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index.js
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const { isexe, sync: isexeSync } = require('isexe') const { join, delimiter, sep, posix } = require('path') const isWindows = process.platform === 'win32' // used to check for slashed in commands passed in. always checks for the posix // seperator on all platforms, and checks for the current separator when not on // a posix platform. don't use the isWindows check for this since that is mocked // in tests but we still need the code to actually work when called. that is also // why it is ignored from coverage. /* istanbul ignore next */ const rSlash = new RegExp(`[${posix.sep}${sep === posix.sep ? '' : sep}]`.replace(/(\\)/g, '\\$1')) const rRel = new RegExp(`^\\.${rSlash.source}`) const getNotFoundError = (cmd) => Object.assign(new Error(`not found: ${cmd}`), { code: 'ENOENT' }) const getPathInfo = (cmd, { path: optPath = process.env.PATH, pathExt: optPathExt = process.env.PATHEXT, delimiter: optDelimiter = delimiter, }) => { // If it has a slash, then we don't bother searching the pathenv. // just check the file itself, and that's it. const pathEnv = cmd.match(rSlash) ? [''] : [ // windows always checks the cwd first ...(isWindows ? [process.cwd()] : []), ...(optPath || /* istanbul ignore next: very unusual */ '').split(optDelimiter), ] if (isWindows) { const pathExtExe = optPathExt || ['.EXE', '.CMD', '.BAT', '.COM'].join(optDelimiter) const pathExt = pathExtExe.split(optDelimiter).flatMap((item) => [item, item.toLowerCase()]) if (cmd.includes('.') && pathExt[0] !== '') { pathExt.unshift('') } return { pathEnv, pathExt, pathExtExe } } return { pathEnv, pathExt: [''] } } const getPathPart = (raw, cmd) => { const pathPart = /^".*"$/.test(raw) ? raw.slice(1, -1) : raw const prefix = !pathPart && rRel.test(cmd) ? cmd.slice(0, 2) : '' return prefix + join(pathPart, cmd) } const which = async (cmd, opt = {}) => { const { pathEnv, pathExt, pathExtExe } = getPathInfo(cmd, opt) const found = [] for (const envPart of pathEnv) { const p = getPathPart(envPart, cmd) for (const ext of pathExt) { const withExt = p + ext const is = await isexe(withExt, { pathExt: pathExtExe, ignoreErrors: true }) if (is) { if (!opt.all) { return withExt } found.push(withExt) } } } if (opt.all && found.length) { return found } if (opt.nothrow) { return null } throw getNotFoundError(cmd) } const whichSync = (cmd, opt = {}) => { const { pathEnv, pathExt, pathExtExe } = getPathInfo(cmd, opt) const found = [] for (const pathEnvPart of pathEnv) { const p = getPathPart(pathEnvPart, cmd) for (const ext of pathExt) { const withExt = p + ext const is = isexeSync(withExt, { pathExt: pathExtExe, ignoreErrors: true }) if (is) { if (!opt.all) { return withExt } found.push(withExt) } } } if (opt.all && found.length) { return found } if (opt.nothrow) { return null } throw getNotFoundError(cmd) } module.exports = which which.sync = whichSync