Add versionPrefix to allow setting the version prefix to compare tags

CHANGELOG.md

@@ -3,7 +3,8 @@
 ## [Unreleased]
 
 ### Added
-- Add `--no-empty-sections` flag to `getChangelog` task. [#167](../../issues/167)
+- `versionPrefix` to allow setting the version prefix to compare tags [#139](../../issues/139)
+- `--no-empty-sections` flag to `getChangelog` task [#167](../../issues/167)
 
 ### Fixed
 - No-longer discard all but the last paragraph in list items [#133](../../issues/133) [#147](../../issues/147)

README.md

@@ -160,6 +160,7 @@ Plugin can be configured with the following properties set in the `changelog {}`
 
 | Property                | Type                           | Default value                                                        | Description                                                                                                      |
 |-------------------------|--------------------------------|----------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------|
+| `versionPrefix`         | `String`                       | `v`                                                                  | Version prefix used to compare tags.                                                                             |
 | `version`               | `String`                       | `project.version`                                                    | Current version. By default, project's version is used.                                                          |
 | `path`                  | `String`                       | `file("CHANGELOG.md").cannonicalPath`                                | Path to the changelog file.                                                                                      |
 | `preTitle`              | `String?`                      | `null`                                                               | Optional content placed before the `title`.                                                                      |

src/main/kotlin/org/jetbrains/changelog/ChangelogPlugin.kt

@@ -43,6 +43,8 @@ class ChangelogPlugin : Plugin<Project> {
                     toAbsolutePath().toString()
                 }
             })
+            versionPrefix.convention(project.provider { "v" })
+
             version.convention(
                 project.provider {
                     project.version.toString().takeIf { it != Project.DEFAULT_VERSION }
@@ -78,15 +80,16 @@ class ChangelogPlugin : Plugin<Project> {
             repositoryUrl.map { it.removeSuffix("/") }
             sectionUrlBuilder.convention(
                 ChangelogSectionUrlBuilder { repositoryUrl, currentVersion, previousVersion, isUnreleased ->
+                    val prefix = versionPrefix.get()
                     repositoryUrl + when {
                         isUnreleased -> when (previousVersion) {
                             null -> "/commits"
-                            else -> "/compare/v$previousVersion...HEAD"
+                            else -> "/compare/$prefix$previousVersion...HEAD"
                         }
 
-                        previousVersion == null -> "/commits/v$currentVersion"
+                        previousVersion == null -> "/commits/$prefix$currentVersion"
 
-                        else -> "/compare/v$previousVersion...v$currentVersion"
+                        else -> "/compare/$prefix$previousVersion...$prefix$currentVersion"
                     }
                 }
             )

src/main/kotlin/org/jetbrains/changelog/ChangelogPluginExtension.kt

@@ -13,6 +13,14 @@ import java.util.regex.Pattern
 
 abstract class ChangelogPluginExtension {
 
+    /**
+     * Version prefix used to compare tags.
+     *
+     * Default value: `v`
+     */
+    @get:Optional
+    abstract val versionPrefix: Property<String>
+
     /**
      * Current version. By default, project's version is used.
      *

src/test/kotlin/org/jetbrains/changelog/tasks/PatchChangelogTaskTest.kt

@@ -117,6 +117,45 @@ class PatchChangelogTaskTest : BaseTest() {
         }
     }
 
+    @Test
+    fun `patches Unreleased version with custom version prefix to the current one`() {
+        buildFile =
+            """
+            plugins {
+                id 'org.jetbrains.changelog'
+            }
+            changelog {
+                versionPrefix = "w"
+                version = "$version"
+                keepUnreleasedSection = false
+                repositoryUrl = "https://github.com/JetBrains/gradle-changelog-plugin"
+            }
+            """.trimIndent()
+
+        project.evaluate()
+        runTask(PATCH_CHANGELOG_TASK_NAME)
+
+        assertMarkdown(
+            """
+            ## [1.0.0] - $date
+            Fancy release.
+
+            ### Added
+            - foo
+
+            [1.0.0]: https://github.com/JetBrains/gradle-changelog-plugin/commits/w1.0.0
+
+            """.trimIndent(),
+            extension.renderItem(extension.get(version))
+        )
+
+        assertFailsWith<MissingVersionException> {
+            extension.getUnreleased().also {
+                println("it = ${it}")
+            }
+        }
+    }
+
     @Test
     fun `applies custom header patcher`() {
         buildFile =