docs(smithy): how do you install this thing #3961

Author: justinmk

lsp/smithy_ls.lua

@@ -2,13 +2,42 @@
 ---
 --- https://github.com/awslabs/smithy-language-server
 ---
---- `Smithy Language Server`, A Language Server Protocol implementation for the Smithy IDL
-
--- pass 0 as the first argument to use STDIN/STDOUT for communication
-local cmd = { 'smithy-language-server', '0' }
+--- "Smithy Language Server", a Language server for the Smithy IDL.
+---
+--- smithy-language-server has no docs that say how to actually install it(?), so look at:
+--- https://github.com/smithy-lang/smithy-vscode/blob/600cfcf0db65edce85f02e6d50f5fa2b0862bc8d/src/extension.ts#L78
+---
+--- Maven package: https://central.sonatype.com/artifact/software.amazon.smithy/smithy-language-server
+---
+--- Installation:
+--- 1. Install coursier, or any tool that can install maven packages.
+---    ```
+---    brew install coursier
+---    ```
+--- 2. The LS is auto-installed and launched by:
+---    ```
+---    coursier launch software.amazon.smithy:smithy-language-server:0.7.0
+---    ```
 
 return {
-  cmd = cmd,
+  -- pass 0 as the first argument to use STDIN/STDOUT for communication
+  cmd = {
+    'coursier',
+    'launch',
+    'software.amazon.smithy:smithy-language-server:0.7.0',
+    '-M',
+    'software.amazon.smithy.lsp.Main',
+    '--',
+    '0',
+  },
   filetypes = { 'smithy' },
   root_markers = { 'smithy-build.json', 'build.gradle', 'build.gradle.kts', '.git' },
+  message_level = vim.lsp.protocol.MessageType.Log,
+  init_options = {
+    statusBarProvider = 'show-message',
+    isHttpEnabled = true,
+    compilerOptions = {
+      snippetAutoIndent = false,
+    },
+  },
 }