implement tag priority 0, which will tag only keys that appear as

tag candidates exactly once, and use it for .Em and .Sy;
written on the TGV Toulouse-Paris

1 files changed, 11 insertions, 3 deletions

diff --git a/tag.c b/tag.c
index 5106ae46..e7e402b2 100644
--- a/tag.c
+++ b/tag.c
@@ -155,14 +155,22 @@ tag_put(const char *s, int prio, size_t line)
 
 	} else {
 
+		/* Handle priority 0 entries. */
+
+		if (prio == 0) {
+			if (entry->prio == 0)
+				entry->prio = -1;
+			return;
+		}
+
 		/* A better entry is already present, ignore the new one. */
 
-		if (entry->prio < prio)
+		if (entry->prio > 0 && entry->prio < prio)
 			return;
 
 		/* The existing entry is worse, clear it. */
 
-		if (entry->prio > prio)
+		if (entry->prio < 1 || entry->prio > prio)
 			entry->nlines = 0;
 	}
 
@@ -194,7 +202,7 @@ tag_write(void)
 	stream = fdopen(tag_files.tfd, "w");
 	entry = ohash_first(&tag_data, &slot);
 	while (entry != NULL) {
-		if (stream != NULL)
+		if (stream != NULL && entry->prio >= 0)
 			for (i = 0; i < entry->nlines; i++)
 				fprintf(stream, "%s %s %zu\n",
 				    entry->s, tag_files.ofn, entry->lines[i]);