Add Terraform version info

This commit adds a LanguageStatusItem that shows the discovered Terraform version in the current workspace.

src/extension.ts

@@ -1,3 +1,4 @@
+import * as tfStatus from './status/terraform';
 import * as terraform from './terraform';
 import * as vscode from 'vscode';
 import TelemetryReporter from '@vscode/extension-telemetry';
@@ -206,6 +207,16 @@ export async function activate(context: vscode.ExtensionContext): Promise<void>
   );
 
   await startLanguageServer(context);
+
+  /*
+   In the future, we can hook this to onDidChange or a similar handler, but currently
+   we only detect Terraform versions at start inside terraform-ls, so it is sufficient to ask once here
+  */
+  const workspaces = vscode.workspace.workspaceFolders;
+  if (workspaces !== undefined) {
+    const response = await terraform.terraformVersion(workspaces[0].uri.toString(), client, reporter);
+    tfStatus.setTerraformVersion(response.discovered_version);
+  }
 }
 
 export async function deactivate(): Promise<void> {

src/status/terraform.ts

@@ -0,0 +1,27 @@
+import * as vscode from 'vscode';
+
+const terraformStatus = vscode.languages.createLanguageStatusItem('terraform.status', [
+  { language: 'terraform' },
+  { language: 'terraform-vars' },
+]);
+terraformStatus.name = 'Terraform';
+terraformStatus.detail = 'Terraform';
+terraformStatus.command = {
+  command: 'terraform.commands',
+  title: 'Terraform Commands',
+  tooltip: 'foo',
+};
+
+export function setTerraformState(
+  detail: string,
+  busy: boolean,
+  severity: vscode.LanguageStatusSeverity = vscode.LanguageStatusSeverity.Information,
+) {
+  terraformStatus.busy = busy;
+  terraformStatus.detail = detail;
+  terraformStatus.severity = severity;
+}
+
+export function setTerraformVersion(version: string) {
+  terraformStatus.text = version;
+}

src/terraform.ts

@@ -1,6 +1,12 @@
+import * as tfStatus from './status/terraform';
 import TelemetryReporter from '@vscode/extension-telemetry';
 import * as vscode from 'vscode';
-import { ExecuteCommandParams, ExecuteCommandRequest, LanguageClient } from 'vscode-languageclient/node';
+import {
+  ExecuteCommandParams,
+  ExecuteCommandRequest,
+  LanguageClient,
+  WorkDoneProgress,
+} from 'vscode-languageclient/node';
 import { Utils } from 'vscode-uri';
 import { getActiveTextEditor } from './utils/vscode';
 import { clientSupportsCommand } from './utils/clientHelpers';
@@ -10,6 +16,12 @@ export interface ModuleCaller {
   uri: string;
 }
 
+export interface TerraformInfoResponse {
+  v: number;
+  required_version: string;
+  discovered_version: string;
+  discovered_path: string;
+}
 export interface ModuleCallersResponse {
   v: number;
   callers: ModuleCaller[];
@@ -44,6 +56,18 @@ interface ModuleProvidersResponse {
 }
 /* eslint-enable @typescript-eslint/naming-convention */
 
+export async function terraformVersion(
+  moduleUri: string,
+  client: LanguageClient,
+  reporter: TelemetryReporter,
+): Promise<TerraformInfoResponse> {
+  const command = 'terraform-ls.module.terraform';
+
+  const response = await execWorkspaceLSCommand<TerraformInfoResponse>(command, moduleUri, client, reporter);
+
+  return response;
+}
+
 export async function moduleCallers(
   moduleUri: string,
   client: LanguageClient,