User:Quarl/diffsince.js

// User:Quarl/diffsince.js - utility functions for doing a "diff since I

// last edited"

// depends: wikipage.js, util.js

// Synopsis:

// url = diffsince.makeUrl(wikiPage);

// href = 'diff since';

// Or:

// url = diffsince.makeUrl(wp);

// href = 'diff since';

// Navigating to the value of makeUrl will open a history page, parse it, and

// jump to the appropriate diff.

// The diffPageAsync() function asynchronously downloads the history page and

// then navigates to the diff. It is appropriate as an onClick handler.

// The diffThis() function does the diff directly if already looking at a

// history page, else calls diffPageAsync(wikiPage).

// diffPageAsync and diffThis take status_node and status_text parameters for

// showing progress.

// quarl 2006-01-16 (asynchronous code originally written in show_diff_since.js)

// quarl 2006-02-03 factored as library

//

var diffsince = new Object();
diffsince.historyLimit = [200];
// return a URL that points to a "fakeaction" page for doing a diff.
diffsince.makeUrl = function(wp) {
return wp.qurl + '&fakeaction=diffsince&action=history&limit='+diffsince.historyLimit[0];
}
diffsince._load = function() {
if (WikiPage.queryVars.fakeaction == 'diffsince') {
diffsince._parseHistory(document);
}
}
diffsince.diffPageAsync = function(wp, statusNode, statusText) {
var url = wp.qurl + '&action=history&limit='+diffsince.historyLimit[0];
var req = new XMLHttpRequest();
// change the button to show the user we're doing something and
// prevent another click
buttonShowStatus(statusNode, statusText); // (statusNode, statusText are optional)
asyncDownloadXML(url, diffsince._handleHistoryPage,
{ statusNode: statusNode });
return false;
}
diffsince.diffThis = function(statusNode, statusText) {
if (wikiDoc.historyP) {
// already looking at a history page
diffsince._parseHistory(document);
} else {
// not yet a history page -- asynchronously download it first
diffsince.diffPageAsync(wikiPage, statusNode, statusText);
}
return false;
}
diffsince._handleHistoryPage = function(req) {
// restore button in case this fails, so user can click again
buttonRestoreStatus(req.statusNode);
if (req.status == 200) {
diffsince._parseHistory(req.responseXML);
} else {
alert("Error downloading history page!");
}
}
diffsince._parseHistory = function(doc) {
if (!doc) { alert ("## no doc?!"); return; }
var hists = doc.getElementById("pagehistory").childNodes;
if (!hists) { alert("Couldn't parse history from page"); return; }
for (n=0;n
// window.username is defined in wikipage.js
if (hists[n].getElementsByTagName &&
hists[n].getElementsByTagName("span")[0].textContent==wikiDoc.username)
{
document.location = hists[n].childNodes[1].href;
return;
}
}
alert("diffsince: Couldn't find your entry in the history page; you haven't edited recently!");
// TODO: retry with a larger limit
}
$(diffsince._load);
//