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export interface ParsedArgs {
named: { [index: string]: string|number|boolean|undefined|string[]|number[] };
positional: string[];
}
export interface ArgSchema {
aliases: { [index: string]: string },
named: {
[index: string]: {
isFlag?: boolean;
parseAs?: 'number' | 'boolean' | 'string[]' | 'number[]';
description?: string;
},
},
positional: { name: string; }[],
}
export function describe(schema: ArgSchema) {
console.log(`usage: lait <options> ${schema.positional.map(x => `[${x.name}]`).join(' ')}`);
console.log('options:');
const pairs = Object.keys(schema.named).map(name => {
const options = schema.named[name];
const alias = Object.keys(schema.aliases).find(x => schema.aliases[x] === name);
return {
left: `--${name}${alias ? ` (-${alias})` : ''}`,
right: options.description,
};
});
const targetLength = _.max(pairs.map(x => x.left.length))!;
for (const option of pairs) {
const filler = new Array(targetLength - option.left.length).fill(' ').join('');
console.log(`\t${option.left}${filler}\t${option.right}`);
}
}
export function getArgs(processArgs: string[], schema: ArgSchema) {
const args: ParsedArgs = { named: {}, positional: [] };
// First pull out non-positional args
const rawArgs: (string|undefined)[] = processArgs.slice(2);
for (let i = 0; i < rawArgs.length; i++) {
const arg = rawArgs[i];
if (!arg) {
continue;
}
if (arg.startsWith('-')) {
const strippedDash = arg.replace(/^-{1,2}/, '');
const getFullName = (name: string) => name in schema.aliases ? schema.aliases[name] : name;
const getValue = (name: string, value: string) => {
const parseAs = schema.named[name].parseAs;
if (!parseAs || parseAs === 'string[]') {
return value;
}
if (parseAs === 'number' || parseAs === 'number[]') {
return parseFloat(value);
} else {
return value.toLowerCase() === 'true';
}
};
const applyValue = (argName: string, value: string | number | boolean) => {
if (!(schema.named[argName].parseAs || '').endsWith('[]')) {
args.named[argName] = value;
} else {
if (!args.named[argName]) {
args.named[argName] = [];
}
(args.named[argName] as any[]).push(value);
}
};
if (strippedDash.includes('=')) {
const parts = strippedDash.split('=');
const argName = getFullName(parts[0]);
applyValue(argName, getValue(argName, parts.slice(1).join('=')));
rawArgs[i] = undefined;
} else {
const argName = getFullName(strippedDash);
if (schema.named[argName]?.isFlag) {
args.named[argName] = true;
rawArgs[i] = undefined;
} else {
if (i === rawArgs.length - 1 ) {
throw new Error(`Missing value for flag ${argName}`);
} else {
applyValue(argName, getValue(argName, rawArgs[i + 1]!));
rawArgs[i] = undefined;
rawArgs[i + 1] = undefined;
}
}
}
}
}
// now do positional
for (let i = 0; i < rawArgs.length; i++) {
const arg = rawArgs[i];
if (arg) {
args.positional.push(arg);
}
}
return args;
}
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