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'nethack --usage' and '?' menu

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Write up a description of how the command line works on UNIX and put
that in new file dat/usagehlp.  Add support for
|nethack --usage | --help | -? | ?
to display it and exit.

Also add a menu entry for nethack's help command to show it during
play.  That can be suppressed by uncommenting new '#define HIDE_USAGE'
in config.h since it won't be useful on servers that don't give
players access to command lines.

New genl_display_file() just writes to stdout.  opt_usage(), which
calls it, might need some suid/sgid handling to make sure the output
is done as the player rather than as nethack.

doc/nethack.6 is already out of date again.
This commit is contained in:
PatR
2022-11-18 16:07:15 -08:00
parent 75eaf59354
commit 9a7f8418ee
9 changed files with 262 additions and 37 deletions
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sys/unix/Makefile.top
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@@ -91,7 +91,7 @@ LUA_VERSION = 5.4.4
# end of configuration
#
DATHELP = help hh cmdhelp keyhelp history opthelp optmenu wizhelp
DATHELP = help hh cmdhelp keyhelp history opthelp optmenu usagehlp wizhelp
SPEC_LEVS = asmodeus.lua baalz.lua bigrm-*.lua castle.lua fakewiz?.lua \
juiblex.lua knox.lua medusa-?.lua minend-?.lua minefill.lua \