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# Copyright (c) 2017 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Johnny C. Lam.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# NAME
# dirwalk.subr -- walk a directory tree using depth-first traversal
#
# SYNOPSIS
# task_dirwalk [-d | -f] path
#
# DESCRIPTION
# The task_dirwalk function walks the filesystem starting at the given
# path and outputs the contents using depth-first traversal.
#
# The options are as follows:
#
# -d Only output the directory entries.
#
# -f Only output non-directory entries (files, symlinks, etc).
#
# RETURN VALUES
# Returns 0 on success, and >0 if an error occurs.
#
# ENVIRONMENT
# The following variables are used if they are set:
#
# FIND The name or path to the find(1) utility.
#
__task_dirwalk__="yes"
task_load quote
task_dirwalk()
{
: ${FIND:=find}
local output="all"
local arg
local OPTIND=1
while getopts ":df" arg "$@"; do
case $arg in
d) case $output in
all) output="dirs" ;;
*) return 127 ;;
esac ;;
f) case $output in
all) output="files" ;;
*) return 127 ;;
esac ;;
*) return 127 ;;
esac
done
shift $(( ${OPTIND} - 1 ))
[ $# -gt 0 ] || return 127
[ -e "$1" ] || return 0
if [ ! -d "$1" ]; then
case $output in
files) echo "$1" ;;
esac
return 0
fi
# Use find(1) if it is present.
case $output in
all) { ${FIND} "$1" -print; } 2>/dev/null ;;
dirs) { ${FIND} "$1" -type d -print; } 2>/dev/null ;;
files) { ${FIND} "$1" \! -type d -print; } 2>/dev/null ;;
esac
[ $? -gt 0 ] || return 0
( cwd=
set -- "$1"
while [ $# -gt 0 ]; do
# Pop the top entry off the front of the stack and print it.
top=$1; shift
if [ "$top" = "__EOD__" ]; then
cd ..
case $cwd in
*/*) cwd=${cwd%/*} ;;
*) cwd= ;;
esac
continue
fi
case $cwd in
"") path=$top ;;
*) path="$cwd/$top" ;;
esac
case $output in
all) echo "$path" ;;
dirs) if [ ! -h "$top" -a -d "$top" ]; then
echo "$path"
fi ;;
files) if [ ! -h "$top" -a -d "$top" ]; then
: "directory"
else
echo "$path"
fi ;;
esac
# Push all entries in the directory onto the stack.
if [ ! -h "$top" -a -d "$top" ]; then
cd "$top" 2>/dev/null || continue
cwd=$path
stack=
# XXX This expansion could break with too many files.
for entry in .* *; do
case $entry in
.|..) continue ;;
".*"|"*")
break ;;
esac
task_quote "$entry"
stack="$stack $quoted"
done
case $stack in
"") stack="__EOD__" ;;
*) stack="$stack __EOD__" ;;
esac
task_quote "$@"
eval set -- $stack $quoted
fi
done )
}
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