add watch

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/util.py b/src/util.py
index 936538d..d12d3b2 100644
--- a/src/util.py
+++ b/src/util.py
@@ -17,6 +17,7 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 '''
 import sys
+import time
 import threading
 import subprocess
 
@@ -35,6 +36,18 @@ def async(target, name = None, group = None):
     return t
 
 
+def watch(interval, target):
+    '''
+    Run a function periodically forever
+    
+    @param  interval:float  The number of seconds to sleep between invocatons
+    @param  target:()→void  The function
+    '''
+    while True:
+        target()
+        time.sleep(interval)
+
+
 def spawn(*command):
     '''
     Spawn an external process