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mhl - produce formatted listings of nmh messages


/usr/lib/mh/mhl [-bell | -nobell] [-clear | -noclear] [-folder +folder] [-form formfile]
[-length lines] [-width columns] [-moreproc program] [-nomoreproc] [-fmtproc program]
[-nofmtproc] [files ...] [-version] [-help]


Mhl is an nmh command for filtering and/or displaying text messages. It is the default
method of displaying text messages for nmh (it is the default showproc).

As with more, each of the messages specified as arguments (or the standard input) will be
output. If more than one message file is specified, the user will be prompted prior to
each one, and a <RETURN> or <EOT> will begin the output, with <RETURN> clearing the screen
(if appropriate), and <EOT> (usually CTRL-D) suppressing the screen clear. An <INTERRUPT>
(usually CTRL-C) will abort the current message output, prompting for the next message (if
there is one), and a <QUIT> (usually CTRL-\) will terminate the program (without core

The -bell option tells mhl to ring the terminal's bell at the end of each page, while the
-clear option tells mhl to clear the screen at the end of each page (or output a formfeed
after each message). Both of these switches (and their inverse counterparts) take effect
only if the profile entry moreproc is defined but empty, and mhl is outputting to a
terminal. If the moreproc entry is defined and non-empty, and mhl is outputting to a
terminal, then mhl will cause the moreproc to be placed between the terminal and mhl and
the switches are ignored. Furthermore, if the -clear switch is used and mhl's output is
directed to a terminal, then mhl will consult the $TERM and $TERMCAP environment variables
to determine the user's terminal type in order to find out how to clear the screen. If
the -clear switch is used and mhl's output is not directed to a terminal (e.g., a pipe or
a file), then mhl will send a formfeed after each message.

To override the default moreproc and the profile entry, use the -moreproc program switch.
Note that mhl will never start a moreproc if invoked on a hardcopy terminal.

The -length length and -width width switches set the screen length and width,
respectively. These default to the values indicated by $TERMCAP, if appropriate,
otherwise they default to 40 and 80, respectively.

The default format file used by mhl is called “mhl.format”. mhl will first search for
this file in the user's nmh directory, and will then search in the directory /etc/nmh.
This default can be changed by using the -form formatfile switch.

Finally, the -folder +folder switch sets the nmh folder name, which is used for the
“messagename:” field described below. The environment variable $mhfolder is consulted for
the default value, which show, next, and prev initialize appropriately.

Mhl operates in two phases: 1) read and parse the format file, and 2) process each message
(file). During phase 1, an internal description of the format is produced as a structured
list. In phase 2, this list is walked for each message, outputting message information
under the format constraints from the format file.

The format file can contain information controlling screen clearing, screen size,
wrap-around control, transparent text, component ordering, and component formatting.
Also, a list of components to ignore may be specified, and a couple of “special”
components are defined to provide added functionality. Message output will be in the
order specified by the order in the format file.

Each line of a format file has one of the following forms:


· A line beginning with a `;' is a comment, and is ignored.

· A line beginning with a `:' is clear text, and is output exactly as is.

· A line containing only a `:' produces a blank line in the output.

· A line beginning with “component:” defines the format for the specified component,

· Remaining lines define the global environment.

For example, the line:


defines the screen size to be 80 columns by 40 rows, specifies that the screen should be
cleared prior to each page, that the overflow indentation is 5, and that overflow text
should be flagged with “***”.

Following are all of the current variables and their arguments. If they follow a
component, they apply only to that component, otherwise, their affect is global. Since
the whole format is parsed before any output processing, the last global switch setting
for a variable applies to the whole message if that variable is used in a global context
(i.e., bell, clearscreen, width, length).

variable type semantics
width integer screen width or component width
length integer screen length or component length
offset integer positions to indent “component: ”
overflowtext string text to use at the beginning of an
overflow line
overflowoffset integer positions to indent overflow lines
compwidth integer positions to indent component text
after the first line is output
uppercase flag output text of this component in all
upper case
nouppercase flag don't uppercase
clearscreen flag/G clear the screen prior to each page
noclearscreen flag/G don't clearscreen
bell flag/G ring the bell at the end of each page
nobell flag/G don't bell
component string/L name to use instead of “component” for
this component
nocomponent flag don't output “component: ” for this
center flag center component on line (works for
one-line components only)
nocenter flag don't center
leftadjust flag strip off leading whitespace on each
line of text
noleftadjust flag don't leftadjust
compress flag change newlines in text to spaces
nocompress flag don't compress
wrap flag Wrap lines that exceed width (default)
nowrap flag Do not perform line wrapping
split flag don't combine multiple fields into
a single field
nosplit flag combine multiple fields into
a single field
newline flag print newline at end of components
(this is the default)
nonewline flag don't print newline at end of components
formatfield string format string for this component
(see below)
decode flag decode text as RFC 2047 encoded
header field
addrfield flag field contains addresses
datefield flag field contains dates
format flag Run component through formatproc filter
(body only)
noformat flag Do not run component through
formatproc filter (default)
formatarg string Argument to format filter

To specify the value of integer-valued and string-valued variables, follow their name with
an equals-sign and the value. Integer-valued variables are given decimal values, while
string-valued variables are given arbitrary text bracketed by double-quotes. If a value
is suffixed by “/G” or “/L”, then its value is useful in a global-only or local-only
context (respectively).

A line of the form:


specifies a list of components which are never output.

The component “MessageName” (case-insensitive) will output the actual message name (file
name) preceded by the folder name if one is specified or found in the environment. The
format is identical to that produced by the -header option to show.

The component “Extras” will output all of the components of the message which were not
matched by explicit components, or included in the ignore list. If this component is not
specified, an ignore list is not needed since all non-specified components will be

If “nocomponent” is NOT specified, then the component name will be output as it appears in
the format file.

The default format file is:

; mhl.format
; default message filter for `show'

The variable “formatfield” specifies a format string (see mh-format(5)). The flag
variables “addrfield” and “datefield” (which are mutually exclusive), tell mhl to
interpret the escapes in the format string as either addresses or dates, respectively.

By default, mhl does not apply any formatting string to fields containing address or dates
(see mh-mail(5) for a list of these fields). Note that this results in faster operation
since mhl must parse both addresses and dates in order to apply a format string to them.
If desired, mhl can be given a default format string for either address or date fields
(but not both). To do this, on a global line specify: either the flag addrfield or
datefield, along with the appropriate formatfield variable string.

The “format” flag specifies that this component will be run through the filter program
specified by the formatproc profile entry. This filter program is expected to read data
on standard input and output data on standard output. Currently the “format” flag is only
supported for the “body” component. The component name will be prefixed to the output
after the filter has been run. The expected use of this is to filter a message body to
create more pleasing text to use in a reply message. A suggested filter to use for
repl(1) is as follows:


The -fmtproc and -nofmtproc switches can be used to override the formatproc profile entry.

The formatarg option specifies a string that is used as an argument to the format filter.
This string is processed by mh-format(5) and all of the message components are available
for use. Multiple formatarg options can be used to build up multiple arguments to the
format filter.

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