167 lines
3.8 KiB
Bash
Executable File
167 lines
3.8 KiB
Bash
Executable File
#!/bin/sh
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#
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# xzize.sh, Copyright © 2010, 2019 Matteo Cypriani
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#
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# This program is free software. It comes without any warranty, to
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# the extent permitted by applicable law. You can redistribute it
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# and/or modify it under the terms of the Do What The Fuck You Want
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# To Public License, Version 2, as published by Sam Hocevar. See
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# http://sam.zoy.org/wtfpl/COPYING for more details.
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#
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# This script recompresses to XZ one or several GZip (.gz, .tgz), BZip2 (.bz2,
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# .tbz, .tb2), LZMA (.lzma, .tlz), or Lempel-Ziv (.Z, .taz) compressed file(s).
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# The original files are kept.
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#
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# If a file extension does not correspond to a known compression format, that
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# file is compressed to XZ. In that case, the original file is removed.
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#
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# If the file is already XZ-compressed (.xz, .txz), nothing is done.
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#set -x
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set -u
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# Destination file suffix when source file name suffix is a
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# 3-letter compressed tar suffix:
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readonly TAR_XZ_EXT=txz
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# Default compression level:
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COMPRESSION_LEVEL=
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test_extension()
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{
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FILE="$1"
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EXTENSION="$2"
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NEWEXTENSION=xz
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if [ $# -eq 3 ] ; then
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NEWEXTENSION="$3"
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fi
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BASE="$(basename "$FILE" ."$EXTENSION")"
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if [ "$BASE" != "$FILE" ] ; then
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DEST="$BASE".$NEWEXTENSION
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return 0
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fi
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DEST="$FILE"
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return 1
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}
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do_recompress()
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{
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if [ -e "$DEST" ] ; then
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echo "Skipping source file « $SOURCE »: destination file « $DEST » already exists!" >&2
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return 0
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fi
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echo "Recompressing « $SOURCE » to « $DEST »…"
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$ACTION -c "$SOURCE" | xz $COMPRESSION_LEVEL >"$DEST"
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return $?
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}
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## Verify number of arguments ##
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if [ $# -lt 1 ] ; then
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echo "$0 requires at least one argument!" >&2
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exit 2
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fi
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## Process files ##
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for SOURCE in "$@" ; do
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# Does source file exist?
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if [ ! -e "$SOURCE" ] ; then
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echo "Skipping source file « $SOURCE »: does not exist!" >&2
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continue
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fi
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# Is source file regular?
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if [ ! -f "$SOURCE" ] ; then
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echo "Skipping source file « $SOURCE »: is not a regular file!" >&2
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continue
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fi
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# GZip
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if test_extension "$SOURCE" gz ; then
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ACTION="gunzip"
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do_recompress
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continue
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fi
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# GZipped Tar (.tgz)
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if test_extension "$SOURCE" tgz $TAR_XZ_EXT ; then
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ACTION="gunzip"
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do_recompress
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continue
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fi
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# BZip2
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if test_extension "$SOURCE" bz2 ; then
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ACTION="bunzip2"
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do_recompress
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continue
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fi
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# BZipped Tar (.tbz)
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if test_extension "$SOURCE" tbz $TAR_XZ_EXT ; then
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ACTION="bunzip2"
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do_recompress
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continue
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fi
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# BZipped Tar (.tb2)
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if test_extension "$SOURCE" tb2 $TAR_XZ_EXT ; then
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ACTION="bunzip2"
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do_recompress
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continue
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fi
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# LZMA
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if test_extension "$SOURCE" lzma ; then
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ACTION="unlzma"
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do_recompress
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continue
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fi
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# LZMA compressed Tar (.tlz)
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if test_extension "$SOURCE" tlz $TAR_XZ_EXT ; then
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ACTION="unlzma"
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do_recompress
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continue
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fi
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# Compress
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if test_extension "$SOURCE" Z ; then
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ACTION="uncompress"
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do_recompress
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continue
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fi
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# Compressed Tar (.taz)
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if test_extension "$SOURCE" taz $TAR_XZ_EXT ; then
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ACTION="uncompress"
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do_recompress
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continue
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fi
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# XZ
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if test_extension "$SOURCE" xz ; then
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echo "Skipping source file « $DEST »: has already .xz suffix!" >&2
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continue
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fi
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# XZipped Tar (.txz)
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if test_extension "$SOURCE" txz $TAR_XZ_EXT ; then
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echo "Skipping source file « $DEST »: seems to be a XZipped Tar archive (.txz suffix)!" >&2
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continue
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fi
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# Uncompressed file: fall back to simple compression
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echo "Compressing « $SOURCE » to xz…"
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xz $COMPRESSION_LEVEL "$SOURCE"
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done
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# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
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