Exiv2

#! /usr/bin/env python

# ----------------------------------------------------------------------

# Settings

vardir = "."

date_format = "%d-%b-%Y"

# ----------------------------------------------------------------------

# functions

def usage():

   print("""Usage: gen.py file.in [...]

   Substitute placeholders in input files with content

   """)

def gen_html(file):

   """Replace variables in the file with their content"""

   text = open(file).read()

   for var in vars:

      vartext = open(vardir + "/" + var).read()

      text = text.replace(var, vartext)

   text = last_modified(text)

   return text

def last_modified(text):

   """Substitute variable __last_modified__ with the current date"""

   date = time.strftime(date_format, time.localtime())

   text = text.replace("__last_modified__", date)

   return text

# ----------------------------------------------------------------------

# main

import sys

import os

import re

import time

# Check command line arguments

if len(sys.argv) == 1:

   usage()

   sys.exit()

# The input files from the command line

input = sys.argv[1:]

# Get a list of all variables (files in the form __*__) from vardir 

vars = os.listdir(vardir)

for i in range(len(vars)-1, -1, -1):

   if re.match("^__.*__$", vars[i]): continue

   del vars[i]

vars.sort()

# Substitute variables in all input files

print("Substituting variables {0}".format(vars))

for file in input:

   print("Processing {0}...".format(file))

   text = gen_html(file)

   file = file.replace(".in", "")

   open(file, 'w').write(text)