#!/usr/bin/python2.3
import urllib, socket, re, os, time, sys
"""Script to ping various blog trackers when my Blosxom blog changes.
Suitable for running as a cron job.

Does a find across a directory for .txt files. If any of them are newer
than the last time we pinged a weblog spot, then we ping it again.

By Nelson Minar <nelson@monkey.org>
http://www.nelson.monkey.org/~nelson/
2003-08-24. I place this work in the public domain.
"""

sys.stderr.write("This script won't run without modification.\n")
sys.exit(0)
# Sorry, but it's not bulletproof yet - if you know enough to edit
# this script, then maybe it's safe for you to run it.

# Directory of your Blosxom install
blosxomDir="/home/nelson/blosxom"

# Places to ping - you can generate these at the sites
urls = [
 ('blo.gs', 'FILL THIS IN'),
 ('weblogs.com', 'FILL THIS IN')
]

# Socket timeouts - sometimes these hosts are slow
socketTimeout = 25

# Enable verbose output
verbose = True


### End of configuration directives
entryRE = re.compile(r'^[^.].*txt$')
stateFilePrefix = ".lastPing"


# Set timeouts
socket.setdefaulttimeout(socketTimeout)

# Change to the Blosxom directory
os.chdir(blosxomDir)


# Find the newest Blosxom entry
newestEntry = None
def findNewest(arg, dirname, names):
    "Callback for os.path.walk() that finds the newest file"
    global newestEntry
    for n in names:
        if not entryRE.search(n):
            continue
        fn = os.path.normpath(os.path.join(dirname, n))
        mtime = os.path.getmtime(fn)
        if not newestEntry or mtime > newestEntry[1]:
            newestEntry = (fn, mtime)
os.path.walk("entries", findNewest, None)

if verbose: sys.stderr.write("Newest entry: %s %s\n" % \
                             (newestEntry[0], time.ctime(newestEntry[1])))

# Loop through each URL, testing and pinging
for url in urls:
    if verbose: sys.stderr.write("\nProcessing %s\n" % url[0])
    stateFile = "%s-%s" % (stateFilePrefix, url[0])

    # Read the last ping time (make the file if necessary)
    if os.path.exists(stateFile):
        lastPingTime = os.path.getmtime(stateFile)
    else:
        open(stateFile, "w").close()
        os.utime(stateFile, (0, 0))
        lastPingTime = 0
    if verbose: sys.stderr.write("Last ping: %s\n" % time.ctime(lastPingTime))

    # Test: do we need to ping?
    if newestEntry[1] < lastPingTime:
        if verbose: sys.stderr.write("No new entries, skipping\n")
        continue

    # Do the actual ping and touch the file
    success = True
    if verbose: sys.stderr.write("Pinging %s\n" % url[1])
    try:
        fp = urllib.urlopen(url[1])
        output = fp.read()
        fp.close()
        os.utime(stateFile, None)
        # if verbose: sys.stderr.write("Output: %s\n" % output)
    except Error, e:
        if verbose: sys.stderr.write("Ping error: %s\n" % e)