Fix #144: include <tool> in 'Resolved' info (#145)

Fix #144: Instead of just printing e.g. `Resolved latest to 2.9.3`, print `Resolved stack latest to 2.9.3`.

E.g.: https://github.com/haskell/actions/actions/runs/3757986267/jobs/6385794767#step:3:7
```
Preparing to setup a Haskell environment
Resolved latest to 9.4.2
Resolved latest to 3.8.1.0
```

With this PR: https://github.com/haskell/actions/actions/runs/3794946311/jobs/6453551975#step:3:7
```
Preparing to setup a Haskell environment
Resolved ghc latest to 9.4.2
Resolved cabal latest to 3.8.1.0
```

setup/src/opts.ts

@@ -44,7 +44,7 @@ export const yamlInputs: Record<string, {default: string}> = (
 
 export function getDefaults(os: OS): Defaults {
   const mkVersion = (v: string, vs: string[], t: Tool): Version => ({
-    version: resolve(yamlInputs[v].default, vs, t, os),
+    version: resolve(yamlInputs[v].default, vs, t, os, false), // verbose=false: no printout here
     supported: vs
   });
 
@@ -56,20 +56,25 @@ export function getDefaults(os: OS): Defaults {
   };
 }
 
+// E.g. resolve ghc latest to 9.4.2
 function resolve(
   version: string,
   supported: string[],
   tool: Tool,
-  os: OS
+  os: OS,
+  verbose: boolean // If resolution isn't the identity, print what resolved to what.
 ): string {
   const resolved =
     version === 'latest'
       ? supported[0]
       : supported.find(v => v.startsWith(version)) ?? version;
-  return (
+  const result =
     release_revisions?.[os]?.[tool]?.find(({from}) => from === resolved)?.to ??
-    resolved
-  );
+    resolved;
+  // Andreas 2022-12-29, issue #144: inform about resolution here where we can also output ${tool}.
+  if (verbose === true && version !== result)
+    core.info(`Resolved ${tool} ${version} to ${result}`);
+  return result;
 }
 
 export function getOpts(
@@ -102,31 +107,46 @@ export function getOpts(
     throw new Error(errors.join('\n'));
   }
 
+  const ghcEnable = !stackNoGlobal;
+  const cabalEnable = !stackNoGlobal;
   const opts: Options = {
     ghc: {
       raw: verInpt.ghc,
-      resolved: resolve(verInpt.ghc, ghc.supported, 'ghc', os),
-      enable: !stackNoGlobal
+      resolved: resolve(
+        verInpt.ghc,
+        ghc.supported,
+        'ghc',
+        os,
+        ghcEnable // if true: inform user about resolution
+      ),
+      enable: ghcEnable
     },
     cabal: {
       raw: verInpt.cabal,
-      resolved: resolve(verInpt.cabal, cabal.supported, 'cabal', os),
-      enable: !stackNoGlobal
+      resolved: resolve(
+        verInpt.cabal,
+        cabal.supported,
+        'cabal',
+        os,
+        cabalEnable // if true: inform user about resolution
+      ),
+      enable: cabalEnable
     },
     stack: {
       raw: verInpt.stack,
-      resolved: resolve(verInpt.stack, stack.supported, 'stack', os),
+      resolved: resolve(
+        verInpt.stack,
+        stack.supported,
+        'stack',
+        os,
+        stackEnable // if true: inform user about resolution
+      ),
       enable: stackEnable,
       setup: stackSetupGhc
     },
     general: {matcher: {enable: !matcherDisable}}
   };
 
-  // eslint-disable-next-line github/array-foreach
-  Object.values(opts)
-    .filter(t => t.enable && t.raw !== t.resolved)
-    .forEach(t => core.info(`Resolved ${t.raw} to ${t.resolved}`));
-
   core.debug(`Options are: ${JSON.stringify(opts)}`);
   return opts;
 }