Change /clear behaviour. Closes issue #855.

[spiridoncha]

I just change /clear behavior, but it's not configurable. Should I implement some option for /clear, which change behavior or something like that?

[boothj5]

@spiridoncha apologies for the delay in responding, I took a bit of a break after the last release.

I think making it configurable would be a good idea. If you'd like to discuss let me know here.

Thanks,

James,

[spiridoncha]

@boothj5 thank you for your response.
How should I make this behavior configurable?
I see some cases:

1. Create option for profrc in section [ui] with name clear.persist_history and default value is true or something like that.
2. Create alternative /clear command with new behavior and other name.
3. Create argument for current version of /clear with syntax /clear full or similar.

[boothj5]

I think option 1 would be best, but maybe defaulting to false.

Usually when I allow changing existing behaviour with a configuration option I'll default to the original behaviour (clearing history in this case), just so current users get the same behaviour as before.

[boothj5]

A couple of comments:

1. Most config options can be set with commands, in this case perhaps:
   /clear set persist_history on - sets clear.persist_history=true
/clear set persist_history off - sets clear.persist_history=false
   If you have any other ideas, let me know.

2. When the window buffer is full (1000 lines) the /clear command with clear.persist_history=true doesn't clear the screen. I came across the same issue when I briefly looked into clearing the screen, it might require some changes to how the screen is buffered.

[jubalh]

@spiridoncha still interested in working on this?

[jubalh]

I'll merge this and work on it in separate commits.

[jubalh]

@spiridoncha thanks for your contribution!