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main.js
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main.js
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chrome.commands.onCommand.addListener(function(command) {
console.log("help");
var headerExtension = "h";
var implementationExtensions = [ "m", "mm", "c", "cpp" ];
chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
var current = tabs[0];
var url = current.url;
var ext = url.substring(url.lastIndexOf(".") + 1);
if(ext === headerExtension)
{
existingSourceFileForHeaderURL(url, implementationExtensions, function (sourceURL) {
if(sourceURL)
{
chrome.tabs.update(current.id, { url: sourceURL });
}
});
}
else if(implementationExtensions.indexOf(ext) >= 0)
{
var headerURL = replaceExtension(url, headerExtension);
chrome.tabs.update(current.id, { url: headerURL });
}
});
});
function doesURLExist(url, resultCallback) {
var http = new XMLHttpRequest();
http.open('HEAD', url);
http.onreadystatechange = function() {
if (this.readyState == this.DONE) {
resultCallback(this.status != 404);
}
};
http.send();
}
function replaceExtension(url, newExt) {
var withoutExt = url.substring(0, url.lastIndexOf(".") + 1);
return withoutExt + newExt;
}
function existingSourceFileForHeaderURL(url, extensions, callback) {
if(extensions.length > 0)
{
var nextExtensions = extensions;
var currentExt = nextExtensions.shift();
var currentExtURL = replaceExtension(url, currentExt);
doesURLExist(currentExtURL, function (exists) {
if(exists)
{
callback(currentExtURL);
}
else
{
existingSourceFileForHeaderURL(url, nextExtensions, callback);
}
});
}
else
{
callback(null);
}
}