Allow global prefix/suffix on latest

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

src/flavor.ts

@@ -1,41 +1,71 @@
 import * as core from '@actions/core';
+import csvparse from 'csv-parse/lib/sync';
 
 export interface Flavor {
   latest: string;
   prefix: string;
+  prefixLatest: boolean;
   suffix: string;
+  suffixLatest: boolean;
 }
 
 export function Transform(inputs: string[]): Flavor {
   const flavor: Flavor = {
     latest: 'auto',
     prefix: '',
-    suffix: ''
+    prefixLatest: false,
+    suffix: '',
+    suffixLatest: false
   };
 
   for (const input of inputs) {
-    const parts = input.split('=', 2);
-    if (parts.length == 1) {
-      throw new Error(`Invalid entry: ${input}`);
-    }
-    switch (parts[0]) {
-      case 'latest': {
-        flavor.latest = parts[1];
-        if (!['auto', 'true', 'false'].includes(flavor.latest)) {
-          throw new Error(`Invalid latest flavor entry: ${input}`);
+    const fields = csvparse(input, {
+      relaxColumnCount: true,
+      skipLinesWithEmptyValues: true
+    })[0];
+    let onlatestfor = '';
+    for (const field of fields) {
+      const parts = field.toString().split('=', 2);
+      if (parts.length == 1) {
+        throw new Error(`Invalid flavor entry: ${input}`);
+      }
+      switch (parts[0]) {
+        case 'latest': {
+          flavor.latest = parts[1];
+          if (!['auto', 'true', 'false'].includes(flavor.latest)) {
+            throw new Error(`Invalid latest flavor entry: ${input}`);
+          }
+          break;
+        }
+        case 'prefix': {
+          flavor.prefix = parts[1];
+          onlatestfor = 'prefix';
+          break;
+        }
+        case 'suffix': {
+          flavor.suffix = parts[1];
+          onlatestfor = 'suffix';
+          break;
+        }
+        case 'onlatest': {
+          if (!['true', 'false'].includes(parts[1])) {
+            throw new Error(`Invalid value for onlatest attribute: ${parts[1]}`);
+          }
+          switch (onlatestfor) {
+            case 'prefix': {
+              flavor.prefixLatest = /true/i.test(parts[1]);
+              break;
+            }
+            case 'suffix': {
+              flavor.suffixLatest = /true/i.test(parts[1]);
+              break;
+            }
+          }
+          break;
+        }
+        default: {
+          throw new Error(`Unknown flavor entry: ${input}`);
         }
-        break;
-      }
-      case 'prefix': {
-        flavor.prefix = parts[1];
-        break;
-      }
-      case 'suffix': {
-        flavor.suffix = parts[1];
-        break;
-      }
-      default: {
-        throw new Error(`Unknown entry: ${input}`);
       }
     }
   }
@@ -43,7 +73,9 @@ export function Transform(inputs: string[]): Flavor {
   core.startGroup(`Processing flavor input`);
   core.info(`latest=${flavor.latest}`);
   core.info(`prefix=${flavor.prefix}`);
+  core.info(`prefixLatest=${flavor.prefixLatest}`);
   core.info(`suffix=${flavor.suffix}`);
+  core.info(`suffixLatest=${flavor.suffixLatest}`);
   core.endGroup();
 
   return flavor;

src/meta.ts

@@ -159,7 +159,6 @@ export class Meta {
       vraw = this.context.ref.replace(/^refs\/tags\//g, '').replace(/\//g, '-');
     }
 
-    let latest: boolean = false;
     let tmatch;
     const isRegEx = tag.attrs['pattern'].match(/^\/(.+)\/(.*)$/);
     if (isRegEx) {
@@ -304,7 +303,7 @@ export class Meta {
         tags.push(`${imageLc}:${partial}`);
       }
       if (this.version.latest) {
-        tags.push(`${imageLc}:latest`);
+        tags.push(`${imageLc}:${this.flavor.prefixLatest ? this.flavor.prefix : ''}latest${this.flavor.suffixLatest ? this.flavor.suffix : ''}`);
       }
     }
     return tags;

src/tag.ts

@@ -100,7 +100,7 @@ export function Parse(s: string): Tag {
       switch (key) {
         case 'type': {
           if (!Object.values(Type).includes(value)) {
-            throw new Error(`Unknown type attribute: ${value}`);
+            throw new Error(`Unknown tag type attribute: ${value}`);
           }
           tag.type = value;
           break;