just-build/dist/which-local.js

A simple task runner that doesn't bloat your package

var path = require('path');
var fs = require('fs');
var ref = require('./dirutils');
var getPackageRoot = ref.getPackageRoot;
var getBinLocation = ref.getBinLocation;
var ref$1 = require('./tokenize');
var tokenize = ref$1.tokenize;
var surroundWithQuotes = ref$1.surroundWithQuotes;
var debug = require('./debug');

function whichLocal (cmd, cwd) {
    debug.log(("whichLocal(" + (JSON.stringify(cwd)) + ", " + (JSON.stringify(cmd)) + ")"));
    var binScript = getBinLocation(cwd, cmd);
    debug.log(("binScript = " + (JSON.stringify(binScript))));
    if (!binScript) { return null; }
    var binDir = path.dirname (binScript);
    debug.log(("binDir = " + (JSON.stringify(binDir))));
    var node_modules = path.normalize(path.resolve(binDir, ".."));
    debug.log(("node_modules = " + (JSON.stringify(node_modules))));

    if (!fs.existsSync(binScript)) { return null; }

    var scriptLines = fs.readFileSync(binScript, "utf-8").split('\n');
    if (scriptLines.length === 0) { return null; }
    var shebang = scriptLines[0].trim();
    debug.log(("shebang = " + shebang));
    if (shebang[0] != "#") { return null; }
    if (shebang.indexOf("bin/sh") === -1) {
        // Not a shellscript (cygwin starter)
        if (scriptLines[0].indexOf(' node') !== -1) {
            // A node script by itself
            debug.log("A node script by itself");
            return path.normalize(binScript);
        }
        debug.log("whichLocal return null since bin/sh not found in shebang.");
        return null;
    }
    var invokerLines = scriptLines.filter(function (line) { return line.indexOf('node ') !== -1; });
    debug.log(("invokerLines = " + (JSON.stringify(invokerLines))));
    // Expected to find: `  node  "$basedir/../uglify-js/bin/uglifyjs" "$@"`
    if (invokerLines.length < 1) { return null; }
    var tokenized = tokenize(invokerLines[0]);
    // Expected: "node", "$basedir/../uglify-js/bin/uglifyjs", "$@" or
    //           "exec", "node", "$basedir/../typescript/bin/tsc", "$@" or
    //           "exec", "$basedir/node", "$basedir/../typescript/bin/tsc". "$@""
    if (tokenized.length < 3) { return null; }
    var binFilePath = tokenized.find(function (part) { return part !== 'exec' &&
        part !== 'node' &&
        !part.endsWith('/node'); }
    );
    var splitted = binFilePath.split('/');
    while (splitted.length > 0 && (
        splitted[0].indexOf('$') === 0 || // $basedir
        //splitted[0] === '..' || // ".."
        splitted[0] === '.')) // just for optional future changes
    {
        splitted = splitted.slice(1);
    }

    var jsScriptPath = path.normalize(path.resolve(binDir, splitted.join('/')));
    debug.log(("jsScriptPath = " + (JSON.stringify(jsScriptPath))));
    if (splitted.length === 0) { return null; }
    
    return jsScriptPath;
}

module.exports = { whichLocal: whichLocal };