source: editwin.c @ fc2677b

release-1.4release-1.5release-1.6release-1.7release-1.8release-1.9
Last change on this file since fc2677b was fc2677b, checked in by Nelson Elhage <nelhage@mit.edu>, 12 years ago
editwin: Clean up and fix owl_editwin_fill_paragraph We now implement a two-pass algorithm, that first replaces all whitespace with single spaces, and then goes through and inserts newlines as necessary to fill words. The code is slightly longer, but I think much cleaner.
  • Property mode set to 100644
File size: 27.7 KB
RevLine 
[7d4fbcd]1#include "owl.h"
2#include <stdlib.h>
3#include <unistd.h>
4#include <string.h>
[10b866d]5#include <ctype.h>
[7d4fbcd]6
[1aee7d9]7static const char fileIdent[] = "$Id$";
8
[ebf0128]9#define VALID_EXCURSION (0x9a2b4729)
10
11typedef struct oe_excursion_struct { /*noproto*/
12  int valid;
13  int index;
[16cfd12a]14  int mark;
[ebf0128]15  int goal_column;
16  int lock;
17  struct oe_excursion_struct *next;
18} oe_excursion;
19
[a556caa]20struct _owl_editwin { /*noproto*/
21  char *buff;
22  owl_history *hist;
23  int bufflen;
24  int allocated;
25  int index;
[16cfd12a]26  int mark;
[a60edf2]27  char *killbuf;
[a556caa]28  int goal_column;
29  int topindex;
[ebf0128]30  int cursorx;
[a556caa]31  int winlines, wincols, fillcol, wrapcol;
32  WINDOW *curswin;
33  int style;
34  int lock;
35  int dotsend;
36  int echochar;
[ebf0128]37  oe_excursion *excursions;
[a556caa]38
39  char *command;
40  void (*callback)(struct _owl_editwin*);
41  void *cbdata;
42};
43
[e20d8179]44static void oe_reframe(owl_editwin *e);
[bab52da]45static void oe_save_excursion(owl_editwin *e, oe_excursion *x);
[ebf0128]46static void oe_release_excursion(owl_editwin *e, oe_excursion *x);
[bab52da]47static void oe_restore_excursion(owl_editwin *e, oe_excursion *x);
[a60edf2]48static void oe_restore_mark_only(owl_editwin *e, oe_excursion *x);
[ebf0128]49static int oe_count_glyphs(char *s);
50static int oe_char_width(gunichar c, int column);
[16cfd12a]51static int oe_region_width(owl_editwin *e, int start, int end, int width);
[bab52da]52static int oe_find_display_line(owl_editwin *e, int *x, int index);
[ebf0128]53static void oe_insert_char(owl_editwin *e, gunichar c);
[bab52da]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);
[ebf0128]58static int owl_editwin_replace(owl_editwin *e, int count, char *s);
[a60edf2]59static char *oe_copy_buf(owl_editwin *e, char *buf, int len);
60static int oe_copy_region(owl_editwin *e);
[fc2677b]61static int oe_display_column(owl_editwin *e);
[bab52da]62
[5b5f3e6]63#define INCR 4096
[7d4fbcd]64
[a556caa]65#define WHITESPACE " \n\t"
66
[bab52da]67owl_editwin *owl_editwin_allocate(void)
68{
[8321cb7]69  owl_editwin *e;
70  e = owl_malloc(sizeof(owl_editwin));
71  memset(e, 0, sizeof(*e));
72  return e;
[a556caa]73}
74
[5b5f3e6]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
[bab52da]87static inline void oe_set_index(owl_editwin *e, int index)
88{
[ebf0128]89  if (index != e->index) {
90    e->goal_column = -1;
91    e->cursorx = -1;
92  }
[521bc84]93  e->index = index;
94}
95
[7f0c26f]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
[cf83b7a]107/* initialize the editwin e.
108 * 'win' is an already initialzed curses window that will be used by editwin
109 */
[c9334b1]110void owl_editwin_init(owl_editwin *e, WINDOW *win, int winlines, int wincols, int style, owl_history *hist)
111{
[e20d8179]112  e->buff=owl_malloc(INCR);
[7d4fbcd]113  e->buff[0]='\0';
114  e->bufflen=0;
[10b866d]115  e->hist=hist;
[7d4fbcd]116  e->allocated=INCR;
[521bc84]117  oe_set_index(e, 0);
[7f0c26f]118  oe_set_mark(e, -1);
[a60edf2]119  if (e->killbuf != NULL)
120    free(e->killbuf);
121  e->killbuf = NULL;
[a556caa]122  e->goal_column = -1;
[ebf0128]123  e->cursorx = -1;
124  e->topindex = 0;
125  e->excursions = NULL;
126  owl_editwin_set_curswin(e, win, winlines, wincols);
[7d4fbcd]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;
[c9334b1]134  e->echochar='\0';
[e74c01c]135
[af1920fd]136  /* We get initialized multiple times, but we need to hold on to
137     the callbacks, so we can't NULL them here. */
[e74c01c]138  /*
139    e->command = NULL;
140    e->callback = NULL;
141    e->cbdata = NULL;
142  */
[7d4fbcd]143  if (win) werase(win);
144}
145
[c9334b1]146void owl_editwin_set_curswin(owl_editwin *e, WINDOW *w, int winlines, int wincols)
147{
[7d4fbcd]148  e->curswin=w;
149  e->winlines=winlines;
150  e->wincols=wincols;
[9a6cc40]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));
[7d4fbcd]153}
154
[c9334b1]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{
[060b3b4]166  return(e->curswin);
[7d4fbcd]167}
168
[c9334b1]169owl_history *owl_editwin_get_history(owl_editwin *e)
170{
[060b3b4]171  return(e->hist);
[10b866d]172}
173
[c9334b1]174void owl_editwin_set_dotsend(owl_editwin *e)
175{
[7d4fbcd]176  e->dotsend=1;
177}
178
[bab52da]179void owl_editwin_set_command(owl_editwin *e, char *command)
180{
[e74c01c]181  if(e->command) owl_free(e->command);
182  e->command = owl_strdup(command);
183}
184
[bab52da]185char *owl_editwin_get_command(owl_editwin *e)
186{
[e74c01c]187  if(e->command) return e->command;
188  return "";
189}
190
[bab52da]191void owl_editwin_set_callback(owl_editwin *e, void (*cb)(owl_editwin*))
192{
[e74c01c]193  e->callback = cb;
194}
195
[bab52da]196void (*owl_editwin_get_callback(owl_editwin *e))(owl_editwin*)
197{
[e74c01c]198  return e->callback;
199}
200
[bab52da]201void owl_editwin_set_cbdata(owl_editwin *e, void *data)
202{
[e74c01c]203  e->cbdata = data;
204}
205
[a556caa]206void *owl_editwin_get_cbdata(owl_editwin *e) {
[e74c01c]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 {
[af1920fd]216    /* owl_function_error("text: |%s|", owl_editwin_get_text(e)); */
[e74c01c]217    cb(e);
218  }
219}
220
[bab52da]221static int owl_editwin_limit_maxcols(int v, int maxv)
[c9334b1]222{
[ebf0128]223  /* maxv > 5 ? MAX(v, vax) : v */
[d36f2cb]224  if (maxv > 5 && v > maxv) {
[060b3b4]225    return(maxv);
[d36f2cb]226  } else {
[060b3b4]227    return(v);
[d36f2cb]228  }
229}
230
[c9334b1]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{
[521bc84]236  oe_set_index(e, 0);
[5b5f3e6]237  e->lock = 0;
238  owl_editwin_replace(e, e->bufflen, text);
239  e->buff[e->bufflen] = 0;
240  e->lock=e->bufflen;
[521bc84]241  oe_set_index(e, e->lock);
[7d4fbcd]242  owl_editwin_redisplay(e, 0);
243}
244
[c9334b1]245int owl_editwin_get_style(owl_editwin *e)
246{
[7d4fbcd]247  return(e->style);
248}
249
[c9334b1]250void owl_editwin_new_style(owl_editwin *e, int newstyle, owl_history *h)
251{
[98f1e69]252  e->hist = h;
253
[7d4fbcd]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 */
[5b5f3e6]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),  "");
[7d4fbcd]265  }
266}
267
[c9334b1]268/* completly reinitialize the buffer */
269void owl_editwin_fullclear(owl_editwin *e)
270{
[7d4fbcd]271  owl_free(e->buff);
[10b866d]272  owl_editwin_init(e, e->curswin, e->winlines, e->wincols, e->style, e->hist);
[7d4fbcd]273}
274
[c9334b1]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
[6073462]281  int lock = e->lock;
[10b866d]282  int dotsend=e->dotsend;
[7d4fbcd]283  char *locktext=NULL;
[cc6f009]284  char echochar=e->echochar;
[10b866d]285
[6073462]286  if (lock > 0) {
[5b5f3e6]287    locktext = owl_malloc(lock+1);
288    strncpy(locktext, e->buff, lock);
289    locktext[lock] = 0;
[7d4fbcd]290  }
291
292  owl_free(e->buff);
[10b866d]293  owl_editwin_init(e, e->curswin, e->winlines, e->wincols, e->style, e->hist);
[7d4fbcd]294
295  if (lock > 0) {
296    owl_editwin_set_locktext(e, locktext);
297  }
[10b866d]298  if (dotsend) {
299    owl_editwin_set_dotsend(e);
300  }
[cc6f009]301  if (echochar) {
302    owl_editwin_set_echochar(e, echochar);
303  }
[7d4fbcd]304
[5b5f3e6]305  if (locktext)
306    owl_free(locktext);
[6073462]307
[521bc84]308  oe_set_index(e, lock);
[7d4fbcd]309}
310
[c9334b1]311void owl_editwin_recenter(owl_editwin *e)
312{
[a556caa]313  e->topindex = -1;
314}
[e20d8179]315
[a0fbdee]316static void oe_save_excursion(owl_editwin *e, oe_excursion *x)
317{
318  x->index = e->index;
[7f0c26f]319  x->mark = e->mark;
[a0fbdee]320  x->goal_column = e->goal_column;
321  x->lock = e->lock;
[ebf0128]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  }
[a0fbdee]345}
346
347static void oe_restore_excursion(owl_editwin *e, oe_excursion *x)
348{
[ebf0128]349  if (x->valid == VALID_EXCURSION) {
350    oe_set_index(e, x->index);
351    e->goal_column = x->goal_column;
[7f0c26f]352    e->mark = x->mark;
[ebf0128]353    e->lock = x->lock;
354
355    oe_release_excursion(e, x);
356  }
[a0fbdee]357}
358
[a60edf2]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
[e20d8179]368static inline char *oe_next_point(owl_editwin *e, char *p)
369{
370  char *boundary = e->buff + e->bufflen + 1;
371  char *q;
372
373  q = g_utf8_find_next_char(p, boundary);
374  while (q && g_unichar_ismark(g_utf8_get_char(q)))
375    q = g_utf8_find_next_char(q, boundary);
376
377  if (q == p)
378    return NULL;
379  return q;
380}
381
382static inline char *oe_prev_point(owl_editwin *e, char *p)
383{
384  char *boundary = e->buff + e->lock;
385
386  p = g_utf8_find_prev_char(boundary, p);
387  while (p && g_unichar_ismark(g_utf8_get_char(p)))
388    p = g_utf8_find_prev_char(boundary, p);
389
390  return p;
391}
392
[ebf0128]393static int oe_char_width(gunichar c, int column)
394{
395  int cw;
396
397  if (c == 9) /* TAB */
398    return TABSIZE - column % TABSIZE;
399
400  cw = mk_wcwidth(c);
401
402  if (cw < 0) /* control characters */
403    cw = 0;
404
405  return cw;
406}
407
[19f765d]408static int oe_find_display_line(owl_editwin *e, int *x, int index)
409{
410  int width = 0, cw;
[ebf0128]411  gunichar c;
[19f765d]412  char *p;
413
[77d4402]414  while(1) {
415    /* note the position of the dot */
[2021bea]416    if (x != NULL && index == e->index && width < e->wincols)
[19f765d]417      *x = width;
[77d4402]418
[19f765d]419    /* get the current character */
420    c = g_utf8_get_char(e->buff + index);
421
422    /* figure out how wide it is */
[ebf0128]423    cw = oe_char_width(c, width);
[19f765d]424
[77d4402]425    if (width + cw > e->wincols) {
426      if (x != NULL && *x == width)
427        *x = -1;
[19f765d]428      break;
[77d4402]429    }
[19f765d]430    width += cw;
431
432    if (c == '\n') {
[77d4402]433      if (width < e->wincols)
434        ++index; /* skip the newline */
[19f765d]435      break;
436    }
437
438    /* find the next character */
439    p = oe_next_point(e, e->buff + index);
440    if (p == NULL) { /* we ran off the end */
441      if (x != NULL && e->index > index)
442        *x = width + 1;
443      break;
444    }
445    index = p - e->buff;
[cedc95c]446
[19f765d]447  }
448  return index;
449}
450
[e20d8179]451static void oe_reframe(owl_editwin *e) {
[cedc95c]452  oe_excursion x;
453  int goal = e->winlines / 2;
454  int index;
455  int count = 0;
456  int point;
457  int n, i;
458  int last;
459
460  oe_save_excursion(e, &x);
461  /* step back line-by-line through the buffer until we have >= goal lines of
462     display text */
463  e->lock = 0; /* we can (must) tread on the locktext */
464
465  point = e->index;
466  last = -1;
467  while (count < goal) {
468    index = e->index;
469    owl_editwin_move_to_beginning_of_line(e);
470    if (last == e->index)
471      break;
472    last = e->index;
473    for (n = 0, i = e->index; i < index; n++)
474      i = oe_find_display_line(e, NULL, i);
475    count += n == 0 ? 1 : n;
476    if (count < goal)
477      owl_editwin_point_move(e, -1);
478  }
479
480  e->topindex = e->index;
[521bc84]481  /* if we overshot, backtrack */
482  for (n = 0; n < (count - goal); n++)
483    e->topindex = oe_find_display_line(e, NULL, e->topindex);
[cedc95c]484
485  oe_restore_excursion(e, &x);
[7d4fbcd]486}
487
[c9334b1]488/* regenerate the text on the curses window */
489/* if update == 1 then do a doupdate(), otherwise do not */
490void owl_editwin_redisplay(owl_editwin *e, int update)
491{
[19f765d]492  int x = -1, y = -1, t;
[77d4402]493  int line, index, lineindex, times = 0;
[7d4fbcd]494
[bd1a1ae]495  do {
[cedc95c]496    werase(e->curswin);
497
[bd1a1ae]498    if (e->topindex == -1 || e->index < e->topindex)
[e20d8179]499      oe_reframe(e);
500
[bd1a1ae]501    line = 0;
502    index = e->topindex;
503    while(line < e->winlines) {
504      lineindex = index;
[19f765d]505      t = -1;
506      index = oe_find_display_line(e, &t, lineindex);
507      if (x == -1 && t != -1)
508        x = t, y = line;
[bd1a1ae]509      if (index - lineindex)
510        mvwaddnstr(e->curswin, line, 0,
511                   e->buff + lineindex,
512                   index - lineindex);
513      line++;
[a556caa]514    }
[19f765d]515    if (x == -1)
[bd1a1ae]516        e->topindex = -1; /* force a reframe */
[77d4402]517    times++;
518  } while(x == -1 && times < 3);
[e20d8179]519
[19f765d]520  wmove(e->curswin, y, x);
[ebf0128]521  e->cursorx = x;
522
[7d4fbcd]523  wnoutrefresh(e->curswin);
[a556caa]524  if (update == 1)
[7d4fbcd]525    doupdate();
526}
527
[7f0c26f]528static inline void oe_fixup(int *target, int start, int end, int change) {
529  if (*target > start) {
530    if (*target < end)
531      *target = end;
532    else
533      *target += change;
534  }
535}
536
[ebf0128]537/* replace count characters at the point with s, returning the change in size */
538static int owl_editwin_replace(owl_editwin *e, int replace, char *s)
539{
540  int start, end, i, free, need, size, change;
[5b5f3e6]541  char *p;
[ebf0128]542  oe_excursion *x;
[e9bb404]543
[5b5f3e6]544  if (!g_utf8_validate(s, -1, NULL)) {
545    owl_function_debugmsg("owl_editwin_insert_string: received non-utf-8 string.");
[ebf0128]546    return 0;
[47519e1b]547  }
548
[5b5f3e6]549  start = e->index;
550  for (i = 0, p = e->buff + start; i < replace && p != NULL; i++)
551    p = oe_next_point(e, p);
552  if (p != NULL)
553    end = p - e->buff;
554  else
555    end = e->bufflen;
556
557  free = e->allocated - e->bufflen + end - start;
558
559  need = strlen(s) - free;
560  if (need > 0) {
561    size = e->allocated + need + INCR - (need % INCR);
[a60edf2]562    p = owl_realloc(e->buff, size);
[5b5f3e6]563    if (p == NULL) {
564      /* XXX signal impending doom somehow and don't do anything */
[ebf0128]565      return 0;
[e9bb404]566    }
[5b5f3e6]567    e->buff = p;
568    e->allocated = size;
[47519e1b]569  }
[e9bb404]570
[5b5f3e6]571  memmove(e->buff + start + strlen(s), e->buff + end, e->bufflen + 1 - end);
572  memcpy(e->buff + start, s, strlen(s));
[ebf0128]573  change = start - end + strlen(s);
574  e->bufflen += change;
[5b5f3e6]575  e->index += strlen(s);
[ebf0128]576
[7f0c26f]577  /* fix up the mark */
578  if (e->mark != -1)
579    oe_fixup(&e->mark, start, end, change);
[ebf0128]580  /* fix up any saved points after the replaced area */
[7f0c26f]581  for (x = e->excursions; x != NULL; x = x->next) {
582    oe_fixup(&x->index, start, end, change);
583    if (x->mark != -1)
584      oe_fixup(&x->mark, start, end, change);
585  }
[ebf0128]586
587  return change;
[47519e1b]588}
589
[c9334b1]590/* linewrap the word just before the cursor.
591 * returns 0 on success
592 * returns -1 if we could not wrap.
593 */
[fc2677b]594static void _owl_editwin_linewrap_word(owl_editwin *e)
[c9334b1]595{
[fc2677b]596  oe_excursion x;
[84027015]597  gunichar c;
[7d4fbcd]598
[fc2677b]599  oe_save_excursion(e, &x);
[84027015]600
[fc2677b]601  while (owl_editwin_point_move(e, -1)) {
602    c = owl_editwin_get_char_at_point(e);
603    if (owl_util_can_break_after(c) || c == '\n') {
604      if (c != '\n')
605        owl_editwin_replace(e, c != ' ' ? 0 : 1, "\n");
606      break;
[2d4ff14]607    }
[7d4fbcd]608  }
[fc2677b]609
610  oe_restore_excursion(e, &x);
[7d4fbcd]611}
612
[c9334b1]613/* delete the character at the current point, following chars
614 * shift left.
[e20d8179]615 */
[c9334b1]616void owl_editwin_delete_char(owl_editwin *e)
617{
[5b5f3e6]618  owl_editwin_replace(e, 1, "");
[7d4fbcd]619}
620
[c9334b1]621/* Swap the character at point with the character at point-1 and
622 * advance the pointer.  If point is at beginning of buffer do
623 * nothing.  If point is after the last character swap point-1 with
[e20d8179]624 * point-2.  (Behaves as observed in tcsh and emacs).
[c9334b1]625 */
626void owl_editwin_transpose_chars(owl_editwin *e)
627{
[5b5f3e6]628  char *middle, *end, *start, *tmp;
[f2e36b5]629
[47519e1b]630  if (e->bufflen == 0) return;
[e20d8179]631
[5b5f3e6]632  if (e->index == e->bufflen)
633    owl_editwin_point_move(e, -1);     /* point is after last character */
[f2e36b5]634
[5b5f3e6]635  if (owl_editwin_at_beginning_of_buffer(e))
636    return;     /* point is at beginning of buffer, do nothing */
[f2e36b5]637
[47519e1b]638  /* Transpose two utf-8 unicode glyphs. */
[5b5f3e6]639  middle = e->buff + e->index;
[47519e1b]640
[5b5f3e6]641  end = oe_next_point(e, middle);
642  if (end == NULL)
[e20d8179]643    return;
[47519e1b]644
[5b5f3e6]645  start = oe_prev_point(e, middle);
646  if (start == NULL)
[e20d8179]647    return;
[47519e1b]648
[5b5f3e6]649  tmp = owl_malloc((end - start) + 1);
650  tmp[(end - start)] = 0;
651  memcpy(tmp, middle, end - middle);
652  memcpy(tmp + (end - middle), start, middle - start);
653
654  owl_editwin_point_move(e, -1);
655  owl_editwin_replace(e, 2, tmp);
[f2e36b5]656}
657
[c9334b1]658/* insert 'string' at the current point, later text is shifted
659 * right
660 */
[5b5f3e6]661void owl_editwin_insert_string(owl_editwin *e, char *s)
[c9334b1]662{
[5b5f3e6]663  owl_editwin_replace(e, 0, s);
[7d4fbcd]664}
665
[a556caa]666/* We assume index is not set to point to a mid-char */
[bab52da]667static gunichar owl_editwin_get_char_at_point(owl_editwin *e)
[c9334b1]668{
[a556caa]669  return g_utf8_get_char(e->buff + e->index);
670}
[7d4fbcd]671
[7f0c26f]672void owl_editwin_exchange_point_and_mark(owl_editwin *e) {
673  int tmp;
674
675  if (e->mark != -1) {
676    tmp = e->mark;
677    owl_editwin_set_mark(e);
678    oe_set_index(e, tmp);
679  }
680}
681
[e20d8179]682int owl_editwin_point_move(owl_editwin *e, int delta)
[84027015]683{
[e20d8179]684  char *p;
[19f765d]685  int change, d = 0;
[a556caa]686
687  change = MAX(delta, - delta);
688  p = e->buff + e->index;
689
690  while (d < change && p != NULL) {
[e20d8179]691    if (delta > 0)
692      p = oe_next_point(e, p);
693    else
694      p = oe_prev_point(e, p);
695    if (p != NULL) {
[521bc84]696      oe_set_index(e, p - e->buff);
[e20d8179]697      d++;
[a556caa]698    }
699  }
700
701  return delta > 0 ? d : -d;
[84027015]702}
703
[a556caa]704int owl_editwin_at_beginning_of_buffer(owl_editwin *e) {
705  if (e->index == e->lock)
706    return 1;
[84027015]707
[a556caa]708  return 0;
709}
710
711int owl_at_end_of_buffer(owl_editwin *e) {
712  if (e->index == e->bufflen)
713    return 1;
714
715  return 0;
716}
717
718int owl_editwin_at_beginning_of_line(owl_editwin *e) /*noproto*/
[c9334b1]719{
[a0fbdee]720  oe_excursion x;
[a556caa]721  int ret;
[47519e1b]722
[a556caa]723  if (owl_editwin_at_beginning_of_buffer(e))
724    return 1;
[47519e1b]725
[a0fbdee]726  oe_save_excursion(e, &x);
[a556caa]727  owl_editwin_point_move(e, -1);
[bab52da]728  ret = (owl_editwin_get_char_at_point(e) == '\n');
[a0fbdee]729  oe_restore_excursion(e, &x);
[a556caa]730
731  return ret;
732}
733
[e20d8179]734static int owl_editwin_is_char_in(owl_editwin *e, char *set)
[a556caa]735{
736  char *p;
[5b5f3e6]737
738  for (p = set; *p != 0; p = g_utf8_find_next_char(p, NULL))
739    if (owl_editwin_get_char_at_point(e) == g_utf8_get_char(p))
[a556caa]740      return 1;
741  return 0;
742}
743
[e20d8179]744int owl_editwin_move_if_in(owl_editwin *e, int delta, char *set)
[a556caa]745{
746  int change, distance = 0;
[e20d8179]747  while (owl_editwin_is_char_in(e, set)) {
[a556caa]748    change = owl_editwin_point_move(e, delta);
749    distance += change;
750    if (change == 0)
751      break;
[47519e1b]752  }
[a556caa]753  return distance;
754}
755
[e20d8179]756int owl_editwin_move_if_not_in(owl_editwin *e, int delta, char *set)
[a556caa]757{
758  int change, distance = 0;
[e20d8179]759  while (!owl_editwin_is_char_in(e, set)) {
[a556caa]760    change = owl_editwin_point_move(e, delta);
761    distance += change;
762    if (change == 0)
763      break;
[7d4fbcd]764  }
[a556caa]765  return distance;
[7d4fbcd]766}
767
[e20d8179]768int owl_editwin_move_to_beginning_of_line(owl_editwin *e)
[47519e1b]769{
[a556caa]770  int distance = 0;
[47519e1b]771
[a556caa]772  if (!owl_editwin_at_beginning_of_line(e)) {
773    /* move off the \n if were at the end of a line */
774    distance += owl_editwin_point_move(e, -1);
775    distance += owl_editwin_move_if_not_in(e, -1, "\n");
776    if (distance && !owl_editwin_at_beginning_of_buffer(e))
777      distance += owl_editwin_point_move(e, 1);
[47519e1b]778  }
[77d4402]779  e->goal_column = 0; /* subtleties */
[84027015]780
[a556caa]781  return distance;
782}
[e20d8179]783
784int owl_editwin_move_to_end_of_line(owl_editwin *e)
[a556caa]785{
786  return owl_editwin_move_if_not_in(e, 1, "\n");
[47519e1b]787}
788
[e20d8179]789int owl_editwin_line_move(owl_editwin *e, int delta)
[c9334b1]790{
[d7043b4]791  int goal_column, change, ll, distance;
792  int count = 0;
[a556caa]793
794  change = MAX(delta, -delta);
795
[d7043b4]796  goal_column = e->goal_column;
797  distance = owl_editwin_move_to_beginning_of_line(e);
798  goal_column = goal_column == -1 ? -distance : goal_column;
[a556caa]799
800  while(count < change) {
801    if (delta > 0) {
802      distance += owl_editwin_move_if_not_in(e, 1, "\n");
803      distance += owl_editwin_point_move(e, 1);
804    } else {
805      /* I really want to assert delta < 0 here */
806      distance += owl_editwin_point_move(e, -1); /* to the newline on
807                                                    the previous line */
808      distance += owl_editwin_move_to_beginning_of_line(e);
809    }
810    count++;
[7d4fbcd]811  }
[a556caa]812
813  distance += (ll = owl_editwin_move_to_end_of_line(e));
814  if (ll > goal_column)
815    distance += owl_editwin_point_move(e, goal_column - ll);
816
817  e->goal_column = goal_column;
818
819  return distance;
[7d4fbcd]820}
821
[c9334b1]822void owl_editwin_backspace(owl_editwin *e)
823{
[7d4fbcd]824  /* delete the char before the current one
825   * and shift later chars left
826   */
[a556caa]827  if(owl_editwin_point_move(e, -1))
[7d4fbcd]828    owl_editwin_delete_char(e);
829}
830
[c9334b1]831void owl_editwin_key_up(owl_editwin *e)
832{
[a556caa]833  owl_editwin_line_move(e, -1);
[7d4fbcd]834}
835
[c9334b1]836void owl_editwin_key_down(owl_editwin *e)
837{
[a556caa]838  owl_editwin_line_move(e, 1);
[7d4fbcd]839}
840
[c9334b1]841void owl_editwin_key_left(owl_editwin *e)
842{
[a556caa]843  owl_editwin_point_move(e, -1);
[7d4fbcd]844}
845
[c9334b1]846void owl_editwin_key_right(owl_editwin *e)
847{
[a556caa]848  owl_editwin_point_move(e, 1);
[7d4fbcd]849}
850
[5b5f3e6]851int owl_editwin_forward_word(owl_editwin *e)
[c9334b1]852{
[5b5f3e6]853  int distance;
[7d4fbcd]854  /* if we're starting on a space, find the first non-space */
[5b5f3e6]855  distance = owl_editwin_move_if_in(e, 1, WHITESPACE);
[7d4fbcd]856
[a556caa]857  /* now find the end of this word */
[5b5f3e6]858  distance += owl_editwin_move_if_not_in(e, 1, WHITESPACE);
859
860  return distance;
861}
862
863void owl_editwin_move_to_nextword(owl_editwin *e)
864{
865  owl_editwin_forward_word(e);
[7d4fbcd]866}
867
[c9334b1]868/* go backwards to the last non-space character
869 */
[5b5f3e6]870int owl_editwin_backward_word(owl_editwin *e)
[c9334b1]871{
[a0fbdee]872  oe_excursion x;
[5b5f3e6]873  int distance = 0;
874  int further = 0;
[a556caa]875  int beginning;
876  /* if in middle of word, beginning of word */
877
878  /* if at beginning of a word, find beginning of previous word */
879
[e20d8179]880  if (owl_editwin_is_char_in(e, WHITESPACE)) {
[a556caa]881    /* if in whitespace past end of word, find a word , the find the beginning*/
[5b5f3e6]882    distance += owl_editwin_move_if_in(e, -1, WHITESPACE); /* leaves us on the last
883                                                              character of the word */
[a0fbdee]884    oe_save_excursion(e, &x);
[a556caa]885    /* are we at the beginning of a word? */
886    owl_editwin_point_move(e, -1);
[e20d8179]887    beginning = owl_editwin_is_char_in(e, WHITESPACE);
[a0fbdee]888    oe_restore_excursion(e, &x);
[a556caa]889    if (beginning)
[5b5f3e6]890      return distance;
[a556caa]891   } else {
892    /* in the middle of the word; */
[a0fbdee]893    oe_save_excursion(e, &x);
[5b5f3e6]894    further += owl_editwin_point_move(e, -1);
[e20d8179]895    if (owl_editwin_is_char_in(e, WHITESPACE)) { /* we were at the beginning */
[5b5f3e6]896      distance += owl_editwin_backward_word(e); /* previous case */
[8321cb7]897      oe_release_excursion(e, &x);
[5b5f3e6]898      return distance + further;
[a556caa]899    } else {
[a0fbdee]900      oe_restore_excursion(e, &x);
[7d4fbcd]901    }
902  }
[5b5f3e6]903  distance += owl_editwin_move_if_not_in(e, -1, WHITESPACE);
[a556caa]904  /* will go past */
905  if (e->index > e->lock)
[5b5f3e6]906    distance += owl_editwin_point_move(e, 1);
907  return distance;
908}
909
910void owl_editwin_move_to_previousword(owl_editwin *e)
911{
912  owl_editwin_backward_word(e);
[7d4fbcd]913}
914
[c9334b1]915void owl_editwin_delete_nextword(owl_editwin *e)
916{
[a0fbdee]917  oe_excursion x;
[a556caa]918
[a0fbdee]919  oe_save_excursion(e, &x);
[a60edf2]920  oe_set_mark(e, e->index);
921  owl_editwin_forward_word(e);
922  owl_editwin_kill_region(e);
923  oe_restore_mark_only(e, &x);
[7d4fbcd]924}
925
[c9334b1]926void owl_editwin_delete_previousword(owl_editwin *e)
927{
[a60edf2]928  oe_excursion x;
[b68f9cd]929
[a60edf2]930  oe_save_excursion(e, &x);
931  oe_set_mark(e, e->index);
932  owl_editwin_backward_word(e);
933  owl_editwin_kill_region(e);
934  oe_restore_mark_only(e, &x);
[b68f9cd]935}
936
[a556caa]937void owl_editwin_move_to_line_end(owl_editwin *e)
[c9334b1]938{
[a556caa]939  owl_editwin_move_to_end_of_line(e);
[7d4fbcd]940}
941
[a556caa]942void owl_editwin_delete_to_endofline(owl_editwin *e)
[c9334b1]943{
[a0fbdee]944  oe_excursion x;
[5b5f3e6]945  int distance;
[a556caa]946
[a0fbdee]947  oe_save_excursion(e, &x);
[a60edf2]948  owl_editwin_set_mark(e);
[5b5f3e6]949  distance = owl_editwin_move_to_end_of_line(e);
[a60edf2]950  if (distance)
951    owl_editwin_kill_region(e);
952  else
953    owl_editwin_replace(e, 1, "");
[a0fbdee]954  oe_restore_excursion(e, &x);
[a60edf2]955}
956
957void owl_editwin_yank(owl_editwin *e)
958{
959  if (e->killbuf != NULL)
960    owl_editwin_replace(e, 0, e->killbuf);
961}
962
963static char *oe_copy_buf(owl_editwin *e, char *buf, int len)
964{
965  char *p;
966
967  p = owl_malloc(len + 1);
968
969  if (p != NULL) {
970    owl_free(e->killbuf);
971    e->killbuf = p;
972    memcpy(e->killbuf, buf, len);
973    e->killbuf[len] = 0;
974  }
975
976  return p;
977}
978
979static int oe_copy_region(owl_editwin *e)
980{
981  char *p;
982  int start, end;
983
984  if (e->mark == -1)
985    return 0;
986
987  start = MIN(e->index, e->mark);
988  end = MAX(e->index, e->mark);
989
990  p = oe_copy_buf(e, e->buff + start, end - start);
991  if (p != NULL)
992    return end - start;
993  return 0;
994}
995
996void owl_editwin_copy_region_as_kill(owl_editwin *e)
997{
998  oe_copy_region(e);
999}
1000
1001void owl_editwin_kill_region(owl_editwin *e)
1002{
1003  if (e->index > e->mark)
1004    owl_editwin_exchange_point_and_mark(e);
1005
1006  owl_editwin_replace(e, oe_copy_region(e), "");
[7d4fbcd]1007}
1008
[c9334b1]1009void owl_editwin_move_to_line_start(owl_editwin *e)
1010{
[a556caa]1011  owl_editwin_move_to_beginning_of_line(e);
[7d4fbcd]1012}
1013
[c9334b1]1014void owl_editwin_move_to_end(owl_editwin *e)
1015{
[521bc84]1016  oe_set_index(e, e->bufflen);
[7d4fbcd]1017}
1018
[c9334b1]1019void owl_editwin_move_to_top(owl_editwin *e)
1020{
[521bc84]1021  oe_set_index(e, e->lock);
[7d4fbcd]1022}
1023
[fc2677b]1024static int oe_display_column(owl_editwin *e)
[c9334b1]1025{
[a0fbdee]1026  oe_excursion x;
[fc2677b]1027  int lineindex;
[7d4fbcd]1028
[a0fbdee]1029  oe_save_excursion(e, &x);
[fc2677b]1030  owl_editwin_move_to_beginning_of_line(e);
1031  lineindex = e->index;
1032  oe_restore_excursion(e, &x);
1033  return oe_region_width(e, lineindex, e->index, 0);
1034}
[a556caa]1035
[fc2677b]1036void owl_editwin_fill_paragraph(owl_editwin *e)
1037{
1038  oe_excursion x;
1039  gunichar ch;
1040  int sentence;
[7d4fbcd]1041
[fc2677b]1042  oe_save_excursion(e, &x);
[7d4fbcd]1043
[fc2677b]1044  /* Mark the end of the paragraph */
1045  owl_editwin_forward_paragraph(e);
1046  /* Skip the trailing newline */
1047  owl_editwin_point_move(e, -1);
1048  owl_editwin_set_mark(e);
[7d4fbcd]1049
[fc2677b]1050  owl_editwin_backward_paragraph(e);
[7d4fbcd]1051
[fc2677b]1052  /* Don't mess with the leading newline */
1053  if (owl_editwin_get_char_at_point(e) == '\n')
1054    owl_editwin_point_move(e, 1);
[7d4fbcd]1055
[fc2677b]1056  /*
1057   * First pass: Scan forward replacing all series of spaces with ' '
1058   * (or nothing after CJK ideograms)
1059   */
1060  sentence = 0;
1061  for(;e->index < e->mark; owl_editwin_point_move(e, 1)) {
[50e671c]1062    /* bail if we hit a trailing dot on the buffer */
[fc2677b]1063    if (strcmp(e->buff + e->index, "\n.") == 0) {
1064      owl_editwin_set_mark(e);
[50e671c]1065      break;
[7d4fbcd]1066    }
1067
[fc2677b]1068    ch = owl_editwin_get_char_at_point(e);
[b2c1bd4]1069
[fc2677b]1070    if (owl_util_can_break_after(ch) || ch == '\n') {
1071      if (g_unichar_isspace(ch)) {
1072        owl_editwin_replace(e, 1, " ");
1073      }
1074
1075      if (sentence)
1076        owl_editwin_point_move(e, 1);
1077
1078      while(g_unichar_isspace(owl_editwin_get_char_at_point(e))
1079            && e->index < e->mark) {
1080        owl_editwin_delete_char(e);
[7d4fbcd]1081      }
1082    }
[fc2677b]1083
1084    if(ch == '.' || ch == '!' || ch == '?')
1085      sentence = 1;
1086    else
1087      sentence = 0;
1088  }
1089
1090  owl_editwin_backward_paragraph(e);
1091
1092  /* Now go through inserting newlines as needed */
1093  while(e->index < e->mark) {
1094    /* if we've travelled too far, linewrap */
1095    if (oe_display_column(e) >= e->fillcol)
1096      _owl_editwin_linewrap_word(e);
1097    owl_editwin_point_move(e, 1);
[7d4fbcd]1098  }
1099
[a0fbdee]1100  oe_restore_excursion(e, &x);
[7d4fbcd]1101}
1102
[cf83b7a]1103/* returns true if only whitespace remains */
[c9334b1]1104int owl_editwin_is_at_end(owl_editwin *e)
1105{
[a556caa]1106  return (only_whitespace(e->buff + e->index));
[217a43e]1107}
1108
[bab52da]1109static int owl_editwin_check_dotsend(owl_editwin *e)
[c9334b1]1110{
[47519e1b]1111  char *p, *p_n, *p_p;
1112  gunichar c;
[7d4fbcd]1113
1114  if (!e->dotsend) return(0);
[47519e1b]1115
1116  p = g_utf8_find_prev_char(e->buff, e->buff + e->bufflen);
1117  p_n = g_utf8_find_next_char(p, NULL);
1118  p_p = g_utf8_find_prev_char(e->buff, p);
1119  c = g_utf8_get_char(p);
1120  while (p != NULL) {
1121    if (*p == '.'
1122        && p_p != NULL && (*p_p == '\n' || *p_p == '\r')
1123        && p_n != NULL && (*p_n == '\n' || *p_n == '\r')) {
1124      e->bufflen = p - e->buff;
1125      e->buff[e->bufflen] = '\0';
[7d4fbcd]1126      return(1);
1127    }
[47519e1b]1128    if (c != '\0' && !g_unichar_isspace(c)) return(0);
1129    p_n = p;
1130    p = p_p;
1131    c = g_utf8_get_char(p);
1132    p_p = g_utf8_find_prev_char(e->buff, p);
[7d4fbcd]1133  }
1134  return(0);
1135}
1136
[fac5463]1137void owl_editwin_post_process_char(owl_editwin *e, owl_input j)
[c9334b1]1138{
[a556caa]1139  /* XXX force a redisplay? */
[fac5463]1140  if ((j.ch==13 || j.ch==10) && owl_editwin_check_dotsend(e)) {
[7d4fbcd]1141    owl_command_editmulti_done(e);
1142    return;
1143  }
[e20d8179]1144  owl_editwin_redisplay(e, 0);
[7d4fbcd]1145}
1146
[16cfd12a]1147static int oe_region_width(owl_editwin *e, int start, int end, int width)
1148{
1149  char *p;
1150  for(p = e->buff + start;
1151      p < e->buff + end;
1152      p = g_utf8_find_next_char(p, NULL))
1153    width += oe_char_width(g_utf8_get_char(p), width);
1154
1155  return width;
1156}
1157
[ebf0128]1158static void oe_insert_char(owl_editwin *e, gunichar c)
[fac5463]1159{
[16cfd12a]1160  oe_excursion x;
[5b5f3e6]1161  char tmp[7];
[16cfd12a]1162  int replaced = -1;
[5b5f3e6]1163
[ebf0128]1164  if (c == '\r') /* translate CRs to NLs */
1165    c = '\n';
1166
[16cfd12a]1167  if (!g_unichar_iscntrl(c) || c == '\n' || c== '\t' ) {
[ebf0128]1168    memset(tmp, 0, 7);
1169
1170    if (c == '\n' && e->style == OWL_EDITWIN_STYLE_ONELINE) {
1171      return;
1172    }
1173
[16cfd12a]1174    if (e->cursorx != -1 && e->cursorx + oe_char_width(c, e->cursorx) > e->wrapcol) {
1175      /* XXX this is actually wrong:
1176       * + If the line has been been wrapped, we can be past the wrap column but
1177       *   e->cursorx be much smaller.
1178       * + If the user went back and inserted a bunch of stuff in the middle of
1179       *   the line, there may be more than one word past the wrap column.
1180       */
1181      oe_save_excursion(e, &x);
1182
1183      if (c == ' ' || c == '\t') {
1184        owl_editwin_point_move(e, -1);
1185        replaced = -owl_editwin_move_if_in(e, -1, " \t");
1186        if (!replaced) {
1187          c = '\n';
1188          replaced = -1;
1189        }
1190      } else {
1191        while(!owl_editwin_at_beginning_of_line(e)) {
1192          owl_editwin_point_move(e, -1);
1193          if (owl_util_can_break_after(owl_editwin_get_char_at_point(e))) {
1194            replaced = -owl_editwin_move_if_in(e, -1, " \t");
1195            break;
1196          }
1197        }
1198        if (owl_editwin_at_beginning_of_line(e))
1199          replaced = -1;
1200      }
1201      if (replaced && !owl_editwin_at_beginning_of_line(e))
1202        owl_editwin_point_move(e, 1);
1203      if (replaced >= 0) {
1204        owl_editwin_replace(e, replaced, "\n");
1205      }
1206      oe_restore_excursion(e, &x);
1207    }
1208
1209    if (replaced >= 0 && (c == ' ' || c == '\t'))
1210      return; /* our work here is done */
1211
[ebf0128]1212    g_unichar_to_utf8(c, tmp);
1213    owl_editwin_replace(e, 0, tmp);
1214  }
1215}
1216
1217void owl_editwin_process_char(owl_editwin *e, owl_input j)
1218{
[5b5f3e6]1219  if (j.ch == ERR)
1220    return;
[fac5463]1221  /* Ignore ncurses control characters. */
[e20d8179]1222  if (j.ch < 0x100) {
[ebf0128]1223    oe_insert_char(e, j.uch);
[fac5463]1224  }
1225}
1226
[c9334b1]1227char *owl_editwin_get_text(owl_editwin *e)
1228{
[7d4fbcd]1229  return(e->buff+e->lock);
1230}
1231
[a556caa]1232int owl_editwin_get_echochar(owl_editwin *e) {
1233  return e->echochar;
1234}
[2f21a41]1235
1236/*
1237 * Local Variables:
1238 * mode:C
1239 * c-basic-offset:2
1240 * End:
1241 */
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