bat-to-winbash-env.sh

#!/bin/bash

set -eou pipefail

if [[ $# != 1 ]]; then
    echo "Generates a shell script that reproduces the environment variables created by a batch file"
    echo "Usage: $0 <path-to-batch-file>"
    exit 1
fi

d=/tmp/bat-to-winbat-env-$$$RANDOM

# set -x

mkdir $d
cmd //c env > $d/before
cmd //c "$1 && echo CUT HERE && env" > $d/output
sed -n '/^CUT HERE/,$p' $d/output > $d/after

! diff -u $d/before $d/after > $d/diff

perl -ne '
  if (m/^-PATH=(.*)/) {  }
  elsif (m/^\+(.*?)=([^\r\n]*)/) { print "export $1='"'"'$2'"'"'\n" }
  elsif (m/^-[^-!]/) { print "error: unsupported removed variable: $_"; exit 1 }
' $d/diff || { echo Failed >&2; exit 1; }