nimpretty shall support pipe on stdin, to stdout

[litlighilit]

Summary

nimpretty currently must run on nim files (passed as arguments),

and lacks the feature of pipe.

Description

Formatter of other langs, like rustfmt, gofmt, allows reading stdin and outputting to stdout,

which is handy, for example, in vim, you can simply use :%!rustfmt to format current source code file.

Yet neither :%!nimpretty or :%!nimpretty - doesn't work, as it currently expects one or more files as arguments.

Alternatives

Write to a temp file, nimpretty it and then cat it.

In addition, according to #8458 (comment), relying on bash substitution won't work

Examples

No response

Backwards Compatibility

None.

This just allows a cli usage used to be invalid

Links

#8458 (comment)

[Araq]

Fine with me if enabled via an explicit --stdin switch.

[litlighilit]

Fine with me if enabled via an explicit --stdin switch.

How about via - switch, which is also widely available throughout UNIX utils.

(Or like gofmt & rustfmt, no args means reading from stdin)

Maybe --stdin switch isn't very widely used for such cases?

[Araq]

Nimsuggest uses --stdin and it's better to be consistent with ourselves than to be consistent with others who never care about consistency with Nim either.

[ire4ever1190]

Mean - would also be consistent since it's supported for nim/nim check

echo "echo 1" | nim r -

outputs "1"

[Araq]

Alright then nimpretty better supports both - and --stdin.