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32b5520ff1
mitsuhiko immediately jumped into the examples and got tripped up by the lack of documentation on feature flags needed. I limited this to just the root ones because the rest are in a more proper tutorial that steps through it all.
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This requires enabling the derive feature flag.
You can use -- to escape further arguments.
Let's see what this looks like in the help:
$ escaped_positional_derive --help
clap [..]
A simple to use, efficient, and full-featured Command Line Argument Parser
USAGE:
escaped_positional_derive[EXE] [OPTIONS] [-- <SLOP>...]
ARGS:
<SLOP>...
OPTIONS:
-f
-h, --help Print help information
-p <PEAR>
-V, --version Print version information
Here is a baseline without any arguments:
$ escaped_positional_derive
-f used: false
-p's value: None
'slops' values: []
Notice that we can't pass positional arguments before --:
$ escaped_positional_derive foo bar
? failed
error: Found argument 'foo' which wasn't expected, or isn't valid in this context
USAGE:
escaped_positional_derive[EXE] [OPTIONS] [-- <SLOP>...]
For more information try --help
But you can after:
$ escaped_positional_derive -f -p=bob -- sloppy slop slop
-f used: true
-p's value: Some("bob")
'slops' values: ["sloppy", "slop", "slop"]
As mentioned, the parser will directly pass everything through:
$ escaped_positional_derive -- -f -p=bob sloppy slop slop
-f used: false
-p's value: None
'slops' values: ["-f", "-p=bob", "sloppy", "slop", "slop"]