switch to node.js

index.js

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+#!/usr/bin/env node
+const exec = require('child_process').exec;
+const argv = require('minimist')(process.argv.slice(2));
+const xrandrParse = require('xrandr-parse');
+
+if (argv.help || argv.h) {
+    console.log(
+`swm - a helper to switch connected monitors
+
+usage: swm [monitor1 [monitor2]...] [--postCmd "<some commmand>"]
+
+If monitor is not passed it turns on all connected devices
+and lays them out next to each other in the order detected.
+
+monitor: The string as reported by the script. If provided only
+this monitor will be turned on.`
+    );
+
+    return;
+}
+
+const monitorsSelected = argv._;
+
+function getDevices() {
+    return new Promise((resolve, reject) => {
+        exec('xrandr', (err, stdout, stderr) => {
+            if (err || stderr) {
+                reject(err);
+                return;
+            }
+            resolve(xrandrParse(stdout));
+        });
+    });
+}
+
+function getDeviceStatus(deviceKey, device) {
+    if (monitorsSelected.indexOf(deviceKey) > -1 && device.connected) {
+        return '--auto';
+    }
+    return '--off';
+}
+
+function genXrandrOptions(devices) {
+    var xrandrOptions = '';
+
+    Object.keys(devices).forEach(deviceKey => {
+        const device = devices[deviceKey];
+        const deviceStatus = getDeviceStatus(deviceKey, device);
+        xrandrOptions += ['', '--output', deviceKey, deviceStatus].join(' ');
+    });
+
+    return xrandrOptions;
+}
+
+function switchDevices(xrandrOptions) {
+    return new Promise((resolve, reject) => {
+        const cmd = 'xrandr ' + xrandrOptions;
+        exec(cmd, (err, stdout, stderr) => {
+            if (err || stderr) {
+                reject(err);
+                return;
+            }
+            resolve();
+        });
+    });
+}
+
+function executePostCmd() {
+    if (!argv.postCmd) {
+        return;
+    }
+    return new Promise((resolve, reject) => {
+        exec(argv.postCmd, (err, stdout, stderr) => {
+            if (err || stderr) {
+                reject(err);
+                return;
+            }
+            resolve();
+        });
+    });
+}
+
+getDevices()
+    .then(genXrandrOptions)
+    .then(switchDevices)
+    .then(executePostCmd)
+    .catch(err => {
+        console.error(err);
+    });