Keyboard.io palette JSON generator

palette.sh

#!/bin/sh
# Author:    mattmc3
# Copyright: 2023
# License:   MIT

print_err() {
  printf '%s\n' "$my_name: Error: $1" >&2
  exit ${2:-1}
}

init() {
  if ! command -v fzf >/dev/null; then
    print_err "Command not found 'fzf'. Install from https://github.com/junegunn/fzf."
  fi
  iterm2dir=$XDG_CACHE_HOME/palette/iterm2cs
  if ! test -d "$iterm2dir"; then
    git clone --depth 1 --quiet https://github.com/mbadolato/iTerm2-Color-Schemes $iterm2dir 2>/dev/null
    regen_theme_files
  fi
  unset iterm2dir
}

regen_theme_files() {
  # use .conf files from lxterminal to make .sh files we can source later
  rm -rf -- ${my_workdir}/themes
  mkdir -p ${my_workdir}/themes
  for file in ${iterm2dir}/lxterminal/*.conf; do
    grep 'palette_color_[0-7]=' "$file" | sort | \
      awk '
      BEGIN{FS="[_=]"; OFS="="; c="black_red_green_yellow_blue_magenta_cyan_white"; split(c, colors)}
      {print colors[$3+1],"\""$4"\""}
      ' > "${my_workdir}/themes/$(basename "$file" .conf).sh"
  done
  unset file
}

palette_update() {
  echo "Updating color schemes..."
  git -C "$XDG_CACHE_HOME/palette/iterm2cs" pull --quiet
  regen_theme_files
  echo "Done."
}

palette_choose() {
  result=$(palette_list | fzf --layout=reverse-list --preview "palette preview ${my_workdir}/themes/{}.sh" --query="$@")
  [[ $? -eq 0 ]] || return 1
  palette_print "${my_workdir}/themes/${result}.sh"
  unset result
}

palette_print() {
  if ! test -f "$1"; then
    print_err "Color scheme file not found '$1'."
  fi
  source "$1"

  rgb_fmt='  {"r": %s, "g": %s, "b": %s, "rgb": "rgb(%s, %s, %s)"}'
  printf '%s\n' '"palette": ['
  printf "$rgb_fmt" 0 0 0 0 0 0
  for color_name in red green yellow blue magenta cyan white black; do
    rgb="$(eval echo $(echo "\$$color_name"))"
    set -- $(echo "$rgb" | awk -F '[\(\),]' '{print $2, $3, $4}')
    printf ",\n${rgb_fmt}" $1 $2 $3 $1 $2 $3
  done
  for num in $(seq 1 7); do
    printf ",\n${rgb_fmt}" 0 0 0 0 0 0
  done
  printf '\n%s\n' ']'
  unset rgb_fmt num rgb
}

palette_preview() {
  if ! test -f "$1"; then
    print_err "Color scheme file not found '$1'."
  fi
  source "$1"

  for color_name in red green yellow blue magenta cyan white black
  do
    rgb="$(eval echo $(echo "\$$color_name"))"
    set -- $(echo "$rgb" | awk -F '[\(\),]' '{print $2, $3, $4}')
    printf "\x1b[38;2;%s;%s;%sm%-10s\x1b[0m rgb(%3s, %3s, %3s)\n" $1 $2 $3 $color_name $1 $2 $3
  done
  unset color_name rgb
}

palette_list() {
  for file in "${my_workdir}"/themes/*.sh; do
    basename "$file" .sh
  done
  unset file
}

# declare vars
my_name="palette"
test -n "$XDG_CACHE_HOME" || XDG_CACHE_HOME=$HOME/.cache
my_workdir=$XDG_CACHE_HOME/palette
my_help="\
Usage: $my_name [options] <command>

Options:
  -h, --help   Print this help and exit

Subcommands:
  choose       Choose LED color scheme (default)
  list         List available color schemes
  update       Update available color schemes
  preview      Preview color scheme
"

# parse options
while test "${1#-}" != "$1"; do
  case "$1" in
    -h | --help)
      printf '%s\n' "$my_help"
      exit 0
      ;;
    --)
      # No more options to process
      shift
      break
      ;;
    *)
      print_err "invalid option $1"
      ;;
  esac
done

init
if test -z "$1"; then
  my_cmd=choose
else
  my_cmd=$1; shift
fi

if ! typeset -f "palette_${my_cmd}" >/dev/null; then
  print_err "Subcommand not found '$my_cmd'."
else
  my_name="$my_name $my_cmd"
  "palette_${my_cmd}" "$@"
fi