* Peter Otten <__pete...@web.de> [2016-10-19 16:52:50 +0200]:
> Date: Wed, 19 Oct 2016 16:52:50 +0200
> From: Peter Otten <__pete...@web.de>
> To: tutor@python.org
> Subject: Re: [Tutor] Subdividing config file by matching line from a file
> Organization: None
> User-Agent: KNode/4.13.3
> Message-ID: <nu81c2$6g8$1...@blaine.gmane.org>
>
> Toni Fuente via Tutor wrote:
>
> > Hello everybody,
> >
> > I am trying to divide a configuration file (configs) in the form of:
> >
> > <VirtualHost xxx.xxx.xxx.xxx>
> > ServerAdmin webmas...@foo.com
> > ServerName www.foo.com
> > DocumentRoot /home/public/web/htdocs/foo.com
> > ScriptAlias /cgi-bin/ /home/public/web/htdocs/foo.com/cgi-bin/
> > </VirtualHost>
> >
> > [...]
> >
> > <VirtualHost xxx.xxx.xxx.xxx>
> > ServerAdmin webmas...@bar.com
> > ServerName www.bar.com
> > DocumentRoot /home/public/web/htdocs/bar.com/
> > </VirtualHost>
> >
> > [...]
> >
> >
> > into different individual config files for the different domains.
> >
> > In a different file (sites), I've got a list of domains.
> >
> > foo.com
> > example.com
> > blabla.com
> > [...]
> >
> > I've approached this problem by creating first a list of all the config
> > "chunks" with this piece of code:
> >
> >
> > #!/usr/bin/python
> >
> > token = '\n'
> > chunks = []
> > current_chunk = []
> >
> >
> > for line in open('configs'):
> > if line.startswith(token) and current_chunk:
> > # if line starts with token and the current chunk is not empty
> > chunks.append(current_chunk[:]) # add not empty chunk to chunks
> > current_chunk = [] # make current chunk blank
> > # just append a line to the current chunk on each iteration
> > current_chunk.append(line)
> >
> > chunks.append(current_chunk) # append the last chunk outside the loop
> >
> >
> > Dividing the chunks of confg by blank line: token='\n' into a list of
> > lists.
> >
> > And now I am stuck trying to iterate through the chunks list, and iterate
> > through the sites file trying to find the "site" string and if found,
> > print the entire "chunk", which will be send to a personal site
> > configuration file. Like so:
> >
> > for item in chunks:
> > #print item
> > for line in open('sites'):
> > #print line
> > for i in item:
> > if line not in i:
> > continue
> > else:
> > print item
> > break
> >
> > I don't get the results that I am expecting. Is is the right way to
> > approach this problem? Any direction will be very helpful.
> >
> > Thank you in advance,
> >
>
> You have to search all chunks for a specific site, i. e. you need the outer
> loop to iterate over the sites and the inner loops (repeatedly) over the
> chunks. It is easier to see the structure when you factor the site-search
> into its own function:
>
> def find_chunk(site, chunks):
> for chunk in chunks:
> if any(site in line for line in chunk):
> return chunk
> return None # no appropriate chunk found
> # (you might instead raise an Exception)
>
>
> for line in open("sites"):
> site = line.strip()
> chunk = find_chunk(site, chunks)
> if chunk is not None:
> print "Site:", site
> print "Config:"
> print "".join(chunk)
> else:
> print >> sys.stderr, "no configuration for site", site
> print "---"
>
> (If the number of chunks were huge you'd build some kind of lookup table
> mapping site to chunk, but in your case this is hardly worthwile)
>
> _______________________________________________
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Thank you Peter, that help me a lot, I can see now better what I am
doing.
--
Toni
Sólo la verdad os hará libres.
-- San Juan. (Siglo I) Apóstol cristiano.
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