X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/halibut/blobdiff_plain/56a99eb648cb255aed42d929823a07913e0d743a..0dfaac7284d7f1a54e957bba4a881d93328c1630:/bk_html.c

diff --git a/bk_html.c b/bk_html.c
index f6091a3..e3202a5 100644
--- a/bk_html.c
+++ b/bk_html.c
@@ -11,27 +11,12 @@
  *    fragment should be used? (Though it should probably still be
  *    _there_ even if unused.)
  * 
- *  - new configurability:
- *     * index_text, contents_text, preamble_text, title_separator,
- * 	 nav_prev_text, nav_next_text, nav_separator,
- * 	 index_main_sep, index_multi_sep, pre_versionid,
- * 	 post_versionid
- *     * Some means of specifying the distinction between
- * 	 restrict-charset and output-charset. It seems to me that
- * 	 `html-charset' is output-charset, and that
- * 	 restrict-charset usually wants to be either output-charset
- * 	 or UTF-8 (the latter indicating that any Unicode character
- * 	 is fair game and it will be specified using &#foo; if it
- * 	 isn't in output-charset). However, since XHTML defaults to
- * 	 UTF-8 and it's fiddly to tell it otherwise, it's just
- * 	 possible that some user may need to set restrict-charset
- * 	 to their charset of choice while leaving _output_-charset
- * 	 at UTF-8. Figure out some configuration, and apply it.
- * 
- *  - nonbreaking spaces.
- * 
- *  - free up all the data we have allocated while running this
- *    backend.
+ *  - In HHK index mode: subsidiary hhk entries (as in replacing
+ *    `foo, bar' with `foo\n\tbar') can be done by embedding
+ *    sub-<UL>s in the hhk file. This requires me getting round to
+ *    supporting that idiom in the rest of Halibut, but I thought
+ *    I'd record how it's done here in case I turn out to have
+ *    forgotten when I get there.
  */
 
 #include <stdio.h>
@@ -52,7 +37,7 @@
 			   (p)->type == para_Title ? -1 : 0 )
 
 typedef struct {
-    int just_numbers;
+    int number_at_all, just_numbers;
     wchar_t *number_suffix;
 } sectlevel;
 
@@ -63,16 +48,20 @@ typedef struct {
     int ncdepths;
     int address_section, visible_version_id;
     int leaf_contains_contents, leaf_smallest_contents;
+    int navlinks;
+    int rellinks;
     char *contents_filename;
     char *index_filename;
     char *template_filename;
     char *single_filename;
-    char *template_fragment;
+    char *chm_filename, *hhp_filename, *hhc_filename, *hhk_filename;
+    char **template_fragments;
+    int ntfragments;
     char *head_end, *body_start, *body_end, *addr_start, *addr_end;
     char *body_tag, *nav_attr;
     wchar_t *author, *description;
     wchar_t *index_text, *contents_text, *preamble_text, *title_separator;
-    wchar_t *nav_prev_text, *nav_next_text, *nav_separator;
+    wchar_t *nav_prev_text, *nav_next_text, *nav_up_text, *nav_separator;
     wchar_t *index_main_sep, *index_multi_sep;
     wchar_t *pre_versionid, *post_versionid;
     int restrict_charset, output_charset;
@@ -98,6 +87,13 @@ struct htmlfile {
     int last_fragment_number;
     int min_heading_depth;
     htmlsect *first, *last;	       /* first/last highest-level sections */
+    /*
+     * The `temp' field is available for use in individual passes
+     * over the file list. For example, the HHK index generation
+     * uses it to ensure no index term references the same file
+     * more than once.
+     */
+    int temp;
 };
 
 struct htmlsect {
@@ -106,13 +102,14 @@ struct htmlsect {
     paragraph *title, *text;
     enum { NORMAL, TOP, INDEX } type;
     int contents_depth;
-    char *fragment;
+    char **fragments;
 };
 
 typedef struct {
     htmlfile *head, *tail;
     htmlfile *single, *index;
     tree234 *frags;
+    tree234 *files;
 } htmlfilelist;
 
 typedef struct {
@@ -142,12 +139,14 @@ typedef struct {
      * level.
      */
     FILE *fp;
-    int charset;
+    int charset, restrict_charset;
     charset_state cstate;
     int ver;
     enum {
 	HO_NEUTRAL, HO_IN_TAG, HO_IN_EMPTY_TAG, HO_IN_TEXT
     } state;
+    int hackflags;		       /* used for icky .HH* stuff */
+    int hacklimit;		       /* text size limit, again for .HH* */
     /*
      * Stuff beyond here deals with the higher syntactic level: it
      * tracks how many levels of <ul> are currently open when
@@ -156,6 +155,21 @@ typedef struct {
     int contents_level;
 } htmloutput;
 
+/*
+ * Nasty hacks that modify the behaviour of htmloutput files. All
+ * of these are flag bits set in ho.hackflags. HO_HACK_QUOTEQUOTES
+ * has the same effect as the `quote_quotes' parameter to
+ * html_text_limit_internal, except that it's set globally on an
+ * entire htmloutput structure; HO_HACK_QUOTENOTHING suppresses
+ * quoting of any HTML special characters (for .HHP files);
+ * HO_HACK_OMITQUOTES completely suppresses the generation of
+ * double quotes at all (turning them into single quotes, for want
+ * of a better idea).
+ */
+#define HO_HACK_QUOTEQUOTES 1
+#define HO_HACK_QUOTENOTHING 2
+#define HO_HACK_OMITQUOTES 4
+
 static int html_fragment_compare(void *av, void *bv)
 {
     htmlfragment *a = (htmlfragment *)av;
@@ -168,11 +182,20 @@ static int html_fragment_compare(void *av, void *bv)
 	return strcmp(a->fragment, b->fragment);
 }
 
+static int html_filename_compare(void *av, void *bv)
+{
+    char *a = (char *)av;
+    char *b = (char *)bv;
+
+    return strcmp(a, b);
+}
+
 static void html_file_section(htmlconfig *cfg, htmlfilelist *files,
 			      htmlsect *sect, int depth);
 
 static htmlfile *html_new_file(htmlfilelist *list, char *filename);
-static htmlsect *html_new_sect(htmlsectlist *list, paragraph *title);
+static htmlsect *html_new_sect(htmlsectlist *list, paragraph *title,
+			       htmlconfig *cfg);
 
 /* Flags for html_words() flags parameter */
 #define NOTHING 0x00
@@ -191,9 +214,10 @@ static void element_attr(htmloutput *ho, char const *name, char const *value);
 static void element_attr_w(htmloutput *ho, char const *name,
 			   wchar_t const *value);
 static void html_text(htmloutput *ho, wchar_t const *str);
+static void html_text_nbsp(htmloutput *ho, wchar_t const *str);
 static void html_text_limit(htmloutput *ho, wchar_t const *str, int maxlen);
 static void html_text_limit_internal(htmloutput *ho, wchar_t const *text,
-				     int maxlen, int quote_quotes);
+				     int maxlen, int quote_quotes, int nbsp);
 static void html_nl(htmloutput *ho);
 static void html_raw(htmloutput *ho, char *text);
 static void html_raw_as_attr(htmloutput *ho, char *text);
@@ -206,6 +230,7 @@ static void html_fragment(htmloutput *ho, char const *fragment);
 static char *html_format(paragraph *p, char *template_string);
 static char *html_sanitise_fragment(htmlfilelist *files, htmlfile *file,
 				    char *text);
+static char *html_sanitise_filename(htmlfilelist *files, char *text);
 
 static void html_contents_entry(htmloutput *ho, int depth, htmlsect *s,
 				htmlfile *thisfile, keywordlist *keywords,
@@ -223,10 +248,12 @@ static htmlconfig html_configure(paragraph *source) {
      */
     ret.leaf_level = 2;
     ret.achapter.just_numbers = FALSE;
+    ret.achapter.number_at_all = TRUE;
     ret.achapter.number_suffix = L": ";
     ret.nasect = 1;
     ret.asect = snewn(ret.nasect, sectlevel);
     ret.asect[0].just_numbers = TRUE;
+    ret.asect[0].number_at_all = TRUE;
     ret.asect[0].number_suffix = L" ";
     ret.ncdepths = 0;
     ret.contents_depths = 0;
@@ -234,15 +261,21 @@ static htmlconfig html_configure(paragraph *source) {
     ret.address_section = TRUE;
     ret.leaf_contains_contents = FALSE;
     ret.leaf_smallest_contents = 4;
+    ret.navlinks = TRUE;
+    ret.rellinks = TRUE;
     ret.single_filename = dupstr("Manual.html");
     ret.contents_filename = dupstr("Contents.html");
     ret.index_filename = dupstr("IndexPage.html");
     ret.template_filename = dupstr("%n.html");
-    ret.template_fragment = dupstr("%b");
+    ret.chm_filename = ret.hhp_filename = NULL;
+    ret.hhc_filename = ret.hhk_filename = NULL;
+    ret.ntfragments = 1;
+    ret.template_fragments = snewn(ret.ntfragments, char *);
+    ret.template_fragments[0] = dupstr("%b");
     ret.head_end = ret.body_tag = ret.body_start = ret.body_end =
 	ret.addr_start = ret.addr_end = ret.nav_attr = NULL;
     ret.author = ret.description = NULL;
-    ret.restrict_charset = CS_ASCII;
+    ret.restrict_charset = CS_UTF8;
     ret.output_charset = CS_ASCII;
     ret.htmlver = HTML_4;
     ret.index_text = L"Index";
@@ -251,6 +284,7 @@ static htmlconfig html_configure(paragraph *source) {
     ret.title_separator = L" - ";
     ret.nav_prev_text = L"Previous";
     ret.nav_next_text = L"Next";
+    ret.nav_up_text = L"Up";
     ret.nav_separator = L" | ";
     ret.index_main_sep = L": ";
     ret.index_multi_sep = L", ";
@@ -276,6 +310,10 @@ static htmlconfig html_configure(paragraph *source) {
 		    ret.lquote = uadv(p->keyword);
 		    ret.rquote = uadv(ret.lquote);
 		}
+	    } else if (!ustricmp(p->keyword, L"index")) {
+		ret.index_text = uadv(p->keyword);
+	    } else if (!ustricmp(p->keyword, L"contents")) {
+		ret.contents_text = uadv(p->keyword);
 	    }
 	}
     }
@@ -287,11 +325,10 @@ static htmlconfig html_configure(paragraph *source) {
 	    if (!ustrnicmp(k, L"xhtml-", 6))
 		k++;		    /* treat `xhtml-' and `html-' the same */
 
-	    if (!ustricmp(k, L"html-charset")) {
-		char *csname = utoa_dup(uadv(k), CS_ASCII);
-		ret.restrict_charset = ret.output_charset =
-		    charset_from_localenc(csname);
-		sfree(csname);
+	    if (!ustricmp(k, L"html-restrict-charset")) {
+		ret.restrict_charset = charset_from_ustr(&p->fpos, uadv(k));
+	    } else if (!ustricmp(k, L"html-output-charset")) {
+		ret.output_charset = charset_from_ustr(&p->fpos, uadv(k));
 	    } else if (!ustricmp(k, L"html-version")) {
 		wchar_t *vername = uadv(k);
 		static const struct {
@@ -327,14 +364,42 @@ static htmlconfig html_configure(paragraph *source) {
 		sfree(ret.template_filename);
 		ret.template_filename = dupstr(adv(p->origkeyword));
 	    } else if (!ustricmp(k, L"html-template-fragment")) {
-		sfree(ret.template_fragment);
-		ret.template_fragment = dupstr(adv(p->origkeyword));
+		char *frag = adv(p->origkeyword);
+		if (*frag) {
+		    while (ret.ntfragments--)
+			sfree(ret.template_fragments[ret.ntfragments]);
+		    sfree(ret.template_fragments);
+		    ret.template_fragments = NULL;
+		    ret.ntfragments = 0;
+		    while (*frag) {
+			ret.ntfragments++;
+			ret.template_fragments =
+			    sresize(ret.template_fragments,
+				    ret.ntfragments, char *);
+			ret.template_fragments[ret.ntfragments-1] =
+			    dupstr(frag);
+			frag = adv(frag);
+		    }
+		} else
+		    error(err_cfginsufarg, &p->fpos, p->origkeyword, 1);
 	    } else if (!ustricmp(k, L"html-chapter-numeric")) {
 		ret.achapter.just_numbers = utob(uadv(k));
+	    } else if (!ustricmp(k, L"html-chapter-shownumber")) {
+		ret.achapter.number_at_all = utob(uadv(k));
+	    } else if (!ustricmp(k, L"html-suppress-navlinks")) {
+		ret.navlinks = !utob(uadv(k));
+	    } else if (!ustricmp(k, L"html-rellinks")) {
+		ret.rellinks = utob(uadv(k));
 	    } else if (!ustricmp(k, L"html-chapter-suffix")) {
 		ret.achapter.number_suffix = uadv(k);
 	    } else if (!ustricmp(k, L"html-leaf-level")) {
-		ret.leaf_level = utoi(uadv(k));
+		wchar_t *u = uadv(k);
+		if (!ustricmp(u, L"infinite") ||
+		    !ustricmp(u, L"infinity") ||
+		    !ustricmp(u, L"inf"))
+		    ret.leaf_level = -1;   /* represents infinity */
+		else
+		    ret.leaf_level = utoi(u);
 	    } else if (!ustricmp(k, L"html-section-numeric")) {
 		wchar_t *q = uadv(k);
 		int n = 0;
@@ -350,6 +415,21 @@ static htmlconfig html_configure(paragraph *source) {
 		    ret.nasect = n+1;
 		}
 		ret.asect[n].just_numbers = utob(q);
+	    } else if (!ustricmp(k, L"html-section-shownumber")) {
+		wchar_t *q = uadv(k);
+		int n = 0;
+		if (uisdigit(*q)) {
+		    n = utoi(q);
+		    q = uadv(q);
+		}
+		if (n >= ret.nasect) {
+		    int i;
+		    ret.asect = sresize(ret.asect, n+1, sectlevel);
+		    for (i = ret.nasect; i <= n; i++)
+			ret.asect[i] = ret.asect[ret.nasect-1];
+		    ret.nasect = n+1;
+		}
+		ret.asect[n].number_at_all = utob(q);
 	    } else if (!ustricmp(k, L"html-section-suffix")) {
 		wchar_t *q = uadv(k);
 		int n = 0;
@@ -422,11 +502,66 @@ static htmlconfig html_configure(paragraph *source) {
 		ret.leaf_contains_contents = utob(uadv(k));
 	    } else if (!ustricmp(k, L"html-leaf-smallest-contents")) {
 		ret.leaf_smallest_contents = utoi(uadv(k));
+	    } else if (!ustricmp(k, L"html-index-text")) {
+		ret.index_text = uadv(k);
+	    } else if (!ustricmp(k, L"html-contents-text")) {
+		ret.contents_text = uadv(k);
+	    } else if (!ustricmp(k, L"html-preamble-text")) {
+		ret.preamble_text = uadv(k);
+	    } else if (!ustricmp(k, L"html-title-separator")) {
+		ret.title_separator = uadv(k);
+	    } else if (!ustricmp(k, L"html-nav-prev-text")) {
+		ret.nav_prev_text = uadv(k);
+	    } else if (!ustricmp(k, L"html-nav-next-text")) {
+		ret.nav_next_text = uadv(k);
+	    } else if (!ustricmp(k, L"html-nav-up-text")) {
+		ret.nav_up_text = uadv(k);
+	    } else if (!ustricmp(k, L"html-nav-separator")) {
+		ret.nav_separator = uadv(k);
+	    } else if (!ustricmp(k, L"html-index-main-separator")) {
+		ret.index_main_sep = uadv(k);
+	    } else if (!ustricmp(k, L"html-index-multiple-separator")) {
+		ret.index_multi_sep = uadv(k);
+	    } else if (!ustricmp(k, L"html-pre-versionid")) {
+		ret.pre_versionid = uadv(k);
+	    } else if (!ustricmp(k, L"html-post-versionid")) {
+		ret.post_versionid = uadv(k);
+	    } else if (!ustricmp(k, L"html-mshtmlhelp-chm")) {
+		sfree(ret.chm_filename);
+		ret.chm_filename = dupstr(adv(p->origkeyword));
+	    } else if (!ustricmp(k, L"html-mshtmlhelp-project")) {
+		sfree(ret.hhp_filename);
+		ret.hhp_filename = dupstr(adv(p->origkeyword));
+	    } else if (!ustricmp(k, L"html-mshtmlhelp-contents")) {
+		sfree(ret.hhc_filename);
+		ret.hhc_filename = dupstr(adv(p->origkeyword));
+	    } else if (!ustricmp(k, L"html-mshtmlhelp-index")) {
+		sfree(ret.hhk_filename);
+		ret.hhk_filename = dupstr(adv(p->origkeyword));
 	    }
 	}
     }
 
     /*
+     * Enforce that the CHM and HHP filenames must either be both
+     * present or both absent. If one is present but not the other,
+     * turn both off.
+     */
+    if (!ret.chm_filename ^ !ret.hhp_filename) {
+	error(err_chmnames);
+	sfree(ret.chm_filename); ret.chm_filename = NULL;
+	sfree(ret.hhp_filename); ret.hhp_filename = NULL;
+    }
+    /*
+     * And if we're not generating an HHP, there's no need for HHC
+     * or HHK.
+     */
+    if (!ret.hhp_filename) {
+	sfree(ret.hhc_filename); ret.hhc_filename = NULL;
+	sfree(ret.hhk_filename); ret.hhk_filename = NULL;
+    }
+
+    /*
      * Now process fallbacks on quote characters.
      */
     while (*uadv(ret.rquote) && *uadv(uadv(ret.rquote)) &&
@@ -458,11 +593,15 @@ paragraph *html_config_filename(char *filename)
 }
 
 void html_backend(paragraph *sourceform, keywordlist *keywords,
-		  indexdata *idx, void *unused) {
+		  indexdata *idx, void *unused)
+{
     paragraph *p;
+    htmlsect *topsect;
     htmlconfig conf;
-    htmlfilelist files = { NULL, NULL, NULL, NULL, NULL };
+    htmlfilelist files = { NULL, NULL, NULL, NULL, NULL, NULL };
     htmlsectlist sects = { NULL, NULL }, nonsects = { NULL, NULL };
+    char *hhk_filename;
+    int has_index;
 
     IGNORE(unused);
 
@@ -478,6 +617,7 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 	p->private_data = NULL;
 
     files.frags = newtree234(html_fragment_compare);
+    files.files = newtree234(html_filename_compare);
 
     /*
      * Start by figuring out into which file each piece of the
@@ -488,20 +628,19 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
      * source form but needs to be consistently mentioned in
      * contents links.
      * 
-     * While we're here, we'll also invent the HTML fragment name
+     * While we're here, we'll also invent the HTML fragment name(s)
      * for each section.
      */
     {
-	htmlsect *topsect, *sect;
+	htmlsect *sect;
 	int d;
 
-	topsect = html_new_sect(&sects, NULL);
+	topsect = html_new_sect(&sects, NULL, &conf);
 	topsect->type = TOP;
 	topsect->title = NULL;
 	topsect->text = sourceform;
 	topsect->contents_depth = contents_depth(conf, 0);
 	html_file_section(&conf, &files, topsect, -1);
-	topsect->fragment = NULL;
 
 	for (p = sourceform; p; p = p->next)
 	    if (is_heading_type(p->type)) {
@@ -512,7 +651,7 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 		    continue;
 		}
 
-		sect = html_new_sect(&sects, p);
+		sect = html_new_sect(&sects, p, &conf);
 		sect->text = p->next;
 
 		sect->contents_depth = contents_depth(conf, d+1) - (d+1);
@@ -526,21 +665,36 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 
 		html_file_section(&conf, &files, sect, d);
 
-		sect->fragment = html_format(p, conf.template_fragment);
-		sect->fragment = html_sanitise_fragment(&files, sect->file,
-							sect->fragment);
+		{
+		    int i;
+		    for (i=0; i < conf.ntfragments; i++) {
+			sect->fragments[i] =
+			    html_format(p, conf.template_fragments[i]);
+			sect->fragments[i] =
+			    html_sanitise_fragment(&files, sect->file,
+						   sect->fragments[i]);
+		    }
+		}
 	    }
 
-	/* And the index. */
-	sect = html_new_sect(&sects, NULL);
-	sect->text = NULL;
-	sect->type = INDEX;
-	sect->parent = topsect;
-	html_file_section(&conf, &files, sect, 0);   /* peer of chapters */
-	sect->fragment = utoa_dup(conf.index_text, CS_ASCII);
-	sect->fragment = html_sanitise_fragment(&files, sect->file,
-						sect->fragment);
-	files.index = sect->file;
+	/*
+	 * And the index, if we have one. Note that we don't output
+	 * an index as an HTML file if we're outputting one as a
+	 * .HHK.
+	 */
+	has_index = (count234(idx->entries) > 0);
+	if (has_index && !conf.hhk_filename) {
+	    sect = html_new_sect(&sects, NULL, &conf);
+	    sect->text = NULL;
+	    sect->type = INDEX;
+	    sect->parent = topsect;
+            sect->contents_depth = 0;
+	    html_file_section(&conf, &files, sect, 0);   /* peer of chapters */
+	    sect->fragments[0] = utoa_dup(conf.index_text, CS_ASCII);
+	    sect->fragments[0] = html_sanitise_fragment(&files, sect->file,
+							sect->fragments[0]);
+	    files.index = sect->file;
+	}
     }
 
     /*
@@ -585,7 +739,7 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 		 * won't attempt to add it to the contents or
 		 * anything weird like that).
 		 */
-		sect = html_new_sect(&nonsects, p);
+		sect = html_new_sect(&nonsects, p, &conf);
 		sect->file = parent->file;
 		sect->parent = parent;
 		p->private_data = sect;
@@ -594,11 +748,11 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 		 * Fragment IDs for these paragraphs will simply be
 		 * `p' followed by an integer.
 		 */
-		sect->fragment = snewn(40, char);
-		sprintf(sect->fragment, "p%d",
+		sect->fragments[0] = snewn(40, char);
+		sprintf(sect->fragments[0], "p%d",
 			sect->file->last_fragment_number++);
-		sect->fragment = html_sanitise_fragment(&files, sect->file,
-							sect->fragment);
+		sect->fragments[0] = html_sanitise_fragment(&files, sect->file,
+							    sect->fragments[0]);
 	    }
 	}
     }
@@ -730,41 +884,57 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 #define listname(lt) ( (lt)==UL ? "ul" : (lt)==OL ? "ol" : "dl" )
 #define itemname(lt) ( (lt)==LI ? "li" : (lt)==DT ? "dt" : "dd" )
 
-	    ho.fp = fopen(f->filename, "w");
+	    if (!strcmp(f->filename, "-"))
+		ho.fp = stdout;
+	    else
+		ho.fp = fopen(f->filename, "w");
+	    if (!ho.fp)
+		error(err_cantopenw, f->filename);
+
 	    ho.charset = conf.output_charset;
+	    ho.restrict_charset = conf.restrict_charset;
 	    ho.cstate = charset_init_state;
 	    ho.ver = conf.htmlver;
 	    ho.state = HO_NEUTRAL;
 	    ho.contents_level = 0;
+	    ho.hackflags = 0;	       /* none of these thankyouverymuch */
+	    ho.hacklimit = -1;
 
 	    /* <!DOCTYPE>. */
 	    switch (conf.htmlver) {
 	      case HTML_3_2:
-		fprintf(ho.fp, "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD "
-			"HTML 3.2 Final//EN\">\n");
+		if (ho.fp)
+		    fprintf(ho.fp, "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD "
+			    "HTML 3.2 Final//EN\">\n");
 		break;
 	      case HTML_4:
-		fprintf(ho.fp, "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML"
-			" 4.01//EN\"\n\"http://www.w3.org/TR/html4/"
-			"strict.dtd\">\n");
+		if (ho.fp)
+		    fprintf(ho.fp, "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML"
+			    " 4.01//EN\"\n\"http://www.w3.org/TR/html4/"
+			    "strict.dtd\">\n");
 		break;
 	      case ISO_HTML:
-		fprintf(ho.fp, "<!DOCTYPE HTML PUBLIC \"ISO/IEC "
-			"15445:2000//DTD HTML//EN\">\n");
+		if (ho.fp)
+		    fprintf(ho.fp, "<!DOCTYPE HTML PUBLIC \"ISO/IEC "
+			    "15445:2000//DTD HTML//EN\">\n");
 		break;
 	      case XHTML_1_0_TRANSITIONAL:
-		fprintf(ho.fp, "<?xml version=\"1.0\" encoding=\"%s\"?>\n",
-			charset_to_mimeenc(conf.output_charset));
-		fprintf(ho.fp, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML"
-			" 1.0 Transitional//EN\"\n\"http://www.w3.org/TR/"
-			"xhtml1/DTD/xhtml1-transitional.dtd\">\n");
+		if (ho.fp) {
+		    fprintf(ho.fp, "<?xml version=\"1.0\" encoding=\"%s\"?>\n",
+			    charset_to_mimeenc(conf.output_charset));
+		    fprintf(ho.fp, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML"
+			    " 1.0 Transitional//EN\"\n\"http://www.w3.org/TR/"
+			    "xhtml1/DTD/xhtml1-transitional.dtd\">\n");
+		}
 		break;
 	      case XHTML_1_0_STRICT:
-		fprintf(ho.fp, "<?xml version=\"1.0\" encoding=\"%s\"?>\n",
-			charset_to_mimeenc(conf.output_charset));
-		fprintf(ho.fp, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML"
-			" 1.0 Strict//EN\"\n\"http://www.w3.org/TR/xhtml1/"
-			"DTD/xhtml1-strict.dtd\">\n");
+		if (ho.fp) {
+		    fprintf(ho.fp, "<?xml version=\"1.0\" encoding=\"%s\"?>\n",
+			    charset_to_mimeenc(conf.output_charset));
+		    fprintf(ho.fp, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML"
+			    " 1.0 Strict//EN\"\n\"http://www.w3.org/TR/xhtml1/"
+			    "DTD/xhtml1-strict.dtd\">\n");
+		}
 		break;
 	    }
 
@@ -816,9 +986,72 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 	    element_close(&ho, "title");
 	    html_nl(&ho);
 
+	    if (conf.rellinks) {
+
+		if (prevf) {
+		    element_empty(&ho, "link");
+		    element_attr(&ho, "rel", "previous");
+		    element_attr(&ho, "href", prevf->filename);
+		    html_nl(&ho);
+		}
+
+		if (f != files.head) {
+		    element_empty(&ho, "link");
+		    element_attr(&ho, "rel", "ToC");
+		    element_attr(&ho, "href", files.head->filename);
+		    html_nl(&ho);
+		}
+
+		if (conf.leaf_level > 0) {
+		    htmlsect *p = f->first->parent;
+		    assert(p == f->last->parent);
+		    if (p) {
+			element_empty(&ho, "link");
+			element_attr(&ho, "rel", "up");
+			element_attr(&ho, "href", p->file->filename);
+			html_nl(&ho);
+		    }
+		}
+
+		if (has_index && files.index && f != files.index) {
+		    element_empty(&ho, "link");
+		    element_attr(&ho, "rel", "index");
+		    element_attr(&ho, "href", files.index->filename);
+		    html_nl(&ho);
+		}
+
+		if (f->next) {
+		    element_empty(&ho, "link");
+		    element_attr(&ho, "rel", "next");
+		    element_attr(&ho, "href", f->next->filename);
+		    html_nl(&ho);
+		}
+
+	    }
+
 	    if (conf.head_end)
 		html_raw(&ho, conf.head_end);
 
+	    /*
+	     * Add any <head> data defined in specific sections
+	     * that go in this file. (This is mostly to allow <meta
+	     * name="AppleTitle"> tags for Mac online help.)
+	     */
+	    for (s = sects.head; s; s = s->next) {
+		if (s->file == f && s->text) {
+		    for (p = s->text;
+			 p && (p == s->text || p->type == para_Title ||
+			       !is_heading_type(p->type));
+			 p = p->next) {
+			if (p->type == para_Config) {
+			    if (!ustricmp(p->keyword, L"html-local-head")) {
+				html_raw(&ho, adv(p->origkeyword));
+			    }
+			}
+		    }
+		}
+	    }
+
 	    element_close(&ho, "head");
 	    html_nl(&ho);
 
@@ -835,7 +1068,7 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 	     * Write out a nav bar. Special case: we don't do this
 	     * if there is only one file.
 	     */
-	    if (files.head != files.tail) {
+	    if (conf.navlinks && files.head != files.tail) {
 		element_open(&ho, "p");
 		if (conf.nav_attr)
 		    html_raw_as_attr(&ho, conf.nav_attr);
@@ -858,15 +1091,32 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 		if (f != files.head)
 		    element_close(&ho, "a");
 
-		html_text(&ho, conf.nav_separator);
+		/* We don't bother with "Up" links for leaf-level 1,
+		 * as they would be identical to the "Contents" links. */
+		if (conf.leaf_level >= 2) {
+		    htmlsect *p = f->first->parent;
+		    assert(p == f->last->parent);
+		    html_text(&ho, conf.nav_separator);
+		    if (p) {
+			element_open(&ho, "a");
+			element_attr(&ho, "href", p->file->filename);
+		    }
+		    html_text(&ho, conf.nav_up_text);
+		    if (p) {
+			element_close(&ho, "a");
+		    }
+		}
 
-		if (f != files.index) {
-		    element_open(&ho, "a");
-		    element_attr(&ho, "href", files.index->filename);
+		if (has_index && files.index) {
+		    html_text(&ho, conf.nav_separator);
+		    if (f != files.index) {
+			element_open(&ho, "a");
+			element_attr(&ho, "href", files.index->filename);
+		    }
+		    html_text(&ho, conf.index_text);
+		    if (f != files.index)
+			element_close(&ho, "a");
 		}
-		html_text(&ho, conf.index_text);
-		if (f != files.index)
-		    element_close(&ho, "a");
 
 		html_text(&ho, conf.nav_separator);
 
@@ -884,7 +1134,7 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 	    prevf = f;
 
 	    /*
-	     * Write out a prefix TOC for the file.
+	     * Write out a prefix TOC for the file (if a leaf file).
 	     * 
 	     * We start by going through the section list and
 	     * collecting the sections which need to be added to
@@ -967,6 +1217,12 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 		     */
 		    displaying = TRUE;
 		} else {
+		    /*
+		     * Doesn't belong in this file, but it may be
+		     * a descendant of a section which does, in
+		     * which case we should consider it for the
+		     * main TOC of this file (for non-leaf files).
+		     */
 		    htmlsect *a, *ac;
 		    int depth, adepth;
 
@@ -1026,14 +1282,18 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 		    element_open(&ho, htag);
 
 		    /*
-		     * Provide anchor for cross-links to target.
+		     * Provide anchor(s) for cross-links to target.
 		     * 
 		     * (Also we'll have to do this separately in
 		     * other paragraph types - NumberedList and
 		     * BiblioCited.)
 		     */
-		    if (s->fragment)
-			html_fragment(&ho, s->fragment);
+		    {
+			int i;
+			for (i=0; i < conf.ntfragments; i++)
+			    if (s->fragments[i])
+				html_fragment(&ho, s->fragments[i]);
+		    }
 
 		    html_section_title(&ho, s, f, keywords, &conf, TRUE);
 
@@ -1165,7 +1425,10 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 				element_open(&ho, "p");
 				if (p->private_data) {
 				    htmlsect *s = (htmlsect *)p->private_data;
-				    html_fragment(&ho, s->fragment);
+				    int i;
+				    for (i=0; i < conf.ntfragments; i++)
+					if (s->fragments[i])
+					    html_fragment(&ho, s->fragments[i]);
 				}
 				html_nl(&ho);
 				html_words(&ho, p->kwtext, ALL,
@@ -1181,7 +1444,10 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 				element_open(&ho, "li");
 				if (p->private_data) {
 				    htmlsect *s = (htmlsect *)p->private_data;
-				    html_fragment(&ho, s->fragment);
+				    int i;
+				    for (i=0; i < conf.ntfragments; i++)
+					if (s->fragments[i])
+					    html_fragment(&ho, s->fragments[i]);
 				}
 				html_nl(&ho);
 				stackhead->itemtype = LI;
@@ -1295,7 +1561,8 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
 		 */
 		int done_version_ids = FALSE;
 
-		element_empty(&ho, "hr");
+		if (conf.address_section)
+		    element_empty(&ho, "hr");
 
 		if (conf.body_end)
 		    html_raw(&ho, conf.body_end);
@@ -1376,6 +1643,309 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
     }
 
     /*
+     * Before we start outputting the HTML Help files, check
+     * whether there's even going to _be_ an index file: we omit it
+     * if the index contains nothing.
+     */
+    hhk_filename = conf.hhk_filename;
+    if (hhk_filename) {
+	int ok = FALSE;
+	int i;
+	indexentry *entry;
+
+	for (i = 0; (entry = index234(idx->entries, i)) != NULL; i++) {
+	    htmlindex *hi = (htmlindex *)entry->backend_data;
+
+	    if (hi->nrefs > 0) {
+		ok = TRUE;	       /* found an index entry */
+		break;
+	    }
+	}
+
+	if (!ok)
+	    hhk_filename = NULL;
+    }
+
+    /*
+     * Output the MS HTML Help supporting files, if requested.
+     *
+     * A good unofficial reference for these is <http://chmspec.nongnu.org/>.
+     */
+    if (conf.hhp_filename) {
+	htmlfile *f;
+	htmloutput ho;
+
+	ho.charset = CS_CP1252;	       /* as far as I know, HHP files are */
+	ho.restrict_charset = CS_CP1252;   /* hardwired to this charset */
+	ho.cstate = charset_init_state;
+	ho.ver = HTML_4;	       /* *shrug* */
+	ho.state = HO_NEUTRAL;
+	ho.contents_level = 0;
+	ho.hackflags = HO_HACK_QUOTENOTHING;
+
+	ho.fp = fopen(conf.hhp_filename, "w");
+	if (!ho.fp)
+	    error(err_cantopenw, conf.hhp_filename);
+
+	fprintf(ho.fp,
+		"[OPTIONS]\n"
+		/* Binary TOC required for Next/Previous nav to work */
+		"Binary TOC=Yes\n"
+		"Compatibility=1.1 or later\n"
+		"Compiled file=%s\n"
+		"Default Window=main\n"
+		"Default topic=%s\n"
+		"Display compile progress=Yes\n"
+		"Full-text search=Yes\n"
+		"Title=", conf.chm_filename, files.head->filename);
+
+	ho.hacklimit = 255;
+	html_words(&ho, topsect->title->words, NOTHING,
+		   NULL, keywords, &conf);
+
+	fprintf(ho.fp, "\n");
+
+	/*
+	 * These two entries don't seem to be remotely necessary
+	 * for a successful run of the help _compiler_, but
+	 * omitting them causes the GUI Help Workshop to behave
+	 * rather strangely if you try to load the help project
+	 * into that and edit it.
+	 */
+	if (conf.hhc_filename)
+	    fprintf(ho.fp, "Contents file=%s\n", conf.hhc_filename);
+	if (hhk_filename)
+	    fprintf(ho.fp, "Index file=%s\n", hhk_filename);
+
+	fprintf(ho.fp, "\n[WINDOWS]\nmain=\"");
+
+	ho.hackflags |= HO_HACK_OMITQUOTES;
+	ho.hacklimit = 255;
+	html_words(&ho, topsect->title->words, NOTHING,
+		   NULL, keywords, &conf);
+
+	fprintf(ho.fp, "\",\"%s\",\"%s\",\"%s\",,,,,,"
+		/* This first magic number is fsWinProperties, controlling
+		 * Navigation Pane options and the like.
+		 * Constants HHWIN_PROP_* in htmlhelp.h. */
+		"0x62520,,"
+		/* This second number is fsToolBarFlags, mainly controlling
+		 * toolbar buttons. Constants HHWIN_BUTTON_*.
+		 * NOTE: there are two pairs of bits for Next/Previous
+		 * buttons: 7/8 (which do nothing useful), and 21/22
+		 * (which work). (Neither of these are exposed in the HHW
+		 * UI, but they work fine in HH.) We use the latter. */
+		"0x60304e,,,,,,,,0\n",
+		conf.hhc_filename ? conf.hhc_filename : "",
+		hhk_filename ? hhk_filename : "",
+		files.head->filename);
+
+	/*
+	 * The [FILES] section is also not necessary for
+	 * compilation (hhc appears to build up a list of needed
+	 * files just by following links from the given starting
+	 * points), but useful for loading the project into HHW.
+	 */
+	fprintf(ho.fp, "\n[FILES]\n");
+	for (f = files.head; f; f = f->next)
+	    fprintf(ho.fp, "%s\n", f->filename);
+
+	fclose(ho.fp);
+    }
+    if (conf.hhc_filename) {
+	htmlfile *f;
+	htmlsect *s, *a;
+	htmloutput ho;
+	int currdepth = 0;
+
+	ho.fp = fopen(conf.hhc_filename, "w");
+	if (!ho.fp)
+	    error(err_cantopenw, conf.hhc_filename);
+
+	ho.charset = CS_CP1252;	       /* as far as I know, HHC files are */
+	ho.restrict_charset = CS_CP1252;   /* hardwired to this charset */
+	ho.cstate = charset_init_state;
+	ho.ver = HTML_4;	       /* *shrug* */
+	ho.state = HO_NEUTRAL;
+	ho.contents_level = 0;
+	ho.hackflags = HO_HACK_QUOTEQUOTES;
+
+	/*
+	 * Magic DOCTYPE which seems to work for .HHC files. I'm
+	 * wary of trying to change it!
+	 */
+	fprintf(ho.fp, "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML//EN\">\n"
+		"<HTML><HEAD>\n"
+		"<META HTTP-EQUIV=\"Content-Type\" "
+		"CONTENT=\"text/html; charset=%s\">\n"
+		"</HEAD><BODY><UL>\n",
+		charset_to_mimeenc(conf.output_charset));
+
+	for (f = files.head; f; f = f->next) {
+	    /*
+	     * For each HTML file, write out a contents entry.
+	     */
+	    int depth, leaf = TRUE;
+
+	    /*
+	     * Determine the depth of this file in the contents
+	     * tree.
+	     * 
+	     * If the file contains no sections, it is assumed to
+	     * have depth zero.
+	     */
+	    depth = 0;
+	    if (f->first)
+		for (a = f->first->parent; a && a->type != TOP; a = a->parent)
+		    depth++;
+
+	    /*
+	     * Determine if this file is a leaf file, by
+	     * trawling the section list to see if there's any
+	     * section with an ancestor in this file but which
+	     * is not itself in this file.
+	     *
+	     * Special case: for contents purposes, the TOP
+	     * file is not considered to be the parent of the
+	     * chapter files, so it's always a leaf.
+	     * 
+	     * A file with no sections in it is also a leaf.
+	     */
+	    if (f->first && f->first->type != TOP) {
+		for (s = f->first; s; s = s->next) {
+		    htmlsect *a;
+
+		    if (leaf && s->file != f) {
+			for (a = s; a; a = a->parent)
+			    if (a->file == f) {
+				leaf = FALSE;
+				break;
+			    }
+		    }
+		}
+	    }
+
+	    /*
+	     * Now write out our contents entry.
+	     */
+	    while (currdepth < depth) {
+		fprintf(ho.fp, "<UL>\n");
+		currdepth++;
+	    }
+	    while (currdepth > depth) {
+		fprintf(ho.fp, "</UL>\n");
+		currdepth--;
+	    }
+	    /* fprintf(ho.fp, "<!-- depth=%d -->", depth); */
+	    fprintf(ho.fp, "<LI><OBJECT TYPE=\"text/sitemap\">"
+		    "<PARAM NAME=\"Name\" VALUE=\"");
+	    ho.hacklimit = 255;
+	    if (f->first->title)
+		html_words(&ho, f->first->title->words, NOTHING,
+			   NULL, keywords, &conf);
+	    else if (f->first->type == INDEX)
+		html_text(&ho, conf.index_text);
+	    fprintf(ho.fp, "\"><PARAM NAME=\"Local\" VALUE=\"%s\">"
+		    "<PARAM NAME=\"ImageNumber\" VALUE=\"%d\"></OBJECT>\n",
+		    f->filename, leaf ? 11 : 1);
+	}
+
+	while (currdepth > 0) {
+	    fprintf(ho.fp, "</UL>\n");
+	    currdepth--;
+	}
+
+	fprintf(ho.fp, "</UL></BODY></HTML>\n");
+
+	cleanup(&ho);
+    }
+    if (hhk_filename) {
+	htmlfile *f;
+	htmloutput ho;
+	indexentry *entry;
+	int i;
+
+	/*
+	 * First make a pass over all HTML files and set their
+	 * `temp' fields to zero, because we're about to use them.
+	 */
+	for (f = files.head; f; f = f->next)
+	    f->temp = 0;
+
+	ho.fp = fopen(hhk_filename, "w");
+	if (!ho.fp)
+	    error(err_cantopenw, hhk_filename);
+
+	ho.charset = CS_CP1252;	       /* as far as I know, HHK files are */
+	ho.restrict_charset = CS_CP1252;   /* hardwired to this charset */
+	ho.cstate = charset_init_state;
+	ho.ver = HTML_4;	       /* *shrug* */
+	ho.state = HO_NEUTRAL;
+	ho.contents_level = 0;
+	ho.hackflags = HO_HACK_QUOTEQUOTES;
+
+	/*
+	 * Magic DOCTYPE which seems to work for .HHK files. I'm
+	 * wary of trying to change it!
+	 */
+	fprintf(ho.fp, "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML//EN\">\n"
+		"<HTML><HEAD>\n"
+		"<META HTTP-EQUIV=\"Content-Type\" "
+		"CONTENT=\"text/html; charset=%s\">\n"
+		"</HEAD><BODY><UL>\n",
+		charset_to_mimeenc(conf.output_charset));
+
+	/*
+	 * Go through the index terms and output each one.
+	 */
+	for (i = 0; (entry = index234(idx->entries, i)) != NULL; i++) {
+	    htmlindex *hi = (htmlindex *)entry->backend_data;
+	    int j;
+
+	    if (hi->nrefs > 0) {
+		fprintf(ho.fp, "<LI><OBJECT TYPE=\"text/sitemap\">\n"
+			"<PARAM NAME=\"Name\" VALUE=\"");
+		ho.hacklimit = 255;
+		html_words(&ho, entry->text, NOTHING,
+			   NULL, keywords, &conf);
+		fprintf(ho.fp, "\">\n");
+
+		for (j = 0; j < hi->nrefs; j++) {
+		    htmlindexref *hr =
+			(htmlindexref *)hi->refs[j]->private_data;
+
+		    /*
+		     * Use the temp field to ensure we don't
+		     * reference the same file more than once.
+		     */
+		    if (!hr->section->file->temp) {
+			fprintf(ho.fp, "<PARAM NAME=\"Local\" VALUE=\"%s\">\n",
+				hr->section->file->filename);
+			hr->section->file->temp = 1;
+		    }
+
+		    hr->referenced = TRUE;
+		}
+
+		fprintf(ho.fp, "</OBJECT>\n");
+
+		/*
+		 * Now go through those files and re-clear the temp
+		 * fields ready for the _next_ index term.
+		 */
+		for (j = 0; j < hi->nrefs; j++) {
+		    htmlindexref *hr =
+			(htmlindexref *)hi->refs[j]->private_data;
+		    hr->section->file->temp = 0;
+		}
+	    }
+	}
+
+	fprintf(ho.fp, "</UL></BODY></HTML>\n");
+	cleanup(&ho);
+    }
+
+    /*
      * Go through and check that no index fragments were referenced
      * without being generated, or indeed vice versa.
      * 
@@ -1393,8 +1963,86 @@ void html_backend(paragraph *sourceform, keywordlist *keywords,
     }
 
     /*
-     * FIXME: Free all the working data.
+     * Free all the working data.
+     */
+    {
+	htmlfragment *frag;
+	while ( (frag = (htmlfragment *)delpos234(files.frags, 0)) != NULL ) {
+	    /*
+	     * frag->fragment is dynamically allocated, but will be
+	     * freed when we process the htmlsect structure which
+	     * it is attached to.
+	     */
+	    sfree(frag);
+	}
+	freetree234(files.frags);
+    }
+    /*
+     * The strings in files.files are all owned by their containing
+     * htmlfile structures, so there's no need to free them here.
      */
+    freetree234(files.files);
+    {
+	htmlsect *sect, *tmp;
+	sect = sects.head;
+	while (sect) {
+	    int i;
+	    tmp = sect->next;
+	    for (i=0; i < conf.ntfragments; i++)
+		sfree(sect->fragments[i]);
+	    sfree(sect->fragments);
+	    sfree(sect);
+	    sect = tmp;
+	}
+	sect = nonsects.head;
+	while (sect) {
+	    int i;
+	    tmp = sect->next;
+	    for (i=0; i < conf.ntfragments; i++)
+		sfree(sect->fragments[i]);
+	    sfree(sect->fragments);
+	    sfree(sect);
+	    sect = tmp;
+	}
+    }
+    {
+	htmlfile *file, *tmp;
+	file = files.head;
+	while (file) {
+	    tmp = file->next;
+	    sfree(file->filename);
+	    sfree(file);
+	    file = tmp;
+	}
+    }
+    {
+	int i;
+	indexentry *entry;
+	for (i = 0; (entry = index234(idx->entries, i)) != NULL; i++) {
+	    htmlindex *hi = (htmlindex *)entry->backend_data;
+	    sfree(hi);
+	}
+    }
+    {
+	paragraph *p;
+	word *w;
+	for (p = sourceform; p; p = p->next)
+	    for (w = p->words; w; w = w->next)
+		if (w->type == word_IndexRef) {
+		    htmlindexref *hr = (htmlindexref *)w->private_data;
+		    assert(hr != NULL);
+		    sfree(hr->fragment);
+		    sfree(hr);
+		}
+    }
+    sfree(conf.asect);
+    sfree(conf.single_filename);
+    sfree(conf.contents_filename);
+    sfree(conf.index_filename);
+    sfree(conf.template_filename);
+    while (conf.ntfragments--)
+	sfree(conf.template_fragments[conf.ntfragments]);
+    sfree(conf.template_fragments);
 }
 
 static void html_file_section(htmlconfig *cfg, htmlfilelist *files,
@@ -1427,8 +2075,12 @@ static void html_file_section(htmlconfig *cfg, htmlfilelist *files,
 	 * we invent a fresh file and put this section at its head.
 	 * Otherwise, we put it in the same file as its parent
 	 * section.
+	 * 
+	 * Another special value of cfg->leaf_level is -1, which
+	 * means infinity (i.e. it's considered to always be
+	 * greater than depth).
 	 */
-	if (ldepth > cfg->leaf_level) {
+	if (cfg->leaf_level > 0 && ldepth > cfg->leaf_level) {
 	    /*
 	     * We know that sect->parent cannot be NULL. The only
 	     * circumstance in which it can be is if sect is at
@@ -1484,7 +2136,8 @@ static htmlfile *html_new_file(htmlfilelist *list, char *filename)
 	list->head = ret;
     list->tail = ret;
 
-    ret->filename = dupstr(filename);
+    ret->filename = html_sanitise_filename(list, dupstr(filename));
+    add234(list->files, ret->filename);
     ret->last_fragment_number = 0;
     ret->min_heading_depth = INT_MAX;
     ret->first = ret->last = NULL;
@@ -1492,7 +2145,8 @@ static htmlfile *html_new_file(htmlfilelist *list, char *filename)
     return ret;
 }
 
-static htmlsect *html_new_sect(htmlsectlist *list, paragraph *title)
+static htmlsect *html_new_sect(htmlsectlist *list, paragraph *title,
+			       htmlconfig *cfg)
 {
     htmlsect *ret = snew(htmlsect);
 
@@ -1508,6 +2162,13 @@ static htmlsect *html_new_sect(htmlsectlist *list, paragraph *title)
     ret->parent = NULL;
     ret->type = NORMAL;
 
+    ret->fragments = snewn(cfg->ntfragments, char *);
+    {
+	int i;
+	for (i=0; i < cfg->ntfragments; i++)
+	    ret->fragments[i] = NULL;
+    }
+
     return ret;
 }
 
@@ -1515,7 +2176,7 @@ static void html_words(htmloutput *ho, word *words, int flags,
 		       htmlfile *file, keywordlist *keywords, htmlconfig *cfg)
 {
     word *w;
-    char *c;
+    char *c, *c2, *p, *q;
     int style, type;
 
     for (w = words; w; w = w->next) switch (w->type) {
@@ -1523,7 +2184,20 @@ static void html_words(htmloutput *ho, word *words, int flags,
 	if (flags & LINKS) {
 	    element_open(ho, "a");
 	    c = utoa_dup(w->text, CS_ASCII);
-	    element_attr(ho, "href", c);
+	    c2 = snewn(1 + 10*strlen(c), char);
+	    for (p = c, q = c2; *p; p++) {
+		if (*p == '&')
+		    q += sprintf(q, "&amp;");
+		else if (*p == '<')
+		    q += sprintf(q, "&lt;");
+		else if (*p == '>')
+		    q += sprintf(q, "&gt;");
+		else
+		    *q++ = *p;
+	    }
+	    *q = '\0';
+	    element_attr(ho, "href", c2);
+	    sfree(c2);
 	    sfree(c);
 	}
 	break;
@@ -1531,12 +2205,16 @@ static void html_words(htmloutput *ho, word *words, int flags,
       case word_LowerXref:
 	if (flags & LINKS) {
 	    keyword *kwl = kw_lookup(keywords, w->text);
-	    paragraph *p = kwl->para;
-	    htmlsect *s = (htmlsect *)p->private_data;
+	    paragraph *p;
+	    htmlsect *s;
+
+	    assert(kwl);
+	    p = kwl->para;
+	    s = (htmlsect *)p->private_data;
 
 	    assert(s);
 
-	    html_href(ho, file, s->file, s->fragment);
+	    html_href(ho, file, s->file, s->fragments[0]);
 	}
 	break;
       case word_HyperEnd:
@@ -1584,8 +2262,8 @@ static void html_words(htmloutput *ho, word *words, int flags,
 	    else
 		html_text(ho, cfg->rquote);
 	} else {
-	    if (cvt_ok(ho->charset, w->text) || !w->alt)
-		html_text(ho, w->text);
+	    if (!w->alt || cvt_ok(ho->restrict_charset, w->text))
+		html_text_nbsp(ho, w->text);
 	    else
 		html_words(ho, w->alt, flags, file, keywords, cfg);
 	}
@@ -1656,100 +2334,134 @@ static void html_charset_cleanup(htmloutput *ho)
 
     bytes = charset_from_unicode(NULL, NULL, outbuf, lenof(outbuf),
 				 ho->charset, &ho->cstate, NULL);
-    if (bytes > 0)
+    if (ho->fp && bytes > 0)
 	fwrite(outbuf, 1, bytes, ho->fp);
 }
 
+static void return_mostly_to_neutral(htmloutput *ho)
+{
+    if (ho->fp) {
+	if (ho->state == HO_IN_EMPTY_TAG && is_xhtml(ho->ver)) {
+	    fprintf(ho->fp, " />");
+	} else if (ho->state == HO_IN_EMPTY_TAG || ho->state == HO_IN_TAG) {
+	    fprintf(ho->fp, ">");
+	}
+    }
+
+    ho->state = HO_NEUTRAL;
+}
+
 static void return_to_neutral(htmloutput *ho)
 {
     if (ho->state == HO_IN_TEXT) {
 	html_charset_cleanup(ho);
-    } else if (ho->state == HO_IN_EMPTY_TAG && is_xhtml(ho->ver)) {
-	fprintf(ho->fp, " />");
-    } else if (ho->state == HO_IN_EMPTY_TAG || ho->state == HO_IN_TAG) {
-	fprintf(ho->fp, ">");
     }
 
-    ho->state = HO_NEUTRAL;
+    return_mostly_to_neutral(ho);
 }
 
 static void element_open(htmloutput *ho, char const *name)
 {
     return_to_neutral(ho);
-    fprintf(ho->fp, "<%s", name);
+    if (ho->fp)
+	fprintf(ho->fp, "<%s", name);
     ho->state = HO_IN_TAG;
 }
 
 static void element_close(htmloutput *ho, char const *name)
 {
     return_to_neutral(ho);
-    fprintf(ho->fp, "</%s>", name);
+    if (ho->fp)
+	fprintf(ho->fp, "</%s>", name);
     ho->state = HO_NEUTRAL;
 }
 
 static void element_empty(htmloutput *ho, char const *name)
 {
     return_to_neutral(ho);
-    fprintf(ho->fp, "<%s", name);
+    if (ho->fp)
+	fprintf(ho->fp, "<%s", name);
     ho->state = HO_IN_EMPTY_TAG;
 }
 
 static void html_nl(htmloutput *ho)
 {
     return_to_neutral(ho);
-    fputc('\n', ho->fp);
+    if (ho->fp)
+	fputc('\n', ho->fp);
 }
 
 static void html_raw(htmloutput *ho, char *text)
 {
     return_to_neutral(ho);
-    fputs(text, ho->fp);
+    if (ho->fp)
+	fputs(text, ho->fp);
 }
 
 static void html_raw_as_attr(htmloutput *ho, char *text)
 {
     assert(ho->state == HO_IN_TAG || ho->state == HO_IN_EMPTY_TAG);
-    fputc(' ', ho->fp);
-    fputs(text, ho->fp);
+    if (ho->fp) {
+	fputc(' ', ho->fp);
+	fputs(text, ho->fp);
+    }
 }
 
 static void element_attr(htmloutput *ho, char const *name, char const *value)
 {
     html_charset_cleanup(ho);
     assert(ho->state == HO_IN_TAG || ho->state == HO_IN_EMPTY_TAG);
-    fprintf(ho->fp, " %s=\"%s\"", name, value);
+    if (ho->fp)
+	fprintf(ho->fp, " %s=\"%s\"", name, value);
 }
 
 static void element_attr_w(htmloutput *ho, char const *name,
 			   wchar_t const *value)
 {
     html_charset_cleanup(ho);
-    fprintf(ho->fp, " %s=\"", name);
-    html_text_limit_internal(ho, value, 0, TRUE);
+    if (ho->fp)
+	fprintf(ho->fp, " %s=\"", name);
+    html_text_limit_internal(ho, value, 0, TRUE, FALSE);
     html_charset_cleanup(ho);
-    fputc('"', ho->fp);
+    if (ho->fp)
+	fputc('"', ho->fp);
 }
 
 static void html_text(htmloutput *ho, wchar_t const *text)
 {
-    html_text_limit(ho, text, 0);
+    return_mostly_to_neutral(ho);
+    html_text_limit_internal(ho, text, 0, FALSE, FALSE);
+}
+
+static void html_text_nbsp(htmloutput *ho, wchar_t const *text)
+{
+    return_mostly_to_neutral(ho);
+    html_text_limit_internal(ho, text, 0, FALSE, TRUE);
 }
 
 static void html_text_limit(htmloutput *ho, wchar_t const *text, int maxlen)
 {
-    return_to_neutral(ho);
-    html_text_limit_internal(ho, text, maxlen, FALSE);
+    return_mostly_to_neutral(ho);
+    html_text_limit_internal(ho, text, maxlen, FALSE, FALSE);
 }
 
 static void html_text_limit_internal(htmloutput *ho, wchar_t const *text,
-				     int maxlen, int quote_quotes)
+				     int maxlen, int quote_quotes, int nbsp)
 {
     int textlen = ustrlen(text);
     char outbuf[256];
     int bytes, err;
 
+    if (ho->hackflags & (HO_HACK_QUOTEQUOTES | HO_HACK_OMITQUOTES))
+	quote_quotes = TRUE;	       /* override the input value */
+
     if (maxlen > 0 && textlen > maxlen)
 	textlen = maxlen;
+    if (ho->hacklimit >= 0) {
+	if (textlen > ho->hacklimit)
+	    textlen = ho->hacklimit;
+	ho->hacklimit -= textlen;
+    }
 
     while (textlen > 0) {
 	/* Scan ahead for characters we really can't display in HTML. */
@@ -1758,13 +2470,14 @@ static void html_text_limit_internal(htmloutput *ho, wchar_t const *text,
 	    if (text[lenbefore] == L'<' ||
 		text[lenbefore] == L'>' ||
 		text[lenbefore] == L'&' ||
-		(text[lenbefore] == L'"' && quote_quotes))
+		(text[lenbefore] == L'"' && quote_quotes) ||
+		(text[lenbefore] == L' ' && nbsp))
 		break;
 	lenafter = lenbefore;
 	bytes = charset_from_unicode(&text, &lenafter, outbuf, lenof(outbuf),
 				     ho->charset, &ho->cstate, &err);
 	textlen -= (lenbefore - lenafter);
-	if (bytes > 0)
+	if (bytes > 0 && ho->fp)
 	    fwrite(outbuf, 1, bytes, ho->fp);
 	if (err) {
 	    /*
@@ -1773,23 +2486,35 @@ static void html_text_limit_internal(htmloutput *ho, wchar_t const *text,
 	     * we use an HTML numeric entity reference.
 	     */
 	    assert(textlen > 0);
-	    fprintf(ho->fp, "&#%ld;", (long int)*text);
+	    if (ho->fp)
+		fprintf(ho->fp, "&#%ld;", (long int)*text);
 	    text++, textlen--;
 	} else if (lenafter == 0 && textlen > 0) {
 	    /*
 	     * We have encountered a character which is special to
 	     * HTML.
 	     */
-	    if (*text == L'<')
-		fprintf(ho->fp, "&lt;");
-	    else if (*text == L'>')
-		fprintf(ho->fp, "&gt;");
-	    else if (*text == L'&')
-		fprintf(ho->fp, "&amp;");
-	    else if (*text == L'"')
-		fprintf(ho->fp, "&quot;");
-	    else
-		assert(!"Can't happen");
+	    if (ho->fp) {
+		if (*text == L'"' && (ho->hackflags & HO_HACK_OMITQUOTES)) {
+		    fputc('\'', ho->fp);
+		} else if (ho->hackflags & HO_HACK_QUOTENOTHING) {
+		    fputc(*text, ho->fp);
+		} else {
+		    if (*text == L'<')
+			fprintf(ho->fp, "&lt;");
+		    else if (*text == L'>')
+			fprintf(ho->fp, "&gt;");
+		    else if (*text == L'&')
+			fprintf(ho->fp, "&amp;");
+		    else if (*text == L'"')
+			fprintf(ho->fp, "&quot;");
+		    else if (*text == L' ') {
+			assert(nbsp);
+			fprintf(ho->fp, "&nbsp;");
+		    } else
+			assert(!"Can't happen");
+		}
+	    }
 	    text++, textlen--;
 	}
     }
@@ -1798,7 +2523,8 @@ static void html_text_limit_internal(htmloutput *ho, wchar_t const *text,
 static void cleanup(htmloutput *ho)
 {
     return_to_neutral(ho);
-    fclose(ho->fp);
+    if (ho->fp && ho->fp != stdout)
+	fclose(ho->fp);
 }
 
 static void html_href(htmloutput *ho, htmlfile *thisfile,
@@ -1872,6 +2598,7 @@ static char *html_format(paragraph *p, char *template_string)
 	    } else if (p->keyword && *p->keyword && fmt == 'k')
 		ws = p->keyword;
 	    else
+		/* %N comes here; also failure cases of other fmts */
 		w = p->words;
 
 	    if (ws) {
@@ -1925,6 +2652,13 @@ static char *html_sanitise_fragment(htmlfilelist *files, htmlfile *file,
 	*q = '\0';
     }
 
+    /* If there's nothing left, make something valid up */
+    if (!*text) {
+	static const char anonfrag[] = "anon";
+	text = sresize(text, lenof(anonfrag), char);
+	strcpy(text, anonfrag);
+    }
+
     /*
      * Now we check for clashes with other fragment names, and
      * adjust this one if necessary by appending a hyphen followed
@@ -1951,17 +2685,91 @@ static char *html_sanitise_fragment(htmlfilelist *files, htmlfile *file,
     return text;
 }
 
+static char *html_sanitise_filename(htmlfilelist *files, char *text)
+{
+    /*
+     * Unceremoniously rip out any character that might cause
+     * difficulty in some filesystem or another, or be otherwise
+     * inconvenient.
+     * 
+     * That doesn't leave much punctuation. I permit alphanumerics
+     * and +-.=_ only.
+     */
+    char *p = text, *q = text;
+
+    while (*p) {
+	if ((*p>='A' && *p<='Z') ||
+	    (*p>='a' && *p<='z') ||
+	    (*p>='0' && *p<='9') ||
+	    *p=='-' || *p=='_' || *p=='+' || *p=='.' || *p=='=')
+	    *q++ = *p;
+	p++;
+    }
+    *q = '\0';
+
+    /* If there's nothing left, make something valid up */
+    if (!*text) {
+	static const char anonfrag[] = "anon.html";
+	text = sresize(text, lenof(anonfrag), char);
+	strcpy(text, anonfrag);
+    }
+
+    /*
+     * Now we check for clashes with other filenames, and adjust
+     * this one if necessary by appending a hyphen followed by a
+     * number just before the file extension (if any).
+     */
+    {
+	int len, extpos;
+	int suffix = 1;
+
+	p = NULL;
+
+	while (find234(files->files, text, NULL)) {
+	    if (!p) {
+		len = strlen(text);
+		p = text;
+		text = snewn(len+20, char);
+
+		for (extpos = len; extpos > 0 && p[extpos-1] != '.'; extpos--);
+		if (extpos > 0)
+		    extpos--;
+		else
+		    extpos = len;
+	    }
+
+	    sprintf(text, "%.*s-%d%s", extpos, p, ++suffix, p+extpos);
+	}
+
+	if (p)
+	    sfree(p);
+    }
+
+    return text;
+}
+
 static void html_contents_entry(htmloutput *ho, int depth, htmlsect *s,
 				htmlfile *thisfile, keywordlist *keywords,
 				htmlconfig *cfg)
 {
+    if (ho->contents_level >= depth && ho->contents_level > 0) {
+	element_close(ho, "li");
+	html_nl(ho);
+    }
+
     while (ho->contents_level > depth) {
 	element_close(ho, "ul");
 	ho->contents_level--;
+	if (ho->contents_level > 0) {
+	    element_close(ho, "li");
+	}
+	html_nl(ho);
     }
 
     while (ho->contents_level < depth) {
+	html_nl(ho);
 	element_open(ho, "ul");
+	html_nl(ho);
 	ho->contents_level++;
     }
 
@@ -1969,10 +2777,10 @@ static void html_contents_entry(htmloutput *ho, int depth, htmlsect *s,
 	return;
 
     element_open(ho, "li");
-    html_href(ho, thisfile, s->file, s->fragment);
+    html_href(ho, thisfile, s->file, s->fragments[0]);
     html_section_title(ho, s, thisfile, keywords, cfg, FALSE);
     element_close(ho, "a");
-    element_close(ho, "li");
+    /* <li> will be closed by a later invocation */
 }
 
 static void html_section_title(htmloutput *ho, htmlsect *s, htmlfile *thisfile,
@@ -1993,7 +2801,7 @@ static void html_section_title(htmloutput *ho, htmlsect *s, htmlfile *thisfile,
 	else
 	    sl = &cfg->asect[cfg->nasect-1];
 
-	if (!sl)
+	if (!sl || !sl->number_at_all)
 	    number = NULL;
 	else if (sl->just_numbers)
 	    number = s->title->kwtext2;