- introduce new additional placeholders useable for building the changelog

| **Placeholder**            | **Description**                                                                                    | **Empty** |
|----------------------------|----------------------------------------------------------------------------------------------------|:---------:|
| `${{CHANGED_FILES}}`       | The count of changed files.                                                                        |           |
| `${{ADDITIONS}}`           | The count of code additions (lines).                                                               |           |
| `${{DELETIONS}}`           | The count of code deletions (lines).                                                               |           |
| `${{CHANGES}}`             | The count of total changes (lines).                                                                |           |
| `${{COMMITS}}`             | The count of commits in this release.                                                              |           |

- restructure project to return additional diff related information along the individual commits
- update testcases to verify functionality of new placeholders

src/transform.ts

@@ -7,8 +7,10 @@ import {
 } from './configuration'
 import {PullRequestInfo, sortPullRequests} from './pullRequests'
 import {ReleaseNotesOptions} from './releaseNotes'
+import {DiffInfo} from './commits'
 
 export function buildChangelog(
+  diffInfo: DiffInfo,
   prs: PullRequestInfo[],
   options: ReleaseNotesOptions
 ): string {
@@ -272,6 +274,27 @@ export function buildChangelog(
     /\${{IGNORED_COUNT}}/g,
     ignoredPrs.length.toString()
   )
+  // code change placeholders
+  transformedChangelog = transformedChangelog.replace(
+    /\${{CHANGED_FILES}}/g,
+    diffInfo.changedFiles.toString()
+  )
+  transformedChangelog = transformedChangelog.replace(
+    /\${{ADDITIONS}}/g,
+    diffInfo.additions.toString()
+  )
+  transformedChangelog = transformedChangelog.replace(
+    /\${{DELETIONS}}/g,
+    diffInfo.deletions.toString()
+  )
+  transformedChangelog = transformedChangelog.replace(
+    /\${{CHANGES}}/g,
+    diffInfo.changes.toString()
+  )
+  transformedChangelog = transformedChangelog.replace(
+    /\${{COMMITS}}/g,
+    diffInfo.commits.toString()
+  )
   transformedChangelog = fillAdditionalPlaceholders(
     transformedChangelog,
     options
@@ -286,6 +309,7 @@ export function fillAdditionalPlaceholders(
   options: ReleaseNotesOptions
 ): string {
   let transformed = text
+  // repository placeholders
   transformed = transformed.replace(/\${{OWNER}}/g, options.owner)
   transformed = transformed.replace(/\${{REPO}}/g, options.repo)
   transformed = transformed.replace(/\${{FROM_TAG}}/g, options.fromTag)