:write_output & :clear_output, --verb_output

[Canop]

Fix: #825

Add a --verb-output launch argument which takes a path to a file (which will be created if necessary)

Add a :write_output internal which allows adding a line to that file. No escaping is done (contrary to what happens with --outcmd).

Add a :clear_output internal which clears the file.

Here are 2 examples of verbs:

    {
        invocation: "wc {cmd}"
        execution: ":write_output wc:{cmd} {file-stem}.bro"
    }

    {
        key: alt-w
        cmd: ":clear_output;:write_output {directory};:quit"
    }

The first one is called with an input like :wc hop which appends to the output a line like wc:hop main.bro.

The second one makes the content of the output file the directory closest to the selection then quits. It could for example be used for a new version of the br shell function.

Note: Semantics isn't pretty. If you have a better idea than "output", please tell me.

[AndydeCleyre]

Thanks so much!

In my first tests, this seems almost working right, but for some reason the following verb does not quit broot. If I call the verb then manually quit it does seem to work as intended though.

  {
    key: alt-enter
    invocation: cd
    internal: ":write_output {directory}"
    leave_broot: true
  }

[Canop]

Today, internals don't even check the leave_broot setting of the verb. For most of them, quitting would be totally unexpected (think for example about "line_down", or "open_preview").

That's why my example in the PR description had an explicit :quit.

Maybe some internals could check it ?

[AndydeCleyre]

I've been using :print_path with leave_broot: true, but I guess leaving broot is part of that internal's behavior anyway? Haven't tried it with false...

OK yeah I'll make it a cmd with quit, thanks!

[AndydeCleyre]

Maybe an interesting quoting issue?

  {
    key: alt-enter
    invocation: cd
    cmd: ":write_output {directory};:quit"
  }

No verb matches "quit\""

[Canop]

This works for me

[AndydeCleyre]

Oh, I tried to use it on a folder named

with " a quote and spaces

[AndydeCleyre]

Also happens with a folder named just sp ac

[Canop]

Ok... I suspected there was a bug in sequence interpolation... back to draft mode!

[Canop]

@AndydeCleyre back to testable

[AndydeCleyre]

This seems to be working great with my weird folder names, thanks!

[Canop]

Thanks @AndydeCleyre for the review