lib: add cli preprocessor for `|` actions

This patch adds a CLI preprocessor function that activates when `|` is
found in the command. This is the start of adding support for some text
processing utilities intended for inline use. The first one implemented
here is `| include`, which provides grep-like filtering of command
output.

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/vty.h b/lib/vty.h
index 6e5ff13ff..32fd471f1 100644
--- a/lib/vty.h
+++ b/lib/vty.h
@@ -21,6 +21,9 @@
 #ifndef _ZEBRA_VTY_H
 #define _ZEBRA_VTY_H
 
+#include <sys/types.h>
+#include <regex.h>
+
 #include "thread.h"
 #include "log.h"
 #include "sockunion.h"
@@ -47,6 +50,10 @@ struct vty {
 	/* Failure count */
 	int fail;
 
+	/* Output filer regex */
+	bool filter;
+	regex_t include;
+
 	/* Output buffer. */
 	struct buffer *obuf;
 
@@ -223,6 +230,7 @@ extern struct vty *vty_stdio(void (*atclose)(int isexit));
 extern int vty_out(struct vty *, const char *, ...) PRINTF_ATTRIBUTE(2, 3);
 extern void vty_frame(struct vty *, const char *, ...) PRINTF_ATTRIBUTE(2, 3);
 extern void vty_endframe(struct vty *, const char *);
+bool vty_set_include(struct vty *vty, const char *regexp);
 
 extern void vty_read_config(const char *, char *);
 extern void vty_time_print(struct vty *, int);