src/goToolsInformation: require go1.13+ for gopls

Gopls v0.8.0+ will require go1.13+ for build.

And, skip gopls shouldUpdateLanguageServer check.

Fixes #2030

Change-Id: If8fdc14553337c4a9bb3f8caae15ace2aa60e0eb
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/381214
Trust: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>

src/goLanguageServer.ts

@@ -1072,6 +1072,12 @@ export async function shouldUpdateLanguageServer(
 		return null;
 	}
 
+	// If the Go version is too old, don't update.
+	const goVersion = await getGoVersion();
+	if (!goVersion || (tool.minimumGoVersion && goVersion.lt(tool.minimumGoVersion.format()))) {
+		return null;
+	}
+
 	// First, run the "gopls version" command and parse its results.
 	// TODO(rstambler): Confirm that the gopls binary's modtime matches the
 	// modtime in the config. Update it if needed.

src/goToolsInformation.ts

@@ -202,7 +202,7 @@ export const allToolsInformation: { [key: string]: Tool } = {
 		isImportant: true,
 		description: 'Language Server from Google',
 		usePrereleaseInPreviewMode: true,
-		minimumGoVersion: semver.coerce('1.12'),
+		minimumGoVersion: semver.coerce('1.13'),
 		latestVersion: semver.parse('v0.7.5'),
 		latestVersionTimestamp: moment('2022-01-18', 'YYYY-MM-DD'),
 		latestPrereleaseVersion: semver.parse('v0.7.5'),

test/testdata/helloWorldServer/go.mod

@@ -1,3 +1,3 @@
 module hello-world
 
-go 1.12
+go 1.13

tools/allTools.ts.in

@@ -200,7 +200,7 @@ export const allToolsInformation: { [key: string]: Tool } = {
 		isImportant: true,
 		description: 'Language Server from Google',
 		usePrereleaseInPreviewMode: true,
-		minimumGoVersion: semver.coerce('1.12'),
+		minimumGoVersion: semver.coerce('1.13'),
 		latestVersion: semver.parse('%s'),
 		latestVersionTimestamp: moment('%s', 'YYYY-MM-DD'),
 		latestPrereleaseVersion: semver.parse('%s'),