[Qemu-devel] [PATCH 34/34] scripts/kvm/kvm_stat: Add interactive filtering

[Janosch Frank]

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.
---
 scripts/kvm/kvm_stat | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/scripts/kvm/kvm_stat b/scripts/kvm/kvm_stat
index 556e5ca..cd5c4d9 100755
--- a/scripts/kvm/kvm_stat
+++ b/scripts/kvm/kvm_stat
@@ -592,6 +592,28 @@ 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:
@@ -605,6 +627,10 @@ class Tui(object):
                     self.update_drilldown()
                 if char == 'q':
                     break
+                if char == 'p':
+                    self.show_vm_selection()
+                if char == 'f':
+                    self.show_filter_selection()
             except KeyboardInterrupt:
                 break
             except curses.error:
-- 
2.3.0