Initial skeleton version of the core wmii config node.js module.

wmii.1.js

// wmii core Module
// Adam R. Nelson
// August 2013

var wmiir  = require('./wmiir.js');
var events = require('./wmii_events.js');
var keys   = require('./wmii_keys.js');
var dialog = require('./dialog.js');
var spawn  = require('child_process').spawn;

var actions = {};
var programs = [];

function indexPrograms() {
    try {
        var proglist = "";
        var child = spawn('wmiir', ['proglist'].concat(process.env.PATH.split(':')));
        child.stdout.on('data', function(chunk) {
            proglist += chunk;
        });
        child.on('exit', function() {
            programs = proglist.split('\n');
        });
    } catch (e) {
        dialog.error('Failed to index programs: ' + e.message);
    }
}

// Executes a shell command string.
function execString(cmdStr) {
    wmiir.setsid('sh', '-c', cmdStr);
}

exports.events = events;
exports.keys   = keys;

// Trigger preconfigured actions with the "Action" event.
events.on('Action', function(action) {
    var handler = actions[action];
    if (handler) handler.apply(this, Array.prototype.slice.call(arguments, 1));
    else events.emit('Error', 'No such action: ' + action);
});

// This flag is used to prevent infinite loops from spawning too many error
// messages. Only one error message may be on screen at a time.
var errorMessageVisible = false;

// Display an error message when the "Error" event occurs.
events.on('Error', function(/* varargs */) {
    var message = Array.prototype.slice.apply(arguments).join(' '); 
    console.log('Error occurred!');
    console.log(message);
    if (!errorMessageVisible) {
        errorMessageVisible = true;
        dialog.error(message, {title: 'wmii error'}, function() {
            errorMessageVisible = false;
        });
    }
});

// Displays a wimenu, containing the items in the array `items` and displaying
// the prompt `prompt`, and, once the user selects an item, calls `callback`
// with the selected item as the first argument.
function menu(items, prompt, callback) {
    var child = spawn('wimenu', ['-p', prompt]);
    child.on('error', function(err) {
        events.emit('Error', err.message || err);
    });
    var stdout = "";
    child.stdout.on('data', function(chunk) {
        stdout += chunk.toString();
    });
    child.on('exit', function(code) {
        if (code === 0 && callback)
            callback(stdout);
    });
    child.stdin.end(items.sort().join('\n'));
    return child;
}
exports.menu = menu;

// Defines a new action, with the name `name` and the callback function
// `action`. This action will be listed in the actions menu.
exports.defineAction = function(name, action) {
    actions[name] = action;
};

// Displays the actions menu.
exports.actionsMenu = function() {
    menu(Object.keys(actions), 'Action>', function(action) {
        events.emit('Action', action);
    });
};

// Displays a menu of all executable programs in the user's PATH, and executes
// whatever command is entered into the menu.
exports.programsMenu = function() {
    menu(programs, 'Run>', function(command) {
        execString(command);
    });
};

// Index the programs menu before starting wmii.
indexPrograms();