Edit GIST

egist.sh

#!/bin/bash
# edit a gist file contents: https://developer.github.com/v3/gists/#edit-a-gist
# based on https://gist.github.com/noureddin/93d6182acdd1dcdf880daee1b97af05f

GITHUB_USERNAME=noureddin # change this to your github username

if [ $# -lt 2 ]; then
  printf "Usage: %s id filename [gistname]\n" $(basename "$0") >&2
  exit 1 # exit with error
fi

# Parse the arguments
id="$1"
filename="$2"
[ -z "$3" ] && gistname="$filename" || gistname="$3"

# Check the file
if ! [ -e "$filename" ]; then
  printf 'File "%s" not found!\n' "$filename" >&2
  exit 1
fi

# Somehow sanitize the file content
#  Remove \r (from Windows end-of-lines),
#  Replace \ by \\
#  Replace tabs by \t
#  Replace " by \"
#  Replace % by %%
#  Replace EOL by \n
filecontent=$(sed -e 's/\r//' -e 's/\\/\\\\/g' -e 's/\t/\\t/g' -e 's/"/\\&/g' -e 's/%/%%/g' "${filename}" | awk '{ printf($0 "\\n") }')

# Build the JSON request
read -r -d '' JSON <<EOF
{
  "files": {
    "${gistname}": {
      "content": "${filecontent}"
    }
  }
}
EOF

# Use curl to send a POST request
curl -u "${GITHUB_USERNAME}" -X PATCH -d "${JSON}" "https://api.github.com/gists/${id}"