#! /usr/bin/env bash
set -e
[ -n "$TMUXIFIER_DEBUG" ] && set -x

resolve_link() {
  $(type -p greadlink readlink | head -1) $1
}

abs_dirname() {
  local cwd="$(pwd)"
  local path="$1"

  while [ -n "$path" ]; do
    cd "${path%/*}"
    local name="${path##*/}"
    path="$(resolve_link "$name" || true)"
  done

  pwd
  cd "$cwd"
}

if [ -z "${TMUXIFIER}" ]; then
  # Set TMUXIFIER relative to the "tmuxifier" executable.
  export TMUXIFIER="$(dirname "$(abs_dirname "$0")")"
else
  # Strip any trailing slash (/) characters from TMUXIFIER variable.
  export TMUXIFIER="${TMUXIFIER%/}"
fi

# Load tmuxifier environment variables.
source "$TMUXIFIER/lib/env.sh"

# Add tmuxifier's internal commands to PATH.
export PATH="$TMUXIFIER/libexec:$PATH"

# Check Tmux version.
export TMUXIFIER_MIN_TMUX_VERSION="1.6"
if [ "$(tmuxifier-tmux-version "$TMUXIFIER_MIN_TMUX_VERSION")" == "<" ]; then
  echo -e "ERROR: Tmuxifier requires Tmux v${TMUXIFIER_MIN_TMUX_VERSION}" \
       "or newer. You have v$(tmuxifier-tmux-version)." >&2
  exit 1
fi

# Parse given command
command="$1"
case "$command" in
  "" | "-h" | "--help" )
    echo -e "tmuxifier $(tmuxifier-version)\n$(tmuxifier-help)" >&2
    ;;

  "-v" | "--version" )
    tmuxifier-version
    ;;

  * )
    ! command_path="$(tmuxifier-resolve-command-path "$command")"

    if [ -z "$command_path" ]; then
      echo "tmuxifier: no such command '$command'" >&2
      exit 1
    fi

    shift 1
    exec "$command_path" "$@"
    ;;
esac