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git/diff: make '-u' flag imply '-s'

Without '-s', '-u' makes no sense: it acts like
a weird version of cat that prepends each line
with '+'.

--- a/sys/src/cmd/git/diff

+++ b/sys/src/cmd/git/diff

@@ -20,7 +20,7 @@

 	files=`{cleanname -d $gitrel $*}

 branch=`{git/query -p $commit}

-if(~ $summarize 1){

+if(~ $summarize 1 || ~ $uncommitted 1){

 	git/walk -f$filt $cparam $files

 	exit

 }

--- a/sys/src/cmd/git/walk.c

+++ b/sys/src/cmd/git/walk.c

@@ -299,6 +299,8 @@

 {

 	int i;

+	if(p == nil)

+		return 0;

 	if(npfx == 0)

 		return 1;

 	for(i = 0; i < npfx; i++){

-- 

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