feat: add `workspace_directory` and `current_working_directory` variable expansions

[nik-rev]

Use case: Recently Yazi added out-of-the-box support for usage inside of Helix with with command:

[keys.normal]
space.E = [
  ':sh rm -f /tmp/unique-file',
  ':insert-output yazi %{buffer_name} --chooser-file=/tmp/unique-file',
  ':insert-output echo "\x1b[?1049h" > /dev/tty',
  ':open %sh{cat /tmp/unique-file}',
  ':redraw',
]

This replaces file_explorer_in_current_buffer_directory for me with a Yazi picker

I would like to be able to replace these two commands with Yazi as well:

• file_explorer (uses workspace root)
• file_explorer_in_current_directory (cwd)

This PR allows for that. Now you can do this too:

# file_explorer
space.e = [
  ':sh rm -f /tmp/unique-file2',
  ':insert-output yazi %{workspace_directory} --chooser-file=/tmp/unique-file2',
  ':insert-output echo "\x1b[?1049h" > /dev/tty',
  ':open %sh{cat /tmp/unique-file2}',
  ':redraw',
]
# file_explorer_in_current_working_dir
space.X = [
  ':sh rm -f /tmp/unique-file3',
  ':insert-output yazi %{workspace_directory} --chooser-file=/tmp/unique-file3',
  ':insert-output echo "\x1b[?1049h" > /dev/tty',
  ':open %sh{cat /tmp/unique-file3}',
  ':redraw',
]

[pandalec]

Regarding the recipe site this is already included.

[the-mikedavis]

I would consider that a bug in the wiki. The wiki should not suggest things that aren't merged yet.

[nik-rev]

I would consider that a bug in the wiki. The wiki should not suggest things that aren't merged yet.

Fixed by removing from the wiki

[willbush]

I would consider that a bug in the wiki. The wiki should not suggest things that aren't merged yet.

Fixed by removing from the wiki

@nik-rev Now this is merged should it be added back or wait till it's in a release?

Also wonder if your space.e example above had a typo in it using %{buffer_name}(from your config) makes more sense to me because it takes you to the current buffer directory and highlights the file you're in.

Other random suggestion:

":open %sh{cat /tmp/unique-file-u41ae14 | head -n1}",

If you mark multiple files with yazi and press enter, :open won't be able to handle it. The above just uses the first one. Perhaps it could do something more clever to actually handle opening multiple buffers at once