Mr Zaug wrote:
> I need to generate a config file based on an existing "template" file. I
> need to replace a set of strings with other strings globally in the
> generated file.
>
> Here is a snippet of the template file, where CONTENT_PATH and DAMPATH are
> two "placeholders" or variables. There are several other such
> placeholders.
>
> $include "_dispatcher_publish_filters.any"
> /1000 { /type "allow" /glob "* /CONTENT_PATH/*.html*" }
> /1001 { /type "allow" /glob "POST /DAMPATH/www/*.html *" }
>
> The script's user will be asked to type in unique values when prompted for
> DAMPATH or CONTENT_PATH.
>
> Since I know the variables themselves are not going to change (because the
> contents of the template file don't spontaneously change) should I be
> using regex to search for them or is there a better way? I was planning on
> using re.sub but I don't know whether that's the best way. Here's what my
> script looks like today.
>
> from sys import argv
> import re
> from os.path import exists
>
> script, template_file = argv
> print "Opening the template file..."
>
> in_file = open(template_file)
> lines = in_file.readlines()
>
> print "What is the serial number of the site?",
> _NNN = raw_input()
>
> print "What is the brand, or product name?",
> _BRAND = raw_input()
>
> print "What is the content path?",
> _CONTENT_PATH = raw_input()
>
> out_file = open(_nnn + _brand + "_farm.any", 'w')
>
> for line in lines:
> re.sub('NNN', _NNN, line)
> re.sub('BRAND, _BRAND', line)
> re.sub('CONTENT_PATH', _CONTENT_PATH, line)
>
> out_file.close()
There are many templating systems out there. Pick the one that suits you
best. A very basic one is str.format():
>>> "{foo} {bar}".format(foo=1, bar=2)
'1 2'
Here's what your script might become if you choose that one:
$ cat interactive_template.txt
$include "_dispatcher_publish_filters.any"
/1000 {{ /type "allow" /glob "* /{CONTENT_PATH}/*.html*" }}
/1001 {{ /type "allow" /glob "POST /{DAMPATH}/www/*.html *" }}
$ cat interactive_template.py
try:
format_map = str.format_map
except AttributeError: # python 2 compatibility
import string
def format_map(text, lookup):
return string.Formatter().vformat(text, (), lookup)
input = raw_input
class Lookup(dict):
def __missing__(self, key):
self[key] = value = input("{}: ".format(key))
return value
def main():
import argparse
parser = argparse.ArgumentParser()
parser.add_argument("template_file")
parser.add_argument("generated_file", nargs="?")
args = parser.parse_args()
with open(args.template_file) as instream:
template_text = instream.read()
lookup = Lookup()
generated_text = format_map(template_text, lookup)
generated_file = args.generated_file
if generated_file is None:
generated_file = format_map("{nnn}{brand}_farm.any", lookup)
print("Writing {}".format(generated_file))
with open(generated_file, "w") as outstream:
outstream.write(generated_text)
if __name__ == "__main__":
main()
$ python interactive_template.py interactive_template.txt
CONTENT_PATH: foo
DAMPATH: bar
nnn: baz
brand: ham
Writing bazham_farm.any
$ cat bazham_farm.any
$include "_dispatcher_publish_filters.any"
/1000 { /type "allow" /glob "* /foo/*.html*" }
/1001 { /type "allow" /glob "POST /bar/www/*.html *" }
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