### Features
* select how to generate the list key

#### was
list_key = [cwd [+ git branch]]
* files
* terminals
* tmux

#### is
list_key = [key] + [list_name]

nil = default
false = turn off

listA = {
    listLine({ ... })
    { ... }
    { ... }
    { ... }
}

harpoon.setup({

    settings = {
        jumpToFileLocation: boolean => defaults true
    }

    default = {
        // defaults to json.parse
        encode = function(obj) => string
        decode = function(string) => object
        key = function() ... end
        display = function(listLine) => string
        select = function(listLine) => void
        equals = function(list_line_a, list_line_b) => boolean

        # question mark: what does it take to support custom things in here?
        # potentially subject to change
        add = function() HarpoonListItem
    }

    frecency = {
        ... a file list that is generated by harpoon ...
        ... can be opened via viewer ...
    }

    events = {
        on_change = function(operation, list, value)
    }

    project = {
        //key = vim.loop.cwd
        key = git origin?
    }

    specifics = {
        key = vim.loop.cwd + git_branch
    }

    list_name = {
        key = function() ... end
    }

})

### Functionality
select by index
prev/next
addToBack
addToFront
checking for deleted files?
- perhaps this could be part of the default select operation and use error
select
- default file select should come with options so you can open split/tab as
  well

harpoon.current = "default"
harpoon.current = "listName"

harpoon.set_current(list_name)

### LATER FEATUERS
frecency = later feature likely, but great idea
- https://github.com/agkozak/zsh-z
- https://en.wikipedia.org/wiki/Frecency

// i don't understand this one
harpoon -> qfix : qfix -> harpoon


harpoon.list("notehu") -> HarpoonList
harpoon.list().add()