mdw@git.distorted.org.uk Git - sgt/halibut/blob - bk_text.c

   1 /*
   2  * text backend for Halibut
   3  */
   4
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <assert.h>
   8 #include "halibut.h"
   9
  10 typedef enum { LEFT, LEFTPLUS, CENTRE } alignment;
  11 typedef struct {
  12     alignment align;
  13     int just_numbers;
  14     wchar_t *underline;
  15     wchar_t *number_suffix;
  16 } alignstruct;
  17
  18 typedef struct {
  19     int indent, indent_code;
  20     int listindentbefore, listindentafter;
  21     int width;
  22     alignstruct atitle, achapter, *asect;
  23     int nasect;
  24     int include_version_id;
  25     int indent_preambles;
  26     int charset;
  27     word bullet;
  28     wchar_t *lquote, *rquote, *rule;
  29     char *filename;
  30     wchar_t *listsuffix, *startemph, *endemph;
  31 } textconfig;
  32
  33 typedef struct {
  34     FILE *fp;
  35     int charset;
  36     charset_state state;
  37 } textfile;
  38
  39 static void text_heading(textfile *, word *, word *, word *, alignstruct,
  40                          int, int, textconfig *);
  41 static void text_rule(textfile *, int, int, textconfig *);
  42 static void text_para(textfile *, word *, wchar_t *, word *, int, int, int,
  43                       textconfig *);
  44 static void text_codepara(textfile *, word *, int, int);
  45 static void text_versionid(textfile *, word *, textconfig *);
  46
  47 static void text_output(textfile *, const wchar_t *);
  48 static void text_output_many(textfile *, int, wchar_t);
  49
  50 static alignment utoalign(wchar_t *p) {
  51     if (!ustricmp(p, L"centre") || !ustricmp(p, L"center"))
  52         return CENTRE;
  53     if (!ustricmp(p, L"leftplus"))
  54         return LEFTPLUS;
  55     return LEFT;
  56 }
  57
  58 static textconfig text_configure(paragraph *source) {
  59     textconfig ret;
  60     paragraph *p;
  61     int n;
  62
  63     /*
  64      * Non-negotiables.
  65      */
  66     ret.bullet.next = NULL;
  67     ret.bullet.alt = NULL;
  68     ret.bullet.type = word_Normal;
  69     ret.atitle.just_numbers = FALSE;   /* ignored */
  70
  71     /*
  72      * Defaults.
  73      */
  74     ret.indent = 7;
  75     ret.indent_code = 2;
  76     ret.listindentbefore = 1;
  77     ret.listindentafter = 3;
  78     ret.width = 68;
  79     ret.atitle.align = CENTRE;
  80     ret.atitle.underline = L"\x2550\0=\0\0";
  81     ret.achapter.align = LEFT;
  82     ret.achapter.just_numbers = FALSE;
  83     ret.achapter.number_suffix = L": ";
  84     ret.achapter.underline = L"\x203E\0-\0\0";
  85     ret.nasect = 1;
  86     ret.asect = mknewa(alignstruct, ret.nasect);
  87     ret.asect[0].align = LEFTPLUS;
  88     ret.asect[0].just_numbers = TRUE;
  89     ret.asect[0].number_suffix = L" ";
  90     ret.asect[0].underline = L"\0";
  91     ret.include_version_id = TRUE;
  92     ret.indent_preambles = FALSE;
  93     ret.bullet.text = L"\x2022\0-\0\0";
  94     ret.rule = L"\x2500\0-\0\0";
  95     ret.filename = dupstr("output.txt");
  96     ret.startemph = ret.endemph = L"_";
  97     ret.listsuffix = L".";
  98     ret.charset = CS_ASCII;
  99     /*
 100      * Default quote characters are Unicode matched single quotes,
 101      * falling back to the TeXlike `'.
 102      */
 103     ret.lquote = L"\x2018\0\x2019\0`\0'\0\0";
 104     ret.rquote = uadv(ret.lquote);
 105
 106     /*
 107      * Two-pass configuration so that we can pick up global config
 108      * (e.g. `quotes') before having it overridden by specific
 109      * config (`text-quotes'), irrespective of the order in which
 110      * they occur.
 111      */
 112     for (p = source; p; p = p->next) {
 113         if (p->type == para_Config) {
 114             if (!ustricmp(p->keyword, L"quotes")) {
 115                 if (*uadv(p->keyword) && *uadv(uadv(p->keyword))) {
 116                     ret.lquote = uadv(p->keyword);
 117                     ret.rquote = uadv(ret.lquote);
 118                 }
 119             }
 120         }
 121     }
 122
 123     for (p = source; p; p = p->next) {
 124         if (p->type == para_Config) {
 125             if (!ustricmp(p->keyword, L"text-indent")) {
 126                 ret.indent = utoi(uadv(p->keyword));
 127             } else if (!ustricmp(p->keyword, L"text-charset")) {
 128                 char *csname = utoa_dup(uadv(p->keyword), CS_ASCII);
 129                 ret.charset = charset_from_localenc(csname);
 130                 sfree(csname);
 131             } else if (!ustricmp(p->keyword, L"text-filename")) {
 132                 sfree(ret.filename);
 133                 ret.filename = dupstr(adv(p->origkeyword));
 134             } else if (!ustricmp(p->keyword, L"text-indent-code")) {
 135                 ret.indent_code = utoi(uadv(p->keyword));
 136             } else if (!ustricmp(p->keyword, L"text-width")) {
 137                 ret.width = utoi(uadv(p->keyword));
 138             } else if (!ustricmp(p->keyword, L"text-list-indent")) {
 139                 ret.listindentbefore = utoi(uadv(p->keyword));
 140             } else if (!ustricmp(p->keyword, L"text-listitem-indent")) {
 141                 ret.listindentafter = utoi(uadv(p->keyword));
 142             } else if (!ustricmp(p->keyword, L"text-chapter-align")) {
 143                 ret.achapter.align = utoalign(uadv(p->keyword));
 144             } else if (!ustricmp(p->keyword, L"text-chapter-underline")) {
 145                 ret.achapter.underline = uadv(p->keyword);
 146             } else if (!ustricmp(p->keyword, L"text-chapter-numeric")) {
 147                 ret.achapter.just_numbers = utob(uadv(p->keyword));
 148             } else if (!ustricmp(p->keyword, L"text-chapter-suffix")) {
 149                 ret.achapter.number_suffix = uadv(p->keyword);
 150             } else if (!ustricmp(p->keyword, L"text-section-align")) {
 151                 wchar_t *q = uadv(p->keyword);
 152                 int n = 0;
 153                 if (uisdigit(*q)) {
 154                     n = utoi(q);
 155                     q = uadv(q);
 156                 }
 157                 if (n >= ret.nasect) {
 158                     int i;
 159                     ret.asect = resize(ret.asect, n+1);
 160                     for (i = ret.nasect; i <= n; i++)
 161                         ret.asect[i] = ret.asect[ret.nasect-1];
 162                     ret.nasect = n+1;
 163                 }
 164                 ret.asect[n].align = utoalign(q);
 165             } else if (!ustricmp(p->keyword, L"text-section-underline")) {
 166                 wchar_t *q = uadv(p->keyword);
 167                 int n = 0;
 168                 if (uisdigit(*q)) {
 169                     n = utoi(q);
 170                     q = uadv(q);
 171                 }
 172                 if (n >= ret.nasect) {
 173                     int i;
 174                     ret.asect = resize(ret.asect, n+1);
 175                     for (i = ret.nasect; i <= n; i++)
 176                         ret.asect[i] = ret.asect[ret.nasect-1];
 177                     ret.nasect = n+1;
 178                 }
 179                 ret.asect[n].underline = q;
 180             } else if (!ustricmp(p->keyword, L"text-section-numeric")) {
 181                 wchar_t *q = uadv(p->keyword);
 182                 int n = 0;
 183                 if (uisdigit(*q)) {
 184                     n = utoi(q);
 185                     q = uadv(q);
 186                 }
 187                 if (n >= ret.nasect) {
 188                     int i;
 189                     ret.asect = resize(ret.asect, n+1);
 190                     for (i = ret.nasect; i <= n; i++)
 191                         ret.asect[i] = ret.asect[ret.nasect-1];
 192                     ret.nasect = n+1;
 193                 }
 194                 ret.asect[n].just_numbers = utob(q);
 195             } else if (!ustricmp(p->keyword, L"text-section-suffix")) {
 196                 wchar_t *q = uadv(p->keyword);
 197                 int n = 0;
 198                 if (uisdigit(*q)) {
 199                     n = utoi(q);
 200                     q = uadv(q);
 201                 }
 202                 if (n >= ret.nasect) {
 203                     int i;
 204                     ret.asect = resize(ret.asect, n+1);
 205                     for (i = ret.nasect; i <= n; i++) {
 206                         ret.asect[i] = ret.asect[ret.nasect-1];
 207                     }
 208                     ret.nasect = n+1;
 209                 }
 210                 ret.asect[n].number_suffix = q;
 211             } else if (!ustricmp(p->keyword, L"text-title-align")) {
 212                 ret.atitle.align = utoalign(uadv(p->keyword));
 213             } else if (!ustricmp(p->keyword, L"text-title-underline")) {
 214                 ret.atitle.underline = uadv(p->keyword);
 215             } else if (!ustricmp(p->keyword, L"text-versionid")) {
 216                 ret.include_version_id = utob(uadv(p->keyword));
 217             } else if (!ustricmp(p->keyword, L"text-indent-preamble")) {
 218                 ret.indent_preambles = utob(uadv(p->keyword));
 219             } else if (!ustricmp(p->keyword, L"text-bullet")) {
 220                 ret.bullet.text = uadv(p->keyword);
 221             } else if (!ustricmp(p->keyword, L"text-rule")) {
 222                 ret.rule = uadv(p->keyword);
 223             } else if (!ustricmp(p->keyword, L"text-list-suffix")) {
 224                 ret.listsuffix = uadv(p->keyword);
 225             } else if (!ustricmp(p->keyword, L"text-emphasis")) {
 226                 if (*uadv(p->keyword) && *uadv(uadv(p->keyword))) {
 227                     ret.startemph = uadv(p->keyword);
 228                     ret.endemph = uadv(ret.startemph);
 229                 }
 230             } else if (!ustricmp(p->keyword, L"text-quotes")) {
 231                 if (*uadv(p->keyword) && *uadv(uadv(p->keyword))) {
 232                     ret.lquote = uadv(p->keyword);
 233                     ret.rquote = uadv(ret.lquote);
 234                 }
 235             }
 236         }
 237     }
 238
 239     /*
 240      * Now process fallbacks on quote characters, underlines, the
 241      * rule character, the emphasis characters, and bullets.
 242      */
 243     while (*uadv(ret.rquote) && *uadv(uadv(ret.rquote)) &&
 244            (!cvt_ok(ret.charset, ret.lquote) ||
 245             !cvt_ok(ret.charset, ret.rquote))) {
 246         ret.lquote = uadv(ret.rquote);
 247         ret.rquote = uadv(ret.lquote);
 248     }
 249
 250     while (*uadv(ret.endemph) && *uadv(uadv(ret.endemph)) &&
 251            (!cvt_ok(ret.charset, ret.startemph) ||
 252             !cvt_ok(ret.charset, ret.endemph))) {
 253         ret.startemph = uadv(ret.endemph);
 254         ret.endemph = uadv(ret.startemph);
 255     }
 256
 257     while (*ret.atitle.underline && *uadv(ret.atitle.underline) &&
 258            !cvt_ok(ret.charset, ret.atitle.underline))
 259         ret.atitle.underline = uadv(ret.atitle.underline);
 260
 261     while (*ret.achapter.underline && *uadv(ret.achapter.underline) &&
 262            !cvt_ok(ret.charset, ret.achapter.underline))
 263         ret.achapter.underline = uadv(ret.achapter.underline);
 264
 265     for (n = 0; n < ret.nasect; n++) {
 266         while (*ret.asect[n].underline && *uadv(ret.asect[n].underline) &&
 267                !cvt_ok(ret.charset, ret.asect[n].underline))
 268             ret.asect[n].underline = uadv(ret.asect[n].underline);
 269     }
 270
 271     while (*ret.bullet.text && *uadv(ret.bullet.text) &&
 272            !cvt_ok(ret.charset, ret.bullet.text))
 273         ret.bullet.text = uadv(ret.bullet.text);
 274
 275     while (*ret.rule && *uadv(ret.rule) &&
 276            !cvt_ok(ret.charset, ret.rule))
 277         ret.rule = uadv(ret.rule);
 278
 279     return ret;
 280 }
 281
 282 paragraph *text_config_filename(char *filename)
 283 {
 284     return cmdline_cfg_simple("text-filename", filename, NULL);
 285 }
 286
 287 void text_backend(paragraph *sourceform, keywordlist *keywords,
 288                   indexdata *idx, void *unused) {
 289     paragraph *p;
 290     textconfig conf;
 291     word *prefix, *body, *wp;
 292     word spaceword;
 293     textfile tf;
 294     wchar_t *prefixextra;
 295     int nesting, nestindent;
 296     int indentb, indenta;
 297
 298     IGNORE(unused);
 299     IGNORE(keywords);                  /* we don't happen to need this */
 300     IGNORE(idx);                       /* or this */
 301
 302     conf = text_configure(sourceform);
 303
 304     /*
 305      * Open the output file.
 306      */
 307     tf.fp = fopen(conf.filename, "w");
 308     if (!tf.fp) {
 309         error(err_cantopenw, conf.filename);
 310         return;
 311     }
 312     tf.charset = conf.charset;
 313     tf.state = charset_init_state;
 314
 315     /* Do the title */
 316     for (p = sourceform; p; p = p->next)
 317         if (p->type == para_Title)
 318             text_heading(&tf, NULL, NULL, p->words,
 319                          conf.atitle, conf.indent, conf.width, &conf);
 320
 321     nestindent = conf.listindentbefore + conf.listindentafter;
 322     nesting = (conf.indent_preambles ? 0 : -conf.indent);
 323
 324     /* Do the main document */
 325     for (p = sourceform; p; p = p->next) switch (p->type) {
 326
 327       case para_QuotePush:
 328         nesting += 2;
 329         break;
 330       case para_QuotePop:
 331         nesting -= 2;
 332         assert(nesting >= 0);
 333         break;
 334
 335       case para_LcontPush:
 336         nesting += nestindent;
 337         break;
 338       case para_LcontPop:
 339         nesting -= nestindent;
 340         assert(nesting >= 0);
 341         break;
 342
 343         /*
 344          * Things we ignore because we've already processed them or
 345          * aren't going to touch them in this pass.
 346          */
 347       case para_IM:
 348       case para_BR:
 349       case para_Biblio:                /* only touch BiblioCited */
 350       case para_VersionID:
 351       case para_NoCite:
 352       case para_Title:
 353         break;
 354
 355         /*
 356          * Chapter titles.
 357          */
 358       case para_Chapter:
 359       case para_Appendix:
 360       case para_UnnumberedChapter:
 361         text_heading(&tf, p->kwtext, p->kwtext2, p->words,
 362                      conf.achapter, conf.indent, conf.width, &conf);
 363         nesting = 0;
 364         break;
 365
 366       case para_Heading:
 367       case para_Subsect:
 368         text_heading(&tf, p->kwtext, p->kwtext2, p->words,
 369                      conf.asect[p->aux>=conf.nasect ? conf.nasect-1 : p->aux],
 370                      conf.indent, conf.width, &conf);
 371         break;
 372
 373       case para_Rule:
 374         text_rule(&tf, conf.indent + nesting, conf.width - nesting, &conf);
 375         break;
 376
 377       case para_Normal:
 378       case para_Copyright:
 379       case para_DescribedThing:
 380       case para_Description:
 381       case para_BiblioCited:
 382       case para_Bullet:
 383       case para_NumberedList:
 384         if (p->type == para_Bullet) {
 385             prefix = &conf.bullet;
 386             prefixextra = NULL;
 387             indentb = conf.listindentbefore;
 388             indenta = conf.listindentafter;
 389         } else if (p->type == para_NumberedList) {
 390             prefix = p->kwtext;
 391             prefixextra = conf.listsuffix;
 392             indentb = conf.listindentbefore;
 393             indenta = conf.listindentafter;
 394         } else if (p->type == para_Description) {
 395             prefix = NULL;
 396             prefixextra = NULL;
 397             indentb = conf.listindentbefore;
 398             indenta = conf.listindentafter;
 399         } else {
 400             prefix = NULL;
 401             prefixextra = NULL;
 402             indentb = indenta = 0;
 403         }
 404         if (p->type == para_BiblioCited) {
 405             body = dup_word_list(p->kwtext);
 406             for (wp = body; wp->next; wp = wp->next);
 407             wp->next = &spaceword;
 408             spaceword.next = p->words;
 409             spaceword.alt = NULL;
 410             spaceword.type = word_WhiteSpace;
 411             spaceword.text = NULL;
 412         } else {
 413             wp = NULL;
 414             body = p->words;
 415         }
 416         text_para(&tf, prefix, prefixextra, body,
 417                   conf.indent + nesting + indentb, indenta,
 418                   conf.width - nesting - indentb - indenta, &conf);
 419         if (wp) {
 420             wp->next = NULL;
 421             free_word_list(body);
 422         }
 423         break;
 424
 425       case para_Code:
 426         text_codepara(&tf, p->words,
 427                       conf.indent + nesting + conf.indent_code,
 428                       conf.width - nesting - 2 * conf.indent_code);
 429         break;
 430     }
 431
 432     /* Do the version ID */
 433     if (conf.include_version_id) {
 434         for (p = sourceform; p; p = p->next)
 435             if (p->type == para_VersionID)
 436                 text_versionid(&tf, p->words, &conf);
 437     }
 438
 439     /*
 440      * Tidy up
 441      */
 442     text_output(&tf, NULL);            /* end charset conversion */
 443     fclose(tf.fp);
 444     sfree(conf.asect);
 445     sfree(conf.filename);
 446 }
 447
 448 static void text_output(textfile *tf, const wchar_t *s)
 449 {
 450     char buf[256];
 451     int ret, len;
 452     const wchar_t **sp;
 453
 454     if (!s) {
 455         sp = NULL;
 456         len = 1;
 457     } else {
 458         sp = &s;
 459         len = ustrlen(s);
 460     }
 461
 462     while (len > 0) {
 463         ret = charset_from_unicode(sp, &len, buf, lenof(buf),
 464                                    tf->charset, &tf->state, NULL);
 465         if (!sp)
 466             len = 0;
 467         fwrite(buf, 1, ret, tf->fp);
 468     }
 469 }
 470
 471 static void text_output_many(textfile *tf, int n, wchar_t c)
 472 {
 473     wchar_t s[2];
 474     s[0] = c;
 475     s[1] = L'\0';
 476     while (n--)
 477         text_output(tf, s);
 478 }
 479
 480 static void text_rdaddw(rdstring *rs, word *text, word *end, textconfig *cfg) {
 481     for (; text && text != end; text = text->next) switch (text->type) {
 482       case word_HyperLink:
 483       case word_HyperEnd:
 484       case word_UpperXref:
 485       case word_LowerXref:
 486       case word_XrefEnd:
 487       case word_IndexRef:
 488         break;
 489
 490       case word_Normal:
 491       case word_Emph:
 492       case word_Code:
 493       case word_WeakCode:
 494       case word_WhiteSpace:
 495       case word_EmphSpace:
 496       case word_CodeSpace:
 497       case word_WkCodeSpace:
 498       case word_Quote:
 499       case word_EmphQuote:
 500       case word_CodeQuote:
 501       case word_WkCodeQuote:
 502         assert(text->type != word_CodeQuote &&
 503                text->type != word_WkCodeQuote);
 504         if (towordstyle(text->type) == word_Emph &&
 505             (attraux(text->aux) == attr_First ||
 506              attraux(text->aux) == attr_Only))
 507             rdadds(rs, cfg->startemph);
 508         else if (towordstyle(text->type) == word_Code &&
 509                  (attraux(text->aux) == attr_First ||
 510                   attraux(text->aux) == attr_Only))
 511             rdadds(rs, cfg->lquote);
 512         if (removeattr(text->type) == word_Normal) {
 513             if (cvt_ok(cfg->charset, text->text) || !text->alt)
 514                 rdadds(rs, text->text);
 515             else
 516                 text_rdaddw(rs, text->alt, NULL, cfg);
 517         } else if (removeattr(text->type) == word_WhiteSpace) {
 518             rdadd(rs, L' ');
 519         } else if (removeattr(text->type) == word_Quote) {
 520             rdadds(rs, quoteaux(text->aux) == quote_Open ?
 521                    cfg->lquote : cfg->rquote);
 522         }
 523         if (towordstyle(text->type) == word_Emph &&
 524             (attraux(text->aux) == attr_Last ||
 525              attraux(text->aux) == attr_Only))
 526             rdadds(rs, cfg->endemph);
 527         else if (towordstyle(text->type) == word_Code &&
 528                  (attraux(text->aux) == attr_Last ||
 529                   attraux(text->aux) == attr_Only))
 530             rdadds(rs, cfg->rquote);
 531         break;
 532     }
 533 }
 534
 535 static int text_width(void *, word *);
 536
 537 static int text_width_list(void *ctx, word *text) {
 538     int w = 0;
 539     while (text) {
 540         w += text_width(ctx, text);
 541         text = text->next;
 542     }
 543     return w;
 544 }
 545
 546 static int text_width(void *ctx, word *text) {
 547     textconfig *cfg = (textconfig *)ctx;
 548     int wid;
 549     int attr;
 550
 551     switch (text->type) {
 552       case word_HyperLink:
 553       case word_HyperEnd:
 554       case word_UpperXref:
 555       case word_LowerXref:
 556       case word_XrefEnd:
 557       case word_IndexRef:
 558         return 0;
 559     }
 560
 561     assert(text->type < word_internal_endattrs);
 562
 563     wid = 0;
 564     attr = towordstyle(text->type);
 565     if (attr == word_Emph || attr == word_Code) {
 566         if (attraux(text->aux) == attr_Only ||
 567             attraux(text->aux) == attr_First)
 568             wid += ustrwid(attr == word_Emph ? cfg->startemph : cfg->lquote,
 569                            cfg->charset);
 570     }
 571     if (attr == word_Emph || attr == word_Code) {
 572         if (attraux(text->aux) == attr_Only ||
 573             attraux(text->aux) == attr_Last)
 574             wid += ustrwid(attr == word_Emph ? cfg->startemph : cfg->lquote,
 575                            cfg->charset);
 576     }
 577
 578     switch (text->type) {
 579       case word_Normal:
 580       case word_Emph:
 581       case word_Code:
 582       case word_WeakCode:
 583         if (cvt_ok(cfg->charset, text->text) || !text->alt)
 584             wid += ustrwid(text->text, cfg->charset);
 585         else
 586             wid += text_width_list(ctx, text->alt);
 587         return wid;
 588
 589       case word_WhiteSpace:
 590       case word_EmphSpace:
 591       case word_CodeSpace:
 592       case word_WkCodeSpace:
 593       case word_Quote:
 594       case word_EmphQuote:
 595       case word_CodeQuote:
 596       case word_WkCodeQuote:
 597         assert(text->type != word_CodeQuote &&
 598                text->type != word_WkCodeQuote);
 599         if (removeattr(text->type) == word_Quote) {
 600             if (quoteaux(text->aux) == quote_Open)
 601                 wid += ustrwid(cfg->lquote, cfg->charset);
 602             else
 603                 wid += ustrwid(cfg->rquote, cfg->charset);
 604         } else
 605             wid++;                     /* space */
 606     }
 607
 608     return wid;
 609 }
 610
 611 static void text_heading(textfile *tf, word *tprefix, word *nprefix,
 612                          word *text, alignstruct align,
 613                          int indent, int width, textconfig *cfg) {
 614     rdstring t = { 0, 0, NULL };
 615     int margin, length;
 616     int firstlinewidth, wrapwidth;
 617     wrappedline *wrapping, *p;
 618
 619     if (align.just_numbers && nprefix) {
 620         text_rdaddw(&t, nprefix, NULL, cfg);
 621         rdadds(&t, align.number_suffix);
 622     } else if (!align.just_numbers && tprefix) {
 623         text_rdaddw(&t, tprefix, NULL, cfg);
 624         rdadds(&t, align.number_suffix);
 625     }
 626     margin = length = ustrwid(t.text ? t.text : L"", cfg->charset);
 627
 628     if (align.align == LEFTPLUS) {
 629         margin = indent - margin;
 630         if (margin < 0) margin = 0;
 631         firstlinewidth = indent + width - margin - length;
 632         wrapwidth = width;
 633     } else if (align.align == LEFT || align.align == CENTRE) {
 634         margin = 0;
 635         firstlinewidth = indent + width - length;
 636         wrapwidth = indent + width;
 637     }
 638
 639     wrapping = wrap_para(text, firstlinewidth, wrapwidth,
 640                          text_width, cfg, 0);
 641     for (p = wrapping; p; p = p->next) {
 642         text_rdaddw(&t, p->begin, p->end, cfg);
 643         length = ustrwid(t.text ? t.text : L"", cfg->charset);
 644         if (align.align == CENTRE) {
 645             margin = (indent + width - length)/2;
 646             if (margin < 0) margin = 0;
 647         }
 648         text_output_many(tf, margin, L' ');
 649         text_output(tf, t.text);
 650         text_output(tf, L"\n");
 651         if (*align.underline) {
 652             text_output_many(tf, margin, L' ');
 653             while (length > 0) {
 654                 text_output(tf, align.underline);
 655                 length -= ustrwid(align.underline, cfg->charset);
 656             }
 657             text_output(tf, L"\n");
 658         }
 659         if (align.align == LEFTPLUS)
 660             margin = indent;
 661         else
 662             margin = 0;
 663         sfree(t.text);
 664         t = empty_rdstring;
 665     }
 666     wrap_free(wrapping);
 667     text_output(tf, L"\n");
 668
 669     sfree(t.text);
 670 }
 671
 672 static void text_rule(textfile *tf, int indent, int width, textconfig *cfg) {
 673     text_output_many(tf, indent, L' ');
 674     while (width > 0) {
 675         text_output(tf, cfg->rule);
 676         width -= ustrwid(cfg->rule, cfg->charset);
 677     }
 678     text_output_many(tf, 2, L'\n');
 679 }
 680
 681 static void text_para(textfile *tf, word *prefix, wchar_t *prefixextra,
 682                       word *text, int indent, int extraindent, int width,
 683                       textconfig *cfg) {
 684     wrappedline *wrapping, *p;
 685     rdstring pfx = { 0, 0, NULL };
 686     int e;
 687     int firstlinewidth = width;
 688
 689     if (prefix) {
 690         text_rdaddw(&pfx, prefix, NULL, cfg);
 691         if (prefixextra)
 692             rdadds(&pfx, prefixextra);
 693         text_output_many(tf, indent, L' ');
 694         text_output(tf, pfx.text);
 695         /* If the prefix is too long, shorten the first line to fit. */
 696         e = extraindent - ustrwid(pfx.text ? pfx.text : L"", cfg->charset);
 697         if (e < 0) {
 698             firstlinewidth += e;       /* this decreases it, since e < 0 */
 699             if (firstlinewidth < 0) {
 700                 e = indent + extraindent;
 701                 firstlinewidth = width;
 702                 text_output(tf, L"\n");
 703             } else
 704                 e = 0;
 705         }
 706         sfree(pfx.text);
 707     } else
 708         e = indent + extraindent;
 709
 710     wrapping = wrap_para(text, firstlinewidth, width,
 711                          text_width, cfg, 0);
 712     for (p = wrapping; p; p = p->next) {
 713         rdstring t = { 0, 0, NULL };
 714         text_rdaddw(&t, p->begin, p->end, cfg);
 715         text_output_many(tf, e, L' ');
 716         text_output(tf, t.text);
 717         text_output(tf, L"\n");
 718         e = indent + extraindent;
 719         sfree(t.text);
 720     }
 721     wrap_free(wrapping);
 722     text_output(tf, L"\n");
 723 }
 724
 725 static void text_codepara(textfile *tf, word *text, int indent, int width) {
 726     for (; text; text = text->next) if (text->type == word_WeakCode) {
 727         int wid = ustrwid(text->text, tf->charset);
 728         if (wid > width)
 729             error(err_text_codeline, &text->fpos, wid, width);
 730         text_output_many(tf, indent, L' ');
 731         text_output(tf, text->text);
 732         text_output(tf, L"\n");
 733     }
 734
 735     text_output(tf, L"\n");
 736 }
 737
 738 static void text_versionid(textfile *tf, word *text, textconfig *cfg) {
 739     rdstring t = { 0, 0, NULL };
 740
 741     rdadd(&t, L'[');
 742     text_rdaddw(&t, text, NULL, cfg);
 743     rdadd(&t, L']');
 744     rdadd(&t, L'\n');
 745
 746     text_output(tf, t.text);
 747     sfree(t.text);
 748 }