X-Git-Url: https://git.phdru.name/?a=blobdiff_plain;f=mimedecode.docbook;h=401197944585dd8bcc1656d430a7841dbdc3a89d;hb=607e68504d32244e26d4a4c01532f5168f03f4e8;hp=ac1d7ea40344cf215077683bab30e3c113298c97;hpb=49e07178e7847c463e37dc9d9241fb06d7cd210a;p=mimedecode.git
diff --git a/mimedecode.docbook b/mimedecode.docbook
index ac1d7ea..4011979 100644
--- a/mimedecode.docbook
+++ b/mimedecode.docbook
@@ -41,20 +41,56 @@
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DESCRIPTION
Mail users, especially in non-English countries, often find that mail
-messages arrived in different formats, with different content types, in
-different encodings and charsets. Usually it is good because it allows to use
-an appropriate format/encoding/whatever. Sometimes, though, some unification is
-desirable. For example, one may want to put mail messages into an archive,
-make HTML indices, run search indexer, etc. In such situations converting
-messages to text in one character set and skipping some binary attachments is
-much desirable.
+ messages arrived in different formats, with different content types, in
+ different encodings and charsets. Usually it is good because it allows to
+ use an appropriate format/encoding/whatever. Sometimes, though, some
+ unification is desirable. For example, one may want to put mail messages
+ into an archive, make HTML indices, run search indexer, etc. In such
+ situations converting messages to text in one character set and skipping
+ some binary attachments is much desirable.
@@ -85,21 +121,23 @@ much desirable.
This is a program to decode MIME messages. The program expects one input
-file (either on command line or on stdin) which is treated as an RFC822
-message, and decodes to stdout or an output file. If the file is not an RFC822
-message it is just copied to the output one-to-one. If the file is a simple
-RFC822 message it is decoded as one part. If it is a MIME message with multiple
-parts ("attachments") all parts are decoded. Decoding can be controlled by
-command-line options.
+ file (either on command line or on stdin) which is treated as an RFC822
+ message, and decodes to stdout or an output file. If the file is not an
+ RFC822 message it is just copied to the output one-to-one. If the file is a
+ simple RFC822 message it is decoded as one part. If it is a MIME message
+ with multiple parts ("attachments") all parts are decoded. Decoding can be
+ controlled by command-line options.
- First, Subject and Content-Disposition headers are examined. If any of those
- exists, it is decoded according to RFC2047. Content-Disposition header is
- not decoded - only its "filename" parameter. Encoded header parameters
- violate the RFC, but widely deployed anyway by ignorant coders who never
- even heard about RFCs. Correct parameter encoding specified by RFC2231. This
- program decodes RFC2231-encoded parameters, too.
+ First, for every part the program removes headers and parameters listed with
+ -r and -R options. Then, Subject and Content-Disposition headers (and all
+ headers listed with -d and -p options) are examined. If any of those exists,
+ they are decoded according to RFC2047. Content-Disposition header is not
+ decoded - only its "filename" parameter. Encoded header parameters violate
+ the RFC, but widely deployed anyway by ignorant coders who never even heard
+ about RFCs. Correct parameter encoding specified by RFC2231. This program
+ decodes RFC2231-encoded parameters, too.
@@ -113,16 +151,23 @@ command-line options.
than POSIX, please don't ask me; real OS users can consult my example at
http://phdru.name/Software/dotfiles/mailcap.html).
The decoding process uses the first copiousoutput filter it can find. If
- there is no any filter the body just passed as is.
+ there are no filters the body just passed as is.
Then Content-Type header is consulted for charset. If it is not equal to the
- current locale charset the body text is recoded. Finally message headers and
- the body are flushed to stdout.
+ current locale charset and recoding is allowed the body text is recoded.
+ Finally message headers and the body are flushed to stdout.
+
+
+ Please be warned that in the following options asterisk is a shell
+ metacharacter and should be escaped or quoted. Either write -d \*,-h1,-h2
+ or -d '*,-h1,-h2' or such.
+
+OPTIONS
@@ -151,8 +196,8 @@ command-line options.
-c
- Recode different character sets in message body to current default
- charset; this is the default.
+ Recode different character sets in message bodies to the current
+ default charset; this is the default.
@@ -161,7 +206,17 @@ command-line options.
-C
- Do not recode character sets in message body.
+ Do not recode character sets in message bodies.
+
+
+
+
+
+ -f charset
+
+
+ Force this charset to be the current default charset instead of
+ the current locale.
@@ -178,21 +233,25 @@ command-line options.
- -f charset
+ -d header1[,header2,header3...]
- Force this charset to be the current default charset instead of
- the current locale.
+ Add the header(s) to a list of headers to decode; initially the
+ list contains headers "From", "To", "Cc", "Reply-To",
+ "Mail-Followup-To" and "Subject".
- -d header
+ -d *[,-header1,-header2,-header3...]
- Add the header to a list of headers to decode; initially the list
- contains headers "From", "To" and "Subject".
+ This variant completely changes headers decoding. First, the list of
+ headers to decode is cleared. Then all the headers are decoded
+ except the given list of exceptions (headers listed with '-'). In
+ this mode it would be meaningless to give more than one -d options
+ but the program doesn't enforce it.
@@ -207,13 +266,42 @@ command-line options.
- -p header:param
+ -p header1[,header2,header3,...]:param1[,param2,param3,...]
- Add the pair (header, param) to a list of headers' parameters to
- decode; initially the list contains header "Content-Type",
- parameter "name" and header "Content-Disposition", parameter
- "filename".
+ Add the parameters(s) to a list of headers parameters to decode;
+ the parameters will be decoded only for the given header(s).
+ Initially the list contains header "Content-Type", parameter "name";
+ and header "Content-Disposition", parameter "filename".
+
+
+
+
+
+ -p *[,-header1,-header2,-header3,...]:param1[,param2,param3,...]
+
+
+ Add the parameters(s) to a list of headers parameters to decode;
+ the parameters will be decoded for all headers except the given
+ ones.
+
+
+
+
+
+ -p header1[,header2,header3,...]:*[,-param1,-param2,-param3,...]
+
+
+ Decode all parameters except listed for the given list of headers.
+
+
+
+
+
+ -p *[,-header1,-header2,-header3,...]:*[,-param1,-param2,-param3,...]
+
+
+ Decode all parameters except listed for all headers (except listed).
@@ -222,7 +310,75 @@ command-line options.
-P
- Clear the list of headers' parameters to decode (make it empty).
+ Clear the list of headers parameters to decode (make it empty).
+
+
+
+
+
+ -r header1[,header2,header3...]
+
+
+ Add the header(s) to a list of headers to remove completely;
+ initially the list is empty.
+
+
+
+
+
+ -r *[,-header1,-header2,-header3...]
+
+
+ Remove all headers except listed.
+
+
+
+
+
+ -R header1[,header2,header3,...]:param1[,param2,param3,...]
+
+
+ Add the parameters(s) to a list of headers parameters to remove;
+ the parameters will be decoded only for the given header(s).
+ Initially the list is empty.
+
+
+
+
+
+ -R *[,-header1,-header2,-header3,...]:param1[,param2,param3,...]
+
+
+
+ -R header1[,header2,header3,...]:*[,-param1,-param2,-param3,...]
+
+
+
+ -R *[,-header1,-header2,-header3,...]:*[,-param1,-param2,-param3,...]
+
+
+ Remove listed parameters (or all parameters except listed) frome
+ these headers (or from all headers except listed).
+
+
+
+
+
+ --set-header header:value
+
+
+ The program sets or changes value for the header to the given value
+ (only at the top-level message).
+
+
+
+
+
+ --set-param header:param=value
+
+
+ The program sets or changes value for the header's parameter to the
+ given value (only at the top-level message). The header must exist.
@@ -238,6 +394,16 @@ command-line options.
+
+ -B mask
+
+
+ Append mask to the list of binary content types that will be not
+ content-transfer-decoded (will be left as base64 or such).
+
+
+
+
-e mask
@@ -284,11 +450,11 @@ cat input_file | mimedecode.py -o output_file
- The 4 list options (-beit) require more explanation. They allow a user
-to control body decoding with great flexibility. Think about said mail
-archive; for example, its maintainer wants to put there only texts, convert
-Postscript/PDF to text, pass HTML and images as is, and ignore everything
-else. Easy:
+ The 5 list options (-Bbeit) require more explanation. They allow a user to
+ control body decoding with great flexibility. Think about said mail archive;
+ for example, its maintainer wants to put there only texts, convert
+ Postscript/PDF to text, pass HTML and images as is, and ignore everything
+ else. Easy:
@@ -335,12 +501,13 @@ the program always uses the default decoding.
BUGS
The program may produce incorrect MIME message. The purpose of the program
-is to decode whatever it is possible to decode, not to produce absolutely
-correct MIME output. The incorrect parts are obvious - decoded Subject headers
-and filenames. Other than that output is correct MIME message. The program does
-not try to guess whether the headers are correct. For example, if a message
-header states that charset is iso8859-5, but the body is actually in utf-8
-the program will recode the message with the wrong charset.
+ is to decode whatever it is possible to decode, not to produce absolutely
+ correct MIME output. The incorrect parts are obvious - decoded
+ From/To/Cc/Reply-To/Mail-Followup-To/Subject headers and filenames. Other
+ than that output is correct MIME message. The program does not try to guess
+ whether the headers are correct. For example, if a message header states
+ that charset is iso8859-5, but the body is actually in utf-8 the program
+ will recode the message with the wrong charset.