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index.js
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index.js
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'use strict';
var execFile = require('child_process').execFile;
var inRange = require('in-range');
var Promise = require('pinkie-promise');
var pify = require('pify');
var parse = require('json-promise').parse;
function getBrightness(str) {
return new Promise(function (resolve, reject) {
var regex = new RegExp('"brightness"={(.*?)}');
str = regex.exec(str);
if (!str) {
reject(new Error('This display is not supported'));
}
return parse(JSON.parse(str[0].substring(str[0].indexOf('{'), str[0].lastIndexOf('}') + 1).replace(/\=/g, ':'))).then(function (res) {
resolve(res.value / res.max);
});
});
}
exports.get = function () {
if (process.platform !== 'darwin') {
return Promise.reject(new Error('Only OS X systems are supported'));
}
var cmd = 'ioreg';
var args = [
'-c',
'AppleBacklightDisplay',
'-r',
'-d',
1
];
return pify(execFile, Promise)(cmd, args).then(function (stdout) {
if (stdout) {
return getBrightness(stdout);
}
args[1] = 'AppleDisplay';
return pify(execFile, Promise)(cmd, args).then(function (stdout) {
if (!stdout) {
return Promise.reject(new Error('This display is not supported'));
}
return getBrightness(stdout);
});
});
};
exports.set = function (val) {
if (process.platform !== 'darwin') {
return Promise.reject(new Error('Only OS X systems are supported'));
}
if (typeof val !== 'number' || isNaN(val)) {
return Promise.reject(new TypeError('Expected a number'));
}
if (!inRange(val, 1)) {
return Promise.reject(new Error('Expected a value between 0 and 1'));
}
return pify(execFile, Promise)('./main', [val], {cwd: __dirname});
};