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#! /bin/sh
# Lzdiff - Diff/cmp wrapper for compressed files.
# Copyright (C) 2008, 2009 Antonio Diaz Diaz.
#
# This script is free software: you have unlimited permission
# to copy, distribute and modify it.
LC_ALL=C
export LC_ALL
invocation_name=$0
args=
default_ext=.lz
diff_prog=diff
file1=
file2=
# Loop over args
while [ x"$1" != x ] ; do
case "$1" in
--help | --he* | -h)
echo "Lzdiff - Diff/cmp wrapper for compressed files."
echo
echo "Lzdiff is a wrapper script around the diff and cmp commands that allows"
echo "transparent comparison of any combination of compressed and"
echo "non-compressed files. If any given file is compressed, its uncompressed"
echo "content is used. The supported compressors are gzip, bzip2 and lzip."
echo
echo "Usage: ${invocation_name} [OPTIONS] [DIFF_OPTIONS] FILE1 [FILE2]"
echo
echo "Compares FILE1 to FILE2. If FILE2 is omitted, compares FILE1 to the"
echo "uncompressed contents of FILE1.[gz|bz2|lz] (depending on the default"
echo "compressor selected). DIFF_OPTIONS are passed directly to diff or cmp."
echo "The exit status from diff or cmp is preserved."
echo
echo "Options:"
echo " -h, --help display this help and exit"
echo " -V, --version output version information and exit"
echo " --gzip use gzip as default decompressor"
echo " --bzip2 use bzip2 as default decompressor"
echo " --lzip use lzip as default decompressor (default)"
echo " --diff use diff to compare files (default)"
echo " --cmp use cmp to compare files"
echo
echo "Report bugs to lzip-bug@nongnu.org"
echo "Lzip home page: http://www.nongnu.org/lzip/lzip.html"
exit 0 ;;
--version | --ve* | -V)
echo "Lzdiff 0.5"
echo "Copyright (C) 2009 Antonio Diaz Diaz."
echo "This script is free software: you have unlimited permission"
echo "to copy, distribute and modify it."
exit 0 ;;
--gz*)
default_ext=.gz ;;
--bz*)
default_ext=.bz2 ;;
--lz*)
default_ext=.lz ;;
--diff)
diff_prog=diff ;;
--cmp)
diff_prog=cmp ;;
-)
echo "${invocation_name}: reading from stdin not supported"
exit 1 ;;
--)
;;
-?*)
args="${args} $1" ;;
*)
if test -f "$1"; then
if test -z "${file1}"; then file1="$1"
else
if test -z "${file2}"; then file2="$1"
else
echo "${invocation_name}: Too many files; use --help for usage." 1>&2
fi
fi
else
echo "${invocation_name}: File \"$1\" not found or not a regular file" 1>&2
exit 1
fi ;;
esac
shift
done
if test -z "${file1}"; then
echo "${invocation_name}: No files given; use --help for usage." 1>&2
exit 1
fi
if test -z "${file2}"; then
case "${file1}" in
*.gz)
file2=`printf "%s" "${file1}" | sed 's/.gz$//'` ;;
*.tgz)
file2=`printf "%s" "${file1}" | sed 's/tgz$/tar/'` ;;
*.bz2)
file2=`printf "%s" "${file1}" | sed 's/.bz2$//'` ;;
*.tbz)
file2=`printf "%s" "${file1}" | sed 's/tbz$/tar/'` ;;
*.tbz2)
file2=`printf "%s" "${file1}" | sed 's/tbz2$/tar/'` ;;
*.lz)
file2=`printf "%s" "${file1}" | sed 's/.lz$//'` ;;
*.tlz)
file2=`printf "%s" "${file1}" | sed 's/tlz$/tar/'` ;;
*)
file2="${file1}${default_ext}" ;;
esac
fi
prog1=
prog2=
case "${file1}" in
*.gz | *.tgz) prog1=gzip ;;
*.bz2 | *.tbz | *.tbz2) prog1=bzip2 ;;
*.lz | *.tlz) prog1=lzip ;;
esac
case "${file2}" in
*.gz | *.tgz) prog2=gzip ;;
*.bz2 | *.tbz | *.tbz2) prog2=bzip2 ;;
*.lz | *.tlz) prog2=lzip ;;
esac
retval=0
if test -n "${prog1}"; then
if test -n "${prog2}"; then
tmp_file=`mktemp "${TMPDIR:-/tmp}"/lzdiff.XXXXXXXXXX` || {
echo 'cannot create a temporary file' 1>&2
exit 1
}
${prog2} -cdfq "${file2}" > "${tmp_file}" || exit 1
${prog1} -cdfq "${file1}" | ${diff_prog} ${args} - "${tmp_file}"
retval=$?
rm -f "${tmp_file}" || retval=$?
else
${prog1} -cdfq "${file1}" | ${diff_prog} ${args} - "${file2}"
retval=$?
fi
else
if test -n "${prog2}"; then
${prog2} -cdfq "${file2}" | ${diff_prog} ${args} "${file1}" -
retval=$?
else
${diff_prog} ${args} "${file1}" "${file2}"
retval=$?
fi
fi
exit ${retval}
|
