trailers: export action enums and corresponding lookup functions

diff --git a/trailer.h b/trailer.h
index 65cc5d79c6cecfce5cf3302dd7dcb6323f9f85dc..2b39a1bee05d3bd71ef78187f73259fd74eddffa 100644 (file)
--- a/trailer.h
+++ b/trailer.h
@@ -1,6 +1,28 @@
 #ifndef TRAILER_H
 #define TRAILER_H
 
+enum trailer_where {
+       WHERE_END,
+       WHERE_AFTER,
+       WHERE_BEFORE,
+       WHERE_START
+};
+enum trailer_if_exists {
+       EXISTS_ADD_IF_DIFFERENT_NEIGHBOR,
+       EXISTS_ADD_IF_DIFFERENT,
+       EXISTS_ADD,
+       EXISTS_REPLACE,
+       EXISTS_DO_NOTHING
+};
+enum trailer_if_missing {
+       MISSING_ADD,
+       MISSING_DO_NOTHING
+};
+
+int trailer_set_where(enum trailer_where *item, const char *value);
+int trailer_set_if_exists(enum trailer_if_exists *item, const char *value);
+int trailer_set_if_missing(enum trailer_if_missing *item, const char *value);
+
 struct trailer_info {
        /*
         * True if there is a blank line before the location pointed to by