Merge pull request #672 from bash-lsp/transpile-cli

Transpile CLI and extend with environment variables

Author: skovhus

server/bin/main.js

@@ -3,11 +3,11 @@
   "description": "A language server for Bash",
   "author": "Mads Hartmann",
   "license": "MIT",
-  "version": "4.3.0",
+  "version": "4.3.2",
   "main": "./out/server.js",
   "typings": "./out/server.d.ts",
   "bin": {
-    "bash-language-server": "./bin/main.js"
+    "bash-language-server": "./out/cli.js"
   },
   "repository": {
     "type": "git",

server/package.json

@@ -0,0 +1,77 @@
+#!/usr/bin/env node
+/* eslint-disable no-console */
+import * as LSP from 'vscode-languageserver/node'
+
+import BashServer from './server'
+import { DEFAULT_LOG_LEVEL, LOG_LEVEL_ENV_VAR } from './util/logger'
+
+const packageJson = require('../package')
+
+const PADDING = 38
+
+const commandsAndFlags = {
+  start: 'Start listening on stdin/stdout',
+  '-h, --help': 'Display this help and exit',
+  '-v, --version': 'Print the version and exit',
+} as const
+
+function printHelp() {
+  console.log(`Usage:
+${Object.entries(commandsAndFlags)
+  .map(
+    ([k, description]) =>
+      `  ${`bash-language-server ${k}`.padEnd(PADDING)} ${description}`,
+  )
+  .join('\n')}
+
+Environment variables:
+  ${LOG_LEVEL_ENV_VAR.padEnd(PADDING)} Set the log level (default: ${DEFAULT_LOG_LEVEL})
+
+Further documentation: ${packageJson.repository.url}`)
+}
+
+export function runCli() {
+  const args = process.argv.slice(2)
+
+  const start = args.find((s) => s == 'start')
+  const version = args.find((s) => s == '-v' || s == '--version')
+  const help = args.find((s) => s == '-h' || s == '--help')
+
+  if (start) {
+    listen()
+  } else if (version) {
+    console.log(packageJson.version)
+  } else if (help) {
+    printHelp()
+  } else {
+    if (args.length > 0) {
+      console.error(`Unknown command '${args.join(' ')}'.`)
+    }
+    printHelp()
+  }
+}
+
+export function listen() {
+  // Create a connection for the server.
+  // The connection uses stdin/stdout for communication.
+  const connection = LSP.createConnection(
+    new LSP.StreamMessageReader(process.stdin),
+    new LSP.StreamMessageWriter(process.stdout),
+  )
+
+  connection.onInitialize(
+    async (params: LSP.InitializeParams): Promise<LSP.InitializeResult> => {
+      const server = await BashServer.initialize(connection, params)
+      server.register(connection)
+      return {
+        capabilities: server.capabilities(),
+      }
+    },
+  )
+
+  connection.listen()
+}
+
+if (require.main === module) {
+  runCli()
+}