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git/branch: reduce execs to sync working dir

We were execing a lot to copy the data -- do less of it.

--- a/sys/src/cmd/git/branch

+++ b/sys/src/cmd/git/branch

@@ -63,32 +63,42 @@

 echo $commit > .git/$new

 if(! ~ $#stay 0)

 	exit

-

 basedir=`{git/query -p $base}

 dirtypaths=()

 cleanpaths=($modified $deleted)

-if(! ~ $#modified 0 || ! ~ $#deleted 0)

+if(! ~ $#modified 0 || ! ~ $#deleted 0){

+	echo WUT

 	dirtypaths=`$nl{git/walk -cfRMA $modified $deleted}

+}

 if(! ~ $#dirtypaths 0){

 	x=$nl^$cleanpaths

 	y=$nl^$dirtypaths

 	cleanpaths=`$nl{echo $"x$nl$"y | sort | uniq -u}

 }

+if(! ~ $#cleanpaths 0)

+	cleandirs=`$nl{echo $nl^$cleanpaths | sed 's@/[^/]+/?$@@' | uniq}

+if(! ~ $#cleandirs 0){

+	mkdir -p $cleandirs

+	mkdir -p .git/index9/tracked/$cleandirs

+}

+echo clean: $#clean

+echo dirty: $#dirty

 for(m in $cleanpaths){

-	d=`{basename -d $m}

-	mkdir -p $d

-	mkdir -p .git/index9/tracked/$d

 	# Modifications can turn a file into

 	# a directory, or vice versa, so we

 	# need to delete and copy the files

 	# over.

-	a=`{test -f $m && echo file || echo dir}

-	b=`{test -f $basedir/tree/$m && echo file || echo dir}

+	a=dir

+	b=dir

+	if(test -f $m)

+		a=file

+	if(test -f $basedir/tree/$m)

+		b=file

 	if(! ~ $a $b){

 		rm -rf $m

 		rm -rf .git/index9/tracked/$m

 	}

-	if(test -f $basedir/tree/$m){

+	if(~ $b file){

 		cp  $basedir/tree/$m $m

 		walk -eq $m > .git/index9/tracked/$m

 	}

-- 

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