Provide a way to enter the nil perspective

[russell]

Some buffers end up in the nil perspective, this provides a way to
switch back to the nil perspective using the same mechanism that you
use to leave it.

[russell]

This patch could possibly activate helm-mini on re-entry into the nil perspective? at the moment it just switches back to the perspective.

[bmag]

FYI SPC l 1 switches to the nil perspective, so there is already a way to enter the nil perspective. But another way won't hurt.

[bmag]

Could use (unless ... instead of (when (not ...

[russell]

Thanks, too much python for me i think...

[TheBB]

Doesn't SPC l h switch to the nil perspective also?

[bmag]

It does, somehow I missed it when looking at SPC l ? before...

[russell]

Ah yeah, i didn't find SPC l I think I was too busy looking with desc-bindings. Thanks, for the tip.

[russell]

Ok, after some time to think about it, I believe that this patch could be better.

1. It mixes perspective sources and projectile sources, so that means that when the different source provides different behaviour it's surprising to the user.
2. If there are multiple perspectives, then it doesn't list them.

I have an alternative implementation below that instead of adding the nil perspective to the list, it adds in the spacemacs//helm-perspectives-source below the projectile source. Does this seem more reasonable? I think it would probably provide a better switching experience.

(defun spacemacs/helm-persp-switch-project (arg)
  (interactive "P")
  (helm
   :sources
   `(,(helm-build-in-buffer-source "Switch Project"
     :data (lambda ()
             (if (projectile-project-p)
                 (cons (abbreviate-file-name (projectile-project-root))
                       (projectile-relevant-known-projects))
               projectile-known-projects))
     :fuzzy-match helm-projectile-fuzzy-match
     :mode-line helm-read-file-name-mode-line-string
     :action '(("Switch to Project Perspective" .
                (lambda (project)
                  (let ((persp-reset-windows-on-nil-window-conf t))
                    (persp-switch project)
                    (let ((projectile-completion-system 'helm))
                      (projectile-switch-project-by-name project)))))))
     ,(spacemacs//helm-perspectives-source))
   :buffer "*Helm Projectile Layouts*"))
``

[github-actions]

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