[Harpoon 2] Feature Request: Load all buffers in scope into harpoon

[sreedevk]

What issue are you having that you need harpoon to solve?
Scenario: The user starts working on a project & has a few buffers open. The user then realizes that they need to add all these open files to harpoon. The user needs to manually navigate to each buffer & add it to harpoon manually.

Why doesn't the current config help?
My initial investigation did not show me a way to bulk add all current buffers into harpoon.

What proposed api changes are you suggesting?

I have a bare minimum implementation that can be added to lua/harpoon/mark.lua.
I am not familiar with the testing/CI setup for harpoon, so I am adding the code here.
If anybody else is interested in having this feature, feel free to open a proper PR with the following code:

function M.harpoon_buffers()
    for _, buffer_index in ipairs(vim.api.nvim_list_bufs()) do
        local buffer_name = vim.api.nvim_buf_get_name(buffer_number)
        if buffer_name ~= '' then
            M.add_file(buffer_name)
        end
    end
end

Caveats & Additional Suggestions

1. Avoid adding harpoon ui buffers into harpoon
2. The function could accept an optional parameter like "*.lua" to add only buffers holding files of a specific type.