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 number_at_all, 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     ret.atitle.number_at_all = TRUE;   /* ignored */
  71
  72     /*
  73      * Defaults.
  74      */
  75     ret.indent = 7;
  76     ret.indent_code = 2;
  77     ret.listindentbefore = 1;
  78     ret.listindentafter = 3;
  79     ret.width = 68;
  80     ret.atitle.align = CENTRE;
  81     ret.atitle.underline = L"\x2550\0=\0\0";
  82     ret.achapter.align = LEFT;
  83     ret.achapter.just_numbers = FALSE;
  84     ret.achapter.number_at_all = TRUE;
  85     ret.achapter.number_suffix = L": ";
  86     ret.achapter.underline = L"\x203E\0-\0\0";
  87     ret.nasect = 1;
  88     ret.asect = snewn(ret.nasect, alignstruct);
  89     ret.asect[0].align = LEFTPLUS;
  90     ret.asect[0].just_numbers = TRUE;
  91     ret.asect[0].number_at_all = TRUE;
  92     ret.asect[0].number_suffix = L" ";
  93     ret.asect[0].underline = L"\0";
  94     ret.include_version_id = TRUE;
  95     ret.indent_preambles = FALSE;
  96     ret.bullet.text = L"\x2022\0-\0\0";
  97     ret.rule = L"\x2500\0-\0\0";
  98     ret.filename = dupstr("output.txt");
  99     ret.startemph = L"_\0_\0\0";
 100     ret.endemph = uadv(ret.startemph);
 101     ret.listsuffix = L".";
 102     ret.charset = CS_ASCII;
 103     /*
 104      * Default quote characters are Unicode matched single quotes,
 105      * falling back to the TeXlike `'.
 106      */
 107     ret.lquote = L"\x2018\0\x2019\0`\0'\0\0";
 108     ret.rquote = uadv(ret.lquote);
 109
 110     /*
 111      * Two-pass configuration so that we can pick up global config
 112      * (e.g. `quotes') before having it overridden by specific
 113      * config (`text-quotes'), irrespective of the order in which
 114      * they occur.
 115      */
 116     for (p = source; p; p = p->next) {
 117         if (p->type == para_Config) {
 118             if (!ustricmp(p->keyword, L"quotes")) {
 119                 if (*uadv(p->keyword) && *uadv(uadv(p->keyword))) {
 120                     ret.lquote = uadv(p->keyword);
 121                     ret.rquote = uadv(ret.lquote);
 122                 }
 123             }
 124         }
 125     }
 126
 127     for (p = source; p; p = p->next) {
 128         if (p->type == para_Config) {
 129             if (!ustricmp(p->keyword, L"text-indent")) {
 130                 ret.indent = utoi(uadv(p->keyword));
 131             } else if (!ustricmp(p->keyword, L"text-charset")) {
 132                 ret.charset = charset_from_ustr(&p->fpos, uadv(p->keyword));
 133             } else if (!ustricmp(p->keyword, L"text-filename")) {
 134                 sfree(ret.filename);
 135                 ret.filename = dupstr(adv(p->origkeyword));
 136             } else if (!ustricmp(p->keyword, L"text-indent-code")) {
 137                 ret.indent_code = utoi(uadv(p->keyword));
 138             } else if (!ustricmp(p->keyword, L"text-width")) {
 139                 ret.width = utoi(uadv(p->keyword));
 140             } else if (!ustricmp(p->keyword, L"text-list-indent")) {
 141                 ret.listindentbefore = utoi(uadv(p->keyword));
 142             } else if (!ustricmp(p->keyword, L"text-listitem-indent")) {
 143                 ret.listindentafter = utoi(uadv(p->keyword));
 144             } else if (!ustricmp(p->keyword, L"text-chapter-align")) {
 145                 ret.achapter.align = utoalign(uadv(p->keyword));
 146             } else if (!ustricmp(p->keyword, L"text-chapter-underline")) {
 147                 ret.achapter.underline = uadv(p->keyword);
 148             } else if (!ustricmp(p->keyword, L"text-chapter-numeric")) {
 149                 ret.achapter.just_numbers = utob(uadv(p->keyword));
 150             } else if (!ustricmp(p->keyword, L"text-chapter-shownumber")) {
 151                 ret.achapter.number_at_all = utob(uadv(p->keyword));
 152             } else if (!ustricmp(p->keyword, L"text-chapter-suffix")) {
 153                 ret.achapter.number_suffix = uadv(p->keyword);
 154             } else if (!ustricmp(p->keyword, L"text-section-align")) {
 155                 wchar_t *q = uadv(p->keyword);
 156                 int n = 0;
 157                 if (uisdigit(*q)) {
 158                     n = utoi(q);
 159                     q = uadv(q);
 160                 }
 161                 if (n >= ret.nasect) {
 162                     int i;
 163                     ret.asect = sresize(ret.asect, n+1, alignstruct);
 164                     for (i = ret.nasect; i <= n; i++)
 165                         ret.asect[i] = ret.asect[ret.nasect-1];
 166                     ret.nasect = n+1;
 167                 }
 168                 ret.asect[n].align = utoalign(q);
 169             } else if (!ustricmp(p->keyword, L"text-section-underline")) {
 170                 wchar_t *q = uadv(p->keyword);
 171                 int n = 0;
 172                 if (uisdigit(*q)) {
 173                     n = utoi(q);
 174                     q = uadv(q);
 175                 }
 176                 if (n >= ret.nasect) {
 177                     int i;
 178                     ret.asect = sresize(ret.asect, n+1, alignstruct);
 179                     for (i = ret.nasect; i <= n; i++)
 180                         ret.asect[i] = ret.asect[ret.nasect-1];
 181                     ret.nasect = n+1;
 182                 }
 183                 ret.asect[n].underline = q;
 184             } else if (!ustricmp(p->keyword, L"text-section-numeric")) {
 185                 wchar_t *q = uadv(p->keyword);
 186                 int n = 0;
 187                 if (uisdigit(*q)) {
 188                     n = utoi(q);
 189                     q = uadv(q);
 190                 }
 191                 if (n >= ret.nasect) {
 192                     int i;
 193                     ret.asect = sresize(ret.asect, n+1, alignstruct);
 194                     for (i = ret.nasect; i <= n; i++)
 195                         ret.asect[i] = ret.asect[ret.nasect-1];
 196                     ret.nasect = n+1;
 197                 }
 198                 ret.asect[n].just_numbers = utob(q);
 199             } else if (!ustricmp(p->keyword, L"text-section-shownumber")) {
 200                 wchar_t *q = uadv(p->keyword);
 201                 int n = 0;
 202                 if (uisdigit(*q)) {
 203                     n = utoi(q);
 204                     q = uadv(q);
 205                 }
 206                 if (n >= ret.nasect) {
 207                     int i;
 208                     ret.asect = sresize(ret.asect, n+1, alignstruct);
 209                     for (i = ret.nasect; i <= n; i++)
 210                         ret.asect[i] = ret.asect[ret.nasect-1];
 211                     ret.nasect = n+1;
 212                 }
 213                 ret.asect[n].number_at_all = utob(q);
 214             } else if (!ustricmp(p->keyword, L"text-section-suffix")) {
 215                 wchar_t *q = uadv(p->keyword);
 216                 int n = 0;
 217                 if (uisdigit(*q)) {
 218                     n = utoi(q);
 219                     q = uadv(q);
 220                 }
 221                 if (n >= ret.nasect) {
 222                     int i;
 223                     ret.asect = sresize(ret.asect, n+1, alignstruct);
 224                     for (i = ret.nasect; i <= n; i++) {
 225                         ret.asect[i] = ret.asect[ret.nasect-1];
 226                     }
 227                     ret.nasect = n+1;
 228                 }
 229                 ret.asect[n].number_suffix = q;
 230             } else if (!ustricmp(p->keyword, L"text-title-align")) {
 231                 ret.atitle.align = utoalign(uadv(p->keyword));
 232             } else if (!ustricmp(p->keyword, L"text-title-underline")) {
 233                 ret.atitle.underline = uadv(p->keyword);
 234             } else if (!ustricmp(p->keyword, L"text-versionid")) {
 235                 ret.include_version_id = utob(uadv(p->keyword));
 236             } else if (!ustricmp(p->keyword, L"text-indent-preamble")) {
 237                 ret.indent_preambles = utob(uadv(p->keyword));
 238             } else if (!ustricmp(p->keyword, L"text-bullet")) {
 239                 ret.bullet.text = uadv(p->keyword);
 240             } else if (!ustricmp(p->keyword, L"text-rule")) {
 241                 ret.rule = uadv(p->keyword);
 242             } else if (!ustricmp(p->keyword, L"text-list-suffix")) {
 243                 ret.listsuffix = uadv(p->keyword);
 244             } else if (!ustricmp(p->keyword, L"text-emphasis")) {
 245                 if (*uadv(p->keyword) && *uadv(uadv(p->keyword))) {
 246                     ret.startemph = uadv(p->keyword);
 247                     ret.endemph = uadv(ret.startemph);
 248                 }
 249             } else if (!ustricmp(p->keyword, L"text-quotes")) {
 250                 if (*uadv(p->keyword) && *uadv(uadv(p->keyword))) {
 251                     ret.lquote = uadv(p->keyword);
 252                     ret.rquote = uadv(ret.lquote);
 253                 }
 254             }
 255         }
 256     }
 257
 258     /*
 259      * Now process fallbacks on quote characters, underlines, the
 260      * rule character, the emphasis characters, and bullets.
 261      */
 262     while (*uadv(ret.rquote) && *uadv(uadv(ret.rquote)) &&
 263            (!cvt_ok(ret.charset, ret.lquote) ||
 264             !cvt_ok(ret.charset, ret.rquote))) {
 265         ret.lquote = uadv(ret.rquote);
 266         ret.rquote = uadv(ret.lquote);
 267     }
 268
 269     while (*uadv(ret.endemph) && *uadv(uadv(ret.endemph)) &&
 270            (!cvt_ok(ret.charset, ret.startemph) ||
 271             !cvt_ok(ret.charset, ret.endemph))) {
 272         ret.startemph = uadv(ret.endemph);
 273         ret.endemph = uadv(ret.startemph);
 274     }
 275
 276     while (*ret.atitle.underline && *uadv(ret.atitle.underline) &&
 277            !cvt_ok(ret.charset, ret.atitle.underline))
 278         ret.atitle.underline = uadv(ret.atitle.underline);
 279
 280     while (*ret.achapter.underline && *uadv(ret.achapter.underline) &&
 281            !cvt_ok(ret.charset, ret.achapter.underline))
 282         ret.achapter.underline = uadv(ret.achapter.underline);
 283
 284     for (n = 0; n < ret.nasect; n++) {
 285         while (*ret.asect[n].underline && *uadv(ret.asect[n].underline) &&
 286                !cvt_ok(ret.charset, ret.asect[n].underline))
 287             ret.asect[n].underline = uadv(ret.asect[n].underline);
 288     }
 289
 290     while (*ret.bullet.text && *uadv(ret.bullet.text) &&
 291            !cvt_ok(ret.charset, ret.bullet.text))
 292         ret.bullet.text = uadv(ret.bullet.text);
 293
 294     while (*ret.rule && *uadv(ret.rule) &&
 295            !cvt_ok(ret.charset, ret.rule))
 296         ret.rule = uadv(ret.rule);
 297
 298     return ret;
 299 }
 300
 301 paragraph *text_config_filename(char *filename)
 302 {
 303     return cmdline_cfg_simple("text-filename", filename, NULL);
 304 }
 305
 306 void text_backend(paragraph *sourceform, keywordlist *keywords,
 307                   indexdata *idx, void *unused) {
 308     paragraph *p;
 309     textconfig conf;
 310     word *prefix, *body, *wp;
 311     word spaceword;
 312     textfile tf;
 313     wchar_t *prefixextra;
 314     int nesting, nestbase, nestindent;
 315     int indentb, indenta;
 316
 317     IGNORE(unused);
 318     IGNORE(keywords);                  /* we don't happen to need this */
 319     IGNORE(idx);                       /* or this */
 320
 321     conf = text_configure(sourceform);
 322
 323     /*
 324      * Open the output file.
 325      */
 326     tf.fp = fopen(conf.filename, "w");
 327     if (!tf.fp) {
 328         error(err_cantopenw, conf.filename);
 329         return;
 330     }
 331     tf.charset = conf.charset;
 332     tf.state = charset_init_state;
 333
 334     /* Do the title */
 335     for (p = sourceform; p; p = p->next)
 336         if (p->type == para_Title)
 337             text_heading(&tf, NULL, NULL, p->words,
 338                          conf.atitle, conf.indent, conf.width, &conf);
 339
 340     nestindent = conf.listindentbefore + conf.listindentafter;
 341     nestbase = (conf.indent_preambles ? 0 : -conf.indent);
 342     nesting = nestbase;
 343
 344     /* Do the main document */
 345     for (p = sourceform; p; p = p->next) switch (p->type) {
 346
 347       case para_QuotePush:
 348         nesting += 2;
 349         break;
 350       case para_QuotePop:
 351         nesting -= 2;
 352         assert(nesting >= 0);
 353         break;
 354
 355       case para_LcontPush:
 356         nesting += nestindent;
 357         break;
 358       case para_LcontPop:
 359         nesting -= nestindent;
 360         assert(nesting >= nestbase);
 361         break;
 362
 363         /*
 364          * Things we ignore because we've already processed them or
 365          * aren't going to touch them in this pass.
 366          */
 367       case para_IM:
 368       case para_BR:
 369       case para_Biblio:                /* only touch BiblioCited */
 370       case para_VersionID:
 371       case para_NoCite:
 372       case para_Title:
 373         break;
 374
 375         /*
 376          * Chapter titles.
 377          */
 378       case para_Chapter:
 379       case para_Appendix:
 380       case para_UnnumberedChapter:
 381         text_heading(&tf, p->kwtext, p->kwtext2, p->words,
 382                      conf.achapter, conf.indent, conf.width, &conf);
 383         nesting = 0;
 384         break;
 385
 386       case para_Heading:
 387       case para_Subsect:
 388         text_heading(&tf, p->kwtext, p->kwtext2, p->words,
 389                      conf.asect[p->aux>=conf.nasect ? conf.nasect-1 : p->aux],
 390                      conf.indent, conf.width, &conf);
 391         break;
 392
 393       case para_Rule:
 394         text_rule(&tf, conf.indent + nesting, conf.width - nesting, &conf);
 395         break;
 396
 397       case para_Normal:
 398       case para_Copyright:
 399       case para_DescribedThing:
 400       case para_Description:
 401       case para_BiblioCited:
 402       case para_Bullet:
 403       case para_NumberedList:
 404         if (p->type == para_Bullet) {
 405             prefix = &conf.bullet;
 406             prefixextra = NULL;
 407             indentb = conf.listindentbefore;
 408             indenta = conf.listindentafter;
 409         } else if (p->type == para_NumberedList) {
 410             prefix = p->kwtext;
 411             prefixextra = conf.listsuffix;
 412             indentb = conf.listindentbefore;
 413             indenta = conf.listindentafter;
 414         } else if (p->type == para_Description) {
 415             prefix = NULL;
 416             prefixextra = NULL;
 417             indentb = conf.listindentbefore;
 418             indenta = conf.listindentafter;
 419         } else {
 420             prefix = NULL;
 421             prefixextra = NULL;
 422             indentb = indenta = 0;
 423         }
 424         if (p->type == para_BiblioCited) {
 425             body = dup_word_list(p->kwtext);
 426             for (wp = body; wp->next; wp = wp->next);
 427             wp->next = &spaceword;
 428             spaceword.next = p->words;
 429             spaceword.alt = NULL;
 430             spaceword.type = word_WhiteSpace;
 431             spaceword.text = NULL;
 432         } else {
 433             wp = NULL;
 434             body = p->words;
 435         }
 436         text_para(&tf, prefix, prefixextra, body,
 437                   conf.indent + nesting + indentb, indenta,
 438                   conf.width - nesting - indentb - indenta, &conf);
 439         if (wp) {
 440             wp->next = NULL;
 441             free_word_list(body);
 442         }
 443         break;
 444
 445       case para_Code:
 446         text_codepara(&tf, p->words,
 447                       conf.indent + nesting + conf.indent_code,
 448                       conf.width - nesting - 2 * conf.indent_code);
 449         break;
 450     }
 451
 452     /* Do the version ID */
 453     if (conf.include_version_id) {
 454         for (p = sourceform; p; p = p->next)
 455             if (p->type == para_VersionID)
 456                 text_versionid(&tf, p->words, &conf);
 457     }
 458
 459     /*
 460      * Tidy up
 461      */
 462     text_output(&tf, NULL);            /* end charset conversion */
 463     fclose(tf.fp);
 464     sfree(conf.asect);
 465     sfree(conf.filename);
 466 }
 467
 468 static void text_output(textfile *tf, const wchar_t *s)
 469 {
 470     char buf[256];
 471     int ret, len;
 472     const wchar_t **sp;
 473
 474     if (!s) {
 475         sp = NULL;
 476         len = 1;
 477     } else {
 478         sp = &s;
 479         len = ustrlen(s);
 480     }
 481
 482     while (len > 0) {
 483         ret = charset_from_unicode(sp, &len, buf, lenof(buf),
 484                                    tf->charset, &tf->state, NULL);
 485         if (!sp)
 486             len = 0;
 487         fwrite(buf, 1, ret, tf->fp);
 488     }
 489 }
 490
 491 static void text_output_many(textfile *tf, int n, wchar_t c)
 492 {
 493     wchar_t s[2];
 494     s[0] = c;
 495     s[1] = L'\0';
 496     while (n--)
 497         text_output(tf, s);
 498 }
 499
 500 static void text_rdaddw(rdstring *rs, word *text, word *end, textconfig *cfg) {
 501     for (; text && text != end; text = text->next) switch (text->type) {
 502       case word_HyperLink:
 503       case word_HyperEnd:
 504       case word_UpperXref:
 505       case word_LowerXref:
 506       case word_XrefEnd:
 507       case word_IndexRef:
 508         break;
 509
 510       case word_Normal:
 511       case word_Emph:
 512       case word_Code:
 513       case word_WeakCode:
 514       case word_WhiteSpace:
 515       case word_EmphSpace:
 516       case word_CodeSpace:
 517       case word_WkCodeSpace:
 518       case word_Quote:
 519       case word_EmphQuote:
 520       case word_CodeQuote:
 521       case word_WkCodeQuote:
 522         assert(text->type != word_CodeQuote &&
 523                text->type != word_WkCodeQuote);
 524         if (towordstyle(text->type) == word_Emph &&
 525             (attraux(text->aux) == attr_First ||
 526              attraux(text->aux) == attr_Only))
 527             rdadds(rs, cfg->startemph);
 528         else if (towordstyle(text->type) == word_Code &&
 529                  (attraux(text->aux) == attr_First ||
 530                   attraux(text->aux) == attr_Only))
 531             rdadds(rs, cfg->lquote);
 532         if (removeattr(text->type) == word_Normal) {
 533             if (cvt_ok(cfg->charset, text->text) || !text->alt)
 534                 rdadds(rs, text->text);
 535             else
 536                 text_rdaddw(rs, text->alt, NULL, cfg);
 537         } else if (removeattr(text->type) == word_WhiteSpace) {
 538             rdadd(rs, L' ');
 539         } else if (removeattr(text->type) == word_Quote) {
 540             rdadds(rs, quoteaux(text->aux) == quote_Open ?
 541                    cfg->lquote : cfg->rquote);
 542         }
 543         if (towordstyle(text->type) == word_Emph &&
 544             (attraux(text->aux) == attr_Last ||
 545              attraux(text->aux) == attr_Only))
 546             rdadds(rs, cfg->endemph);
 547         else if (towordstyle(text->type) == word_Code &&
 548                  (attraux(text->aux) == attr_Last ||
 549                   attraux(text->aux) == attr_Only))
 550             rdadds(rs, cfg->rquote);
 551         break;
 552     }
 553 }
 554
 555 static int text_width(void *, word *);
 556
 557 static int text_width_list(void *ctx, word *text) {
 558     int w = 0;
 559     while (text) {
 560         w += text_width(ctx, text);
 561         text = text->next;
 562     }
 563     return w;
 564 }
 565
 566 static int text_width(void *ctx, word *text) {
 567     textconfig *cfg = (textconfig *)ctx;
 568     int wid;
 569     int attr;
 570
 571     switch (text->type) {
 572       case word_HyperLink:
 573       case word_HyperEnd:
 574       case word_UpperXref:
 575       case word_LowerXref:
 576       case word_XrefEnd:
 577       case word_IndexRef:
 578         return 0;
 579     }
 580
 581     assert(text->type < word_internal_endattrs);
 582
 583     wid = 0;
 584     attr = towordstyle(text->type);
 585     if (attr == word_Emph || attr == word_Code) {
 586         if (attraux(text->aux) == attr_Only ||
 587             attraux(text->aux) == attr_First)
 588             wid += ustrwid(attr == word_Emph ? cfg->startemph : cfg->lquote,
 589                            cfg->charset);
 590     }
 591     if (attr == word_Emph || attr == word_Code) {
 592         if (attraux(text->aux) == attr_Only ||
 593             attraux(text->aux) == attr_Last)
 594             wid += ustrwid(attr == word_Emph ? cfg->startemph : cfg->lquote,
 595                            cfg->charset);
 596     }
 597
 598     switch (text->type) {
 599       case word_Normal:
 600       case word_Emph:
 601       case word_Code:
 602       case word_WeakCode:
 603         if (cvt_ok(cfg->charset, text->text) || !text->alt)
 604             wid += ustrwid(text->text, cfg->charset);
 605         else
 606             wid += text_width_list(ctx, text->alt);
 607         return wid;
 608
 609       case word_WhiteSpace:
 610       case word_EmphSpace:
 611       case word_CodeSpace:
 612       case word_WkCodeSpace:
 613       case word_Quote:
 614       case word_EmphQuote:
 615       case word_CodeQuote:
 616       case word_WkCodeQuote:
 617         assert(text->type != word_CodeQuote &&
 618                text->type != word_WkCodeQuote);
 619         if (removeattr(text->type) == word_Quote) {
 620             if (quoteaux(text->aux) == quote_Open)
 621                 wid += ustrwid(cfg->lquote, cfg->charset);
 622             else
 623                 wid += ustrwid(cfg->rquote, cfg->charset);
 624         } else
 625             wid++;                     /* space */
 626     }
 627
 628     return wid;
 629 }
 630
 631 static void text_heading(textfile *tf, word *tprefix, word *nprefix,
 632                          word *text, alignstruct align,
 633                          int indent, int width, textconfig *cfg) {
 634     rdstring t = { 0, 0, NULL };
 635     int margin, length;
 636     int firstlinewidth, wrapwidth;
 637     wrappedline *wrapping, *p;
 638
 639     if (align.number_at_all) {
 640         if (align.just_numbers && nprefix) {
 641             text_rdaddw(&t, nprefix, NULL, cfg);
 642             rdadds(&t, align.number_suffix);
 643         } else if (!align.just_numbers && tprefix) {
 644             text_rdaddw(&t, tprefix, NULL, cfg);
 645             rdadds(&t, align.number_suffix);
 646         }
 647     }
 648     margin = length = ustrwid(t.text ? t.text : L"", cfg->charset);
 649
 650     if (align.align == LEFTPLUS) {
 651         margin = indent - margin;
 652         if (margin < 0) margin = 0;
 653         firstlinewidth = indent + width - margin - length;
 654         wrapwidth = width;
 655     } else if (align.align == LEFT || align.align == CENTRE) {
 656         margin = 0;
 657         firstlinewidth = indent + width - length;
 658         wrapwidth = indent + width;
 659     }
 660
 661     wrapping = wrap_para(text, firstlinewidth, wrapwidth,
 662                          text_width, cfg, 0);
 663     for (p = wrapping; p; p = p->next) {
 664         text_rdaddw(&t, p->begin, p->end, cfg);
 665         length = ustrwid(t.text ? t.text : L"", cfg->charset);
 666         if (align.align == CENTRE) {
 667             margin = (indent + width - length)/2;
 668             if (margin < 0) margin = 0;
 669         }
 670         text_output_many(tf, margin, L' ');
 671         text_output(tf, t.text);
 672         text_output(tf, L"\n");
 673         if (*align.underline) {
 674             text_output_many(tf, margin, L' ');
 675             while (length > 0) {
 676                 text_output(tf, align.underline);
 677                 length -= ustrwid(align.underline, cfg->charset);
 678             }
 679             text_output(tf, L"\n");
 680         }
 681         if (align.align == LEFTPLUS)
 682             margin = indent;
 683         else
 684             margin = 0;
 685         sfree(t.text);
 686         t = empty_rdstring;
 687     }
 688     wrap_free(wrapping);
 689     text_output(tf, L"\n");
 690
 691     sfree(t.text);
 692 }
 693
 694 static void text_rule(textfile *tf, int indent, int width, textconfig *cfg) {
 695     text_output_many(tf, indent, L' ');
 696     while (width > 0) {
 697         text_output(tf, cfg->rule);
 698         width -= ustrwid(cfg->rule, cfg->charset);
 699     }
 700     text_output_many(tf, 2, L'\n');
 701 }
 702
 703 static void text_para(textfile *tf, word *prefix, wchar_t *prefixextra,
 704                       word *text, int indent, int extraindent, int width,
 705                       textconfig *cfg) {
 706     wrappedline *wrapping, *p;
 707     rdstring pfx = { 0, 0, NULL };
 708     int e;
 709     int firstlinewidth = width;
 710
 711     if (prefix) {
 712         text_rdaddw(&pfx, prefix, NULL, cfg);
 713         if (prefixextra)
 714             rdadds(&pfx, prefixextra);
 715         text_output_many(tf, indent, L' ');
 716         text_output(tf, pfx.text);
 717         /* If the prefix is too long, shorten the first line to fit. */
 718         e = extraindent - ustrwid(pfx.text ? pfx.text : L"", cfg->charset);
 719         if (e < 0) {
 720             firstlinewidth += e;       /* this decreases it, since e < 0 */
 721             if (firstlinewidth < 0) {
 722                 e = indent + extraindent;
 723                 firstlinewidth = width;
 724                 text_output(tf, L"\n");
 725             } else
 726                 e = 0;
 727         }
 728         sfree(pfx.text);
 729     } else
 730         e = indent + extraindent;
 731
 732     wrapping = wrap_para(text, firstlinewidth, width,
 733                          text_width, cfg, 0);
 734     for (p = wrapping; p; p = p->next) {
 735         rdstring t = { 0, 0, NULL };
 736         text_rdaddw(&t, p->begin, p->end, cfg);
 737         text_output_many(tf, e, L' ');
 738         text_output(tf, t.text);
 739         text_output(tf, L"\n");
 740         e = indent + extraindent;
 741         sfree(t.text);
 742     }
 743     wrap_free(wrapping);
 744     text_output(tf, L"\n");
 745 }
 746
 747 static void text_codepara(textfile *tf, word *text, int indent, int width) {
 748     for (; text; text = text->next) if (text->type == word_WeakCode) {
 749         int wid = ustrwid(text->text, tf->charset);
 750         if (wid > width)
 751             error(err_text_codeline, &text->fpos, wid, width);
 752         text_output_many(tf, indent, L' ');
 753         text_output(tf, text->text);
 754         text_output(tf, L"\n");
 755     }
 756
 757     text_output(tf, L"\n");
 758 }
 759
 760 static void text_versionid(textfile *tf, word *text, textconfig *cfg) {
 761     rdstring t = { 0, 0, NULL };
 762
 763     rdadd(&t, L'[');
 764     text_rdaddw(&t, text, NULL, cfg);
 765     rdadd(&t, L']');
 766     rdadd(&t, L'\n');
 767
 768     text_output(tf, t.text);
 769     sfree(t.text);
 770 }