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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doc/nethack.6 is already out of date again.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.src
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@@ -1191,7 +1191,7 @@ $(TARGETPFX)vision.o: vision.c $(HACK_H)
$(TARGETPFX)weapon.o: weapon.c $(HACK_H)
$(TARGETPFX)were.o: were.c $(HACK_H)
$(TARGETPFX)wield.o: wield.c $(HACK_H)
$(TARGETPFX)windows.o: windows.c $(HACK_H) ../include/wintty.h
$(TARGETPFX)windows.o: windows.c $(HACK_H) ../include/dlb.h ../include/wintty.h
$(TARGETPFX)wizard.o: wizard.c $(HACK_H)
$(TARGETPFX)worm.o: worm.c $(HACK_H)
$(TARGETPFX)worn.o: worn.c $(HACK_H)