Ghostty Terminal Theme Picker

ghostty-theme-picker.sh

#!/usr/bin/env bash
set -euo pipefail

# Pick a Ghostty theme using fzf, strip "(resources)"-style suffixes,
# write it to the config, then tell the user to reload Ghostty.
#
# Requirements:
#   - fzf: sudo apt install fzf
#   - ghostty in PATH (unless using --user-only)
#   - perl (for in-place config edits)

CFG="${XDG_CONFIG_HOME:-$HOME/.config}/ghostty/config"
mkdir -p "$(dirname "$CFG")"
touch "$CFG"

# If you want a curated list, add theme names below and run:
#   ./ghostty_themes.sh --user-only
USER_THEMES=(
  "Andromeda"
  "Arcoiris"
  "Ayu Mirage"
  "Builtin Pastel Dark"
  "Carbonfox"
  "Catppuccin Mocha"
  "Dracula"
  "Dracula+"
  "GitHub Dark Default"
  "GitLab Dark Grey"
  "Monokai Pro"
  "Monokai Pro Dusk"
  "Monokai Pro Spectrum"
  "Seti"
  "TokyoNight Night"
  "Wombat"
)

USER_ONLY=0
AUTO_RELOAD=1
SUPPRESS_RELOAD_TOAST=1

usage() {
  cat <<'USAGE'
Usage: ghostty_themes.sh [--user-only] [--no-auto-reload]

  --user-only  Use only themes listed in USER_THEMES inside this script.
  --no-auto-reload  Do not auto-reload Ghostty after writing the config.
USAGE
}

die() {
  echo "$*" >&2
  exit 1
}

require_cmd() {
  command -v "$1" >/dev/null 2>&1 || die "Missing dependency: $1"
}

escape_for_double_quotes() {
  local s="$1"
  s="${s//\\/\\\\}"
  s="${s//\"/\\\"}"
  printf '%s' "$s"
}

while [ $# -gt 0 ]; do
  case "$1" in
    --user-only)
      USER_ONLY=1
      ;;
    --no-auto-reload)
      AUTO_RELOAD=0
      ;;
    -h|--help)
      usage
      exit 0
      ;;
    --)
      shift
      break
      ;;
    *)
      die "Unknown option: $1"
      ;;
  esac
  shift
done

[ $# -eq 0 ] || die "Unexpected arguments: $*"

require_cmd fzf
require_cmd perl
if [ "$USER_ONLY" -eq 0 ]; then
  require_cmd ghostty
fi

THEMES=()

ensure_no_reload_toast() {
  local current val new_val t has_no=0
  current="$(sed -nE 's/^[[:space:]]*app-notifications[[:space:]]*=[[:space:]]*(.*)$/\1/p' "$CFG" | head -n1)"
  if [ -z "$current" ]; then
    printf '\napp-notifications = no-config-reload\n' >> "$CFG"
    return 0
  fi
  val="$(printf '%s' "$current" | tr -d '[:space:]')"
  val="${val#\"}"; val="${val%\"}"
  val="${val#\'}"; val="${val%\'}"
  if [ "$val" = "false" ]; then
    return 0
  fi
  if [ "$val" = "true" ]; then
    new_val="no-config-reload"
  else
    IFS=',' read -r -a parts <<< "$val"
    new_val=""
    for t in "${parts[@]}"; do
      [ -n "$t" ] || continue
      if [ "$t" = "no-config-reload" ]; then
        has_no=1
        new_val="${new_val:+$new_val,}$t"
        continue
      fi
      if [ "$t" = "config-reload" ]; then
        continue
      fi
      new_val="${new_val:+$new_val,}$t"
    done
    if [ "$has_no" -eq 0 ]; then
      new_val="${new_val:+$new_val,}no-config-reload"
    fi
  fi
  APP_NOTIFICATIONS_LINE="app-notifications = $new_val" \
    perl -0777 -i -pe 's/^[[:space:]]*app-notifications[[:space:]]*=.*$/$ENV{APP_NOTIFICATIONS_LINE}/m' "$CFG"
}

if [ "$USER_ONLY" -eq 1 ]; then
  if [ "${#USER_THEMES[@]}" -eq 0 ]; then
    echo "USER_THEMES is empty. Add themes in the script or run without --user-only." >&2
    exit 1
  fi
  for t in "${USER_THEMES[@]}"; do
    [ -n "$t" ] || continue
    THEMES+=("$t")
  done
else
  # Filter to dark themes by checking background luminance in each theme file.
  # Single awk process to avoid per-theme process overhead.
  mapfile -t THEMES < <(
    ghostty +list-themes --plain --path | awk '
      function trim(s) { sub(/^[ \t]+/, "", s); sub(/[ \t]+$/, "", s); return s }
      function is_dark(hex, r, g, b, l) {
        if (hex == "") return 1
        hex = trim(hex)
        if (substr(hex,1,1) == "#") hex = substr(hex,2)
        if (hex !~ /^[0-9A-Fa-f]{6}$/) return 1
        r = strtonum("0x" substr(hex,1,2))
        g = strtonum("0x" substr(hex,3,2))
        b = strtonum("0x" substr(hex,5,2))
        l = 0.2126*r + 0.7152*g + 0.0722*b
        return (l < 128)
      }
      {
        line = $0
        idx = index(line, " /")
        if (idx == 0) next
        name = substr(line, 1, idx - 1)
        path = substr(line, idx + 2)
        if (substr(path,1,1) != "/") path = "/" path
        sub(/[ \t]*\([^)]*\)[ \t]*$/, "", name)

        bg = ""
        while ((getline l < path) > 0) {
          if (l ~ /^[ \t]*background[ \t]*=/) {
            split(l, parts, "=")
            bg = parts[2]
            gsub(/[ \t]/, "", bg)
            break
          }
        }
        close(path)
        if (is_dark(bg)) print name
      }'
  )
fi

if [ "${#THEMES[@]}" -eq 0 ]; then
  echo "No themes available after filtering." >&2
  exit 1
fi

LAST_POS=0
USE_TAC=1
while true; do
  # Pick a theme (plain output is best for piping)
  FZF_OPTS=(--prompt='Ghostty theme> ' --height=60% --border --tac)
  if [ "$LAST_POS" -gt 0 ]; then
    FZF_OPTS+=(--bind "load:pos($LAST_POS)")
  else
    # With --tac, "last" moves to the top-most displayed item.
    FZF_OPTS+=(--bind "load:last")
  fi
  RAW_THEME="$(printf '%s\n' "${THEMES[@]}" | fzf "${FZF_OPTS[@]}")"
  [ -n "$RAW_THEME" ] || exit 0

  # Strip any trailing " (something)" suffix (e.g. "Andromeda (resources)" -> "Andromeda")
  THEME="$(printf '%s' "$RAW_THEME" | sed -E 's/[[:space:]]*\([^)]*\)[[:space:]]*$//')"
  LAST_POS=0
  total="${#THEMES[@]}"
  for i in "${!THEMES[@]}"; do
    if [ "${THEMES[$i]}" = "$RAW_THEME" ] || [ "${THEMES[$i]}" = "$THEME" ]; then
      if [ "$USE_TAC" -eq 1 ]; then
        LAST_POS=$((total - i))
      else
        LAST_POS=$((i + 1))
      fi
      break
    fi
  done

  # Write to config: replace existing theme line or append a new one.
  # Always quote the theme name because many themes contain spaces.
  THEME_LINE="theme = \"$(escape_for_double_quotes "$THEME")\""
  if grep -qE '^[[:space:]]*theme[[:space:]]*=' "$CFG"; then
    # Replace the first matching theme line
    THEME_LINE="$THEME_LINE" perl -0777 -i -pe 's/^[[:space:]]*theme[[:space:]]*=.*$/$ENV{THEME_LINE}/m' "$CFG"
  else
    printf '\n%s\n' "$THEME_LINE" >> "$CFG"
  fi

  echo "Theme set to: $THEME"

  if [ "$AUTO_RELOAD" -eq 1 ]; then
    if [ "$SUPPRESS_RELOAD_TOAST" -eq 1 ]; then
      ensure_no_reload_toast
    fi
    # Try to auto-reload Ghostty by sending the default keybind.
    # This requires the Ghostty window to be focused.
    RELOADED=0
    if [ -n "${WAYLAND_DISPLAY-}" ]; then
      if command -v wtype >/dev/null 2>&1; then
        wtype -M ctrl -M shift r -m shift -m ctrl
        RELOADED=1
      elif command -v ydotool >/dev/null 2>&1; then
        ydotool key 29:1 42:1 19:1 19:0 42:0 29:0
        RELOADED=1
      fi
    elif [ -n "${DISPLAY-}" ]; then
      if command -v xdotool >/dev/null 2>&1; then
        xdotool key --clearmodifiers ctrl+shift+r
        RELOADED=1
      fi
    fi

    if [ "$RELOADED" -eq 1 ]; then
      echo "Reloaded Ghostty config."
    else
      echo 'Now reload Ghostty (default shortcut): Ctrl+Shift+R'
      echo 'Tip: install xdotool (X11) or wtype/ydotool (Wayland) to auto-reload.'
    fi
  else
    echo 'Now reload Ghostty (default shortcut): Ctrl+Shift+R'
    echo 'Tip: re-run with --auto-reload if you want the script to trigger reloads.'
  fi
done