Fix help command on macOS Ventura to use mandoc -a

[crowedavid]

If interested, I updated encpass_help_prog() to work on macOS Ventura (probably earlier too) with the following:

• "man -l" error output uses "illegal" instead of "invalid"
• to use "mandoc -a" instead of the tbl+groff+less pipeline since macOS doesn't include tbl+groff

[ahnick]

Hey David, Thanks for submitting the PR! Had I realized mandoc existed I would have used that earlier. :-)

I tested on my local with mandoc and it worked; however, I'm on Monterey (version 12.1) and it still says "invalid" in the error message if you try to use man with the -l option. See the output below.

$ man -l
man: invalid option -- l
man, version 1.6g

usage: man [-adfhktwW] [section] [-M path] [-P pager] [-S list]
	[-m system] [-p string] name ...

  a : find all matching entries
  c : do not use cat file
  d : print gobs of debugging information
  D : as for -d, but also display the pages
  f : same as whatis(1)
  h : print this help message
  k : same as apropos(1)
  K : search for a string in all pages
  t : use troff to format pages for printing
  w : print location of man page(s) that would be displayed
      (if no name given: print directories that would be searched)
  W : as for -w, but display filenames only

  C file   : use `file' as configuration file
  M path   : set search path for manual pages to `path'
  P pager  : use program `pager' to display pages
  S list   : colon separated section list
  m system : search for alternate system's man pages
  p string : string tells which preprocessors to run
               e - [n]eqn(1)   p - pic(1)    t - tbl(1)
               g - grap(1)     r - refer(1)  v - vgrind(1)
$ sw_vers
ProductName:	macOS
ProductVersion:	12.1
BuildVersion:	21C52

What is the exact output you see when you run "man -l" on your local? Is it the same as mine except the message now has "illegal" where mine says "invalid" now?

If so, then I can probably just add an OR condition to make it work for older versions of macOS as well.

Thanks!

[crowedavid]

similar output but more truncated on Ventura:

$ man -l
/usr/bin/man: illegal option -- l
Usage:
 man [-adho] [-t | -w] [-M manpath] [-P pager] [-S mansect]
     [-m arch[:machine]] [-p [eprtv]] [mansect] page [...]
 man -f page [...] -- Emulates whatis(1)
 man -k page [...] -- Emulates apropos(1)
$ sw_vers
ProductName:		macOS
ProductVersion:		13.1
BuildVersion:		22C65

your OR condition should work well.