feat: support collapse a single folder under cursor

[linepi]

When I use api.tree.expand_all to expand a folder, sometimes I need to collapse a single folder rather than all folders(invoke by api.tree.collapse_all). This feature(api.tree.collapse) can be understood as the inverse operation of api.tree.expand_all.

[linepi]

There might be some imperfections in the naming, documentation, and code details. What I am presenting here is just a rough idea. If this pull request idea is accepted, I will continue to work hard to make more reasonable, reliable, and complete revisions.

[evertonse]

When I expand a folder, sometimes I need to collapse a single folder rather than all folders. This can be understood as the inverse operation of expanding.

I think I migh not understand what you mean.
Is this api.node.navigate.parent_close not what you want?

[linepi]

@evertonse No, that is not the same. api.node.navigate.parent_close will close the parent folder of where cursor is. The new feature api.tree.collapse will close folder and all it subfolder recursively.

[evertonse]

@evertonse No, that is not the same. api.node.navigate.parent_close will close the parent folder of where cursor is. The new feature api.tree.collapse will close folder and all it subfolder recursively.

Ah I see now, then there should be api.tree.collapse. Have at it

[linepi]

I update my commit, including the command, doc and explanation. Please review.

[alex-courtis]

Apologies for not seeing this one earlier...

This is great, we should have had this long ago. I'm thinking about a free default keybinding we can use.

We will do this this however:

• It's missing the keep_buffers parameter of collapse_all
• collapse.lua repeats collapse-all.lua taking a node instead of using explorer

Please an optional node parameter to collapse-all.fn so that it may perform both and keep buffers.

[alex-courtis]

Suggested change

	tree.collapse() *nvim-tree-api.tree.collapse()*
	tree.collapse() *nvim-tree-api.tree.collapse()*

spacing

[alex-courtis]

This is great, many thanks for pushing this one.

[linepi]

Please an optional node parameter to collapse-all.fn so that it may perform both and keep buffers.

All right, I've added and option to collapse_all.fn and removed collapse. Now it's only one function. Please review.

[alex-courtis]

On :NvimTreeCollapseKeepBuffers

Error executing Lua callback: ...pi/lua/nvim-tree/actions/tree/modifiers/collapse-all.lua:29: attempt to index local 'opts' (a boolean value)
stack traceback:
        ...pi/lua/nvim-tree/actions/tree/modifiers/collapse-all.lua:29: in function 'collapse_all'
        ...site/pack/packer/start/linepi/lua/nvim-tree/commands.lua:145: in function <...site/pack/packer/start/linepi/lua/nvim-tree/commands.lua:144>

It looks like we're changing API from a boolean to an opts table. We'll need to provide backwards compatibility for legacy arguments, similar to tree.toggle. That's a massive pain in the arse and adds unnecessary complexity.

Alternative: add an API method tree.collapse, leaving tree.collapse_all unchanged. They both then call the one collapse function satisfying point 2 in #2847 (review)

TL;DR point 2 was asking to use a single collapse function rather than a single API.

[alex-courtis]

tree.collapse_all({keep_buffers})          *nvim-tree-api.tree.collapse_all()*
    Collapse the entire tree.

    Parameters: ~
      • {keep_buffers} (boolean) do not collapse nodes with open buffers.

tree.collapse({opts})                          *nvim-tree-api.tree.collapse()*
    Collapse the tree.

    Parameters: ~
      • {opts} (table) optional parameters

    Options: ~
      • {under_cursor} (boolean) only collapse the node under cursor,
                                 default false
      • {keep_buffers} (boolean) do not collapse nodes with open buffers,
                                 default false

This preserves backward compatibility and the API can stay pure, something like:

Api.tree.collapse = wrap(actions.tree.modifiers.collapse_all.collapse)
Api.tree.collapse_all = wrap(actions.tree.modifiers.collapse_all.collapse_all)

collapse_all.fn would be renamed to collapse_all.collapse

collapse_all.collapse_all would then look something like:

---@param keep_buffers boolean
function M.fn(keep_buffers)
  M.collapse({keep_buffers = keep_buffers, under_cursor = false})
end

Finally, rename collapse-all.lua to collapse.lua

[alex-courtis]

Looking good, we are close...

[alex-courtis]

Closing as this PR is stale. Please reopen if you wish to continue this work.