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Diffstat (limited to 'zdiff.in')
| -rw-r--r-- | zdiff.in | 171 |
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diff --git a/zdiff.in b/zdiff.in new file mode 100644 index 0000000..4be41d8 --- /dev/null +++ b/zdiff.in @@ -0,0 +1,171 @@ +#! /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 +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 "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 gzip, bzip2, lzip and xz." + echo + echo "Zcmp is a shortcut for \"zdiff --cmp\"" + echo + echo "Usage: ${invocation_name} [OPTIONS] [DIFF_OPTIONS] FILE1 [FILE2]" + echo + echo "Compares FILE1 to FILE2. If FILE2 is omitted, compares FILE1 to the" + echo "uncompressed contents of FILE1.[gz|bz2|lz] (depending on the default" + echo "compressor selected). DIFF_OPTIONS are passed directly to diff or cmp." + echo "The exit status from diff or cmp is preserved." + echo + echo "Options:" + echo " -h, --help display this help and exit" + echo " -V, --version output version information and exit" + echo " --gzip use gzip as default decompressor" + echo " --bzip2 use bzip2 as default decompressor" + echo " --lzip use lzip as default decompressor (default)" + echo " --xz use xz as default decompressor" + echo " --diff use diff to compare files (default)" + echo " --cmp use cmp to compare files" + echo + echo "Report bugs to lzip-bug@nongnu.org" + echo "Lzip home page: http://www.nongnu.org/lzip/lzip.html" + exit 0 ;; + --version | --ve* | -V) + echo "Zdiff VERSION" + echo "Copyright (C) 2009 Antonio Diaz Diaz." + echo "This script is free software: you have unlimited permission" + echo "to copy, distribute and modify it." + exit 0 ;; + --gz*) + default_ext=.gz ;; + --bz*) + default_ext=.bz2 ;; + --lz*) + default_ext=.lz ;; + --xz*) + default_prog=xz ;; + --diff) + diff_prog=diff ;; + --cmp) + diff_prog=cmp ;; + -) + echo "${invocation_name}: reading from stdin not supported" + exit 1 ;; + --) + shift; break ;; + -?*) + args="${args} $1" ;; + *) + break ;; + esac + shift +done + +# Loop over files +while [ x"$1" != x ] ; do + if [ "$1" != "--" ] ; then + 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 \"$1\" not found or not a regular file" 1>&2 + exit 1 + fi + fi + shift +done + +if test -z "${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$/tar/'` ;; + *.xz) + file2=`printf "%s" "${file1}" | sed 's/.xz$//'` ;; + *.txz) + file2=`printf "%s" "${file1}" | sed 's/txz$/tar/'` ;; + *) + file2="${file1}${default_ext}" ;; + esac +fi + +prog1= +prog2= +case "${file1}" in +*.gz | *.tgz) prog1=gzip ;; +*.bz2 | *.tbz | *.tbz2) prog1=bzip2 ;; +*.lz | *.tlz) prog1=lzip ;; +*.xz | *.txz) prog1=xz ;; +esac +case "${file2}" in +*.gz | *.tgz) prog2=gzip ;; +*.bz2 | *.tbz | *.tbz2) prog2=bzip2 ;; +*.lz | *.tlz) prog2=lzip ;; +*.xz | *.txz) prog2=xz ;; +esac + +retval=0 +if test -n "${prog1}"; then + if test -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=$? + fi +else + if test -n "${prog2}"; then + ${prog2} -cdfq -- "${file2}" | ${diff_prog} ${args} -- "${file1}" - + retval=$? + else + ${diff_prog} ${args} -- "${file1}" "${file2}" + retval=$? + fi +fi + +exit ${retval} |