#!/bin/bash -e

# last updated 2025-01-29 by mza

# find -printf:
# %u = user
# %g = group
# %M = rwxr-x---
# %s = size
# %p = name
# %l = target of symlink
# %TY-%Tm-%Td+%TH:%TM = modification datestamp

declare DATESTAMP='%TY-%Tm-%Td+%TH:%TM'
declare USERGROUP='%7u:%-7g'
declare PERMISSIONS='%M'
declare SIZE='%12s'

#declare REGULAR_FILE_STRING=$DATESTAMP' '$USERGROUP' '$PERMISSIONS' '$SIZE' %p\n'
declare BASE="$DATESTAMP $SIZE %p"
declare REGULAR_FILE_STRING=""
declare REGULAR_DIR_STRING=""
declare SYMLINK_STRING=""
declare SORT_STRING=""

# defaults:
declare -i showdir=0
declare -i showsymlink=0
declare -i showusergroup=0
declare -i showpermissions=0
declare -i shouldsort=1

if [ $# -gt 0 ]; then
	for each; do
		if [ "${each:0:1}" == "-" ]; then
			if [ "${each}" != "${each/d/}" ]; then
				showdir=1
			fi
			if [ "${each}" != "${each/l/}" ]; then
				showsymlink=1
			fi
			if [ "${each}" != "${each/u/}" ]; then
				showusergroup=1
			fi
			if [ "${each}" != "${each/p/}" ]; then
				showpermissions=1
			fi
			if [ "${each}" != "${each/s/}" ]; then
				shouldsort=0
			fi
			shift
		else
			break;
		fi
	done
fi

if [ $showusergroup -gt 0 ]; then
	if [ $showpermissions -gt 0 ]; then
		BASE="$DATESTAMP $USERGROUP $PERMISSIONS $SIZE %p"
	else
		BASE="$DATESTAMP $USERGROUP $SIZE %p"
	fi
elif [ $showpermissions -gt 0 ]; then
	BASE="$DATESTAMP $PERMISSIONS $SIZE %p"
fi

REGULAR_FILE_STRING="$BASE\n"

if [ $showdir -gt 0 ]; then
	REGULAR_DIR_STRING="$BASE/\n"
else
	REGULAR_DIR_STRING=""
fi

if [ $showsymlink -gt 0 ]; then
	SYMLINK_STRING="$BASE -> %l\n"
else
	SYMLINK_STRING=""
fi

if [ $shouldsort -gt 0 ]; then
	SORT_STRING='sort -k1n'
else
	SORT_STRING='cat'
fi
# a second -k 3 should then sort by filename to break ties, but it doesn't seem to work

# page 421 of "bash Cookbook" is helpful here
find "${@}" \
	-type d \( -name "proc" -o -name "dev" -o -name "\.svn" -o -name "\.git" -o -name "\@eaDir" \) -prune \
	-o -type d -printf "$REGULAR_DIR_STRING" \
	-o -type l -printf "$SYMLINK_STRING" \
	-o         -printf "$REGULAR_FILE_STRING" \
	| $SORT_STRING