--format flag order matters

[marcospb19]

Version

0.4.2

Description

When compressing an archive with --format, not all positions are supported and the error message isn't helpful.

Current Behavior

ouch compress a b c output --format tar.gz # 1
ouch compress a b c --format tar.gz output # 2
ouch compress a b --format tar.gz c output # 3
ouch compress a --format tar.gz b c output # 4
ouch compress --format tar.gz a b c output # 5

1 and 5 works, 2-4 doesn't.

Error message for 3:

$ ouch compress a b --format tar.gz c output
error: unexpected argument 'c' found

Usage: ouch compress [OPTIONS] <FILES>... <OUTPUT>

For more information, try '--help'.

---

To show that it also happens with a single file as input:

ouch compress input output --format gz # 6
ouch compress input --format gz output # 7
ouch compress --format gz input output # 8

6 and 8 works, 7 doesn't.

Error message for 7:

$ ouch compress input --format gz output
error: unexpected argument 'output' found

Usage: ouch compress [OPTIONS] <FILES>... <OUTPUT>

For more information, try '--help'.

Expected Behavior

1-8 should all work.

Additional Information

We should add more tests for CLI usage that cover these.

[marcospb19]

Looks like this is a limitation of clap, issue at clap-rs/clap#5115.