<div align="center">

# Harpoon
##### Getting you where you want with the fewest keystrokes.

[![Lua](https://img.shields.io/badge/Lua-blue.svg?style=for-the-badge&logo=lua)](http://www.lua.org)
[![Neovim](https://img.shields.io/badge/Neovim%200.5+-green.svg?style=for-the-badge&logo=neovim)](https://neovim.io)

<img alt="Harpoon Man" height="280" src="/assets/harpoon-icon.png" />
</div>

## ⇁ TOC
* [The Problems](#-The-Problems)
* [The Solutions](#-The-Solutions)
* [Installation](#-Installation)
* [Getting Started](#-Getting-Started)
* [Social](#-Social)
* [Note to legacy Harpoon 1 users](#-Note-to-legacy-Harpoon-1-users)

## ⇁ The Problems
1. You're working on a codebase. medium, large, tiny, whatever. You find
yourself frequenting a small set of files and you are tired of using a fuzzy finder,
`:bnext` & `:bprev` are getting too repetitive, alternate file doesn't quite cut it, etc etc.
1. You want to execute some project specific commands or have any number of
persistent terminals that can be easily navigated to.

## ⇁ The Solutions
1. The ability to specify, or on the fly, mark and create persisting key strokes
to go to the files you want.
1. Unlimited terminals and navigation.

## ⇁ Installation
* neovim 0.8.0+ required
* install using your favorite plugin manager (i am using `packer` in this case)
```lua
use "nvim-lua/plenary.nvim" -- don't forget to add this one if you don't have it yet!
use {
    "ThePrimeagen/harpoon",
    branch = "harpoon2",
    requires = { {"nvim-lua/plenary.nvim"} }
}
```

## ⇁ Getting Started

### Quick Note
You will want to add your style of remaps and such to your neovim dotfiles with
the shortcuts you like.  My shortcuts are for me.  Me alone.  Which also means
they are designed with dvorak in mind (My layout btw, I use dvorak btw).

### harpoon:setup() IS REQUIRED
it is a requirement to call `harpoon:setup()`.  This is required due to
autocmds setup.

### Basic Setup
Here is my basic setup

```lua
local harpoon = require("harpoon")

-- REQUIRED
harpoon:setup()
-- REQUIRED

vim.keymap.set("n", "<leader>a", function() harpoon:list():append() end)
vim.keymap.set("n", "<C-e>", function() harpoon.ui:toggle_quick_menu(harpoon:list()) end)

vim.keymap.set("n", "<C-h>", function() harpoon:list():select(1) end)
vim.keymap.set("n", "<C-t>", function() harpoon:list():select(2) end)
vim.keymap.set("n", "<C-n>", function() harpoon:list():select(3) end)
vim.keymap.set("n", "<C-s>", function() harpoon:list():select(4) end)
```

### Custom Lists
You can define custom behavior of a harpoon list by providing your own calls.

Here is a simple example where i create a list named `cmd` that takes the
current line in the editor and adds it to harpoon menu.  When
`list:select(...)` is called, we take the contents of the line and execute it
as a vim command

I don't think this is a great use of harpoon, but its meant to show how to add
your own custom lists.  You could imagine that a terminal list would be just as
easy to create.

```lua
local harpoon = require("harpoon")

harpoon:setup({
    -- Setting up custom behavior for a list named "cmd"
    "cmd" = {

        -- When you call list:append() this function is called and the return
        -- value will be put in the list at the end.
        --
        -- which means same behavior for prepend except where in the list the
        -- return value is added
        --
        -- @param possible_value string only passed in when you alter the ui manual
        add = function(possible_value)
            -- get the current line idx
            local idx = vim.fn.line(".")

            -- read the current line
            local cmd = vim.api.nvim_buf_get_lines(0, idx - 1, idx, false)[1]
            if cmd == nil then
                return nil
            end

            return {
                value = cmd,
                context = { ... any data you want ... },
            }
        end,

        --- This function gets invoked with the options being passed in from
        --- list:select(index, <...options...>)
        --- @param list_item {value: any, context: any}
        --- @param option any
        select = function(list_item, option)
            -- WOAH, IS THIS HTMX LEVEL XSS ATTACK??
            vim.cmd(list_item.value)
        end

    }
})

```

### Config
There is quite a bit of behavior you can configure via `harpoon:setup()`

* `settings`: is the global settings.  as of now there isn't a global setting in use, but once we have some custom behavior i'll put them here
* `default`: the default configuration for any list.  it is simply a file harpoon
* `[name] = HarpoonPartialConfigItem`: any named lists config.  it will be merged with `default` and override any behavior

**HarpoonPartialConfigItem Definition**
```
---@class HarpoonPartialConfigItem
---@field encode? (fun(list_item: HarpoonListItem): string)
---@field decode? (fun(obj: string): any)
---@field display? (fun(list_item: HarpoonListItem): string)
---@field select? (fun(list_item: HarpoonListItem, options: any?): nil)
---@field equals? (fun(list_line_a: HarpoonListItem, list_line_b: HarpoonListItem): boolean)
---@field add? fun(item: any?): HarpoonListItem
---@field BufLeave? fun(evt: any, list: HarpoonList): nil
---@field VimLeavePre? fun(evt: any, list: HarpoonList): nil
---@field get_root_dir? fun(): string
```

**Detailed Definitions**
* `encode`: how to encode the list item to the harpoon file.  if encode is `false`, then the list will not be saved to disk (think terminals)
* `decode`: how to decode the list
* `display`: how to display the list item in the ui menu
* `select`: the action taken when selecting a list item. called from `list:select(idx, options)`
* `equals`: how to compare two list items for equality
* `add`: called when `list:append()` or `list:prepend()` is called.  called with an item, which will be a string, when adding through the ui menu
* `BufLeave`: this function is called for every list on BufLeave.  if you need custom behavior, this is the place
* `VimLeavePre`: this function is called for every list on VimLeavePre.
* `get_root_dir`: used for creating relative paths.  defaults to `vim.loop.cwd()`

## ⇁ Social
For questions about Harpoon, there's a #harpoon channel on [the Primeagen's Discord](https://discord.gg/theprimeagen) server.
* [Discord](https://discord.gg/theprimeagen)
* [Twitch](https://www.twitch.tv/theprimeagen)
* [Twitter](https://twitter.com/ThePrimeagen)

## ⇁ Note to legacy Harpoon 1 users
Original Harpoon will remain in a frozen state and i will merge PRs in with _no
code review_ for those that wish to remain on that.  Harpoon 2 is significantly
better and allows for MUCH greater control.  Please migrate to that (will
become `master` within the next few months).

