Interlisp.medley/scripts/loadups/thin_loadups.sh

#!/bin/sh
#
#  Thin the Medley loadups and loadups/build directories by deleting all but the latest version.
#
#  2025-04-18 Frank Halasz
#

main() {

    #shellcheck source=./loadup-setup.sh
    . "${LOADUP_SCRIPTDIR}"/loadup-setup.sh

    if [ "$1" = "w" ] || [ "$1" = "lw" ] || [ "$1" = "wl" ]
    then
      if [ ! "$2" = "+" ]
      then
        find "${LOADUP_WORKDIR}" -name "*.~[0-9]*~" -delete
      else
        rm -rf "${LOADUP_WORKDIR}"/*
        if istagged "${LOADUP_WORKDIR}"
        then
          rm -rf "${LOADUP_WORKDIR}"
          if istagged "${LOADUP_OUTDIR}" && [ -z "$(ls -a -1 "${LOADUP_OUTDIR}" | tail +3)" ]
          then
            rmdir "${LOADUP_OUTDIR}"
          fi
        fi
      fi
    fi
    if [ "$1" = "l" ] || [ "$1" = "lw" ] || [ "$1" = "wl" ]
    then
      if [ ! "$2" = "+" ]
      then
        find "${LOADUP_OUTDIR}" -name "$(basename "${LOADUP_WORKDIR}")" -prune \
                                -o -name "*.~[0-9]*~" -exec rm -f {} \;
      else
        find "${LOADUP_OUTDIR}" \( -name "$(basename "${LOADUP_WORKDIR}")" -prune \) \
                                -o -path "${LOADUP_OUTDIR}" \
                                -o -exec rm -rf {} \;  2>&1 >/dev/null  \
              | grep -v "No such file"
        if istagged "${LOADUP_OUTDIR}" && [ ! -e "${LOADUP_WORKDIR}" ]
        then
          rm -rf "${LOADUP_OUTDIR}"
        fi
      fi
    fi
}



istagged() {
  echo "$1" | grep -q "^${MEDLEYDIR}/loadups/tagged"
  return $?
}


# shellcheck disable=SC2164,SC2034
if [ -z "${LOADUP_SCRIPTDIR}" ]
then
	#
	#
	# Some functions to determine what directory this script is being executed from
	#
	#
	get_abs_filename() {
	  # $1 : relative filename
	  echo "$(cd "$(dirname "$1")" && pwd)/$(basename "$1")"
	}

	# This function taken from
	# https://stackoverflow.com/questions/29832037/how-to-get-script-directory-in-posix-sh
	rreadlink() (

	  # Execute this function in a *subshell* to localize variables and the effect of `cd`.

	  target=$1
	  fname=
	  targetDir=
	  CDPATH=

	  # Try to make the execution environment as predictable as possible:
	  # All commands below are invoked via `command`, so we must make sure that `command`
	  # itself is not redefined as an alias or shell function.
	  # (Note that command is too inconsistent across shells, so we don't use it.)
	  # `command` is a *builtin* in bash, dash, ksh, zsh, and some platforms do not even have
	  # an external utility version of it (e.g, Ubuntu).
	  # `command` bypasses aliases and shell functions and also finds builtins 
	  # in bash, dash, and ksh. In zsh, option POSIX_BUILTINS must be turned on for that
	  # to happen.
	  { \unalias command; \unset -f command; } >/dev/null 2>&1
	  [ -n "$ZSH_VERSION" ] && options[POSIX_BUILTINS]=on # make zsh find *builtins* with `command` too.

	  while :; do # Resolve potential symlinks until the ultimate target is found.
	      [ -L "$target" ] || [ -e "$target" ] || { command printf '%s\n' "ERROR: '$target' does not exist." >&2; return 1; }
	      command cd "$(command dirname -- "$target")" # Change to target dir; necessary for correct resolution of target path.
	      fname=$(command basename -- "$target") # Extract filename.
	      [ "$fname" = '/' ] && fname='' # !! curiously, `basename /` returns '/'
	      if [ -L "$fname" ]; then
	        # Extract [next] target path, which may be defined
	        # *relative* to the symlink's own directory.
	        # Note: We parse `ls -l` output to find the symlink target
	        #       which is the only POSIX-compliant, albeit somewhat fragile, way.
	        target=$(command ls -l "$fname")
	        target=${target#* -> }
	        continue # Resolve [next] symlink target.
	      fi
	      break # Ultimate target reached.
	  done
	  targetDir=$(command pwd -P) # Get canonical dir. path
	  # Output the ultimate target's canonical path.
	  # Note that we manually resolve paths ending in /. and /.. to make sure we have a normalized path.
	  if [ "$fname" = '.' ]; then
	    command printf '%s\n' "${targetDir%/}"
	  elif  [ "$fname" = '..' ]; then
	    # Caveat: something like /var/.. will resolve to /private (assuming /var@ -> /private/var), i.e. the '..' is applied
	    # AFTER canonicalization.
	    command printf '%s\n' "$(command dirname -- "${targetDir}")"
	  else
	    command printf '%s\n' "${targetDir%/}/$fname"
	  fi
	)

	get_script_dir() {

	    # call this with $0 (from main script) as its (only) parameter
	    # if you need to preserve cwd, run this is a subshell since
	    # it can change cwd

	    # set -x

	    local_SCRIPT_PATH="$( get_abs_filename "$1" )";

	    while [ -h "$local_SCRIPT_PATH" ];
	    do
	        cd "$( dirname -- "$local_SCRIPT_PATH"; )";
	        local_SCRIPT_PATH="$( rreadlink "$local_SCRIPT_PATH" )";
	    done

	    cd "$( dirname -- "$local_SCRIPT_PATH"; )" > '/dev/null';
	    local_SCRIPT_PATH="$( pwd; )";

	    # set +x

	    echo "${local_SCRIPT_PATH}"
	}

	# end of script directory functions
	###############################################################################

        # figure out the script dir
        LOADUP_SCRIPTDIR="$(get_script_dir "$0")"
	export LOADUP_SCRIPTDIR

fi

main "$@"