add support for predefined profiles

cli.js

@@ -5,6 +5,7 @@ const argv = require('minimist')(process.argv.slice(2));
 const swm = require('./swm.js');
 const config = require('./config.js');
 const postCmd = argv.postCmd || config.postCmd;
+const profile = argv.profile || argv.p;
 
 if (argv.help || argv.h) {
     console.log(
@@ -41,8 +42,10 @@ the form of
     process.exit(2);
 }
 
+const devices = swm.getDevices();
+
 if (argv.list || argv.l) {
-    swm.getDevices()
+    devices
         .then(devices => {
             console.log('Detected devices:\n');
             Object.keys(devices)
@@ -51,8 +54,21 @@ if (argv.list || argv.l) {
             process.exit(0);
         });
 } else {
-    swm.getDevices()
+    let selectedMonitors = argv._;
-        .then(swm.generateXrandrOptions.bind(null, argv._))
+
+    if (profile) {
+        if (!config.profiles[profile]) {
+            console.error('profile', profile, 'not found in config');
+            process.exit(1);
+        }
+        selectedMonitors = config.profiles[profile];
+        console.log('Using profile', profile);
+    }
+
+    console.log('Switching on', selectedMonitors);
+
+    devices
+        .then(swm.generateXrandrOptions.bind(null, selectedMonitors))
         .then(swm.switchDevices)
         .then(swm.executePostCmd.bind(null, postCmd))
         .catch(err => {

config.js

@@ -4,6 +4,7 @@ const configPath = require('xdg').basedir.configPath('switchmon/config.json');
 
 const defaults = {
     postCmd: undefined,
+    profiles: {},
 };
 
 let config = Object.assign({}, defaults);

swm.js

@@ -34,9 +34,19 @@ function orderDeviceKeys(selectedDevices, devices) {
 
 function setActivationFlag(selectedDevices, devices) {
     const result = {};
+
     Object.keys(devices).forEach(deviceKey => {
         const device = Object.assign({}, devices[deviceKey]);
-        device.activate = device.connected && (!selectedDevices.length || selectedDevices.indexOf(deviceKey) > -1 );
+        const isSelected = !selectedDevices.length || selectedDevices.indexOf(deviceKey) > -1;
+
+        if (isSelected) {
+            if (device.connected) {
+                device.activate = true;
+            } else {
+                console.error(deviceKey, 'not connected. Skipping...');
+            }
+        }
+
         result[deviceKey] = device;
     });
     return result;