Re: [bug-ncurses] ANN: ncurses-6.4-20240120

[Thomas Dickey]

On Mon, Jan 22, 2024 at 10:30:47AM +0100, Dr. Werner Fink wrote:
> On 2024/01/22 04:15:39 -0500, Thomas Dickey wrote:
> > On Mon, Jan 22, 2024 at 09:12:31AM +0100, Dr. Werner Fink wrote:
> > > On 2024/01/20 23:32:02 +0000, Thomas Dickey wrote:
> > > >  misc/terminfo.src                               | 1440 +++++------
> > >   
> > > > 20240120
> > > >         + use ansi+sgrbold, ansi+sgrdim, ansi+sgrso, ansi+sgrul, 
> > > > ansi+tabs
> > > >           ecma+color, ecma+sgr, vt100+4bsd, vt100+pfkeys, vt220+pcedit
> > > >           xterm+256color, xterm+acs, xterm+nopcfkeys, xterm+pcf2 to 
> > > > trim -TD
> > > 
> > > Simple question on (u)rxvt (with TERM=rxvt-unicode): in rxvt-basic the 
> > > arrow
> > > keys are given as
> > > 
> > >   kcub1=\E[D, kcud1=\E[B, kcuf1=\E[C, kcuu1=\E[A, 
> > > 
> > > this agrees with the result on the shell command line
> > > 
> > >  ^[[D^[[A^[[B^[[C
> > > 
> > > but not within an application like vim
> > > 
> > >  ^[OD^[OA^[OB^[OC
> > 
> > perhaps this -
> > 
> > vim uses smkx/rmkx,
> > 
> >     rmkx=\E>, 
> >     smkx=\E=, 
> > 
> 
> Also less does this :)
> An strace log ( strace -s 1024 -e write -o log vim)
> shows:
> 
>  grep -E '\\33(=|>)' log 
>  write(1, "\33[?1049h\33[?1h\33=\33[?2004h\33[?1004h", 31) = 31
>  write(1, "\33[24;1H\33[K\33[24;1H\33[?1004l\33[?2004l\33[?1l\33>", 40) = 40
> 
> 
> > but not is1/rs1
> > 
> > infocmp rxvt-basic rxvt-unicode
> >     is1: '\E[?47l\E=\E[?1l', '\E[!p'.
> >     rs1: '\E>\E[1;3;4;5;6l\E[?7h\E[m\E[r\E[2J\E[H', '\Ec'.
> > 
> > but \E= sets application mode
> > 
> >     ESC =     Application Keypad (DECKPAM).
> >     ESC >     Normal Keypad (DECKPNM), VT100.
> 
> infocmp rxvt-basic rxvt-unicode | grep -E '(s1|kx):'
>         is1: '\E[?47l\E=\E[?1l', '\E[!p'.
>         rmkx: '\E>', '\E[?1l\E>'.
>         rs1: '\E>\E[1;3;4;5;6l\E[?7h\E[m\E[r\E[2J\E[H', '\Ec'.
>         smkx: '\E=', '\E[?1h\E='.

I checked on the command-line using "tput smkx" and before/after, used
"cat -v" (with ^V to make the escape character literal) and see urxvt
using only the normal cursor keys (\E[ rather than the application \EO).

Using strace, I can see that "less" is only getting the normal cursor keys.

        71502 19:47:50 read(3, "\33", 1)        = 1
        71502 19:47:52 read(3, "[", 1)          = 1
        71502 19:47:52 read(3, "B", 1)          = 1
        71502 19:47:52 read(3, "\33", 1)        = 1
        71502 19:47:52 read(3, "[", 1)          = 1
        71502 19:47:52 read(3, "B", 1)          = 1
        71502 19:47:52 read(3, "\33", 1)        = 1
        71502 19:47:53 read(3, "[", 1)          = 1
        71502 19:47:53 read(3, "C", 1)          = 1
        71502 19:47:53 read(3, "\33", 1)        = 1

But vim is different.  strace shows that it is reading application mode.

        71555 19:48:41 read(0, "\26", 4096)     = 1
        71555 19:48:42 read(0, "\33OA", 4096)   = 3
        71555 19:48:46 read(0, "\33", 4096)     = 1
        71555 19:48:48 read(0, "o", 4096)       = 1
        71555 19:48:49 read(0, "\26", 4096)     = 1
        71555 19:48:50 read(0, "\33OD", 4096)   = 3
        71555 19:48:52 read(0, "\r", 4096)      = 1
        71555 19:48:53 read(0, "\26", 4096)     = 1
        71555 19:48:53 read(0, "\33OC", 4096)   = 3
        71555 19:48:54 read(0, "\33", 4096)     = 1

strace shows vim initializing the terminal:

        71555 19:48:35 write(1, 
"\33[?1049h\33[>4;2m\33[?1h\33=\33[?2004h\33[?1004h", 38) = 38

or more readable (unmap):

        \E[?1000h
        \E[?1049h
        \E[>4;2m
        \E[?1h
        \E=
        \E[?2004h
        \E[?1004h
        \E[1;24r
        \E[?12h
        \E[?12l
        \E[22;2t
        \E[22;1t
        \E[27m
        \E[23m
        \E[29m
        \E[m
        \E[H
        \E[2J

but little of that (perhaps none) comes from the terminfo.

In particular, 

        \E[?1h

which (xterm control sequences) shows where the application mode is set
and reset:

CSI ? Pm h
          DEC Private Mode Set (DECSET).
            Ps = 1  -> Application Cursor Keys (DECCKM), VT100.

CSI ? Pm l
          DEC Private Mode Reset (DECRST).
            Ps = 1  -> Normal Cursor Keys (DECCKM), VT100.

Of course, rxvt/urxvt have some differences from xterm, but this happens
to work in vim because these particular VT100-sequences are implemented.
vim's using its compiled-in list of escape sequences:

        /*
         * Builtin xterm with Vim-specific entries.
         */
        static tcap_entry_T builtin_xterm[] = {

in src/term.c, e.g.,

            {(int)KS_KS,        "\033[?1h\033="},
            {(int)KS_KE,        "\033[?1l\033>"},

-- 
Thomas E. Dickey <dickey@invisible-island.net>
https://invisible-island.net

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