baoyu-format-markdown

What this skill does

# Markdown Formatter

Transforms plain text or markdown files into well-structured markdown with proper frontmatter, formatting, and typography.

## Script Directory

Scripts in `scripts/` subdirectory. Replace `${SKILL_DIR}` with this SKILL.md's directory path.

| Script | Purpose |
|--------|---------|
| `scripts/main.ts` | Main entry point with CLI options (uses remark-cjk-friendly for CJK emphasis) |
| `scripts/quotes.ts` | Replace ASCII quotes with fullwidth quotes |
| `scripts/autocorrect.ts` | Add CJK/English spacing via autocorrect |

## Preferences (EXTEND.md)

Use Bash to check EXTEND.md existence (priority order):

```bash
# Check project-level first
test -f .baoyu-skills/baoyu-format-markdown/EXTEND.md && echo "project"

# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
test -f "$HOME/.baoyu-skills/baoyu-format-markdown/EXTEND.md" && echo "user"
```

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

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

**EXTEND.md Supports**: Default formatting options | Summary length preferences

## Usage

Claude performs content analysis and formatting (Steps 1-6), then runs the script for typography fixes (Step 7).

## Workflow

### Step 1: Read Source File

Read the user-specified markdown or plain text file.

### Step 1.5: Detect Content Type & Confirm

**Content Type Detection:**

| Indicator | Classification |
|-----------|----------------|
| Has `---` YAML frontmatter | Markdown |
| Has `#`, `##`, `###` headings | Markdown |
| Has `**bold**`, `*italic*` | Markdown |
| Has `- ` or `1. ` lists | Markdown |
| Has ``` code blocks | Markdown |
| Has `> ` blockquotes | Markdown |
| None of above | Plain text |

**Decision Flow:**

┌─────────────────┬────────────────────────────────────────────────┐
│  Content Type   │                     Action                     │
├─────────────────┼────────────────────────────────────────────────┤
│ Plain text      │ Proceed to Step 2 (format to markdown)         │
├─────────────────┼────────────────────────────────────────────────┤
│ Markdown        │ Use AskUserQuestion to confirm optimization    │
└─────────────────┴────────────────────────────────────────────────┘

**If Markdown detected, ask user:**

```
Detected existing markdown formatting. What would you like to do?

1. Optimize formatting (Recommended)
   - Add/improve frontmatter, headings, bold, lists
   - Run typography script (spacing, emphasis fixes)
   - Output: {filename}-formatted.md

2. Keep original formatting
   - Preserve existing markdown structure
   - Run typography script (spacing, emphasis fixes)
   - Output: {filename}-formatted.md

3. Typography fixes only
   - Run typography script on original file in-place
   - No copy created, modifies original file directly
```

**Based on user choice:**
- **Optimize**: Continue to Step 2-8 (full workflow)
- **Keep original**: Skip Steps 2-5, copy file → Step 6-8 (run script on copy)
- **Typography only**: Skip Steps 2-6, run Step 7 on original file directly

### Step 2: Analyze Content Structure

Identify:
- Existing title (H1 `#`)
- Paragraph separations
- Keywords suitable for **bold**
- Parallel content convertible to lists
- Code snippets
- Quotations

### Step 3: Check/Create Frontmatter

Check for YAML frontmatter (`---` block). Create if missing.

**Meta field handling:**

| Field | Processing |
|-------|------------|
| `title` | See Step 4 |
| `slug` | Infer from file path (e.g., `posts/2026/01/10/vibe-coding/` → `vibe-coding`) or generate from title |
| `summary` | Generate engaging summary (100-150 characters) |
| `coverImage` | Check if `imgs/cover.png` exists in same directory; if so, use relative path (also accepted: `featureImage`) |

### Step 4: Title Handling

**Logic:**
1. If frontmatter already has `title` → use it, no H1 in body
2. If first line is H1 → extract to frontmatter `title`, remove H1 from body
3. If neither exists → generate candidate titles

**Title generation flow:**

1. Generate 3 candidate titles based on content
2. Use `AskUserQuestion` tool:

```
Select a title:

1. [Title A] (Recommended)
2. [Title B]
3. [Title C]
```

3. If no selection within a few seconds, use recommended (option 1)

**Title principles:**
- Concise, max 20 characters
- Captures core message
- Engaging, sparks reading interest
- Accurate, avoids clickbait

**Important:** Once title is in frontmatter, body should NOT have H1 (avoid duplication)

### Step 5: Format Processing

**Formatting rules:**

| Element | Format |
|---------|--------|
| Titles | Use `#`, `##`, `###` hierarchy |
| Key points | Use `**bold**` |
| Parallel items | Convert to `-` unordered or `1.` ordered lists |
| Code/commands | Use `` `inline` `` or ` ```block``` ` |
| Quotes/sayings | Use `>` blockquote |
| Separators | Use `---` where appropriate |

**Formatting principles:**
- Preserve original content and viewpoints
- Add formatting only, do not modify text
- Formatting serves readability
- Avoid over-formatting

### Step 6: Save Formatted File

Save as `{original-filename}-formatted.md`

Examples:
- `final.md` → `final-formatted.md`
- `draft-v1.md` → `draft-v1-formatted.md`

**If user chose "Keep original formatting" (from Step 1.5):**
- Copy original file to `{filename}-formatted.md` without modifications
- Proceed to Step 7 for typography fixes only

**Backup existing file:**

If `{filename}-formatted.md` already exists, backup before overwriting:

```bash
# Check if formatted file exists
if [ -f "{filename}-formatted.md" ]; then
  # Backup with timestamp
  mv "{filename}-formatted.md" "{filename}-formatted.backup-$(date +%Y%m%d-%H%M%S).md"
fi
```

Example:
- `final-formatted.md` exists → backup to `final-formatted.backup-20260128-143052.md`

### Step 7: Execute Text Formatting Script

After saving, **must** run the formatting script:

```bash
npx -y bun ${SKILL_DIR}/scripts/main.ts {output-file-path} [options]
```

**Script Options:**

| Option | Short | Description | Default |
|--------|-------|-------------|---------|
| `--quotes` | `-q` | Replace ASCII quotes with fullwidth quotes `"..."` | false |
| `--no-quotes` | | Do not replace quotes | |
| `--spacing` | `-s` | Add CJK/English spacing via autocorrect | true |
| `--no-spacing` | | Do not add CJK/English spacing | |
| `--emphasis` | `-e` | Fix CJK emphasis punctuation issues | true |
| `--no-emphasis` | | Do not fix CJK emphasis issues | |
| `--help` | `-h` | Show help message | |

**Examples:**

```bash
# Default: spacing + emphasis enabled, quotes disabled
npx -y bun ${SKILL_DIR}/scripts/main.ts article.md

# Enable all features including quote replacement
npx -y bun ${SKILL_DIR}/scripts/main.ts article.md --quotes

# Only fix emphasis issues, skip spacing
npx -y bun ${SKILL_DIR}/scripts/main.ts article.md --no-spacing

# Disable all processing except frontmatter formatting
npx -y bun ${SKILL_DIR}/scripts/main.ts art