Adding upstream version 9.0.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

8 files changed, 345 insertions, 0 deletions

diff --git a/web_src/js/markup/anchors.js b/web_src/js/markup/anchors.js
new file mode 100644
index 0000000..0e2c927
--- /dev/null
+++ b/web_src/js/markup/anchors.js
@@ -0,0 +1,70 @@
+import {svg} from '../svg.js';
+
+const addPrefix = (str) => `user-content-${str}`;
+const removePrefix = (str) => str.replace(/^user-content-/, '');
+const hasPrefix = (str) => str.startsWith('user-content-');
+
+// scroll to anchor while respecting the `user-content` prefix that exists on the target
+function scrollToAnchor(encodedId) {
+  if (!encodedId) return;
+  const id = decodeURIComponent(encodedId);
+  const prefixedId = addPrefix(id);
+  let el = document.getElementById(prefixedId);
+
+  // check for matching user-generated `a[name]`
+  if (!el) {
+    const nameAnchors = document.getElementsByName(prefixedId);
+    if (nameAnchors.length) {
+      el = nameAnchors[0];
+    }
+  }
+
+  // compat for links with old 'user-content-' prefixed hashes
+  if (!el && hasPrefix(id)) {
+    return document.getElementById(id)?.scrollIntoView();
+  }
+
+  el?.scrollIntoView();
+}
+
+export function initMarkupAnchors() {
+  const markupEls = document.querySelectorAll('.markup');
+  if (!markupEls.length) return;
+
+  for (const markupEl of markupEls) {
+    // create link icons for markup headings, the resulting link href will remove `user-content-`
+    for (const heading of markupEl.querySelectorAll('h1, h2, h3, h4, h5, h6')) {
+      const a = document.createElement('a');
+      a.classList.add('anchor');
+      a.setAttribute('href', `#${encodeURIComponent(removePrefix(heading.id))}`);
+      a.innerHTML = svg('octicon-link');
+      heading.prepend(a);
+    }
+
+    // remove `user-content-` prefix from links so they don't show in url bar when clicked
+    for (const a of markupEl.querySelectorAll('a[href^="#"]')) {
+      const href = a.getAttribute('href');
+      if (!href.startsWith('#user-content-')) continue;
+      a.setAttribute('href', `#${removePrefix(href.substring(1))}`);
+    }
+
+    // add `user-content-` prefix to user-generated `a[name]` link targets
+    // TODO: this prefix should be added in backend instead
+    for (const a of markupEl.querySelectorAll('a[name]')) {
+      const name = a.getAttribute('name');
+      if (!name) continue;
+      a.setAttribute('name', addPrefix(a.name));
+    }
+
+    for (const a of markupEl.querySelectorAll('a[href^="#"]')) {
+      a.addEventListener('click', (e) => {
+        scrollToAnchor(e.currentTarget.getAttribute('href')?.substring(1));
+      });
+    }
+  }
+
+  // scroll to anchor unless the browser has already scrolled somewhere during page load
+  if (!document.querySelector(':target')) {
+    scrollToAnchor(window.location.hash?.substring(1));
+  }
+}
diff --git a/web_src/js/markup/asciicast.js b/web_src/js/markup/asciicast.js
new file mode 100644
index 0000000..97b1874
--- /dev/null
+++ b/web_src/js/markup/asciicast.js
@@ -0,0 +1,17 @@
+export async function renderAsciicast() {
+  const els = document.querySelectorAll('.asciinema-player-container');
+  if (!els.length) return;
+
+  const [player] = await Promise.all([
+    import(/* webpackChunkName: "asciinema-player" */'asciinema-player'),
+    import(/* webpackChunkName: "asciinema-player" */'asciinema-player/dist/bundle/asciinema-player.css'),
+  ]);
+
+  for (const el of els) {
+    player.create(el.getAttribute('data-asciinema-player-src'), el, {
+      // poster (a preview frame) to display until the playback is started.
+      // Set it to 1 hour (also means the end if the video is shorter) to make the preview frame show more.
+      poster: 'npt:1:0:0',
+    });
+  }
+}
diff --git a/web_src/js/markup/codecopy.js b/web_src/js/markup/codecopy.js
new file mode 100644
index 0000000..078d741
--- /dev/null
+++ b/web_src/js/markup/codecopy.js
@@ -0,0 +1,21 @@
+import {svg} from '../svg.js';
+
+export function makeCodeCopyButton() {
+  const button = document.createElement('button');
+  button.classList.add('code-copy', 'ui', 'button');
+  button.innerHTML = svg('octicon-copy');
+  return button;
+}
+
+export function renderCodeCopy() {
+  const els = document.querySelectorAll('.markup .code-block code');
+  if (!els.length) return;
+
+  for (const el of els) {
+    if (!el.textContent) continue;
+    const btn = makeCodeCopyButton();
+    // remove final trailing newline introduced during HTML rendering
+    btn.setAttribute('data-clipboard-text', el.textContent.replace(/\r?\n$/, ''));
+    el.after(btn);
+  }
+}
diff --git a/web_src/js/markup/common.js b/web_src/js/markup/common.js
new file mode 100644
index 0000000..aff4a32
--- /dev/null
+++ b/web_src/js/markup/common.js
@@ -0,0 +1,8 @@
+export function displayError(el, err) {
+  el.classList.remove('is-loading');
+  const errorNode = document.createElement('pre');
+  errorNode.setAttribute('class', 'ui message error markup-block-error');
+  errorNode.textContent = err.str || err.message || String(err);
+  el.before(errorNode);
+  el.setAttribute('data-render-done', 'true');
+}
diff --git a/web_src/js/markup/content.js b/web_src/js/markup/content.js
new file mode 100644
index 0000000..1d29dc0
--- /dev/null
+++ b/web_src/js/markup/content.js
@@ -0,0 +1,18 @@
+import {renderMermaid} from './mermaid.js';
+import {renderMath} from './math.js';
+import {renderCodeCopy} from './codecopy.js';
+import {renderAsciicast} from './asciicast.js';
+import {initMarkupTasklist} from './tasklist.js';
+
+// code that runs for all markup content
+export function initMarkupContent() {
+  renderMermaid();
+  renderMath();
+  renderCodeCopy();
+  renderAsciicast();
+}
+
+// code that only runs for comments
+export function initCommentContent() {
+  initMarkupTasklist();
+}
diff --git a/web_src/js/markup/math.js b/web_src/js/markup/math.js
new file mode 100644
index 0000000..872e50a
--- /dev/null
+++ b/web_src/js/markup/math.js
@@ -0,0 +1,47 @@
+import {displayError} from './common.js';
+
+function targetElement(el) {
+  // The target element is either the current element if it has the
+  // `is-loading` class or the pre that contains it
+  return el.classList.contains('is-loading') ? el : el.closest('pre');
+}
+
+export async function renderMath() {
+  const els = document.querySelectorAll('.markup code.language-math');
+  if (!els.length) return;
+
+  const [{default: katex}] = await Promise.all([
+    import(/* webpackChunkName: "katex" */'katex'),
+    import(/* webpackChunkName: "katex" */'katex/dist/katex.css'),
+  ]);
+
+  const MAX_CHARS = 1000;
+  const MAX_SIZE = 25;
+  const MAX_EXPAND = 1000;
+
+  for (const el of els) {
+    const target = targetElement(el);
+    if (target.hasAttribute('data-render-done')) continue;
+    const source = el.textContent;
+
+    if (source.length > MAX_CHARS) {
+      displayError(target, new Error(`Math source of ${source.length} characters exceeds the maximum allowed length of ${MAX_CHARS}.`));
+      continue;
+    }
+
+    const displayMode = el.classList.contains('display');
+    const nodeName = displayMode ? 'p' : 'span';
+
+    try {
+      const tempEl = document.createElement(nodeName);
+      katex.render(source, tempEl, {
+        maxSize: MAX_SIZE,
+        maxExpand: MAX_EXPAND,
+        displayMode,
+      });
+      target.replaceWith(tempEl);
+    } catch (error) {
+      displayError(target, error);
+    }
+  }
+}
diff --git a/web_src/js/markup/mermaid.js b/web_src/js/markup/mermaid.js
new file mode 100644
index 0000000..0549fb3
--- /dev/null
+++ b/web_src/js/markup/mermaid.js
@@ -0,0 +1,74 @@
+import {isDarkTheme} from '../utils.js';
+import {makeCodeCopyButton} from './codecopy.js';
+import {displayError} from './common.js';
+
+const {mermaidMaxSourceCharacters} = window.config;
+
+// margin removal is for https://github.com/mermaid-js/mermaid/issues/4907
+const iframeCss = `:root {color-scheme: normal}
+body {margin: 0; padding: 0; overflow: hidden}
+#mermaid {display: block; margin: 0 auto}
+blockquote, dd, dl, figure, h1, h2, h3, h4, h5, h6, hr, p, pre {margin: 0}`;
+
+export async function renderMermaid() {
+  const els = document.querySelectorAll('.markup code.language-mermaid');
+  if (!els.length) return;
+
+  const {default: mermaid} = await import(/* webpackChunkName: "mermaid" */'mermaid');
+
+  mermaid.initialize({
+    startOnLoad: false,
+    theme: isDarkTheme() ? 'dark' : 'neutral',
+    securityLevel: 'strict',
+  });
+
+  for (const el of els) {
+    const pre = el.closest('pre');
+    if (pre.hasAttribute('data-render-done')) continue;
+
+    const source = el.textContent;
+    if (mermaidMaxSourceCharacters >= 0 && source.length > mermaidMaxSourceCharacters) {
+      displayError(pre, new Error(`Mermaid source of ${source.length} characters exceeds the maximum allowed length of ${mermaidMaxSourceCharacters}.`));
+      continue;
+    }
+
+    try {
+      await mermaid.parse(source);
+    } catch (err) {
+      displayError(pre, err);
+      continue;
+    }
+
+    try {
+      // can't use bindFunctions here because we can't cross the iframe boundary. This
+      // means js-based interactions won't work but they aren't intended to work either
+      const {svg} = await mermaid.render('mermaid', source);
+
+      const iframe = document.createElement('iframe');
+      iframe.classList.add('markup-render', 'tw-invisible');
+      iframe.srcdoc = `<html><head><style>${iframeCss}</style></head><body>${svg}</body></html>`;
+
+      const mermaidBlock = document.createElement('div');
+      mermaidBlock.classList.add('mermaid-block', 'is-loading', 'tw-hidden');
+      mermaidBlock.append(iframe);
+
+      const btn = makeCodeCopyButton();
+      btn.setAttribute('data-clipboard-text', source);
+      mermaidBlock.append(btn);
+
+      iframe.addEventListener('load', () => {
+        pre.replaceWith(mermaidBlock);
+        mermaidBlock.classList.remove('tw-hidden');
+        iframe.style.height = `${iframe.contentWindow.document.body.clientHeight}px`;
+        setTimeout(() => { // avoid flash of iframe background
+          mermaidBlock.classList.remove('is-loading');
+          iframe.classList.remove('tw-invisible');
+        }, 0);
+      });
+
+      document.body.append(mermaidBlock);
+    } catch (err) {
+      displayError(pre, err);
+    }
+  }
+}
diff --git a/web_src/js/markup/tasklist.js b/web_src/js/markup/tasklist.js
new file mode 100644
index 0000000..375810d
--- /dev/null
+++ b/web_src/js/markup/tasklist.js
@@ -0,0 +1,90 @@
+import {POST} from '../modules/fetch.js';
+import {showErrorToast} from '../modules/toast.js';
+
+const preventListener = (e) => e.preventDefault();
+
+/**
+ * Attaches `input` handlers to markdown rendered tasklist checkboxes in comments.
+ *
+ * When a checkbox value changes, the corresponding [ ] or [x] in the markdown string
+ * is set accordingly and sent to the server. On success it updates the raw-content on
+ * error it resets the checkbox to its original value.
+ */
+export function initMarkupTasklist() {
+  for (const el of document.querySelectorAll(`.markup[data-can-edit=true]`) || []) {
+    const container = el.parentNode;
+    const checkboxes = el.querySelectorAll(`.task-list-item input[type=checkbox]`);
+
+    for (const checkbox of checkboxes) {
+      if (checkbox.hasAttribute('data-editable')) {
+        return;
+      }
+
+      checkbox.setAttribute('data-editable', 'true');
+      checkbox.addEventListener('input', async () => {
+        const checkboxCharacter = checkbox.checked ? 'x' : ' ';
+        const position = parseInt(checkbox.getAttribute('data-source-position')) + 1;
+
+        const rawContent = container.querySelector('.raw-content');
+        const oldContent = rawContent.textContent;
+
+        const encoder = new TextEncoder();
+        const buffer = encoder.encode(oldContent);
+        // Indexes may fall off the ends and return undefined.
+        if (buffer[position - 1] !== '['.codePointAt(0) ||
+          buffer[position] !== ' '.codePointAt(0) && buffer[position] !== 'x'.codePointAt(0) && buffer[position] !== 'X'.codePointAt(0) ||
+          buffer[position + 1] !== ']'.codePointAt(0)) {
+          // Position is probably wrong.  Revert and don't allow change.
+          checkbox.checked = !checkbox.checked;
+          throw new Error(`Expected position to be space, x or X and surrounded by brackets, but it's not: position=${position}`);
+        }
+        buffer.set(encoder.encode(checkboxCharacter), position);
+        const newContent = new TextDecoder().decode(buffer);
+
+        if (newContent === oldContent) {
+          return;
+        }
+
+        // Prevent further inputs until the request is done. This does not use the
+        // `disabled` attribute because it causes the border to flash on click.
+        for (const checkbox of checkboxes) {
+          checkbox.addEventListener('click', preventListener);
+        }
+
+        try {
+          const editContentZone = container.querySelector('.edit-content-zone');
+          const updateUrl = editContentZone.getAttribute('data-update-url');
+          const context = editContentZone.getAttribute('data-context');
+          const contentVersion = editContentZone.getAttribute('data-content-version');
+
+          const requestBody = new FormData();
+          requestBody.append('ignore_attachments', 'true');
+          requestBody.append('content', newContent);
+          requestBody.append('context', context);
+          requestBody.append('content_version', contentVersion);
+          const response = await POST(updateUrl, {data: requestBody});
+          const data = await response.json();
+          if (response.status === 400) {
+            showErrorToast(data.errorMessage);
+            return;
+          }
+          editContentZone.setAttribute('data-content-version', data.contentVersion);
+          rawContent.textContent = newContent;
+        } catch (err) {
+          checkbox.checked = !checkbox.checked;
+          console.error(err);
+        }
+
+        // Enable input on checkboxes again
+        for (const checkbox of checkboxes) {
+          checkbox.removeEventListener('click', preventListener);
+        }
+      });
+    }
+
+    // Enable the checkboxes as they are initially disabled by the markdown renderer
+    for (const checkbox of checkboxes) {
+      checkbox.disabled = false;
+    }
+  }
+}