source: editwin.c @ 41c9a96

release-1.4release-1.5release-1.6release-1.7release-1.8release-1.9
Last change on this file since 41c9a96 was d43edd2, checked in by Anders Kaseorg <andersk@mit.edu>, 12 years ago
Death to RCS keywords. Signed-off-by: Anders Kaseorg <andersk@mit.edu>
  • 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
7#define VALID_EXCURSION (0x9a2b4729)
8
9typedef struct _owl_editwin_excursion { /*noproto*/
10  int valid;
11  int index;
12  int mark;
13  int goal_column;
14  int lock;
15  struct _owl_editwin_excursion *next;
16} oe_excursion;
17
18struct _owl_editwin { /*noproto*/
19  char *buff;
20  owl_history *hist;
21  int bufflen;
22  int allocated;
23  int index;
24  int mark;
25  char *killbuf;
26  int goal_column;
27  int topindex;
28  int cursorx;
29  int winlines, wincols, fillcol, wrapcol;
30  WINDOW *curswin;
31  int style;
32  int lock;
33  int dotsend;
34  int echochar;
35  oe_excursion *excursions;
36
37  char *command;
38  void (*callback)(struct _owl_editwin*);
39  void *cbdata;
40};
41
42static void oe_reframe(owl_editwin *e);
43static void oe_save_excursion(owl_editwin *e, oe_excursion *x);
44static void oe_release_excursion(owl_editwin *e, oe_excursion *x);
45static void oe_restore_excursion(owl_editwin *e, oe_excursion *x);
46static void oe_restore_mark_only(owl_editwin *e, oe_excursion *x);
47static int oe_count_glyphs(char *s);
48static int oe_char_width(gunichar c, int column);
49static int oe_region_width(owl_editwin *e, int start, int end, int width);
50static int oe_find_display_line(owl_editwin *e, int *x, int index);
51static void oe_insert_char(owl_editwin *e, gunichar c);
52static int owl_editwin_limit_maxcols(int v, int maxv);
53static int owl_editwin_check_dotsend(owl_editwin *e);
54static int owl_editwin_is_char_in(owl_editwin *e, char *set);
55static gunichar owl_editwin_get_char_at_point(owl_editwin *e);
56static int owl_editwin_replace_internal(owl_editwin *e, int replace, char *s);
57static char *oe_copy_buf(owl_editwin *e, char *buf, int len);
58static int oe_copy_region(owl_editwin *e);
59static char *oe_chunk(owl_editwin *e, int start, int end);
60
61#define INCR 4096
62
63#define WHITESPACE " \n\t"
64
65owl_editwin *owl_editwin_allocate(void)
66{
67  owl_editwin *e;
68  e = owl_malloc(sizeof(owl_editwin));
69  memset(e, 0, sizeof(*e));
70  return e;
71}
72
73static int oe_count_glyphs(char *s)
74{
75  int count = 0;
76  char *p;
77
78  for(p = s; *p != 0; p = g_utf8_find_next_char(p, NULL))
79    if (!g_unichar_ismark(g_utf8_get_char(p)))
80      count++;
81
82  return count;
83}
84
85static inline void oe_set_index(owl_editwin *e, int index)
86{
87  if (index != e->index) {
88    e->goal_column = -1;
89    e->cursorx = -1;
90  }
91  e->index = index;
92}
93
94static inline void oe_set_mark(owl_editwin *e, int mark)
95{
96  e->mark = mark;
97}
98
99void owl_editwin_set_mark(owl_editwin *e)
100{
101  oe_set_mark(e, e->index);
102  /* owl_function_makemsg("Mark set."); */
103}
104
105/* initialize the editwin e.
106 * 'win' is an already initialzed curses window that will be used by editwin
107 */
108void owl_editwin_init(owl_editwin *e, WINDOW *win, int winlines, int wincols, int style, owl_history *hist)
109{
110  e->buff=owl_malloc(INCR);
111  e->buff[0]='\0';
112  e->bufflen=0;
113  e->hist=hist;
114  e->allocated=INCR;
115  oe_set_index(e, 0);
116  oe_set_mark(e, -1);
117  if (e->killbuf != NULL)
118    free(e->killbuf);
119  e->killbuf = NULL;
120  e->goal_column = -1;
121  e->cursorx = -1;
122  e->topindex = 0;
123  e->excursions = NULL;
124  owl_editwin_set_curswin(e, win, winlines, wincols);
125  e->style=style;
126  if ((style!=OWL_EDITWIN_STYLE_MULTILINE) &&
127      (style!=OWL_EDITWIN_STYLE_ONELINE)) {
128    e->style=OWL_EDITWIN_STYLE_MULTILINE;
129  }
130  e->lock=0;
131  e->dotsend=0;
132  e->echochar='\0';
133
134  /* We get initialized multiple times, but we need to hold on to
135     the callbacks, so we can't NULL them here. */
136  /*
137    e->command = NULL;
138    e->callback = NULL;
139    e->cbdata = NULL;
140  */
141  if (win) werase(win);
142}
143
144void owl_editwin_set_curswin(owl_editwin *e, WINDOW *w, int winlines, int wincols)
145{
146  e->curswin=w;
147  e->winlines=winlines;
148  e->wincols=wincols;
149  e->fillcol=owl_editwin_limit_maxcols(wincols-7, owl_global_get_edit_maxfillcols(&g));
150  e->wrapcol=owl_editwin_limit_maxcols(wincols-7, owl_global_get_edit_maxwrapcols(&g));
151}
152
153/* echo the character 'ch' for each normal character keystroke,
154 * excepting locktext.  This is useful for entering passwords etc.  If
155 * ch=='\0' characters are echo'd normally
156 */
157void owl_editwin_set_echochar(owl_editwin *e, int ch)
158{
159  e->echochar=ch;
160}
161
162WINDOW *owl_editwin_get_curswin(owl_editwin *e)
163{
164  return(e->curswin);
165}
166
167owl_history *owl_editwin_get_history(owl_editwin *e)
168{
169  return(e->hist);
170}
171
172void owl_editwin_set_dotsend(owl_editwin *e)
173{
174  e->dotsend=1;
175}
176
177void owl_editwin_set_command(owl_editwin *e, char *command)
178{
179  if(e->command) owl_free(e->command);
180  e->command = owl_strdup(command);
181}
182
183char *owl_editwin_get_command(owl_editwin *e)
184{
185  if(e->command) return e->command;
186  return "";
187}
188
189void owl_editwin_set_callback(owl_editwin *e, void (*cb)(owl_editwin*))
190{
191  e->callback = cb;
192}
193
194void (*owl_editwin_get_callback(owl_editwin *e))(owl_editwin*)
195{
196  return e->callback;
197}
198
199void owl_editwin_set_cbdata(owl_editwin *e, void *data)
200{
201  e->cbdata = data;
202}
203
204void *owl_editwin_get_cbdata(owl_editwin *e) {
205  return e->cbdata;
206}
207
208void owl_editwin_do_callback(owl_editwin *e) {
209  void (*cb)(owl_editwin*);
210  cb=owl_editwin_get_callback(e);
211  if(!cb) {
212    owl_function_error("Internal error: No editwin callback!");
213  } else {
214    /* owl_function_error("text: |%s|", owl_editwin_get_text(e)); */
215    cb(e);
216  }
217}
218
219static int owl_editwin_limit_maxcols(int v, int maxv)
220{
221  /* maxv > 5 ? MAX(v, vax) : v */
222  if (maxv > 5 && v > maxv) {
223    return(maxv);
224  } else {
225    return(v);
226  }
227}
228
229/* set text to be 'locked in' at the beginning of the buffer, any
230 * previous text (including locked text) will be overwritten
231 */
232void owl_editwin_set_locktext(owl_editwin *e, char *text)
233{
234  oe_set_index(e, 0);
235  e->lock = 0;
236  owl_editwin_replace(e, e->bufflen, text);
237  e->buff[e->bufflen] = 0;
238  e->lock=e->bufflen;
239  oe_set_index(e, e->lock);
240  owl_editwin_redisplay(e, 0);
241}
242
243int owl_editwin_get_style(owl_editwin *e)
244{
245  return(e->style);
246}
247
248void owl_editwin_new_style(owl_editwin *e, int newstyle, owl_history *h)
249{
250  e->hist = h;
251
252  if (e->style==newstyle) return;
253
254  if (newstyle==OWL_EDITWIN_STYLE_MULTILINE) {
255    e->style=newstyle;
256  } else if (newstyle==OWL_EDITWIN_STYLE_ONELINE) {
257    e->style=newstyle;
258
259    /* nuke everything after the first line */
260    owl_editwin_move_to_top(e);
261    owl_editwin_move_to_end_of_line(e);
262    owl_editwin_replace(e, oe_count_glyphs(e->buff + e->index),  "");
263  }
264}
265
266/* completly reinitialize the buffer */
267void owl_editwin_fullclear(owl_editwin *e)
268{
269  owl_free(e->buff);
270  owl_editwin_init(e, e->curswin, e->winlines, e->wincols, e->style, e->hist);
271}
272
273/* clear all text except for locktext and put the cursor at the
274 * beginning
275 */
276void owl_editwin_clear(owl_editwin *e)
277{
278
279  int lock = e->lock;
280  int dotsend=e->dotsend;
281  char *locktext=NULL;
282  char echochar=e->echochar;
283
284  if (lock > 0) {
285    locktext = owl_malloc(lock+1);
286    strncpy(locktext, e->buff, lock);
287    locktext[lock] = 0;
288  }
289
290  owl_free(e->buff);
291  owl_editwin_init(e, e->curswin, e->winlines, e->wincols, e->style, e->hist);
292
293  if (lock > 0) {
294    owl_editwin_set_locktext(e, locktext);
295  }
296  if (dotsend) {
297    owl_editwin_set_dotsend(e);
298  }
299  if (echochar) {
300    owl_editwin_set_echochar(e, echochar);
301  }
302
303  if (locktext)
304    owl_free(locktext);
305
306  oe_set_index(e, lock);
307}
308
309void owl_editwin_recenter(owl_editwin *e)
310{
311  e->topindex = -1;
312}
313
314static void oe_save_excursion(owl_editwin *e, oe_excursion *x)
315{
316  x->index = e->index;
317  x->mark = e->mark;
318  x->goal_column = e->goal_column;
319  x->lock = e->lock;
320
321  x->valid = VALID_EXCURSION;
322  x->next = e->excursions;
323  e->excursions = x;
324}
325
326static void oe_release_excursion(owl_editwin *e, oe_excursion *x)
327{
328  oe_excursion *p;
329
330  x->valid = 0;
331  if (e->excursions == NULL)
332    /* XXX huh. */ ;
333  else if (e->excursions == x)
334    e->excursions = x->next;
335  else {
336    for (p = e->excursions; p->next != NULL; p = p->next)
337      if (p->next == x) {
338        p->next = p->next->next;
339        break;
340      }
341    /* and if we ran off the end? XXX */
342  }
343}
344
345static void oe_restore_excursion(owl_editwin *e, oe_excursion *x)
346{
347  if (x->valid == VALID_EXCURSION) {
348    oe_set_index(e, x->index);
349    e->goal_column = x->goal_column;
350    e->mark = x->mark;
351    e->lock = x->lock;
352
353    oe_release_excursion(e, x);
354  }
355}
356
357static void oe_restore_mark_only(owl_editwin *e, oe_excursion *x)
358{
359  if (x->valid == VALID_EXCURSION) {
360    e->mark = x->mark;
361
362    oe_release_excursion(e, x);
363  }
364}
365
366/* External interface to oe_save_excursion */
367owl_editwin_excursion *owl_editwin_begin_excursion(owl_editwin *e)
368{
369  owl_editwin_excursion *x = owl_malloc(sizeof *x);
370  oe_save_excursion(e, x);
371  return x;
372}
373
374void owl_editwin_end_excursion(owl_editwin *e, owl_editwin_excursion *x)
375{
376  oe_restore_excursion(e, x);
377  owl_free(x);
378}
379
380static inline char *oe_next_point(owl_editwin *e, char *p)
381{
382  char *boundary = e->buff + e->bufflen + 1;
383  char *q;
384
385  q = g_utf8_find_next_char(p, boundary);
386  while (q && g_unichar_ismark(g_utf8_get_char(q)))
387    q = g_utf8_find_next_char(q, boundary);
388
389  if (q == p)
390    return NULL;
391  return q;
392}
393
394static inline char *oe_prev_point(owl_editwin *e, char *p)
395{
396  char *boundary = e->buff + e->lock;
397
398  p = g_utf8_find_prev_char(boundary, p);
399  while (p && g_unichar_ismark(g_utf8_get_char(p)))
400    p = g_utf8_find_prev_char(boundary, p);
401
402  return p;
403}
404
405static int oe_char_width(gunichar c, int column)
406{
407  int cw;
408
409  if (c == 9) /* TAB */
410    return TABSIZE - column % TABSIZE;
411
412  cw = mk_wcwidth(c);
413
414  if (cw < 0) /* control characters */
415    cw = 0;
416
417  return cw;
418}
419
420static int oe_find_display_line(owl_editwin *e, int *x, int index)
421{
422  int width = 0, cw;
423  gunichar c;
424  char *p;
425
426  while(1) {
427    /* note the position of the dot */
428    if (x != NULL && index == e->index && width < e->wincols)
429      *x = width;
430
431    /* get the current character */
432    c = g_utf8_get_char(e->buff + index);
433
434    /* figure out how wide it is */
435    cw = oe_char_width(c, width);
436
437    if (width + cw > e->wincols) {
438      if (x != NULL && *x == width)
439        *x = -1;
440      break;
441    }
442    width += cw;
443
444    if (c == '\n') {
445      if (width < e->wincols)
446        ++index; /* skip the newline */
447      break;
448    }
449
450    /* find the next character */
451    p = oe_next_point(e, e->buff + index);
452    if (p == NULL) { /* we ran off the end */
453      if (x != NULL && e->index > index)
454        *x = width + 1;
455      break;
456    }
457    index = p - e->buff;
458
459  }
460  return index;
461}
462
463static void oe_reframe(owl_editwin *e) {
464  oe_excursion x;
465  int goal = e->winlines / 2;
466  int index;
467  int count = 0;
468  int point;
469  int n, i;
470  int last;
471
472  oe_save_excursion(e, &x);
473  /* step back line-by-line through the buffer until we have >= goal lines of
474     display text */
475  e->lock = 0; /* we can (must) tread on the locktext */
476
477  point = e->index;
478  last = -1;
479  while (count < goal) {
480    index = e->index;
481    owl_editwin_move_to_beginning_of_line(e);
482    if (last == e->index)
483      break;
484    last = e->index;
485    for (n = 0, i = e->index; i < index; n++)
486      i = oe_find_display_line(e, NULL, i);
487    count += n == 0 ? 1 : n;
488    if (count < goal)
489      owl_editwin_point_move(e, -1);
490  }
491
492  e->topindex = e->index;
493  /* if we overshot, backtrack */
494  for (n = 0; n < (count - goal); n++)
495    e->topindex = oe_find_display_line(e, NULL, e->topindex);
496
497  oe_restore_excursion(e, &x);
498}
499
500static void oe_addnec(owl_editwin *e, int count)
501{
502  int i;
503
504  for (i = 0; i < count; i++)
505    waddch(e->curswin, e->echochar);
506}
507
508static void oe_mvaddnec(owl_editwin *e, int y, int x, int count)
509{
510  wmove(e->curswin, y, x);
511  oe_addnec(e, count);
512}
513
514/* regenerate the text on the curses window */
515/* if update == 1 then do a doupdate(), otherwise do not */
516void owl_editwin_redisplay(owl_editwin *e, int update)
517{
518  int x = -1, y = -1, t;
519  int line, index, lineindex, times = 0;
520
521  do {
522    werase(e->curswin);
523
524    if (e->topindex == -1 || e->index < e->topindex)
525      oe_reframe(e);
526
527    line = 0;
528    index = e->topindex;
529    while(line < e->winlines) {
530      lineindex = index;
531      t = -1;
532      index = oe_find_display_line(e, &t, lineindex);
533      if (x == -1 && t != -1)
534        x = t, y = line;
535      if (index - lineindex) {
536        if (!e->echochar)
537          mvwaddnstr(e->curswin, line, 0,
538                     e->buff + lineindex,
539                     index - lineindex);
540        else {
541          if(lineindex < e->lock) {
542            mvwaddnstr(e->curswin, line, 0,
543                       e->buff + lineindex,
544                       MIN(index - lineindex,
545                           e->lock - lineindex));
546            if (e->lock < index)
547              oe_addnec(e,
548                        oe_region_width(e, e->lock, index,
549                                        oe_region_width(e, lineindex, e->lock, 0)));
550          } else
551            oe_mvaddnec(e, line, 0, oe_region_width(e, line, index, 0));
552        }
553      }
554      line++;
555    }
556    if (x == -1)
557        e->topindex = -1; /* force a reframe */
558    times++;
559  } while(x == -1 && times < 3);
560
561  wmove(e->curswin, y, x);
562  e->cursorx = x;
563
564  wnoutrefresh(e->curswin);
565  if (update == 1)
566    doupdate();
567}
568
569static inline void oe_fixup(int *target, int start, int end, int change) {
570  if (*target > start) {
571    if (*target < end)
572      *target = end;
573    else
574      *target += change;
575  }
576}
577
578int owl_editwin_replace_region(owl_editwin *e, char *s)
579{
580  oe_excursion x;
581  oe_save_excursion(e, &x);
582  int ret;
583
584  if(e->index > e->mark) {
585    owl_editwin_exchange_point_and_mark(e);
586  }
587
588  ret = owl_editwin_replace_internal(e, e->mark - e->index, s);
589
590  oe_restore_excursion(e, &x);
591
592  return ret;
593}
594
595/* replace 'replace' characters at the point with s, returning the change in size */
596int owl_editwin_replace(owl_editwin *e, int replace, char *s)
597{
598  int start, end, i;
599  char *p;
600
601  if (!g_utf8_validate(s, -1, NULL)) {
602    owl_function_debugmsg("owl_editwin_insert_string: received non-utf-8 string.");
603    return 0;
604  }
605
606  start = e->index;
607  for (i = 0, p = e->buff + start; i < replace && p != NULL; i++)
608    p = oe_next_point(e, p);
609  if (p != NULL)
610    end = p - e->buff;
611  else
612    end = e->bufflen;
613
614  return owl_editwin_replace_internal(e, end - start, s);
615}
616
617static int owl_editwin_replace_internal(owl_editwin *e, int replace, char *s)
618{
619  int start, end, free, need, size, change;
620  oe_excursion *x;
621  char *p;
622
623  start = e->index;
624  end   = start + replace;
625
626  free = e->allocated - e->bufflen + end - start;
627
628  need = strlen(s) - free;
629  if (need > 0) {
630    size = e->allocated + need + INCR - (need % INCR);
631    p = owl_realloc(e->buff, size);
632    if (p == NULL) {
633      /* XXX signal impending doom somehow and don't do anything */
634      return 0;
635    }
636    e->buff = p;
637    e->allocated = size;
638  }
639
640  memmove(e->buff + start + strlen(s), e->buff + end, e->bufflen + 1 - end);
641  memcpy(e->buff + start, s, strlen(s));
642  change = start - end + strlen(s);
643  e->bufflen += change;
644  e->index += strlen(s);
645
646  /* fix up the mark */
647  oe_fixup(&e->mark, start, end, change);
648  oe_fixup(&e->topindex, start, end, change);
649  /* fix up any saved points after the replaced area */
650  for (x = e->excursions; x != NULL; x = x->next) {
651    oe_fixup(&x->index, start, end, change);
652    oe_fixup(&x->mark, start, end, change);
653  }
654
655  return change;
656}
657
658/* linewrap the word just before the cursor.
659 * returns 0 on success
660 * returns -1 if we could not wrap.
661 */
662static void _owl_editwin_linewrap_word(owl_editwin *e)
663{
664  oe_excursion x;
665  gunichar c;
666
667  oe_save_excursion(e, &x);
668
669  while (owl_editwin_point_move(e, -1)) {
670    c = owl_editwin_get_char_at_point(e);
671    if (owl_util_can_break_after(c) || c == '\n') {
672      if (c != '\n')
673        owl_editwin_replace(e, c != ' ' ? 0 : 1, "\n");
674      break;
675    }
676  }
677
678  oe_restore_excursion(e, &x);
679}
680
681/* delete the character at the current point, following chars
682 * shift left.
683 */
684void owl_editwin_delete_char(owl_editwin *e)
685{
686  owl_editwin_replace(e, 1, "");
687}
688
689/* Swap the character at point with the character at point-1 and
690 * advance the pointer.  If point is at beginning of buffer do
691 * nothing.  If point is after the last character swap point-1 with
692 * point-2.  (Behaves as observed in tcsh and emacs).
693 */
694void owl_editwin_transpose_chars(owl_editwin *e)
695{
696  char *middle, *end, *start, *tmp;
697
698  if (e->bufflen == 0) return;
699
700  if (e->index == e->bufflen)
701    owl_editwin_point_move(e, -1);     /* point is after last character */
702
703  if (owl_editwin_at_beginning_of_buffer(e))
704    return;     /* point is at beginning of buffer, do nothing */
705
706  /* Transpose two utf-8 unicode glyphs. */
707  middle = e->buff + e->index;
708
709  end = oe_next_point(e, middle);
710  if (end == NULL)
711    return;
712
713  start = oe_prev_point(e, middle);
714  if (start == NULL)
715    return;
716
717  tmp = owl_malloc((end - start) + 1);
718  tmp[(end - start)] = 0;
719  memcpy(tmp, middle, end - middle);
720  memcpy(tmp + (end - middle), start, middle - start);
721
722  owl_editwin_point_move(e, -1);
723  owl_editwin_replace(e, 2, tmp);
724}
725
726/* insert 'string' at the current point, later text is shifted
727 * right
728 */
729void owl_editwin_insert_string(owl_editwin *e, char *s)
730{
731  owl_editwin_replace(e, 0, s);
732}
733
734/* We assume index is not set to point to a mid-char */
735static gunichar owl_editwin_get_char_at_point(owl_editwin *e)
736{
737  return g_utf8_get_char(e->buff + e->index);
738}
739
740void owl_editwin_exchange_point_and_mark(owl_editwin *e) {
741  int tmp;
742
743  if (e->mark != -1) {
744    tmp = e->mark;
745    owl_editwin_set_mark(e);
746    oe_set_index(e, tmp);
747  }
748}
749
750int owl_editwin_point_move(owl_editwin *e, int delta)
751{
752  char *p;
753  int change, d = 0;
754
755  change = MAX(delta, - delta);
756  p = e->buff + e->index;
757
758  while (d < change && p != NULL) {
759    if (delta > 0)
760      p = oe_next_point(e, p);
761    else
762      p = oe_prev_point(e, p);
763    if (p != NULL) {
764      oe_set_index(e, p - e->buff);
765      d++;
766    }
767  }
768
769  return delta > 0 ? d : -d;
770}
771
772int owl_editwin_at_beginning_of_buffer(owl_editwin *e) {
773  if (e->index == e->lock)
774    return 1;
775
776  return 0;
777}
778
779int owl_at_end_of_buffer(owl_editwin *e) {
780  if (e->index == e->bufflen)
781    return 1;
782
783  return 0;
784}
785
786int owl_editwin_at_beginning_of_line(owl_editwin *e) /*noproto*/
787{
788  oe_excursion x;
789  int ret;
790
791  if (owl_editwin_at_beginning_of_buffer(e))
792    return 1;
793
794  oe_save_excursion(e, &x);
795  owl_editwin_point_move(e, -1);
796  ret = (owl_editwin_get_char_at_point(e) == '\n');
797  oe_restore_excursion(e, &x);
798
799  return ret;
800}
801
802static int owl_editwin_is_char_in(owl_editwin *e, char *set)
803{
804  char *p;
805
806  for (p = set; *p != 0; p = g_utf8_find_next_char(p, NULL))
807    if (owl_editwin_get_char_at_point(e) == g_utf8_get_char(p))
808      return 1;
809  return 0;
810}
811
812int owl_editwin_move_if_in(owl_editwin *e, int delta, char *set)
813{
814  int change, distance = 0;
815  while (owl_editwin_is_char_in(e, set)) {
816    change = owl_editwin_point_move(e, delta);
817    distance += change;
818    if (change == 0)
819      break;
820  }
821  return distance;
822}
823
824int owl_editwin_move_if_not_in(owl_editwin *e, int delta, char *set)
825{
826  int change, distance = 0;
827  while (!owl_editwin_is_char_in(e, set)) {
828    change = owl_editwin_point_move(e, delta);
829    distance += change;
830    if (change == 0)
831      break;
832  }
833  return distance;
834}
835
836int owl_editwin_move_to_beginning_of_line(owl_editwin *e)
837{
838  int distance = 0;
839
840  if (!owl_editwin_at_beginning_of_line(e)) {
841    /* move off the \n if were at the end of a line */
842    distance += owl_editwin_point_move(e, -1);
843    distance += owl_editwin_move_if_not_in(e, -1, "\n");
844    if (distance && !owl_editwin_at_beginning_of_buffer(e))
845      distance += owl_editwin_point_move(e, 1);
846  }
847  e->goal_column = 0; /* subtleties */
848
849  return distance;
850}
851
852int owl_editwin_move_to_end_of_line(owl_editwin *e)
853{
854  return owl_editwin_move_if_not_in(e, 1, "\n");
855}
856
857int owl_editwin_line_move(owl_editwin *e, int delta)
858{
859  int goal_column, change, ll, distance;
860  int count = 0;
861
862  change = MAX(delta, -delta);
863
864  goal_column = e->goal_column;
865  distance = owl_editwin_move_to_beginning_of_line(e);
866  goal_column = goal_column == -1 ? -distance : goal_column;
867
868  while(count < change) {
869    if (delta > 0) {
870      distance += owl_editwin_move_if_not_in(e, 1, "\n");
871      distance += owl_editwin_point_move(e, 1);
872    } else {
873      /* I really want to assert delta < 0 here */
874      distance += owl_editwin_point_move(e, -1); /* to the newline on
875                                                    the previous line */
876      distance += owl_editwin_move_to_beginning_of_line(e);
877    }
878    count++;
879  }
880
881  distance += (ll = owl_editwin_move_to_end_of_line(e));
882  if (ll > goal_column)
883    distance += owl_editwin_point_move(e, goal_column - ll);
884
885  e->goal_column = goal_column;
886
887  return distance;
888}
889
890void owl_editwin_backspace(owl_editwin *e)
891{
892  /* delete the char before the current one
893   * and shift later chars left
894   */
895  if(owl_editwin_point_move(e, -1))
896    owl_editwin_delete_char(e);
897}
898
899void owl_editwin_key_up(owl_editwin *e)
900{
901  owl_editwin_line_move(e, -1);
902}
903
904void owl_editwin_key_down(owl_editwin *e)
905{
906  owl_editwin_line_move(e, 1);
907}
908
909void owl_editwin_key_left(owl_editwin *e)
910{
911  owl_editwin_point_move(e, -1);
912}
913
914void owl_editwin_key_right(owl_editwin *e)
915{
916  owl_editwin_point_move(e, 1);
917}
918
919int owl_editwin_forward_word(owl_editwin *e)
920{
921  int distance;
922  /* if we're starting on a space, find the first non-space */
923  distance = owl_editwin_move_if_in(e, 1, WHITESPACE);
924
925  /* now find the end of this word */
926  distance += owl_editwin_move_if_not_in(e, 1, WHITESPACE);
927
928  return distance;
929}
930
931void owl_editwin_move_to_nextword(owl_editwin *e)
932{
933  owl_editwin_forward_word(e);
934}
935
936/* go backwards to the last non-space character
937 */
938int owl_editwin_backward_word(owl_editwin *e)
939{
940  oe_excursion x;
941  int distance = 0;
942  int further = 0;
943  int beginning;
944  /* if in middle of word, beginning of word */
945
946  /* if at beginning of a word, find beginning of previous word */
947
948  if (owl_editwin_is_char_in(e, WHITESPACE)) {
949    /* if in whitespace past end of word, find a word , the find the beginning*/
950    distance += owl_editwin_move_if_in(e, -1, WHITESPACE); /* leaves us on the last
951                                                              character of the word */
952    oe_save_excursion(e, &x);
953    /* are we at the beginning of a word? */
954    owl_editwin_point_move(e, -1);
955    beginning = owl_editwin_is_char_in(e, WHITESPACE);
956    oe_restore_excursion(e, &x);
957    if (beginning)
958      return distance;
959   } else {
960    /* in the middle of the word; */
961    oe_save_excursion(e, &x);
962    further += owl_editwin_point_move(e, -1);
963    if (owl_editwin_is_char_in(e, WHITESPACE)) { /* we were at the beginning */
964      distance += owl_editwin_backward_word(e); /* previous case */
965      oe_release_excursion(e, &x);
966      return distance + further;
967    } else {
968      oe_restore_excursion(e, &x);
969    }
970  }
971  distance += owl_editwin_move_if_not_in(e, -1, WHITESPACE);
972  /* will go past */
973  if (e->index > e->lock)
974    distance += owl_editwin_point_move(e, 1);
975  return distance;
976}
977
978void owl_editwin_move_to_previousword(owl_editwin *e)
979{
980  owl_editwin_backward_word(e);
981}
982
983void owl_editwin_delete_nextword(owl_editwin *e)
984{
985  oe_excursion x;
986
987  oe_save_excursion(e, &x);
988  oe_set_mark(e, e->index);
989  owl_editwin_forward_word(e);
990  owl_editwin_kill_region(e);
991  oe_restore_mark_only(e, &x);
992}
993
994void owl_editwin_delete_previousword(owl_editwin *e)
995{
996  oe_excursion x;
997
998  oe_save_excursion(e, &x);
999  oe_set_mark(e, e->index);
1000  owl_editwin_backward_word(e);
1001  owl_editwin_kill_region(e);
1002  oe_restore_mark_only(e, &x);
1003}
1004
1005void owl_editwin_move_to_line_end(owl_editwin *e)
1006{
1007  owl_editwin_move_to_end_of_line(e);
1008}
1009
1010void owl_editwin_delete_to_endofline(owl_editwin *e)
1011{
1012  oe_excursion x;
1013  int distance;
1014
1015  oe_save_excursion(e, &x);
1016  owl_editwin_set_mark(e);
1017  distance = owl_editwin_move_to_end_of_line(e);
1018  if (distance)
1019    owl_editwin_kill_region(e);
1020  else
1021    owl_editwin_replace(e, 1, "");
1022  oe_restore_excursion(e, &x);
1023}
1024
1025void owl_editwin_yank(owl_editwin *e)
1026{
1027  if (e->killbuf != NULL)
1028    owl_editwin_replace(e, 0, e->killbuf);
1029}
1030
1031static char *oe_copy_buf(owl_editwin *e, char *buf, int len)
1032{
1033  char *p;
1034
1035  p = owl_malloc(len + 1);
1036
1037  if (p != NULL) {
1038    owl_free(e->killbuf);
1039    e->killbuf = p;
1040    memcpy(e->killbuf, buf, len);
1041    e->killbuf[len] = 0;
1042  }
1043
1044  return p;
1045}
1046
1047static int oe_copy_region(owl_editwin *e)
1048{
1049  char *p;
1050  int start, end;
1051
1052  if (e->mark == -1)
1053    return 0;
1054
1055  start = MIN(e->index, e->mark);
1056  end = MAX(e->index, e->mark);
1057
1058  p = oe_copy_buf(e, e->buff + start, end - start);
1059  if (p != NULL)
1060    return end - start;
1061  return 0;
1062}
1063
1064void owl_editwin_copy_region_as_kill(owl_editwin *e)
1065{
1066  oe_copy_region(e);
1067}
1068
1069void owl_editwin_kill_region(owl_editwin *e)
1070{
1071  if (e->index > e->mark)
1072    owl_editwin_exchange_point_and_mark(e);
1073
1074  owl_editwin_replace(e, oe_copy_region(e), "");
1075}
1076
1077void owl_editwin_move_to_line_start(owl_editwin *e)
1078{
1079  owl_editwin_move_to_beginning_of_line(e);
1080}
1081
1082void owl_editwin_move_to_end(owl_editwin *e)
1083{
1084  oe_set_index(e, e->bufflen);
1085}
1086
1087void owl_editwin_move_to_top(owl_editwin *e)
1088{
1089  oe_set_index(e, e->lock);
1090}
1091
1092void owl_editwin_backward_paragraph(owl_editwin *e)
1093{
1094  owl_editwin_point_move(e, -1);
1095  for (; e->index >= e->lock; owl_editwin_point_move(e, -1)) {
1096    if (e->index <= e->lock ||
1097        ((e->buff[e->index] == '\n') && (e->buff[e->index - 1]=='\n')))
1098      break;
1099  }
1100}
1101
1102void owl_editwin_forward_paragraph(owl_editwin *e)
1103{
1104  owl_editwin_point_move(e, 1);
1105  /* scan forward to the start of the next paragraph */
1106  for(; e->index < e->bufflen; owl_editwin_point_move(e, 1)) {
1107    if (e->buff[e->index -1] == '\n' && e->buff[e->index] == '\n')
1108      break;
1109  }
1110}
1111
1112int owl_editwin_current_column(owl_editwin *e)
1113{
1114  oe_excursion x;
1115  int lineindex;
1116
1117  oe_save_excursion(e, &x);
1118  owl_editwin_move_to_beginning_of_line(e);
1119  lineindex = e->index;
1120  oe_restore_excursion(e, &x);
1121  return oe_region_width(e, lineindex, e->index, 0);
1122}
1123
1124void owl_editwin_fill_paragraph(owl_editwin *e)
1125{
1126  oe_excursion x;
1127  gunichar ch;
1128  int sentence;
1129
1130  oe_save_excursion(e, &x);
1131
1132  /* Mark the end of the paragraph */
1133  owl_editwin_forward_paragraph(e);
1134  /* Skip the trailing newline */
1135  owl_editwin_point_move(e, -1);
1136  owl_editwin_set_mark(e);
1137
1138  owl_editwin_backward_paragraph(e);
1139
1140  /* Don't mess with the leading newline */
1141  if (owl_editwin_get_char_at_point(e) == '\n')
1142    owl_editwin_point_move(e, 1);
1143
1144  /*
1145   * First pass: Scan forward replacing all series of spaces with ' '
1146   * (or nothing after CJK ideograms)
1147   */
1148  sentence = 0;
1149  for(;e->index < e->mark; owl_editwin_point_move(e, 1)) {
1150    /* bail if we hit a trailing dot on the buffer */
1151    if (strcmp(e->buff + e->index, "\n.") == 0) {
1152      owl_editwin_set_mark(e);
1153      break;
1154    }
1155
1156    ch = owl_editwin_get_char_at_point(e);
1157
1158    if (owl_util_can_break_after(ch) || ch == '\n') {
1159      if (g_unichar_isspace(ch)) {
1160        owl_editwin_replace(e, 1, " ");
1161      }
1162
1163      if (sentence && g_unichar_isspace(owl_editwin_get_char_at_point(e)))
1164        owl_editwin_point_move(e, 1);
1165
1166      while(g_unichar_isspace(owl_editwin_get_char_at_point(e))
1167            && e->index < e->mark) {
1168        owl_editwin_delete_char(e);
1169      }
1170    }
1171
1172    if(ch == '.' || ch == '!' || ch == '?')
1173      sentence = 1;
1174    else
1175      sentence = 0;
1176  }
1177
1178  owl_editwin_backward_paragraph(e);
1179
1180  /* Now go through inserting newlines as needed */
1181  while(e->index < e->mark) {
1182    /* if we've travelled too far, linewrap */
1183    if (owl_editwin_current_column(e) >= e->fillcol)
1184      _owl_editwin_linewrap_word(e);
1185    owl_editwin_point_move(e, 1);
1186  }
1187
1188  oe_restore_excursion(e, &x);
1189}
1190
1191/* returns true if only whitespace remains */
1192int owl_editwin_is_at_end(owl_editwin *e)
1193{
1194  return (only_whitespace(e->buff + e->index));
1195}
1196
1197static int owl_editwin_check_dotsend(owl_editwin *e)
1198{
1199  int zdot = 0;
1200  oe_excursion x;
1201
1202  if (!e->dotsend) return(0);
1203  if (e->index != e->bufflen) return (0);
1204
1205  oe_save_excursion(e, &x);
1206
1207  owl_editwin_point_move(e, -3);
1208
1209  if(strcmp(e->buff + e->index, "\n.\n") == 0) {
1210    owl_editwin_point_move(e, 1);
1211    owl_editwin_replace(e, 2, "");
1212    zdot = 1;
1213  }
1214
1215  oe_restore_excursion(e, &x);
1216
1217  return zdot;
1218}
1219
1220void owl_editwin_post_process_char(owl_editwin *e, owl_input j)
1221{
1222  /* XXX force a redisplay? */
1223  if ((j.ch==13 || j.ch==10) && owl_editwin_check_dotsend(e)) {
1224    owl_command_edit_done(e);
1225    return;
1226  }
1227  owl_editwin_redisplay(e, 0);
1228}
1229
1230static int oe_region_width(owl_editwin *e, int start, int end, int offset)
1231{
1232  char *p;
1233  int width = offset;
1234 
1235  for(p = e->buff + start;
1236      p < e->buff + end;
1237      p = g_utf8_find_next_char(p, NULL))
1238    width += oe_char_width(g_utf8_get_char(p), width);
1239
1240  return width - offset;
1241}
1242
1243static void oe_insert_char(owl_editwin *e, gunichar c)
1244{
1245  oe_excursion x;
1246  char tmp[7];
1247  int replaced = -1;
1248
1249  if (c == '\r') /* translate CRs to NLs */
1250    c = '\n';
1251
1252  if (!g_unichar_iscntrl(c) || c == '\n' || c== '\t' ) {
1253    memset(tmp, 0, 7);
1254
1255    if (c == '\n' && e->style == OWL_EDITWIN_STYLE_ONELINE) {
1256      return;
1257    }
1258
1259    if (e->cursorx != -1 && e->cursorx + oe_char_width(c, e->cursorx) > e->wrapcol) {
1260      /* XXX this is actually wrong:
1261       * + If the line has been been wrapped, we can be past the wrap column but
1262       *   e->cursorx be much smaller.
1263       * + If the user went back and inserted a bunch of stuff in the middle of
1264       *   the line, there may be more than one word past the wrap column.
1265       */
1266      oe_save_excursion(e, &x);
1267
1268      if (c == ' ' || c == '\t') {
1269        owl_editwin_point_move(e, -1);
1270        replaced = -owl_editwin_move_if_in(e, -1, " \t");
1271        if (!replaced) {
1272          c = '\n';
1273          replaced = -1;
1274        }
1275      } else {
1276        while(!owl_editwin_at_beginning_of_line(e)) {
1277          owl_editwin_point_move(e, -1);
1278          if (owl_util_can_break_after(owl_editwin_get_char_at_point(e))) {
1279            replaced = -owl_editwin_move_if_in(e, -1, " \t");
1280            break;
1281          }
1282        }
1283        if (owl_editwin_at_beginning_of_line(e))
1284          replaced = -1;
1285      }
1286      if (replaced && !owl_editwin_at_beginning_of_line(e))
1287        owl_editwin_point_move(e, 1);
1288      if (replaced >= 0) {
1289        owl_editwin_replace(e, replaced, "\n");
1290      }
1291      oe_restore_excursion(e, &x);
1292    }
1293
1294    if (replaced >= 0 && (c == ' ' || c == '\t'))
1295      return; /* our work here is done */
1296
1297    g_unichar_to_utf8(c, tmp);
1298    owl_editwin_replace(e, 0, tmp);
1299  }
1300}
1301
1302void owl_editwin_process_char(owl_editwin *e, owl_input j)
1303{
1304  if (j.ch == ERR)
1305    return;
1306  /* Ignore ncurses control characters. */
1307  if (j.ch < 0x100) {
1308    oe_insert_char(e, j.uch);
1309  }
1310}
1311
1312char *owl_editwin_get_text(owl_editwin *e)
1313{
1314  return(e->buff+e->lock);
1315}
1316
1317char *owl_editwin_get_region(owl_editwin *e)
1318{
1319  int start, end;
1320  start = e->index;
1321  end   = e->mark;
1322  if(start > end) {
1323    int tmp = end;
1324    end = start;
1325    start = tmp;
1326  }
1327
1328  return oe_chunk(e, start, end);
1329}
1330
1331int owl_editwin_get_echochar(owl_editwin *e)
1332{
1333  return e->echochar;
1334}
1335
1336static char *oe_chunk(owl_editwin *e, int start, int end)
1337{
1338  char *p;
1339 
1340  p = owl_malloc(end - start + 1);
1341  memcpy(p, e->buff + start, end - start);
1342  p[end - start] = 0;
1343
1344  return p;
1345}
1346
1347/*
1348 * The only guarantee made about these values is that comparisons
1349 * between them, as well as comparison between multiple calls to these
1350 * functions without modifying the editwin in-between, are meaningful.
1351 */
1352
1353int owl_editwin_get_point(owl_editwin *e)
1354{
1355  return e->index;
1356}
1357
1358int owl_editwin_get_mark(owl_editwin *e)
1359{
1360  return e->mark;
1361}
1362
1363
1364/*
1365 * Local Variables:
1366 * mode:C
1367 * c-basic-offset:2
1368 * End:
1369 */
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