downloads rpi bash customization files from gist and creates local files

pi.set_pi_shell.sh

#!/usr/bin/bash
set -e

echo ""
echo ""
echo "Setting bash shell customizations for Raspian or Ubuntu-server based Pi's"
echo "LET'S GO NOW!!"

function file.fetch () {
  SOURCE=$1
  DEST=$2

# echo "source: $SOURCE"
# echo "dest: $DEST"
 if [[ -s $2 ]]; then
    echo ""
    echo "🚨🚨 $2 exists and is not empty 🚨🚨"
    echo ""
  else
    echo ""
    echo "🛰 Creating new $2 from gist..."
    /usr/bin/curl -s "$1"   > $2
    echo "☑️  Done."
    echo ""
  fi
}


SOURCES_URL='https://gist.githubusercontent.com/sandalsoft/25c21ee34a67a9096f8ebb8a9ee2d437/raw/adaa74ed8271b37642328a85d26ab6dd8e02c36f/pi.bash_sources'
SOURCES_FILE='.bash_sources'

BASHRC_URL='https://gist.githubusercontent.com/sandalsoft/a1bd0ec84300b8f5c7ddff38784eef17/raw/ce882b3f2b3b5437248d0b7f87833aab3c9c6632/pi.bashrc'
BASHRC_FILE='.bashrc'
EXPORTS_URL='https://gist.githubusercontent.com/sandalsoft/4b69f8cca0715b6d4d81663c04263f46/raw/720fbd59274f2aff7e91195ef17aa3d60b1813e4/pi.bash_exports'
EXPORTS_FILE='.bash_exports'
FUNCTIONS_URL='https://gist.githubusercontent.com/sandalsoft/e98217a84d76e5ba798ff759d5471d38/raw/9d16a5095fa6ea2ae601e1552f3c9f8aef10434f/pi.bash_functions'
FUNCTIONS_FILE='.bash_functions'
ALIASES_URL='https://gist.githubusercontent.com/sandalsoft/24ef4188354b179e2515a9da824f57c4/raw/70895000162b6f66118bc7c7fb33b9afc3f79592/pi.bash_aliases'
ALIASES_FILE='.bash_aliases'


file.fetch $SOURCES_URL $SOURCES_FILE
file.fetch $BASHRC_URL $BASHRC_FILE
file.fetch $EXPORTS_URL $EXPORTS_FILE
file.fetch $FUNCTIONS_URL $FUNCTIONS_FILE
file.fetch $ALIASES_URL $ALIASES_FILE