Improve Doxygen snippets

UltiSnips/c_doxygen.snippets

@@ -1,20 +1,28 @@
-snippet "/// p" "Doxygen param tag"
+snippet "/// p" "Doxygen parameter block"
 /// @param${1/.+/[/}$1${1/.+/]/} $0
 endsnippet
 
-snippet "/// b" "Doxygen brief tag"
+snippet "/// t" "Doxygen template parameter block"
+/// @tparam $0
+endsnippet
+
+snippet "/// b" "Doxygen brief block"
 /// @brief $0
 endsnippet
 
-snippet "/// r" "Doxygen return tag"
+snippet "/// r" "Doxygen return block"
 /// @return $0
 endsnippet
 
-snippet "/// n" "Doxygen note tag"
+snippet "/// n" "Doxygen note block"
 /// @note $0
 endsnippet
 
-snippet doxygen "Doxygen file block" b
+snippet "/// a" "Doxygen attention block"
+/// @attention $0
+endsnippet
+
+snippet file "Doxygen file block" b
 /// @file
 ///
 /// @brief $0
@@ -23,6 +31,25 @@ snippet doxygen "Doxygen file block" b
 /// Copyright (C) 2002-2016 Codeplay Software Limited. All Rights Reserved.
 endsnippet
 
-snippet cp "Doxygen copydoc block"
-@copydoc $0
+snippet "/// cp" "Doxygen copydoc block"
+/// @copydoc $0
+endsnippet
+
+global !p
+def complete(t, opts):
+	if t:
+		opts = [m[len(t):] for m in opts if m.startswith(t)]
+	if len(opts) == 1:
+		return opts[0]
+	elif len(opts) == 0:
+		return ""
+	return '|'.join(opts)
+endglobal
+
+snippet "/// d" "Doxygen dot graph block"
+/// @dot${1: "${2:caption}"}
+/// $3`!p snip.rv=complete(t[3], ['graph', 'digraph'])` ${4:name} {
+///		$0
+/// }
+/// @enddot
 endsnippet