Added simplistic commit message template

README.md

@@ -121,6 +121,26 @@ This is the annotated commit message associated with the tag. By default, a chan
     tag_message: "Custom message goes here."
 ```
 
+#### commit_message_template
+
+By default, a changelog is generated, containing the commit messages since the last release. The message is generated by applying a commit message template to each commit's data attributes.
+
+```yaml
+- uses: butlerlogic/action-autotag@1.0.0
+  with:
+    GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+    commit_message_template: "({{sha}} by {{author}}) {{message}}"
+```
+
+Optional data points:
+
+1. `number` The commit number (relevant to the overall list)
+1. `message` The commit message.
+1. `author` The author of the commit.
+1. `sha` The SHA value representing the commit.
+
+The default is `{{number}}) {{message}} ({{author}})\nSHA: {{sha}}\n`.
+
 #### version
 
 Explicitly set the version instead of using automatic detection.

action.yml

@@ -25,6 +25,9 @@ inputs:
   tag_message:
     description: This is the annotated commit message associated with the tag. By default, a changelog will be generated from the commits between the latest tag and the new tag (HEAD). This will override that with a hard-coded message.
     required: false
+  commit_message_template:
+    description: "The commit message template (per commit). Default is `{{number}}) {{message}} ({{author}})\nSHA: {{sha}}\n`"
+    required: false
   version:
     description: Explicitly set the version here instead of automatically detecting from `package.json`. Useful for non-JavaScript projects where version may be output by a previous action.
     required: false

app/lib/tag.js

@@ -55,18 +55,28 @@ export default class Tag {
       }
 
       const changelog = await github.repos.compareCommits({ owner, repo, base: tags.shift().name, head: 'master' })
+      const tpl = (core.getInput('commit_message_template', { required: false }) || '').trim()
 
       return changelog.data.commits
         .map(
-          (commit, i) =>
-            `${i === 0 ? '\n' : ''}${i + 1}) ${commit.commit.message}${
-              commit.hasOwnProperty('author')
-                ? commit.author.hasOwnProperty('login')
-                  ? ' (' + commit.author.login + ')'
+          (commit, i) => {
+            if (tpl.length > 0) {
+              return tpl
+                .replace(/\{\{\s?(number)\s?\}\}/gi, i + 1)
+                .replace(/\{\{\s?(message)\s?\}\}/gi, commit.commit.message)
+                .replace(/\{\{\s?(author)\s?\}\}/gi, commit.hasOwnProperty('author') ? (commit.author.hasOwnProperty('login') ? commit.author.login : '') : '')
+                .replace(/\{\{\s?(sha)\s?\}\}/gi, commit.sha)
+                .trim() + '\n'
+            } else {
+              return `${i === 0 ? '\n' : ''}${i + 1}) ${commit.commit.message}${
+                commit.hasOwnProperty('author')
+                  ? commit.author.hasOwnProperty('login')
+                    ? ' (' + commit.author.login + ')'
+                    : ''
                   : ''
-                : ''
-            }\n(SHA: ${commit.sha})\n`
-        )
+              }\n(SHA: ${commit.sha})\n`
+            }
+          })
         .join('\n')
     } catch (e) {
       core.warning('Failed to generate changelog from commits: ' + e.message + os.EOL)