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main.js
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main.js
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/*
* Copyright (c) 2012 Glenn Ruehle
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/*jslint vars: true, plusplus: true, devel: true, nomen: true, regexp: true, indent: 4, maxerr: 50 */
/*global define, brackets, $, window, PathUtils, marked */
define(function (require, exports, module) {
"use strict";
// Brackets modules
var AppInit = brackets.getModule("utils/AppInit"),
DocumentManager = brackets.getModule("document/DocumentManager"),
EditorManager = brackets.getModule("editor/EditorManager"),
ExtensionUtils = brackets.getModule("utils/ExtensionUtils"),
FileUtils = brackets.getModule("file/FileUtils"),
PanelManager = brackets.getModule("view/PanelManager"),
Resizer = brackets.getModule("utils/Resizer"),
StringUtils = brackets.getModule("utils/StringUtils");
// Local modules
var panelHTML = require("text!panel.html");
var marked = require("marked");
// jQuery objects
var $icon,
$iframe;
// Other vars
var currentDoc,
panel,
visible = false,
realVisibility = false;
function _loadDoc(doc, preserveScrollPos) {
if (doc && visible && $iframe) {
var docText = doc.getText(),
scrollPos = 0,
bodyText = "",
yamlRegEx = /^-{3}([\w\W]+?)(-{3})/,
yamlMatch = yamlRegEx.exec(docText);
// If there's yaml front matter, remove it.
if (yamlMatch) {
docText = docText.substr(yamlMatch[0].length);
}
if (preserveScrollPos) {
scrollPos = $iframe.contents()[0].body.scrollTop;
}
// Parse markdown into HTML
bodyText = marked(docText);
// Remove link hrefs
bodyText = bodyText.replace(/href=\"([^\"]*)\"/g, "title=\"$1\"");
// Make <base> tag for relative URLS
var baseUrl = window.location.protocol + "//" + FileUtils.getDirectoryPath(doc.file.fullPath);
// Assemble the HTML source
var htmlSource = "<html><head>";
htmlSource += "<base href='" + baseUrl + "'>";
htmlSource += "<link href='" + require.toUrl("./markdown.css") + "' rel='stylesheet'></link>";
htmlSource += "</head><body onload='document.body.scrollTop=" + scrollPos + "'>";
htmlSource += bodyText;
htmlSource += "</body></html>";
$iframe.attr("srcdoc", htmlSource);
}
}
var _timer;
function _documentChange(e) {
// "debounce" the page updates to avoid thrashing/flickering
// Note: this should use Async.whenIdle() once brackets/pull/5528
// is merged.
if (_timer) {
window.clearTimeout(_timer);
}
_timer = window.setTimeout(function () {
_timer = null;
_loadDoc(e.target, true);
}, 300);
}
function _resizeIframe() {
if (visible && $iframe) {
var iframeWidth = panel.$panel.innerWidth();
$iframe.attr("width", iframeWidth + "px");
}
}
function _setPanelVisibility(isVisible) {
if (isVisible === realVisibility) {
return;
}
realVisibility = isVisible;
if (isVisible) {
if (!panel) {
var $panel = $(panelHTML);
$iframe = $panel.find("#panel-markdown-preview-frame");
panel = PanelManager.createBottomPanel("markdown-preview-panel", $panel);
$panel.on("panelResizeUpdate", function (e, newSize) {
$iframe.attr("height", newSize);
});
$iframe.attr("height", $panel.height());
window.setTimeout(_resizeIframe);
}
_loadDoc(DocumentManager.getCurrentDocument());
$icon.toggleClass("active");
panel.show();
} else {
$icon.toggleClass("active");
panel.hide();
}
}
function _currentDocChangedHandler() {
var doc = DocumentManager.getCurrentDocument(),
ext = doc ? PathUtils.filenameExtension(doc.file.fullPath).toLowerCase() : "";
if (currentDoc) {
$(currentDoc).off("change", _documentChange);
currentDoc = null;
}
if (doc && /md|markdown|txt/.test(ext)) {
currentDoc = doc;
$(currentDoc).on("change", _documentChange);
$icon.css({display: "block"});
_setPanelVisibility(visible);
_loadDoc(doc);
} else {
$icon.css({display: "none"});
_setPanelVisibility(false);
}
}
function _toggleVisibility() {
visible = !visible;
_setPanelVisibility(visible);
}
// Set options for marked
marked.setOptions({
breaks: true // GFM style linebreak handling
});
// Insert CSS for this extension
ExtensionUtils.loadStyleSheet(module, "MarkdownPreview.css");
// Add toolbar icon
$icon = $("<a>")
.attr({
id: "markdown-preview-icon",
href: "#"
})
.css({
display: "none"
})
.click(_toggleVisibility)
.appendTo($("#main-toolbar .buttons"));
// Add a document change handler
$(DocumentManager).on("currentDocumentChange", _currentDocChangedHandler);
// currentDocumentChange is *not* called for the initial document. Use
// appReady() to set initial state.
AppInit.appReady(function () {
_currentDocChangedHandler();
});
// Listen for resize events
$(PanelManager).on("editorAreaResize", _resizeIframe);
$("#sidebar").on("panelCollapsed panelExpanded panelResizeUpdate", _resizeIframe);
});