Errors in source files return success

[Marco Patzer via ntg-context <ntg-context@ntg.nl>]

Hi!

ConTeXt can detect issues in the sources and report them on the
console with the argument --errors or with \enabledirectives
[logs.errors]. The return value is still “0” (=success) even with
errors present.

Right now I use a script that parses the log file and lets me know
if a run has issues. However, it would be great if context could
return a non-zero value if errors are present. I've found that

  \enabledirectives
    [logs.errors=missing characters]

returns “1” if characters are missing. Lovely!

Undefined control sequences always return 1 (a TeX thing I believe
and not related to the macro package). But undefined control
sequences don't show up on the console as the other errors do if
general output (except errors) is silenced e.g. with

  context --silent --noconsole --nostatistics --errors <file>

The question is, what other directives can be enabled that make
context return a failure? Is there a way to return failure if *any*
error is encountered or do they need to be enabled each
individually? And is there a way to show hard TeX errors as
undefined control sequences as a “possible issue” if output is
silenced?

MWE:

%% enables logging of errors same as --errors AFAIK
\enabledirectives
  [logs.errors]

%% makes context return 1 on missing chars, great!
%% \enabledirectives
%%   [logs.errors=missing characters]

\starttext

%% missing characters
𝒜

%% missing figure
\externalfigure [foo]

%% \end occurred inside a group at level 1
%% ### semi simple group … entered at line
\startalignment [middle]
  foo

%% missing references
See \in{section}[sec:none].

%% undefined control sequence
%% \undefined

\stoptext

Marco
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