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#!/bin/sh
# How much of the very original version from Linus survive?
_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
summary=
while case $# in 0) break ;; esac
do
case "$1" in
-s | --summary)
summary=t
;;
-*)
echo >&2 "$1: unknown option"
exit 1
;;
*)
break
;;
esac
shift
done
if test $# = 0
then
this=HEAD
else
this=$1
shift
fi
if test $# = 0
then
initial=e83c5163316f89bfbde7d9ab23ca2e25604af290
range="..$this"
else
initial=$1
range="$initial..$this"
shift
fi
this=$(git rev-parse --verify "$this^0") &&
initial=$(git rev-parse --verify "$initial^0") || exit
tmp="/var/tmp/Linus.$$"
trap 'rm -f "$tmp".*' 0
# We blame each file in the initial revision pretending as if it is a
# direct descendant of the given version, and also pretend that the
# latter is a root commit. This way, lines in the initial revision
# that survived to the other version can be identified (they will be
# attributed to the other version).
graft="$tmp.graft" &&
{
echo "$initial $this"
echo "$this"
} >"$graft" || exit
opts='-C -C -C -w'
show () {
s=$1 t=$2 n=$3
p=$(($s * 100 / $t))
c=$(($s * 10000 / $t - $p * 100))
printf "%12d %12d %s (%d.%02d%%)\n" $s $t $n $p $c
}
empty_tree=$(git hash-object -t tree -w --stdin </dev/null)
git diff-tree -r --raw $empty_tree $initial -- "$@" |
while read mode_old mode_new sha1_old sha1_new op name
do
git blame $opts --porcelain -S "$graft" "$this..$initial" -- "$name" |
sed -ne "s/^\($_x40\) .*/\1/p" |
sort |
uniq -c | {
# There are only two commits in the fake history, so
# there will be at most two output from the above.
read cnt1 commit1
read cnt2 commit2
if test -z "$commit2"
then
cnt2=0
fi
if test "$initial" != "$commit1"
then
cnt_surviving=$cnt1
else
cnt_surviving=$cnt2
fi
cnt_total=$(( $cnt1 + $cnt2 ))
echo "$cnt_surviving $cnt_total $name"
}
done | {
total=0
surviving=0
test -n "$summary" ||
printf "%12s %12s %s (survival%%)\n" surviving original path
while read s t n
do
total=$(( $total + $t )) surviving=$(( $surviving + $s ))
test -n "$summary" ||
show $s $t $n
done
if test -n "$summary"
then
echo $surviving $total
else
label=Total
show $surviving $total $label
fi
}
|
