add support for custom tags and filters

queries/highlights.scm

@@ -25,6 +25,7 @@ variable: (identifier) @variable.parameter
     ("in")
     ("=")
     ("|")
+    (":")
     (".")] @operator
 
 [
@@ -90,74 +91,72 @@ tag: [
     ("with")
     ("endwith")] @function
 
-(filter .
-    [
-        ("add:")
+(filter
+    name: [
+        ("add")
         ("addslashes")
         ("capfirst")
-        ("center:")
-        ("cut:")
+        ("center")
+        ("cut")
         ("date")
-        ("date:")
-        ("default:")
-        ("default_if_none:")
-        ("dictsort:")
-        ("dictsortreversed:")
-        ("divisibleby:")
+        ("default")
+        ("default_if_none")
+        ("dictsort")
+        ("dictsortreversed")
+        ("divisibleby")
         ("escape")
         ("escapejs")
         ("escapeseq")
         ("filesizeformat")
         ("first")
         ("floatformat")
-        ("floatformat:")
         ("force_escape")
-        ("get_digit:")
+        ("get_digit")
         ("iriencode")
-        ("join:")
+        ("join")
         ("json_script")
-        ("json_script:")
         ("last")
         ("length")
         ("linebreaks")
         ("linebreaksbr")
         ("linenumbers")
-        ("ljust:")
+        ("ljust")
         ("lower")
         ("make_list")
         ("phone2numeric")
         ("pluralize")
-        ("pluralize:")
         ("pprint")
         ("random")
-        ("rjust:")
+        ("rjust")
         ("safe")
         ("safeseq")
-        ("slice:")
+        ("slice")
         ("slugify")
-        ("stringformat:")
+        ("stringformat")
         ("striptags")
         ("time")
-        ("time:")
         ("timesince")
-        ("timesince:")
         ("timeuntil")
-        ("timeuntil:")
         ("title")
-        ("truncatechars:")
-        ("truncatechars_html:")
-        ("truncatewords:")
-        ("truncatewords_html:")
+        ("truncatechars")
+        ("truncatechars_html")
+        ("truncatewords")
+        ("truncatewords_html")
         ("unordered_list")
         ("upper")
         ("urlencode")
-        ("urlencode:")
         ("urlize")
-        ("urlizetrunc:")
+        ("urlizetrunc")
         ("wordcount")
-        ("wordwrap:")
-        ("yesno")
-        ("yesno:")] @function)
+        ("wordwrap")
+        ("yesno")] @function)
+
+; a filter or tag a "load" brought in, whose name the grammar does not know
+(filter
+    name: (identifier) @function.call)
+
+(custom_tag
+    tag: (identifier) @function.call)
 
 (load
     (identifier) @function)