Ng-clp (no-grammar definition command-line parser) is one of Rust's command-line parsers. A normal command-line parser generates a parser from the definition of command-line options that accepts a command line according to its grammar. In contrast, ng-clp uses a universal parser to discover what it assumes to be options or arguments from the given command-line arguments.
You can run a sample program with cargo run as follows:
sh
$ cargo run -- foo -bar bal --bra boo
Argument: foo
Option: -b ar
Argument: bal
Option: --bra boo
The arguments, flags, and options accepted by ng-clp can be described as follows (option names, arguments, etc. are capitalized here to be easier to distinguish).
| Format | Parsed |
| --------- | ------------------------------------- |
| -A | Flag -A. |
| -A BC | Option -A with argument BC. |
| -ABC | Option -A with argument BC. |
| --AB | Flag --AB. |
| --AB CD | Option --AB with the argument CD. |
| --AB=CD | Option --AB with argument CD. |
"But isn't that ambiguous?" If you are wondering, you are correct.
When the command line is:
-a bc
ng-clp allows treating with the command line in the following two interpretations.
-a appears (with no argument; the following bc is a normal command-line argument that has nothing to do with the flag -a).-a appears with argument bc.(1) Add a dependency to ng-clp and anyhow in Cargo.toml:
[dependencies]
ng-clp = "0.2"
anyhow = "1.0"
(2) Copy the boilerplate code boilerplate/main.rs in your main.rs and modify it.
MIT/Apache-2.0
ng-clp is based on the same idea as the original product gzclp, but their APIs are completely different from each other.