Extract cache-reporting into separate file

Cache reporting is self-contained enough that it deserves some separation.

src/caches.ts

@@ -1,8 +1,8 @@
+import * as core from '@actions/core'
 import {GradleUserHomeCache} from './cache-gradle-user-home'
 import {ProjectDotGradleCache} from './cache-project-dot-gradle'
-import * as core from '@actions/core'
 import {isCacheDisabled, isCacheReadOnly} from './cache-utils'
-import {CacheEntryListener, CacheListener} from './cache-base'
+import {logCachingReport, CacheListener} from './cache-reporting'
 
 const BUILD_ROOT_DIR = 'BUILD_ROOT_DIR'
 const CACHE_LISTENER = 'CACHE_LISTENER'
@@ -56,47 +56,3 @@ export async function save(): Promise<void> {
 
     logCachingReport(cacheListener)
 }
-
-function logCachingReport(listener: CacheListener): void {
-    if (listener.cacheEntries.length === 0) {
-        return
-    }
-
-    core.info(`---------- Caching Summary -------------
-Restored Entries Count: ${getCount(listener.cacheEntries, e => e.restoredSize)}
-                  Size: ${getSum(listener.cacheEntries, e => e.restoredSize)}
-Saved Entries    Count: ${getCount(listener.cacheEntries, e => e.savedSize)}
-                  Size: ${getSum(listener.cacheEntries, e => e.savedSize)}`)
-
-    core.startGroup('Cache Entry details')
-    for (const entry of listener.cacheEntries) {
-        core.info(`Entry: ${entry.entryName}
-    Requested Key : ${entry.requestedKey ?? ''}
-    Restored  Key : ${entry.restoredKey ?? ''}
-              Size: ${formatSize(entry.restoredSize)}
-    Saved     Key : ${entry.savedKey ?? ''}
-              Size: ${formatSize(entry.savedSize)}`)
-    }
-    core.endGroup()
-}
-
-function getCount(
-    cacheEntries: CacheEntryListener[],
-    predicate: (value: CacheEntryListener) => number | undefined
-): number {
-    return cacheEntries.filter(e => predicate(e) !== undefined).length
-}
-
-function getSum(
-    cacheEntries: CacheEntryListener[],
-    predicate: (value: CacheEntryListener) => number | undefined
-): string {
-    return formatSize(cacheEntries.map(e => predicate(e) ?? 0).reduce((p, v) => p + v, 0))
-}
-
-function formatSize(bytes: number | undefined): string {
-    if (bytes === undefined || bytes === 0) {
-        return ''
-    }
-    return `${Math.round(bytes / (1024 * 1024))} MB (${bytes} B)`
-}