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Posted to user@karaf.apache.org by Mike Hummel <mh...@mhus.de> on 2020/02/14 07:29:31 UTC

Re: How to read single character from a Karaf's command

Hi,

you could try

((LineReaderImpl) session.get(".reader")).readCharacter()

Best regards,
Mike

> On 21. Jan 2020, at 17:40, Alex Soto <al...@envieta.com> wrote:
> 
> Hello,
> 
> I am trying to to write a Karaf Command that can pause its output until the user presses any key, or ‘q’, similar to how Linux `more` command does.   So far I have been able to prompt for user input using org.apache.karaf.shell.api.console.Session.readLine,  but this requires the user to press the Enter key.  I want the user to press the space bar or key `q` (for quit) without having to press the Enter key.
> 
> Any hints or pointers on how to accomplish this?
> 
> 
> Best regards,
> Alex soto
> 
> 
> 
>

Re: How to read single character from a Karaf's command

Posted by Mike Hummel <mh...@mhus.de>.

Hi, sorry for delay...

the source is here https://github.com/mhus/mhus-osgi-tools/blob/master/mhu-osgi-api/src/main/java/de/mhus/osgi/api/karaf/KarafConsole.java

you can have a look in the pom file of the project for dependencies.

Best Regards, 
Mike


> On 14. Feb 2020, at 15:13, Alex Soto <al...@envieta.com> wrote:
> 
> Thanks Mike, 
> 
> 
> I assume you are referring to this class org.jline.reader.impl.LineReaderImpl from JLine bundle; unfortunately, it is not exported, so I don’t have visibility to use it in my code.  This class implements interface org.jline.reader.LineReader, which is visible, but it does not have a readCharacter method.  How did you overcome this?
> 
> Thanks and best regards,
> Alex soto
> 
> 
> 
> 
>> On Feb 14, 2020, at 2:29 AM, Mike Hummel <mh@mhus.de <ma...@mhus.de>> wrote:
>> 
>> Hi,
>> 
>> you could try
>> 
>> ((LineReaderImpl) session.get(".reader")).readCharacter()
>> 
>> Best regards,
>> Mike
>> 
>>> On 21. Jan 2020, at 17:40, Alex Soto <alex.soto@envieta.com <ma...@envieta.com>> wrote:
>>> 
>>> Hello,
>>> 
>>> I am trying to to write a Karaf Command that can pause its output until the user presses any key, or ‘q’, similar to how Linux `more` command does.   So far I have been able to prompt for user input using org.apache.karaf.shell.api.console.Session.readLine,  but this requires the user to press the Enter key.  I want the user to press the space bar or key `q` (for quit) without having to press the Enter key.
>>> 
>>> Any hints or pointers on how to accomplish this?
>>> 
>>> 
>>> Best regards,
>>> Alex soto
>>> 
>>> 
>>> 
>>> 
>> 
>

Re: How to read single character from a Karaf's command

Posted by Alex Soto <al...@envieta.com>.

Thanks Mike, 


I assume you are referring to this class org.jline.reader.impl.LineReaderImpl from JLine bundle; unfortunately, it is not exported, so I don’t have visibility to use it in my code.  This class implements interface org.jline.reader.LineReader, which is visible, but it does not have a readCharacter method.  How did you overcome this?

Thanks and best regards,
Alex soto




> On Feb 14, 2020, at 2:29 AM, Mike Hummel <mh...@mhus.de> wrote:
> 
> Hi,
> 
> you could try
> 
> ((LineReaderImpl) session.get(".reader")).readCharacter()
> 
> Best regards,
> Mike
> 
>> On 21. Jan 2020, at 17:40, Alex Soto <alex.soto@envieta.com <ma...@envieta.com>> wrote:
>> 
>> Hello,
>> 
>> I am trying to to write a Karaf Command that can pause its output until the user presses any key, or ‘q’, similar to how Linux `more` command does.   So far I have been able to prompt for user input using org.apache.karaf.shell.api.console.Session.readLine,  but this requires the user to press the Enter key.  I want the user to press the space bar or key `q` (for quit) without having to press the Enter key.
>> 
>> Any hints or pointers on how to accomplish this?
>> 
>> 
>> Best regards,
>> Alex soto
>> 
>> 
>> 
>> 
>