/
screenlog.js
174 lines (153 loc) · 4.58 KB
/
screenlog.js
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(function() {
var logEl,
isInitialized = false,
_console = {}; // backup console obj to contain references of overridden fns.
_options = {
bgColor: "black",
logColor: "lightgreen",
infoColor: "blue",
warnColor: "orange",
errorColor: "red",
fontSize: "1em",
freeConsole: false,
css: "",
autoScroll: true
};
function createElement(tag, css) {
var element = document.createElement(tag);
element.style.cssText = css;
return element;
}
function createPanel() {
var div = createElement(
"div",
"z-index:2147483647;font-family:Helvetica,Arial,sans-serif;font-size:" +
_options.fontSize +
";padding:5px;text-align:left;opacity:0.8;position:fixed;right:0;top:0;min-width:200px;max-height:50vh;overflow:auto;background:" +
_options.bgColor +
";" +
_options.css
);
return div;
}
function genericLogger(color) {
return function() {
var el = createElement(
"div",
"line-height:1.7em;min-height:1.7em;background:" +
(logEl.children.length % 2 ? "rgba(255,255,255,0.1)" : "") +
";color:" +
color
); // zebra lines
var val = [].slice.call(arguments).reduce(function(prev, arg) {
return (
prev + " " + (typeof arg === "object" ? JSON.stringify(arg) : arg)
);
}, "");
el.textContent = val;
logEl.appendChild(el);
// Scroll to last element, if autoScroll option is set.
if (_options.autoScroll) {
logEl.scrollTop = logEl.scrollHeight - logEl.clientHeight;
}
};
}
function clear() {
logEl.innerHTML = "";
}
function log() {
return genericLogger(_options.logColor).apply(null, arguments);
}
function info() {
return genericLogger(_options.infoColor).apply(null, arguments);
}
function warn() {
return genericLogger(_options.warnColor).apply(null, arguments);
}
function error() {
return genericLogger(_options.errorColor).apply(null, arguments);
}
function setOptions(options) {
for (var i in options)
if (options.hasOwnProperty(i) && _options.hasOwnProperty(i)) {
_options[i] = options[i];
}
}
function init(options) {
if (isInitialized) {
return;
}
isInitialized = true;
if (options) {
setOptions(options);
}
logEl = createPanel();
document.body.appendChild(logEl);
if (!_options.freeConsole) {
// Backup actual fns to keep it working together
_console.log = console.log;
_console.clear = console.clear;
_console.info = console.info;
_console.warn = console.warn;
_console.error = console.error;
console.log = originalFnCallDecorator(log, "log");
console.clear = originalFnCallDecorator(clear, "clear");
console.info = originalFnCallDecorator(info, "info");
console.warn = originalFnCallDecorator(warn, "warn");
console.error = originalFnCallDecorator(error, "error");
}
}
function destroy() {
isInitialized = false;
console.log = _console.log;
console.clear = _console.clear;
console.info = _console.info;
console.warn = _console.warn;
console.error = _console.error;
logEl.remove();
}
/**
* Checking if isInitialized is set
*/
function checkInitialized() {
if (!isInitialized) {
throw "You need to call `screenLog.init()` first.";
}
}
/**
* Decorator for checking if isInitialized is set
* @param {Function} fn Fn to decorate
* @return {Function} Decorated fn.
*/
function checkInitDecorator(fn) {
return function() {
checkInitialized();
return fn.apply(this, arguments);
};
}
/**
* Decorator for calling the original console's fn at the end of
* our overridden fn definitions.
* @param {Function} fn Fn to decorate
* @param {string} fn Name of original function
* @return {Function} Decorated fn.
*/
function originalFnCallDecorator(fn, fnName) {
return function() {
fn.apply(this, arguments);
if (typeof _console[fnName] === "function") {
_console[fnName].apply(console, arguments);
}
};
}
// Public API
window.screenLog = {
init: init,
log: originalFnCallDecorator(checkInitDecorator(log), "log"),
clear: originalFnCallDecorator(checkInitDecorator(clear), "clear"),
info: originalFnCallDecorator(checkInitDecorator(clear), "info"),
warn: originalFnCallDecorator(checkInitDecorator(warn), "warn"),
error: originalFnCallDecorator(checkInitDecorator(error), "error"),
destroy: checkInitDecorator(destroy)
};
})();