#! /usr/bin/env bash

# Figure out the latest Windows 10 SDK version. Fail if none is found.
#
function windows10_sdkversion ()
{
  # This path will probably always be the same (VC never asks for the SDK
  # installation location).
  #
  local sdk_root="C:\\Program Files (x86)\\Windows Kits\\10"

  # Iterate through $sdk_root/Include subdirectories using the "10.0.NNNNN.0"
  # pattern and choose the (lexicographically) greatest one. Strip the
  # trailing .0 from the selected name and return it as the SDK version.
  #
  # Note that redirecting winepath's stderr to /dev/null is essential to
  # workaround a wineserver bug. If the script's strderr is redirected to
  # stdout, it gets inherited by the shell running winepath and the script
  # caller that reads from the child stdout can hang waiting for EOF until
  # wineserver terminates. For more details on this bug read the related
  # comments in msvc-filter.cxx.
  #
  local sdk_include
  sdk_include="$(winepath -u "$sdk_root/Include" 2>/dev/null)"

  local mxv=
  for d in "$sdk_include/10.0."[0-9][0-9][0-9][0-9][0-9]".0"; do
    #
    # Consider sub-directories only. Note that we can get a false positive if
    # there is no entry that matches the "10.0.NNNNN.0" pattern but the
    # "10.0.[0-9][0-9][0-9][0-9][0-9].0" sub-directory is present. We handle
    # this corner case later by checking the version length.
    #
    if [ -d "$d" ]; then
      local v
      v="$(basename "$d")"
      if [[ "$mxv" < "$v" ]]; then
        mxv="$v"
      fi
    fi
  done

  if [ ${#mxv} -ne 12 ]; then
    error "unable to find Windows 10 SDK in $sdk_root"
  fi

  echo "${mxv:0:10}"
}