openfiles: module to report open file handle count

This module will display the current open file handles and the kernel
setting for max open file handles.  This is particularly useful when
running applications that like to grab a lot of file handles to help
monitor if/when your system may run out of available file handles.

i3pystatus/openfiles.py

@@ -0,0 +1,30 @@
+from i3pystatus import IntervalModule
+
+
+class Openfiles(IntervalModule):
+    """
+    Displays the current/max open files.
+    """
+
+    settings = (
+        ("filenr_path", "Location to file-nr (usually /proc/sys/fs/file-nr"),
+        "color",
+        "format"
+    )
+    color = 'FFFFFF'
+    interval = 30
+    filenr_path = '/proc/sys/fs/file-nr'
+    format = "open/max: {openfiles}/{maxfiles}"
+
+    def run(self):
+
+        cur_filenr = open(self.filenr_path, 'r').readlines()
+        openfiles, unused, maxfiles = cur_filenr[0].split()
+
+        cdict = {'openfiles': openfiles,
+                 'maxfiles': maxfiles}
+
+        self.output = {
+            "full_text": self.format.format(**cdict),
+            "color": self.color
+        }