source: editwin.c @ d564c3d

release-1.6release-1.7release-1.8release-1.9
Last change on this file since d564c3d was f449096, checked in by David Benjamin <davidben@mit.edu>, 11 years ago
Drop calls to update_panels outside main loop One call is sufficient. Also, it doesn't do anything without a doupdate anyway.
  • Property mode set to 100644
File size: 30.6 KB
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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(const 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, const char *set);
55static gunichar owl_editwin_get_char_at_point(owl_editwin *e);
56static int owl_editwin_replace_internal(owl_editwin *e, int replace, const char *s);
57static const char *oe_copy_buf(owl_editwin *e, const char *buf, int len);
58static int oe_copy_region(owl_editwin *e);
59static 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
73void owl_editwin_delete(owl_editwin *e)
74{
75  owl_free(e->buff);
76  owl_free(e->killbuf);
77  owl_free(e->command);
78  /* just in case someone forgot to clean up */
79  while (e->excursions) {
80    oe_release_excursion(e, e->excursions);
81  }
82
83  owl_free(e);
84}
85
86static int oe_count_glyphs(const char *s)
87{
88  int count = 0;
89  const char *p;
90
91  for(p = s; *p != 0; p = g_utf8_find_next_char(p, NULL))
92    if (!g_unichar_ismark(g_utf8_get_char(p)))
93      count++;
94
95  return count;
96}
97
98static inline void oe_set_index(owl_editwin *e, int index)
99{
100  if (index != e->index) {
101    e->goal_column = -1;
102    e->cursorx = -1;
103  }
104  e->index = index;
105}
106
107static inline void oe_set_mark(owl_editwin *e, int mark)
108{
109  e->mark = mark;
110}
111
112void owl_editwin_set_mark(owl_editwin *e)
113{
114  oe_set_mark(e, e->index);
115  /* owl_function_makemsg("Mark set."); */
116}
117
118/* initialize the editwin e.
119 * 'win' is an already initialzed curses window that will be used by editwin
120 */
121void owl_editwin_init(owl_editwin *e, WINDOW *win, int winlines, int wincols, int style, owl_history *hist)
122{
123  e->buff=owl_malloc(INCR);
124  e->buff[0]='\0';
125  e->bufflen=0;
126  e->hist=hist;
127  e->allocated=INCR;
128  oe_set_index(e, 0);
129  oe_set_mark(e, -1);
130  if (e->killbuf != NULL)
131    owl_free(e->killbuf);
132  e->killbuf = NULL;
133  e->goal_column = -1;
134  e->cursorx = -1;
135  e->topindex = 0;
136  e->excursions = NULL;
137  owl_editwin_set_curswin(e, win, winlines, wincols);
138  e->style=style;
139  if ((style!=OWL_EDITWIN_STYLE_MULTILINE) &&
140      (style!=OWL_EDITWIN_STYLE_ONELINE)) {
141    e->style=OWL_EDITWIN_STYLE_MULTILINE;
142  }
143  e->lock=0;
144  e->dotsend=0;
145  e->echochar='\0';
146
147  /* We get initialized multiple times, but we need to hold on to
148     the callbacks, so we can't NULL them here. */
149  /*
150    e->command = NULL;
151    e->callback = NULL;
152    e->cbdata = NULL;
153  */
154  if (win) werase(win);
155}
156
157void owl_editwin_set_curswin(owl_editwin *e, WINDOW *w, int winlines, int wincols)
158{
159  e->curswin=w;
160  e->winlines=winlines;
161  e->wincols=wincols;
162  e->fillcol=owl_editwin_limit_maxcols(wincols-7, owl_global_get_edit_maxfillcols(&g));
163  e->wrapcol=owl_editwin_limit_maxcols(wincols-7, owl_global_get_edit_maxwrapcols(&g));
164}
165
166/* echo the character 'ch' for each normal character keystroke,
167 * excepting locktext.  This is useful for entering passwords etc.  If
168 * ch=='\0' characters are echo'd normally
169 */
170void owl_editwin_set_echochar(owl_editwin *e, int ch)
171{
172  e->echochar=ch;
173}
174
175WINDOW *owl_editwin_get_curswin(owl_editwin *e)
176{
177  return(e->curswin);
178}
179
180owl_history *owl_editwin_get_history(owl_editwin *e)
181{
182  return(e->hist);
183}
184
185void owl_editwin_set_dotsend(owl_editwin *e)
186{
187  e->dotsend=1;
188}
189
190void owl_editwin_set_command(owl_editwin *e, const char *command)
191{
192  if(e->command) owl_free(e->command);
193  e->command = owl_strdup(command);
194}
195
196const char *owl_editwin_get_command(owl_editwin *e)
197{
198  if(e->command) return e->command;
199  return "";
200}
201
202void owl_editwin_set_callback(owl_editwin *e, void (*cb)(owl_editwin*))
203{
204  e->callback = cb;
205}
206
207void (*owl_editwin_get_callback(owl_editwin *e))(owl_editwin*)
208{
209  return e->callback;
210}
211
212void owl_editwin_set_cbdata(owl_editwin *e, void *data)
213{
214  e->cbdata = data;
215}
216
217void *owl_editwin_get_cbdata(owl_editwin *e) {
218  return e->cbdata;
219}
220
221void owl_editwin_do_callback(owl_editwin *e) {
222  void (*cb)(owl_editwin*);
223  cb=owl_editwin_get_callback(e);
224  if(!cb) {
225    owl_function_error("Internal error: No editwin callback!");
226  } else {
227    /* owl_function_error("text: |%s|", owl_editwin_get_text(e)); */
228    cb(e);
229  }
230}
231
232static int owl_editwin_limit_maxcols(int v, int maxv)
233{
234  /* maxv > 5 ? MAX(v, vax) : v */
235  if (maxv > 5 && v > maxv) {
236    return(maxv);
237  } else {
238    return(v);
239  }
240}
241
242/* set text to be 'locked in' at the beginning of the buffer, any
243 * previous text (including locked text) will be overwritten
244 */
245void owl_editwin_set_locktext(owl_editwin *e, const char *text)
246{
247  oe_set_index(e, 0);
248  e->lock = 0;
249  owl_editwin_replace(e, e->bufflen, text);
250  e->buff[e->bufflen] = 0;
251  e->lock=e->bufflen;
252  oe_set_index(e, e->lock);
253  owl_editwin_redisplay(e);
254}
255
256int owl_editwin_get_style(owl_editwin *e)
257{
258  return(e->style);
259}
260
261void owl_editwin_new_style(owl_editwin *e, int newstyle, owl_history *h)
262{
263  e->hist = h;
264
265  if (e->style==newstyle) return;
266
267  if (newstyle==OWL_EDITWIN_STYLE_MULTILINE) {
268    e->style=newstyle;
269  } else if (newstyle==OWL_EDITWIN_STYLE_ONELINE) {
270    e->style=newstyle;
271
272    /* nuke everything after the first line */
273    owl_editwin_move_to_top(e);
274    owl_editwin_move_to_end_of_line(e);
275    owl_editwin_replace(e, oe_count_glyphs(e->buff + e->index),  "");
276  }
277}
278
279/* completly reinitialize the buffer */
280void owl_editwin_fullclear(owl_editwin *e)
281{
282  owl_free(e->buff);
283  owl_editwin_init(e, e->curswin, e->winlines, e->wincols, e->style, e->hist);
284}
285
286/* clear all text except for locktext and put the cursor at the
287 * beginning
288 */
289void owl_editwin_clear(owl_editwin *e)
290{
291
292  int lock = e->lock;
293  int dotsend=e->dotsend;
294  char *locktext=NULL;
295  char echochar=e->echochar;
296
297  if (lock > 0) {
298    locktext = owl_malloc(lock+1);
299    strncpy(locktext, e->buff, lock);
300    locktext[lock] = 0;
301  }
302
303  owl_free(e->buff);
304  owl_editwin_init(e, e->curswin, e->winlines, e->wincols, e->style, e->hist);
305
306  if (lock > 0) {
307    owl_editwin_set_locktext(e, locktext);
308  }
309  if (dotsend) {
310    owl_editwin_set_dotsend(e);
311  }
312  if (echochar) {
313    owl_editwin_set_echochar(e, echochar);
314  }
315
316  if (locktext)
317    owl_free(locktext);
318
319  oe_set_index(e, lock);
320}
321
322void owl_editwin_recenter(owl_editwin *e)
323{
324  e->topindex = -1;
325}
326
327static void oe_save_excursion(owl_editwin *e, oe_excursion *x)
328{
329  x->index = e->index;
330  x->mark = e->mark;
331  x->goal_column = e->goal_column;
332  x->lock = e->lock;
333
334  x->valid = VALID_EXCURSION;
335  x->next = e->excursions;
336  e->excursions = x;
337}
338
339static void oe_release_excursion(owl_editwin *e, oe_excursion *x)
340{
341  oe_excursion **px;
342
343  x->valid = 0;
344  for (px = &e->excursions; *px != NULL; px = &(*px)->next)
345    if (*px == x) {
346      *px = x->next;
347      return;
348    }
349  abort();
350}
351
352static void oe_restore_excursion(owl_editwin *e, oe_excursion *x)
353{
354  if (x->valid == VALID_EXCURSION) {
355    oe_set_index(e, x->index);
356    e->goal_column = x->goal_column;
357    e->mark = x->mark;
358    e->lock = x->lock;
359
360    oe_release_excursion(e, x);
361  }
362}
363
364static void oe_restore_mark_only(owl_editwin *e, oe_excursion *x)
365{
366  if (x->valid == VALID_EXCURSION) {
367    e->mark = x->mark;
368
369    oe_release_excursion(e, x);
370  }
371}
372
373/* External interface to oe_save_excursion */
374owl_editwin_excursion *owl_editwin_begin_excursion(owl_editwin *e)
375{
376  owl_editwin_excursion *x = owl_malloc(sizeof *x);
377  oe_save_excursion(e, x);
378  return x;
379}
380
381void owl_editwin_end_excursion(owl_editwin *e, owl_editwin_excursion *x)
382{
383  oe_restore_excursion(e, x);
384  owl_free(x);
385}
386
387static inline const char *oe_next_point(owl_editwin *e, const char *p)
388{
389  const char *boundary = e->buff + e->bufflen + 1;
390  const char *q;
391
392  q = g_utf8_find_next_char(p, boundary);
393  while (q && g_unichar_ismark(g_utf8_get_char(q)))
394    q = g_utf8_find_next_char(q, boundary);
395
396  if (q == p)
397    return NULL;
398  return q;
399}
400
401static inline const char *oe_prev_point(owl_editwin *e, const char *p)
402{
403  const char *boundary = e->buff + e->lock;
404
405  p = g_utf8_find_prev_char(boundary, p);
406  while (p && g_unichar_ismark(g_utf8_get_char(p)))
407    p = g_utf8_find_prev_char(boundary, p);
408
409  return p;
410}
411
412static int oe_char_width(gunichar c, int column)
413{
414  int cw;
415
416  if (c == 9) /* TAB */
417    return TABSIZE - column % TABSIZE;
418
419  cw = mk_wcwidth(c);
420
421  if (cw < 0) /* control characters */
422    cw = 0;
423
424  return cw;
425}
426
427static int oe_find_display_line(owl_editwin *e, int *x, int index)
428{
429  int width = 0, cw;
430  gunichar c;
431  const char *p;
432
433  while(1) {
434    /* note the position of the dot */
435    if (x != NULL && index == e->index && width < e->wincols)
436      *x = width;
437
438    /* get the current character */
439    c = g_utf8_get_char(e->buff + index);
440
441    /* figure out how wide it is */
442    cw = oe_char_width(c, width);
443
444    if (width + cw > e->wincols) {
445      if (x != NULL && *x == width)
446        *x = -1;
447      break;
448    }
449    width += cw;
450
451    if (c == '\n') {
452      if (width < e->wincols)
453        ++index; /* skip the newline */
454      break;
455    }
456
457    /* find the next character */
458    p = oe_next_point(e, e->buff + index);
459    if (p == NULL) { /* we ran off the end */
460      if (x != NULL && e->index > index)
461        *x = width + 1;
462      break;
463    }
464    index = p - e->buff;
465
466  }
467  return index;
468}
469
470static void oe_reframe(owl_editwin *e) {
471  oe_excursion x;
472  int goal = 1 + e->winlines / 2;
473  int index;
474  int count = 0;
475  int n, i;
476  int last;
477
478  oe_save_excursion(e, &x);
479  /* step back line-by-line through the buffer until we have >= goal lines of
480     display text */
481  e->lock = 0; /* we can (must) tread on the locktext */
482
483  last = -1;
484  while (count < goal) {
485    index = e->index;
486    owl_editwin_move_to_beginning_of_line(e);
487    if (last == e->index)
488      break;
489    last = e->index;
490    for (n = 0, i = e->index; i < index; n++)
491      i = oe_find_display_line(e, NULL, i);
492    count += n == 0 ? 1 : n;
493    if (count < goal)
494      owl_editwin_point_move(e, -1);
495  }
496
497  e->topindex = e->index;
498  /* if we overshot, backtrack */
499  for (n = 0; n < (count - goal); n++)
500    e->topindex = oe_find_display_line(e, NULL, e->topindex);
501
502  oe_restore_excursion(e, &x);
503}
504
505static void oe_addnec(owl_editwin *e, int count)
506{
507  int i;
508
509  for (i = 0; i < count; i++)
510    waddch(e->curswin, e->echochar);
511}
512
513static void oe_mvaddnec(owl_editwin *e, int y, int x, int count)
514{
515  wmove(e->curswin, y, x);
516  oe_addnec(e, count);
517}
518
519/* regenerate the text on the curses window */
520void owl_editwin_redisplay(owl_editwin *e)
521{
522  int x = -1, y = -1, t;
523  int line, index, lineindex, times = 0;
524
525  do {
526    werase(e->curswin);
527
528    if (e->topindex == -1 || e->index < e->topindex)
529      oe_reframe(e);
530
531    line = 0;
532    index = e->topindex;
533    while(line < e->winlines) {
534      lineindex = index;
535      t = -1;
536      index = oe_find_display_line(e, &t, lineindex);
537      if (x == -1 && t != -1)
538        x = t, y = line;
539      if (index - lineindex) {
540        if (!e->echochar)
541          mvwaddnstr(e->curswin, line, 0,
542                     e->buff + lineindex,
543                     index - lineindex);
544        else {
545          if(lineindex < e->lock) {
546            mvwaddnstr(e->curswin, line, 0,
547                       e->buff + lineindex,
548                       MIN(index - lineindex,
549                           e->lock - lineindex));
550            if (e->lock < index)
551              oe_addnec(e,
552                        oe_region_width(e, e->lock, index,
553                                        oe_region_width(e, lineindex, e->lock, 0)));
554          } else
555            oe_mvaddnec(e, line, 0, oe_region_width(e, line, index, 0));
556        }
557      }
558      line++;
559    }
560    if (x == -1)
561        e->topindex = -1; /* force a reframe */
562    times++;
563  } while(x == -1 && times < 3);
564
565  wmove(e->curswin, y, x);
566  e->cursorx = x;
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 + change;
573    else
574      *target += change;
575  }
576}
577
578int owl_editwin_replace_region(owl_editwin *e, const char *s)
579{
580  oe_excursion x;
581  int ret;
582  oe_save_excursion(e, &x);
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, const char *s)
597{
598  int start, end, i;
599  const 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, const char *s)
618{
619  int start, end, free, need, size, change;
620  oe_excursion *x;
621
622  start = e->index;
623  end   = start + replace;
624
625  free = e->allocated - e->bufflen + end - start;
626
627  need = strlen(s) - free;
628  if (need > 0) {
629    size = e->allocated + need + INCR - (need % INCR);
630    e->buff = owl_realloc(e->buff, size);
631    e->allocated = size;
632  }
633
634  memmove(e->buff + start + strlen(s), e->buff + end, e->bufflen + 1 - end);
635  memcpy(e->buff + start, s, strlen(s));
636  change = start - end + strlen(s);
637  e->bufflen += change;
638  e->index += strlen(s);
639
640  /* fix up the mark */
641  oe_fixup(&e->mark, start, end, change);
642  oe_fixup(&e->topindex, start, end, change);
643  /* fix up any saved points after the replaced area */
644  for (x = e->excursions; x != NULL; x = x->next) {
645    oe_fixup(&x->index, start, end, change);
646    oe_fixup(&x->mark, start, end, change);
647  }
648
649  /* recenter if needed */
650  if (start <= e->topindex)
651    owl_editwin_recenter(e);
652
653  return change;
654}
655
656/* linewrap the word just before the cursor.
657 * returns 0 on success
658 * returns -1 if we could not wrap.
659 */
660static void _owl_editwin_linewrap_word(owl_editwin *e)
661{
662  oe_excursion x;
663  gunichar c;
664
665  oe_save_excursion(e, &x);
666
667  while (owl_editwin_point_move(e, -1)) {
668    c = owl_editwin_get_char_at_point(e);
669    if (owl_util_can_break_after(c) || c == '\n') {
670      if (c != '\n')
671        owl_editwin_replace(e, c != ' ' ? 0 : 1, "\n");
672      break;
673    }
674  }
675
676  oe_restore_excursion(e, &x);
677}
678
679/* delete the character at the current point, following chars
680 * shift left.
681 */
682void owl_editwin_delete_char(owl_editwin *e)
683{
684  owl_editwin_replace(e, 1, "");
685}
686
687/* Swap the character at point with the character at point-1 and
688 * advance the pointer.  If point is at beginning of buffer do
689 * nothing.  If point is after the last character swap point-1 with
690 * point-2.  (Behaves as observed in tcsh and emacs).
691 */
692void owl_editwin_transpose_chars(owl_editwin *e)
693{
694  const char *middle, *end, *start;
695  char *tmp;
696
697  if (e->bufflen == 0) return;
698
699  if (e->index == e->bufflen)
700    owl_editwin_point_move(e, -1);     /* point is after last character */
701
702  if (owl_editwin_at_beginning_of_buffer(e))
703    return;     /* point is at beginning of buffer, do nothing */
704
705  /* Transpose two utf-8 unicode glyphs. */
706  middle = e->buff + e->index;
707
708  end = oe_next_point(e, middle);
709  if (end == NULL)
710    return;
711
712  start = oe_prev_point(e, middle);
713  if (start == NULL)
714    return;
715
716  tmp = owl_malloc((end - start) + 1);
717  tmp[(end - start)] = 0;
718  memcpy(tmp, middle, end - middle);
719  memcpy(tmp + (end - middle), start, middle - start);
720
721  owl_editwin_point_move(e, -1);
722  owl_editwin_replace(e, 2, tmp);
723}
724
725/* insert 'string' at the current point, later text is shifted
726 * right
727 */
728void owl_editwin_insert_string(owl_editwin *e, const char *s)
729{
730  owl_editwin_replace(e, 0, s);
731}
732
733/* We assume index is not set to point to a mid-char */
734static gunichar owl_editwin_get_char_at_point(owl_editwin *e)
735{
736  return g_utf8_get_char(e->buff + e->index);
737}
738
739void owl_editwin_exchange_point_and_mark(owl_editwin *e) {
740  int tmp;
741
742  if (e->mark != -1) {
743    tmp = e->mark;
744    owl_editwin_set_mark(e);
745    oe_set_index(e, tmp);
746  }
747}
748
749int owl_editwin_point_move(owl_editwin *e, int delta)
750{
751  const char *p;
752  int change, d = 0;
753
754  change = MAX(delta, - delta);
755  p = e->buff + e->index;
756
757  while (d < change && p != NULL) {
758    if (delta > 0)
759      p = oe_next_point(e, p);
760    else
761      p = oe_prev_point(e, p);
762    if (p != NULL) {
763      oe_set_index(e, p - e->buff);
764      d++;
765    }
766  }
767
768  return delta > 0 ? d : -d;
769}
770
771int owl_editwin_at_beginning_of_buffer(owl_editwin *e) {
772  if (e->index == e->lock)
773    return 1;
774
775  return 0;
776}
777
778int owl_at_end_of_buffer(owl_editwin *e) {
779  if (e->index == e->bufflen)
780    return 1;
781
782  return 0;
783}
784
785static int owl_editwin_at_beginning_of_line(owl_editwin *e)
786{
787  oe_excursion x;
788  int ret;
789
790  if (owl_editwin_at_beginning_of_buffer(e))
791    return 1;
792
793  oe_save_excursion(e, &x);
794  owl_editwin_point_move(e, -1);
795  ret = (owl_editwin_get_char_at_point(e) == '\n');
796  oe_restore_excursion(e, &x);
797
798  return ret;
799}
800
801static int owl_editwin_is_char_in(owl_editwin *e, const char *set)
802{
803  const char *p;
804
805  for (p = set; *p != 0; p = g_utf8_find_next_char(p, NULL))
806    if (owl_editwin_get_char_at_point(e) == g_utf8_get_char(p))
807      return 1;
808  return 0;
809}
810
811int owl_editwin_move_if_in(owl_editwin *e, int delta, const char *set)
812{
813  int change, distance = 0;
814  while (owl_editwin_is_char_in(e, set)) {
815    change = owl_editwin_point_move(e, delta);
816    distance += change;
817    if (change == 0)
818      break;
819  }
820  return distance;
821}
822
823int owl_editwin_move_if_not_in(owl_editwin *e, int delta, const char *set)
824{
825  int change, distance = 0;
826  while (!owl_editwin_is_char_in(e, set)) {
827    change = owl_editwin_point_move(e, delta);
828    distance += change;
829    if (change == 0)
830      break;
831  }
832  return distance;
833}
834
835int owl_editwin_move_to_beginning_of_line(owl_editwin *e)
836{
837  int distance = 0;
838
839  if (!owl_editwin_at_beginning_of_line(e)) {
840    /* move off the \n if were at the end of a line */
841    distance += owl_editwin_point_move(e, -1);
842    distance += owl_editwin_move_if_not_in(e, -1, "\n");
843    if (distance && !owl_editwin_at_beginning_of_buffer(e))
844      distance += owl_editwin_point_move(e, 1);
845  }
846  e->goal_column = 0; /* subtleties */
847
848  return distance;
849}
850
851int owl_editwin_move_to_end_of_line(owl_editwin *e)
852{
853  return owl_editwin_move_if_not_in(e, 1, "\n");
854}
855
856int owl_editwin_line_move(owl_editwin *e, int delta)
857{
858  int goal_column, change, ll, distance;
859  int count = 0;
860
861  change = MAX(delta, -delta);
862
863  goal_column = e->goal_column;
864  distance = owl_editwin_move_to_beginning_of_line(e);
865  goal_column = goal_column == -1 ? -distance : goal_column;
866
867  while(count < change) {
868    if (delta > 0) {
869      distance += owl_editwin_move_if_not_in(e, 1, "\n");
870      distance += owl_editwin_point_move(e, 1);
871    } else {
872      /* I really want to assert delta < 0 here */
873      distance += owl_editwin_point_move(e, -1); /* to the newline on
874                                                    the previous line */
875      distance += owl_editwin_move_to_beginning_of_line(e);
876    }
877    count++;
878  }
879
880  distance += (ll = owl_editwin_move_to_end_of_line(e));
881  if (ll > goal_column)
882    distance += owl_editwin_point_move(e, goal_column - ll);
883
884  e->goal_column = goal_column;
885
886  return distance;
887}
888
889void owl_editwin_backspace(owl_editwin *e)
890{
891  /* delete the char before the current one
892   * and shift later chars left
893   */
894  if(owl_editwin_point_move(e, -1))
895    owl_editwin_delete_char(e);
896}
897
898void owl_editwin_key_up(owl_editwin *e)
899{
900  owl_editwin_line_move(e, -1);
901}
902
903void owl_editwin_key_down(owl_editwin *e)
904{
905  owl_editwin_line_move(e, 1);
906}
907
908void owl_editwin_key_left(owl_editwin *e)
909{
910  owl_editwin_point_move(e, -1);
911}
912
913void owl_editwin_key_right(owl_editwin *e)
914{
915  owl_editwin_point_move(e, 1);
916}
917
918int owl_editwin_forward_word(owl_editwin *e)
919{
920  int distance;
921  /* if we're starting on a space, find the first non-space */
922  distance = owl_editwin_move_if_in(e, 1, WHITESPACE);
923
924  /* now find the end of this word */
925  distance += owl_editwin_move_if_not_in(e, 1, WHITESPACE);
926
927  return distance;
928}
929
930void owl_editwin_move_to_nextword(owl_editwin *e)
931{
932  owl_editwin_forward_word(e);
933}
934
935/* go backwards to the last non-space character
936 */
937int owl_editwin_backward_word(owl_editwin *e)
938{
939  oe_excursion x;
940  int distance = 0;
941  int further = 0;
942  int beginning;
943  /* if in middle of word, beginning of word */
944
945  /* if at beginning of a word, find beginning of previous word */
946
947  if (owl_editwin_is_char_in(e, WHITESPACE)) {
948    /* if in whitespace past end of word, find a word , the find the beginning*/
949    distance += owl_editwin_move_if_in(e, -1, WHITESPACE); /* leaves us on the last
950                                                              character of the word */
951    oe_save_excursion(e, &x);
952    /* are we at the beginning of a word? */
953    owl_editwin_point_move(e, -1);
954    beginning = owl_editwin_is_char_in(e, WHITESPACE);
955    oe_restore_excursion(e, &x);
956    if (beginning)
957      return distance;
958   } else {
959    /* in the middle of the word; */
960    oe_save_excursion(e, &x);
961    further += owl_editwin_point_move(e, -1);
962    if (owl_editwin_is_char_in(e, WHITESPACE)) { /* we were at the beginning */
963      distance += owl_editwin_backward_word(e); /* previous case */
964      oe_release_excursion(e, &x);
965      return distance + further;
966    } else {
967      oe_restore_excursion(e, &x);
968    }
969  }
970  distance += owl_editwin_move_if_not_in(e, -1, WHITESPACE);
971  /* will go past */
972  if (e->index > e->lock)
973    distance += owl_editwin_point_move(e, 1);
974  return distance;
975}
976
977void owl_editwin_move_to_previousword(owl_editwin *e)
978{
979  owl_editwin_backward_word(e);
980}
981
982void owl_editwin_delete_nextword(owl_editwin *e)
983{
984  oe_excursion x;
985
986  oe_save_excursion(e, &x);
987  oe_set_mark(e, e->index);
988  owl_editwin_forward_word(e);
989  owl_editwin_kill_region(e);
990  oe_restore_mark_only(e, &x);
991}
992
993void owl_editwin_delete_previousword(owl_editwin *e)
994{
995  oe_excursion x;
996
997  oe_save_excursion(e, &x);
998  oe_set_mark(e, e->index);
999  owl_editwin_backward_word(e);
1000  owl_editwin_kill_region(e);
1001  oe_restore_mark_only(e, &x);
1002}
1003
1004void owl_editwin_move_to_line_end(owl_editwin *e)
1005{
1006  owl_editwin_move_to_end_of_line(e);
1007}
1008
1009void owl_editwin_delete_to_endofline(owl_editwin *e)
1010{
1011  oe_excursion x;
1012  int distance;
1013
1014  oe_save_excursion(e, &x);
1015  owl_editwin_set_mark(e);
1016  distance = owl_editwin_move_to_end_of_line(e);
1017  if (distance)
1018    owl_editwin_kill_region(e);
1019  else
1020    owl_editwin_replace(e, 1, "");
1021  oe_restore_excursion(e, &x);
1022}
1023
1024void owl_editwin_yank(owl_editwin *e)
1025{
1026  if (e->killbuf != NULL)
1027    owl_editwin_replace(e, 0, e->killbuf);
1028}
1029
1030static const char *oe_copy_buf(owl_editwin *e, const char *buf, int len)
1031{
1032  char *p;
1033
1034  p = owl_malloc(len + 1);
1035
1036  if (p != NULL) {
1037    owl_free(e->killbuf);
1038    e->killbuf = p;
1039    memcpy(e->killbuf, buf, len);
1040    e->killbuf[len] = 0;
1041  }
1042
1043  return p;
1044}
1045
1046static int oe_copy_region(owl_editwin *e)
1047{
1048  const char *p;
1049  int start, end;
1050
1051  if (e->mark == -1)
1052    return 0;
1053
1054  start = MIN(e->index, e->mark);
1055  end = MAX(e->index, e->mark);
1056
1057  p = oe_copy_buf(e, e->buff + start, end - start);
1058  if (p != NULL)
1059    return end - start;
1060  return 0;
1061}
1062
1063void owl_editwin_copy_region_as_kill(owl_editwin *e)
1064{
1065  oe_copy_region(e);
1066}
1067
1068void owl_editwin_kill_region(owl_editwin *e)
1069{
1070  if (e->index > e->mark)
1071    owl_editwin_exchange_point_and_mark(e);
1072
1073  owl_editwin_replace_internal(e, oe_copy_region(e), "");
1074}
1075
1076void owl_editwin_move_to_line_start(owl_editwin *e)
1077{
1078  owl_editwin_move_to_beginning_of_line(e);
1079}
1080
1081void owl_editwin_move_to_end(owl_editwin *e)
1082{
1083  oe_set_index(e, e->bufflen);
1084}
1085
1086void owl_editwin_move_to_top(owl_editwin *e)
1087{
1088  oe_set_index(e, e->lock);
1089}
1090
1091void owl_editwin_backward_paragraph(owl_editwin *e)
1092{
1093  owl_editwin_point_move(e, -1);
1094  for (; e->index >= e->lock; owl_editwin_point_move(e, -1)) {
1095    if (e->index <= e->lock ||
1096        ((e->buff[e->index] == '\n') && (e->buff[e->index - 1]=='\n')))
1097      break;
1098  }
1099}
1100
1101void owl_editwin_forward_paragraph(owl_editwin *e)
1102{
1103  owl_editwin_point_move(e, 1);
1104  /* scan forward to the start of the next paragraph */
1105  for(; e->index < e->bufflen; owl_editwin_point_move(e, 1)) {
1106    if (e->buff[e->index -1] == '\n' && e->buff[e->index] == '\n')
1107      break;
1108  }
1109}
1110
1111int owl_editwin_current_column(owl_editwin *e)
1112{
1113  oe_excursion x;
1114  int lineindex;
1115
1116  oe_save_excursion(e, &x);
1117  owl_editwin_move_to_beginning_of_line(e);
1118  lineindex = e->index;
1119  oe_restore_excursion(e, &x);
1120  return oe_region_width(e, lineindex, e->index, 0);
1121}
1122
1123void owl_editwin_fill_paragraph(owl_editwin *e)
1124{
1125  oe_excursion x;
1126  gunichar ch;
1127  int sentence;
1128
1129  oe_save_excursion(e, &x);
1130
1131  /* Mark the end of the paragraph */
1132  owl_editwin_forward_paragraph(e);
1133  /* Skip the trailing newline */
1134  owl_editwin_point_move(e, -1);
1135  owl_editwin_set_mark(e);
1136
1137  owl_editwin_backward_paragraph(e);
1138
1139  /* Don't mess with the leading newline */
1140  if (owl_editwin_get_char_at_point(e) == '\n')
1141    owl_editwin_point_move(e, 1);
1142
1143  /*
1144   * First pass: Scan forward replacing all series of spaces with ' '
1145   * (or nothing after CJK ideograms)
1146   */
1147  sentence = 0;
1148  for(;e->index < e->mark; owl_editwin_point_move(e, 1)) {
1149    /* bail if we hit a trailing dot on the buffer */
1150    if (strcmp(e->buff + e->index, "\n.") == 0) {
1151      owl_editwin_set_mark(e);
1152      break;
1153    }
1154
1155    ch = owl_editwin_get_char_at_point(e);
1156
1157    if (owl_util_can_break_after(ch) || ch == '\n') {
1158      if (g_unichar_isspace(ch)) {
1159        owl_editwin_replace(e, 1, " ");
1160      }
1161
1162      if (sentence && g_unichar_isspace(owl_editwin_get_char_at_point(e))
1163          && e->index < e->mark)
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 (!owl_editwin_is_at_end(e)) return (0);
1204
1205  oe_save_excursion(e, &x);
1206
1207  owl_editwin_point_move(e, -3);
1208
1209  if(strncmp(e->buff + e->index, "\n.\n", 3) == 0) {
1210    owl_editwin_point_move(e, 1);
1211    zdot = 1;
1212  } else if(e->index == e->lock &&
1213            strncmp(e->buff + e->index, ".\n", 2) == 0) {
1214    zdot = 1;
1215  }
1216
1217  if(zdot) {
1218    owl_editwin_set_mark(e);
1219    owl_editwin_move_to_end(e);
1220    owl_editwin_replace_region(e, "");
1221  }
1222
1223  oe_restore_excursion(e, &x);
1224
1225  return zdot;
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_edit_done(e);
1233    return;
1234  }
1235  owl_editwin_redisplay(e);
1236}
1237
1238static int oe_region_width(owl_editwin *e, int start, int end, int offset)
1239{
1240  const 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    if (c == '\n' && e->style == OWL_EDITWIN_STYLE_ONELINE) {
1262      return;
1263    }
1264
1265    if (e->cursorx != -1 && e->cursorx + oe_char_width(c, e->cursorx) > e->wrapcol) {
1266      /* XXX this is actually wrong:
1267       * + If the line has been been wrapped, we can be past the wrap column but
1268       *   e->cursorx be much smaller.
1269       * + If the user went back and inserted a bunch of stuff in the middle of
1270       *   the line, there may be more than one word past the wrap column.
1271       */
1272      oe_save_excursion(e, &x);
1273
1274      if (c == ' ' || c == '\t') {
1275        owl_editwin_point_move(e, -1);
1276        replaced = -owl_editwin_move_if_in(e, -1, " \t");
1277        if (!replaced) {
1278          c = '\n';
1279          replaced = -1;
1280        }
1281      } else {
1282        while(!owl_editwin_at_beginning_of_line(e)) {
1283          owl_editwin_point_move(e, -1);
1284          if (owl_util_can_break_after(owl_editwin_get_char_at_point(e))) {
1285            replaced = -owl_editwin_move_if_in(e, -1, " \t");
1286            break;
1287          }
1288        }
1289        if (owl_editwin_at_beginning_of_line(e))
1290          replaced = -1;
1291      }
1292      if (replaced && !owl_editwin_at_beginning_of_line(e))
1293        owl_editwin_point_move(e, 1);
1294      if (replaced >= 0) {
1295        owl_editwin_replace(e, replaced, "\n");
1296      }
1297      oe_restore_excursion(e, &x);
1298    }
1299
1300    if (replaced >= 0 && (c == ' ' || c == '\t'))
1301      return; /* our work here is done */
1302
1303    tmp[g_unichar_to_utf8(c, tmp)] = '\0';
1304    owl_editwin_replace(e, 0, tmp);
1305  }
1306}
1307
1308void owl_editwin_process_char(owl_editwin *e, owl_input j)
1309{
1310  if (j.ch == ERR)
1311    return;
1312  /* Ignore ncurses control characters. */
1313  if (j.ch < 0x100) {
1314    oe_insert_char(e, j.uch);
1315  }
1316}
1317
1318const char *owl_editwin_get_text(owl_editwin *e)
1319{
1320  return(e->buff+e->lock);
1321}
1322
1323char *owl_editwin_get_region(owl_editwin *e)
1324{
1325  int start, end;
1326  start = e->index;
1327  end   = e->mark;
1328  if(start > end) {
1329    int tmp = end;
1330    end = start;
1331    start = tmp;
1332  }
1333
1334  return oe_chunk(e, start, end);
1335}
1336
1337int owl_editwin_get_echochar(owl_editwin *e)
1338{
1339  return e->echochar;
1340}
1341
1342static char *oe_chunk(owl_editwin *e, int start, int end)
1343{
1344  char *p;
1345 
1346  p = owl_malloc(end - start + 1);
1347  memcpy(p, e->buff + start, end - start);
1348  p[end - start] = 0;
1349
1350  return p;
1351}
1352
1353/*
1354 * The only guarantee made about these values is that comparisons
1355 * between them, as well as comparison between multiple calls to these
1356 * functions without modifying the editwin in-between, are meaningful.
1357 */
1358
1359int owl_editwin_get_point(owl_editwin *e)
1360{
1361  return e->index;
1362}
1363
1364int owl_editwin_get_mark(owl_editwin *e)
1365{
1366  return e->mark;
1367}
1368
1369
1370/*
1371 * Local Variables:
1372 * mode:C
1373 * c-basic-offset:2
1374 * End:
1375 */
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