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/**

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* @class elFinder command "empty".

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* Empty the folder

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* @type elFinder.command

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* @author Naoki Sawada

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elFinder.prototype.commands.empty = function() {

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"use strict";

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var self, fm,

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selFiles = function(select) {

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var sel = self.files(select);

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if (!sel.length) {

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sel = [ fm.cwd() ];

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}

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return sel;

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};

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this.linkedCmds = ['rm'];

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this.init = function() {

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// lazy assign to make possible to become superclass

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self = this;

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fm = this.fm;

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};

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this.getstate = function(select) {

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var sel = selFiles(select),

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cnt,

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filter = function(files) {

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var fres = true;

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return jQuery.grep(files, function(f) {

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fres = fres && f.read && f.write && f.mime === 'directory' ? true : false;

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return fres;

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});

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};

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cnt = sel.length;

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return filter(sel).length == cnt ? 0 : -1;

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};

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this.exec = function(hashes) {

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var dirs = selFiles(hashes),

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cnt = dirs.length,

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dfrd = jQuery.Deferred()

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.done(function() {

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var data = {changed: {}};

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fm.toast({msg: fm.i18n(['"'+success.join('", ')+'"', 'complete', fm.i18n('cmdempty')])});

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jQuery.each(dirs, function(i, dir) {

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data.changed[dir.hash] = dir;

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});

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fm.change(data);

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})

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.always(function() {

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var cwd = fm.cwd().hash;

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fm.trigger('selectfiles', {files: jQuery.map(dirs, function(d) { return cwd === d.phash? d.hash : null; })});

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}),

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success = [],

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done = function(res) {

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if (typeof res === 'number') {

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success.push(dirs[res].name);

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delete dirs[res].dirs;

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} else {

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res && fm.error(res);

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}

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(--cnt < 1) && dfrd[success.length? 'resolve' : 'reject']();

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};

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jQuery.each(dirs, function(i, dir) {

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var tm;

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if (!(dir.write && dir.mime === 'directory')) {

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done(['errEmpty', dir.name, 'errPerm']);

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return null;

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}

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if (!fm.isCommandEnabled('rm', dir.hash)) {

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done(['errCmdNoSupport', '"rm"']);

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return null;

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}

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tm = setTimeout(function() {

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fm.notify({type : 'search', cnt : 1, hideCnt : cnt > 1? false : true});

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}, fm.notifyDelay);

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fm.request({

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data : {cmd : 'open', target : dir.hash},

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preventDefault : true,

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asNotOpen : true

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}).done(function(data) {

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var targets = [];

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tm && clearTimeout(tm);

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if (fm.ui.notify.children('.elfinder-notify-search').length) {

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fm.notify({type : 'search', cnt : -1, hideCnt : cnt > 1? false : true});

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}

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if (data && data.files && data.files.length) {

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if (data.files.length > fm.maxTargets) {

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done(['errEmpty', dir.name, 'errMaxTargets', fm.maxTargets]);

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} else {

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fm.updateCache(data);

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jQuery.each(data.files, function(i, f) {

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if (!f.write || f.locked) {

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done(['errEmpty', dir.name, 'errRm', f.name, 'errPerm']);

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targets = [];

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return false;

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}

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targets.push(f.hash);

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});

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if (targets.length) {

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fm.exec('rm', targets, { _userAction : true, addTexts : [ fm.i18n('folderToEmpty', dir.name) ] })

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.fail(function(error) {

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fm.trigger('unselectfiles', {files: fm.selected()});

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done(fm.parseError(error) || '');

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})

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.done(function() { done(i); });

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}

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}

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} else {

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fm.toast({ mode: 'warning', msg: fm.i18n('filderIsEmpty', dir.name)});

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done('');

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}

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}).fail(function(error) {

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done(fm.parseError(error) || '');

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});

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});

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return dfrd;

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};

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};

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