various tweaks.

include/complete.h

@@ -0,0 +1,15 @@
+#pragma	lib	"libcomplete.a"
+#pragma src "/sys/src/libcomplete"
+
+typedef struct Completion Completion;
+
+struct Completion{
+	uchar advance;		/* whether forward progress has been made */
+	uchar complete;	/* whether the completion now represents a file or directory */
+	char *string;		/* the string to advance, suffixed " " or "/" for file or directory */
+	int nfile;			/* number of files that matched */
+	char **filename;	/* their names */
+};
+
+Completion* complete(char *dir, char *s);
+void freecompletion(Completion*);