Markdown to HTML Converter

Converts Markdown files to beautifully styled HTML with inline CSS, optimized for WeChat Official Account and other platforms.

Script Directory

Agent Execution: Determine this SKILL.md directory as {baseDir}. Resolve ${BUN_X} runtime: if bun installed → bun; if npx available → npx -y bun; else suggest installing bun. Replace {baseDir} and ${BUN_X} with actual values.

Script	Purpose
scripts/main.ts	Main entry point

Preferences (EXTEND.md)

Check EXTEND.md existence (priority order):

# macOS, Linux, WSL, Git Bash
test -f .baoyu-skills/baoyu-markdown-to-html/EXTEND.md && echo "project"
test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-markdown-to-html/EXTEND.md" && echo "xdg"
test -f "$HOME/.baoyu-skills/baoyu-markdown-to-html/EXTEND.md" && echo "user"

# PowerShell (Windows)
if (Test-Path .baoyu-skills/baoyu-markdown-to-html/EXTEND.md) { "project" }
$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
if (Test-Path "$xdg/baoyu-skills/baoyu-markdown-to-html/EXTEND.md") { "xdg" }
if (Test-Path "$HOME/.baoyu-skills/baoyu-markdown-to-html/EXTEND.md") { "user" }

┌──────────────────────────────────────────────────────────────┬───────────────────┐ │ Path │ Location │ ├──────────────────────────────────────────────────────────────┼───────────────────┤ │ .baoyu-skills/baoyu-markdown-to-html/EXTEND.md │ Project directory │ ├──────────────────────────────────────────────────────────────┼───────────────────┤ │ $HOME/.baoyu-skills/baoyu-markdown-to-html/EXTEND.md │ User home │ └──────────────────────────────────────────────────────────────┴───────────────────┘

┌───────────┬───────────────────────────────────────────────────────────────────────────┐ │ Result │ Action │ ├───────────┼───────────────────────────────────────────────────────────────────────────┤ │ Found │ Read, parse, apply settings │ ├───────────┼───────────────────────────────────────────────────────────────────────────┤ │ Not found │ Use defaults │ └───────────┴───────────────────────────────────────────────────────────────────────────┘

EXTEND.md Supports: Default theme | Custom CSS variables | Code block style

Workflow

Step 0: Pre-check (Chinese Content)

Condition: Only execute if input file contains Chinese text.

Detection:

1. Read input markdown file
2. Check if content contains CJK characters (Chinese/Japanese/Korean)
3. If no CJK content → skip to Step 1

Format Suggestion:

If CJK content detected AND baoyu-format-markdown skill is available:

Use AskUserQuestion to ask whether to format first. Formatting can fix:

• Bold markers with punctuation inside causing ** parse failures
• CJK/English spacing issues

If user agrees: Invoke baoyu-format-markdown skill to format the file, then use formatted file as input.

If user declines: Continue with original file.

Step 1: Determine Theme

Theme resolution order (first match wins):

1. User explicitly specified theme (CLI --theme or conversation)
2. EXTEND.md default_theme (this skill's own EXTEND.md, checked in Step 0)
3. baoyu-post-to-wechat EXTEND.md default_theme (cross-skill fallback)
4. If none found → use AskUserQuestion to confirm

Cross-skill EXTEND.md check (only if this skill's EXTEND.md has no default_theme):

# Check baoyu-post-to-wechat EXTEND.md for default_theme
test -f "$HOME/.baoyu-skills/baoyu-post-to-wechat/EXTEND.md" && grep -o 'default_theme:.*' "$HOME/.baoyu-skills/baoyu-post-to-wechat/EXTEND.md"

# PowerShell (Windows)
if (Test-Path "$HOME/.baoyu-skills/baoyu-post-to-wechat/EXTEND.md") { Select-String -Pattern 'default_theme:.*' -Path "$HOME/.baoyu-skills/baoyu-post-to-wechat/EXTEND.md" | ForEach-Object { $_.Matches.Value } }

If theme is resolved from EXTEND.md: Use it directly, do NOT ask the user.

If no default found: Use AskUserQuestion to confirm:

Theme	Description
default (Recommended)	Classic - traditional layout, centered title with bottom border, H2 with white text on colored background
grace	Elegant - text shadow, rounded cards, refined blockquotes
simple	Minimal - modern minimalist, asymmetric rounded corners, clean whitespace
modern	Modern - large radius, pill-shaped titles, relaxed line height (pair with --color red for traditional red-gold style)

Step 1.5: Determine Citation Mode

Default: Off. Do not ask by default.

Enable only if the user explicitly asks for "微信外鏈轉底部引用", "底部引用", "文末引用", or passes --cite.

Behavior when enabled:

• Ordinary external links are rendered with numbered superscripts and collected under a final 引用連結 section.
• https://mp.weixin.qq.com/... links stay as direct links and are not moved to the bottom.
• Bare links where link text equals URL stay inline.

Step 2: Convert

${BUN_X} {baseDir}/scripts/main.ts <markdown_file> --theme <theme> [--cite]

Step 3: Report Result

Display the output path from JSON result. If backup was created, mention it.

Usage

${BUN_X} {baseDir}/scripts/main.ts <markdown_file> [options]

Options:

Option	Description	Default
--theme <name>	Theme name (default, grace, simple, modern)	default
--color <name|hex>	Primary color: preset name or hex value	theme default
--font-family <name>	Font: sans, serif, serif-cjk, mono, or CSS value	theme default
--font-size <N>	Font size: 14px, 15px, 16px, 17px, 18px	16px
--title <title>	Override title from frontmatter
--cite	Convert external links to bottom citations, append 引用連結 section	false (off)
--keep-title	Keep the first heading in content	false (removed)
--help	Show help

Color Presets:

Name	Hex	Label
blue	#0F4C81	Classic Blue
green	#009874	Emerald Green
vermilion	#FA5151	Vibrant Vermilion
yellow	#FECE00	Lemon Yellow
purple	#92617E	Lavender Purple
sky	#55C9EA	Sky Blue
rose	#B76E79	Rose Gold
olive	#556B2F	Olive Green
black	#333333	Graphite Black
gray	#A9A9A9	Smoke Gray
pink	#FFB7C5	Sakura Pink
red	#A93226	China Red
orange	#D97757	Warm Orange (modern default)

Examples:

# Basic conversion (uses default theme, removes first heading)
${BUN_X} {baseDir}/scripts/main.ts article.md

# With specific theme
${BUN_X} {baseDir}/scripts/main.ts article.md --theme grace

# Theme with custom color
${BUN_X} {baseDir}/scripts/main.ts article.md --theme modern --color red

# Enable bottom citations for ordinary external links
${BUN_X} {baseDir}/scripts/main.ts article.md --cite

# Keep the first heading in content
${BUN_X} {baseDir}/scripts/main.ts article.md --keep-title

# Override title
${BUN_X} {baseDir}/scripts/main.ts article.md --title "My Article"

Output

File location: Same directory as input markdown file.

• Input: /path/to/article.md
• Output: /path/to/article.html

Conflict handling: If HTML file already exists, it will be backed up first:

• Backup: /path/to/article.html.bak-YYYYMMDDHHMMSS

JSON output to stdout:

{
  "title": "Article Title",
  "author": "Author Name",
  "summary": "Article summary...",
  "htmlPath": "/path/to/article.html",
  "backupPath": "/path/to/article.html.bak-20260128180000",
  "contentImages": [
    {
      "placeholder": "MDTOHTMLIMGPH_1",
      "localPath": "/path/to/img.png",
      "originalPath": "imgs/image.png"
    }
  ]
}

Themes

Theme	Description
default	Classic - traditional layout, centered title with bottom border, H2 with white text on colored background
grace	Elegant - text shadow, rounded cards, refined blockquotes (by @brzhang)
simple	Minimal - modern minimalist, asymmetric rounded corners, clean whitespace (by @okooo5km)
modern	Modern - large radius, pill-shaped titles, relaxed line height (pair with --color red for traditional red-gold style)

Supported Markdown Features

Feature	Syntax
Headings	# H1 to ###### H6
Bold/Italic	**bold**, *italic*
Code blocks	```lang with syntax highlighting
Inline code	`code`
Tables	GitHub-flavored markdown tables
Images	
Links	[text](url); add --cite to move ordinary external links into bottom references
Blockquotes	> quote
Lists	- unordered, 1. ordered
Alerts	> [!NOTE], > [!WARNING], etc.
Footnotes	[^1] references
Ruby text	`{base
Mermaid	```mermaid diagrams
PlantUML	```plantuml diagrams

Frontmatter

Supports YAML frontmatter for metadata:

---
title: Article Title
author: Author Name
description: Article summary
---

If no title is found, extracts from first H1/H2 heading or uses filename.

Extension Support

Custom configurations via EXTEND.md. See Preferences section for paths and supported options.