git-cat-file/lib/cli-lib.ts

A pure-JavaScript implementation of `git cat-file -p` for Node.js.

/**
 * https://github.com/kawanet/git-cat-file
 */

import processArgv from "process.argv"

interface Options<L, S> {
    long: L
    short: S
    args: string[]
}

export function parseOptions<L extends object, S extends object>(input: Options<L, S>): Options<L, S> {
    const argv = processArgv(input.args)({}) as L & {"--"?: string[]}
    const args: string[] = argv["--"] || []

    const shortDef = input.short
    const shortParams: any = {}

    while (/^-/.test(args[0])) {
        const key = args.shift().slice(1) as keyof typeof shortDef
        if (!(key in shortDef)) {
            shortParams.h = true
            break
        }
        if ("string" === typeof shortDef[key]) {
            shortParams[key] = args.shift()
        } else {
            shortParams[key] = true
        }
    }

    return {long: argv, short: shortParams, args}
}