source: editwin.c @ 2fc8397

release-1.4release-1.5release-1.6release-1.7release-1.8release-1.9
Last change on this file since 2fc8397 was 2fc8397, checked in by Nelson Elhage <nelhage@mit.edu>, 12 years ago
Implement {forward,backward}-paragraph
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File size: 29.4 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 oe_excursion_struct { /*noproto*/
12  int valid;
13  int index;
14  int mark;
15  int goal_column;
16  int lock;
17  struct oe_excursion_struct *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 char *oe_copy_buf(owl_editwin *e, char *buf, int len);
59static int oe_copy_region(owl_editwin *e);
60static int oe_display_column(owl_editwin *e);
61static char *oe_chunk(owl_editwin *e, int start, int end);
62
63#define INCR 4096
64
65#define WHITESPACE " \n\t"
66
67owl_editwin *owl_editwin_allocate(void)
68{
69  owl_editwin *e;
70  e = owl_malloc(sizeof(owl_editwin));
71  memset(e, 0, sizeof(*e));
72  return e;
73}
74
75static int oe_count_glyphs(char *s)
76{
77  int count = 0;
78  char *p;
79
80  for(p = s; *p != 0; p = g_utf8_find_next_char(p, NULL))
81    if (!g_unichar_ismark(g_utf8_get_char(p)))
82      count++;
83
84  return count;
85}
86
87static inline void oe_set_index(owl_editwin *e, int index)
88{
89  if (index != e->index) {
90    e->goal_column = -1;
91    e->cursorx = -1;
92  }
93  e->index = index;
94}
95
96static inline void oe_set_mark(owl_editwin *e, int mark)
97{
98  e->mark = mark;
99}
100
101void owl_editwin_set_mark(owl_editwin *e)
102{
103  oe_set_mark(e, e->index);
104  /* owl_function_makemsg("Mark set."); */
105}
106
107/* initialize the editwin e.
108 * 'win' is an already initialzed curses window that will be used by editwin
109 */
110void owl_editwin_init(owl_editwin *e, WINDOW *win, int winlines, int wincols, int style, owl_history *hist)
111{
112  e->buff=owl_malloc(INCR);
113  e->buff[0]='\0';
114  e->bufflen=0;
115  e->hist=hist;
116  e->allocated=INCR;
117  oe_set_index(e, 0);
118  oe_set_mark(e, -1);
119  if (e->killbuf != NULL)
120    free(e->killbuf);
121  e->killbuf = NULL;
122  e->goal_column = -1;
123  e->cursorx = -1;
124  e->topindex = 0;
125  e->excursions = NULL;
126  owl_editwin_set_curswin(e, win, winlines, wincols);
127  e->style=style;
128  if ((style!=OWL_EDITWIN_STYLE_MULTILINE) &&
129      (style!=OWL_EDITWIN_STYLE_ONELINE)) {
130    e->style=OWL_EDITWIN_STYLE_MULTILINE;
131  }
132  e->lock=0;
133  e->dotsend=0;
134  e->echochar='\0';
135
136  /* We get initialized multiple times, but we need to hold on to
137     the callbacks, so we can't NULL them here. */
138  /*
139    e->command = NULL;
140    e->callback = NULL;
141    e->cbdata = NULL;
142  */
143  if (win) werase(win);
144}
145
146void owl_editwin_set_curswin(owl_editwin *e, WINDOW *w, int winlines, int wincols)
147{
148  e->curswin=w;
149  e->winlines=winlines;
150  e->wincols=wincols;
151  e->fillcol=owl_editwin_limit_maxcols(wincols-7, owl_global_get_edit_maxfillcols(&g));
152  e->wrapcol=owl_editwin_limit_maxcols(wincols-7, owl_global_get_edit_maxwrapcols(&g));
153}
154
155/* echo the character 'ch' for each normal character keystroke,
156 * excepting locktext.  This is useful for entering passwords etc.  If
157 * ch=='\0' characters are echo'd normally
158 */
159void owl_editwin_set_echochar(owl_editwin *e, int ch)
160{
161  e->echochar=ch;
162}
163
164WINDOW *owl_editwin_get_curswin(owl_editwin *e)
165{
166  return(e->curswin);
167}
168
169owl_history *owl_editwin_get_history(owl_editwin *e)
170{
171  return(e->hist);
172}
173
174void owl_editwin_set_dotsend(owl_editwin *e)
175{
176  e->dotsend=1;
177}
178
179void owl_editwin_set_command(owl_editwin *e, char *command)
180{
181  if(e->command) owl_free(e->command);
182  e->command = owl_strdup(command);
183}
184
185char *owl_editwin_get_command(owl_editwin *e)
186{
187  if(e->command) return e->command;
188  return "";
189}
190
191void owl_editwin_set_callback(owl_editwin *e, void (*cb)(owl_editwin*))
192{
193  e->callback = cb;
194}
195
196void (*owl_editwin_get_callback(owl_editwin *e))(owl_editwin*)
197{
198  return e->callback;
199}
200
201void owl_editwin_set_cbdata(owl_editwin *e, void *data)
202{
203  e->cbdata = data;
204}
205
206void *owl_editwin_get_cbdata(owl_editwin *e) {
207  return e->cbdata;
208}
209
210void owl_editwin_do_callback(owl_editwin *e) {
211  void (*cb)(owl_editwin*);
212  cb=owl_editwin_get_callback(e);
213  if(!cb) {
214    owl_function_error("Internal error: No editwin callback!");
215  } else {
216    /* owl_function_error("text: |%s|", owl_editwin_get_text(e)); */
217    cb(e);
218  }
219}
220
221static int owl_editwin_limit_maxcols(int v, int maxv)
222{
223  /* maxv > 5 ? MAX(v, vax) : v */
224  if (maxv > 5 && v > maxv) {
225    return(maxv);
226  } else {
227    return(v);
228  }
229}
230
231/* set text to be 'locked in' at the beginning of the buffer, any
232 * previous text (including locked text) will be overwritten
233 */
234void owl_editwin_set_locktext(owl_editwin *e, char *text)
235{
236  oe_set_index(e, 0);
237  e->lock = 0;
238  owl_editwin_replace(e, e->bufflen, text);
239  e->buff[e->bufflen] = 0;
240  e->lock=e->bufflen;
241  oe_set_index(e, e->lock);
242  owl_editwin_redisplay(e, 0);
243}
244
245int owl_editwin_get_style(owl_editwin *e)
246{
247  return(e->style);
248}
249
250void owl_editwin_new_style(owl_editwin *e, int newstyle, owl_history *h)
251{
252  e->hist = h;
253
254  if (e->style==newstyle) return;
255
256  if (newstyle==OWL_EDITWIN_STYLE_MULTILINE) {
257    e->style=newstyle;
258  } else if (newstyle==OWL_EDITWIN_STYLE_ONELINE) {
259    e->style=newstyle;
260
261    /* nuke everything after the first line */
262    owl_editwin_move_to_top(e);
263    owl_editwin_move_to_end_of_line(e);
264    owl_editwin_replace(e, oe_count_glyphs(e->buff + e->index),  "");
265  }
266}
267
268/* completly reinitialize the buffer */
269void owl_editwin_fullclear(owl_editwin *e)
270{
271  owl_free(e->buff);
272  owl_editwin_init(e, e->curswin, e->winlines, e->wincols, e->style, e->hist);
273}
274
275/* clear all text except for locktext and put the cursor at the
276 * beginning
277 */
278void owl_editwin_clear(owl_editwin *e)
279{
280
281  int lock = e->lock;
282  int dotsend=e->dotsend;
283  char *locktext=NULL;
284  char echochar=e->echochar;
285
286  if (lock > 0) {
287    locktext = owl_malloc(lock+1);
288    strncpy(locktext, e->buff, lock);
289    locktext[lock] = 0;
290  }
291
292  owl_free(e->buff);
293  owl_editwin_init(e, e->curswin, e->winlines, e->wincols, e->style, e->hist);
294
295  if (lock > 0) {
296    owl_editwin_set_locktext(e, locktext);
297  }
298  if (dotsend) {
299    owl_editwin_set_dotsend(e);
300  }
301  if (echochar) {
302    owl_editwin_set_echochar(e, echochar);
303  }
304
305  if (locktext)
306    owl_free(locktext);
307
308  oe_set_index(e, lock);
309}
310
311void owl_editwin_recenter(owl_editwin *e)
312{
313  e->topindex = -1;
314}
315
316static void oe_save_excursion(owl_editwin *e, oe_excursion *x)
317{
318  x->index = e->index;
319  x->mark = e->mark;
320  x->goal_column = e->goal_column;
321  x->lock = e->lock;
322
323  x->valid = VALID_EXCURSION;
324  x->next = e->excursions;
325  e->excursions = x;
326}
327
328static void oe_release_excursion(owl_editwin *e, oe_excursion *x)
329{
330  oe_excursion *p;
331
332  x->valid = 0;
333  if (e->excursions == NULL)
334    /* XXX huh. */ ;
335  else if (e->excursions == x)
336    e->excursions = x->next;
337  else {
338    for (p = e->excursions; p->next != NULL; p = p->next)
339      if (p->next == x) {
340        p->next = p->next->next;
341        break;
342      }
343    /* and if we ran off the end? XXX */
344  }
345}
346
347static void oe_restore_excursion(owl_editwin *e, oe_excursion *x)
348{
349  if (x->valid == VALID_EXCURSION) {
350    oe_set_index(e, x->index);
351    e->goal_column = x->goal_column;
352    e->mark = x->mark;
353    e->lock = x->lock;
354
355    oe_release_excursion(e, x);
356  }
357}
358
359static void oe_restore_mark_only(owl_editwin *e, oe_excursion *x)
360{
361  if (x->valid == VALID_EXCURSION) {
362    e->mark = x->mark;
363
364    oe_release_excursion(e, x);
365  }
366}
367
368static inline char *oe_next_point(owl_editwin *e, char *p)
369{
370  char *boundary = e->buff + e->bufflen + 1;
371  char *q;
372
373  q = g_utf8_find_next_char(p, boundary);
374  while (q && g_unichar_ismark(g_utf8_get_char(q)))
375    q = g_utf8_find_next_char(q, boundary);
376
377  if (q == p)
378    return NULL;
379  return q;
380}
381
382static inline char *oe_prev_point(owl_editwin *e, char *p)
383{
384  char *boundary = e->buff + e->lock;
385
386  p = g_utf8_find_prev_char(boundary, p);
387  while (p && g_unichar_ismark(g_utf8_get_char(p)))
388    p = g_utf8_find_prev_char(boundary, p);
389
390  return p;
391}
392
393static int oe_char_width(gunichar c, int column)
394{
395  int cw;
396
397  if (c == 9) /* TAB */
398    return TABSIZE - column % TABSIZE;
399
400  cw = mk_wcwidth(c);
401
402  if (cw < 0) /* control characters */
403    cw = 0;
404
405  return cw;
406}
407
408static int oe_find_display_line(owl_editwin *e, int *x, int index)
409{
410  int width = 0, cw;
411  gunichar c;
412  char *p;
413
414  while(1) {
415    /* note the position of the dot */
416    if (x != NULL && index == e->index && width < e->wincols)
417      *x = width;
418
419    /* get the current character */
420    c = g_utf8_get_char(e->buff + index);
421
422    /* figure out how wide it is */
423    cw = oe_char_width(c, width);
424
425    if (width + cw > e->wincols) {
426      if (x != NULL && *x == width)
427        *x = -1;
428      break;
429    }
430    width += cw;
431
432    if (c == '\n') {
433      if (width < e->wincols)
434        ++index; /* skip the newline */
435      break;
436    }
437
438    /* find the next character */
439    p = oe_next_point(e, e->buff + index);
440    if (p == NULL) { /* we ran off the end */
441      if (x != NULL && e->index > index)
442        *x = width + 1;
443      break;
444    }
445    index = p - e->buff;
446
447  }
448  return index;
449}
450
451static void oe_reframe(owl_editwin *e) {
452  oe_excursion x;
453  int goal = e->winlines / 2;
454  int index;
455  int count = 0;
456  int point;
457  int n, i;
458  int last;
459
460  oe_save_excursion(e, &x);
461  /* step back line-by-line through the buffer until we have >= goal lines of
462     display text */
463  e->lock = 0; /* we can (must) tread on the locktext */
464
465  point = e->index;
466  last = -1;
467  while (count < goal) {
468    index = e->index;
469    owl_editwin_move_to_beginning_of_line(e);
470    if (last == e->index)
471      break;
472    last = e->index;
473    for (n = 0, i = e->index; i < index; n++)
474      i = oe_find_display_line(e, NULL, i);
475    count += n == 0 ? 1 : n;
476    if (count < goal)
477      owl_editwin_point_move(e, -1);
478  }
479
480  e->topindex = e->index;
481  /* if we overshot, backtrack */
482  for (n = 0; n < (count - goal); n++)
483    e->topindex = oe_find_display_line(e, NULL, e->topindex);
484
485  oe_restore_excursion(e, &x);
486}
487
488static void oe_addnec(owl_editwin *e, int count)
489{
490  int i;
491
492  for (i = 0; i < count; i++)
493    waddch(e->curswin, e->echochar);
494}
495
496static void oe_mvaddnec(owl_editwin *e, int y, int x, int count)
497{
498  wmove(e->curswin, y, x);
499  oe_addnec(e, count);
500}
501
502/* regenerate the text on the curses window */
503/* if update == 1 then do a doupdate(), otherwise do not */
504void owl_editwin_redisplay(owl_editwin *e, int update)
505{
506  int x = -1, y = -1, t;
507  int line, index, lineindex, times = 0;
508
509  do {
510    werase(e->curswin);
511
512    if (e->topindex == -1 || e->index < e->topindex)
513      oe_reframe(e);
514
515    line = 0;
516    index = e->topindex;
517    while(line < e->winlines) {
518      lineindex = index;
519      t = -1;
520      index = oe_find_display_line(e, &t, lineindex);
521      if (x == -1 && t != -1)
522        x = t, y = line;
523      if (index - lineindex) {
524        if (!e->echochar)
525          mvwaddnstr(e->curswin, line, 0,
526                     e->buff + lineindex,
527                     index - lineindex);
528        else {
529          if(lineindex < e->lock) {
530            mvwaddnstr(e->curswin, line, 0,
531                       e->buff + lineindex,
532                       MIN(index - lineindex,
533                           e->lock - lineindex));
534            if (e->lock < index)
535              oe_addnec(e,
536                        oe_region_width(e, e->lock, index,
537                                        oe_region_width(e, lineindex, e->lock, 0)));
538          } else
539            oe_mvaddnec(e, line, 0, oe_region_width(e, line, index, 0));
540        }
541      }
542      line++;
543    }
544    if (x == -1)
545        e->topindex = -1; /* force a reframe */
546    times++;
547  } while(x == -1 && times < 3);
548
549  wmove(e->curswin, y, x);
550  e->cursorx = x;
551
552  wnoutrefresh(e->curswin);
553  if (update == 1)
554    doupdate();
555}
556
557static inline void oe_fixup(int *target, int start, int end, int change) {
558  if (*target > start) {
559    if (*target < end)
560      *target = end;
561    else
562      *target += change;
563  }
564}
565
566/* replace count characters at the point with s, returning the change in size */
567int owl_editwin_replace(owl_editwin *e, int replace, char *s)
568{
569  int start, end, i, free, need, size, change;
570  char *p;
571  oe_excursion *x;
572
573  if (!g_utf8_validate(s, -1, NULL)) {
574    owl_function_debugmsg("owl_editwin_insert_string: received non-utf-8 string.");
575    return 0;
576  }
577
578  start = e->index;
579  for (i = 0, p = e->buff + start; i < replace && p != NULL; i++)
580    p = oe_next_point(e, p);
581  if (p != NULL)
582    end = p - e->buff;
583  else
584    end = e->bufflen;
585
586  free = e->allocated - e->bufflen + end - start;
587
588  need = strlen(s) - free;
589  if (need > 0) {
590    size = e->allocated + need + INCR - (need % INCR);
591    p = owl_realloc(e->buff, size);
592    if (p == NULL) {
593      /* XXX signal impending doom somehow and don't do anything */
594      return 0;
595    }
596    e->buff = p;
597    e->allocated = size;
598  }
599
600  memmove(e->buff + start + strlen(s), e->buff + end, e->bufflen + 1 - end);
601  memcpy(e->buff + start, s, strlen(s));
602  change = start - end + strlen(s);
603  e->bufflen += change;
604  e->index += strlen(s);
605
606  /* fix up the mark */
607  oe_fixup(&e->mark, start, end, change);
608  oe_fixup(&e->topindex, start, end, change);
609  /* fix up any saved points after the replaced area */
610  for (x = e->excursions; x != NULL; x = x->next) {
611    oe_fixup(&x->index, start, end, change);
612    oe_fixup(&x->mark, start, end, change);
613  }
614
615  return change;
616}
617
618/* linewrap the word just before the cursor.
619 * returns 0 on success
620 * returns -1 if we could not wrap.
621 */
622static void _owl_editwin_linewrap_word(owl_editwin *e)
623{
624  oe_excursion x;
625  gunichar c;
626
627  oe_save_excursion(e, &x);
628
629  while (owl_editwin_point_move(e, -1)) {
630    c = owl_editwin_get_char_at_point(e);
631    if (owl_util_can_break_after(c) || c == '\n') {
632      if (c != '\n')
633        owl_editwin_replace(e, c != ' ' ? 0 : 1, "\n");
634      break;
635    }
636  }
637
638  oe_restore_excursion(e, &x);
639}
640
641/* delete the character at the current point, following chars
642 * shift left.
643 */
644void owl_editwin_delete_char(owl_editwin *e)
645{
646  owl_editwin_replace(e, 1, "");
647}
648
649/* Swap the character at point with the character at point-1 and
650 * advance the pointer.  If point is at beginning of buffer do
651 * nothing.  If point is after the last character swap point-1 with
652 * point-2.  (Behaves as observed in tcsh and emacs).
653 */
654void owl_editwin_transpose_chars(owl_editwin *e)
655{
656  char *middle, *end, *start, *tmp;
657
658  if (e->bufflen == 0) return;
659
660  if (e->index == e->bufflen)
661    owl_editwin_point_move(e, -1);     /* point is after last character */
662
663  if (owl_editwin_at_beginning_of_buffer(e))
664    return;     /* point is at beginning of buffer, do nothing */
665
666  /* Transpose two utf-8 unicode glyphs. */
667  middle = e->buff + e->index;
668
669  end = oe_next_point(e, middle);
670  if (end == NULL)
671    return;
672
673  start = oe_prev_point(e, middle);
674  if (start == NULL)
675    return;
676
677  tmp = owl_malloc((end - start) + 1);
678  tmp[(end - start)] = 0;
679  memcpy(tmp, middle, end - middle);
680  memcpy(tmp + (end - middle), start, middle - start);
681
682  owl_editwin_point_move(e, -1);
683  owl_editwin_replace(e, 2, tmp);
684}
685
686/* insert 'string' at the current point, later text is shifted
687 * right
688 */
689void owl_editwin_insert_string(owl_editwin *e, char *s)
690{
691  owl_editwin_replace(e, 0, s);
692}
693
694/* We assume index is not set to point to a mid-char */
695static gunichar owl_editwin_get_char_at_point(owl_editwin *e)
696{
697  return g_utf8_get_char(e->buff + e->index);
698}
699
700void owl_editwin_exchange_point_and_mark(owl_editwin *e) {
701  int tmp;
702
703  if (e->mark != -1) {
704    tmp = e->mark;
705    owl_editwin_set_mark(e);
706    oe_set_index(e, tmp);
707  }
708}
709
710int owl_editwin_point_move(owl_editwin *e, int delta)
711{
712  char *p;
713  int change, d = 0;
714
715  change = MAX(delta, - delta);
716  p = e->buff + e->index;
717
718  while (d < change && p != NULL) {
719    if (delta > 0)
720      p = oe_next_point(e, p);
721    else
722      p = oe_prev_point(e, p);
723    if (p != NULL) {
724      oe_set_index(e, p - e->buff);
725      d++;
726    }
727  }
728
729  return delta > 0 ? d : -d;
730}
731
732int owl_editwin_at_beginning_of_buffer(owl_editwin *e) {
733  if (e->index == e->lock)
734    return 1;
735
736  return 0;
737}
738
739int owl_at_end_of_buffer(owl_editwin *e) {
740  if (e->index == e->bufflen)
741    return 1;
742
743  return 0;
744}
745
746int owl_editwin_at_beginning_of_line(owl_editwin *e) /*noproto*/
747{
748  oe_excursion x;
749  int ret;
750
751  if (owl_editwin_at_beginning_of_buffer(e))
752    return 1;
753
754  oe_save_excursion(e, &x);
755  owl_editwin_point_move(e, -1);
756  ret = (owl_editwin_get_char_at_point(e) == '\n');
757  oe_restore_excursion(e, &x);
758
759  return ret;
760}
761
762static int owl_editwin_is_char_in(owl_editwin *e, char *set)
763{
764  char *p;
765
766  for (p = set; *p != 0; p = g_utf8_find_next_char(p, NULL))
767    if (owl_editwin_get_char_at_point(e) == g_utf8_get_char(p))
768      return 1;
769  return 0;
770}
771
772int owl_editwin_move_if_in(owl_editwin *e, int delta, char *set)
773{
774  int change, distance = 0;
775  while (owl_editwin_is_char_in(e, set)) {
776    change = owl_editwin_point_move(e, delta);
777    distance += change;
778    if (change == 0)
779      break;
780  }
781  return distance;
782}
783
784int owl_editwin_move_if_not_in(owl_editwin *e, int delta, char *set)
785{
786  int change, distance = 0;
787  while (!owl_editwin_is_char_in(e, set)) {
788    change = owl_editwin_point_move(e, delta);
789    distance += change;
790    if (change == 0)
791      break;
792  }
793  return distance;
794}
795
796int owl_editwin_move_to_beginning_of_line(owl_editwin *e)
797{
798  int distance = 0;
799
800  if (!owl_editwin_at_beginning_of_line(e)) {
801    /* move off the \n if were at the end of a line */
802    distance += owl_editwin_point_move(e, -1);
803    distance += owl_editwin_move_if_not_in(e, -1, "\n");
804    if (distance && !owl_editwin_at_beginning_of_buffer(e))
805      distance += owl_editwin_point_move(e, 1);
806  }
807  e->goal_column = 0; /* subtleties */
808
809  return distance;
810}
811
812int owl_editwin_move_to_end_of_line(owl_editwin *e)
813{
814  return owl_editwin_move_if_not_in(e, 1, "\n");
815}
816
817int owl_editwin_line_move(owl_editwin *e, int delta)
818{
819  int goal_column, change, ll, distance;
820  int count = 0;
821
822  change = MAX(delta, -delta);
823
824  goal_column = e->goal_column;
825  distance = owl_editwin_move_to_beginning_of_line(e);
826  goal_column = goal_column == -1 ? -distance : goal_column;
827
828  while(count < change) {
829    if (delta > 0) {
830      distance += owl_editwin_move_if_not_in(e, 1, "\n");
831      distance += owl_editwin_point_move(e, 1);
832    } else {
833      /* I really want to assert delta < 0 here */
834      distance += owl_editwin_point_move(e, -1); /* to the newline on
835                                                    the previous line */
836      distance += owl_editwin_move_to_beginning_of_line(e);
837    }
838    count++;
839  }
840
841  distance += (ll = owl_editwin_move_to_end_of_line(e));
842  if (ll > goal_column)
843    distance += owl_editwin_point_move(e, goal_column - ll);
844
845  e->goal_column = goal_column;
846
847  return distance;
848}
849
850void owl_editwin_backspace(owl_editwin *e)
851{
852  /* delete the char before the current one
853   * and shift later chars left
854   */
855  if(owl_editwin_point_move(e, -1))
856    owl_editwin_delete_char(e);
857}
858
859void owl_editwin_key_up(owl_editwin *e)
860{
861  owl_editwin_line_move(e, -1);
862}
863
864void owl_editwin_key_down(owl_editwin *e)
865{
866  owl_editwin_line_move(e, 1);
867}
868
869void owl_editwin_key_left(owl_editwin *e)
870{
871  owl_editwin_point_move(e, -1);
872}
873
874void owl_editwin_key_right(owl_editwin *e)
875{
876  owl_editwin_point_move(e, 1);
877}
878
879int owl_editwin_forward_word(owl_editwin *e)
880{
881  int distance;
882  /* if we're starting on a space, find the first non-space */
883  distance = owl_editwin_move_if_in(e, 1, WHITESPACE);
884
885  /* now find the end of this word */
886  distance += owl_editwin_move_if_not_in(e, 1, WHITESPACE);
887
888  return distance;
889}
890
891void owl_editwin_move_to_nextword(owl_editwin *e)
892{
893  owl_editwin_forward_word(e);
894}
895
896/* go backwards to the last non-space character
897 */
898int owl_editwin_backward_word(owl_editwin *e)
899{
900  oe_excursion x;
901  int distance = 0;
902  int further = 0;
903  int beginning;
904  /* if in middle of word, beginning of word */
905
906  /* if at beginning of a word, find beginning of previous word */
907
908  if (owl_editwin_is_char_in(e, WHITESPACE)) {
909    /* if in whitespace past end of word, find a word , the find the beginning*/
910    distance += owl_editwin_move_if_in(e, -1, WHITESPACE); /* leaves us on the last
911                                                              character of the word */
912    oe_save_excursion(e, &x);
913    /* are we at the beginning of a word? */
914    owl_editwin_point_move(e, -1);
915    beginning = owl_editwin_is_char_in(e, WHITESPACE);
916    oe_restore_excursion(e, &x);
917    if (beginning)
918      return distance;
919   } else {
920    /* in the middle of the word; */
921    oe_save_excursion(e, &x);
922    further += owl_editwin_point_move(e, -1);
923    if (owl_editwin_is_char_in(e, WHITESPACE)) { /* we were at the beginning */
924      distance += owl_editwin_backward_word(e); /* previous case */
925      oe_release_excursion(e, &x);
926      return distance + further;
927    } else {
928      oe_restore_excursion(e, &x);
929    }
930  }
931  distance += owl_editwin_move_if_not_in(e, -1, WHITESPACE);
932  /* will go past */
933  if (e->index > e->lock)
934    distance += owl_editwin_point_move(e, 1);
935  return distance;
936}
937
938void owl_editwin_move_to_previousword(owl_editwin *e)
939{
940  owl_editwin_backward_word(e);
941}
942
943void owl_editwin_delete_nextword(owl_editwin *e)
944{
945  oe_excursion x;
946
947  oe_save_excursion(e, &x);
948  oe_set_mark(e, e->index);
949  owl_editwin_forward_word(e);
950  owl_editwin_kill_region(e);
951  oe_restore_mark_only(e, &x);
952}
953
954void owl_editwin_delete_previousword(owl_editwin *e)
955{
956  oe_excursion x;
957
958  oe_save_excursion(e, &x);
959  oe_set_mark(e, e->index);
960  owl_editwin_backward_word(e);
961  owl_editwin_kill_region(e);
962  oe_restore_mark_only(e, &x);
963}
964
965void owl_editwin_move_to_line_end(owl_editwin *e)
966{
967  owl_editwin_move_to_end_of_line(e);
968}
969
970void owl_editwin_delete_to_endofline(owl_editwin *e)
971{
972  oe_excursion x;
973  int distance;
974
975  oe_save_excursion(e, &x);
976  owl_editwin_set_mark(e);
977  distance = owl_editwin_move_to_end_of_line(e);
978  if (distance)
979    owl_editwin_kill_region(e);
980  else
981    owl_editwin_replace(e, 1, "");
982  oe_restore_excursion(e, &x);
983}
984
985void owl_editwin_yank(owl_editwin *e)
986{
987  if (e->killbuf != NULL)
988    owl_editwin_replace(e, 0, e->killbuf);
989}
990
991static char *oe_copy_buf(owl_editwin *e, char *buf, int len)
992{
993  char *p;
994
995  p = owl_malloc(len + 1);
996
997  if (p != NULL) {
998    owl_free(e->killbuf);
999    e->killbuf = p;
1000    memcpy(e->killbuf, buf, len);
1001    e->killbuf[len] = 0;
1002  }
1003
1004  return p;
1005}
1006
1007static int oe_copy_region(owl_editwin *e)
1008{
1009  char *p;
1010  int start, end;
1011
1012  if (e->mark == -1)
1013    return 0;
1014
1015  start = MIN(e->index, e->mark);
1016  end = MAX(e->index, e->mark);
1017
1018  p = oe_copy_buf(e, e->buff + start, end - start);
1019  if (p != NULL)
1020    return end - start;
1021  return 0;
1022}
1023
1024void owl_editwin_copy_region_as_kill(owl_editwin *e)
1025{
1026  oe_copy_region(e);
1027}
1028
1029void owl_editwin_kill_region(owl_editwin *e)
1030{
1031  if (e->index > e->mark)
1032    owl_editwin_exchange_point_and_mark(e);
1033
1034  owl_editwin_replace(e, oe_copy_region(e), "");
1035}
1036
1037void owl_editwin_move_to_line_start(owl_editwin *e)
1038{
1039  owl_editwin_move_to_beginning_of_line(e);
1040}
1041
1042void owl_editwin_move_to_end(owl_editwin *e)
1043{
1044  oe_set_index(e, e->bufflen);
1045}
1046
1047void owl_editwin_move_to_top(owl_editwin *e)
1048{
1049  oe_set_index(e, e->lock);
1050}
1051
1052void owl_editwin_backward_paragraph(owl_editwin *e)
1053{
1054  owl_editwin_point_move(e, -1);
1055  for (; e->index >= e->lock; owl_editwin_point_move(e, -1)) {
1056    if (e->index <= e->lock ||
1057        ((e->buff[e->index] == '\n') && (e->buff[e->index - 1]=='\n')))
1058      break;
1059  }
1060}
1061
1062void owl_editwin_forward_paragraph(owl_editwin *e)
1063{
1064  owl_editwin_point_move(e, 1);
1065  /* scan forward to the start of the next paragraph */
1066  for(; e->index < e->bufflen; owl_editwin_point_move(e, 1)) {
1067    if (e->buff[e->index -1] == '\n' && e->buff[e->index] == '\n')
1068      break;
1069  }
1070}
1071
1072static int oe_display_column(owl_editwin *e)
1073{
1074  oe_excursion x;
1075  int lineindex;
1076
1077  oe_save_excursion(e, &x);
1078  owl_editwin_move_to_beginning_of_line(e);
1079  lineindex = e->index;
1080  oe_restore_excursion(e, &x);
1081  return oe_region_width(e, lineindex, e->index, 0);
1082}
1083
1084void owl_editwin_fill_paragraph(owl_editwin *e)
1085{
1086  oe_excursion x;
1087  gunichar ch;
1088  int sentence;
1089
1090  oe_save_excursion(e, &x);
1091
1092  /* Mark the end of the paragraph */
1093  owl_editwin_forward_paragraph(e);
1094  /* Skip the trailing newline */
1095  owl_editwin_point_move(e, -1);
1096  owl_editwin_set_mark(e);
1097
1098  owl_editwin_backward_paragraph(e);
1099
1100  /* Don't mess with the leading newline */
1101  if (owl_editwin_get_char_at_point(e) == '\n')
1102    owl_editwin_point_move(e, 1);
1103
1104  /*
1105   * First pass: Scan forward replacing all series of spaces with ' '
1106   * (or nothing after CJK ideograms)
1107   */
1108  sentence = 0;
1109  for(;e->index < e->mark; owl_editwin_point_move(e, 1)) {
1110    /* bail if we hit a trailing dot on the buffer */
1111    if (strcmp(e->buff + e->index, "\n.") == 0) {
1112      owl_editwin_set_mark(e);
1113      break;
1114    }
1115
1116    ch = owl_editwin_get_char_at_point(e);
1117
1118    if (owl_util_can_break_after(ch) || ch == '\n') {
1119      if (g_unichar_isspace(ch)) {
1120        owl_editwin_replace(e, 1, " ");
1121      }
1122
1123      if (sentence)
1124        owl_editwin_point_move(e, 1);
1125
1126      while(g_unichar_isspace(owl_editwin_get_char_at_point(e))
1127            && e->index < e->mark) {
1128        owl_editwin_delete_char(e);
1129      }
1130    }
1131
1132    if(ch == '.' || ch == '!' || ch == '?')
1133      sentence = 1;
1134    else
1135      sentence = 0;
1136  }
1137
1138  owl_editwin_backward_paragraph(e);
1139
1140  /* Now go through inserting newlines as needed */
1141  while(e->index < e->mark) {
1142    /* if we've travelled too far, linewrap */
1143    if (oe_display_column(e) >= e->fillcol)
1144      _owl_editwin_linewrap_word(e);
1145    owl_editwin_point_move(e, 1);
1146  }
1147
1148  oe_restore_excursion(e, &x);
1149}
1150
1151/* returns true if only whitespace remains */
1152int owl_editwin_is_at_end(owl_editwin *e)
1153{
1154  return (only_whitespace(e->buff + e->index));
1155}
1156
1157static int owl_editwin_check_dotsend(owl_editwin *e)
1158{
1159  char *p, *p_n, *p_p;
1160  gunichar c;
1161
1162  if (!e->dotsend) return(0);
1163
1164  p = g_utf8_find_prev_char(e->buff, e->buff + e->bufflen);
1165  p_n = g_utf8_find_next_char(p, NULL);
1166  p_p = g_utf8_find_prev_char(e->buff, p);
1167  c = g_utf8_get_char(p);
1168  while (p != NULL) {
1169    if (*p == '.'
1170        && p_p != NULL && (*p_p == '\n' || *p_p == '\r')
1171        && p_n != NULL && (*p_n == '\n' || *p_n == '\r')) {
1172      e->bufflen = p - e->buff;
1173      e->buff[e->bufflen] = '\0';
1174      return(1);
1175    }
1176    if (c != '\0' && !g_unichar_isspace(c)) return(0);
1177    p_n = p;
1178    p = p_p;
1179    c = g_utf8_get_char(p);
1180    p_p = g_utf8_find_prev_char(e->buff, p);
1181  }
1182  return(0);
1183}
1184
1185void owl_editwin_post_process_char(owl_editwin *e, owl_input j)
1186{
1187  /* XXX force a redisplay? */
1188  if ((j.ch==13 || j.ch==10) && owl_editwin_check_dotsend(e)) {
1189    owl_command_editmulti_done(e);
1190    return;
1191  }
1192  owl_editwin_redisplay(e, 0);
1193}
1194
1195static int oe_region_width(owl_editwin *e, int start, int end, int offset)
1196{
1197  char *p;
1198  int width = offset;
1199 
1200  for(p = e->buff + start;
1201      p < e->buff + end;
1202      p = g_utf8_find_next_char(p, NULL))
1203    width += oe_char_width(g_utf8_get_char(p), width);
1204
1205  return width - offset;
1206}
1207
1208static void oe_insert_char(owl_editwin *e, gunichar c)
1209{
1210  oe_excursion x;
1211  char tmp[7];
1212  int replaced = -1;
1213
1214  if (c == '\r') /* translate CRs to NLs */
1215    c = '\n';
1216
1217  if (!g_unichar_iscntrl(c) || c == '\n' || c== '\t' ) {
1218    memset(tmp, 0, 7);
1219
1220    if (c == '\n' && e->style == OWL_EDITWIN_STYLE_ONELINE) {
1221      return;
1222    }
1223
1224    if (e->cursorx != -1 && e->cursorx + oe_char_width(c, e->cursorx) > e->wrapcol) {
1225      /* XXX this is actually wrong:
1226       * + If the line has been been wrapped, we can be past the wrap column but
1227       *   e->cursorx be much smaller.
1228       * + If the user went back and inserted a bunch of stuff in the middle of
1229       *   the line, there may be more than one word past the wrap column.
1230       */
1231      oe_save_excursion(e, &x);
1232
1233      if (c == ' ' || c == '\t') {
1234        owl_editwin_point_move(e, -1);
1235        replaced = -owl_editwin_move_if_in(e, -1, " \t");
1236        if (!replaced) {
1237          c = '\n';
1238          replaced = -1;
1239        }
1240      } else {
1241        while(!owl_editwin_at_beginning_of_line(e)) {
1242          owl_editwin_point_move(e, -1);
1243          if (owl_util_can_break_after(owl_editwin_get_char_at_point(e))) {
1244            replaced = -owl_editwin_move_if_in(e, -1, " \t");
1245            break;
1246          }
1247        }
1248        if (owl_editwin_at_beginning_of_line(e))
1249          replaced = -1;
1250      }
1251      if (replaced && !owl_editwin_at_beginning_of_line(e))
1252        owl_editwin_point_move(e, 1);
1253      if (replaced >= 0) {
1254        owl_editwin_replace(e, replaced, "\n");
1255      }
1256      oe_restore_excursion(e, &x);
1257    }
1258
1259    if (replaced >= 0 && (c == ' ' || c == '\t'))
1260      return; /* our work here is done */
1261
1262    g_unichar_to_utf8(c, tmp);
1263    owl_editwin_replace(e, 0, tmp);
1264  }
1265}
1266
1267void owl_editwin_process_char(owl_editwin *e, owl_input j)
1268{
1269  if (j.ch == ERR)
1270    return;
1271  /* Ignore ncurses control characters. */
1272  if (j.ch < 0x100) {
1273    oe_insert_char(e, j.uch);
1274  }
1275}
1276
1277char *owl_editwin_get_text(owl_editwin *e)
1278{
1279  return(e->buff+e->lock);
1280}
1281
1282int owl_editwin_get_echochar(owl_editwin *e)
1283{
1284  return e->echochar;
1285}
1286
1287static char *oe_chunk(owl_editwin *e, int start, int end)
1288{
1289  char *p;
1290 
1291  p = owl_malloc(end - start + 1);
1292  memcpy(p, e->buff + start, end - start);
1293  p[end - start] = 0;
1294
1295  return p;
1296}
1297
1298char *owl_editwin_text_before_point(owl_editwin *e)
1299{
1300  return oe_chunk(e, e->index < e->lock ? 0 : e->lock, e->index);
1301}
1302
1303char *owl_editwin_text_after_point(owl_editwin *e)
1304{
1305  return oe_chunk(e, e->index, e->bufflen);
1306}
1307
1308
1309/*
1310 * Local Variables:
1311 * mode:C
1312 * c-basic-offset:2
1313 * End:
1314 */
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