omk-pdf-gen

Documents

Generate professional PDF documents with correct CJK (Chinese/Japanese/Korean) rendering. Trigger when user says 'generate PDF', 'create PDF', 'export PDF', '生成 PDF', '导出 PDF', '做个 PDF', 'make a PDF', or when any task requires producing a PDF file. Also trigger when user mentions PDF formatting issues, garbled text, or font problems.

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How to use this skill

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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/KaimingWan/oh-my-kiro/blob/HEAD/skills/omk-pdf-gen/SKILL.md

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PDF Generation Skill

Trigger Examples

"帮我生成一个报价 PDF"
"把这个内容导出成 PDF"
"PDF 中文乱码怎么办"
"generate a comparison PDF for this customer"
"create a budget proposal PDF"

Approach: HTML + weasyprint

Use HTML + CSS → weasyprint pipeline. Do NOT use reportlab for documents containing CJK text.

Why:

reportlab CID fonts (STSong-Light) have incomplete glyph coverage — symbols like • render as garbage (e.g. "煉")
reportlab cannot read macOS SIP-protected TTC fonts (PingFang etc.)
reportlab canvas API requires manual coordinate positioning — fragile and ugly
weasyprint uses system fontconfig — correct font resolution out of the box

Workflow

Step 1: Write HTML string in Python

HTML = """\
<!DOCTYPE html>
<html lang="zh">
<head><meta charset="utf-8">
<style>
@page { size: A4; margin: 2cm 2.2cm; }
body { font-family: "Hiragino Sans GB", "Heiti SC", "Noto Sans CJK SC", sans-serif; ... }
</style></head>
<body>...</body></html>
"""

Step 2: Write to temp HTML, convert, clean up

import subprocess, os
html_tmp = output_path.replace('.pdf', '.html')
with open(html_tmp, 'w', encoding='utf-8') as f:
    f.write(HTML)
subprocess.run(['weasyprint', html_tmp, output_path], check=True)
os.remove(html_tmp)

Font Rules (Critical)

Platform	CSS font-family	Notes
macOS	`"Hiragino Sans GB", "Heiti SC"`	Verified via `fc-list :lang=zh`
Linux	`"Noto Sans CJK SC", "WenQuanYi Micro Hei"`	Install `fonts-noto-cjk` if missing
Fallback	`sans-serif`	Always include as last resort

Never use these in weasyprint CSS:

-apple-system — weasyprint doesn't understand Apple system font aliases
"PingFang SC" — fontconfig often can't resolve it even though macOS has it
"STSong-Light" — CID font name, not a real font family for CSS

Before generating, verify CJK fonts are available:

fc-list :lang=zh family | head -10

Styling Best Practices

Use standard HTML elements — weasyprint handles them well:

<table> with CSS border-collapse: collapse for data tables
<ul>/<li> for bullet lists (no manual bullet symbols needed)
<h1>-<h3> for headings
<hr> for dividers
CSS @page for margins and page size

Recommended CSS skeleton

@page { size: A4; margin: 2cm 2.2cm; }
body { font-family: "Hiragino Sans GB", "Heiti SC", "Noto Sans CJK SC", sans-serif;
       font-size: 11pt; color: #1a1a2e; line-height: 1.7; }
h1 { font-size: 22pt; text-align: center; }
h3 { font-size: 13pt; color: #1a73e8; }
table { width: 100%; border-collapse: collapse; font-size: 10pt; }
th { background: #1a73e8; color: #fff; padding: 7pt 10pt; text-align: left; }
td { padding: 6pt 10pt; border-bottom: 1px solid #e5e7eb; }
tr:nth-child(even) td { background: #f8f9fa; }

When reportlab IS acceptable

English-only documents where you need precise programmatic layout (charts, diagrams, pixel-perfect positioning). Use platypus (SimpleDocTemplate + Paragraph + Table), never raw canvas API.

Reference: tools/gen-73strings-pdfs.py — good example of reportlab platypus for English PDFs.

Anti-Patterns (from real incidents)

Don't	Why	Do Instead
reportlab + STSong-Light for CJK	`•` → "煉", incomplete glyphs	weasyprint + system fonts
reportlab `canvas` manual positioning	Fragile coordinates, misaligned text	weasyprint or reportlab `platypus`
CSS `font-family: -apple-system`	weasyprint can't resolve it	Use `"Hiragino Sans GB"`
CSS `font-family: "PingFang SC"`	fontconfig often fails to find it	Use `"Hiragino Sans GB"`
Helvetica-Bold for table headers with CJK	CJK chars render as ■■■	Use CJK font + `font-weight: bold`
Hardcode font without checking	Fails on different OS	Run `fc-list :lang=zh` first

Output

Place generated script in tools/gen-<name>-pdf.py. The script should:

Define HTML as a string constant
Write temp HTML → call weasyprint → remove temp HTML
Print the output path on success