, int count)
521{
522  int i;
523
524  for (i = 0; i < count; i++)
525    waddch(curswin, e->echochar);
526}
527
528static void oe_mvaddnec(owl_editwin *e, WINDOW *curswin, int y, int x, int count)
529{
530  wmove(curswin, y, x);
531  oe_addnec(e, curswin, count);
532}
533
534/* regenerate the text on the curses window */
535static void oe_redraw(owl_window *win, WINDOW *curswin, void *user_data)
536{
537  int x = -1, y = -1, t, hard;
538  int line, index, lineindex, times = 0;
539  owl_editwin *e = user_data;
540
541  do {
542    werase(curswin);
543
544    if (e->topindex == -1 || e->index < e->topindex)
545      oe_reframe(e);
546
547    line = 0;
548    index = e->topindex;
549    while(line < e->winlines) {
550      lineindex = index;
551      t = -1;
552      index = oe_find_display_line(e, &t, lineindex, &hard);
553      if (x == -1 && t != -1)
554        x = t, y = line;
555      if (index - lineindex) {
556        if (!e->echochar)
557          mvwaddnstr(curswin, line, 0,
558                     e->buff + lineindex,
559                     index - lineindex);
560        else {
561          if(lineindex < e->lock) {
562            mvwaddnstr(curswin, line, 0,
563                       e->buff + lineindex,
564                       MIN(index - lineindex,
565                           e->lock - lineindex));
566            if (e->lock < index)
567              oe_addnec(e, curswin,
568                        oe_region_width(e, e->lock, index,
569                                        oe_region_width(e, lineindex, e->lock, 0)));
570          } else
571            oe_mvaddnec(e, curswin, line, 0, oe_region_width(e, lineindex, index, 0));
572        }
573        if (!hard)
574          waddch(curswin, '\\');
575      }
576      line++;
577    }
578    if (x == -1)
579        e->topindex = -1; /* force a reframe */
580    times++;
581  } while(x == -1 && times < 3);
582
583  wmove(curswin, y, x);
584}
585
586static inline void oe_fixup(int *target, int start, int end, int change) {
587  if (*target > start) {
588    if (*target <= end)
589      *target = end + change;
590    else
591      *target += change;
592  }
593}
594
595int owl_editwin_replace_region(owl_editwin *e, const char *s)
596{
597  oe_excursion x;
598  int ret;
599
600  if (e->mark == -1) {
601    owl_function_error("The mark is unset, there is no region to replace.");
602    return 0;
603  }
604
605  oe_save_excursion(e, &x);
606
607  if(e->index > e->mark) {
608    owl_editwin_exchange_point_and_mark(e);
609  }
610
611  ret = owl_editwin_replace_internal(e, e->mark - e->index, s);
612
613  oe_restore_excursion(e, &x);
614
615  return ret;
616}
617
618/* replace 'replace' characters at the point with s, returning the change in size */
619int owl_editwin_replace(owl_editwin *e, int replace, const char *s)
620{
621  int start, end, i;
622  const char *p;
623
624  if (!g_utf8_validate(s, -1, NULL)) {
625    owl_function_debugmsg("owl_editwin_insert_string: received non-utf-8 string.");
626    return 0;
627  }
628
629  start = e->index;
630  for (i = 0, p = e->buff + start; i < replace && p != NULL; i++)
631    p = oe_next_point(e, p);
632  if (p != NULL)
633    end = p - e->buff;
634  else
635    end = e->bufflen;
636
637  return owl_editwin_replace_internal(e, end - start, s);
638}
639
640static int owl_editwin_replace_internal(owl_editwin *e, int replace, const char *s)
641{
642  int start, end, free, need, size, change, oldindex;
643  oe_excursion *x;
644
645  start = e->index;
646  end   = start + replace;
647
648  free = e->allocated - e->bufflen + end - start;
649
650  need = strlen(s) - free;
651  if (need > 0) {
652    size = e->allocated + need + INCR - (need % INCR);
653    e->buff = g_renew(char, e->buff, size);
654    e->allocated = size;
655  }
656
657  memmove(e->buff + start + strlen(s), e->buff + end, e->bufflen + 1 - end);
658  memcpy(e->buff + start, s, strlen(s));
659  change = start - end + strlen(s);
660  e->bufflen += change;
661  oldindex = e->index;
662  e->index += strlen(s);
663  if (e->column != -1)
664    e->column = oe_region_column(e, oldindex, e->index, e->column);
665
666  /* fix up the mark */
667  oe_fixup(&e->mark, start, end, change);
668  oe_fixup(&e->topindex, start, end, change);
669  /* fix up any saved points after the replaced area */
670  for (x = e->excursions; x != NULL; x = x->next) {
671    oe_fixup(&x->index, start, end, change);
672    oe_fixup(&x->mark, start, end, change);
673  }
674
675  /* recenter if needed */
676  if (start <= e->topindex)
677    owl_editwin_recenter(e);
678
679  oe_dirty(e);
680
681  return change;
682}
683
684/* linewrap the word just before the cursor.
685 * returns 0 on success
686 * returns -1 if we could not wrap.
687 */
688static void _owl_editwin_linewrap_word(owl_editwin *e)
689{
690  oe_excursion x;
691  gunichar c;
692
693  oe_save_excursion(e, &x);
694
695  while (owl_editwin_point_move(e, -1)) {
696    c = owl_editwin_get_char_at_point(e);
697    if (owl_util_can_break_after(c) || c == '\n') {
698      if (c != '\n')
699        owl_editwin_replace(e, c != ' ' ? 0 : 1, "\n");
700      break;
701    }
702  }
703
704  oe_restore_excursion(e, &x);
705}
706
707/* delete the character at the current point, following chars
708 * shift left.
709 */
710void owl_editwin_delete_char(owl_editwin *e)
711{
712  owl_editwin_replace(e, 1, "");
713}
714
715/* Swap the character at point with the character at point-1 and
716 * advance the pointer.  If point is at beginning of buffer do
717 * nothing.  If point is after the last character swap point-1 with
718 * point-2.  (Behaves as observed in tcsh and emacs).
719 */
720void owl_editwin_transpose_chars(owl_editwin *e)
721{
722  const char *middle, *end, *start;
723  char *tmp;
724
725  if (e->bufflen == 0) return;
726
727  if (e->index == e->bufflen)
728    owl_editwin_point_move(e, -1);     /* point is after last character */
729
730  if (owl_editwin_at_beginning_of_buffer(e))
731    return;     /* point is at beginning of buffer, do nothing */
732
733  /* Transpose two utf-8 unicode glyphs. */
734  middle = e->buff + e->index;
735
736  end = oe_next_point(e, middle);
737  if (end == NULL)
738    return;
739
740  start = oe_prev_point(e, middle);
741  if (start == NULL)
742    return;
743
744  tmp = g_new(char, (end - start) + 1);
745  tmp[(end - start)] = 0;
746  memcpy(tmp, middle, end - middle);
747  memcpy(tmp + (end - middle), start, middle - start);
748
749  owl_editwin_point_move(e, -1);
750  owl_editwin_replace(e, 2, tmp);
751}
752
753/* insert 'string' at the current point, later text is shifted
754 * right
755 */
756void owl_editwin_insert_string(owl_editwin *e, const char *s)
757{
758  owl_editwin_replace(e, 0, s);
759}
760
761/* We assume index is not set to point to a mid-char */
762static gunichar owl_editwin_get_char_at_point(owl_editwin *e)
763{
764  return g_utf8_get_char(e->buff + e->index);
765}
766
767void owl_editwin_exchange_point_and_mark(owl_editwin *e) {
768  int tmp;
769
770  if (e->mark != -1) {
771    tmp = e->mark;
772    owl_editwin_set_mark(e);
773    oe_set_index(e, tmp);
774  }
775}
776
777int owl_editwin_point_move(owl_editwin *e, int delta)
778{
779  const char *p;
780  int change, d = 0;
781
782  change = MAX(delta, - delta);
783  p = e->buff + e->index;
784
785  while (d < change && p != NULL) {
786    if (delta > 0)
787      p = oe_next_point(e, p);
788    else
789      p = oe_prev_point(e, p);
790    if (p != NULL) {
791      oe_set_index(e, p - e->buff);
792      d++;
793    }
794  }
795
796  return delta > 0 ? d : -d;
797}
798
799int owl_editwin_at_beginning_of_buffer(owl_editwin *e) {
800  if (e->index == e->lock)
801    return 1;
802
803  return 0;
804}
805
806int owl_at_end_of_buffer(owl_editwin *e) {
807  if (e->index == e->bufflen)
808    return 1;
809
810  return 0;
811}
812
813static int owl_editwin_at_beginning_of_line(owl_editwin *e)
814{
815  oe_excursion x;
816  int ret;
817
818  if (owl_editwin_at_beginning_of_buffer(e))
819    return 1;
820
821  oe_save_excursion(e, &x);
822  owl_editwin_point_move(e, -1);
823  ret = (owl_editwin_get_char_at_point(e) == '\n');
824  oe_restore_excursion(e, &x);
825
826  return ret;
827}
828
829static int owl_editwin_is_char_in(owl_editwin *e, const char *set)
830{
831  const char *p;
832
833  for (p = set; *p != 0; p = g_utf8_find_next_char(p, NULL))
834    if (owl_editwin_get_char_at_point(e) == g_utf8_get_char(p))
835      return 1;
836  return 0;
837}
838
839int owl_editwin_move_if_in(owl_editwin *e, int delta, const char *set)
840{
841  int change, distance = 0;
842  while (owl_editwin_is_char_in(e, set)) {
843    change = owl_editwin_point_move(e, delta);
844    distance += change;
845    if (change == 0)
846      break;
847  }
848  return distance;
849}
850
851int owl_editwin_move_if_not_in(owl_editwin *e, int delta, const char *set)
852{
853  int change, distance = 0;
854  while (!owl_editwin_is_char_in(e, set)) {
855    change = owl_editwin_point_move(e, delta);
856    distance += change;
857    if (change == 0)
858      break;
859  }
860  return distance;
861}
862
863int owl_editwin_move_to_beginning_of_line(owl_editwin *e)
864{
865  int distance = 0;
866
867  if (!owl_editwin_at_beginning_of_line(e)) {
868    /* move off the \n if were at the end of a line */
869    distance += owl_editwin_point_move(e, -1);
870    distance += owl_editwin_move_if_not_in(e, -1, "\n");
871    /* If we stopped because we reached a '\n', rather than because we
872     * hit the top of the buffer, move forward from the end of the
873     * previous line to the start of the current. */
874    if (owl_editwin_get_char_at_point(e) == '\n')
875      distance += owl_editwin_point_move(e, 1);
876  }
877  e->goal_column = 0; /* subtleties */
878
879  return distance;
880}
881
882int owl_editwin_move_to_end_of_line(owl_editwin *e)
883{
884  return owl_editwin_move_if_not_in(e, 1, "\n");
885}
886
887int owl_editwin_line_move(owl_editwin *e, int delta)
888{
889  int goal_column, change, ll, distance;
890  int count = 0;
891
892  change = MAX(delta, -delta);
893
894  goal_column = e->goal_column;
895  distance = owl_editwin_move_to_beginning_of_line(e);
896  goal_column = goal_column == -1 ? -distance : goal_column;
897
898  while(count < change) {
899    if (delta > 0) {
900      distance += owl_editwin_move_if_not_in(e, 1, "\n");
901      distance += owl_editwin_point_move(e, 1);
902    } else {
903      /* I really want to assert delta < 0 here */
904      distance += owl_editwin_point_move(e, -1); /* to the newline on
905                                                    the previous line */
906      distance += owl_editwin_move_to_beginning_of_line(e);
907    }
908    count++;
909  }
910
911  distance += (ll = owl_editwin_move_to_end_of_line(e));
912  if (ll > goal_column)
913    distance += owl_editwin_point_move(e, goal_column - ll);
914
915  e->goal_column = goal_column;
916  oe_dirty(e);
917
918  return distance;
919}
920
921void owl_editwin_backspace(owl_editwin *e)
922{
923  /* delete the char before the current one
924   * and shift later chars left
925   */
926  if(owl_editwin_point_move(e, -1))
927    owl_editwin_delete_char(e);
928}
929
930void owl_editwin_key_up(owl_editwin *e)
931{
932  owl_editwin_line_move(e, -1);
933}
934
935void owl_editwin_key_down(owl_editwin *e)
936{
937  owl_editwin_line_move(e, 1);
938}
939
940void owl_editwin_key_left(owl_editwin *e)
941{
942  owl_editwin_point_move(e, -1);
943}
944
945void owl_editwin_key_right(owl_editwin *e)
946{
947  owl_editwin_point_move(e, 1);
948}
949
950int owl_editwin_forward_word(owl_editwin *e)
951{
952  int distance;
953  /* if we're starting on a space, find the first non-space */
954  distance = owl_editwin_move_if_in(e, 1, WHITESPACE);
955
956  /* now find the end of this word */
957  distance += owl_editwin_move_if_not_in(e, 1, WHITESPACE);
958
959  return distance;
960}
961
962void owl_editwin_move_to_nextword(owl_editwin *e)
963{
964  owl_editwin_forward_word(e);
965}
966
967/* go backwards to the last non-space character
968 */
969int owl_editwin_backward_word(owl_editwin *e)
970{
971  oe_excursion x;
972  int distance = 0;
973  int further = 0;
974  int beginning;
975  /* if in middle of word, beginning of word */
976
977  /* if at beginning of a word, find beginning of previous word */
978
979  if (owl_editwin_is_char_in(e, WHITESPACE)) {
980    /* if in whitespace past end of word, find a word , the find the beginning*/
981    distance += owl_editwin_move_if_in(e, -1, WHITESPACE); /* leaves us on the last
982                                                              character of the word */
983    oe_save_excursion(e, &x);
984    /* are we at the beginning of a word? */
985    owl_editwin_point_move(e, -1);
986    beginning = owl_editwin_is_char_in(e, WHITESPACE);
987    oe_restore_excursion(e, &x);
988    if (beginning)
989      return distance;
990   } else {
991    /* in the middle of the word; */
992    oe_save_excursion(e, &x);
993    further += owl_editwin_point_move(e, -1);
994    if (owl_editwin_is_char_in(e, WHITESPACE)) { /* we were at the beginning */
995      distance += owl_editwin_backward_word(e); /* previous case */
996      oe_release_excursion(e, &x);
997      return distance + further;
998    } else {
999      oe_restore_excursion(e, &x);
1000    }
1001  }
1002  distance += owl_editwin_move_if_not_in(e, -1, WHITESPACE);
1003  /* will go past */
1004  if (e->index > e->lock)
1005    distance += owl_editwin_point_move(e, 1);
1006  return distance;
1007}
1008
1009void owl_editwin_move_to_previousword(owl_editwin *e)
1010{
1011  owl_editwin_backward_word(e);
1012}
1013
1014void owl_editwin_delete_nextword(owl_editwin *e)
1015{
1016  oe_excursion x;
1017
1018  oe_save_excursion(e, &x);
1019  oe_set_mark(e, e->index);
1020  owl_editwin_forward_word(e);
1021  owl_editwin_kill_region(e);
1022  oe_restore_mark_only(e, &x);
1023}
1024
1025void owl_editwin_delete_previousword(owl_editwin *e)
1026{
1027  oe_excursion x;
1028
1029  oe_save_excursion(e, &x);
1030  oe_set_mark(e, e->index);
1031  owl_editwin_backward_word(e);
1032  owl_editwin_kill_region(e);
1033  oe_restore_mark_only(e, &x);
1034}
1035
1036void owl_editwin_move_to_line_end(owl_editwin *e)
1037{
1038  owl_editwin_move_to_end_of_line(e);
1039}
1040
1041void owl_editwin_delete_to_endofline(owl_editwin *e)
1042{
1043  oe_excursion x;
1044  int distance;
1045
1046  oe_save_excursion(e, &x);
1047  owl_editwin_set_mark(e);
1048  distance = owl_editwin_move_to_end_of_line(e);
1049  if (distance)
1050    owl_editwin_kill_region(e);
1051  else
1052    owl_editwin_replace(e, 1, "");
1053  oe_restore_excursion(e, &x);
1054}
1055
1056void owl_editwin_yank(owl_editwin *e)
1057{
1058  const char *killbuf = owl_global_get_kill_buffer(&g);
1059
1060  if (killbuf != NULL)
1061    owl_editwin_replace(e, 0, killbuf);
1062}
1063
1064static const char *oe_copy_buf(owl_editwin *e, const char *buf, int len)
1065{
1066  owl_global_set_kill_buffer(&g, buf, len);
1067  return owl_global_get_kill_buffer(&g);
1068}
1069
1070static int oe_copy_region(owl_editwin *e)
1071{
1072  const char *p;
1073  int start, end;
1074
1075  if (e->mark == -1)
1076    return 0;
1077
1078  start = MIN(e->index, e->mark);
1079  end = MAX(e->index, e->mark);
1080
1081  p = oe_copy_buf(e, e->buff + start, end - start);
1082  if (p != NULL)
1083    return end - start;
1084  return 0;
1085}
1086
1087void owl_editwin_copy_region_as_kill(owl_editwin *e)
1088{
1089  oe_copy_region(e);
1090}
1091
1092void owl_editwin_kill_region(owl_editwin *e)
1093{
1094  if (e->index > e->mark)
1095    owl_editwin_exchange_point_and_mark(e);
1096
1097  owl_editwin_replace_internal(e, oe_copy_region(e), "");
1098}
1099
1100void owl_editwin_move_to_line_start(owl_editwin *e)
1101{
1102  owl_editwin_move_to_beginning_of_line(e);
1103}
1104
1105void owl_editwin_move_to_end(owl_editwin *e)
1106{
1107  oe_set_index(e, e->bufflen);
1108}
1109
1110void owl_editwin_move_to_top(owl_editwin *e)
1111{
1112  oe_set_index(e, e->lock);
1113}
1114
1115void owl_editwin_backward_paragraph(owl_editwin *e)
1116{
1117  owl_editwin_point_move(e, -1);
1118  for (; e->index >= e->lock; owl_editwin_point_move(e, -1)) {
1119    if (e->index <= e->lock ||
1120        ((e->buff[e->index] == '\n') && (e->buff[e->index - 1]=='\n')))
1121      break;
1122  }
1123}
1124
1125void owl_editwin_forward_paragraph(owl_editwin *e)
1126{
1127  owl_editwin_point_move(e, 1);
1128  /* scan forward to the start of the next paragraph */
1129  for(; e->index < e->bufflen; owl_editwin_point_move(e, 1)) {
1130    if (e->buff[e->index -1] == '\n' && e->buff[e->index] == '\n')
1131      break;
1132  }
1133}
1134
1135int owl_editwin_current_column(owl_editwin *e)
1136{
1137  if (e->column == -1) {
1138    oe_excursion x;
1139    int lineindex;
1140
1141    oe_save_excursion(e, &x);
1142    owl_editwin_move_to_beginning_of_line(e);
1143    lineindex = e->index;
1144    oe_restore_excursion(e, &x);
1145    e->column = oe_region_width(e, lineindex, e->index, 0);
1146  }
1147  return e->column;
1148}
1149
1150void owl_editwin_fill_paragraph(owl_editwin *e)
1151{
1152  oe_excursion x;
1153  gunichar ch;
1154  int sentence;
1155
1156  if (e->fillcol < 0)
1157    /* auto-fill disabled */
1158    return;
1159
1160  oe_save_excursion(e, &x);
1161
1162  /* Mark the end of the paragraph */
1163  owl_editwin_forward_paragraph(e);
1164  /* Skip the trailing newline */
1165  owl_editwin_point_move(e, -1);
1166  owl_editwin_set_mark(e);
1167
1168  owl_editwin_backward_paragraph(e);
1169
1170  /* Don't mess with the leading newline */
1171  if (owl_editwin_get_char_at_point(e) == '\n')
1172    owl_editwin_point_move(e, 1);
1173
1174  /*
1175   * First pass: Scan forward replacing all series of spaces with ' '
1176   * (or nothing after CJK ideograms)
1177   */
1178  sentence = 0;
1179  for(;e->index < e->mark; owl_editwin_point_move(e, 1)) {
1180    /* bail if we hit a trailing dot on the buffer */
1181    if (strcmp(e->buff + e->index, "\n.") == 0) {
1182      owl_editwin_set_mark(e);
1183      break;
1184    }
1185
1186    ch = owl_editwin_get_char_at_point(e);
1187
1188    if (owl_util_can_break_after(ch) || ch == '\n') {
1189      if (g_unichar_isspace(ch)) {
1190        owl_editwin_replace(e, 1, " ");
1191      }
1192
1193      if (sentence && g_unichar_isspace(owl_editwin_get_char_at_point(e))
1194          && e->index < e->mark)
1195        owl_editwin_point_move(e, 1);
1196
1197      while(g_unichar_isspace(owl_editwin_get_char_at_point(e))
1198            && e->index < e->mark) {
1199        owl_editwin_delete_char(e);
1200      }
1201    }
1202
1203    if(ch == '.' || ch == '!' || ch == '?')
1204      sentence = 1;
1205    else
1206      sentence = 0;
1207  }
1208
1209  owl_editwin_backward_paragraph(e);
1210
1211  /* Now go through inserting newlines as needed */
1212  while(e->index < e->mark) {
1213    /* if we've travelled too far, linewrap */
1214    if (owl_editwin_current_column(e) >= e->fillcol)
1215      _owl_editwin_linewrap_word(e);
1216    owl_editwin_point_move(e, 1);
1217  }
1218
1219  oe_restore_excursion(e, &x);
1220}
1221
1222/* returns true if only whitespace remains */
1223int owl_editwin_is_at_end(owl_editwin *e)
1224{
1225  return (only_whitespace(e->buff + e->index));
1226}
1227
1228static int owl_editwin_check_dotsend(owl_editwin *e)
1229{
1230  int zdot = 0;
1231  oe_excursion x;
1232
1233  if (!e->dotsend) return(0);
1234  if (!owl_editwin_is_at_end(e)) return (0);
1235
1236  oe_save_excursion(e, &x);
1237
1238  owl_editwin_point_move(e, -3);
1239
1240  if(strncmp(e->buff + e->index, "\n.\n", 3) == 0) {
1241    owl_editwin_point_move(e, 1);
1242    zdot = 1;
1243  } else if(e->index == e->lock &&
1244            strncmp(e->buff + e->index, ".\n", 2) == 0) {
1245    zdot = 1;
1246  }
1247
1248  if(zdot) {
1249    owl_editwin_set_mark(e);
1250    owl_editwin_move_to_end(e);
1251    owl_editwin_replace_region(e, "");
1252  }
1253
1254  oe_restore_excursion(e, &x);
1255
1256  return zdot;
1257}
1258
1259void owl_editwin_post_process_char(owl_editwin *e, owl_input j)
1260{
1261  /* XXX force a redisplay? */
1262  if ((j.ch==13 || j.ch==10) && owl_editwin_check_dotsend(e)) {
1263    owl_command_edit_done(e);
1264    return;
1265  }
1266}
1267
1268static int oe_region_column(owl_editwin *e, int start, int end, int offset)
1269{
1270  const char *p;
1271  int column = offset;
1272
1273  for(p = e->buff + start;
1274      p < e->buff + end;
1275      p = g_utf8_find_next_char(p, NULL)) {
1276    gunichar c = g_utf8_get_char(p);
1277    if (c == '\n')
1278      column = 0;
1279    else
1280      column += oe_char_width(c, column);
1281  }
1282  return column;
1283}
1284
1285static int oe_region_width(owl_editwin *e, int start, int end, int offset)
1286{
1287  const char *p;
1288  int width = offset;
1289 
1290  for(p = e->buff + start;
1291      p < e->buff + end;
1292      p = g_utf8_find_next_char(p, NULL))
1293    width += oe_char_width(g_utf8_get_char(p), width);
1294
1295  return width - offset;
1296}
1297
1298static void oe_insert_char(owl_editwin *e, gunichar c)
1299{
1300  oe_excursion x;
1301  char tmp[7];
1302  int replaced = -1;
1303  int column;
1304
1305  if (c == '\r') /* translate CRs to NLs */
1306    c = '\n';
1307
1308  if (!g_unichar_iscntrl(c) || c == '\n' || c== '\t' ) {
1309    if (c == '\n' && e->style == OWL_EDITWIN_STYLE_ONELINE) {
1310      return;
1311    }
1312
1313    column = owl_editwin_current_column(e);
1314    if (e->wrapcol > 0 && column != -1 &&
1315        column + oe_char_width(c, column) > e->wrapcol) {
1316      /* XXX this is actually wrong:
1317       * + If the user went back and inserted a bunch of stuff in the middle of
1318       *   the line, there may be more than one word past the wrap column.
1319       */
1320      oe_save_excursion(e, &x);
1321
1322      if (c == ' ' || c == '\t') {
1323        owl_editwin_point_move(e, -1);
1324        replaced = -owl_editwin_move_if_in(e, -1, " \t");
1325        if (!replaced) {
1326          c = '\n';
1327          replaced = -1;
1328        }
1329      } else {
1330        while(!owl_editwin_at_beginning_of_line(e)) {
1331          owl_editwin_point_move(e, -1);
1332          if (owl_util_can_break_after(owl_editwin_get_char_at_point(e))) {
1333            replaced = -owl_editwin_move_if_in(e, -1, " \t");
1334            break;
1335          }
1336        }
1337        if (owl_editwin_at_beginning_of_line(e))
1338          replaced = -1;
1339      }
1340      if (replaced && !owl_editwin_at_beginning_of_line(e))
1341        owl_editwin_point_move(e, 1);
1342      if (replaced >= 0) {
1343        owl_editwin_replace(e, replaced, "\n");
1344      }
1345      oe_restore_excursion(e, &x);
1346    }
1347
1348    if (replaced >= 0 && (c == ' ' || c == '\t'))
1349      return; /* our work here is done */
1350
1351    tmp[g_unichar_to_utf8(c, tmp)] = '\0';
1352    owl_editwin_replace(e, 0, tmp);
1353  }
1354}
1355
1356void owl_editwin_process_char(owl_editwin *e, owl_input j)
1357{
1358  if (j.ch == ERR)
1359    return;
1360  /* Ignore ncurses control characters. */
1361  if (j.ch < 0x100) {
1362    oe_insert_char(e, j.uch);
1363  }
1364}
1365
1366const char *owl_editwin_get_text(owl_editwin *e)
1367{
1368  return(e->buff+e->lock);
1369}
1370
1371char *owl_editwin_get_region(owl_editwin *e)
1372{
1373  int start, end;
1374  start = e->index;
1375  end   = e->mark;
1376  if(start > end) {
1377    int tmp = end;
1378    end = start;
1379    start = tmp;
1380  }
1381
1382  return oe_chunk(e, start, end);
1383}
1384
1385int owl_editwin_get_echochar(owl_editwin *e)
1386{
1387  return e->echochar;
1388}
1389
1390static char *oe_chunk(owl_editwin *e, int start, int end)
1391{
1392  char *p;
1393 
1394  p = g_new(char, end - start + 1);
1395  memcpy(p, e->buff + start, end - start);
1396  p[end - start] = 0;
1397
1398  return p;
1399}
1400
1401/*
1402 * The only guarantee made about these values is that comparisons
1403 * between them, as well as comparison between multiple calls to these
1404 * functions without modifying the editwin in-between, are meaningful.
1405 */
1406
1407int owl_editwin_get_point(owl_editwin *e)
1408{
1409  return e->index;
1410}
1411
1412int owl_editwin_get_mark(owl_editwin *e)
1413{
1414  return e->mark;
1415}
1416
1417static void oe_dirty(owl_editwin *e)
1418{
1419  if (e->win) owl_window_dirty(e->win);
1420}
1421
1422
1423/*
1424 * Local Variables:
1425 * mode:C
1426 * c-basic-offset:2
1427 * End:
1428 */
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