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pandoc-unicode-sanitize

Prepare Markdown for pandoc PDF conversion by replacing problematic Unicode symbols with ASCII alternatives. The skill covers reusable substitution scripts, broader character conversion, and alternative PDF engines for documents that need to retain Unicode.

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Pre-process Markdown to replace non-ASCII characters before pandoc PDF conversion

HKUDS/OpenSpace

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适用场景

Fixing Unicode errors during Markdown-to-PDF conversion
Standardizing replacements for currency symbols and arrows
Choosing a PDF engine that preserves Unicode characters

包含的文件（2）

SKILL.md2.6 KB
.skill_id37 B

SKILL.md（原文）

安装前可以查看交给 AI 代理的指令内容。

Pandoc Unicode Sanitization for PDF Conversion

Problem

LaTeX (used by pandoc for PDF output) may fail or produce errors when encountering non-ASCII Unicode characters like currency symbols (₹, €, £), special quotes, or other Unicode characters not supported by the default LaTeX engine.

Solution

Pre-process Markdown files to replace problematic Unicode characters with ASCII equivalents before running pandoc PDF conversion.

Steps

1. Identify Problematic Characters

Common problematic characters include:

Currency symbols: ₹, €, £, ¥
Special quotes: " " ' '
Arrows: →, ←, ↑, ↓
Bullets: •, ◦
Other symbols: ©, ®, ™, ±, ×, ÷, —, –

2. Create a Sed Substitution Script

Create a shell script for reusable sanitization:

#!/bin/bash
# sanitize-for-pdf.sh

sed -e 's/₹/Rs/g' \
    -e 's/€/EUR/g' \
    -e 's/£/GBP/g' \
    -e 's/¥/JPY/g' \
    -e 's/"/"/g' \
    -e 's/"/"/g' \
    -e "s/'/'/g" \
    -e "s/'/'/g" \
    -e 's/→/->/g' \
    -e 's/←/<-/g' \
    -e 's/•/-/g' \
    -e 's/©/(c)/g' \
    -e 's/®/(R)/g' \
    -e 's/™/(TM)/g' \
    -e 's/±/+/ -/g' \
    -e 's/×/x/g' \
    -e 's/÷/\//g' \
    -e 's/—/--/g' \
    -e 's/–/-/g' \
    "$1"

3. Run Sanitization Before Pandoc

# Using the script
./sanitize-for-pdf.sh input.md > sanitized.md
pandoc sanitized.md -o output.pdf

# Or inline
cat input.md | sed 's/₹/Rs/g; s/€/EUR/g; s/£/GBP/g' | pandoc -o output.pdf

4. Alternative: Use iconv for Automatic Transliteration

For broader Unicode coverage:

iconv -f UTF-8 -t ASCII//TRANSLIT < input.md > sanitized.md
pandoc sanitized.md -o output.pdf

5. Alternative: Use XeLaTeX or LuaLaTeX Engine

If you want to preserve Unicode characters, use a Unicode-capable engine:

pandoc input.md -o output.pdf --pdf-engine=xelatex
# or
pandoc input.md -o output.pdf --pdf-engine=lualatex

Best Practices

Sanitize files before conversion rather than debugging LaTeX errors after
Keep a mapping of your organization's common symbols and preferred replacements
Test with a small sample before processing large documents
Consider using XeLaTeX/LuaLaTeX if Unicode preservation is required
Document which characters cause issues in your specific environment

Common Error Signs

Look for these LaTeX errors that indicate Unicode issues:

Package inputenc Error: Unicode character ... not set up
LaTeX Error: Unicode character ... cannot be used with pdflatex
Missing or garbled characters in the output PDF

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