MHL(1MH) COMMAND REFERENCE MHL(1MH) NAME mhl - produce formatted listings of MH messages SYNOPSIS mhl [ -clear] [-noclear] [-folder folder] [-form formfile] [-length length] [-width width] [-help] [ filename... ] DESCRIPTION Mhl is a formatted message listing program. It can be used as a replacement for more(1) (the default message lister). The default lister can be changed by placing a "showproc: /bin/mhl" in your ".mh_profile". As with more(1), each of the messages specified as arguments (or stdin) 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> suppressing the screen clear. An <interrupt> will abort the current message ouput, prompting for the next message (if there is one), and a <quit> will terminate the program (without core dump). As in all MH programs, mhl looks for a line mhl: args in the user's profile, and thus allows tailored defaults. The switches are: -clear Clear screen each page -noclear Don't clear screen each page -folderfolder Use this "folder" name -formformfile Name of the format file -lengthlength Screen length -widthwidth Screen width -help Standard help message All of the functions these switches perform are affected or controlled by information elsewhere. That is, the format file can specify "clear", in which case, the command line switches will override. Also, the length and width can be specified in the format file, or default to 40x80. The folder is used in constructing a message name (see special component "MessageName" below). If it is not specified in a switch, it is taken from the environment variable mhfolder, which show, next, prev, and pick initialize appropriately. Printed 5/12/88 1
MHL(1MH) COMMAND REFERENCE MHL(1MH) If the form file is not specified, it is taken from the file mhl.format in the user's MH directory; if that file doesn't exist, it is taken from /usr/lib/mh/mhl.format. (Same evaluation hierarchy as the compose form file.) 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 mhl.format file contains information controlling screen clearing, screen size, wraparound 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 mhl.format has one of the formats: ;comment :cleartext variable[,variable...] component:[variable,...] 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, and finally, remaining lines define the global environment. For example, the line: width=80,length=40,clearscreen,overflowtext=***,overflowoffset=5 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 effect is global. Since the whole format is parsed before any output processing, the last global switch setting for a variable applies to the Printed 5/12/88 2
MHL(1MH) COMMAND REFERENCE MHL(1MH) whole message. width=# Screen width, component width overflowtext=t Text to use at the beginning of an overflow line overflowoffset=# Positions to indent overflow lines compwidth=# Positions to indent component text after first line nocomponent Don't output "component: " for this component uppercase Output text of this component in all upper case center Center component on line (works for one- line components only) clearscreen Clear the screen (form feed) prior to each page leftadjust Strip off leading spaces & tabs on each line of text compress Change newlines in text to spaces Where "=#" indicates a number must be specified, and "=t" indicates that arbitrary text up to end of line or "," is required. The variables without arguments are ON indicators, with the default in all cases OFF. The variables "nocomponent", center, leftadjust and compress have no affect globally, and clearscreen only affects the global environment. A line of the form: ignores=component,... specifies a list of components which are never output. The component "MessageName" (case is unimportant) will output the actual message name ( filename ) preceded by folder: if one is specified or found in the environment. The component "Extras" will output all of the components of the message which were not matched by explicit components, Printed 5/12/88 3
MHL(1MH) COMMAND REFERENCE MHL(1MH) 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 ignored. If "nocomponent" is NOT specified, then the component name will be output as it appears in the format file. The current default format is: width=80,length=40,overflowtext=***,overflowoffset=5 ignores=msgid,message-id Date:leftadjust,offset=40 To:leftadjust Cc:leftadjust : From:leftadjust Subject:leftadjust : extras:leftadjust,nocomponent : body:nocomponent OPTIONS -clear Clear the screen for each page. -folder folder Use this "folder" name. -form formfile Name of the format file. -help Standard help message. -length length Set screen length. -noclear Don't clear the screen for each page. -width width Set screen width. SEE ALSO inc(1mh), more(1), next(1mh), prev(1mh), show(1mh), and mh_profile(5mh). Printed 5/12/88 4
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