mdocml: support more than one tag entry for the same search term;

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
support more than one tag entry for the same search term;
general idea discussed with bcook@ during l2k16

Modified Files:
--------------
    mdocml:
        tag.c

Revision Data
-------------
Index: tag.c
===================================================================
RCS file: /home/cvs/mdocml/mdocml/tag.c,v
retrieving revision 1.13
retrieving revision 1.14
diff -Ltag.c -Ltag.c -u -p -r1.13 -r1.14
--- tag.c
+++ tag.c
@@ -1,6 +1,6 @@
 /*	$Id$ */
 /*
- * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2015, 2016 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -31,7 +31,9 @@
 #include "tag.h"
 
 struct tag_entry {
-	size_t	 line;
+	size_t	*lines;
+	size_t	 maxlines;
+	size_t	 nlines;
 	int	 prio;
 	char	 s[];
 };
@@ -130,16 +132,42 @@ tag_put(const char *s, int prio, size_t 
 
 	if (tag_files.tfd <= 0 || strchr(s, ' ') != NULL)
 		return;
+
 	slot = ohash_qlookup(&tag_data, s);
 	entry = ohash_find(&tag_data, slot);
+
 	if (entry == NULL) {
+
+		/* Build a new entry. */
+
 		len = strlen(s) + 1;
 		entry = mandoc_malloc(sizeof(*entry) + len);
 		memcpy(entry->s, s, len);
+		entry->lines = NULL;
+		entry->maxlines = entry->nlines = 0;
 		ohash_insert(&tag_data, slot, entry);
-	} else if (entry->prio <= prio)
-		return;
-	entry->line = line;
+
+	} else {
+
+		/* A better entry is already present, ignore the new one. */
+
+		if (entry->prio < prio)
+			return;
+
+		/* The existing entry is worse, clear it. */
+
+		if (entry->prio > prio)
+			entry->nlines = 0;
+	}
+
+	/* Remember the new line. */
+
+	if (entry->maxlines == entry->nlines) {
+		entry->maxlines += 4;
+		entry->lines = mandoc_reallocarray(entry->lines,
+		    entry->maxlines, sizeof(*entry->lines));
+	}
+	entry->lines[entry->nlines++] = line;
 	entry->prio = prio;
 }
 
@@ -152,6 +180,7 @@ tag_write(void)
 {
 	FILE			*stream;
 	struct tag_entry	*entry;
+	size_t			 i;
 	unsigned int		 slot;
 
 	if (tag_files.tfd <= 0)
@@ -160,8 +189,10 @@ tag_write(void)
 	entry = ohash_first(&tag_data, &slot);
 	while (entry != NULL) {
 		if (stream != NULL)
-			fprintf(stream, "%s %s %zu\n",
-			    entry->s, tag_files.ofn, entry->line);
+			for (i = 0; i < entry->nlines; i++)
+				fprintf(stream, "%s %s %zu\n",
+				    entry->s, tag_files.ofn, entry->lines[i]);
+		free(entry->lines);
 		free(entry);
 		entry = ohash_next(&tag_data, &slot);
 	}
--
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