cb function and derivatives

cb.sh

### These are bash functions meant to be run directly in a shell.  
### You need to source this file in your shell.  Running it won't do anything

# A shortcut function that simplifies usage of xclip.
# - Accepts input from either stdin (pipe), or params.
cb()
{
  local SUCCESS_COLOR="\e[0;32m"
  local WARNING_COLOR="\e[1;31m"
  local TRUNCATE_COLOR="\e[0;33m"
  local RESET_COLOR="\e[0m"

  # Check that xclip is installed.
  if ! command -v xclip &>/dev/null; then
    echo -e "${WARNING_COLOR}You must have the 'xclip' program installed.${RESET_COLOR}"
    return 1
  fi

  # Check user is not root (root doesn't have access to user xorg server)
  if [[ "$USER" == "root" ]]; then
    echo -e "${WARNING_COLOR}Must be regular user (not root) to copy a file to the clipboard.${RESET_COLOR}"
    return 1
  fi

  # Determine the input source
  if ! [[ "$(tty)" == /dev/* ]]; then
    input="$(</dev/stdin)"
  else
    input="$*"
  fi

  # If no input, print usage message
  if [ -z "$input" ]; then
    echo "Copies a string to the clipboard."
    echo "Usage: cb <string>"
    echo "       echo <string> | cb"
    return 1
  fi

  # Copy input to clipboard
  echo -n "$input" | xclip -selection c

  # Truncate text for status
  if [ ${#input} -gt 80 ]; then
    input="$(echo "$input" | cut -c1-80)${TRUNCATE_COLOR}...${RESET_COLOR}"
  fi

  # Print status
  echo -e "${SUCCESS_COLOR}Copied to clipboard:${RESET_COLOR} $input"
}

# Aliases / functions leveraging the cb() function
# ------------------------------------------------
# Copy contents of a file
function cbf()
{
  cat "$1" | cb
}

# Copy SSH public key
alias cbssh="cbf ~/.ssh/id_rsa.pub"

# Copy current working directory
alias cbwd="pwd | cb"

# Copy most recent command in bash history
alias cbhs="cat $HISTFILE | tail -n 1 | cb"