#! /bin/bash

usage() {
  echo "usage: $0 --platform=<platform> [options...]"
  echo ""
  echo "Available platforms:"

  for file in config/*.cfg; do
    platform="${file#config/}"
    platform="${platform%.cfg}"

    printf '  %-10s' "$platform"
    head -1 "$file" | sed 's/^# *//'
  done

  echo ""
  echo "Options for fx9860g and fxcg50:"
  echo "  --toolchain=<toolchain>"
  echo "    Target triplet; default is 'sh3eb-elf' for fx9860g and 'sh4eb-elf'"
  echo "    for fxcg50"
  echo "  --prefix=<path>"
  echo "    Library install path, guessed automatically by asking the compiler"
  echo "    if not specified"

  exit ${1:-1}
}

platform=
toolchain=

# Parse command-line arguments

for arg in "$@"; do case "$arg" in
  -h|--help|"-?")
    usage 0;;
  --platform=*)
    platform=${arg#*=};;
  --toolchain=*)
    toolchain=${arg#*=};;
  --prefix=*)
    prefix=${arg#*=};;
  *)
    echo "error: unrecognized option '$arg'" 2>&1
    error=1;;
esac; done

# Check validity

if [ -z "$platform" ]; then
  echo "error: please specify a platform" 2>&1
  echo "Try '$0 --help' for more information."
  exit 1
fi

if [ ! -f "config/$platform.cfg" ]; then
  echo "error: unknown platform '$platform'" 2>&1
  echo "Try '$0 --help' for a list of available platforms."
  exit 1
fi

# Guess toolchains

[[ $platform == fx9860g && -z $toolchain ]] && toolchain=sh-elf
[[ $platform == fxcg50  && -z $toolchain ]] && toolchain=sh-elf

# Guess compiler paths

if [[ ( $platform == fx9860g || $platform == fxcg50 ) && -z $prefix ]]; then
  echo "No prefix specified, let's ask the compiler:"
  echo "  $toolchain-gcc --print-search-dirs | grep install | sed 's/install: //'"
  inst=$($toolchain-gcc --print-search-dirs | grep install | sed 's/install: //')

  if [[ $? != 0 ]]; then
    echo "Call returned $?, giving up."
  fi

  echo "Got '$inst'".

  if [[ ! -d $inst ]]; then
    echo "Directory does not exist (or is not a directory), giving up."
  fi

  echo ""
  prefix=$inst
fi

# Output configuration

output_config() {
  echo "PLATFORM=$platform"

  if [[ $platform == fx9860g || $platform == fxcg50 ]]; then
    echo "TOOLCHAIN=$toolchain"
    echo "PREFIX=$prefix"
  fi
}

output_config > Makefile.cfg
echo "Makefile.cfg now links to the platform file 'config/$platform.cfg'."