# go.nvim A modern go neovim plugin based on treesitter, nvim-lsp and dap debugger. It is written in Lua and async as much as possible. PR & Suggestions welcome. The plugin covers most features required for a gopher. - Async jobs with libuv - Syntax highlight & Texobject: Native treesitter support is faster and more accurate. All you need is a theme support treesitter, try [aurora](https://github.com/ray-x/aurora). Also, there are quite a few listed in [awesome-neovim](https://github.com/rockerBOO/awesome-neovim) - All the GoToXxx (E.g reference, implementation, definition, goto doc, peek code/doc etc) You need lspconfig setup. There are lots of posts on how to set it up. You can also check my [navigator](https://github.com/ray-x/navigator.lua) gopls setup [lspconfig.lua](https://github.com/ray-x/navigator.lua/blob/master/lua/navigator/lspclient/clients.lua) - Runtime lint/vet/compile: Supported by lsp (once you setup up your lsp client), GoLint with golangci-lint also supported - Build/Make/Test: Go.nvim provides supports for these by an async job wrapper. - Test coverage: run test coverage and show coverage sign - Dlv Debug: with [nvim-dap](https://github.com/mfussenegger/nvim-dap) and [Dap UI](https://github.com/rcarriga/nvim-dap-ui). - Load vscode launch configuration - Unit test: generate unit test framework with [gotests](https://github.com/cweill/gotests). Run test with richgo/ginkgo/go test - tag modify: Supports gomodifytags - Code format: Supports LSP format and GoFmt - CodeLens : gopls codelens and codelens action support - Comments: Add autodocument for your package/function/struct/interface. This feature is unique and can help you suppress golint errors... - Go to alternative go file (between test and source) - Test with ginkgo, richgo inside floaterm (to enable floaterm, guihua.lua has to be installed) - Go 1.18beta1 support, configure your go to `go1.18beta1` in config ## Installation Use your favorite package manager to install. The dependency `treesitter` (and optionally, treesitter-objects) will be installed the first time you use it. ### [vim-plug](https://github.com/junegunn/vim-plug) ```vim Plug 'ray-x/go.nvim' ``` ### [packer.nvim](https://github.com/wbthomason/packer.nvim) ```lua use 'ray-x/go.nvim' ``` Make sure the `$GOPATH/bin` path is added to your `$PATH` environment variable. To check this you can run ```bash echo $PATH | grep "$GOPATH/bin" ``` If nothing shows up, you can add the following to your shell config file: ```bash export PATH=$PATH:$GOPATH/bin ``` Add format in your vimrc. ```vim autocmd BufWritePre *.go :silent! lua require('go.format').gofmt() ``` To startup/setup the plugin ```lua require('go').setup() ``` ## Screenshots ### Add comments ![auto comments](https://github.com/ray-x/files/blob/master/img/go.nvim/comment.gif?raw=true) ### Add/Remove tags ![auto tag](https://github.com/ray-x/files/blob/master/img/go.nvim/tags.gif?raw=true) ### GoTest in floating term ![gotest](https://user-images.githubusercontent.com/1681295/143160335-b8046ffa-82cd-4d84-af3e-3b0dbb4c609e.png) ## refactor gorename gorename as an alternative to gopls rename as it supports rename across packages Command: GoRename ## code format nvim-lsp support goimport by default. ```vim autocmd BufWritePre (InsertLeave?) lua vim.lsp.buf.formatting_sync(nil,500) ``` The plugin provides code format, by default is goline + gofumpt (stricter version of gofmt) Use following code to format go code ```lua require("go.format").gofmt() -- gofmt only require("go.format").goimport() -- goimport + gofmt ``` ### Format on save To config format on save, add one of the following to your init.lua: #### Run gofmt on save ```lua -- Run gofmt on save vim.api.nvim_exec([[ autocmd BufWritePre *.go :silent! lua require('go.format').gofmt() ]], false) ``` #### Run gofmt + goimport on save ```lua -- Run gofmt + goimport on save vim.api.nvim_exec([[ autocmd BufWritePre *.go :silent! lua require('go.format').goimport() ]], false) ``` ## Auto fill Note: auto fill struct also supported by gopls lsp-action | command | Description | | ------------ | ------------------------------------------------------------- | | GoFillStruct | auto fill struct | | GoFillSwitch | fill switch | | GoIfErr | Add if err | | GoFixPlurals | change func foo(b int, a int, r int) -> func foo(b, a, r int) | ```go package foo import "io" func Foo() (io.Reader, error) { // the cursor on this line to add if err statement } ``` ![auto struct](https://github.com/ray-x/files/blob/master/img/go.nvim/fstruct.gif?raw=true) ## Textobject Supported by treesitter. TS provided better parse result compared to regular expression. See the example [treesitter config file](https://github.com/ray-x/go.nvim#text-object) on how to setup textobjects. Also with treesitter-objects, you can move, swap the selected blocks of codes, which is fast and accurate. ## Go binaries install and update The following go binaries are used in `go.nvim` (depends on your setup): - gofumpt - golines - goimports - gorename - gomodifytags - gotests - iferr - impl - fillstruct - fixplurals - fillswitch - dlv - ginkgo - richgo Normally if you run `GoFmt` and the configured binary (e.g. golines) was not installed, the plugin will install it for you. But the first run of `GoFmt` may fail. It is recommended to run `GoInstallBinaries` to install all binaries before using the plugin. | command | Description | | ------------------------------ | ------------------------------------------------------------------------------------------------------------------- | | GoInstallBinary go_binary_name | use `go install go_binary_url@latest` to install tool, if installed will skip | | GoUpdateBinary go_binary_name | use `go install go_binary_url@latest` Will force re-install if already installed, otherwise same as GoInstallBinary | | GoInstallBinaries | use `go install` to install all tools, skip the ones installed | | GoUpdateBinaries | use `go install` to update all tools to the latest version | ## Build and test | command | Description | | --------------------------------------------- | ------------------------------------------------------------------------ | | GoMake | make | | GoBuild | | | GoGenerate | | | GoRun | e.g. GoRun equal to `go run .`; or `GoRun ./cmd` equal to `go run ./cmd` | | GoStop {job_id} | `stop the job started with GoRun | | GoTest | go test ./... | | GoTest -c | go test -c current_file_path | | GoTest -tags=yourtags | go test ./... -tags=yourtags | | GoTest package_path -tags=yourtags | go test packagepath -tags=yourtags | | GoTest package_path -tags=yourtags other_args | go test packagepath -tags=yourtags other_args | | GoLint | golangci-lint | | GoGet package_url | go get package_url | | GoVet | go vet | | GoCoverage | go test -coverprofile | Show test coverage: GoTestCoverage Provided wrapper for gobulild/test etc with async make Also suggest to use [vim-test](https://github.com/vim-test/vim-test), which can run running tests on different granularities. ## Unit test with [gotests](https://github.com/cweill/gotests) and testify Support table based unit test auto generate, parse current function/method name using treesitter | command | Description | | ------------------------ | ------------------------------------------------------- | | GoTestFunc | run test for current func | | GoTestFunc -tags=yourtag | run test for current func with `-tags yourtag` option | | GoTestFile | run test for current file | | GoTestFile -tags=yourtag | run test for current folder with `-tags yourtag` option | | GoTestPkg | run test for current package/folder | | GoTestPkg -tags=yourtag | run test for current folder with `-tags yourtag` option | | GoAddTest | | | GoAddExpTest | Add tests for exported funcs | | GoAddAllTest | Add tests for all funcs | Note: For GoTestXXX You can add avaliable arguments e.g. `GoTest -tags=integration ./internal/web -bench=. -count=1 -` ## GoDoc Show go doc for api in neovim floating window. e.g. `GoDoc fmt.Println` ![Godoc](https://user-images.githubusercontent.com/1681295/133886804-cc110fae-6fbf-4218-9c22-07fc9d6a64d2.jpg) If no argument provided, fallback to lsp.hover() ## Modifytags Modify struct tags by [`gomodifytags`](https://github.com/fatih/gomodifytags) and treesitter | command | Description | | ---------- | ----------- | | GoAddTag | | | GoRmTag | | | GoClearTag | | ## GoFmt nvim-lsp support goimport by default. The plugin provided a new formatter, goline + gofumpt (stricter version of gofmt) | command | Description | | -------- | --------------------------- | | GoFmt | goline + gofumpt | | GoImport | goline + goimport + gofumpt | ## GoImpl generate method stubs for implementing an interface Usage: ```` :GoImpl {receiver} {interface} Also you can put cursor on struct and run ```vim :GoImpl {interface} ```` e.g: ``` :GoImpl f *File io.Reader ``` ## Debug | command | Description | | ---------------- | ------------------------------------------------ | | GoDebug | start debug session | | GoDebug test | start debug session for go test file | | GoDebug restart | restart debug session for go test file | | GoDebug nearest | start debug session for nearest go test function | | GoDebug file | same as GoDebug | | GoDebug stop | stop debug session and unmap debug keymap | | GoBreakToggle | | | GoBreakCondition | conditional break | ## Switch between go and test file | command | Description | | ---------------- | ------------------------------------------------------- | | GoAlt / GoAlt! | open alternative go file (use ! to create if not exist) | | GoAltS / GoAltS! | open alternative go file in split | | GoAltV / GoAltV! | open alternative go file in vertical split | ## Comments and Doc Auto doc (to suppress golang-lint warning), generate comments by treesitter parsing result ```go type GoLintComplaining struct{} ``` And run ```lua lua.require('go.comment').gen() -- or your faviourite key binding and setup placeholder "no more complaint ;P" ``` The code will be: ```go // GoLintComplaining struct no more complaint ;P type GoLintComplaining struct{} ``` ## GoModeTidy ## LSP Nvim-lsp is good enough for a gopher. If you looking for a better GUI. You can install [navigator](https://github.com/ray-x/navigator.lua), or lspsaga, and lsp-utils etc. The goal of go.nvim is more provide unique functions releated to gopls instead of a general lsp gui client. The lsp config in go.nvim has a none default setup and contains some improvement and I would suggest you to use. ## LSP CodeLens Gopls supports code lens. To run gopls code lens action `GoCodeLenAct` Note: codelens need to be enabled in gopls, check default config in ## LSP CodeActions You can use native code action provided by lspconfig. If you installed guihua, you can also use a GUI version of code action `GoCodeAction` ## Lint Supported by LSP, also GoLint command (by calling golangcl-lint) if you need background golangci-lint check, you can configure it with ALE ## Debug with dlv Setup for Debug provided. Need Dap and Dap UI plugin ![dap](https://user-images.githubusercontent.com/1681295/125160289-743ba080-e1bf-11eb-804f-6a6d227ec33b.jpg) GDB style key mapping is used ### Keymaps | key | Description | | --- | ---------------------------------------- | | c | continue | | n | next | | s | step | | o | stepout | | S | cap S: stop debug | | u | up | | D | cap D: down | | C | cap C: run to cursor | | b | toggle breakpoint | | P | cap P: pause | | p | print, hover value (also in visual mode) | ### Moving from vscode-go debug Please check [Vscode Launch configurations](https://code.visualstudio.com/docs/editor/debugging#_launch-configurations) for more info go.nvim support launch debuger from vscode-go .vscode/launch.json configurations If launch.json is valid, run `GoDebug` will launch from the launch.json configuration. #### Note: Please use jsonls/null-ls check your launch.json is valid json file. Following syntax is not supported - Trailing comma - Comment Here is a sample [launch.json](https://github.com/ray-x/go.nvim/blob/master/playground/sampleApp/.vscode/launch.json) ### Commands | Command | Description | | -------------- | ----------------------------------------------------------------------------------------------- | | GoDebug | Start debugger, to debug test, run `GoDebug test`, to add addition args run `GoDebug arg1 arg2` | | GoDebugConfig | Open launch.json file | | GoBreakToggle | toggle break point | | BreakCondition | conditional break point | | ReplRun | dap repl run_last | | ReplToggle | dap repl toggle | ### Required DAP plugins The plugin will setup debugger. But you need to install - dap - 'mfussenegger/nvim-dap' - dap ui (optional) - 'rcarriga/nvim-dap-ui' - dap virtual text (optional) - 'theHamsta/nvim-dap-virtual-text' Also you can check telescope dap extension : nvim-telescope/telescope-dap.nvim Sample vimrc for DAP ```viml Plug 'mfussenegger/nvim-dap' Plug 'rcarriga/nvim-dap-ui' Plug 'theHamsta/nvim-dap-virtual-text' " Plug 'nvim-telescope/telescope-dap.nvim' ``` ## Commands Check [go.lua](https://github.com/ray-x/go.nvim/blob/master/lua/go.lua) on all the commands provided ## configuration Configure from lua suggested, The default setup: ```lua require('go').setup({ go='go', -- go command, can be go[default] or go1.18beta1 goimport='gopls', -- goimport command, can be gopls[default] or goimport fillstruct = 'gopls', -- can be nil (use fillstruct, slower) and gopls gofmt = 'gofumpt', --gofmt cmd, max_line_len = 120, -- max line length in goline format tag_transform = false, -- tag_transfer check gomodifytags for details test_template = '', -- default to testify if not set; g:go_nvim_tests_template check gotests for details test_template_dir = '', -- default to nil if not set; g:go_nvim_tests_template_dir check gotests for details comment_placeholder = '' , -- comment_placeholder your cool placeholder e.g. ﳑ     icons = {breakpoint = '🧘', currentpos = '🏃'}, verbose = false, -- output loginf in messages lsp_cfg = false, -- true: use non-default gopls setup specified in go/lsp.lua -- false: do nothing -- if lsp_cfg is a table, merge table with with non-default gopls setup in go/lsp.lua, e.g. -- lsp_cfg = {settings={gopls={matcher='CaseInsensitive', ['local'] = 'your_local_module_path', gofumpt = true }}} lsp_gofumpt = false, -- true: set default gofmt in gopls format to gofumpt lsp_on_attach = nil, -- nil: use on_attach function defined in go/lsp.lua, -- when lsp_cfg is true -- if lsp_on_attach is a function: use this function as on_attach function for gopls lsp_codelens = true, -- set to false to disable codelens, true by default lsp_diag_hdlr = true, -- hook lsp diag handler lsp_document_formatting = true, -- set to true: use gopls to format -- false if you want to use other formatter tool(e.g. efm, nulls) gopls_cmd = nil, -- if you need to specify gopls path and cmd, e.g {"/home/user/lsp/gopls", "-logfile","/var/log/gopls.log" } gopls_remote_auto = true, -- add -remote=auto to gopls dap_debug = true, -- set to false to disable dap dap_debug_keymap = true, -- true: use keymap for debugger defined in go/dap.lua -- false: do not use keymap in go/dap.lua. you must define your own. dap_debug_gui = true, -- set to true to enable dap gui, highly recommand dap_debug_vt = true, -- set to true to enable dap virtual text build_tags = "tag1,tag2", -- set default build tags textobjects = true, -- enable default text jobects through treesittter-text-objects test_runner = 'go', -- richgo, go test, richgo, dlv, ginkgo run_in_floaterm = false, -- set to true to run in float window. --float term recommand if you use richgo/ginkgo with terminal color }) ``` You will need to add keybind yourself: e.g ```lua vim.cmd("autocmd FileType go nmap l GoLint") vim.cmd("autocmd FileType go nmap gc :lua require('go.comment').gen()") ``` ## Text object I did not provide textobject support in the plugin. Please use treesitter textobject plugin. My treesitter config: ```lua require "nvim-treesitter.configs".setup { incremental_selection = { enable = enable, keymaps = { -- mappings for incremental selection (visual mappings) init_selection = "gnn", -- maps in normal mode to init the node/scope selection node_incremental = "grn", -- increment to the upper named parent scope_incremental = "grc", -- increment to the upper scope (as defined in locals.scm) node_decremental = "grm" -- decrement to the previous node } }, textobjects = { -- syntax-aware textobjects enable = enable, lsp_interop = { enable = enable, peek_definition_code = { ["DF"] = "@function.outer", ["DF"] = "@class.outer" } }, keymaps = { ["iL"] = { -- you can define your own textobjects directly here go = "(function_definition) @function", }, -- or you use the queries from supported languages with textobjects.scm ["af"] = "@function.outer", ["if"] = "@function.inner", ["aC"] = "@class.outer", ["iC"] = "@class.inner", ["ac"] = "@conditional.outer", ["ic"] = "@conditional.inner", ["ae"] = "@block.outer", ["ie"] = "@block.inner", ["al"] = "@loop.outer", ["il"] = "@loop.inner", ["is"] = "@statement.inner", ["as"] = "@statement.outer", ["ad"] = "@comment.outer", ["am"] = "@call.outer", ["im"] = "@call.inner" }, move = { enable = enable, set_jumps = true, -- whether to set jumps in the jumplist goto_next_start = { ["]m"] = "@function.outer", ["]]"] = "@class.outer" }, goto_next_end = { ["]M"] = "@function.outer", ["]["] = "@class.outer" }, goto_previous_start = { ["[m"] = "@function.outer", ["[["] = "@class.outer" }, goto_previous_end = { ["[M"] = "@function.outer", ["[]"] = "@class.outer" } }, select = { enable = enable, keymaps = { -- You can use the capture groups defined in textobjects.scm ["af"] = "@function.outer", ["if"] = "@function.inner", ["ac"] = "@class.outer", ["ic"] = "@class.inner", -- Or you can define your own textobjects like this ["iF"] = { python = "(function_definition) @function", cpp = "(function_definition) @function", c = "(function_definition) @function", java = "(method_declaration) @function", go = "(method_declaration) @function" } } }, swap = { enable = enable, swap_next = { ["a"] = "@parameter.inner" }, swap_previous = { ["A"] = "@parameter.inner" } } } } ``` ## Nvim LSP setup go.nvim provided a better non-default setup for gopls (includes debounce, staticcheck, diagnosticsDelay etc) This gopls setup provided by go.nvim works perfectly fine for most of the cases. You can also install [navigator.lua](https://github.com/ray-x/navigator.lua) which can auto setup all lsp clients and provides a better GUI. For diagnostic issue, you can use the default setup. There are also quite a few plugins that you can use to explore issues, e.g. [navigator.lua](https://github.com/ray-x/navigator.lua), [folke/lsp-trouble.nvim](https://github.com/folke/lsp-trouble.nvim). [Nvim-tree](https://github.com/kyazdani42/nvim-tree.lua) and [Bufferline](https://github.com/akinsho/nvim-bufferline.lua) also introduced lsp diagnostic hooks. ## Integrate with nvim-lsp-installer (suggested by @mattbailey) ```lua local path = require 'nvim-lsp-installer.path' local install_root_dir = path.concat {vim.fn.stdpath 'data', 'lsp_servers'} require('go').setup({ gopls_cmd = {install_root_dir .. '/go/gopls'}, filstruct = 'gopls', dap_debug = true, dap_debug_gui = true }) ``` If you want to use gopls setup provided by go.nvim ```lua -- setup your go.nvim -- make sure lsp_cfg is disabled require('go').setup{...} local lsp_installer_servers = require'nvim-lsp-installer.servers' local server_available, requested_server = lsp_installer_servers.get_server("gopls") if server_available then requested_server:on_ready(function () local opts = require'go.lsp'.config() -- config() return the go.nvim gopls setup requested_server:setup(opts) end) if not requested_server:is_installed() then -- Queue the server to be installed requested_server:install() end end ``` ## Sample vimrc The following vimrc will enable all features provided by go.nvim ```viml set termguicolors call plug#begin('~/.vim/plugged') Plug 'neovim/nvim-lspconfig' Plug 'nvim-treesitter/nvim-treesitter' Plug 'mfussenegger/nvim-dap' Plug 'rcarriga/nvim-dap-ui' Plug 'theHamsta/nvim-dap-virtual-text' Plug 'ray-x/guihua.lua' " float term, codeaction and codelens gui support Plug 'ray-x/go.nvim' call plug#end() lua <