scripts/kvm/kvm_stat: Add interactive filtering

Interactively changing the filter is much more useful than the
drilldown, because it is more versatile.

With this patch, the filter can be changed by pressing 'f' in the text
ui and entering a new filter regex.

Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Message-Id: <1452525484-32309-34-git-send-email-frankja@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/scripts/kvm/kvm_stat b/scripts/kvm/kvm_stat
index eb97a650f0d40ee7153ca5456c2de4b16dfd82a2..25631a49f7d1934bf97744a7771239e65a18572d 100755 (executable)
--- a/scripts/kvm/kvm_stat
+++ b/scripts/kvm/kvm_stat
@@ -634,6 +634,28 @@ class Tui(object):
             row += 1
         self.screen.refresh()
 
+    def show_filter_selection(self):
+        while True:
+            self.screen.erase()
+            self.screen.addstr(0, 0,
+                               "Show statistics for events matching a regex.",
+                               curses.A_BOLD)
+            self.screen.addstr(2, 0,
+                               "Current regex: {0}"
+                               .format(self.stats.fields_filter))
+            self.screen.addstr(3, 0, "New regex: ")
+            curses.echo()
+            regex = self.screen.getstr()
+            curses.noecho()
+            if len(regex) == 0:
+                return
+            try:
+                re.compile(regex)
+                self.stats.fields_filter = regex
+                return
+            except re.error:
+                continue
+
     def show_stats(self):
         sleeptime = 0.25
         while True:
@@ -647,6 +669,8 @@ class Tui(object):
                     self.update_drilldown()
                 if char == 'q':
                     break
+                if char == 'f':
+                    self.show_filter_selection()
             except KeyboardInterrupt:
                 break
             except curses.error: