detect-shell/lib/esm/index.js

detect shells available on the system

var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __asyncValues = (this && this.__asyncValues) || function (o) {
    if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
    var m = o[Symbol.asyncIterator], i;
    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
};
import os from 'os';
import { readFile, stat, lstat } from './pfs';
import { normalize, basename } from 'path';
import { enumeratePowerShellInstallations } from './powershell';
const platform = {
    isWindows: process.platform === 'win32',
    isMacintosh: process.platform === 'darwin',
    isLinux: process.platform === 'linux'
};
export function getWindowsBuildNumber() {
    const osVersion = /(\d+)\.(\d+)\.(\d+)/g.exec(os.release());
    let buildNumber = 0;
    if (osVersion && osVersion.length === 4) {
        buildNumber = parseInt(osVersion[3]);
    }
    return buildNumber;
}
export function detectAvailableShells() {
    return platform.isWindows ? detectAvailableWindowsShells() : detectAvailableUnixShells();
}
function detectAvailableWindowsShells() {
    var e_1, _a;
    return __awaiter(this, void 0, void 0, function* () {
        const is32ProcessOn64Windows = process.env.hasOwnProperty('PROCESSOR_ARCHITEW6432');
        const system32Path = `${process.env['windir']}\\${is32ProcessOn64Windows ? 'Sysnative' : 'System32'}`;
        let useWSLexe = false;
        if (getWindowsBuildNumber() >= 16299) {
            useWSLexe = true;
        }
        const expectedLocations = {
            'Command Prompt': [`${system32Path}\\cmd.exe`],
            'WSL Bash': [`${system32Path}\\${useWSLexe ? 'wsl.exe' : 'bash.exe'}`],
            'Git Bash': [
                `${process.env['ProgramW6432']}\\Git\\bin\\bash.exe`,
                `${process.env['ProgramW6432']}\\Git\\usr\\bin\\bash.exe`,
                `${process.env['ProgramFiles']}\\Git\\bin\\bash.exe`,
                `${process.env['ProgramFiles']}\\Git\\usr\\bin\\bash.exe`,
                `${process.env['LocalAppData']}\\Programs\\Git\\bin\\bash.exe`
            ],
            Cygwin: [
                `${process.env['HOMEDRIVE']}\\cygwin64\\bin\\bash.exe`,
                `${process.env['HOMEDRIVE']}\\cygwin\\bin\\bash.exe`
            ]
        };
        try {
            // Add all of the different kinds of PowerShells
            for (var _b = __asyncValues(enumeratePowerShellInstallations()), _c; _c = yield _b.next(), !_c.done;) {
                const pwshExe = _c.value;
                expectedLocations[pwshExe.displayName] = [pwshExe.exePath];
            }
        }
        catch (e_1_1) { e_1 = { error: e_1_1 }; }
        finally {
            try {
                if (_c && !_c.done && (_a = _b.return)) yield _a.call(_b);
            }
            finally { if (e_1) throw e_1.error; }
        }
        const promises = [];
        Object.keys(expectedLocations).forEach((key) => promises.push(validateShellPaths(key, expectedLocations[key])));
        const shells = yield Promise.all(promises);
        return shells.filter((e) => !!e);
    });
}
function detectAvailableUnixShells() {
    return __awaiter(this, void 0, void 0, function* () {
        const contents = yield readFile('/etc/shells', 'utf8');
        const shells = contents
            .split('\n')
            .filter((e) => e.trim().indexOf('#') !== 0 && e.trim().length > 0);
        return shells.map((e) => {
            return {
                label: basename(e),
                path: e
            };
        });
    });
}
function validateShellPaths(label, potentialPaths) {
    return __awaiter(this, void 0, void 0, function* () {
        if (potentialPaths.length === 0) {
            return Promise.resolve(undefined);
        }
        const current = potentialPaths.shift();
        if (current === '') {
            return validateShellPaths(label, potentialPaths);
        }
        try {
            const result = yield stat(normalize(current));
            if (result.isFile() || result.isSymbolicLink()) {
                return {
                    label,
                    path: current
                };
            }
        }
        catch (e) {
            // Also try using lstat as some symbolic links on Windows
            // throw 'permission denied' using 'stat' but don't throw
            // using 'lstat'
            try {
                const result = yield lstat(normalize(current));
                if (result.isFile() || result.isSymbolicLink()) {
                    return {
                        label,
                        path: current
                    };
                }
            }
            catch (e) {
                // noop
            }
        }
        return validateShellPaths(label, potentialPaths);
    });
}
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