Make Anchor version fallback depend on Solana version

Author: lorisleiva

utils/renderContext.ts

@@ -57,12 +57,15 @@ export function getRenderContext({
   const repositoryUrl = `https://github.com/${inputs.organizationName}/${inputs.targetDirectoryName}`;
 
   // Versions.
-  const anchorVersion = resolveAnchorVersion(anchorVersionDetected);
   const solanaVersion = resolveSolanaVersion(
     language,
     inputs.solanaVersion,
     solanaVersionDetected
   );
+  const anchorVersion = resolveAnchorVersion(
+    anchorVersionDetected,
+    solanaVersion
+  );
   const rustVersion = resolveRustVersion(
     language,
     solanaVersion,

utils/versionAnchor.ts

@@ -5,10 +5,9 @@ import {
   getVersionFromStdout,
   ResolvedVersion,
   Version,
+  VersionWithoutPatch,
 } from './versionCore';
 
-export const FALLBACK_ANCHOR_VERSION: Version = '0.30.0';
-
 export async function detectAnchorVersion(
   language: Language
 ): Promise<Version> {
@@ -22,10 +21,20 @@ export async function detectAnchorVersion(
 }
 
 export function resolveAnchorVersion(
-  detectedVersion: Version | undefined
+  detectedVersion: Version | undefined,
+  solanaVersion: ResolvedVersion
 ): ResolvedVersion | undefined {
+  const fallbackVersionMap: Record<VersionWithoutPatch, Version> = {
+    '1.17': '0.29.0',
+    '1.18': '0.30.0',
+    '2.0': '0.30.0',
+    '2.1': '0.31.0',
+    '2.2': '0.31.0',
+  };
+  const fallbackVersion: Version =
+    fallbackVersionMap[solanaVersion.withoutPatch] ?? '0.30.0';
   const [full, withoutPatch] = getVersionAndVersionWithoutPatch(
-    detectedVersion ?? FALLBACK_ANCHOR_VERSION
+    detectedVersion ?? fallbackVersion
   );
   return { full, withoutPatch, detected: detectedVersion };
 }