[Feature]: Autosave only when the session file of current working directory exists

[MasouShizuka]

This feature is similar to autosave_only_in_session of the plugin neovim-session-manager.
With this feature, I can autoread the session of only my manually saved working directory.

Although there is currently a setting of should_autosave, I cannot determine through the API whether there is a session of the current working directory in the session directory.
At present, it seems that can only compare each file_path with the current working path through list()
However, the naming of the session file may change with plug-in updates.

Therefore, perhaps an API should be provided to determine whether the session file of the current directory exists?

[MasouShizuka]

Currently, if I want to implement this feature, I must write in config:

local persisted = require("persisted")

local save_dir = vim.fn.expand(variables.data_path .. "/lazy/persisted.nvim/sessions/")
opts["save_dir"] = save_dir
opts["should_autosave"] = function()
    local name = vim.fn.getcwd():gsub(require("persisted.utils").get_dir_pattern(), "%%")
    local session = save_dir .. name .. persisted.get_branch() .. ".vim"
    return vim.fn.filereadable(session) ~= 0
end

persisted.setup(opts)

In order for this to work, it must be consistent with the repository's code.
So I still hope to be able to provide this feature.

EDIT: Oh, I found that SessionSave must meet the conditions of should_autosave, so it cannot be saved in the new working directory. It can only update existing session files.

[olimorris]

@MasouShizuka sorry my time is quite constrained these days. I'd be willing to accept a PR if you wish to add any functionality that solves this.