source: editwin.c @ 2be605a

release-1.4release-1.5release-1.6release-1.7release-1.8release-1.9
Last change on this file since 2be605a was 435d6b2, checked in by Nelson Elhage <nelhage@mit.edu>, 12 years ago
Rename 'editmulti:' commands to 'edit:'.
  • Property mode set to 100644
File size: 30.3 KB
Line 
1#include "owl.h"
2#include <stdlib.h>
3#include <unistd.h>
4#include <string.h>
5#include <ctype.h>
6
7static const char fileIdent[] = "$Id$";
8
9#define VALID_EXCURSION (0x9a2b4729)
10
11typedef struct _owl_editwin_excursion { /*noproto*/
12  int valid;
13  int index;
14  int mark;
15  int goal_column;
16  int lock;
17  struct _owl_editwin_excursion *next;
18} oe_excursion;
19
20struct _owl_editwin { /*noproto*/
21  char *buff;
22  owl_history *hist;
23  int bufflen;
24  int allocated;
25  int index;
26  int mark;
27  char *killbuf;
28  int goal_column;
29  int topindex;
30  int cursorx;
31  int winlines, wincols, fillcol, wrapcol;
32  WINDOW *curswin;
33  int style;
34  int lock;
35  int dotsend;
36  int echochar;
37  oe_excursion *excursions;
38
39  char *command;
40  void (*callback)(struct _owl_editwin*);
41  void *cbdata;
42};
43
44static void oe_reframe(owl_editwin *e);
45static void oe_save_excursion(owl_editwin *e, oe_excursion *x);
46static void oe_release_excursion(owl_editwin *e, oe_excursion *x);
47static void oe_restore_excursion(owl_editwin *e, oe_excursion *x);
48static void oe_restore_mark_only(owl_editwin *e, oe_excursion *x);
49static int oe_count_glyphs(char *s);
50static int oe_char_width(gunichar c, int column);
51static int oe_region_width(owl_editwin *e, int start, int end, int width);
52static int oe_find_display_line(owl_editwin *e, int *x, int index);
53static void oe_insert_char(owl_editwin *e, gunichar c);
54static int owl_editwin_limit_maxcols(int v, int maxv);
55static int owl_editwin_check_dotsend(owl_editwin *e);
56static int owl_editwin_is_char_in(owl_editwin *e, char *set);
57static gunichar owl_editwin_get_char_at_point(owl_editwin *e);
58static int owl_editwin_replace_internal(owl_editwin *e, int replace, char *s);
59static char *oe_copy_buf(owl_editwin *e, char *buf, int len);
60static int oe_copy_region(owl_editwin *e);
61static 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
368/* External interface to oe_save_excursion */
369owl_editwin_excursion *owl_editwin_begin_excursion(owl_editwin *e)
370{
371  owl_editwin_excursion *x = owl_malloc(sizeof *x);
372  oe_save_excursion(e, x);
373  return x;
374}
375
376void owl_editwin_end_excursion(owl_editwin *e, owl_editwin_excursion *x)
377{
378  oe_restore_excursion(e, x);
379  owl_free(x);
380}
381
382static inline char *oe_next_point(owl_editwin *e, char *p)
383{
384  char *boundary = e->buff + e->bufflen + 1;
385  char *q;
386
387  q = g_utf8_find_next_char(p, boundary);
388  while (q && g_unichar_ismark(g_utf8_get_char(q)))
389    q = g_utf8_find_next_char(q, boundary);
390
391  if (q == p)
392    return NULL;
393  return q;
394}
395
396static inline char *oe_prev_point(owl_editwin *e, char *p)
397{
398  char *boundary = e->buff + e->lock;
399
400  p = g_utf8_find_prev_char(boundary, p);
401  while (p && g_unichar_ismark(g_utf8_get_char(p)))
402    p = g_utf8_find_prev_char(boundary, p);
403
404  return p;
405}
406
407static int oe_char_width(gunichar c, int column)
408{
409  int cw;
410
411  if (c == 9) /* TAB */
412    return TABSIZE - column % TABSIZE;
413
414  cw = mk_wcwidth(c);
415
416  if (cw < 0) /* control characters */
417    cw = 0;
418
419  return cw;
420}
421
422static int oe_find_display_line(owl_editwin *e, int *x, int index)
423{
424  int width = 0, cw;
425  gunichar c;
426  char *p;
427
428  while(1) {
429    /* note the position of the dot */
430    if (x != NULL && index == e->index && width < e->wincols)
431      *x = width;
432
433    /* get the current character */
434    c = g_utf8_get_char(e->buff + index);
435
436    /* figure out how wide it is */
437    cw = oe_char_width(c, width);
438
439    if (width + cw > e->wincols) {
440      if (x != NULL && *x == width)
441        *x = -1;
442      break;
443    }
444    width += cw;
445
446    if (c == '\n') {
447      if (width < e->wincols)
448        ++index; /* skip the newline */
449      break;
450    }
451
452    /* find the next character */
453    p = oe_next_point(e, e->buff + index);
454    if (p == NULL) { /* we ran off the end */
455      if (x != NULL && e->index > index)
456        *x = width + 1;
457      break;
458    }
459    index = p - e->buff;
460
461  }
462  return index;
463}
464
465static void oe_reframe(owl_editwin *e) {
466  oe_excursion x;
467  int goal = e->winlines / 2;
468  int index;
469  int count = 0;
470  int point;
471  int n, i;
472  int last;
473
474  oe_save_excursion(e, &x);
475  /* step back line-by-line through the buffer until we have >= goal lines of
476     display text */
477  e->lock = 0; /* we can (must) tread on the locktext */
478
479  point = e->index;
480  last = -1;
481  while (count < goal) {
482    index = e->index;
483    owl_editwin_move_to_beginning_of_line(e);
484    if (last == e->index)
485      break;
486    last = e->index;
487    for (n = 0, i = e->index; i < index; n++)
488      i = oe_find_display_line(e, NULL, i);
489    count += n == 0 ? 1 : n;
490    if (count < goal)
491      owl_editwin_point_move(e, -1);
492  }
493
494  e->topindex = e->index;
495  /* if we overshot, backtrack */
496  for (n = 0; n < (count - goal); n++)
497    e->topindex = oe_find_display_line(e, NULL, e->topindex);
498
499  oe_restore_excursion(e, &x);
500}
501
502static void oe_addnec(owl_editwin *e, int count)
503{
504  int i;
505
506  for (i = 0; i < count; i++)
507    waddch(e->curswin, e->echochar);
508}
509
510static void oe_mvaddnec(owl_editwin *e, int y, int x, int count)
511{
512  wmove(e->curswin, y, x);
513  oe_addnec(e, count);
514}
515
516/* regenerate the text on the curses window */
517/* if update == 1 then do a doupdate(), otherwise do not */
518void owl_editwin_redisplay(owl_editwin *e, int update)
519{
520  int x = -1, y = -1, t;
521  int line, index, lineindex, times = 0;
522
523  do {
524    werase(e->curswin);
525
526    if (e->topindex == -1 || e->index < e->topindex)
527      oe_reframe(e);
528
529    line = 0;
530    index = e->topindex;
531    while(line < e->winlines) {
532      lineindex = index;
533      t = -1;
534      index = oe_find_display_line(e, &t, lineindex);
535      if (x == -1 && t != -1)
536        x = t, y = line;
537      if (index - lineindex) {
538        if (!e->echochar)
539          mvwaddnstr(e->curswin, line, 0,
540                     e->buff + lineindex,
541                     index - lineindex);
542        else {
543          if(lineindex < e->lock) {
544            mvwaddnstr(e->curswin, line, 0,
545                       e->buff + lineindex,
546                       MIN(index - lineindex,
547                           e->lock - lineindex));
548            if (e->lock < index)
549              oe_addnec(e,
550                        oe_region_width(e, e->lock, index,
551                                        oe_region_width(e, lineindex, e->lock, 0)));
552          } else
553            oe_mvaddnec(e, line, 0, oe_region_width(e, line, index, 0));
554        }
555      }
556      line++;
557    }
558    if (x == -1)
559        e->topindex = -1; /* force a reframe */
560    times++;
561  } while(x == -1 && times < 3);
562
563  wmove(e->curswin, y, x);
564  e->cursorx = x;
565
566  wnoutrefresh(e->curswin);
567  if (update == 1)
568    doupdate();
569}
570
571static inline void oe_fixup(int *target, int start, int end, int change) {
572  if (*target > start) {
573    if (*target < end)
574      *target = end;
575    else
576      *target += change;
577  }
578}
579
580int owl_editwin_replace_region(owl_editwin *e, char *s)
581{
582  oe_excursion x;
583  oe_save_excursion(e, &x);
584  int ret;
585
586  if(e->index > e->mark) {
587    owl_editwin_exchange_point_and_mark(e);
588  }
589
590  ret = owl_editwin_replace_internal(e, e->mark - e->index, s);
591
592  oe_restore_excursion(e, &x);
593
594  return ret;
595}
596
597/* replace 'replace' characters at the point with s, returning the change in size */
598int owl_editwin_replace(owl_editwin *e, int replace, char *s)
599{
600  int start, end, i;
601  char *p;
602
603  if (!g_utf8_validate(s, -1, NULL)) {
604    owl_function_debugmsg("owl_editwin_insert_string: received non-utf-8 string.");
605    return 0;
606  }
607
608  start = e->index;
609  for (i = 0, p = e->buff + start; i < replace && p != NULL; i++)
610    p = oe_next_point(e, p);
611  if (p != NULL)
612    end = p - e->buff;
613  else
614    end = e->bufflen;
615
616  return owl_editwin_replace_internal(e, end - start, s);
617}
618
619static int owl_editwin_replace_internal(owl_editwin *e, int replace, char *s)
620{
621  int start, end, free, need, size, change;
622  oe_excursion *x;
623  char *p;
624
625  start = e->index;
626  end   = start + replace;
627
628  free = e->allocated - e->bufflen + end - start;
629
630  need = strlen(s) - free;
631  if (need > 0) {
632    size = e->allocated + need + INCR - (need % INCR);
633    p = owl_realloc(e->buff, size);
634    if (p == NULL) {
635      /* XXX signal impending doom somehow and don't do anything */
636      return 0;
637    }
638    e->buff = p;
639    e->allocated = size;
640  }
641
642  memmove(e->buff + start + strlen(s), e->buff + end, e->bufflen + 1 - end);
643  memcpy(e->buff + start, s, strlen(s));
644  change = start - end + strlen(s);
645  e->bufflen += change;
646  e->index += strlen(s);
647
648  /* fix up the mark */
649  oe_fixup(&e->mark, start, end, change);
650  oe_fixup(&e->topindex, start, end, change);
651  /* fix up any saved points after the replaced area */
652  for (x = e->excursions; x != NULL; x = x->next) {
653    oe_fixup(&x->index, start, end, change);
654    oe_fixup(&x->mark, start, end, change);
655  }
656
657  return change;
658}
659
660/* linewrap the word just before the cursor.
661 * returns 0 on success
662 * returns -1 if we could not wrap.
663 */
664static void _owl_editwin_linewrap_word(owl_editwin *e)
665{
666  oe_excursion x;
667  gunichar c;
668
669  oe_save_excursion(e, &x);
670
671  while (owl_editwin_point_move(e, -1)) {
672    c = owl_editwin_get_char_at_point(e);
673    if (owl_util_can_break_after(c) || c == '\n') {
674      if (c != '\n')
675        owl_editwin_replace(e, c != ' ' ? 0 : 1, "\n");
676      break;
677    }
678  }
679
680  oe_restore_excursion(e, &x);
681}
682
683/* delete the character at the current point, following chars
684 * shift left.
685 */
686void owl_editwin_delete_char(owl_editwin *e)
687{
688  owl_editwin_replace(e, 1, "");
689}
690
691/* Swap the character at point with the character at point-1 and
692 * advance the pointer.  If point is at beginning of buffer do
693 * nothing.  If point is after the last character swap point-1 with
694 * point-2.  (Behaves as observed in tcsh and emacs).
695 */
696void owl_editwin_transpose_chars(owl_editwin *e)
697{
698  char *middle, *end, *start, *tmp;
699
700  if (e->bufflen == 0) return;
701
702  if (e->index == e->bufflen)
703    owl_editwin_point_move(e, -1);     /* point is after last character */
704
705  if (owl_editwin_at_beginning_of_buffer(e))
706    return;     /* point is at beginning of buffer, do nothing */
707
708  /* Transpose two utf-8 unicode glyphs. */
709  middle = e->buff + e->index;
710
711  end = oe_next_point(e, middle);
712  if (end == NULL)
713    return;
714
715  start = oe_prev_point(e, middle);
716  if (start == NULL)
717    return;
718
719  tmp = owl_malloc((end - start) + 1);
720  tmp[(end - start)] = 0;
721  memcpy(tmp, middle, end - middle);
722  memcpy(tmp + (end - middle), start, middle - start);
723
724  owl_editwin_point_move(e, -1);
725  owl_editwin_replace(e, 2, tmp);
726}
727
728/* insert 'string' at the current point, later text is shifted
729 * right
730 */
731void owl_editwin_insert_string(owl_editwin *e, char *s)
732{
733  owl_editwin_replace(e, 0, s);
734}
735
736/* We assume index is not set to point to a mid-char */
737static gunichar owl_editwin_get_char_at_point(owl_editwin *e)
738{
739  return g_utf8_get_char(e->buff + e->index);
740}
741
742void owl_editwin_exchange_point_and_mark(owl_editwin *e) {
743  int tmp;
744
745  if (e->mark != -1) {
746    tmp = e->mark;
747    owl_editwin_set_mark(e);
748    oe_set_index(e, tmp);
749  }
750}
751
752int owl_editwin_point_move(owl_editwin *e, int delta)
753{
754  char *p;
755  int change, d = 0;
756
757  change = MAX(delta, - delta);
758  p = e->buff + e->index;
759
760  while (d < change && p != NULL) {
761    if (delta > 0)
762      p = oe_next_point(e, p);
763    else
764      p = oe_prev_point(e, p);
765    if (p != NULL) {
766      oe_set_index(e, p - e->buff);
767      d++;
768    }
769  }
770
771  return delta > 0 ? d : -d;
772}
773
774int owl_editwin_at_beginning_of_buffer(owl_editwin *e) {
775  if (e->index == e->lock)
776    return 1;
777
778  return 0;
779}
780
781int owl_at_end_of_buffer(owl_editwin *e) {
782  if (e->index == e->bufflen)
783    return 1;
784
785  return 0;
786}
787
788int owl_editwin_at_beginning_of_line(owl_editwin *e) /*noproto*/
789{
790  oe_excursion x;
791  int ret;
792
793  if (owl_editwin_at_beginning_of_buffer(e))
794    return 1;
795
796  oe_save_excursion(e, &x);
797  owl_editwin_point_move(e, -1);
798  ret = (owl_editwin_get_char_at_point(e) == '\n');
799  oe_restore_excursion(e, &x);
800
801  return ret;
802}
803
804static int owl_editwin_is_char_in(owl_editwin *e, char *set)
805{
806  char *p;
807
808  for (p = set; *p != 0; p = g_utf8_find_next_char(p, NULL))
809    if (owl_editwin_get_char_at_point(e) == g_utf8_get_char(p))
810      return 1;
811  return 0;
812}
813
814int owl_editwin_move_if_in(owl_editwin *e, int delta, char *set)
815{
816  int change, distance = 0;
817  while (owl_editwin_is_char_in(e, set)) {
818    change = owl_editwin_point_move(e, delta);
819    distance += change;
820    if (change == 0)
821      break;
822  }
823  return distance;
824}
825
826int owl_editwin_move_if_not_in(owl_editwin *e, int delta, char *set)
827{
828  int change, distance = 0;
829  while (!owl_editwin_is_char_in(e, set)) {
830    change = owl_editwin_point_move(e, delta);
831    distance += change;
832    if (change == 0)
833      break;
834  }
835  return distance;
836}
837
838int owl_editwin_move_to_beginning_of_line(owl_editwin *e)
839{
840  int distance = 0;
841
842  if (!owl_editwin_at_beginning_of_line(e)) {
843    /* move off the \n if were at the end of a line */
844    distance += owl_editwin_point_move(e, -1);
845    distance += owl_editwin_move_if_not_in(e, -1, "\n");
846    if (distance && !owl_editwin_at_beginning_of_buffer(e))
847      distance += owl_editwin_point_move(e, 1);
848  }
849  e->goal_column = 0; /* subtleties */
850
851  return distance;
852}
853
854int owl_editwin_move_to_end_of_line(owl_editwin *e)
855{
856  return owl_editwin_move_if_not_in(e, 1, "\n");
857}
858
859int owl_editwin_line_move(owl_editwin *e, int delta)
860{
861  int goal_column, change, ll, distance;
862  int count = 0;
863
864  change = MAX(delta, -delta);
865
866  goal_column = e->goal_column;
867  distance = owl_editwin_move_to_beginning_of_line(e);
868  goal_column = goal_column == -1 ? -distance : goal_column;
869
870  while(count < change) {
871    if (delta > 0) {
872      distance += owl_editwin_move_if_not_in(e, 1, "\n");
873      distance += owl_editwin_point_move(e, 1);
874    } else {
875      /* I really want to assert delta < 0 here */
876      distance += owl_editwin_point_move(e, -1); /* to the newline on
877                                                    the previous line */
878      distance += owl_editwin_move_to_beginning_of_line(e);
879    }
880    count++;
881  }
882
883  distance += (ll = owl_editwin_move_to_end_of_line(e));
884  if (ll > goal_column)
885    distance += owl_editwin_point_move(e, goal_column - ll);
886
887  e->goal_column = goal_column;
888
889  return distance;
890}
891
892void owl_editwin_backspace(owl_editwin *e)
893{
894  /* delete the char before the current one
895   * and shift later chars left
896   */
897  if(owl_editwin_point_move(e, -1))
898    owl_editwin_delete_char(e);
899}
900
901void owl_editwin_key_up(owl_editwin *e)
902{
903  owl_editwin_line_move(e, -1);
904}
905
906void owl_editwin_key_down(owl_editwin *e)
907{
908  owl_editwin_line_move(e, 1);
909}
910
911void owl_editwin_key_left(owl_editwin *e)
912{
913  owl_editwin_point_move(e, -1);
914}
915
916void owl_editwin_key_right(owl_editwin *e)
917{
918  owl_editwin_point_move(e, 1);
919}
920
921int owl_editwin_forward_word(owl_editwin *e)
922{
923  int distance;
924  /* if we're starting on a space, find the first non-space */
925  distance = owl_editwin_move_if_in(e, 1, WHITESPACE);
926
927  /* now find the end of this word */
928  distance += owl_editwin_move_if_not_in(e, 1, WHITESPACE);
929
930  return distance;
931}
932
933void owl_editwin_move_to_nextword(owl_editwin *e)
934{
935  owl_editwin_forward_word(e);
936}
937
938/* go backwards to the last non-space character
939 */
940int owl_editwin_backward_word(owl_editwin *e)
941{
942  oe_excursion x;
943  int distance = 0;
944  int further = 0;
945  int beginning;
946  /* if in middle of word, beginning of word */
947
948  /* if at beginning of a word, find beginning of previous word */
949
950  if (owl_editwin_is_char_in(e, WHITESPACE)) {
951    /* if in whitespace past end of word, find a word , the find the beginning*/
952    distance += owl_editwin_move_if_in(e, -1, WHITESPACE); /* leaves us on the last
953                                                              character of the word */
954    oe_save_excursion(e, &x);
955    /* are we at the beginning of a word? */
956    owl_editwin_point_move(e, -1);
957    beginning = owl_editwin_is_char_in(e, WHITESPACE);
958    oe_restore_excursion(e, &x);
959    if (beginning)
960      return distance;
961   } else {
962    /* in the middle of the word; */
963    oe_save_excursion(e, &x);
964    further += owl_editwin_point_move(e, -1);
965    if (owl_editwin_is_char_in(e, WHITESPACE)) { /* we were at the beginning */
966      distance += owl_editwin_backward_word(e); /* previous case */
967      oe_release_excursion(e, &x);
968      return distance + further;
969    } else {
970      oe_restore_excursion(e, &x);
971    }
972  }
973  distance += owl_editwin_move_if_not_in(e, -1, WHITESPACE);
974  /* will go past */
975  if (e->index > e->lock)
976    distance += owl_editwin_point_move(e, 1);
977  return distance;
978}
979
980void owl_editwin_move_to_previousword(owl_editwin *e)
981{
982  owl_editwin_backward_word(e);
983}
984
985void owl_editwin_delete_nextword(owl_editwin *e)
986{
987  oe_excursion x;
988
989  oe_save_excursion(e, &x);
990  oe_set_mark(e, e->index);
991  owl_editwin_forward_word(e);
992  owl_editwin_kill_region(e);
993  oe_restore_mark_only(e, &x);
994}
995
996void owl_editwin_delete_previousword(owl_editwin *e)
997{
998  oe_excursion x;
999
1000  oe_save_excursion(e, &x);
1001  oe_set_mark(e, e->index);
1002  owl_editwin_backward_word(e);
1003  owl_editwin_kill_region(e);
1004  oe_restore_mark_only(e, &x);
1005}
1006
1007void owl_editwin_move_to_line_end(owl_editwin *e)
1008{
1009  owl_editwin_move_to_end_of_line(e);
1010}
1011
1012void owl_editwin_delete_to_endofline(owl_editwin *e)
1013{
1014  oe_excursion x;
1015  int distance;
1016
1017  oe_save_excursion(e, &x);
1018  owl_editwin_set_mark(e);
1019  distance = owl_editwin_move_to_end_of_line(e);
1020  if (distance)
1021    owl_editwin_kill_region(e);
1022  else
1023    owl_editwin_replace(e, 1, "");
1024  oe_restore_excursion(e, &x);
1025}
1026
1027void owl_editwin_yank(owl_editwin *e)
1028{
1029  if (e->killbuf != NULL)
1030    owl_editwin_replace(e, 0, e->killbuf);
1031}
1032
1033static char *oe_copy_buf(owl_editwin *e, char *buf, int len)
1034{
1035  char *p;
1036
1037  p = owl_malloc(len + 1);
1038
1039  if (p != NULL) {
1040    owl_free(e->killbuf);
1041    e->killbuf = p;
1042    memcpy(e->killbuf, buf, len);
1043    e->killbuf[len] = 0;
1044  }
1045
1046  return p;
1047}
1048
1049static int oe_copy_region(owl_editwin *e)
1050{
1051  char *p;
1052  int start, end;
1053
1054  if (e->mark == -1)
1055    return 0;
1056
1057  start = MIN(e->index, e->mark);
1058  end = MAX(e->index, e->mark);
1059
1060  p = oe_copy_buf(e, e->buff + start, end - start);
1061  if (p != NULL)
1062    return end - start;
1063  return 0;
1064}
1065
1066void owl_editwin_copy_region_as_kill(owl_editwin *e)
1067{
1068  oe_copy_region(e);
1069}
1070
1071void owl_editwin_kill_region(owl_editwin *e)
1072{
1073  if (e->index > e->mark)
1074    owl_editwin_exchange_point_and_mark(e);
1075
1076  owl_editwin_replace(e, oe_copy_region(e), "");
1077}
1078
1079void owl_editwin_move_to_line_start(owl_editwin *e)
1080{
1081  owl_editwin_move_to_beginning_of_line(e);
1082}
1083
1084void owl_editwin_move_to_end(owl_editwin *e)
1085{
1086  oe_set_index(e, e->bufflen);
1087}
1088
1089void owl_editwin_move_to_top(owl_editwin *e)
1090{
1091  oe_set_index(e, e->lock);
1092}
1093
1094void owl_editwin_backward_paragraph(owl_editwin *e)
1095{
1096  owl_editwin_point_move(e, -1);
1097  for (; e->index >= e->lock; owl_editwin_point_move(e, -1)) {
1098    if (e->index <= e->lock ||
1099        ((e->buff[e->index] == '\n') && (e->buff[e->index - 1]=='\n')))
1100      break;
1101  }
1102}
1103
1104void owl_editwin_forward_paragraph(owl_editwin *e)
1105{
1106  owl_editwin_point_move(e, 1);
1107  /* scan forward to the start of the next paragraph */
1108  for(; e->index < e->bufflen; owl_editwin_point_move(e, 1)) {
1109    if (e->buff[e->index -1] == '\n' && e->buff[e->index] == '\n')
1110      break;
1111  }
1112}
1113
1114int owl_editwin_current_column(owl_editwin *e)
1115{
1116  oe_excursion x;
1117  int lineindex;
1118
1119  oe_save_excursion(e, &x);
1120  owl_editwin_move_to_beginning_of_line(e);
1121  lineindex = e->index;
1122  oe_restore_excursion(e, &x);
1123  return oe_region_width(e, lineindex, e->index, 0);
1124}
1125
1126void owl_editwin_fill_paragraph(owl_editwin *e)
1127{
1128  oe_excursion x;
1129  gunichar ch;
1130  int sentence;
1131
1132  oe_save_excursion(e, &x);
1133
1134  /* Mark the end of the paragraph */
1135  owl_editwin_forward_paragraph(e);
1136  /* Skip the trailing newline */
1137  owl_editwin_point_move(e, -1);
1138  owl_editwin_set_mark(e);
1139
1140  owl_editwin_backward_paragraph(e);
1141
1142  /* Don't mess with the leading newline */
1143  if (owl_editwin_get_char_at_point(e) == '\n')
1144    owl_editwin_point_move(e, 1);
1145
1146  /*
1147   * First pass: Scan forward replacing all series of spaces with ' '
1148   * (or nothing after CJK ideograms)
1149   */
1150  sentence = 0;
1151  for(;e->index < e->mark; owl_editwin_point_move(e, 1)) {
1152    /* bail if we hit a trailing dot on the buffer */
1153    if (strcmp(e->buff + e->index, "\n.") == 0) {
1154      owl_editwin_set_mark(e);
1155      break;
1156    }
1157
1158    ch = owl_editwin_get_char_at_point(e);
1159
1160    if (owl_util_can_break_after(ch) || ch == '\n') {
1161      if (g_unichar_isspace(ch)) {
1162        owl_editwin_replace(e, 1, " ");
1163      }
1164
1165      if (sentence && g_unichar_isspace(owl_editwin_get_char_at_point(e)))
1166        owl_editwin_point_move(e, 1);
1167
1168      while(g_unichar_isspace(owl_editwin_get_char_at_point(e))
1169            && e->index < e->mark) {
1170        owl_editwin_delete_char(e);
1171      }
1172    }
1173
1174    if(ch == '.' || ch == '!' || ch == '?')
1175      sentence = 1;
1176    else
1177      sentence = 0;
1178  }
1179
1180  owl_editwin_backward_paragraph(e);
1181
1182  /* Now go through inserting newlines as needed */
1183  while(e->index < e->mark) {
1184    /* if we've travelled too far, linewrap */
1185    if (owl_editwin_current_column(e) >= e->fillcol)
1186      _owl_editwin_linewrap_word(e);
1187    owl_editwin_point_move(e, 1);
1188  }
1189
1190  oe_restore_excursion(e, &x);
1191}
1192
1193/* returns true if only whitespace remains */
1194int owl_editwin_is_at_end(owl_editwin *e)
1195{
1196  return (only_whitespace(e->buff + e->index));
1197}
1198
1199static int owl_editwin_check_dotsend(owl_editwin *e)
1200{
1201  int zdot;
1202  oe_excursion x;
1203
1204  if (!e->dotsend) return(0);
1205  if (e->index != e->bufflen) return (0);
1206
1207  oe_save_excursion(e, &x);
1208
1209  owl_editwin_point_move(e, -3);
1210
1211  zdot = (strcmp(e->buff + e->index, "\n.\n") == 0);
1212
1213  oe_restore_excursion(e, &x);
1214
1215  return zdot;
1216}
1217
1218void owl_editwin_post_process_char(owl_editwin *e, owl_input j)
1219{
1220  /* XXX force a redisplay? */
1221  if ((j.ch==13 || j.ch==10) && owl_editwin_check_dotsend(e)) {
1222    owl_command_edit_done(e);
1223    return;
1224  }
1225  owl_editwin_redisplay(e, 0);
1226}
1227
1228static int oe_region_width(owl_editwin *e, int start, int end, int offset)
1229{
1230  char *p;
1231  int width = offset;
1232 
1233  for(p = e->buff + start;
1234      p < e->buff + end;
1235      p = g_utf8_find_next_char(p, NULL))
1236    width += oe_char_width(g_utf8_get_char(p), width);
1237
1238  return width - offset;
1239}
1240
1241static void oe_insert_char(owl_editwin *e, gunichar c)
1242{
1243  oe_excursion x;
1244  char tmp[7];
1245  int replaced = -1;
1246
1247  if (c == '\r') /* translate CRs to NLs */
1248    c = '\n';
1249
1250  if (!g_unichar_iscntrl(c) || c == '\n' || c== '\t' ) {
1251    memset(tmp, 0, 7);
1252
1253    if (c == '\n' && e->style == OWL_EDITWIN_STYLE_ONELINE) {
1254      return;
1255    }
1256
1257    if (e->cursorx != -1 && e->cursorx + oe_char_width(c, e->cursorx) > e->wrapcol) {
1258      /* XXX this is actually wrong:
1259       * + If the line has been been wrapped, we can be past the wrap column but
1260       *   e->cursorx be much smaller.
1261       * + If the user went back and inserted a bunch of stuff in the middle of
1262       *   the line, there may be more than one word past the wrap column.
1263       */
1264      oe_save_excursion(e, &x);
1265
1266      if (c == ' ' || c == '\t') {
1267        owl_editwin_point_move(e, -1);
1268        replaced = -owl_editwin_move_if_in(e, -1, " \t");
1269        if (!replaced) {
1270          c = '\n';
1271          replaced = -1;
1272        }
1273      } else {
1274        while(!owl_editwin_at_beginning_of_line(e)) {
1275          owl_editwin_point_move(e, -1);
1276          if (owl_util_can_break_after(owl_editwin_get_char_at_point(e))) {
1277            replaced = -owl_editwin_move_if_in(e, -1, " \t");
1278            break;
1279          }
1280        }
1281        if (owl_editwin_at_beginning_of_line(e))
1282          replaced = -1;
1283      }
1284      if (replaced && !owl_editwin_at_beginning_of_line(e))
1285        owl_editwin_point_move(e, 1);
1286      if (replaced >= 0) {
1287        owl_editwin_replace(e, replaced, "\n");
1288      }
1289      oe_restore_excursion(e, &x);
1290    }
1291
1292    if (replaced >= 0 && (c == ' ' || c == '\t'))
1293      return; /* our work here is done */
1294
1295    g_unichar_to_utf8(c, tmp);
1296    owl_editwin_replace(e, 0, tmp);
1297  }
1298}
1299
1300void owl_editwin_process_char(owl_editwin *e, owl_input j)
1301{
1302  if (j.ch == ERR)
1303    return;
1304  /* Ignore ncurses control characters. */
1305  if (j.ch < 0x100) {
1306    oe_insert_char(e, j.uch);
1307  }
1308}
1309
1310char *owl_editwin_get_text(owl_editwin *e)
1311{
1312  return(e->buff+e->lock);
1313}
1314
1315char *owl_editwin_get_region(owl_editwin *e)
1316{
1317  int start, end;
1318  start = e->index;
1319  end   = e->mark;
1320  if(start > end) {
1321    int tmp = end;
1322    end = start;
1323    start = tmp;
1324  }
1325
1326  return oe_chunk(e, start, end);
1327}
1328
1329int owl_editwin_get_echochar(owl_editwin *e)
1330{
1331  return e->echochar;
1332}
1333
1334static char *oe_chunk(owl_editwin *e, int start, int end)
1335{
1336  char *p;
1337 
1338  p = owl_malloc(end - start + 1);
1339  memcpy(p, e->buff + start, end - start);
1340  p[end - start] = 0;
1341
1342  return p;
1343}
1344
1345/*
1346 * The only guarantee made about these values is that comparisons
1347 * between them, as well as comparison between multiple calls to these
1348 * functions without modifying the editwin in-between, are meaningful.
1349 */
1350
1351int owl_editwin_get_point(owl_editwin *e)
1352{
1353  return e->index;
1354}
1355
1356int owl_editwin_get_mark(owl_editwin *e)
1357{
1358  return e->mark;
1359}
1360
1361
1362/*
1363 * Local Variables:
1364 * mode:C
1365 * c-basic-offset:2
1366 * End:
1367 */
Note: See TracBrowser for help on using the repository browser.