/* Console History by RL Vision
* https://github.com/rlv-dan */
(function () {
if (console && console.log) { // Make sure the console object is available
console.historyData = [];
// Restore previous session (if there is one)
// The sessionStorage object is a convenient choice because the browser automatically clears it for us.
var currentSessionStorage = [];
if(sessionStorage && sessionStorage.consoleHistory) {
currentSessionStorage = JSON.parse(sessionStorage.consoleHistory);
}
// Keep a reference to the original console functions that we intend to overwrite
window.originalConsole = {
// Assigning a native function to a var could throw TypeError, thus we need to use bind
log: console.log.bind(console),
info: console.info.bind(console),
warn: console.warn.bind(console),
error: console.error.bind(console),
}
// Function to save console calls in our history data objects
var makeHistory = function(type, args) {
args= Array.prototype.slice.call(args);
console.historyData.push( { "type": type, "output": args, "timestamp": new Date() } );
if(sessionStorage) {
currentSessionStorage.push( { "type": type, "output": args, "timestamp": new Date() } );
sessionStorage.consoleHistory = JSON.stringify(currentSessionStorage);
}
}
// Override console functions with out own implementations
// These will first record the call arguments and then pass the call on to the real console object
console.log = function() {
makeHistory("log", arguments);
return originalConsole.log.apply(this, arguments);
}
console.info = function() {
makeHistory("info", arguments);
return originalConsole.info.apply(this, arguments);
}
console.warn = function() {
makeHistory("warn", arguments);
return originalConsole.warn.apply(this, arguments);
}
console.error = function() {
makeHistory("error", arguments);
return originalConsole.error.apply(this, arguments);
}
// Recall history by calling console.history()
// Argument entireSession determines if recalling since beginning of current page load or since beginning of the current session
console.history = function( entireSession ) {
// Select data source
var source = console.historyData;
if(entireSession && sessionStorage && sessionStorage.consoleHistory) {
source = JSON.parse(sessionStorage.consoleHistory);
}
// Print history
for(var n=0; n<source.length; n++) {
switch(source[n].type) {
case "log":
originalConsole.log.apply(null, source[n].output);
break;
case "info":
originalConsole.info.apply(null, source[n].output);
break;
case "warn":
originalConsole.warn.apply(null, source[n].output);
break;
case "error":
originalConsole.error.apply(null, source[n].output);
break;
}
}
}
}
})(); // Initialize using an Immediately-Invoked Function Expression (IIFE)
