This is a simple plugin to add support for a tmux list in Harpoon 2.0. Currently this only supports a subset of the original Harpoon Version One implementation, and offers some basic configuration options.

The list is provided via a build_list function that can be used within the harpoon options. A minimal configuration using lazy.nvim and loading harpoon-tmux as a dependency of ThePrimeagen/harpoon would look as follows:

{
    'ThePrimeagen/harpoon',
    dependencies = {
        'nvim-lua/plenary.nvim',
        'atidyshirt/harpoon-tmux',
    },
    branch = 'harpoon2',
    config = function ()
        local harpoon = require('harpoon');
        local harpoon_tmux = require('harpoon-tmux');
        harpoon:setup({ ['tmux'] = harpoon_tmux.build_list() })
    end,
}

Key Bindings that can be setup via the lazy.nvim config hook:

vim.keymap.set("n", "gt", function() harpoon_tmux.go_to_terminal(1) end)
vim.keymap.set("n", "gy", function() harpoon_tmux.go_to_terminal(2) end)
vim.keymap.set("n", "<leader><space>m", function() harpoon.ui:toggle_quick_menu(harpoon:list('tmux')) end)
vim.keymap.set("n", "<leader><space>j", function() harpoon:list('tmux'):select(1) end)
vim.keymap.set("n", "<leader><space>k", function() harpoon:list('tmux'):select(2) end)
vim.keymap.set("n", "<leader><space>l", function() harpoon:list('tmux'):select(3) end)
vim.keymap.set("n", "<leader><space>;", function() harpoon:list('tmux'):select(4) end)

In order for pane indexes to work correctly without bugs, we recommend adding the following lines to your tmux config, as this plugin does not include any way to account for an index being renumbered after harpoon-tmux has assigned the index.

set -g renumber-windows off
set -g base-index 1
setw -g pane-base-index 1

Another recommendation is to bind a method to get back to neovim from a tmux window. The following binding is an option, (we can bind this to any value we want). ctrl-o just allows for me to pretend that tmux navigation as part of the jump list for my personal workflow.

The is_vim variable is assigned to determine if we are already in a vim shell. If we are already in a vim shell, then we do not want to forward the command to tmux and instead provide the base/default neovim behaviour of navigating the jump list (This may or may not be required/desirable depending on which key you bind to get back to neovim.

is_vim="ps -o state= -o comm= -t '#{pane_tty}' | grep -iqE '^[^TXZ ]   (\\S \\/)?g?(view|n?vim?x?)(diff)?$'"
bind-key -n 'C-o' if-shell "$is_vim" 'send-keys C-o'  'last-window'

Currently there is just two options for the user to configure. The options that are added in the below code snippet are the default options provided to build_list but can be overwritten with the behaviour your heart desires.

1. Mapping of the command indexes (location in the harpoon command list => tmux terminal index to run command in).
2. Auto closing of all tmux windows harpoon-tmux knows about (created with go_to_terminal when we kill the neovim instance.

{
    'ThePrimeagen/harpoon',
    dependencies = {
        'nvim-lua/plenary.nvim',
        'atidyshirt/harpoon-tmux',
    },
    branch = 'harpoon2',
    config = function ()
        local harpoon = require('harpoon');
        local harpoon_tmux = require('harpoon-tmux');
        harpoon:setup({ 
            ['tmux'] = harpoon_tmux.build_list({
                tmux_autoclose_windows = true,
                ---@type table<number, { term_index: number, command_index: number }>
                command_terminal_index_allocator = {
                    { term_index = 1, cmd_index = 1 },
                    { term_index = 1, cmd_index = 2 },
                    { term_index = 2, cmd_index = 3 },
                    { term_index = 2, cmd_index = 4 },
                }
            })
        })
    end,
}