Commit Graph

2 Commits (da2afe7353066743e30592f03a7a55f24df4dd5c)

Author SHA1 Message Date
Michael Davis da2afe7353 Add '#' and '.' special registers
These come from Kakoune:

* '#' is the selection index register. It's read-only and produces the
  selection index numbers, 1-indexed.
* '.' is the selection contents register. It is also read-only and
  mirrors the contents of the current selections when read.

We switch the iterators returned from Selection's `fragments` and
`slices` methods to ExactSizeIterators because:

* The selection contents register can simply return the fragments
  iterator.
* ExactSizeIterator is already implemented for iterators over Vecs, so
  it's essentially free.
* The `len` method can be useful on its own.
1 year ago
Michael Davis 5eb1a25d8a Refactor Registers to take Editor
This sets up a new Registers type that will allow us to expand support
for special registers. (See the child commits.)

We start simple with the regular (`Vec<String>`) registers and the
simplest special register, the black hole. In the child commits we
will expand these match arms with more special registers.

The upcoming special registers will need a few things that aren't
possible with the current Registers type in helix-core:

* Access to the `Editor`. This is only necessary when reading from
  registers, so the `&Editor` parameter is only added to
  `Registers::read`.
* Returning owned values. Registers in helix-core returns references
  to the values backed by the `Vec<String>` but future special registers
  will need to return owned values. We refactor the return value of the
  read operations to give `Cow<str>`s and iterators over those.
* Returning a `Result` for write/push functions. This will be used by
  the clipboard special registers.
1 year ago