[WIP patch 4/9] lib: add and test function to retrieve current metadata value

[David Bremner]

---
 lib/metadata.cc       | 11 +++++++++++
 lib/notmuch.h         |  7 +++++++
 test/T590-metadata.sh |  2 ++
 3 files changed, 20 insertions(+)

diff --git a/lib/metadata.cc b/lib/metadata.cc
index 20805e5..6236992 100644
--- a/lib/metadata.cc
+++ b/lib/metadata.cc
@@ -227,4 +227,15 @@ notmuch_metadata_key (notmuch_metadata_t *metadata)
 }
 
 const char *
+notmuch_metadata_value (notmuch_metadata_t *metadata)
+{
+    const char *key = notmuch_metadata_key (metadata);
+    char *val;
+    notmuch_status_t status;
+
+    status=notmuch_database_get_metadata (metadata->notmuch, metadata->mclass, key, &val);
+    if (status)
+	return NULL;
+
+    return val;
 }
diff --git a/lib/notmuch.h b/lib/notmuch.h
index 16d0973..dd359c8 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -1872,6 +1872,13 @@ notmuch_metadata_valid (notmuch_metadata_t *metadata);
  */
 const char *
 notmuch_metadata_key (notmuch_metadata_t *metadata);
+
+/**
+ * return value for current metadata pair
+ */
+const char *
+notmuch_metadata_value (notmuch_metadata_t *metadata);
+
 /* @} */
 
 NOTMUCH_END_DECLS
diff --git a/test/T590-metadata.sh b/test/T590-metadata.sh
index 2c44746..d2326d4 100755
--- a/test/T590-metadata.sh
+++ b/test/T590-metadata.sh
@@ -62,12 +62,14 @@ cat c_head - c_tail <<'EOF' | test_C ${MAIL_DIR}
    RUN(notmuch_database_get_all_metadata (db, NOTMUCH_METADATA_CONFIG, &meta));
    printf("valid = %d\n", notmuch_metadata_valid (meta));
    printf("key = %s\n", notmuch_metadata_key (meta));
+   printf("val = %s\n", notmuch_metadata_value (meta));
 }
 EOF
 cat <<'EOF' >EXPECTED
 == stdout ==
 valid = 1
 key = testkey1
+val = testvalue1
 == stderr ==
 EOF
 test_expect_equal_file EXPECTED OUTPUT
-- 
2.6.4