subtype, separate the two with a slash, e.g., \*(lqaudio/basic\*(rq.
Note that regardless of the values given to the `\-type' switch, a
multipart content (of any subtype listed above) is always acted upon.
-Further note that if the `\-type' switch is used, and it is desirable to
-act on a message/external-body content, then the `\-type' switch must
-be used twice: once for message/external-body and once for the content
-externally referenced.
.SS "Unseen Sequence"
If the profile entry \*(lqUnseen\-Sequence\*(rq is present and
non\-empty, then
will remove each of the messages shown
from each sequence named by the profile entry.
.SS "Showing the Contents"
+.B Mhshow
+prints messages in a convenient representation.
+If
+.B mhshow
+is outputting to a terminal, then
+a pager will be placed between the terminal and
+.BR mhshow .
+.PP
The headers of each message are displayed with
.B mhl
using the standard format file
the filename if one was missing. As a result, these cannot be used to read
the default temporary file.
.PP
-To get around this, your profile can contain lines of the form:
+To get around this, your profile can contain lines of the forms:
.PP
.RS 5
+.nf
mhshow-suffix-<type>/<subtype>: <suffix>
-.RE
-.PP
-or
-.PP
-.RS 5
mhshow-suffix-<type>: <suffix>
+.fi
.RE
.PP
to specify a suffix which can be automatically added to the temporary
.RS 5
.nf
.ta \w'%F 'u
-%a Insert parameters from Content-Type field
-%e exclusive execution
+%l Display listing prior to displaying content
%f Insert filename containing content
-%F %e, %f, and stdin is terminal not content
-%l display listing prior to displaying content
-%p synonym to %l
+%F %f, but stdin is terminal not content
+%a Insert parameters from Content-Type field
%s Insert content subtype
+%c Insert foreign charset
%d Insert content description
-%% Insert the character %
+%% The character %
.fi
.RE
.PP
-For those display strings containing the e- or F-escape,
-.B mhshow
-will
-execute at most one of these at any given time. Although the F-escape
-expands to be the filename containing the content, the e-escape has no
-expansion as far as the shell is concerned.
+.B Mhshow
+processes the MIME parts serially, i.e. the next display process
+is executed after the previous one has terminated.
.PP
Further, when
.B mhshow
.PP
.RS 5
.nf
-mhshow-show-text/plain: %l<defaultpager> '%F'
-mhshow-show-message/rfc822: %lshow \-file '%F'
+mhshow-show-text/plain: %liconv -f <source-charset>
+mhshow-show-message/rfc822: %lshow \-file %F
.fi
.RE
.PP
.RS 5
.nf
mhshow-show-audio/basic: raw2audio 2>/dev/null | play
-mhshow-show-image: xv '%f'
+mhshow-show-image: xv %f
mhshow-show-application/PostScript: lpr -Pps
.fi
.RE
.PP
-Note that when using the f- or F-escape, it's a good idea to use
-single-quotes around the escape. This prevents misinterpretation by
-the shell of any funny characters that might be present in the filename.
+When expanding %f and %F escapes, the file names get wrapped in
+single-quotes automatically.
.PP
Finally,
.B mhshow
will process each message serially \- it won't start
showing the next message until all the commands executed to display the
-current message have terminated. In the case of a multipart content
-(of any subtype listed above), the content contains advice indicating if
-the parts should be displayed serially or in parallel. Because this may
-cause confusion, particularly on uni-window displays,
+current message have terminated. Although a multipart content may
+contain advice to display the parts in parallel,
.B mhshow
-will never display parts in parallel.
+will never do so.
.SS "Showing Alternate Character Sets"
Because a content of type text might be in a non-ASCII character
set, when
encounters a \*(lqcharset\*(rq parameter for
this content, it checks if your terminal can display this character
set natively.
-.B mhn
-checks this by examining the the environment
-variable
-.BR $MM_CHARSET .
-If the value of this environment variable is equal
-to the value of the charset parameter, then
-.B mhshow
-assumes it can
-display this content without any additional setup. If this environment
-variable is not set,
-.B mhshow
-will assume a value of \*(lqUS-ASCII\*(rq.
-If the character set cannot be displayed natively, then
.B mhshow
-will look for an entry of the form:
-.PP
-.RS 5
-mhshow-charset-<charset>
-.RE
-.PP
-which should contain a command creating an environment to render
-the character set. This command string should containing a single
-\*(lq%s\*(rq, which will be filled-in with the command to display the
-content.
-.PP
-Example entries might be:
-.PP
-.RS 5
-mhshow-charset-iso-8859-1: xterm -fn '-*-*-medium-r-normal-*-*-120-*-*-c-*-iso8859-*' -e %s
-.RE
+checks this by first examining the the environment
+variable
+.B $MM_CHARSET
+and if not set, taking the character encoding of the current locale.
.PP
-or
+If the character set of text/plain cannot be displayed natively, then
+the default display method converts the content automatically by
+piping it through:
.PP
.RS 5
-mhshow-charset-iso-8859-1: '%s'
+iconv -f '<foreign-charset>'
.RE
.PP
-The first example tells
-.B mhshow
-to start
-.B xterm
-and load the
-appropriate character set for that message content. The second example
-tells
-.B mhshow
-that your pager (or other program handling that content
-type) can handle that character set, and that no special processing is
-needed beforehand.
-.PP
-Note that many pagers strip off the high-order bit or have problems
-displaying text with the high-order bit set. However, the pager
-.B less
-has support for single-octet character sets. The source
-to
-.B less
-is available on many ftp sites carrying free software.
-In order to view messages sent in the ISO-8859-1 character set using
-.BR less ,
-.PP
-put these lines in your
-.I \&.login
-file:
+Note that if you have a custom `mhshow-show-*' display string, you
+need to care yourself for converting the encodings.
+(The foreign charset is available through the %c escape.)
.PP
-.RS 5
-.nf
-setenv LESSCHARSET latin1
-setenv LESS "-f"
-.fi
-.RE
+The tool
+.B iconv
+needs to be available.
.PP
-The first line tells
-.B less
-to use the ISO-8859-1 definition for
-determining whether a character is \*(lqnormal\*(rq, \*(lqcontrol\*(lq,
-or \*(lqbinary\*(rq. The second line tells
-.B less
-not to warn you
-if it encounters a file that has non-ASCII characters. Then,
-set the
-.I Pager
-profile entry to
-.BR less ,
-and it will get
-called automatically. (To handle other single-octet character sets,
-look at the
-.BR less (1)
-manual entry for information about the
-.B $LESSCHARDEF
-environment variable.)
+`mhshow-charset-*' profile entries are not supported anymore.
.SS "Messages of Type message/partial"
.B mhshow
cannot directly display messages of type partial.
.BR mhstore (1)
for details.
.SS "External Access"
-For contents of type message/external-body,
-.B mhshow
-supports these access-types:
-.PP
-.IP \(bu 4
-afs
-.IP \(bu 4
-anon-ftp
-.IP \(bu 4
-ftp
-.IP \(bu 4
-local-file
-.IP \(bu 4
-mail-server
-.PP
-For the \*(lqanon-ftp\*(rq and \*(lqftp\*(rq access types,
-.B mhshow
-will look for the \*(lqnmh-access-ftp\*(rq
-profile entry, e.g.,
-.PP
-.RS 5
-nmh-access-ftp: myftp.sh
-.RE
-.PP
-to determine the pathname of a program to perform the FTP retrieval.
-.PP
-This program is invoked with these arguments:
-.PP
-.RS 5
-.nf
-domain name of FTP-site
-username
-password
-remote directory
-remote filename
-local filename
-\*(lqascii\*(rq or \*(lqbinary\*(rq
-.fi
-.RE
-.PP
-The program should terminate with an exit status of zero if the
-retrieval is successful, and a non-zero exit status otherwise.
+.B Mhshow
+does not automatically retrieve message/external-body parts (anymore),
+but prints the relevant information to enable the user to retrieve
+the files manually.
.SS "User Environment"
Because the display environment in which
.B mhshow
^Path:~^To determine the user's mail storage
^Current\-Folder:~^To find the default current folder
^Unseen\-Sequence:~^To name sequences denoting unseen messages
-^nmh-access-ftp:~^Program to retrieve contents via FTP
-^mhshow-charset-<charset>~^Template for environment to render character sets
^mhshow-show-<type>*~^Template for displaying contents
-^Pager:~^Default program to display text/plain content
+^Pager:~^Program to use as interactive front\-end
.fi
.SH "SEE ALSO"
projects / mmh / blobdiff