feat: LSP serverInfo

Also includes a small refactor to app-version to make it easier to get
just the package version

Author: joe-p

src/cli/app-version.ts

@@ -3,25 +3,31 @@ import { fileURLToPath } from 'node:url'
 import pathe from 'pathe'
 import { Constants } from '../constants'
 
-export function appVersion(options?: { name?: string; withAVMVersion?: boolean }): string {
+export function packageVersion(): string {
   let dirName = pathe.dirname(fileURLToPath(import.meta.url))
-  const name = options?.name ?? 'puya-ts'
-  const withAVMVersion = options?.withAVMVersion ?? true
 
   while (true) {
     const packageJsonPath = pathe.join(dirName, 'package.json')
     if (fs.existsSync(packageJsonPath)) {
       const version = JSON.parse(fs.readFileSync(packageJsonPath, 'utf8')).version
-      return [`${name} ${version}`]
-        .concat(
-          withAVMVersion
-            ? ['', 'Targets:', `puya ${Constants.targetedPuyaVersion}`, `AVM ${Constants.supportedAvmVersions.join(', ')}`]
-            : [`puya ${Constants.targetedPuyaVersion}`],
-        )
-        .join('\r\n')
+      return version
     }
     if (dirName === pathe.dirname(dirName)) break
     dirName = pathe.dirname(dirName)
   }
-  return `Cannot determine puya-ts version`
+  return 'unknown'
+}
+
+export function appVersion(options?: { name?: string; withAVMVersion?: boolean }): string {
+  const name = options?.name ?? 'puya-ts'
+  const withAVMVersion = options?.withAVMVersion ?? true
+
+  const version = packageVersion()
+  return [`${name} ${version}`]
+    .concat(
+      withAVMVersion
+        ? ['', 'Targets:', `puya ${Constants.targetedPuyaVersion}`, `AVM ${Constants.supportedAvmVersions.join(', ')}`]
+        : [`puya ${Constants.targetedPuyaVersion}`],
+    )
+    .join('\r\n')
 }

src/language-server/puya-language-server.ts

@@ -1,6 +1,6 @@
 import { TextDocument } from 'vscode-languageserver-textdocument'
 import * as lsp from 'vscode-languageserver/node'
-import { appVersion } from '../cli/app-version'
+import { appVersion, packageVersion } from '../cli/app-version'
 import { Constants } from '../constants'
 import { logger, LogLevel } from '../logger'
 import { LanguageServerLogSink } from '../logger/sinks/language-server-log-sink'
@@ -40,6 +40,8 @@ export type LanguageServerOptions = {
   customPuyaPath?: string
 }
 
+const PACKAGE_VERSION = packageVersion()
+
 export class PuyaLanguageServer {
   readonly documents = new lsp.TextDocuments(TextDocument)
   readonly triggers = new CompileTriggerQueue()
@@ -85,6 +87,10 @@ export class PuyaLanguageServer {
       workspaces: this.workspaceFolders,
     })
     return {
+      serverInfo: {
+        name: 'Puya-TS Language Server',
+        version: PACKAGE_VERSION,
+      },
       capabilities: {
         textDocumentSync: lsp.TextDocumentSyncKind.Incremental,
         codeActionProvider: {