#!/usr/bin/python

import curses
import sys, os, time, optparse

def read_interrupts():
    irq = {}
    proc = file('/proc/interrupts')
    nrcpu = len(proc.readline().split())
    for line in proc.readlines():
        vec, data = line.strip().split(':', 1)
        if vec in ('ERR', 'MIS'):
            continue
        counts = data.split(None, nrcpu)
        counts, rest = (counts[:-1], counts[-1])
        count = sum([int(x) for x in counts])
        try:
            v = int(vec)
            name = rest.split(None, 1)[1]
        except:
            name = rest
        irq[name] = count
    return irq

def delta_interrupts():
    old = read_interrupts()
    while True:
        irq = read_interrupts()
        delta = {}
        for key in irq.keys():
            delta[key] = irq[key] - old[key]
        yield delta
        old = irq

label_width = 30
number_width = 10

def tui(screen):
    curses.use_default_colors()
    curses.noecho()
    def getcount(x):
        return x[1]
    def refresh(irq):
        screen.erase()
        screen.addstr(0, 0, 'irqtop')
        row = 2
        for name, count in sorted(irq.items(), key = getcount, reverse = True):
            if row >= screen.getmaxyx()[0]:
                break
            col = 1
            screen.addstr(row, col, name)
            col += label_width
            screen.addstr(row, col, '%10d' % (count,))
            row += 1
        screen.refresh()

    for irqs in delta_interrupts():
        refresh(irqs)
        curses.halfdelay(10)
        try:
            c = screen.getkey()
            if c == 'q':
                break
        except KeyboardInterrupt:
            break
        except curses.error:
            continue

import curses.wrapper
curses.wrapper(tui)