fix and demo cpuonline

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

3 files changed, 25 insertions, 2 deletions

diff --git a/examples/plugins/cpuonline b/examples/plugins/cpuonline
new file mode 100644
index 0000000..1796b22
--- /dev/null
+++ b/examples/plugins/cpuonline
@@ -0,0 +1,21 @@
+# -*- python -*-
+
+# A xpybar configuration example testing the features of plugins.chase
+
+import time
+import threading
+
+from plugins.cpuonline import CPUOnline
+
+
+OUTPUT, HEIGHT, YPOS, TOP = 0, 12, 24, True
+
+
+def redraw():
+    cpu = CPUOnline()
+    s = lambda cpus : ', '.join([str(i) for i in cpus])
+    text = 'Online: %s │ Offline: %s │ Present: %s │ Possible: %s'
+    text %= s(cpu.online), s(cpu.offline), s(cpu.present), s(cpu.possible)
+    bar.clear()
+    bar.draw_coloured_text(0, 10, 0, 2, text)
+
diff --git a/src/plugins/cpuonline.py b/src/plugins/cpuonline.py
index 75e8bed..8b42f66 100644
--- a/src/plugins/cpuonline.py
+++ b/src/plugins/cpuonline.py
@@ -45,8 +45,10 @@ class CPUOnline:
         for filename in ('offline', 'online', 'possible', 'present'):
             with open('/sys/devices/system/cpu/online', 'rb') as file:
                 data.append(file.read())
+        
         data = [x.decode('utf-8', 'replace').replace('\n', ' ').replace(',', ' ') for x in data]
-        data = [reduce(lambda x, y : x + y, map(expand, x.split(' '))) for x in data]
+        data = [map(expand, filter(lambda item : not item == '', x.split(' '))) for x in data]
+        data = [reduce(lambda x, y : x + y, list(x)) for x in data]
         
         (self.offline, self.online, self.possible, self.present) = data
 
diff --git a/src/util.py b/src/util.py
index 9c8c9d5..d42515b 100644
--- a/src/util.py
+++ b/src/util.py
@@ -98,7 +98,7 @@ def reduce(f, items):
     @return  ¿E?               The output
     '''
     if len(items) < 2:
-        return items
+        return [] if len(items) == 0 else items[0]
     rc = items[0]
     for i in range(1, len(items)):
         rc = f(rc, items[i])