[PATCH 4/4] lib: make notmuch_query_add_tag_exclude return a status value

[David Bremner]

Since this is an ABI breaking change, bump the SONAME.
---
 lib/notmuch.h    | 23 +++++++++++++++++++----
 lib/query.cc     |  7 ++++---
 notmuch-count.c  |  9 +++++++--
 notmuch-search.c | 12 ++++++++++--
 notmuch-show.c   | 13 +++++++++++--
 5 files changed, 51 insertions(+), 13 deletions(-)

diff --git a/lib/notmuch.h b/lib/notmuch.h
index 16da8be9..74043819 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -55,8 +55,8 @@ NOTMUCH_BEGIN_DECLS
  * The library version number.  This must agree with the soname
  * version in Makefile.local.
  */
-#define LIBNOTMUCH_MAJOR_VERSION	4
-#define LIBNOTMUCH_MINOR_VERSION	4
+#define LIBNOTMUCH_MAJOR_VERSION	5
+#define LIBNOTMUCH_MINOR_VERSION	0
 #define LIBNOTMUCH_MICRO_VERSION	0
 
 
@@ -180,6 +180,11 @@ typedef enum _notmuch_status {
      */
     NOTMUCH_STATUS_PATH_ERROR,
     /**
+     * The requested operation was ignored. Depending on the function,
+     * this may not be an actual error.
+     */
+    NOTMUCH_STATUS_IGNORED,
+    /**
      * One of the arguments violates the preconditions for the
      * function, in a way not covered by a more specific argument.
      */
@@ -812,10 +817,20 @@ notmuch_query_get_sort (const notmuch_query_t *query);
 
 /**
  * Add a tag that will be excluded from the query results by default.
- * This exclusion will be overridden if this tag appears explicitly in
+ * This exclusion will be ignored if this tag appears explicitly in
  * the query.
+ *
+ * @returns
+ *
+ * NOTMUCH_STATUS_SUCCESS: excluded was added successfully.
+ *
+ * NOTMUCH_STATUS_XAPIAN_EXCEPTION: a Xapian exception occured.
+ *      Most likely a problem lazily parsing the query string.
+ *
+ * NOTMUCH_STATUS_IGNORED: tag is explicitely present in the query, so
+ *		not excluded.
  */
-void
+notmuch_status_t
 notmuch_query_add_tag_exclude (notmuch_query_t *query, const char *tag);
 
 /**
diff --git a/lib/query.cc b/lib/query.cc
index c0a1cdf8..c027edd3 100644
--- a/lib/query.cc
+++ b/lib/query.cc
@@ -174,7 +174,7 @@ notmuch_query_get_sort (const notmuch_query_t *query)
     return query->sort;
 }
 
-void
+notmuch_status_t
 notmuch_query_add_tag_exclude (notmuch_query_t *query, const char *tag)
 {
     notmuch_status_t status;
@@ -182,13 +182,14 @@ notmuch_query_add_tag_exclude (notmuch_query_t *query, const char *tag)
 
     status = _notmuch_query_ensure_parsed (query);
     if (status)
-	return; /* XXX report error */
+	return status;
 
     term = talloc_asprintf (query, "%s%s", _find_prefix ("tag"), tag);
     if (query->terms.count(term) != 0)
-	return; /* XXX report ignoring exclude? */
+	return NOTMUCH_STATUS_IGNORED;
 
     _notmuch_string_list_append (query->exclude_terms, term);
+    return NOTMUCH_STATUS_SUCCESS;
 }
 
 /* We end up having to call the destructors explicitly because we had
diff --git a/notmuch-count.c b/notmuch-count.c
index 35a2aa70..3207c015 100644
--- a/notmuch-count.c
+++ b/notmuch-count.c
@@ -87,8 +87,13 @@ print_count (notmuch_database_t *notmuch, const char *query_str,
 	return -1;
     }
 
-    for (i = 0; i < exclude_tags_length; i++)
-	notmuch_query_add_tag_exclude (query, exclude_tags[i]);
+    for (i = 0; i < exclude_tags_length; i++) {
+	status = notmuch_query_add_tag_exclude (query, exclude_tags[i]);
+	if (status && status != NOTMUCH_STATUS_IGNORED) {
+	    print_status_query ("notmuch count", query, status);
+	    return -1;
+	}
+    }
 
     switch (output) {
     case OUTPUT_MESSAGES:
diff --git a/notmuch-search.c b/notmuch-search.c
index 8c65d5ad..64a98110 100644
--- a/notmuch-search.c
+++ b/notmuch-search.c
@@ -735,11 +735,19 @@ _notmuch_search_prepare (search_context_t *ctx, notmuch_config_t *config, int ar
     if (ctx->exclude != NOTMUCH_EXCLUDE_FALSE) {
 	const char **search_exclude_tags;
 	size_t search_exclude_tags_length;
+	notmuch_status_t status;
 
 	search_exclude_tags = notmuch_config_get_search_exclude_tags
 	    (config, &search_exclude_tags_length);
-	for (i = 0; i < search_exclude_tags_length; i++)
-	    notmuch_query_add_tag_exclude (ctx->query, search_exclude_tags[i]);
+
+	for (i = 0; i < search_exclude_tags_length; i++) {
+	    status = notmuch_query_add_tag_exclude (ctx->query, search_exclude_tags[i]);
+	    if (status && status != NOTMUCH_STATUS_IGNORED) {
+		print_status_query ("notmuch search", ctx->query, status);
+		return EXIT_FAILURE;
+	    }
+	}
+
 	notmuch_query_set_omit_excluded (ctx->query, ctx->exclude);
     }
 
diff --git a/notmuch-show.c b/notmuch-show.c
index 22fa655a..4c63959f 100644
--- a/notmuch-show.c
+++ b/notmuch-show.c
@@ -1157,11 +1157,19 @@ notmuch_show_command (notmuch_config_t *config, int argc, char *argv[])
 	const char **search_exclude_tags;
 	size_t search_exclude_tags_length;
 	unsigned int i;
+	notmuch_status_t status;
 
 	search_exclude_tags = notmuch_config_get_search_exclude_tags
 	    (config, &search_exclude_tags_length);
-	for (i = 0; i < search_exclude_tags_length; i++)
-	    notmuch_query_add_tag_exclude (query, search_exclude_tags[i]);
+
+	for (i = 0; i < search_exclude_tags_length; i++) {
+	    status = notmuch_query_add_tag_exclude (query, search_exclude_tags[i]);
+	    if (status && status != NOTMUCH_STATUS_IGNORED) {
+		print_status_query ("notmuch show", query, status);
+		ret = -1;
+		goto DONE;
+	    }
+	}
 
 	if (exclude == EXCLUDE_FALSE) {
 	    notmuch_query_set_omit_excluded (query, FALSE);
@@ -1171,6 +1179,7 @@ notmuch_show_command (notmuch_config_t *config, int argc, char *argv[])
 	ret = do_show (config, query, format, sprinter, &params);
     }
 
+ DONE:
     notmuch_crypto_cleanup (&params.crypto);
     notmuch_query_destroy (query);
     notmuch_database_destroy (notmuch);
-- 
2.11.0