dialyzer: Add an --no_indentation option

By default Dialyzer tries to improve the readability of warnings.
Newlines are inserted before and inside types, signatures, and Erlang
code. Sometimes the newlines look misplaced. The raw format
(option --raw) is not affected.

Use the new --no_indentation option get the old behavior (no inserted
line breaks).

A note on the implementation. The types &c present in the warning
tuples are parsed, and then formatted using erl_pp, the Erlang Pretty
Printer. The alternative, to create message tuples with formatted
types, turned out to more complicated, and has no real benefits.

Also notice that the fixes for binaries (commit 9db8a098) and union
elements (commit a1e51d12) are required. As a consequence, messages
created before these commits using the --raw option cannot always be
indented.

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/dialyzer/src/dialyzer_options.erl b/lib/dialyzer/src/dialyzer_options.erl
index 03040f8e38..3b30036c1c 100644
--- a/lib/dialyzer/src/dialyzer_options.erl
+++ b/lib/dialyzer/src/dialyzer_options.erl
@@ -177,6 +177,8 @@ build_options([{OptionName, Value} = Term|Rest], Options) ->
     filename_opt ->
       assert_filename_opt(Value),
       build_options(Rest, Options#options{filename_opt = Value});
+    indent_opt ->
+      build_options(Rest, Options#options{indent_opt = Value});
     output_plt ->
       assert_filename(Value),
       build_options(Rest, Options#options{output_plt = Value});