Meta/Linus: blame not just Linus's initial version but any version

diff --git a/Linus b/Linus
index 8cbcd18bb71e6dbbad52f84106128ef066a4ff5f..1b9e162a0193d5c85da88bc2960386387096bf0b 100755 (executable)
--- a/Linus
+++ b/Linus
@@ -4,8 +4,44 @@
 _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"
 
-initial=$(git rev-parse --verify e83c5163316f89bfbde7d9ab23ca2e25604af290) &&
-this=$(git rev-parse --verify ${1-HEAD}^0) || exit
+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
@@ -30,10 +66,12 @@ show () {
        printf "%12d %12d %s (%d.%02d%%)\n" $s $t $n $p $c
 }
 
-git ls-tree -r "$initial" |
-while read mode type sha1 name
+empty_tree=$(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" "$initial" -- "$name" |
+       git blame $opts --porcelain -S "$graft" "$this..$initial" -- "$name" |
        sed -ne "s/^\($_x40\) .*/\1/p" |
        sort |
        uniq -c | {
@@ -57,13 +95,20 @@ do
 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 ))
-               # printf "%12d %12d %s\n" $s $t $n
+               test -n "$summary" ||
                show $s $t $n
        done
-       # printf "%12d %12d %s\n" $surviving $total Total
-       show $surviving $total Total
+       if test -n "$summary"
+       then
+               echo $surviving $total
+       else
+               label=Total
+               show $surviving $total $label
+       fi
+
 }