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authorMagnus Henoch <[email protected]>2015-01-14 19:14:38 +0000
committerMagnus Henoch <[email protected]>2016-02-15 11:41:54 +0000
commite5fe2f89638dedb08da2114558d229fe18dcd14e (patch)
tree4e043cbcaaaab158996d6f776bedf5417a2e5ee1 /lib
parent43454b36efafe336f24190a84039edb1643e53ea (diff)
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Prettify default error_logger output somewhat
The default error logger, the one in use before a more sophisticated error logger can be installed, has rather terse output, in part because it cannot rely on io:format. This patch attempts to improve the error logger within that constraint: - Print timestamps as YYYY-MM-DD HH:MM:SS - For error reports with format strings, just print the format string and the format arguments on separate lines - For error reports with tuple lists, print each pair on a separate line
Diffstat (limited to 'lib')
-rw-r--r--lib/kernel/src/error_logger.erl81
1 files changed, 79 insertions, 2 deletions
diff --git a/lib/kernel/src/error_logger.erl b/lib/kernel/src/error_logger.erl
index b8fbf02feb..5cf750c40b 100644
--- a/lib/kernel/src/error_logger.erl
+++ b/lib/kernel/src/error_logger.erl
@@ -434,5 +434,82 @@ add_node(X, Pid) ->
%% Can't do io_lib:format
-display2(Tag,F,A) ->
- erlang:display({error_logger,Tag,F,A}).
+display2({{_Y,_Mo,_D},{_H,_Mi,_S}} = Date, F, A) ->
+ display_date(Date),
+ display3(string_p(F), F, A).
+
+display_date({{Y,Mo,D},{H,Mi,S}}) ->
+ erlang:display_string(
+ integer_to_list(Y) ++ "-" ++
+ two_digits(Mo) ++ "-" ++
+ two_digits(D) ++ " " ++
+ two_digits(H) ++ ":" ++
+ two_digits(Mi) ++ ":" ++
+ two_digits(S) ++ " ").
+
+two_digits(N) when 0 =< N, N =< 9 ->
+ [$0, $0 + N];
+two_digits(N) ->
+ integer_to_list(N).
+
+display3(true, F, A) ->
+ %% Format string with arguments
+ erlang:display_string(F ++ "\n"),
+ [begin
+ erlang:display_string("\t"),
+ erlang:display(Arg)
+ end || Arg <- A],
+ ok;
+display3(false, Atom, A) when is_atom(Atom) ->
+ %% The widest atom seems to be 'supervisor_report' at 17.
+ ColumnWidth = 20,
+ AtomString = atom_to_list(Atom),
+ AtomLength = length(AtomString),
+ Padding = lists:duplicate(ColumnWidth - AtomLength, $\s),
+ erlang:display_string(AtomString ++ Padding),
+ display4(A);
+display3(_, F, A) ->
+ erlang:display({F, A}).
+
+display4([A, []]) ->
+ %% Not sure why crash reports look like this.
+ display4(A);
+display4(A = [_|_]) ->
+ case lists:all(fun({Key,_Value}) -> is_atom(Key); (_) -> false end, A) of
+ true ->
+ erlang:display_string("\n"),
+ lists:foreach(
+ fun({Key, Value}) ->
+ erlang:display_string(
+ " " ++
+ atom_to_list(Key) ++
+ ": "),
+ erlang:display(Value)
+ end, A);
+ false ->
+ erlang:display(A)
+ end;
+display4(A) ->
+ erlang:display(A).
+
+string_p([]) ->
+ false;
+string_p(Term) ->
+ string_p1(Term).
+
+string_p1([H|T]) when is_integer(H), H >= $\s, H < 255 ->
+ string_p1(T);
+string_p1([$\n|T]) -> string_p1(T);
+string_p1([$\r|T]) -> string_p1(T);
+string_p1([$\t|T]) -> string_p1(T);
+string_p1([$\v|T]) -> string_p1(T);
+string_p1([$\b|T]) -> string_p1(T);
+string_p1([$\f|T]) -> string_p1(T);
+string_p1([$\e|T]) -> string_p1(T);
+string_p1([H|T]) when is_list(H) ->
+ case string_p1(H) of
+ true -> string_p1(T);
+ _ -> false
+ end;
+string_p1([]) -> true;
+string_p1(_) -> false.