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Copy pathcli-options.ts
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174 lines (153 loc) · 4.3 KB
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export type InlineValueOption<Key extends string> = {
prefix: string;
key: Key;
};
export const CLI_SEMVER_PATTERN = /^\d+\.\d+\.\d+(?:-[0-9A-Za-z.-]+)?$/;
type ParserConfig<
Parsed extends object,
ValueKey extends keyof Parsed & string,
BooleanKey extends keyof Parsed & string,
> = {
inlineValueOptions: Array<InlineValueOption<ValueKey>>;
valueOptions: Map<string, ValueKey>;
booleanOptions: Map<string, BooleanKey>;
parsePositional: (arg: string, index: number) => number;
fail: (message: string) => never;
};
export function parseMappedArgument<
Parsed extends object,
ValueKey extends keyof Parsed & string,
BooleanKey extends keyof Parsed & string,
>(
args: string[],
index: number,
parsed: Parsed,
config: ParserConfig<Parsed, ValueKey, BooleanKey>,
) {
const arg = args[index];
if (applyInlineValueOption(arg, parsed, config.inlineValueOptions)) {
return index;
}
if (applyBooleanOption(arg, parsed, config.booleanOptions)) {
return index;
}
return applyValueOrPositionalOption(args, index, parsed, config, arg);
}
function applyInlineValueOption<Parsed extends object, ValueKey extends keyof Parsed & string>(
arg: string,
parsed: Parsed,
inlineOptions: Array<InlineValueOption<ValueKey>>,
) {
const option = inlineOptions.find((candidate) => arg.startsWith(candidate.prefix));
if (!option) {
return false;
}
parsed[option.key] = arg.slice(option.prefix.length) as Parsed[ValueKey];
return true;
}
function applyBooleanOption<Parsed extends object, BooleanKey extends keyof Parsed & string>(
arg: string,
parsed: Parsed,
booleanOptions: Map<string, BooleanKey>,
) {
const option = booleanOptions.get(arg);
if (!option) {
return false;
}
parsed[option] = true as Parsed[BooleanKey];
return true;
}
function applyValueOrPositionalOption<
Parsed extends object,
ValueKey extends keyof Parsed & string,
BooleanKey extends keyof Parsed & string,
>(
args: string[],
index: number,
parsed: Parsed,
config: ParserConfig<Parsed, ValueKey, BooleanKey>,
arg: string,
) {
const option = config.valueOptions.get(arg);
if (!option) {
return config.parsePositional(arg, index);
}
parsed[option] = readNextArg(args, index, arg, config.fail) as Parsed[ValueKey];
return index + 1;
}
export function parseVersionOptionArgument<
Parsed extends { version?: string },
ValueKey extends keyof Parsed & string,
BooleanKey extends keyof Parsed & string,
>(
args: string[],
index: number,
parsed: Parsed,
config: Omit<ParserConfig<Parsed, ValueKey, BooleanKey>, "parsePositional"> & {
printUsage: () => void;
},
) {
return parseMappedArgument(args, index, parsed, {
...config,
parsePositional: (arg, positionalIndex) =>
parseVersionOrHelp(arg, positionalIndex, parsed, config),
});
}
function parseVersionOrHelp<Parsed extends { version?: string }>(
arg: string,
index: number,
parsed: Parsed,
config: { printUsage: () => void; fail: (message: string) => never },
) {
if (arg === "--help" || arg === "-h") {
config.printUsage();
process.exit(0);
}
parsed.version = parseVersionPositionalArg(arg, parsed.version, config.fail);
return index;
}
export function parseVersionPositionalArg(
arg: string,
currentVersion: string | undefined,
fail: (message: string) => never,
) {
if (arg.startsWith("--")) {
fail(`Unknown option: ${arg}`);
}
if (currentVersion) {
fail(`Unexpected positional argument: ${arg}`);
}
return arg.replace(/^v/, "");
}
export function readNextArg(
args: string[],
index: number,
flag: string,
fail: (message: string) => never,
) {
const value = args[index + 1];
if (!value || value.startsWith("--")) {
fail(`Missing value for ${flag}`);
}
return value;
}
export function validateCliVersion(
version: string,
pattern: RegExp,
fail: (message: string) => never,
) {
if (!pattern.test(version)) {
fail(`Invalid semver: ${version}`);
}
}
export function validateCliDate(date: string, fail: (message: string) => never) {
if (!/^\d{4}-\d{2}-\d{2}$/.test(date)) {
fail(`Invalid date: ${date}. Expected YYYY-MM-DD.`);
}
}
export function optionalFlagArg(flag: string, enabled: boolean) {
return enabled ? [flag] : [];
}
export function optionalValueArg(flag: string, value: string | undefined) {
return value ? [flag, value] : [];
}