- split logic to validate and read in additional details for changelog generation into new releaseNotesBuilder

- construct main class to be as simple as possible

src/main.ts

@@ -1,15 +1,7 @@
 import * as core from '@actions/core'
-import {
-  failOrError,
-  retrieveRepositoryPath,
-  resolveConfiguration
-} from './utils'
-import {ReleaseNotes} from './releaseNotes'
-import {createCommandManager} from './gitHelper'
+import {retrieveRepositoryPath, resolveConfiguration} from './utils'
 import * as github from '@actions/github'
-import {DefaultConfiguration} from './configuration'
-import {Octokit} from '@octokit/rest'
-import {Tags} from './tags'
+import {ReleaseNotesBuilder} from './releaseNotesBuilder'
 
 async function run(): Promise<void> {
   core.setOutput('failed', false) // mark the action not failed by default
@@ -32,102 +24,25 @@ async function run(): Promise<void> {
     const owner = core.getInput('owner') || github.context.repo.owner
     const repo = core.getInput('repo') || github.context.repo.repo
     // read in from, to tag inputs
-    let fromTag = core.getInput('fromTag')
-    let toTag = core.getInput('toTag')
+    const fromTag = core.getInput('fromTag')
+    const toTag = core.getInput('toTag')
     // read in flags
     const ignorePreReleases = core.getInput('ignorePreReleases') === 'true'
     const failOnError = core.getInput('failOnError') === 'true'
 
-    // ensure to resolve the toTag if it was not provided
-    if (!toTag) {
-      // if not specified try to retrieve tag from github.context.ref
-      if (github.context.ref.startsWith('refs/tags/')) {
-        toTag = github.context.ref.replace('refs/tags/', '')
-        core.info(
-          `🔖 Resolved current tag (${toTag}) from the 'github.context.ref'`
-        )
-      } else {
-        // if not specified try to retrieve tag from git
-        const gitHelper = await createCommandManager(repositoryPath)
-        const latestTag = await gitHelper.latestTag()
-        toTag = latestTag
-        core.info(
-          `🔖 Resolved current tag (${toTag}) from 'git rev-list --tags --skip=0 --max-count=1'`
-        )
-      }
-    }
-
-    if (!owner) {
-      failOrError(`💥 Missing or couldn't resolve 'owner'`, failOnError)
-      return
-    } else {
-      core.setOutput('owner', owner)
-      core.debug(`Resolved 'owner' as ${owner}`)
-    }
-
-    if (!repo) {
-      failOrError(`💥 Missing or couldn't resolve 'owner'`, failOnError)
-      return
-    } else {
-      core.setOutput('repo', repo)
-      core.debug(`Resolved 'repo' as ${repo}`)
-    }
-
-    if (!toTag) {
-      failOrError(`💥 Missing or couldn't resolve 'toTag'`, failOnError)
-      return
-    } else {
-      core.setOutput('toTag', toTag)
-      core.debug(`Resolved 'toTag' as ${toTag}`)
-    }
-    core.endGroup()
-
-    // load octokit instance
-    const octokit = new Octokit({
-      auth: `token ${token || process.env.GITHUB_TOKEN}`
-    })
-
-    // ensure to resolve the fromTag if it was not provided specifically
-    if (!fromTag) {
-      core.startGroup(`🔖 Resolve previous tag`)
-      core.debug(`fromTag undefined, trying to resolve via API`)
-      const tagsApi = new Tags(octokit)
-
-      const previousTag = await tagsApi.findPredecessorTag(
-        owner,
-        repo,
-        toTag,
-        ignorePreReleases,
-        configuration.max_tags_to_fetch ||
-          DefaultConfiguration.max_tags_to_fetch
-      )
-      if (previousTag == null) {
-        failOrError(
-          `💥 Unable to retrieve previous tag given ${toTag}`,
-          failOnError
-        )
-        return
-      }
-      fromTag = previousTag.name
-      core.debug(`fromTag resolved via previousTag as: ${previousTag.name}`)
-      core.endGroup()
-    }
-
-    const releaseNotes = new ReleaseNotes(octokit, {
+    const result = await new ReleaseNotesBuilder(
+      token,
+      repositoryPath,
       owner,
       repo,
       fromTag,
       toTag,
       failOnError,
+      ignorePreReleases,
       configuration
-    })
+    ).build()
 
-    core.setOutput(
-      'changelog',
-      (await releaseNotes.pull()) ||
-        configuration.empty_template ||
-        DefaultConfiguration.empty_template
-    )
+    core.setOutput('changelog', result)
   } catch (error) {
     core.setFailed(error.message)
   }