#!/bin/sh -euf
#
# DPP - Bonus shell implementation.
#
# Copyright (c) 2026 Dylan Araps
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#

: "${DPP_EOF_MARKER:=___DPPEOFMARKER___}"
: "${DPP_SHELL:=/bin/sh}"

{
  echo "#!$DPP_SHELL"
  echo "# This file has been generated by dylanaraps/dpp."
  echo "(set -euo pipefail 2>/dev/null) && set -eo pipefail || set -eu"
  echo "export DPP_VERSION=1.0.1"
  echo "export DPP_LEVEL=\$((DPP_LEVEL + 1))"
  echo "set -- $*"
  echo "${DPP_INCLUDE:+. \""$DPP_INCLUDE"\"}"

  while IFS= read -r l; do case $l in
    "${DPP_BLOCK:=!!}"*)
      case ${b:-0} in 2)
        echo "$DPP_EOF_MARKER"
        b=0
      esac

      l=${l#"$DPP_BLOCK"}

      case $l in
          '') b=$((!b)) ;;
        " "*) b=0 l=${l#?} ;;
           *) b=0 ;;
      esac

      echo "$l"
    ;;

    *)
      case $l in *\\) l=$l\\; esac

      case ${b:-0} in 0)
      	echo "\${DPP_CAT:=cat} << $DPP_EOF_MARKER"
        b=2
      esac

      echo "$l"
  esac done

  case $b in
    1) echo "error: DPP_BLOCK not closed" >&2; exit 1 ;;
    2) echo "$DPP_EOF_MARKER" ;;
  esac

} | case ${0##*/} in
  dpp-compile) cat ;;
            *) "$DPP_SHELL" ;;
esac