source: fmtext.c @ 4f746f8

release-1.8release-1.9
Last change on this file since 4f746f8 was 7b4f3be, checked in by David Benjamin <davidben@mit.edu>, 10 years ago
Punt owl_global_hascolors There's not much point as we're hardly abstracting ncurses away. Either call has_colors directly or just don't bother and let another layer take care of it.
  • Property mode set to 100644
File size: 25.8 KB
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1#include "owl.h"
2#include <stdlib.h>
3#include <string.h>
4
5/* initialize an fmtext with no data */
6void owl_fmtext_init_null(owl_fmtext *f)
7{
8  f->buff = g_string_new("");
9}
10
11/* Clear the data from an fmtext, but don't deallocate memory. This
12   fmtext can then be appended to again. */
13void owl_fmtext_clear(owl_fmtext *f)
14{
15  g_string_truncate(f->buff, 0);
16}
17
18int owl_fmtext_is_format_char(gunichar c)
19{
20  if ((c & ~OWL_FMTEXT_UC_ATTR_MASK) == OWL_FMTEXT_UC_ATTR) return 1;
21  if ((c & ~(OWL_FMTEXT_UC_ALLCOLOR_MASK)) == OWL_FMTEXT_UC_COLOR_BASE) return 1;
22  return 0;
23}
24/* append text to the end of 'f' with attribute 'attr' and color
25 * 'color'
26 */
27void owl_fmtext_append_attr(owl_fmtext *f, const char *text, char attr, short fgcolor, short bgcolor)
28{
29  int a = 0, fg = 0, bg = 0;
30 
31  if (attr != OWL_FMTEXT_ATTR_NONE) a=1;
32  if (fgcolor != OWL_COLOR_DEFAULT) fg=1;
33  if (bgcolor != OWL_COLOR_DEFAULT) bg=1;
34
35  /* Set attributes */
36  if (a)
37    g_string_append_unichar(f->buff, OWL_FMTEXT_UC_ATTR | attr);
38  if (fg)
39    g_string_append_unichar(f->buff, OWL_FMTEXT_UC_FGCOLOR | fgcolor);
40  if (bg)
41    g_string_append_unichar(f->buff, OWL_FMTEXT_UC_BGCOLOR | bgcolor);
42
43  g_string_append(f->buff, text);
44
45  /* Reset attributes */
46  if (bg) g_string_append_unichar(f->buff, OWL_FMTEXT_UC_BGDEFAULT);
47  if (fg) g_string_append_unichar(f->buff, OWL_FMTEXT_UC_FGDEFAULT);
48  if (a)  g_string_append_unichar(f->buff, OWL_FMTEXT_UC_ATTR | OWL_FMTEXT_UC_ATTR);
49}
50
51/* Append normal, uncolored text 'text' to 'f' */
52void owl_fmtext_append_normal(owl_fmtext *f, const char *text)
53{
54  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_NONE, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
55}
56
57/* Append normal, uncolored text specified by format string to 'f' */
58void G_GNUC_PRINTF(2, 3) owl_fmtext_appendf_normal(owl_fmtext *f, const char *fmt, ...)
59{
60  va_list ap;
61  char *buff;
62
63  va_start(ap, fmt);
64  buff = g_strdup_vprintf(fmt, ap);
65  va_end(ap);
66  if (!buff)
67    return;
68  owl_fmtext_append_attr(f, buff, OWL_FMTEXT_ATTR_NONE, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
69  g_free(buff);
70}
71
72/* Append normal text 'text' to 'f' with color 'color' */
73void owl_fmtext_append_normal_color(owl_fmtext *f, const char *text, int fgcolor, int bgcolor)
74{
75  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_NONE, fgcolor, bgcolor);
76}
77
78/* Append bold text 'text' to 'f' */
79void owl_fmtext_append_bold(owl_fmtext *f, const char *text)
80{
81  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_BOLD, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
82}
83
84/* Append reverse video text 'text' to 'f' */
85void owl_fmtext_append_reverse(owl_fmtext *f, const char *text)
86{
87  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_REVERSE, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
88}
89
90/* Append reversed and bold, uncolored text 'text' to 'f' */
91void owl_fmtext_append_reversebold(owl_fmtext *f, const char *text)
92{
93  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_REVERSE | OWL_FMTEXT_ATTR_BOLD, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
94}
95
96/* Internal function. Parse attrbute character. */
97static void _owl_fmtext_update_attributes(gunichar c, char *attr, short *fgcolor, short *bgcolor)
98{
99  if ((c & OWL_FMTEXT_UC_ATTR) == OWL_FMTEXT_UC_ATTR) {
100    *attr = c & OWL_FMTEXT_UC_ATTR_MASK;
101  }
102  else if ((c & OWL_FMTEXT_UC_COLOR_BASE) == OWL_FMTEXT_UC_COLOR_BASE) {
103    if ((c & OWL_FMTEXT_UC_BGCOLOR) == OWL_FMTEXT_UC_BGCOLOR) {
104      *bgcolor = (c == OWL_FMTEXT_UC_BGDEFAULT
105                  ? OWL_COLOR_DEFAULT
106                  : c & OWL_FMTEXT_UC_COLOR_MASK);
107    }
108    else if ((c & OWL_FMTEXT_UC_FGCOLOR) == OWL_FMTEXT_UC_FGCOLOR) {
109      *fgcolor = (c == OWL_FMTEXT_UC_FGDEFAULT
110                  ? OWL_COLOR_DEFAULT
111                  : c & OWL_FMTEXT_UC_COLOR_MASK);
112    }
113  }
114}
115
116/* Internal function. Scan for attribute characters. */
117static void _owl_fmtext_scan_attributes(const owl_fmtext *f, int start, char *attr, short *fgcolor, short *bgcolor)
118{
119  const char *p;
120  p = strchr(f->buff->str, OWL_FMTEXT_UC_STARTBYTE_UTF8);
121  while (p && p < f->buff->str + start) {
122    _owl_fmtext_update_attributes(g_utf8_get_char(p), attr, fgcolor, bgcolor);
123    p = strchr(p+1, OWL_FMTEXT_UC_STARTBYTE_UTF8);
124  }
125} 
126
127/* Internal function.  Append text from 'in' between index 'start'
128 * inclusive and 'stop' exclusive, to the end of 'f'. This function
129 * works with bytes.
130 */
131static void _owl_fmtext_append_fmtext(owl_fmtext *f, const owl_fmtext *in, int start, int stop)
132{
133  char attr = 0;
134  short fgcolor = OWL_COLOR_DEFAULT;
135  short bgcolor = OWL_COLOR_DEFAULT;
136
137  _owl_fmtext_scan_attributes(in, start, &attr, &fgcolor, &bgcolor);
138
139  if (attr != OWL_FMTEXT_ATTR_NONE)
140    g_string_append_unichar(f->buff, OWL_FMTEXT_UC_ATTR | attr);
141  if (fgcolor != OWL_COLOR_DEFAULT)
142    g_string_append_unichar(f->buff, OWL_FMTEXT_UC_FGCOLOR | fgcolor);
143  if (bgcolor != OWL_COLOR_DEFAULT)
144    g_string_append_unichar(f->buff, OWL_FMTEXT_UC_BGCOLOR | bgcolor);
145
146  g_string_append_len(f->buff, in->buff->str+start, stop-start);
147
148  /* Reset attributes */
149  g_string_append_unichar(f->buff, OWL_FMTEXT_UC_BGDEFAULT);
150  g_string_append_unichar(f->buff, OWL_FMTEXT_UC_FGDEFAULT);
151  g_string_append_unichar(f->buff, OWL_FMTEXT_UC_ATTR | OWL_FMTEXT_UC_ATTR);
152}
153
154/* append fmtext 'in' to 'f' */
155void owl_fmtext_append_fmtext(owl_fmtext *f, const owl_fmtext *in)
156{
157  _owl_fmtext_append_fmtext(f, in, 0, in->buff->len);
158
159}
160
161/* Append 'nspaces' number of spaces to the end of 'f' */
162void owl_fmtext_append_spaces(owl_fmtext *f, int nspaces)
163{
164  int i;
165  for (i=0; i<nspaces; i++) {
166    owl_fmtext_append_normal(f, " ");
167  }
168}
169
170/* Return a plain version of the fmtext.  Caller is responsible for
171 * freeing the return
172 */
173char *owl_fmtext_print_plain(const owl_fmtext *f)
174{
175  return owl_strip_format_chars(f->buff->str);
176}
177
178static void _owl_fmtext_wattrset(WINDOW *w, int attrs)
179{
180  wattrset(w, A_NORMAL);
181  if (attrs & OWL_FMTEXT_ATTR_BOLD) wattron(w, A_BOLD);
182  if (attrs & OWL_FMTEXT_ATTR_REVERSE) wattron(w, A_REVERSE);
183  if (attrs & OWL_FMTEXT_ATTR_UNDERLINE) wattron(w, A_UNDERLINE);
184}
185
186static void _owl_fmtext_wcolor_set(WINDOW *w, short pair)
187{
188  if (has_colors()) {
189      wcolor_set(w,pair,NULL);
190      wbkgdset(w, COLOR_PAIR(pair));
191  }
192}
193
194/* add the formatted text to the curses window 'w'.  The window 'w'
195 * must already be initiatlized with curses
196 */
197static void _owl_fmtext_curs_waddstr(const owl_fmtext *f, WINDOW *w, int do_search, char default_attrs, short default_fgcolor, short default_bgcolor)
198{
199  /* char *tmpbuff; */
200  /* int position, trans1, trans2, trans3, len, lastsame; */
201  char *s, *p;
202  char attr;
203  short fg, bg, pair = 0;
204 
205  if (w==NULL) {
206    owl_function_debugmsg("Hit a null window in owl_fmtext_curs_waddstr.");
207    return;
208  }
209
210  s = f->buff->str;
211  /* Set default attributes. */
212  attr = default_attrs;
213  fg = default_fgcolor;
214  bg = default_bgcolor;
215  _owl_fmtext_wattrset(w, attr);
216  pair = owl_fmtext_get_colorpair(fg, bg);
217  _owl_fmtext_wcolor_set(w, pair);
218
219  /* Find next possible format character. */
220  p = strchr(s, OWL_FMTEXT_UC_STARTBYTE_UTF8);
221  while(p) {
222    if (owl_fmtext_is_format_char(g_utf8_get_char(p))) {
223      /* Deal with all text from last insert to here. */
224      char tmp;
225   
226      tmp = p[0];
227      p[0] = '\0';
228      if (do_search && owl_global_is_search_active(&g)) {
229        /* Search is active, so highlight search results. */
230        int start, end;
231        while (owl_regex_compare(owl_global_get_search_re(&g), s, &start, &end) == 0) {
232          /* Prevent an infinite loop matching the empty string. */
233          if (end == 0)
234            break;
235
236          /* Found search string, highlight it. */
237
238          waddnstr(w, s, start);
239
240          _owl_fmtext_wattrset(w, attr ^ OWL_FMTEXT_ATTR_REVERSE);
241          _owl_fmtext_wcolor_set(w, pair);
242         
243          waddnstr(w, s + start, end - start);
244
245          _owl_fmtext_wattrset(w, attr);
246          _owl_fmtext_wcolor_set(w, pair);
247
248          s += end;
249        }
250      }
251      /* Deal with remaining part of string. */
252      waddstr(w, s);
253      p[0] = tmp;
254
255      /* Deal with new attributes. Process all consecutive formatting
256       * characters, and then apply defaults where relevant. */
257      while (owl_fmtext_is_format_char(g_utf8_get_char(p))) {
258        _owl_fmtext_update_attributes(g_utf8_get_char(p), &attr, &fg, &bg);
259        p = g_utf8_next_char(p);
260      }
261      attr |= default_attrs;
262      if (fg == OWL_COLOR_DEFAULT) fg = default_fgcolor;
263      if (bg == OWL_COLOR_DEFAULT) bg = default_bgcolor;
264      _owl_fmtext_wattrset(w, attr);
265      pair = owl_fmtext_get_colorpair(fg, bg);
266      _owl_fmtext_wcolor_set(w, pair);
267
268      /* Advance to next non-formatting character. */
269      s = p;
270      p = strchr(s, OWL_FMTEXT_UC_STARTBYTE_UTF8);
271    }
272    else {
273      p = strchr(p+1, OWL_FMTEXT_UC_STARTBYTE_UTF8);
274    }
275  }
276  if (s) {
277    waddstr(w, s);
278  }
279  wbkgdset(w, 0);
280}
281
282void owl_fmtext_curs_waddstr(const owl_fmtext *f, WINDOW *w, char default_attrs, short default_fgcolor, short default_bgcolor)
283{
284  _owl_fmtext_curs_waddstr(f, w, 1, default_attrs, default_fgcolor, default_bgcolor);
285}
286
287void owl_fmtext_curs_waddstr_without_search(const owl_fmtext *f, WINDOW *w, char default_attrs, short default_fgcolor, short default_bgcolor)
288{
289  _owl_fmtext_curs_waddstr(f, w, 0, default_attrs, default_fgcolor, default_bgcolor);
290}
291
292/* Expands tabs. Tabs are expanded as if given an initial indent of start. */
293void owl_fmtext_expand_tabs(const owl_fmtext *in, owl_fmtext *out, int start) {
294  int col = start, numcopied = 0;
295  char *ptr;
296
297  for (ptr = in->buff->str;
298       ptr < in->buff->str + in->buff->len;
299       ptr = g_utf8_next_char(ptr)) {
300    gunichar c = g_utf8_get_char(ptr);
301    int chwidth;
302    if (c == '\t') {
303      /* Copy up to this tab */
304      _owl_fmtext_append_fmtext(out, in, numcopied, ptr - in->buff->str);
305      /* and then copy spaces for the tab. */
306      chwidth = OWL_TAB_WIDTH - (col % OWL_TAB_WIDTH);
307      owl_fmtext_append_spaces(out, chwidth);
308      col += chwidth;
309      numcopied = g_utf8_next_char(ptr) - in->buff->str;
310    } else {
311      /* Just update col. We'll append later. */
312      if (c == '\n') {
313        col = start;
314      } else if (!owl_fmtext_is_format_char(c)) {
315        col += mk_wcwidth(c);
316      }
317    }
318  }
319  /* Append anything we've missed. */
320  if (numcopied < in->buff->len)
321    _owl_fmtext_append_fmtext(out, in, numcopied, in->buff->len);
322}
323
324/* start with line 'aline' (where the first line is 0) and print
325 * 'lines' number of lines into 'out'
326 */
327int owl_fmtext_truncate_lines(const owl_fmtext *in, int aline, int lines, owl_fmtext *out)
328{
329  const char *ptr1, *ptr2;
330  int i, offset;
331 
332  /* find the starting line */
333  ptr1 = in->buff->str;
334  for (i = 0; i < aline; i++) {
335    ptr1 = strchr(ptr1, '\n');
336    if (!ptr1) return(-1);
337    ptr1++;
338  }
339 
340  /* ptr1 now holds the starting point */
341
342  /* copy in the next 'lines' lines */
343  if (lines < 1) return(-1);
344
345  for (i = 0; i < lines; i++) {
346    offset = ptr1 - in->buff->str;
347    ptr2 = strchr(ptr1, '\n');
348    if (!ptr2) {
349      /* Copy to the end of the buffer. */
350      _owl_fmtext_append_fmtext(out, in, offset, in->buff->len);
351      return(-1);
352    }
353    /* Copy up to, and including, the new line. */
354    _owl_fmtext_append_fmtext(out, in, offset, (ptr2 - ptr1) + offset + 1);
355    ptr1 = ptr2 + 1;
356  }
357  return(0);
358}
359
360/* Implementation of owl_fmtext_truncate_cols. Does not support tabs in input. */
361void _owl_fmtext_truncate_cols_internal(const owl_fmtext *in, int acol, int bcol, owl_fmtext *out)
362{
363  const char *ptr_s, *ptr_e, *ptr_c, *last;
364  int col, st, padding, chwidth;
365
366  last = in->buff->str + in->buff->len - 1;
367  ptr_s = in->buff->str;
368  while (ptr_s <= last) {
369    ptr_e=strchr(ptr_s, '\n');
370    if (!ptr_e) {
371      /* but this shouldn't happen if we end in a \n */
372      break;
373    }
374   
375    if (ptr_e == ptr_s) {
376      owl_fmtext_append_normal(out, "\n");
377      ++ptr_s;
378      continue;
379    }
380
381    col = 0;
382    st = 0;
383    padding = 0;
384    chwidth = 0;
385    ptr_c = ptr_s;
386    while(ptr_c < ptr_e) {
387      gunichar c = g_utf8_get_char(ptr_c);
388      if (!owl_fmtext_is_format_char(c)) {
389        chwidth = mk_wcwidth(c);
390        if (col + chwidth > bcol) break;
391       
392        if (col >= acol) {
393          if (st == 0) {
394            ptr_s = ptr_c;
395            padding = col - acol;
396            ++st;
397          }
398        }
399        col += chwidth;
400        chwidth = 0;
401      }
402      ptr_c = g_utf8_next_char(ptr_c);
403    }
404    if (st) {
405      /* lead padding */
406      owl_fmtext_append_spaces(out, padding);
407      if (ptr_c == ptr_e) {
408        /* We made it to the newline. Append up to, and including it. */
409        _owl_fmtext_append_fmtext(out, in, ptr_s - in->buff->str, ptr_c - in->buff->str + 1);
410      }
411      else if (chwidth > 1) {
412        /* Last char is wide, truncate. */
413        _owl_fmtext_append_fmtext(out, in, ptr_s - in->buff->str, ptr_c - in->buff->str);
414        owl_fmtext_append_normal(out, "\n");
415      }
416      else {
417        /* Last char fits perfectly, We stop at the next char to make
418         * sure we get it all. */
419        ptr_c = g_utf8_next_char(ptr_c);
420        _owl_fmtext_append_fmtext(out, in, ptr_s - in->buff->str, ptr_c - in->buff->str);
421      }
422    }
423    else {
424      owl_fmtext_append_normal(out, "\n");
425    }
426    ptr_s = g_utf8_next_char(ptr_e);
427  }
428}
429
430/* Truncate the message so that each line begins at column 'acol' and
431 * ends at 'bcol' or sooner.  The first column is number 0.  The new
432 * message is placed in 'out'.  The message is expected to end in a
433 * new line for now.
434 *
435 * NOTE: This needs to be modified to deal with backing up if we find
436 * a SPACING COMBINING MARK at the end of a line. If that happens, we
437 * should back up to the last non-mark character and stop there.
438 *
439 * NOTE: If a line ends at bcol, we omit the newline. This is so printing
440 * to ncurses works.
441 */
442void owl_fmtext_truncate_cols(const owl_fmtext *in, int acol, int bcol, owl_fmtext *out)
443{
444  owl_fmtext notabs;
445
446  /* _owl_fmtext_truncate_cols_internal cannot handle tabs. */
447  if (strchr(in->buff->str, '\t')) {
448    owl_fmtext_init_null(&notabs);
449    owl_fmtext_expand_tabs(in, &notabs, 0);
450    _owl_fmtext_truncate_cols_internal(&notabs, acol, bcol, out);
451    owl_fmtext_cleanup(&notabs);
452  } else {
453    _owl_fmtext_truncate_cols_internal(in, acol, bcol, out);
454  }
455}
456
457/* Return the number of lines in 'f' */
458int owl_fmtext_num_lines(const owl_fmtext *f)
459{
460  int lines, i;
461  char *lastbreak, *p;
462
463  lines=0;
464  lastbreak = f->buff->str;
465  for (i = 0; i < f->buff->len; i++) {
466    if (f->buff->str[i]=='\n') {
467      lastbreak = f->buff->str + i;
468      lines++;
469    }
470  }
471
472  /* Check if there's a trailing line; formatting characters don't count. */
473  for (p = g_utf8_next_char(lastbreak);
474       p < f->buff->str + f->buff->len;
475       p = g_utf8_next_char(p)) {
476    if (!owl_fmtext_is_format_char(g_utf8_get_char(p))) {
477      lines++;
478      break;
479    }
480  }
481
482  return(lines);
483}
484
485/* Returns the line number, starting at 0, of the character which
486 * contains the byte at 'offset'. Note that a trailing newline is part
487 * of the line it ends. Also, while a trailing line of formatting
488 * characters does not contribute to owl_fmtext_num_lines, those
489 * characters are considered on a new line. */
490int owl_fmtext_line_number(const owl_fmtext *f, int offset)
491{
492  int i, lineno = 0;
493  if (offset >= f->buff->len)
494    offset = f->buff->len - 1;
495  for (i = 0; i < offset; i++) {
496    if (f->buff->str[i] == '\n')
497      lineno++;
498  }
499  return lineno;
500}
501
502/* Searches for line 'lineno' in 'f'. The returned range, [start,
503 * end), forms a half-open interval for the extent of the line. */
504void owl_fmtext_line_extents(const owl_fmtext *f, int lineno, int *o_start, int *o_end)
505{
506  int start, end;
507  char *newline;
508  for (start = 0; lineno > 0 && start < f->buff->len; start++) {
509    if (f->buff->str[start] == '\n')
510      lineno--;
511  }
512  newline = strchr(f->buff->str + start, '\n');
513  /* Include the newline, if it is there. */
514  end = newline ? newline - f->buff->str + 1 : f->buff->len;
515  if (o_start) *o_start = start;
516  if (o_end) *o_end = end;
517}
518
519const char *owl_fmtext_get_text(const owl_fmtext *f)
520{
521  return f->buff->str;
522}
523
524int owl_fmtext_num_bytes(const owl_fmtext *f)
525{
526  return f->buff->len;
527}
528
529/* Make a copy of the fmtext 'src' into 'dst' */
530void owl_fmtext_copy(owl_fmtext *dst, const owl_fmtext *src)
531{
532  dst->buff = g_string_new(src->buff->str);
533}
534
535/* Search 'f' for the regex 're' for matches starting at
536 * 'start'. Returns the offset of the first match, -1 if not
537 * found. This is a case-insensitive search.
538 */
539int owl_fmtext_search(const owl_fmtext *f, const owl_regex *re, int start)
540{
541  int offset;
542  if (start > f->buff->len ||
543      owl_regex_compare(re, f->buff->str + start, &offset, NULL) != 0)
544    return -1;
545  return offset + start;
546}
547
548
549/* Append the text 'text' to 'f' and interpret the zephyr style
550 * formatting syntax to set appropriate attributes.
551 */
552void owl_fmtext_append_ztext(owl_fmtext *f, const char *text)
553{
554  int stacksize, curattrs, curcolor;
555  const char *ptr, *txtptr, *tmpptr;
556  char *buff;
557  int attrstack[32], chrstack[32], colorstack[32];
558
559  curattrs=OWL_FMTEXT_ATTR_NONE;
560  curcolor=OWL_COLOR_DEFAULT;
561  stacksize=0;
562  txtptr=text;
563  while (1) {
564    ptr=strpbrk(txtptr, "@{[<()>]}");
565    if (!ptr) {
566      /* add all the rest of the text and exit */
567      owl_fmtext_append_attr(f, txtptr, curattrs, curcolor, OWL_COLOR_DEFAULT);
568      return;
569    } else if (ptr[0]=='@') {
570      /* add the text up to this point then deal with the stack */
571      buff=g_new(char, ptr-txtptr+20);
572      strncpy(buff, txtptr, ptr-txtptr);
573      buff[ptr-txtptr]='\0';
574      owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
575      g_free(buff);
576
577      /* update pointer to point at the @ */
578      txtptr=ptr;
579
580      /* now the stack */
581
582      /* if we've hit our max stack depth, print the @ and move on */
583      if (stacksize==32) {
584        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
585        txtptr++;
586        continue;
587      }
588
589      /* if it's an @@, print an @ and continue */
590      if (txtptr[1]=='@') {
591        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
592        txtptr+=2;
593        continue;
594      }
595       
596      /* if there's no opener, print the @ and continue */
597      tmpptr=strpbrk(txtptr, "(<[{ ");
598      if (!tmpptr || tmpptr[0]==' ') {
599        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
600        txtptr++;
601        continue;
602      }
603
604      /* check what command we've got, push it on the stack, start
605         using it, and continue ... unless it's a color command */
606      buff=g_new(char, tmpptr-ptr+20);
607      strncpy(buff, ptr, tmpptr-ptr);
608      buff[tmpptr-ptr]='\0';
609      if (!strcasecmp(buff, "@bold")) {
610        attrstack[stacksize]=OWL_FMTEXT_ATTR_BOLD;
611        chrstack[stacksize]=tmpptr[0];
612        colorstack[stacksize]=curcolor;
613        stacksize++;
614        curattrs|=OWL_FMTEXT_ATTR_BOLD;
615        txtptr+=6;
616        g_free(buff);
617        continue;
618      } else if (!strcasecmp(buff, "@b")) {
619        attrstack[stacksize]=OWL_FMTEXT_ATTR_BOLD;
620        chrstack[stacksize]=tmpptr[0];
621        colorstack[stacksize]=curcolor;
622        stacksize++;
623        curattrs|=OWL_FMTEXT_ATTR_BOLD;
624        txtptr+=3;
625        g_free(buff);
626        continue;
627      } else if (!strcasecmp(buff, "@i")) {
628        attrstack[stacksize]=OWL_FMTEXT_ATTR_UNDERLINE;
629        chrstack[stacksize]=tmpptr[0];
630        colorstack[stacksize]=curcolor;
631        stacksize++;
632        curattrs|=OWL_FMTEXT_ATTR_UNDERLINE;
633        txtptr+=3;
634        g_free(buff);
635        continue;
636      } else if (!strcasecmp(buff, "@italic")) {
637        attrstack[stacksize]=OWL_FMTEXT_ATTR_UNDERLINE;
638        chrstack[stacksize]=tmpptr[0];
639        colorstack[stacksize]=curcolor;
640        stacksize++;
641        curattrs|=OWL_FMTEXT_ATTR_UNDERLINE;
642        txtptr+=8;
643        g_free(buff);
644        continue;
645      } else if (!strcasecmp(buff, "@")) {
646        attrstack[stacksize]=OWL_FMTEXT_ATTR_NONE;
647        chrstack[stacksize]=tmpptr[0];
648        colorstack[stacksize]=curcolor;
649        stacksize++;
650        txtptr+=2;
651        g_free(buff);
652        continue;
653
654        /* if it's a color read the color, set the current color and
655           continue */
656      } else if (!strcasecmp(buff, "@color") 
657                 && owl_global_is_colorztext(&g)) {
658        g_free(buff);
659        txtptr+=7;
660        tmpptr=strpbrk(txtptr, "@{[<()>]}");
661        if (tmpptr &&
662            ((txtptr[-1]=='(' && tmpptr[0]==')') ||
663             (txtptr[-1]=='<' && tmpptr[0]=='>') ||
664             (txtptr[-1]=='[' && tmpptr[0]==']') ||
665             (txtptr[-1]=='{' && tmpptr[0]=='}'))) {
666
667          /* grab the color name */
668          buff=g_new(char, tmpptr-txtptr+20);
669          strncpy(buff, txtptr, tmpptr-txtptr);
670          buff[tmpptr-txtptr]='\0';
671
672          /* set it as the current color */
673          curcolor=owl_util_string_to_color(buff);
674          if (curcolor == OWL_COLOR_INVALID)
675              curcolor = OWL_COLOR_DEFAULT;
676          g_free(buff);
677          txtptr=tmpptr+1;
678          continue;
679
680        } else {
681
682        }
683
684      } else {
685        /* if we didn't understand it, we'll print it.  This is different from zwgc
686         * but zwgc seems to be smarter about some screw cases than I am
687         */
688        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
689        txtptr++;
690        continue;
691      }
692
693    } else if (ptr[0]=='}' || ptr[0]==']' || ptr[0]==')' || ptr[0]=='>') {
694      /* add the text up to this point first */
695      buff=g_new(char, ptr-txtptr+20);
696      strncpy(buff, txtptr, ptr-txtptr);
697      buff[ptr-txtptr]='\0';
698      owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
699      g_free(buff);
700
701      /* now deal with the closer */
702      txtptr=ptr;
703
704      /* first, if the stack is empty we must bail (just print and go) */
705      if (stacksize==0) {
706        buff=g_new(char, 5);
707        buff[0]=ptr[0];
708        buff[1]='\0';
709        owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
710        g_free(buff);
711        txtptr++;
712        continue;
713      }
714
715      /* if the closing char is what's on the stack, turn off the
716         attribue and pop the stack */
717      if ((ptr[0]==')' && chrstack[stacksize-1]=='(') ||
718          (ptr[0]=='>' && chrstack[stacksize-1]=='<') ||
719          (ptr[0]==']' && chrstack[stacksize-1]=='[') ||
720          (ptr[0]=='}' && chrstack[stacksize-1]=='{')) {
721        int i;
722        stacksize--;
723        curattrs=OWL_FMTEXT_ATTR_NONE;
724        curcolor = colorstack[stacksize];
725        for (i=0; i<stacksize; i++) {
726          curattrs|=attrstack[i];
727        }
728        txtptr+=1;
729        continue;
730      } else {
731        /* otherwise print and continue */
732        buff=g_new(char, 5);
733        buff[0]=ptr[0];
734        buff[1]='\0';
735        owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
736        g_free(buff);
737        txtptr++;
738        continue;
739      }
740    } else {
741      /* we've found an unattached opener, print everything and move on */
742      buff=g_new(char, ptr-txtptr+20);
743      strncpy(buff, txtptr, ptr-txtptr+1);
744      buff[ptr-txtptr+1]='\0';
745      owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
746      g_free(buff);
747      txtptr=ptr+1;
748      continue;
749    }
750  }
751}
752
753/* requires that the list values are strings or NULL.
754 * joins the elements together with join_with.
755 * If format_fn is specified, passes it the list element value
756 * and it will return a string which this needs to free. */
757void owl_fmtext_append_list(owl_fmtext *f, const owl_list *l, const char *join_with, char *(format_fn)(const char *))
758{
759  int i, size;
760  const char *elem;
761  char *text;
762
763  size = owl_list_get_size(l);
764  for (i=0; i<size; i++) {
765    elem = owl_list_get_element(l,i);
766    if (elem && format_fn) {
767      text = format_fn(elem);
768      if (text) {
769        owl_fmtext_append_normal(f, text);
770        g_free(text);
771      }
772    } else if (elem) {
773      owl_fmtext_append_normal(f, elem);
774    }
775    if ((i < size-1) && join_with) {
776      owl_fmtext_append_normal(f, join_with);
777    }
778  }
779}
780
781/* Free all memory allocated by the object */
782void owl_fmtext_cleanup(owl_fmtext *f)
783{
784  if (f->buff) g_string_free(f->buff, true);
785  f->buff = NULL;
786}
787
788/*** Color Pair manager ***/
789void owl_fmtext_init_colorpair_mgr(owl_colorpair_mgr *cpmgr)
790{
791  /* This could be a bitarray if we wanted to save memory. */
792  short i;
793  /* The test is <= because we allocate COLORS+1 entries. */
794  cpmgr->pairs = g_new(short *, COLORS + 1);
795  for(i = 0; i <= COLORS; i++) {
796    cpmgr->pairs[i] = g_new(short, COLORS + 1);
797  }
798  owl_fmtext_reset_colorpairs(cpmgr);
799}
800
801/* Reset used list */
802void owl_fmtext_reset_colorpairs(owl_colorpair_mgr *cpmgr)
803{
804  short i, j;
805
806  cpmgr->overflow = false;
807  cpmgr->next = 8;
808  /* The test is <= because we allocated COLORS+1 entries. */
809  for(i = 0; i <= COLORS; i++) {
810    for(j = 0; j <= COLORS; j++) {
811      cpmgr->pairs[i][j] = -1;
812    }
813  }
814  if (has_colors()) {
815    for(i = 0; i < 8; i++) {
816      short fg, bg;
817      if (i >= COLORS) continue;
818      pair_content(i, &fg, &bg);
819      cpmgr->pairs[fg+1][bg+1] = i;
820    }
821  }
822}
823
824/* Assign pairs by request */
825short owl_fmtext_get_colorpair(int fg, int bg)
826{
827  owl_colorpair_mgr *cpmgr;
828  short pair;
829
830  if (!has_colors())
831    return 0;
832
833  /* Sanity (Bounds) Check */
834  if (fg > COLORS || fg < OWL_COLOR_DEFAULT) fg = OWL_COLOR_DEFAULT;
835  if (bg > COLORS || bg < OWL_COLOR_DEFAULT) bg = OWL_COLOR_DEFAULT;
836           
837#ifdef HAVE_USE_DEFAULT_COLORS
838  if (fg == OWL_COLOR_DEFAULT) fg = -1;
839#else
840  if (fg == OWL_COLOR_DEFAULT) fg = 0;
841  if (bg == OWL_COLOR_DEFAULT) bg = 0;
842#endif
843
844  /* looking for a pair we already set up for this draw. */
845  cpmgr = owl_global_get_colorpair_mgr(&g);
846  pair = cpmgr->pairs[fg+1][bg+1];
847  if (!(pair != -1 && pair < cpmgr->next)) {
848    /* If we didn't find a pair, search for a free one to assign. */
849    pair = (cpmgr->next < owl_util_get_colorpairs()) ? cpmgr->next : -1;
850    if (pair != -1) {
851      /* We found a free pair, initialize it. */
852      init_pair(pair, fg, bg);
853      cpmgr->pairs[fg+1][bg+1] = pair;
854      cpmgr->next++;
855    }
856    else if (bg != OWL_COLOR_DEFAULT) {
857      /* We still don't have a pair, drop the background color. Too bad. */
858      owl_function_debugmsg("colorpairs: color shortage - dropping background color.");
859      cpmgr->overflow = true;
860      pair = owl_fmtext_get_colorpair(fg, OWL_COLOR_DEFAULT);
861    }
862    else {
863      /* We still don't have a pair, defaults all around. */
864      owl_function_debugmsg("colorpairs: color shortage - dropping foreground and background color.");
865      cpmgr->overflow = true;
866      pair = 0;
867    }
868  }
869  return pair;
870}
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