From 83e425b995e43fb21585d23d5059b9bd734b7744 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Sat, 17 Oct 2015 17:47:48 +0300
Subject: Don't update widgets if they're uninterested

---
 ttystatus/fmt.py    | 12 +++++++++---
 ttystatus/status.py |  8 ++++++--
 2 files changed, 15 insertions(+), 5 deletions(-)

(limited to 'ttystatus')

diff --git a/ttystatus/fmt.py b/ttystatus/fmt.py
index 5ad7994..ec5b18f 100644
--- a/ttystatus/fmt.py
+++ b/ttystatus/fmt.py
@@ -46,12 +46,16 @@ def parse(fmt):
         m = pat.match(fmt)
         if m:
             if prefix:
-                result.append(ttystatus.Literal(prefix))
+                literal = ttystatus.Literal(prefix)
+                literal.interested_in = []
+                result.append(literal)
                 prefix = ''
             klass = getattr(ttystatus, m.group('class'))
             argnames = m.group('args').split(',')
             argnames = [x for x in argnames if x]
-            result.append(klass(*argnames))
+            widget = klass(*argnames)
+            widget.interested_in = argnames
+            result.append(widget)
             fmt = fmt[m.end():]
         elif fmt.startswith('%%'):
             prefix += '%'
@@ -61,5 +65,7 @@ def parse(fmt):
             fmt = fmt[1:]
 
     if prefix:
-        result.append(ttystatus.Literal(prefix))
+        literal = ttystatus.Literal(prefix)
+        literal.interested_in = []
+        result.append(literal)
     return result
diff --git a/ttystatus/status.py b/ttystatus/status.py
index df45ebc..fe90b96 100644
--- a/ttystatus/status.py
+++ b/ttystatus/status.py
@@ -46,6 +46,8 @@ class TerminalStatus(object):
         if not self._widget_rows:
             self._widget_rows = [[]]
         self._widget_rows[-1].append(widget)
+        if not hasattr(widget, 'interested_in'):
+            widget.interested_in = None
 
     def start_new_line(self):  # pragma: no cover
         '''Start a new line of widgets.'''
@@ -79,7 +81,8 @@ class TerminalStatus(object):
     def clear(self):
         '''Remove all widgets.'''
         self._widget_rows = []
-        self._values = dict()
+        self._values = {}
+        self._interested_in = {}
         self._m.clear()
 
     def __getitem__(self, key):
@@ -95,7 +98,8 @@ class TerminalStatus(object):
         self._values[key] = value
         for row in self._widget_rows:
             for w in row:
-                w.update(self)
+                if w.interested_in is None or key in w.interested_in:
+                    w.update(self)
         if self._m.is_enabled() and self._m.time_to_write():
             self._write()
 
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