A simple proposal would be to add the "-e" option (fail on error) to fish
2.2.x so we can start testing + provide feedback on the feature.
In 3.x, the default behavior would change to fail-on-error. An
environment variable (FISH_FAIL_ON_ERROR=0 ?) could be used to override the
default behavior for backward-compatibility. The "-e" option would
override the environment variable.
On Tue, Nov 12, 2013 at 8:26 PM, Martin Bähr <
mba...@email.archlab.tuwien.ac.at> wrote:
> On Wed, Nov 13, 2013 at 10:49:24AM +0800, David Adam wrote:
> > > I also think ignoring errors should be explicit; the default should be
> > > exit-on-failure (though I'll understand that it might be too late to
> change
> > > due to backward compatibility)
> > It would definitely have to wait for a new major release of fish, I
> think.
>
> indeed. though i wonder what would be a good path to not surprise anyone
> with such a change?
>
> start with printing a warning now?
> and educate users on how to write the script so that it doesn't crash?
>
> (how would that look like btw?
> false; # this would generate a warning first and
> cause an exit later.
> false; or true; # this would catch the warning and error.
> false; or echo $status; true; # handle the error)
> false; or exit; # force exit, works now, will continue to
> work in the future.
>
> add an option/setting equivalent to bash -e which will turn into a no-op
> later, so that people can write scripts in a future-compatible way and
> test whether such a change is even feasable.
>
> also, how to check if there is actually a fatal error?
> programs use the exit status to convey other information than just an
> error. maybe this should only happen on the values given here:
>
> http://tldp.org/LDP/abs/html/exitcodes.html#EXITCODESREF
>
> 1 Catchall for general errors
> 2 Misuse of shell builtins (bash)
> 126 Command invoked cannot execute
> 127 "command not found"
> 128 Invalid argument to exit
> 128+n Fatal error signal "n"
> 130 Script terminated by Control-C (abd also by ctrl-z)
> 255* Exit status out of range
>
> this is more complex that it looked initially.
>
> greetings, martin.
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>
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