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g: filter directory arguments

When searching directories recursively, it's still
desirable to filter the contents by the file pattern,
so that 'g foo /sys/src' doesn't end up searching for
foo within .$O files.

Files passed explicitly are still searched, so for the
old behavior, just use walk:

	g foo `{walk -f $dir}

--- a/rc/bin/g

+++ b/rc/bin/g

@@ -14,6 +14,8 @@

 if(~ $1 --)

 	shift

+suffixes='\.([bcChlmsy]|asm|awk|cc|cgi|cpp|cs|go|goc|hs|java|lx|ms|pl|py|rc|tex|xy)$'

+fullnames='(^|/)mkfile$'

 switch($#*){

 case 0

 	echo 'usage: g [flags] pattern [files]' >[1=2]

@@ -20,12 +22,16 @@

 	exit usage

 case 1

 	pattern=$1

-	fullnames='mkfile$'

-	suffixes='\.([bcChlmsy]|asm|awk|cc|cgi|cpp|cs|go|goc|hs|java|lx|ms|pl|py|rc|tex|xy)$'

 	files=`$nl{walk -f $recurse | grep -e $fullnames -e $suffixes >[2]/dev/null}

 case *

 	pattern=$1

 	shift

-	files=`$nl{walk -f $recurse -- $*}

+	for(f in $*){

+		if(test -d $f)

+			files=($files `$nl{walk -f $recurse -- $* \

+				| grep -e $fullnames -e $suffixes >[2]/dev/null})

+		if not

+			files=$(files $f)

+	}

 }

 grep -n $flags -- $pattern $files /dev/null

-- 

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