Hayaki Saito wrote:
> Hi, lists
>
> I'm recognizing that some people reported "echo-backing problem"(see below)
> at start-up time on some UNIX terminals.
>
> https://cloud.githubusercontent.com/assets/1162739/6369447/d0fba520-bd29-11e4-9e9f-49b850953db3.png
> related issue: https://github.com/saitoha/mouseterm-plus/issues/3
>
> This is easily reproduced by the following command on XTerm:
>
> $ vim -u NONE --noplugin -c "set nocompatible | autocmd VimEnter * call
> system('sleep 3')"
>
> or
>
> $ vim -u NONE --noplugin -c "set nocompatible | autocmd Termresponse *
> call system('sleep 3')"
>
> I discussed about it with Yukihiro Nakadaira, then propose the following
> solution for this problem:
>
> - VIM should use new terminal mode "cbreak"(fig.2) during calling
> system() function on UNIX terminals.
> - The vim function system() should always be done in non-echo mode
> without prepending ":silent", at least on UNIX terminals.
> - To keep the program simply, drop "sleep" mode and replace it with
> "cbreak" mode.
>
>
> Now VIM uses 3 terminal modes "raw"(TMODE_RAW), "cooked"(TMODE_COOK), and
> "sleep"(TMODE_SLEEP) on UNIX terminals(fig.1).
>
> As same as almost other TUI applications, VIM works with "raw" terminal mode
> basically.
> But in the following cases, VIM switches the terminal to "cooked" mode
> exceptionally.
>
> case 1. when entering shell with ":shell" command
> case 2. during running other processes by such as system() function
> (required for stopping the child process with <C-c>)
>
> I think it is appropriate to use "cooked" mode in case 1.
> But in case 2, "cooked" mode sometimes causes "echo-backing problem" with
> coming into contact with "termresponse" feature.
>
> Another mode "sleep"(TMODE_SLEEP) is used in ":sleep" command and the
> internal function mch_delay().
>
> Attached patch drops "sleep" mode and introduce new terminal mode
> "cbreak"(fig.2).
> I found "sleep" mode in current VIM can be replaced with "cbreak" mode.
> Additionaly this patch uses "cbreak" mode instead of "cooked" mode in
> system() function.
>
> I tested it in OSX10.10 and Linux(Debian sid/CentOS 6.5).
>
> Note:
> With this patch, the default behavior of system() is slightly changed.
> It comes to be same as the behavior of one always prefixed with ":silent".
> But I believe it is no needs to run system() with non-silent(echo on) mode.
> Remind that stdin/stdout of the process launched by system() is always
> redirected.
>
>
> fig.1 existing Vim terminal modes
>
> | get input immediately? | signal with ^C | input echo-backing
> --------+------------------------+----------------+--------------------
> raw | yes | no | no
> --------+------------------------+----------------+--------------------
> cooked | no | yes | yes
> --------+------------------------+----------------+--------------------
> sleep | no | yes | no
> --------+------------------------+----------------+--------------------
>
> fig.2 new terminal mode "cbreak"
>
> | get input immediately? | signal with ^C | input echo-backing
> --------+------------------------+----------------+-------------------
> cbreak | yes | yes | no
> --------+------------------------+----------------+-------------------
Thanks for looking into this. I wonder if there is any situation where
this change would cause problems. Can a few people, especially those
with plugins that use system(), try this out?
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