NetBSD/usr.bin/vi/docs/bugs.current

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List of known bugs:
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+ The number option doesn't display line numbers in ex append/insert
mode.
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+ The option sidescroll is completely wrong, and setting it does more
harm than good.
+ When nvi edits files that don't have trailing newlines, it appends
one, regardless.
+ Open mode is not yet implemented.
+ ^C isn't passed to the shell in the script windows as an interrupt
character.
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+ The options:
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hardtabs, lisp, optimize, redraw, slowopen
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are recognized, but not implemented. These options are unlikely to
be implemented, so if you want them you might want to say something!
I will implement lisp if anyone ever documents how it worked.
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+ Screen repainting over slow lines, for some screen changes, isn't
as good as the historic vi's.
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+ The line movement commands ('k', 'j' are easy examples) don't find the
most attractive cursor position correctly when wrapped lines are longer
than 80 characters, and they're on the second or subsequent lines.
+ Colon commands longer than a single line cause the display to be
incorrect.
+ The usages of S_{REDRAW,REFORMAT,REFRESH,RENUMBER,RESIZE} are
inconsistent, and should be reviewed. In particular, S_REFRESH
in any screen redraws all screens.
+ Historic vi permitted :g/xxx/vi, i.e. you could execute ex/vi as
global commands. Need to review all of the old commands to verify
which ones could/could not be used as global commands.
+ If you run out of space in the recovery directory, the recovery
file is left in place.