Add fallback tag support

.github/workflows/ci.yml

@@ -22,3 +22,11 @@ jobs:
         uses: ./
       - run: |
           echo "${{ steps.previoustag.outputs.tag }}"
+      - run: rm .git/refs/tags -Rfv
+      - name: 'Get Previous tag with fallback'
+        id: previoustagwithfallback
+        uses: ./
+        with:
+          fallback: v1.0.0
+      - run: |
+          echo "${{ steps.previoustagwithfallback.outputs.tag }}"

README.md

@@ -32,6 +32,8 @@ jobs:
       - name: 'Get Previous tag'
         id: previoustag
         uses: "WyriHaximus/github-action-get-previous-tag@v1"
+        with:
+          fallback: 1.0.0 # Optional fallback tag to use when no tag can be found
       - name: 'Get next minor version'
         id: semvers
         uses: "WyriHaximus/github-action-next-semvers@v1"

action.yml

@@ -3,6 +3,10 @@ description: 'Get the latest tag from git and outputs that for use in other acti
 branding:
   icon: 'tag'
   color: 'gray-dark'
+inputs:
+  fallback:
+    description: 'Fallback tag to use when no previous tag can be found'
+    required: false
 outputs:
   tag:
     description: 'Latest tag'

main.js

@@ -12,6 +12,15 @@ exec('git rev-list --tags --max-count=1', (err, rev, stderr) => {
         if (err) {
             console.log('\x1b[33m%s\x1b[0m', 'Could not find any tags because: ');
             console.log('\x1b[31m%s\x1b[0m', stderr);
+            if (process.env.INPUT_FALLBACK) {
+                let timestamp = Math.floor(new Date().getTime() / 1000);
+                console.log('\x1b[33m%s\x1b[0m', 'Falling back to default tag');
+                console.log('\x1b[32m%s\x1b[0m', `Found tag: ${process.env.INPUT_FALLBACK}`);
+                console.log('\x1b[32m%s\x1b[0m', `Found timestamp: ${timestamp}`);
+                console.log(`::set-output name=tag::${process.env.INPUT_FALLBACK}`);
+                console.log(`::set-output name=timestamp::${timestamp}`);
+                process.exit(0);
+            }
             process.exit(1);
         }