Convert Visual Studio environment variables to bash for use in mingw (also run in mingw)

convert-vcvars-to-shell.sh

#! /usr/bin/env bash
#
#   Copyright (c) 2023 Nat! - Mulle kybernetiK
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#
#
# This script is for use in MINGW. Grabs the environment variables you need from
# VS Studio prompt and adds them to your mulle-sde environment.
#
OUTPUT_FORMAT="${1:-echo}"

echo "Provide the output of \"set\" from the \"Native Tools Command Prompt for VS\" as stdin..." >&2

settings="`grep -E 'Visual\ Studio|WindowsSDK' `"

r_convert_path()
{
   RVAL=

   old="${IFS}"
   IFS=";"
   for item in $1
   do
      if [ -z "${item}" ]
      then
         continue
      fi

      converted="`cygpath.exe "${item}" `"
      if [ -z "${RVAL}" ]
      then
         RVAL="${converted}"
      else
         RVAL="${RVAL}:${converted}"
      fi
   done
   IFS="${old}"
}


set -f
IFS=$'\n'

for line in ${settings}
do
   key="${line%%=*}"
   value="${line#*=}"

   # convert multipath or singlepath
   case "${value}" in 
      *:\\*\;*)
         r_convert_path "${value}"
         value="${RVAL}"  
      ;; 

      *:\\*)
         value="`cygpath.exe "${value}"`"
      ;;

      # for WindowsSDKVersion and WindowsSDKLibVersion, hmmm
      *\\)
         value="${value//\\//}"
      ;;
   esac

   case "${key}" in 
      Path)
         key='PATH'
         value="${value}:\${PATH}"
      ;;
   esac

   # escape for output (or use printf -q)
   value="${value//\"/\\\"}"

   case "${OUTPUT_FORMAT}" in 
      echo)
         echo "${key}=\"${value}\""
      ;;

      mulle-sde-echo)
         echo mulle-sde environment --this-os set "${key}" "\"${value}\""
      ;;

      mulle-sde)
         # could, should use mset here
         mulle-sde environment --this-os set "${key}" "${value}"
      ;;
   esac
done