#!/bin/sh

printf 'Running on '
case $(uname -s) in
  Linux*) echo 'Linux' ;;
  Darwin*) echo 'Mac' ;;
  CYGWIN*|MSYS*|MINGW*) echo 'Windows' ;;
  *) echo 'unknown OS' ;;
esac

os=$(uname -r)
printf 'OS version %s\n' "$os"

arch=$(uname -m)
printf 'Processor architecture %s\n' "$arch"

check() {
  printf 'Looking for %s... ' "$1"
  command -v "$1" || (echo 'not found'; exit 1)
  return $?
}

for FC in ifort gfortran f77; do
  check $FC && break
done
# shellcheck disable=SC2181
if [ $? -ne 0 ]; then
  printf 'Fortran compiler not found. Cannot proceed\n'
  exit 1
else
  printf 'Use %s as Fortran compiler\n' "$FC"
fi

# $FC --version