Neogen - Your Annotation Toolkit

• Features
• Requirements
• Installation
• Usage
• Configuration
• Supported Languages
• Adding Languages
• GIFS
• Credits
• Support

• Create annotations with one keybind, and jump your cursor in the inserted annotation
• Defaults for multiple languages and annotation conventions
• Extremely customizable and extensible
• Written in lua (and uses Tree-sitter)

• Install nvim-treesitter

Use your favorite package manager to install Neogen, e.g:

use {
    "danymat/neogen",
    config = function()
        require('neogen').setup {
            enabled = true
        }
    end,
    requires = "nvim-treesitter/nvim-treesitter"
}

• If you want to keep it simple, you can use the :Neogen command:

" will generate annotation for the function you're inside
:Neogen
" or you can force a certain type of annotation.
" It'll find the next upper node that matches the type
" E.g if you're on a method of a class and do `:Neogen class`, it'll find the class declaration and generate the annotation.
:Neogen func|class|type|...

• If you like to use the lua API, I exposed a function to generate the annotations.

require('neogen').generate()

You can bind it to your keybind of choice, like so:

local opts = { noremap = true, silent = true }
vim.api.nvim_set_keymap("n", "<Leader>nf", ":lua require('neogen').generate()<CR>", opts)

Calling the generate function without any parameters will try to generate annotations for the current function.

You can provide some options for the generate, like so:

require('neogen').generate({
    type = "func" -- the annotation type to generate. Currently supported: func, class, type, file
})

For example, I can add an other keybind to generate class annotations:

local opts = { noremap = true, silent = true }
vim.api.nvim_set_keymap("n", "<Leader>nc", ":lua require('neogen').generate({ type = 'class' })<CR>", opts)

I added support passing cursor positionings in templates. That means you can now cycle your cursor between different parts of the annotation.

To configure it to the keybind of your choice, you can do something like this:

local opts = { noremap = true, silent = true }
vim.api.nvim_set_keymap("n", "<C-n>", ":lua require('neogen').jump_next()<CR>", opts)
vim.api.nvim_set_keymap("n", "<C-p>", ":lua require('neogen').jump_prev()<CR>", opts)

If you want to use a key that's already used for completion purposes, take a look at the code snippet here:

local cmp = require('cmp')
local neogen = require('neogen')

local t = function(str)
    return vim.api.nvim_replace_termcodes(str, true, true, true)
end

local check_back_space = function()
    local col = vim.fn.col '.' - 1
    return col == 0 or vim.fn.getline('.'):sub(col, col):match '%s' ~= nil
end

cmp.setup {
    ...

    -- You must set mapping if you want.
    mapping = {
		["<tab>"] = cmp.mapping(function(fallback)
			if neogen.jumpable() then
				vim.fn.feedkeys(t("<cmd>lua require('neogen').jump_next()<CR>"), "")
			else
				fallback()
			end
		end, {
			"i",
			"s",
		}),
		["<S-tab>"] = cmp.mapping(function(fallback)
			if neogen.jumpable(-1) then
				vim.fn.feedkeys(t("<cmd>lua require('neogen').jump_prev()<CR>"), "")
			else
				fallback()
			end
		end, {
			"i",
			"s",
		}),
    },
    ...
}

require('neogen').setup {
        enabled = true,             --if you want to disable Neogen
        input_after_comment = true, -- (default: true) automatic jump (with insert mode) on inserted annotation
        -- jump_map = "<C-e>"       -- (DROPPED SUPPORT, see [here](#cycle-between-annotations) !) The keymap in order to jump in the annotation fields (in insert mode)
    }
}

If you're not satisfied with the default configuration for a language, you can change the defaults like this:

require('neogen').setup {
    enabled = true,
	languages = {
	    lua = {
	        template = {
                    annotation_convention = "emmylua" -- for a full list of annotation_conventions, see supported-languages below,
		    ... -- for more template configurations, see the language's configuration file in configurations/{lang}.lua
		}
	    },
	    ...
    }
}

There is a list of supported languages and fields, with their annotation style

1. Using the defaults to generate a new language support: Adding Languages
2. (advanced) Only if the defaults aren't enough, please see here: Advanced Integration

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