From b3708ba54c1cece8e5ee8e21270fb934e97ecdf6 Mon Sep 17 00:00:00 2001
From: Andres Almiray <aalmiray@gmail.com>
Date: Tue, 6 Apr 2021 18:47:36 +0200
Subject: [PATCH] Resolve latest JReleaser release

---
 README.adoc        |  2 +-
 action.yml         |  2 +-
 get_jreleaser.java | 85 ++++++++++++++++++++++++++++++++--------------
 3 files changed, 61 insertions(+), 28 deletions(-)

diff --git a/README.adoc b/README.adoc
index c26778a..9919d7d 100644
--- a/README.adoc
+++ b/README.adoc
@@ -89,7 +89,7 @@ Following inputs can be used as `step.with` keys
 [%header,cols="<2,<,<2,<3",width="100%"]
 |===
 | Name              | Type   | Default                 | Description
-| version           | String | early-access            | The JReleaser version to use. +
+| version           | String | latest                  | The JReleaser version to use. +
 Should match any of the link:https://github.com/jreleaser/jreleaser/releases[published releases].
 | arguments         | String | full-release            | The JReleaser command to run.
 | working-directory | String | ${{ github.workspace }} | The directory to change into. +
diff --git a/action.yml b/action.yml
index 19c020f..83ae787 100644
--- a/action.yml
+++ b/action.yml
@@ -10,7 +10,7 @@ inputs:
 
   version:
     description: 'The version of JReleaser to download and execute.'
-    default: 'early-access'
+    default: 'latest'
     required: true
 
   arguments:
diff --git a/get_jreleaser.java b/get_jreleaser.java
index b78a363..eb19e5f 100644
--- a/get_jreleaser.java
+++ b/get_jreleaser.java
@@ -6,31 +6,64 @@ import java.nio.file.Path;
 import java.nio.file.StandardCopyOption;
 
 class get_jreleaser {
-  public static void main(String... args) throws Exception {
-    if (args.length != 1) {
-      System.err.println("Usage: java get_jreleaser.java VERSION");
-      System.exit(1);
+    public static void main(String... args) throws Exception {
+        // default version
+        var version = "latest";
+
+        if (args.length > 1) {
+            System.err.println("Usage: java get_jreleaser.java [VERSION]");
+            System.exit(1);
+        }
+
+        // grab the version if specified
+        if (args.length == 1) {
+            version = args[0];
+        }
+
+        // check
+        if (null == version || version.isEmpty()) {
+            System.out.printf("❌ Version '%s' is invalid%n", version);
+            System.exit(1);
+        }
+
+        // resolve latest to a tagged release
+        if ("latest".equalsIgnoreCase(version)) {
+            var url = "https://jreleaser.org/releases/latest/download/VERSION";
+            var file = Path.of("VERSION");
+
+            try (var stream = new URL(url).openStream()) {
+                System.out.printf("✅ Located version marker%n");
+                Files.copy(stream, file, StandardCopyOption.REPLACE_EXISTING);
+                version = new String(Files.readAllBytes(file)).trim();
+                System.out.printf("✅ JReleaser latest resolves to %s%n", version);
+            } catch (FileNotFoundException e) {
+                System.out.printf("❌ JReleaser %s not found%n", version);
+                e.printStackTrace();
+                System.exit(1);
+            } catch (IOException e) {
+                System.out.printf("☠️  JReleaser %s could not be downloaded/copied%n", version);
+                e.printStackTrace();
+                System.exit(1);
+            }
+        }
+
+        // setup the actual download
+        var url = "https://github.com/jreleaser/jreleaser/releases/download/" + version + "/jreleaser-tool-provider-" + version + ".jar";
+        var file = Path.of("jreleaser-cli.jar");
+
+        try (var stream = new URL(url).openStream()) {
+            System.out.printf("✅ Located JReleaser %s%n", version);
+            System.out.printf("⬇️  Downloading %s%n", url);
+            var size = Files.copy(stream, file, StandardCopyOption.REPLACE_EXISTING);
+            System.out.printf("%s << copied %d bytes%n", file, size);
+            System.out.printf("✅ JReleaser installed successfully%n");
+        } catch (FileNotFoundException e) {
+            System.out.printf("❌ JReleaser %s not found%n", version);
+            System.exit(1);
+        } catch (IOException e) {
+            System.out.printf("☠️  JReleaser %s could not be downloaded/copied%n", version);
+            e.printStackTrace();
+            System.exit(1);
+        }
     }
-
-    // TODO: handle version = 'latest'
-
-    var version = args[0];
-    var url = "https://github.com/jreleaser/jreleaser/releases/download/" + version + "/jreleaser-tool-provider-" + version + ".jar";
-    var file = Path.of("jreleaser-cli.jar");
-
-    try (var stream = new URL(url).openStream()) {
-      System.out.printf("✅ Located JReleaser %s%n", version);
-      System.out.printf("⬇️  Downloading %s%n", url);
-      var size = Files.copy(stream, file, StandardCopyOption.REPLACE_EXISTING);
-      System.out.printf("%s << copied %d bytes%n", file, size);
-      System.out.printf("✅ JReleaser installed successfully%n");
-    } catch(FileNotFoundException e) {
-      System.out.printf("❌ JReleaser %s not found%n", version);
-      System.exit(1);
-    } catch(IOException e) {
-      System.out.printf("☠️  JReleaser %s could not be downloaded/copied%n", version);
-      e.printStackTrace();
-      System.exit(1);
-    }
-  }
 }