Front matter: wire up RawContentParser + round-trip verification #3

Open
Open
Front matter: wire up RawContentParser + round-trip verification#3

Description

@roxspring
roxspring
opened on Aug 24, 2026

Switch from the planned custom Flexmark opaque front matter extension to commonmark-java's built-in YamlFrontMatterExtension with RawContentParser.

Background

commonmark-java's YamlFrontMatterExtension supports a RawContentParser mode that captures the entire front matter block as a single raw string, enabling verbatim round-trip through MarkdownRenderer. This replaces the originally planned custom Flexmark BlockParser / NodeFormatter extension.

Scope

  • Wire up YamlFrontMatterExtension.create(RawContentParser.Factory()) in MarkdownParser
  • Verify that YamlFrontMatterVisitor.readRawContent(document) returns the raw front matter string
  • Confirm round-trip: parse → render to Markdown → front matter is byte-for-byte identical
  • Confirm documents without front matter are unaffected

Acceptance criteria

  • A MarkdownDocument with front matter round-trips through MarkdownRenderer with no mutation to the front matter block
  • Documents without front matter are unaffected

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      , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
       blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

      Skip to content
      Front matter: wire up RawContentParser + round-trip verification #3
      Open
      Open
      Front matter: wire up RawContentParser + round-trip verification#3
      Description
      @roxspring
      roxspring
      opened on Aug 24, 2026
      Switch from the planned custom Flexmark opaque front matter extension to commonmark-java's built-in YamlFrontMatterExtension with RawContentParser.
      Background
      commonmark-java's YamlFrontMatterExtension supports a RawContentParser mode that captures the entire front matter block as a single raw string, enabling verbatim round-trip through MarkdownRenderer. This replaces the originally planned custom Flexmark BlockParser / NodeFormatter extension.
      Scope
      • Wire up YamlFrontMatterExtension.create(RawContentParser.Factory()) in MarkdownParser
      • Verify that YamlFrontMatterVisitor.readRawContent(document) returns the raw front matter string
      • Confirm round-trip: parse → render to Markdown → front matter is byte-for-byte identical
      • Confirm documents without front matter are unaffected
      Acceptance criteria
      • A MarkdownDocument with front matter round-trips through MarkdownRenderer with no mutation to the front matter block
      • Documents without front matter are unaffected
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        No labels
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          No milestone
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          None yet
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          No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

          Skip to content
          Front matter: wire up RawContentParser + round-trip verification #3
          Open
          Open
          Front matter: wire up RawContentParser + round-trip verification#3
          Description
          @roxspring
          roxspring
          opened on Aug 24, 2026
          Switch from the planned custom Flexmark opaque front matter extension to commonmark-java's built-in YamlFrontMatterExtension with RawContentParser.
          Background
          commonmark-java's YamlFrontMatterExtension supports a RawContentParser mode that captures the entire front matter block as a single raw string, enabling verbatim round-trip through MarkdownRenderer. This replaces the originally planned custom Flexmark BlockParser / NodeFormatter extension.
          Scope
          • Wire up YamlFrontMatterExtension.create(RawContentParser.Factory()) in MarkdownParser
          • Verify that YamlFrontMatterVisitor.readRawContent(document) returns the raw front matter string
          • Confirm round-trip: parse → render to Markdown → front matter is byte-for-byte identical
          • Confirm documents without front matter are unaffected
          Acceptance criteria
          • A MarkdownDocument with front matter round-trips through MarkdownRenderer with no mutation to the front matter block
          • Documents without front matter are unaffected
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            No labels
            No labels
            Projects
            No projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              Front matter: wire up RawContentParser + round-trip verification #3
              Open
              Open
              Front matter: wire up RawContentParser + round-trip verification#3
              Description
              @roxspring
              roxspring
              opened on Aug 24, 2026
              Switch from the planned custom Flexmark opaque front matter extension to commonmark-java's built-in YamlFrontMatterExtension with RawContentParser.
              Background
              commonmark-java's YamlFrontMatterExtension supports a RawContentParser mode that captures the entire front matter block as a single raw string, enabling verbatim round-trip through MarkdownRenderer. This replaces the originally planned custom Flexmark BlockParser / NodeFormatter extension.
              Scope
              • Wire up YamlFrontMatterExtension.create(RawContentParser.Factory()) in MarkdownParser
              • Verify that YamlFrontMatterVisitor.readRawContent(document) returns the raw front matter string
              • Confirm round-trip: parse → render to Markdown → front matter is byte-for-byte identical
              • Confirm documents without front matter are unaffected
              Acceptance criteria
              • A MarkdownDocument with front matter round-trips through MarkdownRenderer with no mutation to the front matter block
              • Documents without front matter are unaffected
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                No labels
                No labels
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

                  Skip to content
                  Front matter: wire up RawContentParser + round-trip verification #3
                  Open
                  Open
                  Front matter: wire up RawContentParser + round-trip verification#3
                  Description
                  @roxspring
                  roxspring
                  opened on Aug 24, 2026
                  Switch from the planned custom Flexmark opaque front matter extension to commonmark-java's built-in YamlFrontMatterExtension with RawContentParser.
                  Background
                  commonmark-java's YamlFrontMatterExtension supports a RawContentParser mode that captures the entire front matter block as a single raw string, enabling verbatim round-trip through MarkdownRenderer. This replaces the originally planned custom Flexmark BlockParser / NodeFormatter extension.
                  Scope
                  • Wire up YamlFrontMatterExtension.create(RawContentParser.Factory()) in MarkdownParser
                  • Verify that YamlFrontMatterVisitor.readRawContent(document) returns the raw front matter string
                  • Confirm round-trip: parse → render to Markdown → front matter is byte-for-byte identical
                  • Confirm documents without front matter are unaffected
                  Acceptance criteria
                  • A MarkdownDocument with front matter round-trips through MarkdownRenderer with no mutation to the front matter block
                  • Documents without front matter are unaffected
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    No labels
                    No labels
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                      Skip to content
                      Front matter: wire up RawContentParser + round-trip verification #3
                      Open
                      Open
                      Front matter: wire up RawContentParser + round-trip verification#3
                      Description
                      @roxspring
                      roxspring
                      opened on Aug 24, 2026
                      Switch from the planned custom Flexmark opaque front matter extension to commonmark-java's built-in YamlFrontMatterExtension with RawContentParser.
                      Background
                      commonmark-java's YamlFrontMatterExtension supports a RawContentParser mode that captures the entire front matter block as a single raw string, enabling verbatim round-trip through MarkdownRenderer. This replaces the originally planned custom Flexmark BlockParser / NodeFormatter extension.
                      Scope
                      • Wire up YamlFrontMatterExtension.create(RawContentParser.Factory()) in MarkdownParser
                      • Verify that YamlFrontMatterVisitor.readRawContent(document) returns the raw front matter string
                      • Confirm round-trip: parse → render to Markdown → front matter is byte-for-byte identical
                      • Confirm documents without front matter are unaffected
                      Acceptance criteria
                      • A MarkdownDocument with front matter round-trips through MarkdownRenderer with no mutation to the front matter block
                      • Documents without front matter are unaffected
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        No labels
                        No labels
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                          Skip to content
                          Front matter: wire up RawContentParser + round-trip verification #3
                          Open
                          Open
                          Front matter: wire up RawContentParser + round-trip verification#3
                          Description
                          @roxspring
                          roxspring
                          opened on Aug 24, 2026
                          Switch from the planned custom Flexmark opaque front matter extension to commonmark-java's built-in YamlFrontMatterExtension with RawContentParser.
                          Background
                          commonmark-java's YamlFrontMatterExtension supports a RawContentParser mode that captures the entire front matter block as a single raw string, enabling verbatim round-trip through MarkdownRenderer. This replaces the originally planned custom Flexmark BlockParser / NodeFormatter extension.
                          Scope
                          • Wire up YamlFrontMatterExtension.create(RawContentParser.Factory()) in MarkdownParser
                          • Verify that YamlFrontMatterVisitor.readRawContent(document) returns the raw front matter string
                          • Confirm round-trip: parse → render to Markdown → front matter is byte-for-byte identical
                          • Confirm documents without front matter are unaffected
                          Acceptance criteria
                          • A MarkdownDocument with front matter round-trips through MarkdownRenderer with no mutation to the front matter block
                          • Documents without front matter are unaffected
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            No labels
                            No labels
                            Projects
                            No projects
                              Milestone
                              No milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                              Skip to content
                              Front matter: wire up RawContentParser + round-trip verification #3
                              Open
                              Open
                              Front matter: wire up RawContentParser + round-trip verification#3
                              Description
                              @roxspring
                              roxspring
                              opened on Aug 24, 2026
                              Switch from the planned custom Flexmark opaque front matter extension to commonmark-java's built-in YamlFrontMatterExtension with RawContentParser.
                              Background
                              commonmark-java's YamlFrontMatterExtension supports a RawContentParser mode that captures the entire front matter block as a single raw string, enabling verbatim round-trip through MarkdownRenderer. This replaces the originally planned custom Flexmark BlockParser / NodeFormatter extension.
                              Scope
                              • Wire up YamlFrontMatterExtension.create(RawContentParser.Factory()) in MarkdownParser
                              • Verify that YamlFrontMatterVisitor.readRawContent(document) returns the raw front matter string
                              • Confirm round-trip: parse → render to Markdown → front matter is byte-for-byte identical
                              • Confirm documents without front matter are unaffected
                              Acceptance criteria
                              • A MarkdownDocument with front matter round-trips through MarkdownRenderer with no mutation to the front matter block
                              • Documents without front matter are unaffected
                              Metadata
                              Metadata
                              Assignees
                              No one assigned
                                Labels
                                No labels
                                No labels
                                Projects
                                No projects
                                  Milestone
                                  No milestone
                                  Relationships
                                  None yet
                                  Development
                                  No branches or pull requests
                                  Issue actions