gfm.sh

#!/bin/sh
if [ -t 0 ]; then
  # not tty
  if [ $# -ne 1 ]; then
    echo "usage:"
    echo " $0 filename"
    echo "or"
    echo " cat filename|$0"
    exit 1
  fi
  if [ ! -r $1 ]; then
    echo "$1 is not readable"
    exit 1
  fi

  curl -s -H "Content-Type: text/plain" --data-binary @- "https://api.github.com/markdown/raw" < $1
else
  curl -s -H "Content-Type: text/plain" --data-binary @- "https://api.github.com/markdown/raw"
fi