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config: added ability to subscribe to changes

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This commit is contained in:
Guillermo Rauch 2016-07-07 08:16:48 -07:00
parent 318f684da4
commit 24f1ae657e
1 changed files with 31 additions and 7 deletions
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38
config.js
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@ -1,4 +1,4 @@
// const { ipcMain } = require('electron'); const { dialog } = require('electron');
const { homedir } = require('os'); const { homedir } = require('os');
const { resolve } = require('path'); const { resolve } = require('path');
const { readFileSync, writeFileSync } = require('fs'); const { readFileSync, writeFileSync } = require('fs');
@ -6,29 +6,53 @@ const gaze = require('gaze');
const vm = require('vm'); const vm = require('vm');
const path = resolve(homedir(), '.hyperterm.js'); const path = resolve(homedir(), '.hyperterm.js');
const watchers = [];
let cfg = {}; let cfg = {};
function watch () { function watch () {
gaze(path, () => { gaze(path, function (err) {
console.log('a change happened'); if (err) throw err;
this.on('changed', () => {
try {
if (exec(readFileSync(path, 'utf8'))) {
watchers.forEach((fn) => fn());
}
} catch (err) {
dialog.showMessageBox({
message: `An error occurred loading your configuration (${path}): ${err.message}`,
buttons: ['Ok']
});
}
});
}); });
} }
let _str; // last script
function exec (str) { function exec (str) {
if (str === _str) return false;
_str = str;
const script = new vm.Script(str); const script = new vm.Script(str);
const module = {}; const module = {};
script.runInNewContext({ module }); script.runInNewContext({ module });
const cfg = module.exports.config;
if (!module.exports) { if (!module.exports) {
throw new Error('Error reading configuration: `module.exports` not set'); throw new Error('Error reading configuration: `module.exports` not set');
} }
if (!cfg) { const _cfg = module.exports.config;
if (!_cfg) {
throw new Error('Error reading configuration: `config` key is missing'); throw new Error('Error reading configuration: `config` key is missing');
} }
return cfg; cfg = _cfg;
return true;
} }
exports.subscribe = function (fn) {
watchers.push(fn);
return () => {
watchers.splice(watchers.indexOf(fn), 1);
};
};
exports.init = function () { exports.init = function () {
try { try {
exec(readFileSync(path, 'utf8')); exec(readFileSync(path, 'utf8'));
@ -37,7 +61,7 @@ exports.init = function () {
const defaultConfig = readFileSync(resolve(__dirname, 'config-default.js')); const defaultConfig = readFileSync(resolve(__dirname, 'config-default.js'));
try { try {
console.log('attempting to write default config to', path); console.log('attempting to write default config to', path);
cfg = exec(defaultConfig); exec(defaultConfig);
writeFileSync(path, defaultConfig); writeFileSync(path, defaultConfig);
} catch (err) { } catch (err) {
throw new Error(`Failed to write config to ${path}`); throw new Error(`Failed to write config to ${path}`);