Debian Bug report logs - #913237
xterm: exec-formatted sends an ending bracketed-paste sequence to the application (when enabled)

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Date: Wed, 5 Dec 2018 13:33:41 +0100
From: Vincent Lefevre <[email protected]>
To: [email protected], [email protected]
Subject: Re: Bug#913237: xterm: exec-formatted yields a tilde character in
 zsh and emacs
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On 2018-12-05 11:30:03 +0100, Vincent Lefevre wrote:
> On 2018-12-05 05:03:46 -0500, Thomas Dickey wrote:
> > On Wed, Dec 05, 2018 at 10:13:35AM +0100, Vincent Lefevre wrote:
> > > According to strace, it is xterm:
> > 
> > sure: xterm replies to the application for bracketed paste.
> 
> You mean that it is zsh that does the paste?
> 
> Why isn't there any system call from zsh in the strace output
> (between the Ctrl-Meta-Click and the exec-formatted), then?

[Another test on a different machine...]

If I type 'b' in xterm, the strace shows:

26473 13:22:10.942153 write(4, "b", 1)  = 1
[...]
26473 13:22:10.961746 read(4, "b", 4096) = 1

So, it seems that the "write(4, ...)" corresponds to what xterm sends
to the application (here, zsh), and the "read(4, ...)" corresponds to
what zsh outputs (which is received by xterm): Since I've typed "b" in
xterm, xterm sends "b" to zsh, which handles it by inserting it in its
command line buffer and displaying it.

So, concerning the

26473 13:22:16.545126 write(4, "\33[201~", 6 <unfinished ...>

generated by Meta-Click with

  Meta<Btn1Down>: exec-formatted("/bin/true", PRIMARY)

in the VT100 translations, this is what xterm sends to zsh. So, it is
xterm that is the cause, not zsh.

Note also that for a bracketed paste,

  https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h2-Bracketed-Paste-Mode

says:

  When bracketed paste mode is set, the program will receive:
     ESC [ 2 0 0 ~ ,
  followed by the pasted text, followed by
     ESC [ 2 0 1 ~ .

but here, only "\33[201~" is present in the strace output:

cventin:~> grep '\\33\[20' str.out
26473 13:22:16.545126 write(4, "\33[201~", 6 <unfinished ...>

Thus is cannot correspond to a bracketed paste.

-- 
Vincent Lefèvre <[email protected]> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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