130 lines
4.0 KiB
JavaScript
130 lines
4.0 KiB
JavaScript
/*\
|
|
title: $:/plugins/tiddlywiki/browser-storage/startup.js
|
|
type: application/javascript
|
|
module-type: startup
|
|
|
|
Startup initialisation
|
|
|
|
\*/
|
|
(function(){
|
|
|
|
/*jslint node: true, browser: true */
|
|
/*global $tw: false */
|
|
"use strict";
|
|
|
|
// Export name and synchronous status
|
|
exports.name = "browser-storage";
|
|
exports.platforms = ["browser"];
|
|
exports.after = ["startup"];
|
|
exports.synchronous = true;
|
|
|
|
var ENABLED_TITLE = "$:/config/BrowserStorage/Enabled",
|
|
SAVE_FILTER_TITLE = "$:/config/BrowserStorage/SaveFilter",
|
|
QUOTA_EXCEEDED_ALERT_TITLE = "$:/config/BrowserStorage/QuotaExceededAlert",
|
|
DEFAULT_QUOTA_EXCEEDED_ALERT_PREFIX = "Quota exceeded attempting to store `",
|
|
DEFAULT_QUOTA_EXCEEDED_ALERT_SUFFIX = "` in browser local storage";
|
|
|
|
exports.startup = function() {
|
|
var self = this;
|
|
// Compute our prefix for local storage keys
|
|
var prefix = "tw5#" + window.location.pathname + "#";
|
|
// Make a logger
|
|
var logger = new $tw.utils.Logger("browser-storage",{
|
|
colour: "cyan"
|
|
});
|
|
// Function to compile the filter
|
|
var filterFn,
|
|
compileFilter = function() {
|
|
filterFn = $tw.wiki.compileFilter($tw.wiki.getTiddlerText(SAVE_FILTER_TITLE));
|
|
}
|
|
compileFilter();
|
|
// Listen for tm-clear-browser-storage messages
|
|
$tw.rootWidget.addEventListener("tm-clear-browser-storage",function(event) {
|
|
$tw.wiki.addTiddler({title: ENABLED_TITLE, text: "no"});
|
|
clearLocalStorage();
|
|
});
|
|
// Track tiddler changes
|
|
$tw.wiki.addEventListener("change",function(changes) {
|
|
// Bail if browser storage is disabled
|
|
if($tw.wiki.getTiddlerText(ENABLED_TITLE) === "no") {
|
|
return;
|
|
}
|
|
// Recompile the filter if it has changed
|
|
if(changes[SAVE_FILTER_TITLE]) {
|
|
compileFilter();
|
|
}
|
|
// Filter the changes
|
|
var filteredChanges = filterFn.call($tw.wiki,function(iterator) {
|
|
$tw.utils.each(changes,function(change,title) {
|
|
var tiddler = $tw.wiki.getTiddler(title);
|
|
iterator(tiddler,title);
|
|
});
|
|
});
|
|
$tw.utils.each(filteredChanges,function(title) {
|
|
// Don't try to save changes to our enabled status
|
|
// (If it were enabled in the file but disabled in local storage then we might not realise that distributing a copy of the file would have local storage enabled for other users)
|
|
if(title === ENABLED_TITLE) {
|
|
return;
|
|
}
|
|
// Save the tiddler
|
|
saveTiddlerToLocalStorage(title,{
|
|
logger: logger,
|
|
prefix: prefix
|
|
});
|
|
});
|
|
});
|
|
};
|
|
|
|
function saveTiddlerToLocalStorage(title,options) {
|
|
options = options || {};
|
|
// Get the tiddler
|
|
var tiddler = $tw.wiki.getTiddler(title);
|
|
if(tiddler) {
|
|
console.log("browser-storage: Saving",title);
|
|
// Get the JSON of the tiddler
|
|
var json = JSON.stringify(tiddler.getFieldStrings());
|
|
// Try to save it to local storage
|
|
try {
|
|
window.localStorage.setItem(options.prefix + title,json);
|
|
} catch(e) {
|
|
if(e.name === "QuotaExceededError") {
|
|
// Complain if we failed
|
|
var msg = $tw.wiki.getTiddlerText(QUOTA_EXCEEDED_ALERT_TITLE,DEFAULT_QUOTA_EXCEEDED_ALERT_PREFIX + title + DEFAULT_QUOTA_EXCEEDED_ALERT_SUFFIX);
|
|
if(options.logger) {
|
|
options.logger.alert(msg);
|
|
}
|
|
// No point in keeping old values around for this tiddler
|
|
window.localStorage.removeItem(options.prefix + title);
|
|
} else {
|
|
console.log("Browser-storage error:",e);
|
|
}
|
|
}
|
|
} else {
|
|
// In local storage, use the special value of empty string to mark the tiddler as deleted
|
|
// On future page loads, if the tiddler is already gone from startup then the blank entry
|
|
// will be removed from localstorage. Otherwise, the tiddler will be deleted.
|
|
console.log("browser-storage: Blanking",title);
|
|
try {
|
|
window.localStorage.setItem(options.prefix + title, "");
|
|
} catch(e) {
|
|
console.log("Browser-storage error:",e);
|
|
}
|
|
}
|
|
}
|
|
|
|
function clearLocalStorage() {
|
|
var url = window.location.pathname,
|
|
log = [];
|
|
// Step through each browsder storage item
|
|
for(var index=window.localStorage.length - 1; index>=0; index--) {
|
|
var key = window.localStorage.key(index),
|
|
parts = key.split("#");
|
|
// Delete it if it's ours
|
|
if(parts[0] === "tw5" && parts[1] === url) {
|
|
window.localStorage.removeItem(key);
|
|
}
|
|
}
|
|
}
|
|
|
|
})();
|