helix-term/commands: implement buffer-close (bc, bclose) (#1035)

* helix-view/view: impl method to remove document from jumps

* helix-view/editor: impl close_document

* helix-view/editor: remove close_buffer argument from `close`

According to archseer, this was never implemented or used properly. Now
that we have a proper "buffer close" function, we can get rid of this.

* helix-term/commands: implement buffer-close (bc, bclose)

This behaves the same as Kakoune's `delete-buffer` / `db` command:

* With 3 files opened by the user with `:o ab`, `:o cd`, and `:o ef`:
  * `buffer-close` once closes `ef` and switches to `cd`
  * `buffer-close` again closes `cd` and switches to `ab`
  * `buffer-close` again closes `ab` and switches to a scratch buffer
* With 3 files opened from the command line with `hx -- ab cd ef`:
  * `buffer-close` once closes `ab` and switches to `cd`
  * `buffer-close` again closes `cd` and switches to `ef`
  * `buffer-close` again closes `ef` and switches to a scratch buffer
* With 1 file opened (`ab`):
  * `buffer-close` once closes `ab` and switches to a scratch buffer
  * `buffer-close` again closes the scratch buffer and switches to a new
    scratch buffer

* helix-term/commands: implement buffer-close! (bclose!, bc!)

Namely, if you have a document open in multiple splits, all the splits
will  be closed at the same time, leaving only splits without that
document focused (or a scratch buffer if they were all focused on that
buffer).

* helix-view/tree: reset focus if Tree is empty

1 files changed, 3 insertions, 0 deletions

diff --git a/helix-view/src/tree.rs b/helix-view/src/tree.rs
index 064334b1..de5046ac 100644
--- a/helix-view/src/tree.rs
+++ b/helix-view/src/tree.rs
@@ -314,6 +314,9 @@ impl Tree {
 
     pub fn recalculate(&mut self) {
         if self.is_empty() {
+            // There are no more views, so the tree should focus itself again.
+            self.focus = self.root;
+
             return;
         }