fable-compiler-netcore/watch.js

F# to JavaScript compiler

"use strict";
var path = require("path");
var chokidar = require("chokidar");
var fableLib = require("./lib");
var bundle_1 = require("./bundle");
function tooClose(opts, filename, prev) {
    var d = new Date();
    return opts.watching !== "BUILDING" &&
        prev != null &&
        filename == prev[0] &&
        new Date().getTime() - prev[1].getTime() < 2000;
}
/** Watches for file changes. Requires chokidar */
function watch(opts, buildResult, fableProc, parallelProc, continuation) {
    if (opts.watching) {
        if (buildResult === "NEEDS_FULL_REBUILD") {
            fableLib.stdoutLog("Triggering full rebuild...");
            fableProc.stdin.write("[SIGFAIL]\n");
        }
        else {
            // Reset opts.watching
            opts.watching = "WATCHING";
        }
        return;
    }
    var next = null, prev = null;
    fableProc.stdin.setEncoding("utf-8");
    var dirs = null;
    if (typeof opts.watch === "string") {
        dirs = [fableLib.pathJoin(opts.workingDir, opts.watch)];
    }
    else if (Array.isArray(opts.watch) && opts.watch.length > 0) {
        dirs = opts.watch.map(function (dir) { return fableLib.pathJoin(opts.workingDir, dir); });
    }
    else {
        dirs = opts.projFile.map(function (dir) { return path.dirname(fableLib.pathJoin(opts.workingDir, dir)); });
    }
    fableLib.stdoutLog("Watching " + dirs.join('\n\t'));
    fableLib.stdoutLog("Press Enter to terminate process.");
    opts.watching = "WATCHING";
    var ready = false;
    var watcher = chokidar
        .watch(dirs, { ignored: /node_modules/, persistent: true })
        .on("ready", function () { ready = true; })
        .on("all", function (ev, filePath) {
        if (ready) {
            if (fableLib.isFSharpFile(filePath)) {
                prev = next;
                next = [filePath, new Date()];
                if (!tooClose(opts, filePath, prev)) {
                    fableLib.stdoutLog(ev + ": " + filePath + " at " + next[1].toLocaleTimeString());
                    opts.watching = "BUILDING";
                    fableProc.stdin.write(filePath + "\n");
                }
            }
        }
    });
    process.stdin.on('data', function (buf) {
        var data = buf.toString();
        if (data.length > 0 && data[data.length - 1] == '\n') {
            if (parallelProc) {
                parallelProc.kill();
            }
            fableProc.stdin.write("[SIGTERM]\n");
            watcher.close();
            bundle_1.clearBundleCache(); // Clean bundle cache just in case
            fableLib.stdoutLog("Process terminated.");
            fableLib.finish(0, continuation);
        }
    });
}
exports.watch = watch;