ws-filewatcher/src/Index.bs.js

Ws-Filewatcher is a cli that will watch for file change and open a websocket server where it will send a message everytime the file is updated

// Generated by BUCKLESCRIPT, PLEASE EDIT WITH CARE
'use strict';

var Fs = require("fs");
var Ws = require("ws");
var Path = require("path");
var Curry = require("bs-platform/lib/js/curry.js");
var Chalk = require("chalk");
var Yargs = require("yargs");
var Printf = require("bs-platform/lib/js/printf.js");
var Child_process = require("child_process");
var Caml_exceptions = require("bs-platform/lib/js/caml_exceptions.js");

var NotFound = Caml_exceptions.create("Index.NotFound");

var match = Yargs.usage("Usage: $0 <path-to-file> [options]").alias("f", "file").nargs("f", 1).option("port", {
              description: "Set the port of the WebSocket server",
              alias: "p",
              type_: "number"
            }).option("command", {
            description: "Run the command on every file update",
            alias: "c",
            type_: "string"
          }).option("verbose", {
          description: "Allow logging",
          alias: "v",
          type_: "boolean"
        }).demandOption(["f"]).default({
      port: 9999
    }).argv;

var command = match.command;

var file = match.file;

var port = match.port;

var fileToWatch;

if (file === "") {
  console.log(Chalk.red("You must pass a path to the file to watch"));
  throw {
        RE_EXN_ID: NotFound,
        Error: new Error()
      };
}

fileToWatch = Path.resolve(file);

var verbose = match.verbose !== undefined;

var fileWatcher = Fs.watchFile(fileToWatch, {
      interval: 300
    }, (function (param, param$1) {
        
      }));

var wss = new Ws.Server({
      port: port
    });

if (verbose) {
  console.log(Chalk.green(Curry._2(Printf.sprintf(/* Format */{
                    _0: {
                      TAG: /* String_literal */11,
                      _0: "> Server is watching '",
                      _1: {
                        TAG: /* String */2,
                        _0: /* No_padding */0,
                        _1: {
                          TAG: /* String_literal */11,
                          _0: "' and is starting on port '",
                          _1: {
                            TAG: /* Int */4,
                            _0: /* Int_i */3,
                            _1: /* No_padding */0,
                            _2: /* No_precision */0,
                            _3: {
                              TAG: /* String_literal */11,
                              _0: "' \n",
                              _1: /* End_of_format */0
                            }
                          }
                        }
                      }
                    },
                    _1: "> Server is watching '%s' and is starting on port '%i' \n"
                  }), fileToWatch, port)));
}

wss.on("connection", (function (ws) {
        var fsCb = function (param) {
          if (verbose) {
            console.log(Chalk.green("> The file was updated -> Sending an update to socket"));
          }
          if (command !== undefined) {
            Child_process.exec(command);
          }
          ws.send("update");
          
        };
        if (verbose) {
          console.log(Chalk.green("> A socket is connected"));
        }
        fileWatcher.on("change", fsCb);
        ws.on("close", (function (param) {
                if (verbose) {
                  console.log(Chalk.green("> A socket disconnected"));
                }
                fileWatcher.off("change", fsCb);
                
              }));
        
      }));

exports.NotFound = NotFound;
exports.port = port;
exports.file = file;
exports.command = command;
exports.fileToWatch = fileToWatch;
exports.verbose = verbose;
exports.fileWatcher = fileWatcher;
exports.wss = wss;
/* match Not a pure module */