add tflint (#52)

* add tflint

* Update lua/nvim-lsp-installer/servers/tflint/init.lua

5 files changed, 64 insertions, 1 deletions

diff --git a/lua/nvim-lsp-installer.lua b/lua/nvim-lsp-installer.lua
index fd14f834..3aad98a2 100644
--- a/lua/nvim-lsp-installer.lua
+++ b/lua/nvim-lsp-installer.lua
@@ -41,6 +41,7 @@ local _SERVERS = {
     ["tailwindcss"] = require "nvim-lsp-installer.servers.tailwindcss",
     ["terraformls"] = require "nvim-lsp-installer.servers.terraformls",
     ["texlab"] = require "nvim-lsp-installer.servers.texlab",
+    ["tflint"] = require "nvim-lsp-installer.servers.tflint",
     ["tsserver"] = require "nvim-lsp-installer.servers.tsserver",
     ["vimls"] = require "nvim-lsp-installer.servers.vimls",
     ["vuels"] = require "nvim-lsp-installer.servers.vuels",
diff --git a/lua/nvim-lsp-installer/installers/shell.lua b/lua/nvim-lsp-installer/installers/shell.lua
index e21d33c3..6cbe26ae 100644
--- a/lua/nvim-lsp-installer/installers/shell.lua
+++ b/lua/nvim-lsp-installer/installers/shell.lua
@@ -28,8 +28,12 @@ function M.raw(raw_script, opts)
         vim.cmd [[new]]
         vim.fn.termopen((opts.prefix or default_opts.prefix) .. raw_script, jobstart_opts)
         vim.o.shell = shell
-        vim.cmd [[startinsert]]
+        vim.cmd [[startinsert]] -- so that we tail the term log nicely ¯\_(ツ)_/¯
     end
 end
 
+function M.remote(url, opts)
+    return M.raw(("curl -s -f %q | bash"):format(url), opts)
+end
+
 return M
diff --git a/lua/nvim-lsp-installer/server.lua b/lua/nvim-lsp-installer/server.lua
index e4e684b3..8b72ce53 100644
--- a/lua/nvim-lsp-installer/server.lua
+++ b/lua/nvim-lsp-installer/server.lua
@@ -25,6 +25,11 @@ M.Server.__index = M.Server
 --
 -- @field pre_install_check (function)   An optional function to be executed before the installer. This allows ensuring that any prerequisites are fulfilled.
 --                                       This could for example be verifying that required build tools are installed.
+--
+-- @field post_setup (function)          An optional function to be executed after the setup function has been successfully called.
+--                                       Use this to defer setting up server specific things until they're actually
+--                                       needed, like custom commands.
+--
 function M.Server:new(opts)
     return setmetatable({
         name = opts.name,
@@ -32,6 +37,7 @@ function M.Server:new(opts)
         _root_dir = opts.root_dir,
         _default_options = opts.default_options,
         _pre_install_check = opts.pre_install_check,
+        _post_setup = opts.post_setup,
     }, M.Server)
 end
 
@@ -40,6 +46,9 @@ function M.Server:setup(opts)
     -- The reason for this is because once a lspconfig server has been imported, it's
     -- automatically registered with lspconfig and causes it to show up in :LspInfo and whatnot.
     require("lspconfig")[self.name].setup(vim.tbl_deep_extend("force", self._default_options, opts))
+    if self._post_setup then
+        self._post_setup()
+    end
 end
 
 function M.Server:get_default_options()
diff --git a/lua/nvim-lsp-installer/servers/tflint/README.md b/lua/nvim-lsp-installer/servers/tflint/README.md
new file mode 100644
index 00000000..359a6165
--- /dev/null
+++ b/lua/nvim-lsp-installer/servers/tflint/README.md
@@ -0,0 +1,9 @@
+# tflint
+
+## Installing TFLint plugins
+
+To install TFLint plugins, using the same installation of TFLint as nvim-lsp-installer, you may run the `:TFLintInit`
+command. This command assumes that:
+
+1. there exists a `.tflint.hcl` file in neovim's current working directory.
+1. you've called `server:setup(opts)` for `tflint`
diff --git a/lua/nvim-lsp-installer/servers/tflint/init.lua b/lua/nvim-lsp-installer/servers/tflint/init.lua
new file mode 100644
index 00000000..396f1cf9
--- /dev/null
+++ b/lua/nvim-lsp-installer/servers/tflint/init.lua
@@ -0,0 +1,40 @@
+local server = require "nvim-lsp-installer.server"
+local notify = require "nvim-lsp-installer.notify"
+local path = require "nvim-lsp-installer.path"
+local shell = require "nvim-lsp-installer.installers.shell"
+
+local root_dir = server.get_server_root_path "tflint"
+
+local bin_path = path.concat { root_dir, "tflint" }
+
+return server.Server:new {
+    name = "tflint",
+    root_dir = root_dir,
+    installer = shell.remote("https://raw.githubusercontent.com/terraform-linters/tflint/master/install_linux.sh", {
+        env = {
+            TFLINT_INSTALL_PATH = root_dir,
+            TFLINT_INSTALL_NO_ROOT = 1,
+        },
+    }),
+    default_options = {
+        cmd = { bin_path, "--langserver" },
+    },
+    post_setup = function()
+        function _G.lsp_installer_tflint_init()
+            notify "Installing TFLint plugins…"
+            vim.fn.termopen(("%q --init"):format(bin_path), {
+                cwd = path.cwd(),
+                on_exit = function(_, exit_code)
+                    if exit_code ~= 0 then
+                        notify(("Failed to install TFLint (exit code %)."):format(exit_code))
+                    else
+                        notify "Successfully installed TFLint plugins."
+                    end
+                end,
+            })
+            vim.cmd [[startinsert]] -- so that we tail the term log nicely ¯\_(ツ)_/¯
+        end
+
+        vim.cmd [[ command! TFLintInit call v:lua.lsp_installer_tflint_init() ]]
+    end,
+}