Re: TerminalView position and text of prompt

[Brian G <brian@xxxxxxxxxxxxxxxx>]

On 4/23/24 08:25, Bruce Steers wrote:
> On Tue, 23 Apr 2024 at 00:41, Brian G <brian@xxxxxxxxxxxxxxxx> wrote:
>
>
>     On 4/20/24 07:19, Bruce Steers wrote:
> >     It seems that line gets all the PS1 string
> >     though
> >
> >     My PS1 is this..
> >     '\[\e]0;\u:
> >     \W\a\]\[\033[01;96m\]\u\[\033[00m\]:\[\033[01;92m\]\W\[\033
> >
> >     between the \e]0; and the \a\] is the part that is read to set
> >     the title.
> >
> >     The "title getting" code uses this PS1 string,
> >     if i change my PS1 to say '\u \w : ' then the PS1 does not have
> >     the \e]0; and the terminal will not fire a Title change anymore
> >     as it requires this syntax.
> >
> >     That PS1 variable is the exact string that sData in the OutputTo
> >     method reads.
> >     So i reckon it could be considered as much as a solid standard as
> >     the title change is.
> >
> >     It's a darn shame there is no reasonable / reliable method :(
> >
> >     Respects
> >     BruceS :)
> >
> >
> >     On Sat, 20 Apr 2024 at 06:55, Benoît Minisini
> >     <benoit.minisini@xxxxxxxxxxxxxxxx> wrote:
> >
> >         Le 20/04/2024 à 04:58, Bruce Steers a écrit :
> >         >
> >         > I may have found an answer already in the code...
> >         >
> >         https://gitlab.com/gambas/gambas/-/blob/master/comp/src/gb.form.terminal/.src/TerminalView/TerminalFilter_VT100.class?ref_type=heads#L158
> >         <https://gitlab.com/gambas/gambas/-/blob/master/comp/src/gb.form.terminal/.src/TerminalView/TerminalFilter_VT100.class?ref_type=heads#L158>
> >         >
> >         > it does this.....
> >         >
> >         > If sCmd = "0" Or If sCmd = "2" Then
> >         > hView.Title = sTitle
> >         >
> >         > sData at that point has the path to the left of iPos2 that
> >         is used to
> >         > set the title and it seems to have the prompt to the right
> >         >
> >         > If sCmd = "0" Or If sCmd = "2" Then
> >         > hView.Title = sTitle
> >         >    hView.Prompt = Mid$(sData, iPos2 + 1)
> >         >
> >         >
> >         > I wish there was an easily way to remove escape sequences
> >         and convert it
> >         > to plain text
> >         >
> >         > All i found was a sed command
> >         >
> >         > Private Sub Prompt_Write(Value As String)
> >         >
> >         >    Shell "echo -n '" & Value & "'| sed -r
> >         > \"s/\x1B\\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g\"" To $sPrompt
> >         >
> >         > End
> >         >
> >         >
> >         > Respects
> >         > BruceS
> >         >
> >
> >         This code manages the command for setting the terminal
> >         emulator window
> >         title. It is an XTerm specific command that became implicit
> >         standard.
> >
> >         Nothing says that the window title will include the prompt.
> >
> >         Regards,
> >
> >         -- 
> >         Benoît Minisini.
>     I am not sure if this helps, but there is a filter hook in the
>     terminal that allows to monitor what is written to the terminal.
>     Would it be possible to monitor that for the last output, or an expected prompt?
>
> The problem is the prompt cannot really be "expected" to be anything 
> as any user or script can change it with the PS1 variable.
>
> The only way i can see to reliably get the bash prompt is to use this 
> command..
> echo ${PS1@P}
>
> I tried using something like this...
> TerminalView1.AlternateScreen = True
> TerminalView1.Input(" echo ${PS1@P} > /tmp/tvresult\n")
> TerminalView1.AlternateScreen = False
> While Not Exist("/tmp/tvresult")
>   Wait 0.1
> Wend
> Dim sResult as String = Trim(File.Load("/tmp/tvresult"))
>
> it just then needs the escape sequences removed.
> But it's ugly as the terminal flickers to the other screen, it'd be 
> nice to be able to use the AlternateScreen invisibly.
>
> currently i'm just using the same method the Title event uses.
> VT100 monitors output for a string in the PS1 that has the title, but 
> i discovered also has the prompt string.
> but if the user or the script changes the PS1 to a non standard format 
> it will not work.
>
> the echo ${PS1@P} seems the best way.
>
> Respects
> BruceS
Bruce, if you monitor the keyboard input, and the output stream, if 
there is a key press of a displayable character to the screen, after a 
write of data to the terminal. you will probably acquire the prompt 
position/data. if you keep a history of lines written then the last 
write of data should be the  prompt. This is possible with the terminal 
currently.

--
~~~~ Brian

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