#!/bin/sh

FILECODE=${1}

DIR="uninitialized"
HIDDEN="uninitialized"
INTERMEDIATE="uninitialized"
PLAIN="uninitialized"
GPGOPTS="uninitialized"
LOG_MSG="The usual."  # Unset this to be prompted at commit time instead.
VCSYS="svn" # default is svn, alternative is 'git' (someday 'hg' if needed)

if [ "${FILECODE}x" = "x" ]; then
  echo "Argument required, one of:"
  echo ""
  echo "   foo  bar  osi"
  echo ""
  exit 1
elif [ "${FILECODE}x" = "foox" ]; then
  DIR="${HOME}/blah/blah/blah/foo"
  HIDDEN="asset-keys.asc"
  INTERMEDIATE="asset-keys"
  PLAIN="a"
  GPGOPTS="ca"
elif [ "${FILECODE}x" = "barx" ]; then
  DIR="${HOME}/private/whatever/bar/private/folder"
  HIDDEN="asset-keys.asc"
  INTERMEDIATE="asset-keys"
  PLAIN="a"
  GPGOPTS="ca"
elif [ "${FILECODE}x" = "osix" ]; then
  DIR="${HOME}/path/to/my/working/copy/of/osi-infra"
  HIDDEN="asset-keys.asc"
  INTERMEDIATE="asset-keys"
  PLAIN="a"
  GPGOPTS="ca"
  unset LOG_MSG
else
  echo "Unrecognized argument '${FILECODE}'."
  exit 1
fi

cd ${DIR}

if [ "${VCSYS}x" = "svnx" ]; then
  svn up ${HIDDEN}
elif [ "${VCSYS}x" = "gitx" ]; then
  git pull  # just get everything; that works fine for our use cases
else
  echo "ERROR Unknown version control system specified: '${VCSYS}'"
  exit 1
fi

gpg -d ${HIDDEN} > ${INTERMEDIATE}

echo ""
DIFFERENCES="no"
if [ -f ${PLAIN} ]; then
  if diff -u ${INTERMEDIATE} ${PLAIN}; then
    echo "No differences."
    rm ${INTERMEDIATE}
  else
    DIFFERENCES="yes"
  fi
else
  echo "Fresh checkout, thus no differences."
  mv ${INTERMEDIATE} ${PLAIN}
fi

if [ "${DIFFERENCES}x" = "yesx" ]; then
  echo ""
  echo -n \
    "(-) for accept upstream, (+) for accept downstream, (n) for neither: "
  read WHICH
  if [ "x${WHICH}x" = "x-x" ]; then
    mv ${INTERMEDIATE} ${PLAIN}
  elif [ "x${WHICH}x" = "x+x" ]; then
    cp ${PLAIN} ${INTERMEDIATE}
    # Kluge conditional because we need to insert an arg in the -ear case.
    if [ ${GPGOPTS} = "ear" ]; then
      gpg -${GPGOPTS} kfogel ${INTERMEDIATE}
    elif [ ${GPGOPTS} = "ca" ]; then
      gpg -${GPGOPTS} ${INTERMEDIATE}
    else
      # Can't happen.
      echo "Unrecognized GnuPG options '${GPGOPTS}'."
      exit 1
    fi
    if [ "${LOG_MSG}x" = "x" ]; then
      # Prompt for log message.
      if [ "${VCSYS}x" = "svnx" ]; then
        svn ci ${HIDDEN}
      elif [ "${VCSYS}x" = "gitx" ]; then
        git add ${HIDDEN}
        git commit ${HIDDEN}
        git push
      else
        echo "ERROR Unknown version control system specified: '${VCSYS}'"
        exit 1
      fi
    else # Use the default log message.
      if [ "${VCSYS}x" = "svnx" ]; then
        svn ci -m "${LOG_MSG}" ${HIDDEN}
      elif [ "${VCSYS}x" = "gitx" ]; then
        git add ${HIDDEN}
        git commit -m "${LOG_MSG}" ${HIDDEN}
        git push
      else
        echo "ERROR Unknown version control system specified: '${VCSYS}'"
        exit 1
      fi
    fi
    rm ${INTERMEDIATE}
  elif [ "x${WHICH}x" = "xnx" ]; then
    echo "No action taken; see '${INTERMEDIATE}' for more."
  else
    echo "ERROR: unrecognized response '${WHICH}'"
    exit 1
  fi
fi

chmod go-rwx ${PLAIN}
emacsclient -n ${PLAIN}