source: editwin.c @ a88f35a

release-1.4release-1.5release-1.6release-1.7release-1.8release-1.9
Last change on this file since a88f35a was a88f35a, checked in by Nelson Elhage <nelhage@mit.edu>, 12 years ago
Give perl code more rope with respect to the editwin. In particular, implement save_excursion and replace_region.
  • Property mode set to 100644
File size: 30.3 KB
Line 
1#include "owl.h"
2#include <stdlib.h>
3#include <unistd.h>
4#include <string.h>
5#include <ctype.h>
6
7static const char fileIdent[] = "$Id$";
8
9#define VALID_EXCURSION (0x9a2b4729)
10
11typedef struct _owl_editwin_excursion { /*noproto*/
12  int valid;
13  int index;
14  int mark;
15  int goal_column;
16  int lock;
17  struct _owl_editwin_excursion *next;
18} oe_excursion;
19
20struct _owl_editwin { /*noproto*/
21  char *buff;
22  owl_history *hist;
23  int bufflen;
24  int allocated;
25  int index;
26  int mark;
27  char *killbuf;
28  int goal_column;
29  int topindex;
30  int cursorx;
31  int winlines, wincols, fillcol, wrapcol;
32  WINDOW *curswin;
33  int style;
34  int lock;
35  int dotsend;
36  int echochar;
37  oe_excursion *excursions;
38
39  char *command;
40  void (*callback)(struct _owl_editwin*);
41  void *cbdata;
42};
43
44static void oe_reframe(owl_editwin *e);
45static void oe_save_excursion(owl_editwin *e, oe_excursion *x);
46static void oe_release_excursion(owl_editwin *e, oe_excursion *x);
47static void oe_restore_excursion(owl_editwin *e, oe_excursion *x);
48static void oe_restore_mark_only(owl_editwin *e, oe_excursion *x);
49static int oe_count_glyphs(char *s);
50static int oe_char_width(gunichar c, int column);
51static int oe_region_width(owl_editwin *e, int start, int end, int width);
52static int oe_find_display_line(owl_editwin *e, int *x, int index);
53static void oe_insert_char(owl_editwin *e, gunichar c);
54static int owl_editwin_limit_maxcols(int v, int maxv);
55static int owl_editwin_check_dotsend(owl_editwin *e);
56static int owl_editwin_is_char_in(owl_editwin *e, char *set);
57static gunichar owl_editwin_get_char_at_point(owl_editwin *e);
58static int owl_editwin_replace_internal(owl_editwin *e, int replace, char *s);
59static char *oe_copy_buf(owl_editwin *e, char *buf, int len);
60static int oe_copy_region(owl_editwin *e);
61static int oe_display_column(owl_editwin *e);
62static char *oe_chunk(owl_editwin *e, int start, int end);
63
64#define INCR 4096
65
66#define WHITESPACE " \n\t"
67
68owl_editwin *owl_editwin_allocate(void)
69{
70  owl_editwin *e;
71  e = owl_malloc(sizeof(owl_editwin));
72  memset(e, 0, sizeof(*e));
73  return e;
74}
75
76static int oe_count_glyphs(char *s)
77{
78  int count = 0;
79  char *p;
80
81  for(p = s; *p != 0; p = g_utf8_find_next_char(p, NULL))
82    if (!g_unichar_ismark(g_utf8_get_char(p)))
83      count++;
84
85  return count;
86}
87
88static inline void oe_set_index(owl_editwin *e, int index)
89{
90  if (index != e->index) {
91    e->goal_column = -1;
92    e->cursorx = -1;
93  }
94  e->index = index;
95}
96
97static inline void oe_set_mark(owl_editwin *e, int mark)
98{
99  e->mark = mark;
100}
101
102void owl_editwin_set_mark(owl_editwin *e)
103{
104  oe_set_mark(e, e->index);
105  /* owl_function_makemsg("Mark set."); */
106}
107
108/* initialize the editwin e.
109 * 'win' is an already initialzed curses window that will be used by editwin
110 */
111void owl_editwin_init(owl_editwin *e, WINDOW *win, int winlines, int wincols, int style, owl_history *hist)
112{
113  e->buff=owl_malloc(INCR);
114  e->buff[0]='\0';
115  e->bufflen=0;
116  e->hist=hist;
117  e->allocated=INCR;
118  oe_set_index(e, 0);
119  oe_set_mark(e, -1);
120  if (e->killbuf != NULL)
121    free(e->killbuf);
122  e->killbuf = NULL;
123  e->goal_column = -1;
124  e->cursorx = -1;
125  e->topindex = 0;
126  e->excursions = NULL;
127  owl_editwin_set_curswin(e, win, winlines, wincols);
128  e->style=style;
129  if ((style!=OWL_EDITWIN_STYLE_MULTILINE) &&
130      (style!=OWL_EDITWIN_STYLE_ONELINE)) {
131    e->style=OWL_EDITWIN_STYLE_MULTILINE;
132  }
133  e->lock=0;
134  e->dotsend=0;
135  e->echochar='\0';
136
137  /* We get initialized multiple times, but we need to hold on to
138     the callbacks, so we can't NULL them here. */
139  /*
140    e->command = NULL;
141    e->callback = NULL;
142    e->cbdata = NULL;
143  */
144  if (win) werase(win);
145}
146
147void owl_editwin_set_curswin(owl_editwin *e, WINDOW *w, int winlines, int wincols)
148{
149  e->curswin=w;
150  e->winlines=winlines;
151  e->wincols=wincols;
152  e->fillcol=owl_editwin_limit_maxcols(wincols-7, owl_global_get_edit_maxfillcols(&g));
153  e->wrapcol=owl_editwin_limit_maxcols(wincols-7, owl_global_get_edit_maxwrapcols(&g));
154}
155
156/* echo the character 'ch' for each normal character keystroke,
157 * excepting locktext.  This is useful for entering passwords etc.  If
158 * ch=='\0' characters are echo'd normally
159 */
160void owl_editwin_set_echochar(owl_editwin *e, int ch)
161{
162  e->echochar=ch;
163}
164
165WINDOW *owl_editwin_get_curswin(owl_editwin *e)
166{
167  return(e->curswin);
168}
169
170owl_history *owl_editwin_get_history(owl_editwin *e)
171{
172  return(e->hist);
173}
174
175void owl_editwin_set_dotsend(owl_editwin *e)
176{
177  e->dotsend=1;
178}
179
180void owl_editwin_set_command(owl_editwin *e, char *command)
181{
182  if(e->command) owl_free(e->command);
183  e->command = owl_strdup(command);
184}
185
186char *owl_editwin_get_command(owl_editwin *e)
187{
188  if(e->command) return e->command;
189  return "";
190}
191
192void owl_editwin_set_callback(owl_editwin *e, void (*cb)(owl_editwin*))
193{
194  e->callback = cb;
195}
196
197void (*owl_editwin_get_callback(owl_editwin *e))(owl_editwin*)
198{
199  return e->callback;
200}
201
202void owl_editwin_set_cbdata(owl_editwin *e, void *data)
203{
204  e->cbdata = data;
205}
206
207void *owl_editwin_get_cbdata(owl_editwin *e) {
208  return e->cbdata;
209}
210
211void owl_editwin_do_callback(owl_editwin *e) {
212  void (*cb)(owl_editwin*);
213  cb=owl_editwin_get_callback(e);
214  if(!cb) {
215    owl_function_error("Internal error: No editwin callback!");
216  } else {
217    /* owl_function_error("text: |%s|", owl_editwin_get_text(e)); */
218    cb(e);
219  }
220}
221
222static int owl_editwin_limit_maxcols(int v, int maxv)
223{
224  /* maxv > 5 ? MAX(v, vax) : v */
225  if (maxv > 5 && v > maxv) {
226    return(maxv);
227  } else {
228    return(v);
229  }
230}
231
232/* set text to be 'locked in' at the beginning of the buffer, any
233 * previous text (including locked text) will be overwritten
234 */
235void owl_editwin_set_locktext(owl_editwin *e, char *text)
236{
237  oe_set_index(e, 0);
238  e->lock = 0;
239  owl_editwin_replace(e, e->bufflen, text);
240  e->buff[e->bufflen] = 0;
241  e->lock=e->bufflen;
242  oe_set_index(e, e->lock);
243  owl_editwin_redisplay(e, 0);
244}
245
246int owl_editwin_get_style(owl_editwin *e)
247{
248  return(e->style);
249}
250
251void owl_editwin_new_style(owl_editwin *e, int newstyle, owl_history *h)
252{
253  e->hist = h;
254
255  if (e->style==newstyle) return;
256
257  if (newstyle==OWL_EDITWIN_STYLE_MULTILINE) {
258    e->style=newstyle;
259  } else if (newstyle==OWL_EDITWIN_STYLE_ONELINE) {
260    e->style=newstyle;
261
262    /* nuke everything after the first line */
263    owl_editwin_move_to_top(e);
264    owl_editwin_move_to_end_of_line(e);
265    owl_editwin_replace(e, oe_count_glyphs(e->buff + e->index),  "");
266  }
267}
268
269/* completly reinitialize the buffer */
270void owl_editwin_fullclear(owl_editwin *e)
271{
272  owl_free(e->buff);
273  owl_editwin_init(e, e->curswin, e->winlines, e->wincols, e->style, e->hist);
274}
275
276/* clear all text except for locktext and put the cursor at the
277 * beginning
278 */
279void owl_editwin_clear(owl_editwin *e)
280{
281
282  int lock = e->lock;
283  int dotsend=e->dotsend;
284  char *locktext=NULL;
285  char echochar=e->echochar;
286
287  if (lock > 0) {
288    locktext = owl_malloc(lock+1);
289    strncpy(locktext, e->buff, lock);
290    locktext[lock] = 0;
291  }
292
293  owl_free(e->buff);
294  owl_editwin_init(e, e->curswin, e->winlines, e->wincols, e->style, e->hist);
295
296  if (lock > 0) {
297    owl_editwin_set_locktext(e, locktext);
298  }
299  if (dotsend) {
300    owl_editwin_set_dotsend(e);
301  }
302  if (echochar) {
303    owl_editwin_set_echochar(e, echochar);
304  }
305
306  if (locktext)
307    owl_free(locktext);
308
309  oe_set_index(e, lock);
310}
311
312void owl_editwin_recenter(owl_editwin *e)
313{
314  e->topindex = -1;
315}
316
317static void oe_save_excursion(owl_editwin *e, oe_excursion *x)
318{
319  x->index = e->index;
320  x->mark = e->mark;
321  x->goal_column = e->goal_column;
322  x->lock = e->lock;
323
324  x->valid = VALID_EXCURSION;
325  x->next = e->excursions;
326  e->excursions = x;
327}
328
329static void oe_release_excursion(owl_editwin *e, oe_excursion *x)
330{
331  oe_excursion *p;
332
333  x->valid = 0;
334  if (e->excursions == NULL)
335    /* XXX huh. */ ;
336  else if (e->excursions == x)
337    e->excursions = x->next;
338  else {
339    for (p = e->excursions; p->next != NULL; p = p->next)
340      if (p->next == x) {
341        p->next = p->next->next;
342        break;
343      }
344    /* and if we ran off the end? XXX */
345  }
346}
347
348static void oe_restore_excursion(owl_editwin *e, oe_excursion *x)
349{
350  if (x->valid == VALID_EXCURSION) {
351    oe_set_index(e, x->index);
352    e->goal_column = x->goal_column;
353    e->mark = x->mark;
354    e->lock = x->lock;
355
356    oe_release_excursion(e, x);
357  }
358}
359
360static void oe_restore_mark_only(owl_editwin *e, oe_excursion *x)
361{
362  if (x->valid == VALID_EXCURSION) {
363    e->mark = x->mark;
364
365    oe_release_excursion(e, x);
366  }
367}
368
369/* External interface to oe_save_excursion */
370owl_editwin_excursion *owl_editwin_begin_excursion(owl_editwin *e)
371{
372  owl_editwin_excursion *x = owl_malloc(sizeof *x);
373  oe_save_excursion(e, x);
374  return x;
375}
376
377void owl_editwin_end_excursion(owl_editwin *e, owl_editwin_excursion *x)
378{
379  oe_restore_excursion(e, x);
380  owl_free(x);
381}
382
383static inline char *oe_next_point(owl_editwin *e, char *p)
384{
385  char *boundary = e->buff + e->bufflen + 1;
386  char *q;
387
388  q = g_utf8_find_next_char(p, boundary);
389  while (q && g_unichar_ismark(g_utf8_get_char(q)))
390    q = g_utf8_find_next_char(q, boundary);
391
392  if (q == p)
393    return NULL;
394  return q;
395}
396
397static inline char *oe_prev_point(owl_editwin *e, char *p)
398{
399  char *boundary = e->buff + e->lock;
400
401  p = g_utf8_find_prev_char(boundary, p);
402  while (p && g_unichar_ismark(g_utf8_get_char(p)))
403    p = g_utf8_find_prev_char(boundary, p);
404
405  return p;
406}
407
408static int oe_char_width(gunichar c, int column)
409{
410  int cw;
411
412  if (c == 9) /* TAB */
413    return TABSIZE - column % TABSIZE;
414
415  cw = mk_wcwidth(c);
416
417  if (cw < 0) /* control characters */
418    cw = 0;
419
420  return cw;
421}
422
423static int oe_find_display_line(owl_editwin *e, int *x, int index)
424{
425  int width = 0, cw;
426  gunichar c;
427  char *p;
428
429  while(1) {
430    /* note the position of the dot */
431    if (x != NULL && index == e->index && width < e->wincols)
432      *x = width;
433
434    /* get the current character */
435    c = g_utf8_get_char(e->buff + index);
436
437    /* figure out how wide it is */
438    cw = oe_char_width(c, width);
439
440    if (width + cw > e->wincols) {
441      if (x != NULL && *x == width)
442        *x = -1;
443      break;
444    }
445    width += cw;
446
447    if (c == '\n') {
448      if (width < e->wincols)
449        ++index; /* skip the newline */
450      break;
451    }
452
453    /* find the next character */
454    p = oe_next_point(e, e->buff + index);
455    if (p == NULL) { /* we ran off the end */
456      if (x != NULL && e->index > index)
457        *x = width + 1;
458      break;
459    }
460    index = p - e->buff;
461
462  }
463  return index;
464}
465
466static void oe_reframe(owl_editwin *e) {
467  oe_excursion x;
468  int goal = e->winlines / 2;
469  int index;
470  int count = 0;
471  int point;
472  int n, i;
473  int last;
474
475  oe_save_excursion(e, &x);
476  /* step back line-by-line through the buffer until we have >= goal lines of
477     display text */
478  e->lock = 0; /* we can (must) tread on the locktext */
479
480  point = e->index;
481  last = -1;
482  while (count < goal) {
483    index = e->index;
484    owl_editwin_move_to_beginning_of_line(e);
485    if (last == e->index)
486      break;
487    last = e->index;
488    for (n = 0, i = e->index; i < index; n++)
489      i = oe_find_display_line(e, NULL, i);
490    count += n == 0 ? 1 : n;
491    if (count < goal)
492      owl_editwin_point_move(e, -1);
493  }
494
495  e->topindex = e->index;
496  /* if we overshot, backtrack */
497  for (n = 0; n < (count - goal); n++)
498    e->topindex = oe_find_display_line(e, NULL, e->topindex);
499
500  oe_restore_excursion(e, &x);
501}
502
503static void oe_addnec(owl_editwin *e, int count)
504{
505  int i;
506
507  for (i = 0; i < count; i++)
508    waddch(e->curswin, e->echochar);
509}
510
511static void oe_mvaddnec(owl_editwin *e, int y, int x, int count)
512{
513  wmove(e->curswin, y, x);
514  oe_addnec(e, count);
515}
516
517/* regenerate the text on the curses window */
518/* if update == 1 then do a doupdate(), otherwise do not */
519void owl_editwin_redisplay(owl_editwin *e, int update)
520{
521  int x = -1, y = -1, t;
522  int line, index, lineindex, times = 0;
523
524  do {
525    werase(e->curswin);
526
527    if (e->topindex == -1 || e->index < e->topindex)
528      oe_reframe(e);
529
530    line = 0;
531    index = e->topindex;
532    while(line < e->winlines) {
533      lineindex = index;
534      t = -1;
535      index = oe_find_display_line(e, &t, lineindex);
536      if (x == -1 && t != -1)
537        x = t, y = line;
538      if (index - lineindex) {
539        if (!e->echochar)
540          mvwaddnstr(e->curswin, line, 0,
541                     e->buff + lineindex,
542                     index - lineindex);
543        else {
544          if(lineindex < e->lock) {
545            mvwaddnstr(e->curswin, line, 0,
546                       e->buff + lineindex,
547                       MIN(index - lineindex,
548                           e->lock - lineindex));
549            if (e->lock < index)
550              oe_addnec(e,
551                        oe_region_width(e, e->lock, index,
552                                        oe_region_width(e, lineindex, e->lock, 0)));
553          } else
554            oe_mvaddnec(e, line, 0, oe_region_width(e, line, index, 0));
555        }
556      }
557      line++;
558    }
559    if (x == -1)
560        e->topindex = -1; /* force a reframe */
561    times++;
562  } while(x == -1 && times < 3);
563
564  wmove(e->curswin, y, x);
565  e->cursorx = x;
566
567  wnoutrefresh(e->curswin);
568  if (update == 1)
569    doupdate();
570}
571
572static inline void oe_fixup(int *target, int start, int end, int change) {
573  if (*target > start) {
574    if (*target < end)
575      *target = end;
576    else
577      *target += change;
578  }
579}
580
581int owl_editwin_replace_region(owl_editwin *e, char *s)
582{
583  oe_excursion x;
584  oe_save_excursion(e, &x);
585  int ret;
586
587  if(e->index > e->mark) {
588    owl_editwin_exchange_point_and_mark(e);
589  }
590
591  ret = owl_editwin_replace_internal(e, e->mark - e->index, s);
592
593  oe_restore_excursion(e, &x);
594
595  return ret;
596}
597
598/* replace 'replace' characters at the point with s, returning the change in size */
599int owl_editwin_replace(owl_editwin *e, int replace, char *s)
600{
601  int start, end, i;
602  char *p;
603
604  if (!g_utf8_validate(s, -1, NULL)) {
605    owl_function_debugmsg("owl_editwin_insert_string: received non-utf-8 string.");
606    return 0;
607  }
608
609  start = e->index;
610  for (i = 0, p = e->buff + start; i < replace && p != NULL; i++)
611    p = oe_next_point(e, p);
612  if (p != NULL)
613    end = p - e->buff;
614  else
615    end = e->bufflen;
616
617  return owl_editwin_replace_internal(e, end - start, s);
618}
619
620static int owl_editwin_replace_internal(owl_editwin *e, int replace, char *s)
621{
622  int start, end, free, need, size, change;
623  oe_excursion *x;
624  char *p;
625
626  start = e->index;
627  end   = start + replace;
628
629  free = e->allocated - e->bufflen + end - start;
630
631  need = strlen(s) - free;
632  if (need > 0) {
633    size = e->allocated + need + INCR - (need % INCR);
634    p = owl_realloc(e->buff, size);
635    if (p == NULL) {
636      /* XXX signal impending doom somehow and don't do anything */
637      return 0;
638    }
639    e->buff = p;
640    e->allocated = size;
641  }
642
643  memmove(e->buff + start + strlen(s), e->buff + end, e->bufflen + 1 - end);
644  memcpy(e->buff + start, s, strlen(s));
645  change = start - end + strlen(s);
646  e->bufflen += change;
647  e->index += strlen(s);
648
649  /* fix up the mark */
650  oe_fixup(&e->mark, start, end, change);
651  oe_fixup(&e->topindex, start, end, change);
652  /* fix up any saved points after the replaced area */
653  for (x = e->excursions; x != NULL; x = x->next) {
654    oe_fixup(&x->index, start, end, change);
655    oe_fixup(&x->mark, start, end, change);
656  }
657
658  return change;
659}
660
661/* linewrap the word just before the cursor.
662 * returns 0 on success
663 * returns -1 if we could not wrap.
664 */
665static void _owl_editwin_linewrap_word(owl_editwin *e)
666{
667  oe_excursion x;
668  gunichar c;
669
670  oe_save_excursion(e, &x);
671
672  while (owl_editwin_point_move(e, -1)) {
673    c = owl_editwin_get_char_at_point(e);
674    if (owl_util_can_break_after(c) || c == '\n') {
675      if (c != '\n')
676        owl_editwin_replace(e, c != ' ' ? 0 : 1, "\n");
677      break;
678    }
679  }
680
681  oe_restore_excursion(e, &x);
682}
683
684/* delete the character at the current point, following chars
685 * shift left.
686 */
687void owl_editwin_delete_char(owl_editwin *e)
688{
689  owl_editwin_replace(e, 1, "");
690}
691
692/* Swap the character at point with the character at point-1 and
693 * advance the pointer.  If point is at beginning of buffer do
694 * nothing.  If point is after the last character swap point-1 with
695 * point-2.  (Behaves as observed in tcsh and emacs).
696 */
697void owl_editwin_transpose_chars(owl_editwin *e)
698{
699  char *middle, *end, *start, *tmp;
700
701  if (e->bufflen == 0) return;
702
703  if (e->index == e->bufflen)
704    owl_editwin_point_move(e, -1);     /* point is after last character */
705
706  if (owl_editwin_at_beginning_of_buffer(e))
707    return;     /* point is at beginning of buffer, do nothing */
708
709  /* Transpose two utf-8 unicode glyphs. */
710  middle = e->buff + e->index;
711
712  end = oe_next_point(e, middle);
713  if (end == NULL)
714    return;
715
716  start = oe_prev_point(e, middle);
717  if (start == NULL)
718    return;
719
720  tmp = owl_malloc((end - start) + 1);
721  tmp[(end - start)] = 0;
722  memcpy(tmp, middle, end - middle);
723  memcpy(tmp + (end - middle), start, middle - start);
724
725  owl_editwin_point_move(e, -1);
726  owl_editwin_replace(e, 2, tmp);
727}
728
729/* insert 'string' at the current point, later text is shifted
730 * right
731 */
732void owl_editwin_insert_string(owl_editwin *e, char *s)
733{
734  owl_editwin_replace(e, 0, s);
735}
736
737/* We assume index is not set to point to a mid-char */
738static gunichar owl_editwin_get_char_at_point(owl_editwin *e)
739{
740  return g_utf8_get_char(e->buff + e->index);
741}
742
743void owl_editwin_exchange_point_and_mark(owl_editwin *e) {
744  int tmp;
745
746  if (e->mark != -1) {
747    tmp = e->mark;
748    owl_editwin_set_mark(e);
749    oe_set_index(e, tmp);
750  }
751}
752
753int owl_editwin_point_move(owl_editwin *e, int delta)
754{
755  char *p;
756  int change, d = 0;
757
758  change = MAX(delta, - delta);
759  p = e->buff + e->index;
760
761  while (d < change && p != NULL) {
762    if (delta > 0)
763      p = oe_next_point(e, p);
764    else
765      p = oe_prev_point(e, p);
766    if (p != NULL) {
767      oe_set_index(e, p - e->buff);
768      d++;
769    }
770  }
771
772  return delta > 0 ? d : -d;
773}
774
775int owl_editwin_at_beginning_of_buffer(owl_editwin *e) {
776  if (e->index == e->lock)
777    return 1;
778
779  return 0;
780}
781
782int owl_at_end_of_buffer(owl_editwin *e) {
783  if (e->index == e->bufflen)
784    return 1;
785
786  return 0;
787}
788
789int owl_editwin_at_beginning_of_line(owl_editwin *e) /*noproto*/
790{
791  oe_excursion x;
792  int ret;
793
794  if (owl_editwin_at_beginning_of_buffer(e))
795    return 1;
796
797  oe_save_excursion(e, &x);
798  owl_editwin_point_move(e, -1);
799  ret = (owl_editwin_get_char_at_point(e) == '\n');
800  oe_restore_excursion(e, &x);
801
802  return ret;
803}
804
805static int owl_editwin_is_char_in(owl_editwin *e, char *set)
806{
807  char *p;
808
809  for (p = set; *p != 0; p = g_utf8_find_next_char(p, NULL))
810    if (owl_editwin_get_char_at_point(e) == g_utf8_get_char(p))
811      return 1;
812  return 0;
813}
814
815int owl_editwin_move_if_in(owl_editwin *e, int delta, char *set)
816{
817  int change, distance = 0;
818  while (owl_editwin_is_char_in(e, set)) {
819    change = owl_editwin_point_move(e, delta);
820    distance += change;
821    if (change == 0)
822      break;
823  }
824  return distance;
825}
826
827int owl_editwin_move_if_not_in(owl_editwin *e, int delta, char *set)
828{
829  int change, distance = 0;
830  while (!owl_editwin_is_char_in(e, set)) {
831    change = owl_editwin_point_move(e, delta);
832    distance += change;
833    if (change == 0)
834      break;
835  }
836  return distance;
837}
838
839int owl_editwin_move_to_beginning_of_line(owl_editwin *e)
840{
841  int distance = 0;
842
843  if (!owl_editwin_at_beginning_of_line(e)) {
844    /* move off the \n if were at the end of a line */
845    distance += owl_editwin_point_move(e, -1);
846    distance += owl_editwin_move_if_not_in(e, -1, "\n");
847    if (distance && !owl_editwin_at_beginning_of_buffer(e))
848      distance += owl_editwin_point_move(e, 1);
849  }
850  e->goal_column = 0; /* subtleties */
851
852  return distance;
853}
854
855int owl_editwin_move_to_end_of_line(owl_editwin *e)
856{
857  return owl_editwin_move_if_not_in(e, 1, "\n");
858}
859
860int owl_editwin_line_move(owl_editwin *e, int delta)
861{
862  int goal_column, change, ll, distance;
863  int count = 0;
864
865  change = MAX(delta, -delta);
866
867  goal_column = e->goal_column;
868  distance = owl_editwin_move_to_beginning_of_line(e);
869  goal_column = goal_column == -1 ? -distance : goal_column;
870
871  while(count < change) {
872    if (delta > 0) {
873      distance += owl_editwin_move_if_not_in(e, 1, "\n");
874      distance += owl_editwin_point_move(e, 1);
875    } else {
876      /* I really want to assert delta < 0 here */
877      distance += owl_editwin_point_move(e, -1); /* to the newline on
878                                                    the previous line */
879      distance += owl_editwin_move_to_beginning_of_line(e);
880    }
881    count++;
882  }
883
884  distance += (ll = owl_editwin_move_to_end_of_line(e));
885  if (ll > goal_column)
886    distance += owl_editwin_point_move(e, goal_column - ll);
887
888  e->goal_column = goal_column;
889
890  return distance;
891}
892
893void owl_editwin_backspace(owl_editwin *e)
894{
895  /* delete the char before the current one
896   * and shift later chars left
897   */
898  if(owl_editwin_point_move(e, -1))
899    owl_editwin_delete_char(e);
900}
901
902void owl_editwin_key_up(owl_editwin *e)
903{
904  owl_editwin_line_move(e, -1);
905}
906
907void owl_editwin_key_down(owl_editwin *e)
908{
909  owl_editwin_line_move(e, 1);
910}
911
912void owl_editwin_key_left(owl_editwin *e)
913{
914  owl_editwin_point_move(e, -1);
915}
916
917void owl_editwin_key_right(owl_editwin *e)
918{
919  owl_editwin_point_move(e, 1);
920}
921
922int owl_editwin_forward_word(owl_editwin *e)
923{
924  int distance;
925  /* if we're starting on a space, find the first non-space */
926  distance = owl_editwin_move_if_in(e, 1, WHITESPACE);
927
928  /* now find the end of this word */
929  distance += owl_editwin_move_if_not_in(e, 1, WHITESPACE);
930
931  return distance;
932}
933
934void owl_editwin_move_to_nextword(owl_editwin *e)
935{
936  owl_editwin_forward_word(e);
937}
938
939/* go backwards to the last non-space character
940 */
941int owl_editwin_backward_word(owl_editwin *e)
942{
943  oe_excursion x;
944  int distance = 0;
945  int further = 0;
946  int beginning;
947  /* if in middle of word, beginning of word */
948
949  /* if at beginning of a word, find beginning of previous word */
950
951  if (owl_editwin_is_char_in(e, WHITESPACE)) {
952    /* if in whitespace past end of word, find a word , the find the beginning*/
953    distance += owl_editwin_move_if_in(e, -1, WHITESPACE); /* leaves us on the last
954                                                              character of the word */
955    oe_save_excursion(e, &x);
956    /* are we at the beginning of a word? */
957    owl_editwin_point_move(e, -1);
958    beginning = owl_editwin_is_char_in(e, WHITESPACE);
959    oe_restore_excursion(e, &x);
960    if (beginning)
961      return distance;
962   } else {
963    /* in the middle of the word; */
964    oe_save_excursion(e, &x);
965    further += owl_editwin_point_move(e, -1);
966    if (owl_editwin_is_char_in(e, WHITESPACE)) { /* we were at the beginning */
967      distance += owl_editwin_backward_word(e); /* previous case */
968      oe_release_excursion(e, &x);
969      return distance + further;
970    } else {
971      oe_restore_excursion(e, &x);
972    }
973  }
974  distance += owl_editwin_move_if_not_in(e, -1, WHITESPACE);
975  /* will go past */
976  if (e->index > e->lock)
977    distance += owl_editwin_point_move(e, 1);
978  return distance;
979}
980
981void owl_editwin_move_to_previousword(owl_editwin *e)
982{
983  owl_editwin_backward_word(e);
984}
985
986void owl_editwin_delete_nextword(owl_editwin *e)
987{
988  oe_excursion x;
989
990  oe_save_excursion(e, &x);
991  oe_set_mark(e, e->index);
992  owl_editwin_forward_word(e);
993  owl_editwin_kill_region(e);
994  oe_restore_mark_only(e, &x);
995}
996
997void owl_editwin_delete_previousword(owl_editwin *e)
998{
999  oe_excursion x;
1000
1001  oe_save_excursion(e, &x);
1002  oe_set_mark(e, e->index);
1003  owl_editwin_backward_word(e);
1004  owl_editwin_kill_region(e);
1005  oe_restore_mark_only(e, &x);
1006}
1007
1008void owl_editwin_move_to_line_end(owl_editwin *e)
1009{
1010  owl_editwin_move_to_end_of_line(e);
1011}
1012
1013void owl_editwin_delete_to_endofline(owl_editwin *e)
1014{
1015  oe_excursion x;
1016  int distance;
1017
1018  oe_save_excursion(e, &x);
1019  owl_editwin_set_mark(e);
1020  distance = owl_editwin_move_to_end_of_line(e);
1021  if (distance)
1022    owl_editwin_kill_region(e);
1023  else
1024    owl_editwin_replace(e, 1, "");
1025  oe_restore_excursion(e, &x);
1026}
1027
1028void owl_editwin_yank(owl_editwin *e)
1029{
1030  if (e->killbuf != NULL)
1031    owl_editwin_replace(e, 0, e->killbuf);
1032}
1033
1034static char *oe_copy_buf(owl_editwin *e, char *buf, int len)
1035{
1036  char *p;
1037
1038  p = owl_malloc(len + 1);
1039
1040  if (p != NULL) {
1041    owl_free(e->killbuf);
1042    e->killbuf = p;
1043    memcpy(e->killbuf, buf, len);
1044    e->killbuf[len] = 0;
1045  }
1046
1047  return p;
1048}
1049
1050static int oe_copy_region(owl_editwin *e)
1051{
1052  char *p;
1053  int start, end;
1054
1055  if (e->mark == -1)
1056    return 0;
1057
1058  start = MIN(e->index, e->mark);
1059  end = MAX(e->index, e->mark);
1060
1061  p = oe_copy_buf(e, e->buff + start, end - start);
1062  if (p != NULL)
1063    return end - start;
1064  return 0;
1065}
1066
1067void owl_editwin_copy_region_as_kill(owl_editwin *e)
1068{
1069  oe_copy_region(e);
1070}
1071
1072void owl_editwin_kill_region(owl_editwin *e)
1073{
1074  if (e->index > e->mark)
1075    owl_editwin_exchange_point_and_mark(e);
1076
1077  owl_editwin_replace(e, oe_copy_region(e), "");
1078}
1079
1080void owl_editwin_move_to_line_start(owl_editwin *e)
1081{
1082  owl_editwin_move_to_beginning_of_line(e);
1083}
1084
1085void owl_editwin_move_to_end(owl_editwin *e)
1086{
1087  oe_set_index(e, e->bufflen);
1088}
1089
1090void owl_editwin_move_to_top(owl_editwin *e)
1091{
1092  oe_set_index(e, e->lock);
1093}
1094
1095void owl_editwin_backward_paragraph(owl_editwin *e)
1096{
1097  owl_editwin_point_move(e, -1);
1098  for (; e->index >= e->lock; owl_editwin_point_move(e, -1)) {
1099    if (e->index <= e->lock ||
1100        ((e->buff[e->index] == '\n') && (e->buff[e->index - 1]=='\n')))
1101      break;
1102  }
1103}
1104
1105void owl_editwin_forward_paragraph(owl_editwin *e)
1106{
1107  owl_editwin_point_move(e, 1);
1108  /* scan forward to the start of the next paragraph */
1109  for(; e->index < e->bufflen; owl_editwin_point_move(e, 1)) {
1110    if (e->buff[e->index -1] == '\n' && e->buff[e->index] == '\n')
1111      break;
1112  }
1113}
1114
1115static int oe_display_column(owl_editwin *e)
1116{
1117  oe_excursion x;
1118  int lineindex;
1119
1120  oe_save_excursion(e, &x);
1121  owl_editwin_move_to_beginning_of_line(e);
1122  lineindex = e->index;
1123  oe_restore_excursion(e, &x);
1124  return oe_region_width(e, lineindex, e->index, 0);
1125}
1126
1127void owl_editwin_fill_paragraph(owl_editwin *e)
1128{
1129  oe_excursion x;
1130  gunichar ch;
1131  int sentence;
1132
1133  oe_save_excursion(e, &x);
1134
1135  /* Mark the end of the paragraph */
1136  owl_editwin_forward_paragraph(e);
1137  /* Skip the trailing newline */
1138  owl_editwin_point_move(e, -1);
1139  owl_editwin_set_mark(e);
1140
1141  owl_editwin_backward_paragraph(e);
1142
1143  /* Don't mess with the leading newline */
1144  if (owl_editwin_get_char_at_point(e) == '\n')
1145    owl_editwin_point_move(e, 1);
1146
1147  /*
1148   * First pass: Scan forward replacing all series of spaces with ' '
1149   * (or nothing after CJK ideograms)
1150   */
1151  sentence = 0;
1152  for(;e->index < e->mark; owl_editwin_point_move(e, 1)) {
1153    /* bail if we hit a trailing dot on the buffer */
1154    if (strcmp(e->buff + e->index, "\n.") == 0) {
1155      owl_editwin_set_mark(e);
1156      break;
1157    }
1158
1159    ch = owl_editwin_get_char_at_point(e);
1160
1161    if (owl_util_can_break_after(ch) || ch == '\n') {
1162      if (g_unichar_isspace(ch)) {
1163        owl_editwin_replace(e, 1, " ");
1164      }
1165
1166      if (sentence)
1167        owl_editwin_point_move(e, 1);
1168
1169      while(g_unichar_isspace(owl_editwin_get_char_at_point(e))
1170            && e->index < e->mark) {
1171        owl_editwin_delete_char(e);
1172      }
1173    }
1174
1175    if(ch == '.' || ch == '!' || ch == '?')
1176      sentence = 1;
1177    else
1178      sentence = 0;
1179  }
1180
1181  owl_editwin_backward_paragraph(e);
1182
1183  /* Now go through inserting newlines as needed */
1184  while(e->index < e->mark) {
1185    /* if we've travelled too far, linewrap */
1186    if (oe_display_column(e) >= e->fillcol)
1187      _owl_editwin_linewrap_word(e);
1188    owl_editwin_point_move(e, 1);
1189  }
1190
1191  oe_restore_excursion(e, &x);
1192}
1193
1194/* returns true if only whitespace remains */
1195int owl_editwin_is_at_end(owl_editwin *e)
1196{
1197  return (only_whitespace(e->buff + e->index));
1198}
1199
1200static int owl_editwin_check_dotsend(owl_editwin *e)
1201{
1202  char *p, *p_n, *p_p;
1203  gunichar c;
1204
1205  if (!e->dotsend) return(0);
1206
1207  p = g_utf8_find_prev_char(e->buff, e->buff + e->bufflen);
1208  p_n = g_utf8_find_next_char(p, NULL);
1209  p_p = g_utf8_find_prev_char(e->buff, p);
1210  c = g_utf8_get_char(p);
1211  while (p != NULL) {
1212    if (*p == '.'
1213        && p_p != NULL && (*p_p == '\n' || *p_p == '\r')
1214        && p_n != NULL && (*p_n == '\n' || *p_n == '\r')) {
1215      e->bufflen = p - e->buff;
1216      e->buff[e->bufflen] = '\0';
1217      return(1);
1218    }
1219    if (c != '\0' && !g_unichar_isspace(c)) return(0);
1220    p_n = p;
1221    p = p_p;
1222    c = g_utf8_get_char(p);
1223    p_p = g_utf8_find_prev_char(e->buff, p);
1224  }
1225  return(0);
1226}
1227
1228void owl_editwin_post_process_char(owl_editwin *e, owl_input j)
1229{
1230  /* XXX force a redisplay? */
1231  if ((j.ch==13 || j.ch==10) && owl_editwin_check_dotsend(e)) {
1232    owl_command_editmulti_done(e);
1233    return;
1234  }
1235  owl_editwin_redisplay(e, 0);
1236}
1237
1238static int oe_region_width(owl_editwin *e, int start, int end, int offset)
1239{
1240  char *p;
1241  int width = offset;
1242 
1243  for(p = e->buff + start;
1244      p < e->buff + end;
1245      p = g_utf8_find_next_char(p, NULL))
1246    width += oe_char_width(g_utf8_get_char(p), width);
1247
1248  return width - offset;
1249}
1250
1251static void oe_insert_char(owl_editwin *e, gunichar c)
1252{
1253  oe_excursion x;
1254  char tmp[7];
1255  int replaced = -1;
1256
1257  if (c == '\r') /* translate CRs to NLs */
1258    c = '\n';
1259
1260  if (!g_unichar_iscntrl(c) || c == '\n' || c== '\t' ) {
1261    memset(tmp, 0, 7);
1262
1263    if (c == '\n' && e->style == OWL_EDITWIN_STYLE_ONELINE) {
1264      return;
1265    }
1266
1267    if (e->cursorx != -1 && e->cursorx + oe_char_width(c, e->cursorx) > e->wrapcol) {
1268      /* XXX this is actually wrong:
1269       * + If the line has been been wrapped, we can be past the wrap column but
1270       *   e->cursorx be much smaller.
1271       * + If the user went back and inserted a bunch of stuff in the middle of
1272       *   the line, there may be more than one word past the wrap column.
1273       */
1274      oe_save_excursion(e, &x);
1275
1276      if (c == ' ' || c == '\t') {
1277        owl_editwin_point_move(e, -1);
1278        replaced = -owl_editwin_move_if_in(e, -1, " \t");
1279        if (!replaced) {
1280          c = '\n';
1281          replaced = -1;
1282        }
1283      } else {
1284        while(!owl_editwin_at_beginning_of_line(e)) {
1285          owl_editwin_point_move(e, -1);
1286          if (owl_util_can_break_after(owl_editwin_get_char_at_point(e))) {
1287            replaced = -owl_editwin_move_if_in(e, -1, " \t");
1288            break;
1289          }
1290        }
1291        if (owl_editwin_at_beginning_of_line(e))
1292          replaced = -1;
1293      }
1294      if (replaced && !owl_editwin_at_beginning_of_line(e))
1295        owl_editwin_point_move(e, 1);
1296      if (replaced >= 0) {
1297        owl_editwin_replace(e, replaced, "\n");
1298      }
1299      oe_restore_excursion(e, &x);
1300    }
1301
1302    if (replaced >= 0 && (c == ' ' || c == '\t'))
1303      return; /* our work here is done */
1304
1305    g_unichar_to_utf8(c, tmp);
1306    owl_editwin_replace(e, 0, tmp);
1307  }
1308}
1309
1310void owl_editwin_process_char(owl_editwin *e, owl_input j)
1311{
1312  if (j.ch == ERR)
1313    return;
1314  /* Ignore ncurses control characters. */
1315  if (j.ch < 0x100) {
1316    oe_insert_char(e, j.uch);
1317  }
1318}
1319
1320char *owl_editwin_get_text(owl_editwin *e)
1321{
1322  return(e->buff+e->lock);
1323}
1324
1325int owl_editwin_get_echochar(owl_editwin *e)
1326{
1327  return e->echochar;
1328}
1329
1330static char *oe_chunk(owl_editwin *e, int start, int end)
1331{
1332  char *p;
1333 
1334  p = owl_malloc(end - start + 1);
1335  memcpy(p, e->buff + start, end - start);
1336  p[end - start] = 0;
1337
1338  return p;
1339}
1340
1341char *owl_editwin_text_before_point(owl_editwin *e)
1342{
1343  return oe_chunk(e, e->index < e->lock ? 0 : e->lock, e->index);
1344}
1345
1346char *owl_editwin_text_after_point(owl_editwin *e)
1347{
1348  return oe_chunk(e, e->index, e->bufflen);
1349}
1350
1351
1352/*
1353 * Local Variables:
1354 * mode:C
1355 * c-basic-offset:2
1356 * End:
1357 */
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