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#! /usr/bin/env python
#######################################################################
# Newslist $Revision$
#
# Syntax:
# newslist [ -a ]
#
# This is a program to create a directory full of HTML pages
# which between them contain links to all the newsgroups available
# on your server.
#
# The -a option causes a complete list of all groups to be read from
# the server rather than just the ones which have appeared since last
# execution. This recreates the local list from scratch. Use this on
# the first invocation of the program, and from time to time thereafter.
# When new groups are first created they may appear on your server as
# empty groups. By default, empty groups are ignored by the -a option.
# However, these new groups will not be created again, and so will not
# appear in the server's list of 'new groups' at a later date. Hence it
# won't appear until you do a '-a' after some articles have appeared.
#
# I should really keep a list of ignored empty groups and re-check them
# for articles on every run, but I haven't got around to it yet.
#
# This assumes an NNTP news feed.
#
# Feel free to copy, distribute and modify this code for
# non-commercial use. If you make any useful modifications, let me
# know!
#
# (c) Quentin Stafford-Fraser 1994
# fraser@europarc.xerox.com qs101@cl.cam.ac.uk
# #
#######################################################################
import sys, nntplib, marshal, time, os
#######################################################################
# Check these variables before running! #
# Top directory.
# Filenames which don't start with / are taken as being relative to this.
topdir = os.path.expanduser('~/newspage')
# The name of your NNTP host
# eg.
# newshost = 'nntp-serv.cl.cam.ac.uk'
# or use following to get the name from the NNTPSERVER environment
# variable:
# newshost = os.environ['NNTPSERVER']
newshost = 'news.example.com'
# The filename for a local cache of the newsgroup list
treefile = 'grouptree'
# The filename for descriptions of newsgroups
# I found a suitable one at ftp.uu.net in /uunet-info/newgroups.gz
# You can set this to '' if you don't wish to use one.
descfile = 'newsgroups'
# The directory in which HTML pages should be created
# eg.
# pagedir = '/usr/local/lib/html/newspage'
# pagedir = 'pages'
pagedir = topdir
# The html prefix which will refer to this directory
# eg.
# httppref = '/newspage/',
# or leave blank for relative links between pages: (Recommended)
# httppref = ''
httppref = ''
# The name of the 'root' news page in this directory.
# A .html suffix will be added.
rootpage = 'root'
# Set skipempty to 0 if you wish to see links to empty groups as well.
# Only affects the -a option.
skipempty = 1
# pagelinkicon can contain html to put an icon after links to
# further pages. This helps to make important links stand out.
# Set to '' if not wanted, or '...' is quite a good one.
pagelinkicon = '... <img src="http://pelican.cl.cam.ac.uk/icons/page.xbm"> '
# ---------------------------------------------------------------------
# Less important personal preferences:
# Sublistsize controls the maximum number of items the will appear as
# an indented sub-list before the whole thing is moved onto a different
# page. The smaller this is, the more pages you will have, but the
# shorter each will be.
sublistsize = 4
# That should be all. #
#######################################################################
for dir in os.curdir, os.environ['HOME']:
rcfile = os.path.join(dir, '.newslistrc.py')
if os.path.exists(rcfile):
print rcfile
execfile(rcfile)
break
from nntplib import NNTP
from stat import *
rcsrev = '$Revision$'
rcsrev = ' '.join(filter(lambda s: '$' not in s, rcsrev.split()))
desc = {}
# Make (possibly) relative filenames into absolute ones
treefile = os.path.join(topdir,treefile)
descfile = os.path.join(topdir,descfile)
page = os.path.join(topdir,pagedir)
# First the bits for creating trees ---------------------------
# Addtotree creates/augments a tree from a list of group names
def addtotree(tree, groups):
print 'Updating tree...'
for i in groups:
parts = i.split('.')
makeleaf(tree, parts)
# Makeleaf makes a leaf and the branch leading to it if necessary
def makeleaf(tree,path):
j = path[0]
l = len(path)
if j not in tree:
tree[j] = {}
if l == 1:
tree[j]['.'] = '.'
if l > 1:
makeleaf(tree[j],path[1:])
# Then the bits for outputting trees as pages ----------------
# Createpage creates an HTML file named <root>.html containing links
# to those groups beginning with <root>.
def createpage(root, tree, p):
filename = os.path.join(pagedir, root+'.html')
if root == rootpage:
detail = ''
else:
detail = ' under ' + root
with open(filename, 'w') as f:
# f.write('Content-Type: text/html\n')
f.write('<html>\n<head>\n')
f.write('<title>Newsgroups available%s</title>\n' % detail)
f.write('</head>\n<body>\n')
f.write('<h1>Newsgroups available%s</h1>\n' % detail)
f.write('<a href="%s%s.html">Back to top level</a><p>\n' %
(httppref, rootpage))
printtree(f, tree, 0, p)
f.write('\n<p>')
f.write("<i>This page automatically created by 'newslist' v. %s." %
rcsrev)
f.write(time.ctime(time.time()) + '</i>\n')
f.write('</body>\n</html>\n')
# Printtree prints the groups as a bulleted list. Groups with
# more than <sublistsize> subgroups will be put on a separate page.
# Other sets of subgroups are just indented.
def printtree(f, tree, indent, p):
l = len(tree)
if l > sublistsize and indent > 0:
# Create a new page and a link to it
f.write('<li><b><a href="%s%s.html">' % (httppref, p[1:]))
f.write(p[1:] + '.*')
f.write('</a></b>%s\n' % pagelinkicon)
createpage(p[1:], tree, p)
return
kl = tree.keys()
if l > 1:
kl.sort()
if indent > 0:
# Create a sub-list
f.write('<li>%s\n<ul>' % p[1:])
else:
# Create a main list
f.write('<ul>')
indent = indent + 1
for i in kl:
if i == '.':
# Output a newsgroup
f.write('<li><a href="news:%s">%s</a> ' % (p[1:], p[1:]))
if p[1:] in desc:
f.write(' <i>%s</i>\n' % desc[p[1:]])
else:
f.write('\n')
else:
# Output a hierarchy
printtree(f, tree[i], indent, p+'.'+i)
if l > 1:
f.write('\n</ul>')
# Reading descriptions file ---------------------------------------
# This returns a dict mapping group name to its description
def readdesc(descfile):
global desc
desc = {}
if descfile == '':
return
try:
with open(descfile, 'r') as d:
print 'Reading descriptions...'
for l in d:
bits = l.split()
try:
grp = bits[0]
dsc = ' '.join(bits[1:])
if len(dsc) > 1:
desc[grp] = dsc
except IndexError:
pass
except IOError:
print 'Failed to open description file ' + descfile
return
# Check that ouput directory exists, ------------------------------
# and offer to create it if not
def checkopdir(pagedir):
if not os.path.isdir(pagedir):
print 'Directory %s does not exist.' % pagedir
print 'Shall I create it for you? (y/n)'
if sys.stdin.readline()[0] == 'y':
try:
os.mkdir(pagedir, 0777)
except:
print 'Sorry - failed!'
sys.exit(1)
else:
print 'OK. Exiting.'
sys.exit(1)
# Read and write current local tree ----------------------------------
def readlocallist(treefile):
print 'Reading current local group list...'
tree = {}
try:
treetime = time.localtime(os.stat(treefile)[ST_MTIME])
except:
print '\n*** Failed to open local group cache '+treefile
print 'If this is the first time you have run newslist, then'
print 'use the -a option to create it.'
sys.exit(1)
treedate = '%02d%02d%02d' % (treetime[0] % 100, treetime[1], treetime[2])
try:
with open(treefile, 'rb') as dump:
tree = marshal.load(dump)
except IOError:
print 'Cannot open local group list ' + treefile
return (tree, treedate)
def writelocallist(treefile, tree):
try:
with open(treefile, 'wb') as dump:
groups = marshal.dump(tree, dump)
print 'Saved list to %s\n' % treefile
except:
print 'Sorry - failed to write to local group cache', treefile
print 'Does it (or its directory) have the correct permissions?'
sys.exit(1)
# Return list of all groups on server -----------------------------
def getallgroups(server):
print 'Getting list of all groups...'
treedate = '010101'
info = server.list()[1]
groups = []
print 'Processing...'
if skipempty:
print '\nIgnoring following empty groups:'
for i in info:
grpname = i[0].split()[0]
if skipempty and int(i[1]) < int(i[2]):
print grpname + ' ',
else:
groups.append(grpname)
print '\n'
if skipempty:
print '(End of empty groups)'
return groups
# Return list of new groups on server -----------------------------
def getnewgroups(server, treedate):
print 'Getting list of new groups since start of %s...' % treedate,
info = server.newgroups(treedate, '000001')[1]
print 'got %d.' % len(info)
print 'Processing...',
groups = []
for i in info:
grpname = i.split()[0]
groups.append(grpname)
print 'Done'
return groups
# Now the main program --------------------------------------------
def main():
tree = {}
# Check that the output directory exists
checkopdir(pagedir)
try:
print 'Connecting to %s...' % newshost
if sys.version[0] == '0':
s = NNTP.init(newshost)
else:
s = NNTP(newshost)
connected = True
except (nntplib.error_temp, nntplib.error_perm), x:
print 'Error connecting to host:', x
print 'I\'ll try to use just the local list.'
connected = False
# If -a is specified, read the full list of groups from server
if connected and len(sys.argv) > 1 and sys.argv[1] == '-a':
groups = getallgroups(s)
# Otherwise just read the local file and then add
# groups created since local file last modified.
else:
(tree, treedate) = readlocallist(treefile)
if connected:
groups = getnewgroups(s, treedate)
if connected:
addtotree(tree, groups)
writelocallist(treefile,tree)
# Read group descriptions
readdesc(descfile)
print 'Creating pages...'
createpage(rootpage, tree, '')
print 'Done'
if __name__ == "__main__":
main()
# That's all folks
######################################################################