Template filler

fimplate.py

@@ -0,0 +1,69 @@
+#!/usr/bin/python
+
+import sys
+import os
+import re
+from argparse import ArgumentParser 
+from argparse import RawTextHelpFormatter
+
+def setup_options():
+    parser=ArgumentParser(description="""Template Filler
+    
+=== Template example: ===
+  Hello [[name]]!
+
+
+== Value file/Value pair example: ==
+[[name]]=John 
+    """,formatter_class=RawTextHelpFormatter)
+    parser.add_argument("-f",action="store",dest="file",
+                      help="File name to read keys/values.")
+    parser.add_argument("-p",action="append",dest="values",default=[],
+                     help="key=value pairs. This option may be issued several times.")
+    parser.add_argument('template', action="store", nargs='?',
+                    help="Template file to be filled. If not defined, stdin used.")
+    options=parser.parse_args()
+    return options
+
+def parse_file(filename):
+    pairs=[]
+    with open(filename,"r") as reader:
+        for i,l in enumerate(reader):
+            l=l.rstrip("\n\r")
+            if len(l)==0:
+                continue
+            tokens = l.split('=', 1)
+            if len(tokens)!=2:
+                print("File %s:%i key=value pair '%s' does not parse"%(filename,i+1,l,))
+                sys.exit(1) 
+            pairs.append( (tokens[0], tokens[1].decode('string_escape')) )
+    return pairs
+
+def parse_arguments(args):
+    pairs=[]
+    for p in args:
+        tokens = p.split('=', 1)
+        if len(tokens)!=2:
+            print("Argument key=value pair '%s' does not parse"%(p,))
+            sys.exit(1) 
+        pairs.append( (tokens[0], tokens[1].decode('string_escape')) )
+    return pairs
+
+def main():
+    options=setup_options();
+    pairs=[]
+    if options.file!=None:
+        pairs.extend(parse_file(options.file))
+    pairs.extend(parse_arguments(options.values))
+    if options.template==None:
+        in_reader=sys.stdin
+    else:
+        in_reader=open(options.template,'rb')
+    for l in in_reader:
+        for p in pairs:
+            l=l.replace(p[0],p[1])
+        sys.stdout.write(l)
+        
+if __name__ == "__main__":
+    main()
+