#!/bin/sh
# Check GNU m4 against examples from the manual source.
# Copyright (C) 1992, 2006-2014, 2016-2017, 2020-2021 Free Software
# Foundation, Inc.
#
# This file is part of GNU M4.
#
# GNU M4 is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# GNU M4 is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

# Clean up temp files on exit
pwd=`pwd`
tmp=m4-tmp.$$
trap 'stat=$?; cd "$pwd"; rm -rf $tmp && exit $stat' 0
trap '(exit $?); exit $?' 1 2 13 15

# Create scratch dir
framework_failure=0
mkdir $tmp || framework_failure=1

if test $framework_failure = 1; then
  echo "$0: failure in testing framework" 1>&2
  (exit 1); exit 1
fi

out=$tmp/m4-out
err=$tmp/m4-err
xout=$tmp/m4-xout
xerr=$tmp/m4-xerr
failed=
skipped=
strip_needed=false
diffopts=-c

# Allow user to select sed
: ${SED=sed}

# Find out where the examples live.
examples=.
if test "x$1" = x-I ; then
  examples="$2"
  shift; shift
fi

# Find out how to run m4.
m4=m4
if test "x$1" = x-m ; then
  m4="$2"
  shift; shift
fi

# Find out how the executable prints argv[0]
m4name=`"$m4" --help | ${SED} -e 's/Usage: \(.*\) \[OPTION.*/\1/' \
  -e 's/\\\\/\\\\\\\\/g' -e 1q`

# Find out if we should strip \r in the output
"$m4" --version | tee $out
"$m4" --version | tr -d '\015' > $xout
if cmp -s $out $xout; then
  :
else
  echo "Ignoring carriage returns"
  strip_needed=:
fi

# Find out if diff supports useful options.
if diff -u /dev/null /dev/null 2>/dev/null ; then
  diffopts="-u"
fi
if diff -a /dev/null /dev/null 2>/dev/null ; then
  diffopts="$diffopts -a"
fi

# Run the tests.
for file
do
  test -f "$file" || {
    echo "No such file: $file"
    continue
  }
  echo "Checking $file"

  case $file in
    *stackovf.test)
      "$file" "$m4"
      case $? in
        77) skipped="$skipped $file";;
        0) ;;
        *) failed="$failed $file"
      esac
      continue ;;
  esac

  options=`${SED} -ne '3s/^dnl @ extra options: //p;3q' "$file"`
  ${SED} -e '/^dnl @/d' -e '/^\^D$/q' "$file" \
    | LC_MESSAGES=C M4PATH=$examples "$m4" -d $options - >$out 2>$err
  stat=$?

  xstat=`${SED} -ne '2s/^dnl @ expected status: //p;2q' "$file"`
  case $stat in
    77)
      skipped="$skipped $file"
      cat $err
      continue
      ;;
    $xstat) ;;
    *)
      failed="$failed $file:status"
      echo `${SED} -e 's/^dnl //' -e 1q $file`
      echo "$file: status was $stat, expected $xstat"
      ;;
  esac

  xoutfile=`${SED} -n 's/^dnl @ expected output: //p' "$file"`
  if test -z "$xoutfile" ; then
    ${SED} -e '/^dnl @result{}/!d' -e 's///' -e "s|examples/|$examples/|" \
      "$file" > $xout
  else
    cp "$examples/$xoutfile" $xout
  fi

  xerrfile=`${SED} -n 's/^dnl @ expected error: //p' "$file"`
  case $xerrfile in
    ignore)
      cp $err $xerr ;;
    '')
      ${SED} '/^dnl @error{}/!d
           s///; '"s|^m4:|$m4name:|; s|examples/|$examples/|" \
        "$file" > $xerr ;;
    *)
      ${SED} "s|^m4:|$m4name:|; s|examples/|$examples/|" \
        "$examples/$xerrfile" > $xerr ;;
  esac

  # For the benefit of mingw, normalize \r\n line endings
  if $strip_needed ; then
    tr -d '\015' < $out > $out.t
    mv $out.t $out
    tr -d '\015' < $xout > $xout.t
    mv $xout.t $xout
    tr -d '\015' < $err > $err.t
    mv $err.t $err
    tr -d '\015' < $xerr > $xerr.t
    mv $xerr.t $xerr
  fi

  if cmp -s $out $xout; then
    :
  else
    failed="$failed $file:out"
    echo `${SED} -e 's/^dnl //' -e 1q $file`
    echo "$file: stdout mismatch"
    diff $diffopts $xout $out
  fi

  if cmp -s $err $xerr; then
    :
  else
    failed="$failed $file:err"
    echo `${SED} -e 's/^dnl //' -e 1q $file`
    echo "$file: stderr mismatch"
    diff $diffopts $xerr $err
  fi

done

rm -f $out $err $xout $xerr

echo
if test -n "$skipped"; then
  echo "Skipped checks were:"
  echo " $skipped"
fi
if test -z "$failed"; then
  echo "All checks successful"
  stat=0
else
  echo "Failed checks were:"
  echo " $failed"
  stat=1
fi
(exit $stat); exit $stat
