generator.sh

#!/usr/bin/env bash

set -e
shopt -s expand_aliases

distFolder="dist"
distPrefix="ColorEcho"
table="color table.txt"

# use ColorEcho
bashDist="${distFolder}/${distPrefix}.bash"
# shellcheck source=dist/ColorEcho.bash
if [ ! -r "$bashDist" ] || [ ! -s "$bashDist" ] || ! . "$bashDist" &> /dev/null; then
  echo "${bashDist}" is not usable, fallback to use origin echo
  alias echo.BoldRed='echo'
  alias echo.BoldGreen='echo'
  alias echo.BoldYellow='echo'
else
  command -v echo.BoldRed &> /dev/null || alias echo.BoldRed='echo'
  command -v echo.BoldGreen &> /dev/null || alias echo.BoldGreen='echo'
  command -v echo.BoldYellow &> /dev/null || alias echo.BoldYellow='echo'
fi

mkdir -p "${distFolder}"
if [ ! -w "${distFolder}" ]; then
  echo.BoldRed "Dist folder - \"${distFolder}\" is not writable, exit ..."
  exit 1
fi

echo.BoldGreen "ColorEcho generator start!"

for shell in sh bash fish ksh zsh; do
  {
    echo.BoldYellow "Generating ColorEcho for ${shell} shell ..."
    # shell specify configs and tricks
    case "${shell}" in
      "bash" | "zsh")
        fn='function '
        dot='.'
        echo='echo -e'
        startSym=' {'
        endSym='}'
        endIf='fi'
        brackets='()'
        para='*'
        ;;
      "ksh")
        fn='function '
        dot=
        echo='echo -e'
        startSym=' {'
        endSym='}'
        endIf='fi'
        brackets=
        para='*'
        ;;
      "fish")
        fn='function '
        dot='.'
        echo='echo -e'
        startSym=
        endSym='end'
        endIf='end'
        brackets=
        para='argv'
        ;;
      "sh")
        fn=
        dot=
        # shellcheck disable=SC2016
        echo='$ECHO'
        startSym=' {'
        endSym='}'
        endIf='fi'
        brackets='()'
        para='*'
        ;;
    esac

    newDist="${distFolder}/${distPrefix}.${shell}"
    touch "${newDist}"
    if [ ! -w "${newDist}" ]; then
      echo.BoldRed "dist file - \"${newDist}\" is not writable, exit ..."
      exit 1
    fi

    tempDist="$(mktemp --suffix=ColorEcho)"
    echo "#!/usr/bin/env ${shell}" > "${tempDist}"

    cat << SH_ECHO >> "${tempDist}"

# ColorEchoForShell
# https://github.com/PeterDaveHello/ColorEchoForShell
# Copyright (C) 2015 ~ Peter Dave Hello
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or (at
# your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA.
SH_ECHO

    if [ "${shell}" = "sh" ]; then
      cat << SH_ECHO >> "${tempDist}"
if [ "\$(uname)" = "FreeBSD" ]; then
  ECHO="echo -e"
elif [ "\$(uname)" = "Darwin" ]; then
  ECHO="echo"
else
  ECHO="/bin/echo -e"
fi
SH_ECHO
    fi
    awk '{print $1}' "${table}" | while IFS= read -r color; do
      # light or not
      for light in "" "Light"; do
        if [ "${light}" = "" ]; then
          code=3
        else
          code=9
        fi
        # style like bold, italic, underline, blinking, strikethrough
        for style in "" "Bold" "I" "UL" "BL" "ST"; do
          case "${style}" in
            "Bold") styleCode='1;' ;;
            "I") styleCode='3;' ;;
            "UL") styleCode='4;' ;;
            "BL") styleCode='5;' ;;
            "ST") styleCode='9;' ;;
            "" | *) styleCode= ;;
          esac
          for style2 in "" "Bold" "I" "UL" "BL" "ST"; do
            if [ "${style}" != "${style2}" ]; then
              case "${style2}" in
                "Bold") finalStyleCode="${styleCode}1;" ;;
                "I") finalStyleCode="${styleCode}3;" ;;
                "UL") finalStyleCode="${styleCode}4;" ;;
                "BL") finalStyleCode="${styleCode}5;" ;;
                "ST") finalStyleCode="${styleCode}9;" ;;
                "" | *) finalStyleCode="${styleCode}" ;;
              esac
            else
              style2=
              finalStyleCode="${styleCode}"
            fi
            echoFunction="$(printf "%secho%s%s%s%s%s" "${fn}" "${dot}" "${light}" "${style}" "${style2}" "${color}")"
            if ! grep -q "${echoFunction}" "${tempDist}"; then
              {
                echo ""
                printf "%s%s" "${echoFunction}" "${brackets}"
                # write the code down
                echo "${startSym}"
                echo "  ${echo}"' "\\033['"${finalStyleCode}${code}""$(grep "${color}" "${table}" | awk '{print $2}')"'m$'"${para}"'\\033[m"'
                echo "${endSym}"
              } >> "${tempDist}"
            fi
          done
        done
      done
    done

    # rainbow output relys on lolcat
    fnName="${fn}echo${dot}Rainbow${brackets}"
    case "${shell}" in
      "fish")
        ifCond="if command -v lolcat > /dev/null"
        ;;
      "ksh")
        ifCond='if command -v lolcat 2> /dev/null >&2; then'
        ;;
      *)
        ifCond='if command -v lolcat > /dev/null 2>&1; then'
        ;;
    esac

    cat << LOLCAT >> "${tempDist}"
${fnName}${startSym}
  ${ifCond}
    echo "\$${para}" | lolcat
  else
    echo "\$${para}"
  ${endIf}
${endSym}
LOLCAT

    # echo.Reset to remove color code on output
    fnName="${fn}echo${dot}Reset${brackets}"
    cat << RESET >> "${tempDist}"
${fnName}${startSym}
  echo "\$${para}" | tr -d '[:cntrl:]' | sed -E "s/\\\\[((;)?[0-9]{1,3}){0,3}m//g" | xargs
${endSym}
RESET
    mv -f "${tempDist}" "${newDist}"
  } &
done

wait

echo.BoldGreen "ColorEcho generator end!"