#!/bin/sh
# $Id$
# Update TeX4ht font files (.htf). See ./Makefile for invocations.
# Public domain. Originally written by Karl Berry, 2022.

# don't bother with real option parsing.
if test $# -ne 3; then
cat <<END_USAGE
Usage: $0 [ diff | update ] HTF-DEVDIR HTF-INSTDIR
END_USAGE
  exit 1
fi

verbose=true
prg=`basename $0`
cp="cp -pv"
mkdir="mkdir -v"
svn=svn

if test x"$1" = xdiff; then
  shift
  do_updates=false
  cp="echo would $cp"
  mkdir="echo would $mkdir"
  svn="echo would $svn"
elif test x"$1" = xupdate; then
  shift
  do_updates=true
else
  echo "$0: first arg must be \`diff' or \`update', not: $1" >&2
  exit 1
fi

devdir=$1
instdir=$2
tmpdir=/tmp/htdif.d # prefix
rm -rf $tmpdir; mkdir $tmpdir

if test ! -d "$devdir"; then
  echo "$0: devdir not a directory: $devdir" >&2
  exit 1
fi
if test ! -d "$instdir"; then
  echo "$0: instdir not a directory: $instdir" >&2
  exit 1
fi


#  Function to copy SRC to DEST, or fail. Just calls $cp.
# 
copy_file () {
  src=$1; dest=$2
  #
  if $cp "$src" "$dest"; then :; else
    echo "$0: copy ($cp) failed: $src -> $dest" >&2
    exit 1
  fi
}

#  Function to compare SRC to DEST. Return zero if equivalent,
# nonzero if different (or DEST does not exist, etc.).
# 
# Remove a timestamp string from both files for comparison:
# YYYY-MM-DD-HH:MM or just YYYY-MM-DD
# 
htf_same () {
  src=$1; dest=$2;
  #
  src_filtered=$tmpdir/s`basename "$src"`
  dest_filtered=$tmpdir/d`basename "$dest"`
  #
  sed 's/20[0-9][0-9]-[0-9][0-9]-[0-9][0-9]\(-[0-9][0-9]:[0-9][0-9]\)*//' \
      $src >$src_filtered || exit 1
  sed 's/20[0-9][0-9]-[0-9][0-9]-[0-9][0-9]\(-[0-9][0-9]:[0-9][0-9]\)*//' \
      $dest >$dest_filtered || exit 1
  cmp -s "$src_filtered" "$dest_filtered"
}

#  Iterate through all files in the dev directory.
echo "$prg: comparing $devdir"
echo "$prg:        to $instdir"
>$tmpdir/0 # accumulate diffs here
#
find "$devdir" -type f -print | sort | while read devf; do
  instf=`echo "$devf" | sed "s,^$devdir/,$instdir/,"`
  #echo "$devf" | grep ec-mlm >/dev/null &&
  #$verbose && echo "considering $devf -> $instf"
  
  if test -r "$instf"; then
    # we have a file in both directories; see if they are the same (enough).
    if htf_same "$devf" "$instf"; then
      : # $verbose && echo "`basename \"$devf\"`: same ($devf == $instf)"
    else
      $verbose && echo "`basename \"$devf\"`: diff ($devf != $instf)"
      # save diff from (older) DEST to newer (SRC).
      diff -u0 "$dest" "$src" >>$tmpdir/0
      #
      copy_file "$devf" "$instf"
    fi

  else
    # no destination file. see if we have the containing directory.
    destdirf=`dirname "$instf"`
    if test -d "$destdirf"; then
      # have directory, so add file.
      $verbose && echo "newfile ($devf -> $instf)"
      copy_file "$devf" "$instf"
      $svn add "$instf" || exit 1
    else
      # don't even have directory. create it, then copy file.
      $mkdir "$destdirf"
      $verbose && echo "newdir ($devf -> $destdirf)"
      if test ! -d "$destdirf"; then
        echo "$0: could not make dest dir: $destdirf (for $devf->$instf)" >&2
        exit 1
      fi
      $svn add "$destdirf" || exit 1
      copy_file "$devf" "$instf"
      $svn add "$instf" || exit 1
    fi
  fi
done

#  check for extra files in $instdir
(cd "$devdir" && find . -type f -print | sort) >$tmpdir/devdir || exit 1
(cd "$instdir" && find . -type f -print | sort) >$tmpdir/instdir || exit 1

echo "$prg: files in devdir and not in instdir (should be empty):"
comm -23 $tmpdir/devdir $tmpdir/instdir

echo "$prg: files in instdir and not in devdir (you should remove):"
comm -13 $tmpdir/devdir $tmpdir/instdir
# maybe better to leave it for manual removal?

#  also copy source files.
t4srcdir=`echo "$instdir" \
          | sed 's,/texmf-dist/.*,/texmf-dist/source/generic/tex4ht,'`
echo "$prg: copying source files to $t4srcdir."
cp -p ChangeLog Makefile tex4ht-fonts*.tex update-htfonts "$t4srcdir"

echo
(set -x;
 $svn status "$instdir"
 $svn status "$t4srcdir"
)

echo "$prg: done."