Update kitty's colors from a terminal.sexy color scheme.

sexy2kitty

#!/usr/bin/env bash
# vim: sw=2 sts=2 et

# Update kitty's colors from a terminal.sexy color scheme (exported in JSON).
#
# Although there are at least a couple of PRs on terminal.sexy that add support
# for exporting color schemes for kitty, development on the repo seems to have
# gone stale and the PRs remain unmerged. This script reads a color scheme
# exported in the "JSON Scheme" format, and loads it into kitty's config after
# backing it up. Backups are created beside the original config. Dependencies
# are GNU coreutils and jq.
#
# chmod u+x it and run it with the --help option for usage information.

set -euo pipefail

helptxt="Update kitty's colors from terminal.sexy.

Usage: $(basename "$0") [options] [file...]

This utility reads a terminal color scheme exported from
terminal.sexy in the JSON Scheme format, and loads it into kitty's
config. Requires jq (https://github.com/stedolan/jq).

Options:
  -h, --help    Show help."


show_help()
{
  echo -e "$helptxt"
}


show_error()
{
  echo -e "ERROR: ${1:-'An error occurred.'}" >&2
}


assert_dependencies_present()
{
  if ! command -v jq >/dev/null; then
    show_error 'jq not found.'
    exit 1
  fi
}


main()
{
  assert_dependencies_present

  # --- PARSE CMD-LINE ARGS ---

  local argv=("$@")
  declare -a args=()

  for (( i=0; i<${#argv[@]}; i++ )); do
    local arg=${argv[$i]}
    case $arg in
      --)
        local next_idx=$(( i + 1 ))
        for (( j=next_idx; j<$#; j++ )); do
          args+=("${argv[$j]}")
        done
        break
        ;;
      -h | --help)
        show_help
        exit 0
        ;;
      -*)
        local msg="Unknown option $arg."
        msg="$msg\nUse the --help option for help."
        show_error "$msg"
        exit 1
        ;;
      *)
        args+=("$arg")
        ;;
    esac
  done

  if [[ ${#args[@]} -gt 1 ]]; then
    show_error "Too many arguments"
    exit 1
  fi

  # --- PARSE THE JSON COLOR SCHEME ---

  file=${args[0]:-/dev/stdin}
  if [[ ! -r $file ]]; then
    show_error "Cannot open file $file for reading."
    exit 1
  fi

  cs=$(<"$file")
  if [[ -z $cs ]]; then
    show_error "Input is empty."
    exit 1
  fi

  declare -A colors
  declare -a colors_18

  mapfile -t colors_18 < \
    <(echo -e "$cs" | jq --raw-output '.color[],.foreground,.background')

  for i in {0..15}; do
    colors["color$i"]=${colors_18[$i]}
  done

  colors[foreground]=${colors_18[16]}
  colors[background]=${colors_18[17]}
  
  # --- BACK-UP & UPDATE KITTY'S CONFIG ---

  local kitty_conf="${XDG_CONFIG_HOME:-$HOME/.config}/kitty/kitty.conf"
  
  if [[ ! -w $kitty_conf ]]; then
    show_error "Cannot open kitty's config at $kitty_conf for writing."
    exit 1
  fi

  kitty_conf_bak="$kitty_conf.$(date +'%Y%m%d%H%M%S').bak"
  cp "$kitty_conf" "$kitty_conf_bak"

  for key in "${!colors[@]}"; do
    sed --regexp-extended --in-place \
      "/^${key}[[:blank:]]/ s/#[[:xdigit:]]{6}/${colors[$key]}/" \
      "$kitty_conf"
  done

  return $?
}


main "$@"