From 120f967196c4ce76fb9836162ac6e237a4327166 Mon Sep 17 00:00:00 2001
From: Peter Wu <peter@lekensteyn.nl>
Date: Wed, 18 Jun 2014 12:06:18 +0200
Subject: interrupts-graph.py: prepare for writing / reading to file

---
 rare/interrupts-graph.py | 48 ++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 38 insertions(+), 10 deletions(-)

diff --git a/rare/interrupts-graph.py b/rare/interrupts-graph.py
index e4286c3..eb4c5c4 100755
--- a/rare/interrupts-graph.py
+++ b/rare/interrupts-graph.py
@@ -38,6 +38,7 @@ ALT_COLORS = ['#023FA5', '#7D87B9', '#BEC1D4', '#D6BCC0', '#BB7784', '#FFFFFF',
 '#8DD593', '#C6DEC7', '#EAD3C6', '#F0B98D', '#EF9708', '#0FCFC0', '#9CDED6',
 '#D5EAE7', '#F3E1EB', '#F6C4E1', '#F79CD4']
 
+input_filename, output_filename = '', ''
 
 def is_line_ok(name, yvalues):
     """Returns True if a line should be displayed for this name."""
@@ -65,18 +66,45 @@ def synchronized(lock):
         return newFunction
     return wrap
 
+if not input_filename:
+    input_filename = '/proc/interrupts'
+input_is_proc = input_filename == '/proc/interrupts'
+input_file = open(input_filename)
+output_file = open(output_filename, 'a') if output_filename else None
+output_writer = output_file.write if output_file else None
+
 def get_numbers():
     # TODO: may break the graph if a line disappears
-    with open('/proc/interrupts') as pi:
-        ncpus = len(pi.readline().split())
-        for line in pi:
-            name, values = line.split(':', 1)
-            name = name.strip()
-            values = values.strip().split(None, ncpus)
-            if len(values) >= ncpus:
-                # Name is ID + description for uniqueness
-                name += ':' + values[-1];
-                yield name, sum(int(values[i]) for i in range(0, ncpus))
+    if input_is_proc:
+        # Rewind stream
+        input_file.seek(0)
+        return parse_raw(input_file, output_writer)
+    else:
+        return parse_raw(input_file, output_writer)
+
+def parse_raw(pi, line_callback=None):
+    ncpus = None
+    for line in pi:
+        # Treat empty lines as boundary
+        if not line.strip():
+            break
+        if line_callback:
+            line_callback(line)
+
+        if ncpus is None:
+            ncpus = len(line.split())
+            continue
+        name, values = line.split(':', 1)
+        name = name.strip()
+        values = values.strip().split(None, ncpus)
+        if len(values) >= ncpus:
+            # Name is ID + description for uniqueness
+            name += ':' + values[-1];
+            yield name, sum(int(values[i]) for i in range(0, ncpus))
+
+    # Signal end of entry
+    if line_callback:
+        line_callback('\n')
 
 prev = OrderedDict()
 def get_diffs():
-- 
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