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-rw-r--r--zdiff.in160
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-#! /bin/sh
-# Zdiff - 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
-args=
-diff_prog=diff
-file1=
-file2=
-two_hyphens=0
-
-# Loop over args
-while [ -n "$1" ] ; do
-
- case "$1" in
- --help | --he* | -h)
- echo "Zdiff - Diff/cmp wrapper for compressed files."
- echo
- echo "Zdiff 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 bzip2, gzip, lzip and xz."
- echo
- echo "Zcmp is a shortcut for \"zdiff --cmp\""
- echo
- echo "Usage: $0 [OPTIONS] [DIFF_OPTIONS] FILE1 [FILE2]"
- echo
- echo "Compares FILE1 to FILE2. If FILE2 is omitted and FILE1 is compressed,"
- echo "compares FILE1 to the file with the corresponding decompressed file"
- echo "name (removes the extension from FILE1). If FILE2 is omitted and FILE1"
- echo "is not compressed, compares FILE1 to the uncompressed contents of"
- echo "FILE1.[bz2|gz|lz|xz] (the first one that is found)."
- echo "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 " --diff use diff to compare files (default)"
- echo " --cmp use cmp to compare files"
- echo
- echo "Report bugs to zutils-bug@nongnu.org"
- echo "Zutils home page: http://www.nongnu.org/zutils/zutils.html"
- exit 0 ;;
- --version | --ve* | -V)
- echo "Zdiff (zutils) VERSION"
- 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 ;;
- --diff)
- diff_prog=diff ;;
- --cmp)
- diff_prog=cmp ;;
- -)
- echo "$0: reading from stdin not supported"
- exit 1 ;;
- --)
- shift; two_hyphens=1 ; break ;;
- -?*)
- args="${args} $1" ;;
- *)
- break ;;
- esac
- shift
-done
-
-# Loop over files
-for i in "$@" ; do
- if [ "$i" = "--" ] && [ ${two_hyphens} = 0 ] ; then two_hyphens=1
- else
- if [ -f "$i" ] ; then
- if [ -z "${file1}" ] ; then file1="$i"
- else
- if [ -z "${file2}" ] ; then file2="$i"
- else
- echo "$0: Too many files; use --help for usage." 1>&2
- fi
- fi
- else
- echo "$0: File \"$i\" not found or not a regular file" 1>&2
- exit 1
- fi
- fi
-done
-
-if [ -z "${file1}" ] ; then
- echo "$0: No files given; use --help for usage." 1>&2
- exit 1
-fi
-
-if [ -z "${file2}" ] ; then
- case "${file1}" in
- *.bz2) file2=`printf "%s" "${file1}" | sed -e 's,.bz2$,,'` ;;
- *.tbz) file2=`printf "%s" "${file1}" | sed -e 's,tbz$,tar,'` ;;
- *.tbz2) file2=`printf "%s" "${file1}" | sed -e 's,tbz2$,tar,'` ;;
- *.gz) file2=`printf "%s" "${file1}" | sed -e 's,.gz$,,'` ;;
- *.tgz) file2=`printf "%s" "${file1}" | sed -e 's,tgz$,tar,'` ;;
- *.lz) file2=`printf "%s" "${file1}" | sed -e 's,.lz$,,'` ;;
- *.tlz) file2=`printf "%s" "${file1}" | sed -e 's,tlz$,tar,'` ;;
- *.xz) file2=`printf "%s" "${file1}" | sed -e 's,.xz$,,'` ;;
- *.txz) file2=`printf "%s" "${file1}" | sed -e 's,txz$,tar,'` ;;
- *)
- if [ -f "${file1}.bz2" ] ; then file2="${file1}.bz2"
- elif [ -f "${file1}.gz" ] ; then file2="${file1}.gz"
- elif [ -f "${file1}.lz" ] ; then file2="${file1}.lz"
- elif [ -f "${file1}.xz" ] ; then file2="${file1}.xz"
- else
- echo "$0: Compressed version of ${file1} not found; use --help for usage." 1>&2
- exit 1
- fi ;;
- esac
-fi
-
-prog1=
-prog2=
-bindir=`echo "$0" | sed -e 's,[^/]*$,,'`
-if [ -f "${file1}" ] ; then
- prog_name=`"${bindir}"zutils -t -- "${file1}"`
- case "${prog_name}" in
- bzip2 | gzip | lzip | xz) prog1=${prog_name} ;;
- esac
-fi
-if [ -f "${file2}" ] ; then
- prog_name=`"${bindir}"zutils -t -- "${file2}"`
- case "${prog_name}" in
- bzip2 | gzip | lzip | xz) prog2=${prog_name} ;;
- esac
-fi
-
-retval=0
-if [ -n "${prog1}" ] ; then
- if [ -n "${prog2}" ] ; then
- tmp_file=`mktemp "${TMPDIR:-/tmp}"/zdiff.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=$?
- fi
-else
- if [ -n "${prog2}" ] ; then
- ${prog2} -cdfq -- "${file2}" | ${diff_prog} ${args} -- "${file1}" -
- retval=$?
- else
- ${diff_prog} ${args} -- "${file1}" "${file2}"
- retval=$?
- fi
-fi
-
-exit ${retval}