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mhl(1mh)							      mhl(1mh)

Name
       mhl - produce formatted listings of MH messages

Syntax
       mhl [ options ] [ files...  ]

Description
       The  command  is a program for listing formatted messages, which can be
       used as a replacement for the default program.

       As with each of the messages specified as arguments  (or	 the  standard
       input) are output.  If more than one message file is specified, you are
       prompted prior to each one, and a <RETURN> or <EOT> begins the  output.
       <RETURN>	 clears	 the  screen  (if  appropriate),  and  <EOT>,  usually
       <CTRL/D>,  suppresses  the  screen  clear.   An	<INTERRUPT>,   usually
       <CTRL/C>,  aborts  the  current	message output, prompting for the next
       message, if there is one.  A <QUIT>, usually <CTRL/E>,  terminates  the
       program without generating a core dump.

       The  command  operates  in  two	phases: it reads and parses the format
       file; then it processes each message (file).  During the	 first	phase,
       an internal description of the format is produced as a structured list.
       In the second phase, this list is traversed for each message, and  mes‐
       sage  information  is output according to the instructions contained in
       the format file.

   The Form File mhl.format
       The form file contains information controlling screen clearing,	screen
       size,  wrap-around  control,  transparent text, component ordering, and
       component formatting.  A list of components that should be ignored  may
       also  be	 specified, and some special components are defined to provide
       added functionality.  Message output is in the order specified  by  the
       order in the format file.

       Each line of the file has one of the following formats:
	    ;comment
	    :cleartext
	    variable[variable...]
	    component:[variable...]
       A line beginning with a semi colon (;) is a comment, and is ignored.  A
       line beginning with a colon (:) is clear text, and is output exactly as
       it is.  A line containing only a colon (:) 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.
       Examples of these are given below, together  with  the  system  default
       form file.

       If  variables  or arguments follow a component, they apply only to that
       component; otherwise, their effect 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, provided that the variable
       is used in a global context (bell, clearscreen, width, length).	All of
       the current variables and their arguments are shown  in	the  following
       table:

       ──────────────────────────────────────────────────────────────────
       Variable		Type	   Semantics
       ──────────────────────────────────────────────────────────────────
       width		integer	   screen width or component width
       length		integer	   screen length or component length
       offset		integer	   positions to indent the 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	   do not use uppercase
       clearscreen	flag/G	   clear the screen prior to each page
       noclearscreen	flag/G	   do not clear the screen
       bell		flag/G	   ring the bell at the end of each page
       nobell		flag/G	   disable bell
       component	string/L   name to use instead of component for
				   this component
       nocomponent	flag	   do not output component: for this
				   component
       center		flag	   center component on line (works for
				   one-line components only)
       nocenter		flag	   do not center
       leftadjust	flag	   strip off leading white-space on each
				   line of text
       noleftadjust	flag	   do not leftadjust
       compress		flag	   change newlines in text to spaces
       nocompress	flag	   do not compress
       formatfield	string	   format string for this component
       addrfield	flag	   field contains addresses
       datefield	flag	   field contains dates
       ──────────────────────────────────────────────────────────────────

       To  specify  the	 value	of integer-valued and string-valued variables,
       follow their name with an equals-sign (=) and the value.	  Integer-val‐
       ued  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:
	   ignores=component,...
       specifies a list of components which are never output.

       The component MessageName outputs the actual message name  (file	 name)
       preceded	 by  the folder name if one is specified or found in the envi‐
       ronment.	 The format is identical  to  that  produced  by  the  -header
       option to

       The component Extras outputs 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 are ignored.

       If -nocomponent is not specified, then the component name is output  as
       it appears in the format file.

       The  variable  formatfield specifies a format string; see The variables
       addrfield and datefield, which  are  mutually  exclusive,  control  the
       interpretation of the escapes.

       By  default,  does not apply any formatting string to fields containing
       address or dates; see for a list of  these  fields.   This  results  in
       faster  operation since must parse both addresses and dates in order to
       apply a format string to them.  If desired, can be given a default for‐
       mat  string  for	 either	 address  or date fields, but not both.	 To do
       this, on a global line specify either the  variable  addrfield  or  the
       variable datefield, along with the variable formatfield.

Options
       -bell
       -nobell	 Tells	to  ring  the  terminal	 bell at the end of each page.
		 This is the default behavior.	You can suppress this by using
		 the -nobell option.

		 This option takes effect only if the profile entry is defined
		 but empty, and if is outputting to a terminal.	 If the	 entry
		 is  defined  and  non-empty, and is outputting to a terminal,
		 then causes the to be placed between the terminal and and the
		 switches are ignored.

       -clear
       -noclear	 Tells	to clear the screen at the end of each page, or output
		 a formfeed after each message.	  You  can  suppress  this  by
		 using the -noclear option.  The default behavior is -noclear.

		 This option takes effect only if the profile entry is defined
		 but empty, and if is outputting to a terminal.	 If the	 entry
		 in  the user's is defined and non-empty, and is outputting to
		 a terminal, then causes the program to be placed between  the
		 terminal and and the options are ignored.

		 If the -clear option is used and the output of is directed to
		 a terminal, then consults the $TERM and $TERMCAP  environment
		 variables  to	determine  your terminal type in order to find
		 out how to clear the screen.  If the -clear  switch  is  used
		 and  the  output  of  is  not directed to a terminal (if, for
		 example, it is directed to a pipe or a file),	then  sends  a
		 formfeed after each message.

       -folder +foldername
		 Sets the folder name.	This is used by components in the form
		 file to output the message name.  If  you  do	not  use  this
		 option, consults the environmental variable $mhfolder.

       -form formfile
		 Specifies the format file used.  If this option is not given,
		 searches in your Mail directory for a file called or, if this
		 file does not exist, it uses the system default file

       -help	 Prints a list of the valid options to this command.

       -length lines
		 Sets the screen length.  This defaults to the value indicated
		 by if appropriate; otherwise, it defaults to 40.

       -width columns
		 Sets the screen width.	 This defaults to the value  indicated
		 by if appropriate; otherwise, it defaults to 80.

       -moreproc program
       -nomoreproc
		 Overrides  the	 default program.  Note that never starts a if
		 invoked on a hardcopy terminal.

       The defaults for this command are:

	      -bell
	      -noclear
	      -length 40
	      -width 80

Examples
       The first example gives a typical line of a form file:
       width=80,length=40,clearscreen,overflowtext="***",overflowoffset=5
       The first two elements define the screen width to be 80 characters, and
       the screen length to be 40 lines.  The next element, clearscreen, spec‐
       ifies that the screen should be cleared prior to each page.   The  next
       element, overflowoffset=5, states that that the overflow indentation is
       5.  The final element, overflowtext="***", specifies that overflow text
       should be flagged with three asterisks.

       The system default form file, is:
       : -- using template mhl.format - -
       overflowtext="***",overflowoffset=5
       leftadjust,compwidth=9
       ignores=msid,msgid,message-id,received
       Date:formatfield="%<(nodate{text})%{text}%|%(pretty{text})%>"
       To:
       cc:
       :
       From:
       Subject:
       :
       extras:nocomponent
       :
       body:nocomponent,overflowtext=,overflowoffset=0,noleftadjust

Profile Components
       Path:	   To determine your Mail directory
       moreproc:   Program to use as interactive front-end

Files
       The system default form file, used to format message.

       The user-supplied alternate to the system default form file.

       The user profile.

See Also
       more(1), show(1mh), mh_profile(5mh), ap(8mh), dp(8mh)

								      mhl(1mh)
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