[PATCH] ruby: add bindings for `notmuch_database_get_all_tags`

diff --git a/a4/fdd1a6f960013b62ece00e41d0c62c49f19509 b/a4/fdd1a6f960013b62ece00e41d0c62c49f19509
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+From: Ludovic LANGE <ll-notmuchmail@lange.nom.fr>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH] ruby: add bindings for `notmuch_database_get_all_tags`\r
+Date: Sun, 16 Nov 2014 20:58:12 +0100\r
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+\r
+The Ruby bindings were missing a way to get all the tags of the\r
+database. Now you should be able to access this with the public\r
+instance method `all_tags` of your database object.\r
+\r
+Example of use:\r
+    notmuchdb = Notmuch::Database.new path, { :create => false, \r
+       :mode => Notmuch::MODE_READ_ONLY }\r
+\r
+    my_tags = notmuchdb.all_tags\r
+\r
+    my_tags.each { |tag|\r
+      print tag\r
+    }\r
+\r
+    my_tags.destroy!\r
+---\r
+ NEWS                     |  9 +++++++++\r
+ bindings/ruby/database.c | 20 ++++++++++++++++++++\r
+ bindings/ruby/defs.h     |  3 +++\r
+ bindings/ruby/init.c     |  1 +\r
+ 4 files changed, 33 insertions(+)\r
+\r
+diff --git a/NEWS b/NEWS\r
+index 44e8d05..bcd368f 100644\r
+--- a/NEWS\r
++++ b/NEWS\r
+@@ -1,3 +1,12 @@\r
++Notmuch X.XX (201X-XX-XX)\r
++=========================\r
++\r
++Ruby Bindings\r
++-------------\r
++\r
++Add support for `notmuch_database_get_all_tags`\r
++\r
++\r
+ Notmuch 0.19 (2014-11-14)\r
+ =========================\r
+ \r
+diff --git a/bindings/ruby/database.c b/bindings/ruby/database.c\r
+index c03d701..dd36ca8 100644\r
+--- a/bindings/ruby/database.c\r
++++ b/bindings/ruby/database.c\r
+@@ -375,6 +375,26 @@ notmuch_rb_database_find_message_by_filename (VALUE self, VALUE pathv)\r
+ }\r
+ \r
+ /*\r
++ * call-seq: DB.get_all_tags() => TAGS\r
++ *\r
++ * Returns a list of all tags found in the database.\r
++ */\r
++VALUE\r
++notmuch_rb_database_get_all_tags (VALUE self)\r
++{\r
++    notmuch_database_t *db;\r
++    notmuch_tags_t *tags;\r
++\r
++    Data_Get_Notmuch_Database (self, db);\r
++\r
++    tags = notmuch_database_get_all_tags (db);\r
++    if (!tags)\r
++      rb_raise (notmuch_rb_eMemoryError, "Out of memory");\r
++\r
++    return Data_Wrap_Struct (notmuch_rb_cTags, NULL, NULL, tags);\r
++}\r
++\r
++/*\r
+  * call-seq: DB.query(query) => QUERY\r
+  *\r
+  * Retrieve a query object for the query string 'query'\r
+diff --git a/bindings/ruby/defs.h b/bindings/ruby/defs.h\r
+index f4901a0..167250e 100644\r
+--- a/bindings/ruby/defs.h\r
++++ b/bindings/ruby/defs.h\r
+@@ -178,6 +178,9 @@ VALUE\r
+ notmuch_rb_database_find_message_by_filename (VALUE self, VALUE pathv);\r
+ \r
+ VALUE\r
++notmuch_rb_database_get_all_tags (VALUE self);\r
++\r
++VALUE\r
+ notmuch_rb_database_query_create (VALUE self, VALUE qstrv);\r
+ \r
+ /* directory.c */\r
+diff --git a/bindings/ruby/init.c b/bindings/ruby/init.c\r
+index ab3f22d..865d6bf 100644\r
+--- a/bindings/ruby/init.c\r
++++ b/bindings/ruby/init.c\r
+@@ -229,6 +229,7 @@ Init_notmuch (void)\r
+                     notmuch_rb_database_find_message, 1); /* in database.c */\r
+     rb_define_method (notmuch_rb_cDatabase, "find_message_by_filename",\r
+                     notmuch_rb_database_find_message_by_filename, 1); /* in database.c */\r
++    rb_define_method (notmuch_rb_cDatabase, "all_tags", notmuch_rb_database_get_all_tags, 0); /* in database.c */\r
+     rb_define_method (notmuch_rb_cDatabase, "query", notmuch_rb_database_query_create, 1); /* in database.c */\r
+ \r
+     /*\r
+-- \r
+1.8.0\r
+\r