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| 1 | +const isexe = require('isexe') |
| 2 | +const { join, delimiter, sep, posix } = require('path') |
| 3 | + |
| 4 | +const isWindows = process.platform === 'win32' |
| 5 | + |
| 6 | +// used to check for slashed in commands passed in. always checks for the posix |
| 7 | +// seperator on all platforms, and checks for the current separator when not on |
| 8 | +// a posix platform. don't use the isWindows check for this since that is mocked |
| 9 | +// in tests but we still need the code to actually work when called. that is also |
| 10 | +// why it is ignored from coverage. |
| 11 | +/* istanbul ignore next */ |
| 12 | +const rSlash = new RegExp(`[${posix.sep}${sep === posix.sep ? '' : sep}]`.replace(/(\\)/g, '\\$1')) |
| 13 | +const rRel = new RegExp(`^\\.${rSlash.source}`) |
| 14 | + |
| 15 | +const getNotFoundError = (cmd) => |
| 16 | + Object.assign(new Error(`not found: ${cmd}`), { code: 'ENOENT' }) |
| 17 | + |
| 18 | +const getPathInfo = (cmd, { |
| 19 | + path: optPath = process.env.PATH, |
| 20 | + pathExt: optPathExt = process.env.PATHEXT, |
| 21 | + delimiter: optDelimiter = delimiter, |
| 22 | +}) => { |
| 23 | + // If it has a slash, then we don't bother searching the pathenv. |
| 24 | + // just check the file itself, and that's it. |
| 25 | + const pathEnv = cmd.match(rSlash) ? [''] : [ |
| 26 | + // windows always checks the cwd first |
| 27 | + ...(isWindows ? [process.cwd()] : []), |
| 28 | + ...(optPath || /* istanbul ignore next: very unusual */ '').split(optDelimiter), |
| 29 | + ] |
| 30 | + |
| 31 | + if (isWindows) { |
| 32 | + const pathExtExe = optPathExt || |
| 33 | + ['.EXE', '.CMD', '.BAT', '.COM'].join(optDelimiter) |
| 34 | + const pathExt = pathExtExe.split(optDelimiter).reduce((acc, item) => { |
| 35 | + acc.push(item) |
| 36 | + acc.push(item.toLowerCase()) |
| 37 | + return acc |
| 38 | + }, []) |
| 39 | + if (cmd.includes('.') && pathExt[0] !== '') { |
| 40 | + pathExt.unshift('') |
| 41 | + } |
| 42 | + return { pathEnv, pathExt, pathExtExe } |
| 43 | + } |
| 44 | + |
| 45 | + return { pathEnv, pathExt: [''] } |
| 46 | +} |
| 47 | + |
| 48 | +const getPathPart = (raw, cmd) => { |
| 49 | + const pathPart = /^".*"$/.test(raw) ? raw.slice(1, -1) : raw |
| 50 | + const prefix = !pathPart && rRel.test(cmd) ? cmd.slice(0, 2) : '' |
| 51 | + return prefix + join(pathPart, cmd) |
| 52 | +} |
| 53 | + |
| 54 | +const which = async (cmd, opt = {}) => { |
| 55 | + const { pathEnv, pathExt, pathExtExe } = getPathInfo(cmd, opt) |
| 56 | + const found = [] |
| 57 | + |
| 58 | + for (const envPart of pathEnv) { |
| 59 | + const p = getPathPart(envPart, cmd) |
| 60 | + |
| 61 | + for (const ext of pathExt) { |
| 62 | + const withExt = p + ext |
| 63 | + const is = await isexe(withExt, { pathExt: pathExtExe, ignoreErrors: true }) |
| 64 | + if (is) { |
| 65 | + if (!opt.all) { |
| 66 | + return withExt |
| 67 | + } |
| 68 | + found.push(withExt) |
| 69 | + } |
| 70 | + } |
| 71 | + } |
| 72 | + |
| 73 | + if (opt.all && found.length) { |
| 74 | + return found |
| 75 | + } |
| 76 | + |
| 77 | + if (opt.nothrow) { |
| 78 | + return null |
| 79 | + } |
| 80 | + |
| 81 | + throw getNotFoundError(cmd) |
| 82 | +} |
| 83 | + |
| 84 | +const whichSync = (cmd, opt = {}) => { |
| 85 | + const { pathEnv, pathExt, pathExtExe } = getPathInfo(cmd, opt) |
| 86 | + const found = [] |
| 87 | + |
| 88 | + for (const pathEnvPart of pathEnv) { |
| 89 | + const p = getPathPart(pathEnvPart, cmd) |
| 90 | + |
| 91 | + for (const ext of pathExt) { |
| 92 | + const withExt = p + ext |
| 93 | + const is = isexe.sync(withExt, { pathExt: pathExtExe, ignoreErrors: true }) |
| 94 | + if (is) { |
| 95 | + if (!opt.all) { |
| 96 | + return withExt |
| 97 | + } |
| 98 | + found.push(withExt) |
| 99 | + } |
| 100 | + } |
| 101 | + } |
| 102 | + |
| 103 | + if (opt.all && found.length) { |
| 104 | + return found |
| 105 | + } |
| 106 | + |
| 107 | + if (opt.nothrow) { |
| 108 | + return null |
| 109 | + } |
| 110 | + |
| 111 | + throw getNotFoundError(cmd) |
| 112 | +} |
| 113 | + |
| 114 | +module.exports = which |
| 115 | +which.sync = whichSync |
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