generate 'git clone' command using git protocol.

gist-https2git.sh

#!/bin/bash
#
# requires:
#  bash
#
# description:
#
#  https://gist.github.com/012345678abcdefgh.git
#      git@gist.github.com:012345678.git
#
set -e

## functions

function usage() {
  cat <<-EOS
        SYNOPSIS:
            ${0##*/} [ gist-uri ]

        EXAMPLES:
            ${0##*/} https://gist.github.com/012345678abcdefgh.git
        EOS
}

function validate_parameter() {
  [[ -n "${git_uri}" ]] || return 1
}

## variables

declare git_uri=$1
declare long_hash=${git_uri##*/}; long_hash=${long_hash%%.git}
declare short_hash=${long_hash:0:7}

## validate

validate_parameter || {
  usage
  exit 1
}

## main

echo git clone git@gist.github.com:${long_hash}.git gist-${short_hash}