Add type completions

UltiSnips/proto.snippets

@@ -1,5 +1,28 @@
 priority -50
 
+global !p
+
+from vimsnippets import complete
+
+FIELD_TYPES = [
+	'double',
+	'float',
+	'int32',
+	'int64',
+	'uint32',
+	'uint64',
+	'sint32',
+	'sint64',
+	'fixed32',
+	'fixed64',
+	'sfixed32',
+	'sfixed64',
+	'bool',
+	'string',
+	'bytes']
+
+endglobal
+
 snippet mess "Proto message" b
 // ${2:TODO(`whoami`): Describe this message.}
 message ${1:Name} {
@@ -10,17 +33,17 @@ endsnippet
 
 snippet reqf "Required field" b
 // ${4:TODO(`whoami`): Describe this field.}
-optional ${1:type} ${2:name} = ${3:1};  // Required
+optional ${1:type}`!p snip.rv = complete(t[1], FIELD_TYPES)` ${2:name} = ${3:1};  // Required
 endsnippet
 
 snippet optf "Optional field" b
 // ${4:TODO(`whoami`): Describe this field.}
-optional ${1:type} ${2:name} = ${3:1};
+optional ${1:type}`!p snip.rv = complete(t[1], FIELD_TYPES)` ${2:name} = ${3:1};
 endsnippet
 
 snippet repf "Repeated field" b
 // ${4:TODO(`whoami`): Describe this field.}
-repeated ${1:type} ${2:name} = ${3:1};
+repeated ${1:type}`!p snip.rv = complete(t[1], FIELD_TYPES)` ${2:name} = ${3:1};
 endsnippet
 
 snippet enum "Enumeration" b