Add heredoc support - fixes #20

Author: alexlouden

Terraform.YAML-tmLanguage

@@ -82,6 +82,16 @@ patterns:
   patterns:
   - include: '#string_interpolation'
 
+- name: string.unquoted.heredoc.terraform
+  begin: (?>\s*<<(\w+))
+  beginCaptures:
+    '0': {name: punctuation.definition.string.begin.terraform}
+    '1': {name: keyword.operator.heredoc.terraform}
+  end: ^\1$
+  endCaptures:
+    '0': {name: punctuation.definition.string.end.terraform}
+    '0': {name: keyword.operator.heredoc.terraform}
+
 repository:
   string_interpolation:
     patterns:

Terraform.tmLanguage

@@ -253,6 +253,35 @@
 				</dict>
 			</array>
 		</dict>
+		<dict>
+			<key>begin</key>
+			<string>(?&gt;\s*&lt;&lt;(\w+))</string>
+			<key>beginCaptures</key>
+			<dict>
+				<key>0</key>
+				<dict>
+					<key>name</key>
+					<string>punctuation.definition.string.begin.terraform</string>
+				</dict>
+				<key>1</key>
+				<dict>
+					<key>name</key>
+					<string>keyword.operator.heredoc.terraform</string>
+				</dict>
+			</dict>
+			<key>end</key>
+			<string>^\1$</string>
+			<key>endCaptures</key>
+			<dict>
+				<key>0</key>
+				<dict>
+					<key>name</key>
+					<string>keyword.operator.heredoc.terraform</string>
+				</dict>
+			</dict>
+			<key>name</key>
+			<string>string.unquoted.heredoc.terraform</string>
+		</dict>
 	</array>
 	<key>repository</key>
 	<dict>