-.TH MHFIXMSG %manext1% "February 24, 2016" "%nmhversion%"
+.TH MHFIXMSG %manext1% "October 3, 2016" "%nmhversion%"
.\"
.\" %nmhwarning%
.\"
.HP 5
.na
.B mhfixmsg
+.RB [ \-help ]
+.RB [ \-version ]
.RI [ +folder ]
.RI [ msgs " | "
.IR "absolute pathname" " | "
.RB \-file
.IR file ]
.RB [ \-decodetext
-8bit/7bit |
+8bit|7bit|binary |
.BR \-nodecodetext ]
.RB [ \-decodetypes
.IR "type/[subtype][,...]" ]
.RB [ \-normmproc ]
.RB [ \-changecur " | " \-nochangecur ]
.RB [ \-verbose " | " \-noverbose ]
-.RB [ \-version ]
-.RB [ \-help ]
.ad
.SH DESCRIPTION
.B mhfixmsg
.B mhfixmsg
passes non-MIME messages through without any transformations. If no
transformations apply to a MIME message, the original message or file
-is not modified or removed.
+is not modified or removed. Thus,
+.B mhfixmsg
+can safely be run multiple times on a message.
.PP
The
.B \-decodetext
switch enables a transformation to decode each base64 and
-quoted-printable text message part to the selected 8bit or 7bit
-encoding. If 7bit is selected for a base64 part but it will only fit
+quoted-printable text message part to the selected 8bit, 7bit, or
+binary encoding.
+If 7bit is selected for a base64 part but it will only fit
8bit, as defined by RFC 2045, then it will be decoded to 8bit
-quoted-printable. Otherwise, if the decoded text would not fit the
-selected encoding, the part is not decoded (and a message will be
+quoted-printable.
+Similarly, with 8bit, if the decoded text would be binary,
+then the part is not decoded (and a message will be
displayed if
.B \-verbose
-is enabled).
+is enabled). Note that
+.B \-decodetext
+binary can produce messages that are not RFC 2045 compliant.
.PP
When the
.B \-decodetext
.B \-fixcte
switch enables a transformation to change the
Content-Transfer-Encoding from an invalid value to 8bit in message
-parts with a Content-Type of multipart, as required by RFC 2045,
-§6.4. That condition is indicated by a \*(lqmust be encoded in
-7bit, 8bit, or binary\*(rq error message from
+parts with a Content-Type of multipart and message, as required by
+RFC 2045, §6.4. That condition is indicated by a \*(lqmust be
+encoded in 7bit, 8bit, or binary\*(rq error message from
.B mhlist
and other
.B nmh
message types.
.PP
.B mhfixmsg
-applies one transformation unconditionally: it removes an extraneous
-trailing semicolon from the parameter lists of MIME header fields.
+applies two transformations unconditionally.
+The first removes an extraneous trailing semicolon from the parameter
+lists of MIME header field values.
+The second replaces RFC 2047 encoding with RFC 2231 encoding of name
+and filename parameters in Content-Type and Content-Disposition header
+field values, respectively.
.PP
The
.B \-verbose
is 0 if all of the requested transformations are performed, or
non-zero otherwise.
.RB ( mhfixmsg
-will not decode to binary content, but a request to do so is
-not considered a failure, and is noted with
+will not decode to binary content with the default
+.B \-decodetext
+setting, but a request to do so is not considered a failure, and is noted
+with
.BR \-verbose .)
If a problem is detected with any one of multiple messages such that
the return status is non-zero, then none of the messages will be
.ta \w'\-crlflinebreaks 'u
\-decodetext base64 and quoted-printable encoded text parts
\-decodetypes limits parts to which -decodetext applies
-\-crlflinebreaks text parts
+\-crlflinebreaks text parts
\-textcharset text/plain parts
\-reformat text parts that are not text/plain
\-fixboundary outermost multipart part
-\-fixcte multipart part
+\-fixcte multipart or message part
\-fixtype all except multipart and message parts
.fi
.RE
-.PP
.SS "Backup of Original Message/File"
If it applies any transformations to a message or file,
and the
profile component and negates all prior
.B \-rmmproc
switches.
-.PP
.SS "Integration with inc"
.B mhfixmsg
can be used as an add-hook, as described in %docdir%/README-HOOKS.
sets with the newly incorporated messages. Those could then be
supplied to
.BR mhfixmsg .
+An example is shown below.
.SS "Integration with procmail"
By way of example, here is an excerpt from a procmailrc file
that filters messages through
.nf
.ta \w'\-fixboundary 'u
PATH = %bindir%:$PATH
+LANG = en_US.utf8
MAILDIR = `mhparam path`
#### The Backups directory is relative to MAILDIR.
MKSTEMP = 'mkstemp -directory Backups -prefix mhfixmsg'
| tee `$MKSTEMP` | $MHFIXMSG | $STORE +nmh-workers
.fi
.RE
+.SH "EXAMPLES"
+.PP
+.SS Basic usage
+To run
+.B mhfixmsg
+on the current message in the current folder, with default transformations to
+fix MIME boundaries and Content-Transfer-Encoding, to decode text and
+application/ics content parts to 8 bit, and to add a corresponding text/plain
+part where lacking:
.PP
+.RS
+.nf
+mhfixmsg -verbose
+.fi
+.RE
+.SS Specified folder and messages
+To run
+.B mhfixmsg
+on specified messages, without its informational output:
+.PP
+.RS
+.nf
+mhfixmsg +inbox last:4
+.fi
+.RE
+.SS View without modification
+By default,
+.B mhfixmsg
+transforms the message in place. To view the MIME structure that would result from running
+.B mhfixmsg
+on the current message, without modifying the message:
+.PP
+.RS
+.nf
+mhfixmsg -outfile - | mhlist -file -
+.fi
+.RE
+.SS Search message without modification
+To search the current message, which possibly contains base64 or quoted printable encoded text parts,
+without modifiying it, use the -outfile switch:
+.PP
+.RS
+.nf
+mhfixmsg -outfile - | grep \fIpattern\fR
+.fi
+.RE
+.PP
+-outfile can be abbreviated in usual MH fashion, e.g., to -o. The search will be
+on the entire message, not just text parts.
+.SS Translate text/plain parts to UTF-8
+To translate all text/plain parts in the current message to UTF-8, in addition
+to all of the default transformations:
+.PP
+.RS
+.nf
+mhfixmsg -textcharset utf-8
+.fi
+.RE
+.SS Fix all messages in a folder
+To run
+.B mhfixmsg
+on all of the messages in a folder, using a Bourne shell loop:
+.PP
+.RS
+.nf
+for msg in `pick +folder`; do mhfixmsg $msg; done
+.fi
+.RE
+.PP
+.B mhfixmsg
+can be run on more than one message, but on a large number of messages
+may attempt to open too many files.
+.SS Run on newly incorporated messages
+To run
+.B mhfixmsg
+on messages as they are incorporated:
+.PP
+.RS
+.nf
+inc && mhfixmsg -nochangecur unseen
+.fi
+.RE
+.PP
+This assumes that the Unseen-Sequence profile entry is set to
+.BR unseen ,
+as shown in the mh\-profile(5) man page.
.SH FILES
.B mhfixmsg
looks for mhn.defaults in multiple locations: absolute pathnames are
.RB ` +folder "' defaults to the current folder"
.RB ` msgs "' defaults to cur"
.RB ` "\-decodetext 8bit"'
-.RB ` "\-decodetypes text"'
+.RB ` "\-decodetypes text,application/ics"'
.RB ` \-crlflinebreaks '
.RB ` \-notextcharset '
.RB ` \-reformat '
.B \-file
switch or an absolute pathname is used, the context will not be
modified.
+.SH BUGS
+.B mhfixmsg
+opens files internally for decoding and character set conversion, and apparently does not
+close them expeditiously. Until that is resolved, it is recommended that
+.B mhfixmsg
+not be run on a large number of messages at once, as noted in the EXAMPLES above.
projects / nmh / blobdiff