dust

#!/bin/env sh

# POSIX-compliant script for setting up your shell
thisdir=$(realpath $(dirname $0))
DUSTDIR=${thisdir}/dustenv
PYENVDIR=${DUSTDIR}/pyenv
. ${DUSTDIR}/pyenv-source.sh
. ${DUSTDIR}/common.sh

# setup_pypackages() {
#   export PYTHONPATH="$(pyenv prefix)/lib:$PYTHONPATH"
# }

# backup status of installed packages for later
# pypackages_before=$(ls -lR ${thisdir}/__pypackages__/ 2>/dev/null)
pyenv_before=$(ls -lR $(pyenv prefix)/lib/ 2>/dev/null)

# special command: add
if test "$1" = "add"
then
  # setup_pypackages
  pyenv exec pdm add --no-sync "${@:2}"
  dust_sync
  check_changes=0
elif test "$1" = "remove"
then
  # setup_pypackages
  pyenv exec pdm remove --no-sync "${@:2}"
  dust_sync
  check_changes=0
elif test "$1" = "update"
then
  # setup_pypackages
  pyenv exec pdm update --no-sync "${@:2}"
  dust_sync
  check_changes=0
elif test "$1" = "sync"
then
  dust_sync "${@:2}"
  check_changes=0
elif test "$1" = "pdm"
then
  pyenv exec pdm "${@:2}"
  dust_sync
  check_changes=0
elif test "$1" = "exec"
then
  pyenv exec "${@:2}"
  check_changes=1
elif test "$1" = "shell"
then
  shell=$(cat /proc/$PPID/comm)
  # removing link (e.g. sh -> /usr/bin/bash)
  shell=$(basename $(realpath $(which $shell))) 
  # shell_command=$(cat /proc/$PPID/cmdline)
  # setup_pypackages $mode
  if test "$shell" = "fish"
  then
    pyenv exec $shell -C "source ${DUSTDIR}/pyenv-source.fish $PYENVDIR"
  elif test "$shell" = "bash" 
  then
    # <() is not posix-compliant, need to use a named pipe here
    pipe_name=temp_pipe.$$
    mkfifo $pipe_name
    echo "source ${DUSTDIR}/pyenv-source.sh" > $pipe_name & pyenv exec $shell --init-file $pipe_name
    rm $pipe_name
  else
    echo "Sorry, we cannot spawn your shell: only fish and bash supported."
  fi
else
  # setup_pypackages
  pyenv exec python "$@"
  check_changes=1
fi

# check if some package was modified
if [ "$check_changes" = "1" ]
then
  pyenv_after=$(ls -lR $(pyenv prefix)/lib/ 2>/dev/null)
  if  [ "$pyenv_after" != "$pyenv_before" ]; then
    if ask_yn "DUST MESSAGE: Detected changes, do you want that we update requirements.txt and pyproject.toml? This will produce a very long and meaningless pyproject.toml! [y/n]"
    then
      dust_pip_export
      dust_pdm_import
      dust_pip_install
    fi
  fi
fi

if test $ERROR
then
  echo "Some error happened! Have you run 'install.sh'?"
  exit 1
fi