regression: `echo 'discard' | nim c -r -` generates a file '-' ; `-` should be treated specially

[timotheecour]

- is special and indicates stdin; it shouldn't be used as output filename. - is bad because it breaks many shell commands, eg: ls - requires quoting.

Example

echo 'echo 0.3' | nim c -r -

Current Output

creates a file ./- in current dir: $PWD/-

Expected Output

in nim 0.18.0 it used to create ./stdinfile; that's better; however IMO it should be hidden inside nimcache.

• option 1 (simple, and should probably be implemented first)
  create a $nimcache/@stdin & $exeExt

• option 2
  creates a temporary file $nimcache/$random & $exeExt (random so it won't clobber in case other commands are run simultaneously while a program is executing etc, even though os would make it safe in that case but still)
  the temporary file would auto-delete upon child process exiting

Additional Information

• recent devel 1.1.1 e441542

• as noted Passing code via stdin to Nim stopped working [regression Nim 0.19+] #11294 (comment)

You can always use /dev/stdin instead of -.

(but - should still work)

[kaushalmodi]

Related: #11294 (comment)