cb shell function

cb.zsh

 # A shortcut function that simplifies usage of xclip.
 # - Accepts input from either stdin (pipe), or params.
 # - If the input is a filename that exists, then it
 #   uses the contents of that file.
 # ------------------------------------------------
 cb() {
   emulate bash
   local _scs_col="\e[0;32m"; local _wrn_col='\e[1;31m'; local _trn_col='\e[0;33m'
   # Check that xclip is installed.
   if ! which xclip | grep xclip -q; then
     echo -e "$_wrn_col""You must have the 'xclip' program installed.\e[0m"
   # Check user is not root (root doesn't have access to user xorg server)
   elif [[ $(whoami) == root ]]; then
     echo -e "$_wrn_col""Must be regular user (not root) to copy a file to the clipboard.\e[0m"
   else
     # If no tty, data should be available on stdin
     if [ "$( tty )" == 'not a tty' ]; then
       input="$(< /dev/stdin)"
     # Else, fetch input from params
     else
       input="$*"
     fi
     if [ -z "$input" ]; then  # If no input, print usage message.
       echo "Copies a string or the contents of a file to the clipboard."
       echo "Usage: cb <string or file>"
       echo "       echo <string or file> | cb"
     else
       # If the input is a filename that exists, then use the contents of that file.
       if [ -e "$input" ]; then input="$(cat $input)"; fi
       # Copy input to clipboard
       echo -n "$input" | xclip -selection c
       # Truncate text for status
       if [ ${#input} -gt 80 ]; then input="$(echo $input | cut -c1-80)$_trn_col...\e[0m"; fi
       # Print status.
       echo -e "$_scs_col""Copied to clipboard:\e[0m $input"
     fi
   fi
   emulate zsh
 }