Improve debugging

README.md

@@ -39,6 +39,7 @@ ___
 * [Notes](#notes)
   * [Latest tag](#latest-tag)
   * [Overwrite labels](#overwrite-labels)
+  * [Debug](#debug)
 * [Keep up-to-date with GitHub Dependabot](#keep-up-to-date-with-github-dependabot)
 * [Contributing](#contributing)
 * [License](#license)
@@ -573,6 +574,10 @@ labels generated are not suitable, you can overwrite them like this:
             org.opencontainers.image.vendor=MyCompany
 ```
 
+### Debug
+
+For more details, please enable debug logs by [adding secret `ACTIONS_STEP_DEBUG=true`](https://docs.github.com/en/actions/managing-workflow-runs/enabling-debug-logging#enabling-step-debug-logging).
+
 ## Keep up-to-date with GitHub Dependabot
 
 Since [Dependabot](https://docs.github.com/en/github/administering-a-repository/keeping-your-actions-up-to-date-with-github-dependabot)

src/flavor.ts

@@ -1,3 +1,5 @@
+import * as core from '@actions/core';
+
 export interface Flavor {
   latest: string;
   prefix: string;
@@ -38,5 +40,11 @@ export function Transform(inputs: string[]): Flavor {
     }
   }
 
+  if (core.isDebug()) {
+    core.startGroup(`Parsing flavor input`);
+    core.debug([`latest=${flavor.latest}`, `prefix=${flavor.prefix}`, `suffix=${flavor.suffix}`].join(','));
+    core.endGroup();
+  }
+
   return flavor;
 }

src/tag.ts

@@ -1,4 +1,5 @@
 import csvparse from 'csv-parse/lib/sync';
+import * as core from '@actions/core';
 
 export enum Type {
   Schedule = 'schedule',
@@ -16,9 +17,21 @@ export enum RefEvent {
   PR = 'pr'
 }
 
-export interface Tag {
-  type: Type;
-  attrs: Record<string, string>;
+export class Tag {
+  public type?: Type;
+  public attrs: Record<string, string>;
+
+  constructor() {
+    this.attrs = {};
+  }
+
+  public toString(): string {
+    const out: string[] = [`type=${this.type}`];
+    for (let attr in this.attrs) {
+      out.push(`${attr}=${this.attrs[attr]}`);
+    }
+    return out.join(',');
+  }
 }
 
 export const DefaultPriorities: Record<Type, string> = {
@@ -42,10 +55,11 @@ export function Transform(inputs: string[]): Tag[] {
       `type=ref,event=${RefEvent.PR}`
     ];
   }
+
   for (const input of inputs) {
     tags.push(Parse(input));
   }
-  return tags.sort((tag1, tag2) => {
+  const sorted = tags.sort((tag1, tag2) => {
     if (Number(tag1.attrs['priority']) < Number(tag2.attrs['priority'])) {
       return 1;
     }
@@ -54,6 +68,16 @@ export function Transform(inputs: string[]): Tag[] {
     }
     return 0;
   });
+
+  if (core.isDebug()) {
+    core.startGroup(`Parsing tags input`);
+    for (const tag of sorted) {
+      core.debug(tag.toString());
+    }
+    core.endGroup();
+  }
+
+  return sorted;
 }
 
 export function Parse(s: string): Tag {
@@ -62,10 +86,7 @@ export function Parse(s: string): Tag {
     skipLinesWithEmptyValues: true
   })[0];
 
-  const tag = {
-    attrs: {}
-  } as Tag;
-
+  const tag = new Tag();
   for (const field of fields) {
     const parts = field.toString().split('=', 2);
     if (parts.length == 1) {