zwitterion/main.js

Static development file server for TypeScript, built with NGINX and Node.js.

#!/usr/bin/env node

// start side-causes, read from the world
const fs = require('fs');
const program = require('commander');
const http = require('http');
const execSync = require('child_process').execSync;
const execAsync = require('child_process').exec;
const tsc = require('typescript');
const path = require('path');
const WebSocket = require('ws');
const chokidar = require('chokidar');

program
    .version('0.12.8')
    .option('-p, --port [port]', 'Specify the server\'s port')
    .option('-r, --spa-root [spaRoot]', 'The file to redirect to when a requested file is not found')
    .option('-w, --watch-files', 'Watch files in current directory and reload browser on changes')
    .option('--ts-warning', 'Report TypeScript errors in the browser console as warnings')
    .option('--ts-error', 'Report TypeScript errors in the browser console as errors')
    .option('--build-static', 'Create a static build of the current working directory. The output will be in a directory called dist in the current working directory')
    // .option('--output-dir', 'The output directory for ') //TODO allow the static build to go to any output directory specified by the user
    .parse(process.argv);
// end side-causes

// start pure operations, generate the data

const buildStatic = program.buildStatic;
const watchFiles = program.watchFiles;
const spaRoot = program.spaRoot || 'index.html';
const nodePort = +(program.port || 5000);
const webSocketPort = nodePort + 1;
const tsWarning = program.tsWarning;
const tsError = program.tsError;
const nodeHttpServer = createNodeServer(http, nodePort, webSocketPort, watchFiles, tsWarning, tsError);
const webSocketServer = createWebSocketServer(webSocketPort, watchFiles);
let clients = {};
let compiledFiles = {};

//end pure operations

// start side-effects, change the world

nodeHttpServer.listen(nodePort);
console.log(`Zwitterion listening on port ${nodePort}`);

if (buildStatic) {
    const asyncExec = execAsync(`
        echo "Copy current working directory to ZWITTERION_TEMP directory"

        originalDirectory=$(pwd)

        rm -rf dist
        cd ..
        rm -rf ZWITTERION_TEMP
        cp -r $originalDirectory ZWITTERION_TEMP
        cd ZWITTERION_TEMP

        echo "Download and save all .html files from Zwitterion"

        shopt -s globstar
        for file in **/*.html; do
            wget -q -x -nH "http://localhost:${nodePort}/$file"
        done

        echo "Download and save all .ts files from Zwitterion"

        shopt -s globstar
        for file in **/*.ts; do
            wget -q -x -nH "http://localhost:${nodePort}/$\{file%.*\}.js"
        done

        echo "Copy ZWITTERION_TEMP to dist directory in the project root directory"

        cd ..
        cp -r ZWITTERION_TEMP $originalDirectory/dist
        rm -rf ZWITTERION_TEMP

        echo "Static build finished"
    `, {
        shell: '/bin/bash'
    }, () => {
        process.exit();
    });

    asyncExec.stdout.pipe(process.stdout);
    asyncExec.stderr.pipe(process.stderr);

    return;
}

// end side-effects

function createNodeServer(http, nodePort, webSocketPort, watchFiles, tsWarning, tsError) {
    return http.createServer((req, res) => {
        const normalizedReqUrl = req.url === '/' ? '/index.html' : req.url;
        const filePathWithDot = normalizedReqUrl.slice(0, normalizedReqUrl.lastIndexOf('.') + 1);
        const fileExtensionWithoutDot = normalizedReqUrl.slice(normalizedReqUrl.lastIndexOf('.') + 1);
        const directoryPath = normalizedReqUrl.slice(0, normalizedReqUrl.lastIndexOf('/')) || '/';

        switch (fileExtensionWithoutDot) {
            case 'html': {
                if (fs.existsSync(`.${normalizedReqUrl}`)) {
                    watchFile(`.${normalizedReqUrl}`, watchFiles);
                    const fileText = fs.readFileSync(`.${normalizedReqUrl}`).toString();
                    res.end(getTsReplacedText(fileText, directoryPath, watchFiles, webSocketPort));
                    return;
                }
                else {
                    res.end(getTsReplacedText(fs.readFileSync(`./index.html`).toString(), directoryPath, watchFiles, webSocketPort));
                    return;
                }
            }
            case 'js': {
                if (compiledFiles[`.${filePathWithDot}ts`]) {
                    res.end(compiledFiles[`.${filePathWithDot}ts`]);
                    return;
                }
                else if (fs.existsSync(`.${filePathWithDot}ts`)) {
                    const typeScriptErrorsString = getTypeScriptErrorsString(`.${filePathWithDot}ts`, tsWarning, tsError);
                    watchFile(`.${filePathWithDot}ts`, watchFiles);
                    const compiledTs = compileTsToJs(fs.readFileSync(`.${filePathWithDot}ts`).toString());
                    const compiledTsWithErrorsString = `${compiledTs}${typeScriptErrorsString}`;
                    compiledFiles[`.${filePathWithDot}ts`] = compiledTsWithErrorsString;
                    res.end(compiledTsWithErrorsString);
                    return;
                }
                else {
                    if (fs.existsSync(`.${normalizedReqUrl}`)) {
                        watchFile(`.${normalizedReqUrl}`, watchFiles);
                        res.end(fs.readFileSync(`.${normalizedReqUrl}`).toString());
                        return;
                    }
                    else {
                        res.end(getTsReplacedText(fs.readFileSync(`./index.html`).toString(), directoryPath, watchFiles, webSocketPort));
                        return;
                    }
                }
            }
            default: {
                if (fs.existsSync(`.${normalizedReqUrl}`)) {
                    watchFile(`.${normalizedReqUrl}`, watchFiles);
                    res.end(fs.readFileSync(`.${normalizedReqUrl}`));
                    return;
                }
                else {
                    res.end(getTsReplacedText(fs.readFileSync(`./index.html`).toString(), directoryPath, watchFiles, webSocketPort));
                    return;
                }
            }
        }
    });
}

function getTypeScriptErrorsString(filePath, tsWarning, tsError) {
    if (tsWarning || tsError) {
        const tsProgram = tsc.createProgram([
            filePath
        ], {});
        const semanticDiagnostics = tsProgram.getSemanticDiagnostics();
        return semanticDiagnostics.reduce((result, diagnostic) => {
            return `${result}\nconsole.${tsWarning ? 'warn' : 'error'}("TypeScript: ${diagnostic.file.fileName}: ${diagnostic.messageText}")`;
        }, '');
    }
    else {
        return '';
    }
}

function watchFile(filePath, watchFiles) {
    if (watchFiles) {
        chokidar.watch(filePath).on('change', () => {
            compiledFiles[filePath] = null;
            Object.values(clients).forEach((client) => {
                client.send('RELOAD_MESSAGE');
            });
        });
    }
}

function getTsReplacedText(originalText, directoryPath, watchFiles, webSocketPort) {
    const text = originalText.includes('<head>') && watchFiles ? originalText.replace('<head>', `<head>
        MIT License
        -----------

        Copyright (C) 2013-2016 Guy Bedford

        Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

        The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

        THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
         * SystemJS v0.20.17 Dev
         */
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