c

#!/usr/bin/env bash
# @Function
# Run command and put output to system clipper.
#
# @Usage
#   $ c ls -l
#   $ ls -l | c
#   $ c -q < ~/.ssh/id_rsa.pub
#
# @online-doc https://github.com/oldratlee/useful-scripts/blob/dev-3.x/docs/shell.md#-c
# @author Jerry Lee (oldratlee at gmail dot com)
set -eEuo pipefail

readonly PROG=${0##*/}
readonly PROG_VERSION='3.x-dev'

################################################################################
# util functions
################################################################################

redPrint() {
  # if stdout is a terminal, turn on color output.
  #   '-t' check: is a terminal?
  #   check isatty in bash https://stackoverflow.com/questions/10022323
  if [ -t 1 ]; then
    printf '\e[1;31m%s\e[0m\n' "$*"
  else
    printf '%s\n' "$*"
  fi
}

die() {
  local prompt_help=false exit_status=2
  while (($# > 0)); do
    case "$1" in
    -h)
      prompt_help=true
      shift
      ;;
    -s)
      exit_status=$2
      shift 2
      ;;
    *)
      break
      ;;
    esac
  done

  (($# > 0)) && redPrint "$PROG: $*"
  $prompt_help && echo "Try '$PROG --help' for more information."

  exit "$exit_status"
} >&2

usage() {
  cat <<EOF
Usage: $PROG [OPTION]... [command [command_args ...]]
Run command and put output to system clipper.
If no command is specified, read from stdin(pipe).

Example:
  $PROG grep -i 'hello world' menu.h main.c
  set | $PROG
  $PROG -q < ~/.ssh/id_rsa.pub

Options:
  -k, --keep-eol  do not trim new line at end of file
  -q, --quiet     suppress all normal output, default is false
  -h, --help      display this help and exit
  -V, --version   display version information and exit
EOF

  exit
}

progVersion() {
  printf '%s\n' "$PROG $PROG_VERSION"
  exit
}

################################################################################
# parse options
################################################################################

quiet=false
keep_eol=false
target_command=()
while (($# > 0)); do
  case "$1" in
  -k | --keep-eol)
    keep_eol=true
    shift
    ;;
  -q | --quiet)
    quiet=true
    shift
    ;;
  -h | --help)
    usage
    ;;
  -V | --version)
    progVersion
    ;;
  --)
    shift
    target_command=(${target_command[@]:+"${target_command[@]}"} "$@")
    break
    ;;
  -*)
    die -h "unrecognized option '$1'"
    ;;
  *)
    # if not option, treat all follow arguments as command
    target_command=(${target_command[@]:+"${target_command[@]}"} "$@")
    break
    ;;
  esac
done

readonly keep_eol quiet target_command

if ((${#target_command[@]} > 0)) && ! type -P "${target_command[0]}" &>/dev/null; then
  die "command '${target_command[0]}' not found on PATH"
fi

################################################################################
# biz logic
################################################################################

systemClip() {
  case "$(uname)" in
  Darwin*)
    pbcopy
    ;;
  CYGWIN* | MINGW*)
    clip
    ;;
  *)
    xsel -b
    ;;
  esac
}

bufferCopy() {
  local content
  content=$(cat)
  if $keep_eol; then
    printf '%s\n' "$content"
  else
    printf %s "$content"
  fi | systemClip
}

teeAndCopy() {
  if $quiet; then
    bufferCopy
  else
    tee >(bufferCopy)
  fi
}

if ((${#target_command[@]} == 0)); then
  teeAndCopy
else
  command "${target_command[@]}" | teeAndCopy
fi