davidlee · January 27, 2026 00:40
diff --git a/md-context-packer.py b/md-context-packer.py
 #!/usr/bin/env python3
 """Pack files into a markdown document with code fences for LLM context upload."""

 import sys
 from pathlib import Path

 # Common extension -> fence language mappings
 LANG_MAP = {
  ".py": "python",
  ".js": "javascript",
  ".ts": "typescript",
  ".tsx": "tsx",
  ".jsx": "jsx",
  ".zig": "zig",
  ".rs": "rust",
  ".go": "go",
  ".c": "c",
  ".cpp": "cpp",
  ".h": "c",
  ".hpp": "cpp",
  ".java": "java",
  ".rb": "ruby",
  ".sh": "bash",
  ".bash": "bash",
  ".zsh": "zsh",
  ".json": "json",
  ".yaml": "yaml",
  ".yml": "yaml",
  ".toml": "toml",
  ".md": "markdown",
  ".sql": "sql",
  ".html": "html",
  ".css": "css",
  ".lua": "lua",
 }


 def ext_to_lang(path: Path) -> str:
  ext = path.suffix.lower()
  return LANG_MAP.get(ext, ext.lstrip(".") or "text")


 def main():
  if len(sys.argv) < 2 or sys.argv[1] in ("-h", "--help"):
    print(
      "Usage: md-context-packer.py <output.md> file1 [file2 ...]\n"
      "       cat files.txt | md-context-packer.py <output.md>",
      file=sys.stderr,
    )
    sys.exit(0 if len(sys.argv) > 1 else 1)

  output = Path(sys.argv[1])

  # Files from args, or stdin if piped
  if len(sys.argv) > 2:
    files = [Path(f) for f in sys.argv[2:]]
  elif not sys.stdin.isatty():
    files = [Path(line.strip()) for line in sys.stdin if line.strip()]
  else:
    print("Error: no files provided", file=sys.stderr)
    sys.exit(1)

  with output.open("w") as out:
    for path in files:
      if not path.exists():
        print(f"Warning: {path} not found, skipping", file=sys.stderr)
        continue
      lang = ext_to_lang(path)
      content = path.read_text()
      out.write(f"## `{path}`\n\n```{lang}\n{content}```\n\n")

  print(f"Wrote {len(files)} files to {output}", file=sys.stderr)


 if __name__ == "__main__":
  main()
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