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+/*
+ * ==VimperatorPlugin==
+ * @name            imageextender.js
+ * @description     extend image operation.
+ * @description-ja  画像操作特集。
+ * @author          janus_wel <janus_wel@fb3.so-net.ne.jp>
+ * @version         0.10
+ * @minversion      2.0pre
+ * @maxversion      2.0pre
+ * ==/VimperatorPlugin==
+ *
+ * LICENSE
+ *  New BSD License
+ *
+ * USAGE
+ *  extended-hints mode ':m' to yank image URL and
+ *  ';i' to save image are available.
+ *  there are default setting.
+ *  you can change there by below settings.
+ *
+ *  command ':downimageall' is also available.
+ *  it is to download all images of current page,
+ *  but it effects heavy load to the server,
+ *  you must use carefully.
+ *  we are NOT RESPONSIBLE for result of this command.
+ *
+ * SETTING
+ *  image_extender_yank_key:    key name to yank image URL.
+ *                              default is 'm'.
+ *  image_extender_save_key:    key name to save image.
+ *                              default is 'i'.
+ *  image_extender_skip_prompt: if set 'true', skip prompt to locate and name.
+ *                              the reflection of this setting is dynamic.
+ *                              ':downimageall' command ignore this setting.
+ *                              default is 'false'
+ *
+ * EXAMPLE
+ *  in .vimperatorrc
+ *
+ *      image_extender_yank_key='g'
+ *      image_extender_save_key='e'
+ *      image_skip_prompt='true'
+ *
+ *  in this settings, ';g' start extended-hints mode to yank image URL.
+ *  ';e' start it to save image. prompt is not displayed at save operation.
+ *
+ * */
+
+( function () {
+
+// default settings
+const yankKey = liberator.globalVariables.image_extender_yank_key || 'm';
+const saveKey = liberator.globalVariables.image_extender_save_key || 'i';
+
+// common settings
+const query = '//img[@src and not(starts-with(@src, "data:"))]';
+const interval = 200; // 5 images per second
+
+// extended-hints mode
+// to yank image URL
+hints.addMode(
+    yankKey,
+    'Yank image URL',
+    function (element) util.copyToClipboard(element.src, true),
+    function () query
+);
+// to save image
+hints.addMode(
+    saveKey,
+    'Save image',
+    function (element) {
+        let skipPrompt = stringToBoolean(liberator.globalVariables.image_extender_skip_prompt, false);
+
+        try       { saveImage(element, skipPrompt); }
+        catch (e) { liberator.echoerr(e); }
+    },
+    function () query
+);
+commands.addUserCommand(
+    ['downimageall'],
+    'download all images of current page',
+    function () {
+        // refer: http://d.hatena.ne.jp/amachang/20071108/1194501306
+        let images = buffer.evaluateXPath(query);
+        let l = images.snapshotLength;
+        let i = 0;
+        setTimeout ( function a() {
+            if (!(i < l)) return;
+            try       { saveImage(images.snapshotItem(i), true); }
+            catch (e) { liberator.echoerr(e); }
+            ++i;
+            setTimeout(a, interval);
+        }, interval);
+    },
+    {}
+);
+
+// stuff function
+function stringToBoolean(str, defaultValue) {
+    return !str                          ? (defaultValue ? true : false)
+         : str.toLowerCase() === 'false' ? false
+         : /^\d+$/.test(str)             ? (parseInt(str) ? true : false)
+         :                                 true;
+}
+
+function saveImage(imgElement, skipPrompt) {
+    let doc = imgElement.ownerDocument;
+    let url = imgElement.src;
+    let filename = url.split(/\//g);
+    filename = filename[filename.length - 1];
+
+    urlSecurityCheck(url, doc.nodePrincipal);
+    // we always want to save that link relative to the current working directory
+    options.setPref("browser.download.lastDir", io.getCurrentDirectory().path);
+    saveImageURL(url, filename, null, true, skipPrompt, makeURI(url, doc.characterSet));
+}
+} )();
+
+// vim: sw=4 sts=4 ts=4 et