153 lines
No EOL
3.7 KiB
JavaScript
153 lines
No EOL
3.7 KiB
JavaScript
define([
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"util/manos"
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], function(M) {
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/*
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The File object provides storage backed by the local HDD via the chrome.fileSystem API.
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*/
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var noop = function() {};
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var File = function(entry) {
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this.entry = entry || null;
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this.onWrite = noop;
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};
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File.prototype = {
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open: function(mode, c) {
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var self = this;
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if (typeof mode == "function") {
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c = mode;
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mode = "open";
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}
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//mode is "open" or "save"
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var modes = {
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"open": "openWritableFile",
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"save": "saveFile"
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};
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chrome.fileSystem.chooseEntry({
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type: modes[mode]
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}, function(entry) {
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//cancelling acts like an error, but isn't.
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if (!entry) return c(chrome.runtime.lastError);
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self.entry = entry;
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c(null, self);
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});
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},
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read: function(c) {
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var self = this;
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if (!self.entry) {
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console.error(self);
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c("File not opened");
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}
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var reader = new FileReader();
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reader.onload = function() {
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c(null, reader.result);
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};
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reader.onerror = function(err) {
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console.error("File read error!");
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c(err);
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};
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self.entry.file(function(f) {
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reader.readAsText(f);
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});
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},
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write: function(data, c) {
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var self = this;
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c = c || function() {};
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if (!self.entry) {
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//guard against cases where we accidentally write before opening
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return self.open("save").then(function() {
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return self.write(data, c);
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});
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}
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M.chain(
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//check permissions
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function(next) {
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chrome.fileSystem.isWritableEntry(self.entry, next);
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},
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//if read-only, try to open as writable
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function(ok, next) {
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if (!ok) {
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return chrome.fileSystem.getWritableEntry(self.entry, function(entry) {
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if (entry) {
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self.entry = entry;
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next();
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} else {
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c("Couldn't open file as writable");
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}
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});
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}
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next();
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},
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//write file
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function() {
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self.entry.createWriter(function(writer) {
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writer.onerror = function(err) {
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console.error(err);
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c(err);
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}
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writer.onwriteend = function() {
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//after truncation, actually write the file
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writer.onwriteend = function() {
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c();
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self.onWrite();
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}
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var blob = new Blob([data]);
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writer.write(blob);
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};
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writer.truncate(0);
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});
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}
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);
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},
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stat: function(c) {
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var self = this;
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if (self.entry) {
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return self.entry.file(function(f) {
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c(null, f);
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});
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}
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c("No file entry");
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},
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retain: function() {
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return chrome.fileSystem.retainEntry(this.entry);
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},
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restore: function(id, c) {
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var self = this;
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chrome.fileSystem.isRestorable(id, function(is) {
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if (is) {
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chrome.fileSystem.restoreEntry(id, function(entry) {
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if (!entry) return c("restoreEntry() failed for " + id);
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self.entry = entry;
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c();
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});
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} else {
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c("isRestorable() returned false for " + id);
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}
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});
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},
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getPath: function(c) {
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var self = this;
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if (!self.entry) return fail("No backing entry, cannot get path");
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chrome.fileSystem.getDisplayPath(self.entry, function(path) {
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c(null, path);
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});
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}
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};
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return File;
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}); |