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c: add enum (-e) search option

--- a/bin/c

+++ b/bin/c

@@ -21,6 +21,23 @@

 	}' | sam -d $files >[2]/dev/null

 }

+fn enum {

+	search = $*

+	if(~ $#search 0)

+		search = (.)

+	files = `{walk -f $search | grep '\.[ch]$'}

+	awk '

+	/^enum[ 	]*{/ {

+		matched = 1

+		if(nfound++ > 0) printf "\n"

+		if(ARGC != 1)

+			print FILENAME ":" FNR

+	}

+	matched         {print}

+	matched && /^}/ {matched = 0}

+	' $files

+}

+

 fn function {

 	ignore = ('\.root.s$' 'cmd/python/')

 	search = $*

@@ -46,6 +63,7 @@

 flagfmt = 'e,f,s'; args = '[regexp] [searchpath]'

 eval `{aux/getflags $*} || exec aux/usage

+if(~ $flage 1) op = 'enum'

 if(~ $flagf 1) op = 'function'

 if(~ $flags 1) op = 'struct'

 if(! isatty){