[PATCH] ruby: add bindings for `notmuch_database_get_all_tags`

[Ludovic LANGE]

The Ruby bindings were missing a way to get all the tags of the
database. Now you should be able to access this with the public
instance method `all_tags` of your database object.

Example of use:
    notmuchdb = Notmuch::Database.new path, { :create => false, 
    	:mode => Notmuch::MODE_READ_ONLY }

    my_tags = notmuchdb.all_tags

    my_tags.each { |tag|
      print tag
    }

    my_tags.destroy!
---
 NEWS                     |  9 +++++++++
 bindings/ruby/database.c | 20 ++++++++++++++++++++
 bindings/ruby/defs.h     |  3 +++
 bindings/ruby/init.c     |  1 +
 4 files changed, 33 insertions(+)

diff --git a/NEWS b/NEWS
index 44e8d05..bcd368f 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,12 @@
+Notmuch X.XX (201X-XX-XX)
+=========================
+
+Ruby Bindings
+-------------
+
+Add support for `notmuch_database_get_all_tags`
+
+
 Notmuch 0.19 (2014-11-14)
 =========================
 
diff --git a/bindings/ruby/database.c b/bindings/ruby/database.c
index c03d701..dd36ca8 100644
--- a/bindings/ruby/database.c
+++ b/bindings/ruby/database.c
@@ -375,6 +375,26 @@ notmuch_rb_database_find_message_by_filename (VALUE self, VALUE pathv)
 }
 
 /*
+ * call-seq: DB.get_all_tags() => TAGS
+ *
+ * Returns a list of all tags found in the database.
+ */
+VALUE
+notmuch_rb_database_get_all_tags (VALUE self)
+{
+    notmuch_database_t *db;
+    notmuch_tags_t *tags;
+
+    Data_Get_Notmuch_Database (self, db);
+
+    tags = notmuch_database_get_all_tags (db);
+    if (!tags)
+    	rb_raise (notmuch_rb_eMemoryError, "Out of memory");
+
+    return Data_Wrap_Struct (notmuch_rb_cTags, NULL, NULL, tags);
+}
+
+/*
  * call-seq: DB.query(query) => QUERY
  *
  * Retrieve a query object for the query string 'query'
diff --git a/bindings/ruby/defs.h b/bindings/ruby/defs.h
index f4901a0..167250e 100644
--- a/bindings/ruby/defs.h
+++ b/bindings/ruby/defs.h
@@ -178,6 +178,9 @@ VALUE
 notmuch_rb_database_find_message_by_filename (VALUE self, VALUE pathv);
 
 VALUE
+notmuch_rb_database_get_all_tags (VALUE self);
+
+VALUE
 notmuch_rb_database_query_create (VALUE self, VALUE qstrv);
 
 /* directory.c */
diff --git a/bindings/ruby/init.c b/bindings/ruby/init.c
index ab3f22d..865d6bf 100644
--- a/bindings/ruby/init.c
+++ b/bindings/ruby/init.c
@@ -229,6 +229,7 @@ Init_notmuch (void)
 		      notmuch_rb_database_find_message, 1); /* in database.c */
     rb_define_method (notmuch_rb_cDatabase, "find_message_by_filename",
 		      notmuch_rb_database_find_message_by_filename, 1); /* in database.c */
+    rb_define_method (notmuch_rb_cDatabase, "all_tags", notmuch_rb_database_get_all_tags, 0); /* in database.c */
     rb_define_method (notmuch_rb_cDatabase, "query", notmuch_rb_database_query_create, 1); /* in database.c */
 
     /*
-- 
1.8.0