[PATCH 2/3] lib/config: add known config key "show.extra_headers"

[David Bremner <david@tethera.net>]

Used in a following commit to enable including extra headers beyond
the default in structured output.
---
 lib/config.cc          | 3 +++
 lib/notmuch.h          | 1 +
 test/T590-libconfig.sh | 4 ++++
 3 files changed, 8 insertions(+)

diff --git a/lib/config.cc b/lib/config.cc
index 7a2882de..97060f8b 100644
--- a/lib/config.cc
+++ b/lib/config.cc
@@ -596,6 +596,8 @@ _notmuch_config_key_to_string (notmuch_config_key_t key)
 	return "user.name";
     case NOTMUCH_CONFIG_AUTOCOMMIT:
 	return "database.autocommit";
+    case NOTMUCH_CONFIG_EXTRA_HEADERS:
+	return "show.extra_headers";
     default:
 	return NULL;
     }
@@ -643,6 +645,7 @@ _notmuch_config_default (notmuch_database_t *notmuch, notmuch_config_key_t key)
 	return "";
     case NOTMUCH_CONFIG_AUTOCOMMIT:
 	return "8000";
+    case NOTMUCH_CONFIG_EXTRA_HEADERS:
     case NOTMUCH_CONFIG_HOOK_DIR:
     case NOTMUCH_CONFIG_BACKUP_DIR:
     case NOTMUCH_CONFIG_OTHER_EMAIL:
diff --git a/lib/notmuch.h b/lib/notmuch.h
index 1b2bdf3f..a75a42be 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -2546,6 +2546,7 @@ typedef enum {
     NOTMUCH_CONFIG_OTHER_EMAIL,
     NOTMUCH_CONFIG_USER_NAME,
     NOTMUCH_CONFIG_AUTOCOMMIT,
+    NOTMUCH_CONFIG_EXTRA_HEADERS,
     NOTMUCH_CONFIG_LAST
 } notmuch_config_key_t;
 
diff --git a/test/T590-libconfig.sh b/test/T590-libconfig.sh
index eb303444..7ee4bb11 100755
--- a/test/T590-libconfig.sh
+++ b/test/T590-libconfig.sh
@@ -439,6 +439,7 @@ cat <<'EOF' >EXPECTED
 09: 'NULL'
 10: 'USER_FULL_NAME'
 11: '8000'
+12: 'NULL'
 == stderr ==
 EOF
 unset MAILDIR
@@ -749,6 +750,7 @@ cat <<'EOF' >EXPECTED
 09: 'test_suite_other@notmuchmail.org;test_suite@otherdomain.org'
 10: 'Notmuch Test Suite'
 11: '8000'
+12: 'NULL'
 == stderr ==
 EOF
 test_expect_equal_file EXPECTED OUTPUT
@@ -782,6 +784,7 @@ cat <<'EOF' >EXPECTED
 09: 'NULL'
 10: 'USER_FULL_NAME'
 11: '8000'
+12: 'NULL'
 == stderr ==
 EOF
 test_expect_equal_file EXPECTED OUTPUT.clean
@@ -858,6 +861,7 @@ maildir.synchronize_flags true
 new.ignore sekrit_junk
 new.tags unread;inbox
 search.exclude_tags foo;bar;fub
+show.extra_headers (null)
 test.key1 testvalue1
 test.key2 testvalue2
 user.name Notmuch Test Suite
-- 
2.34.1