Add a contrib_humanize module for the intcomma filter

src/erlydtl_contrib_humanize.erl

@@ -0,0 +1,18 @@
+-module(erlydtl_contrib_humanize).
+
+-export([intcomma/1]).
+
+intcomma(Value) when is_integer(Value) ->
+	intcomma(integer_to_list(Value));
+intcomma(Value) ->
+	ValueBin = iolist_to_binary(Value),
+	intcomma(ValueBin, size(ValueBin) rem 3, <<>>).
+
+intcomma(<<>>, _, Acc) ->
+	Acc;
+intcomma(<< C, Rest/bits >>, 0, <<>>) ->
+	intcomma(Rest, 2, << C >>);
+intcomma(<< C, Rest/bits >>, 0, Acc) ->
+	intcomma(Rest, 2, << Acc/binary, $,, C >>);
+intcomma(<< C, Rest/bits >>, N, Acc) ->
+	intcomma(Rest, N - 1, << Acc/binary, C >>).

tests/src/erlydtl_unittests.erl

@@ -1059,12 +1059,18 @@ tests() ->
      {"unicode", [
              {"(tm) somewhere",
                  <<"™">>, [], <<"™">>}
+        ]},
+     {"contrib_humanize", [
+             {"intcomma",
+                 <<"{{ a|intcomma }} {{ b|intcomma }} {{ c|intcomma }} {{ d|intcomma }}">>,
+                     [{a, 999}, {b, 123456789}, {c, 12345}, {d, 1234567890}],
+                     <<"999 123,456,789 12,345 1,234,567,890">>}
         ]}
     ].
  
 run_tests() ->
     io:format("Running unit tests...~n"),
-    DefaultOptions = [],
+    DefaultOptions = [{custom_filters_modules, [erlydtl_contrib_humanize]}],
     Failures = lists:foldl(
         fun({Group, Assertions}, GroupAcc) ->
                 io:format(" Test group ~p...~n", [Group]),