tools/kvm_stat: print error on invalid regex

Entering an invalid regular expression did not produce any indication of an
error so far.
To reproduce, press 'f' and enter 'foo(' (with an unescaped bracket).

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/tools/kvm/kvm_stat/kvm_stat b/tools/kvm/kvm_stat/kvm_stat
index 4e0f282c52896489fcdb5d25974d07a80ec7531e..08f842238c3207b8ee5aa830e47b7eefe93652d5 100755 (executable)
--- a/tools/kvm/kvm_stat/kvm_stat
+++ b/tools/kvm/kvm_stat/kvm_stat
@@ -1176,6 +1176,7 @@ class Tui(object):
         Asks for a valid regex and sets the fields filter accordingly.
 
         """
+        msg = ''
         while True:
             self.screen.erase()
             self.screen.addstr(0, 0,
@@ -1184,6 +1185,7 @@ class Tui(object):
             self.screen.addstr(2, 0,
                                "Current regex: {0}"
                                .format(self.stats.fields_filter))
+            self.screen.addstr(5, 0, msg)
             self.screen.addstr(3, 0, "New regex: ")
             curses.echo()
             regex = self.screen.getstr().decode(ENCODING)
@@ -1198,6 +1200,7 @@ class Tui(object):
                 self.refresh_header()
                 return
             except re.error:
+                msg = '"' + regex + '": Not a valid regular expression'
                 continue
 
     def show_vm_selection_by_pid(self):