feat: add 'automatic_installation' feature toggle to setup options (#638)

5 files changed, 22 insertions, 6 deletions

diff --git a/README.md b/README.md
index d22b6c12..f1804a35 100644
--- a/README.md
+++ b/README.md
@@ -114,7 +114,8 @@ Example:
 
 ```lua
 require("nvim-lsp-installer").setup({
-    ensure_installed = { "sumneko_lua", "rust_analyzer" },
+    ensure_installed = { "rust_analyzer", "sumneko_lua" },
+    automatic_installation = true,
     ui = {
         icons = {
             server_installed = "✓",
@@ -267,8 +268,10 @@ Illustrations in the logo are derived from [@Kaligule](https://schauderbasis.de/
 
 ```lua
 local DEFAULT_SETTINGS = {
-    -- A list of servers to automatically install. Example: { "rust_analyzer", "sumneko_lua" }
+    -- A list of servers to automatically install if they're not already installed. Example: { "rust_analyzer", "sumneko_lua" }
     ensure_installed = {},
+    -- Whether servers that are set up (via lspconfig) should be automatically installed if they're not already installed.
+    automatic_installation = false,
     ui = {
         icons = {
             -- The list icon to use for installed servers.
diff --git a/doc/nvim-lsp-installer.txt b/doc/nvim-lsp-installer.txt
index 75b9e242..b9b05e55 100644
--- a/doc/nvim-lsp-installer.txt
+++ b/doc/nvim-lsp-installer.txt
@@ -158,6 +158,8 @@ Refer to the |nvim-lsp-installer-default-settings| for all available settings.
 Example: >
 
     require("nvim-lsp-installer").setup({
+        ensure_installed = { "rust_analyzer", "sumneko_lua" },
+        automatic_installation = true,
         ui = {
             icons = {
                 server_installed = "✓",
@@ -172,8 +174,10 @@ Example: >
 The following settings are applied by default. >
 
     local DEFAULT_SETTINGS = {
-        -- A list of servers to automatically install. Example: { "rust_analyzer", "sumneko_lua" }
+        -- A list of servers to automatically install if they're not already installed. Example: { "rust_analyzer", "sumneko_lua" }
         ensure_installed = {},
+        -- Whether servers that are set up (via lspconfig) should be automatically installed if they're not already installed.
+        automatic_installation = false,
         ui = {
             icons = {
                 -- The list icon to use for installed servers.
diff --git a/lua/nvim-lsp-installer.lua b/lua/nvim-lsp-installer.lua
index f41dbbf7..631f66a2 100644
--- a/lua/nvim-lsp-installer.lua
+++ b/lua/nvim-lsp-installer.lua
@@ -37,9 +37,12 @@ function M.setup(config)
     end
     settings.uses_new_setup = true
     require("nvim-lsp-installer.middleware").register_lspconfig_hook()
-    vim.schedule(function()
-        ensure_installed(settings.current.ensure_installed)
-    end)
+
+    if vim.tbl_islist(settings.current.ensure_installed) then
+        vim.schedule(function()
+            ensure_installed(settings.current.ensure_installed)
+        end)
+    end
 end
 
 M.info_window = {
diff --git a/lua/nvim-lsp-installer/middleware.lua b/lua/nvim-lsp-installer/middleware.lua
index 3e01b976..cd5c508d 100644
--- a/lua/nvim-lsp-installer/middleware.lua
+++ b/lua/nvim-lsp-installer/middleware.lua
@@ -1,5 +1,6 @@
 local util = require "lspconfig.util"
 local servers = require "nvim-lsp-installer.servers"
+local settings = require "nvim-lsp-installer.settings"
 
 local M = {}
 
@@ -25,6 +26,9 @@ function M.register_lspconfig_hook()
         local ok, server = servers.get_server(config.name)
         if ok then
             merge_in_place(config, server._default_options)
+            if settings.current.automatic_installation and not server:is_installed() then
+                server:install()
+            end
         end
     end)
 end
diff --git a/lua/nvim-lsp-installer/settings.lua b/lua/nvim-lsp-installer/settings.lua
index 7a36e217..44c739db 100644
--- a/lua/nvim-lsp-installer/settings.lua
+++ b/lua/nvim-lsp-installer/settings.lua
@@ -6,6 +6,8 @@ local M = {}
 local DEFAULT_SETTINGS = {
     -- A list of servers to automatically install. Example: { "rust_analyzer", "sumneko_lua" }
     ensure_installed = {},
+    -- Whether servers that are set up (via lspconfig) should be automatically installed if they're not already installed.
+    automatic_installation = false,
     ui = {
         icons = {
             -- The list icon to use for installed servers.