Implement KDL Query Language

[jihchi]

Original idea comes from kdl-org/kdl#55

Such that we could use KDL Query Language as the query and transform kdl.

KDL Query Language Spec

Changelogs

• Implement a parser for KDL Query Language Spec
• Integrate the parser into this CLI tool

Examples

Based on https://github.com/kdl-org/kdl/blob/main/QUERY-SPEC.md#examples

$ cat example.kdl
package {
    name "foo"
    version "1.0.0"
    dependencies platform="windows" {
        winapi "1.0.0" path="./crates/my-winapi-fork"
    }
    dependencies {
        miette "2.0.0" dev=true
    }
}

$ cat example.kdl | kq "package name"
name "foo"

$ cat example.kdl | kq "dependencies"
dependencies platform="windows" {
    winapi "1.0.0" path="./crates/my-winapi-fork"
}
dependencies {
    miette "2.0.0" dev=true
}

$ cat example.kdl | kq "dependencies[platform]"
dependencies platform="windows" {
    winapi "1.0.0" path="./crates/my-winapi-fork"
}

$ cat example.kdl | kq "dependencies > []"
winapi "1.0.0" path="./crates/my-winapi-fork"
miette "2.0.0" dev=true