Decode "To" header by default

[mimedecode.git] / mimedecode.py

diff --git a/mimedecode.py b/mimedecode.py
index 9aab1b3e93c499fd9df152484b8481d0dd411f0e..b57bd956557624acb899fc786ddfbbb72b7f24cf 100755 (executable)
--- a/mimedecode.py
+++ b/mimedecode.py
@@ -6,11 +6,6 @@ from mimedecode_version import __version__, __author__, __copyright__, __license
 import sys, os
 import email
 
-try:
-    from cStringIO import StringIO
-except ImportError:
-    from StringIO import StringIO
-
 me = os.path.basename(sys.argv[0])
 
 
@@ -30,9 +25,6 @@ Usage: %s [-h|--help] [-V|--version] [-cCDP] [-H|--host=hostname] [-f charset] [
     sys.exit(code)
 
 
-def output(s):
-    gopts.outfile.write(s)
-
 def output_headers(msg):
     unix_from = msg.get_unixfrom()
     if unix_from:
@@ -98,9 +90,11 @@ def decode_header_param(msg, header, param):
             from types import TupleType
             if isinstance(value, TupleType):
                 new_value = _decode_header_param(value)
+                changed = new_value <> value[2]
             else:
                 new_value = _decode_header(value)
-            if new_value <> value: # do not bother to touch msg if not changed
+                changed = new_value <> value
+            if changed: # do not bother to touch msg if not changed
                 msg.set_param(param, new_value, header)
 
 
@@ -188,12 +182,6 @@ def recode_charset(msg, s):
 def totext(msg, instring):
     "Convert instring content to text"
 
-    if msg.is_multipart(): # Recursively decode all parts of the multipart message
-        newfile = StringIO(msg.as_string())
-        newfile.seek(0)
-        decode_file(newfile)
-        return
-
     # Decode body and recode charset
     s = decode_body(msg, instring)
     if gopts.recode_charset:
@@ -245,34 +233,40 @@ def decode_part(msg):
     totext(msg, outstring)
 
 
-def decode_file(infile):
-    "Decode the entire message"
+def decode_multipart(msg):
+    "Decode multipart"
 
-    msg = email.message_from_file(infile)
-    boundary = msg.get_boundary()
+    decode_headers(msg)
+    output_headers(msg)
 
-    if msg.is_multipart():
-        decode_headers(msg)
-        output_headers(msg)
+    if msg.preamble: # Preserve the first part, it is probably not a RFC822-message
+        output(msg.preamble) # Usually it is just a few lines of text (MIME warning)
 
-        if msg.preamble: # Preserve the first part, it is probably not a RFC822-message
-            output(msg.preamble) # Usually it is just a few lines of text (MIME warning)
+    boundary = msg.get_boundary()
 
-        for subpart in msg.get_payload():
+    for subpart in msg.get_payload():
+        if boundary:
             output("\n--%s\n" % boundary)
-            decode_part(subpart)
 
+        # Recursively decode all parts of the subpart
+        decode_message(subpart)
+
+    if boundary:
         output("\n--%s--\n" % boundary)
 
-        if msg.epilogue:
-            output(msg.epilogue)
+    if msg.epilogue:
+        output(msg.epilogue)
 
-    else:
-        if msg.has_key("Content-Type"): # Simple one-part message - decode it
-            decode_part(msg)
 
-        else: # Not a message, just text - copy it literally
-            output(msg.as_string())
+def decode_message(msg):
+    "Decode message"
+
+    if msg.is_multipart():
+        decode_multipart(msg)
+    elif len(msg): # Simple one-part message (there are headers) - decode it
+        decode_part(msg)
+    else: # Not a message, just text - copy it literally
+        output(msg.as_string())
 
 
 class GlobalOptions:
@@ -281,7 +275,7 @@ class GlobalOptions:
 
     host_name = None
 
-    decode_headers = ["From", "Subject"] # A list of headers to decode
+    decode_headers = ["From", "To", "Subject"] # A list of headers to decode
     decode_header_params = [
         ("Content-Type", "name"),
         ("Content-Disposition", "filename"),
@@ -350,9 +344,12 @@ if __name__ == "__main__":
     la = len(arguments)
     if la == 0:
         gopts.input_filename = '-'
-        gopts.output_filename = '-'
         infile = sys.stdin
-        outfile = sys.stdout
+        if gopts.output_filename:
+            outfile = open(gopts.output_filename, 'w')
+        else:
+            gopts.output_filename = '-'
+            outfile = sys.stdout
     elif la in (1, 2):
         if (arguments[0] == '-'):
             gopts.input_filename = '-'
@@ -388,7 +385,10 @@ if __name__ == "__main__":
         gopts.host_name = socket.gethostname()
 
     gopts.outfile = outfile
-    decode_file(infile)
+    output = outfile.write
 
-    infile.close()
-    outfile.close()
+    try:
+        decode_message(email.message_from_file(infile))
+    finally:
+        infile.close()
+        outfile.close()