59 lines
1.2 KiB
Bash
Executable file
59 lines
1.2 KiB
Bash
Executable file
#! /bin/sh -e
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#DIFF=zdc
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DIFF=bsdiff
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srcA=$1
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srcB=$2
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if test -z "$srcA" -o -z "$srcB"; then
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echo "syntax: bdiff.sh srcA srcB"
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exit 1
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fi
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(cd $srcB && find . -type f) | while read fn; do
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if test -f "$srcA/$fn"; then
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if ! test -f "$srcB/$fn"; then
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echo "DELETE $fn"
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else
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if ! cmp "$srcA/$fn" "$srcB/$fn" > /dev/null; then
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echo "FILE DELTA FOR $fn"
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TMPFILE=/tmp/__bsdiff
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$DIFF "$srcA/$fn" "$srcB/$fn" $TMPFILE
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cat $TMPFILE
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diffSize=$(stat -c '%s' $TMPFILE)
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# For comparison.
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bzipSize=$(bzip2 < "$srcB/$fn" | wc -m)
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gain=$(echo "scale=2; ($diffSize - $bzipSize) / $bzipSize * 100" | bc)
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ouch=$(if test "${gain:0:1}" != "-"; then echo "!"; fi)
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printf "%7.2f %1s %10d %10d %s\n" \
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"$gain" "$ouch" "$diffSize" "$bzipSize" "$fn" >&2
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# echo "$fn -> $diffSize $bzipSize ==> $gain $ouch" >&2
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rm $TMPFILE
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fi
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fi
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# Note: be silent about unchanged files.
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else
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echo "NEW FILE $fn"
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cat "$srcB/$fn"
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fi
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done
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