Fix wrong markdown render of changelog that use CRLF or CR line separator

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## [Unreleased]
 
+### Fixed
+- Wrong markdown render of changelog that use CRLF or CR line separator [#176](../../issues/176)
+
 ## [2.1.0] - 2023-06-02
 
 ### Added

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

@@ -101,7 +101,7 @@ class ChangelogPlugin : Plugin<Project> {
                             if (!exists()) {
                                 createNewFile()
                             }
-                            readText()
+                            readText().normalizeToLineFeed()
                         }
                     }.get(),
                     defaultPreTitle = preTitle.orNull,

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

@@ -39,6 +39,17 @@ internal fun String.reformat(lineSeparator: String): String {
     }
 }
 
+internal fun String.normalizeToLineFeed(): String {
+    val result = listOf(
+        "\r\n" to "\n",
+        "\r" to "\n",
+    ).fold(this) { acc, (pattern, replacement) ->
+        acc.replace(pattern, replacement)
+    }
+
+    return result
+}
+
 fun interface ChangelogSectionUrlBuilder {
     fun build(repositoryUrl: String, currentVersion: String?, previousVersion: String?, isUnreleased: Boolean): String
 }

src/test/kotlin/org/jetbrains/changelog/BaseTest.kt

@@ -36,7 +36,7 @@ open class BaseTest {
             field = value
             changelogFile.run {
                 createNewFile()
-                writeText(value.trimIndent().trim())
+                writeText(value)
             }
         }
         get() = changelogFile.readText()

src/test/kotlin/org/jetbrains/changelog/ExtensionsTest.kt

@@ -76,4 +76,45 @@ class ExtensionsTest {
             """.trimIndent().reformat(lineSeparator)
         )
     }
+
+    @Test
+    fun `normalize string to line feed`() {
+        val text = """
+            Pre title content.
+
+            # Title
+            Summary
+
+            ## [Unreleased]
+
+            ## [1.0.0]
+            - asd
+
+            ## [0.1.0]
+
+            ### Added
+            - Buz
+
+            """.trimIndent()
+
+        assertEquals(
+            text,
+            text.replace("\n", "\r\n").normalizeToLineFeed()
+        )
+
+        assertEquals(
+            text,
+            text.replace("\n", "\r").normalizeToLineFeed()
+        )
+
+        assertEquals(
+            text,
+            text.normalizeToLineFeed()
+        )
+
+        assertEquals(
+            "text\ntext2\ntext3\ntext4",
+            "text\ntext2\rtext3\r\ntext4".normalizeToLineFeed()
+        )
+    }
 }

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

@@ -95,6 +95,7 @@ class GetChangelogTaskTest : BaseTest() {
         )
     }
 
+    @Test
     fun `returns the Unreleased change notes without empty sections`() {
         val result = runTask(GET_CHANGELOG_TASK_NAME, "--quiet", "--unreleased", "--no-empty-sections")
 
@@ -261,4 +262,100 @@ class GetChangelogTaskTest : BaseTest() {
 
         assertTrue(result.output.contains("Reusing configuration cache."))
     }
+
+    @Test
+    fun `get changelog with CRLF line separator`() {
+        changelog =
+            """
+            # Changelog
+            ## [Unreleased]
+            Some unreleased changes.
+
+            - bar
+
+            ### Added
+
+            ### Fixed
+            - I fixed myself a beverage.
+
+            ## [1.0.1] - 2022-10-17
+            Release with bugfix.
+
+            ### Fixed
+            - bar
+
+            ## [1.0.0] - 2022-10-10
+            That was a great release.
+
+            ### Added
+            - foo
+
+            [Unreleased]: https://jetbrians.com/Unreleased
+            [1.0.1]: https://jetbrians.com/1.0.1
+            [1.0.0]: https://jetbrians.com/1.0.0
+            """.trimIndent().replace("\n", "\r\n")
+
+        val result = runTask(GET_CHANGELOG_TASK_NAME, "--quiet")
+
+        assertMarkdown(
+            """
+            ## [1.0.1] - 2022-10-17
+            Release with bugfix.
+
+            ### Fixed
+            - bar
+
+            [1.0.1]: https://jetbrians.com/1.0.1
+            """.trimIndent().replace("\n", "\r\n"),
+            result.output
+        )
+    }
+
+    @Test
+    fun `get changelog with CR line separator`() {
+        changelog =
+            """
+            # Changelog
+            ## [Unreleased]
+            Some unreleased changes.
+
+            - bar
+
+            ### Added
+
+            ### Fixed
+            - I fixed myself a beverage.
+
+            ## [1.0.1] - 2022-10-17
+            Release with bugfix.
+
+            ### Fixed
+            - bar
+
+            ## [1.0.0] - 2022-10-10
+            That was a great release.
+
+            ### Added
+            - foo
+
+            [Unreleased]: https://jetbrians.com/Unreleased
+            [1.0.1]: https://jetbrians.com/1.0.1
+            [1.0.0]: https://jetbrians.com/1.0.0
+            """.trimIndent().replace("\n", "\r")
+
+        val result = runTask(GET_CHANGELOG_TASK_NAME, "--quiet")
+
+        assertMarkdown(
+            """
+            ## [1.0.1] - 2022-10-17
+            Release with bugfix.
+
+            ### Fixed
+            - bar
+
+            [1.0.1]: https://jetbrians.com/1.0.1
+            """.trimIndent().replace("\n", "\r"),
+            result.output
+        )
+    }
 }

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

@@ -181,4 +181,102 @@ class InitializeChangelogTaskTest : BaseTest() {
 
         assertTrue(result.output.contains("Reusing configuration cache."))
     }
+
+    @Test
+    fun `creates new changelog file with CRLF line separator`() {
+        extension.lineSeparator.set("\r\n")
+
+        runTask(INITIALIZE_CHANGELOG_TASK_NAME)
+
+        assertMarkdown(
+            """
+            # Changelog
+
+            ## Unreleased
+
+            ### Added
+
+            ### Changed
+
+            ### Deprecated
+
+            ### Removed
+
+            ### Fixed
+
+            ### Security
+
+            """.trimIndent().replace("\n", "\r\n"),
+            extension.render()
+        )
+
+        assertMarkdown(
+            """
+            ## Unreleased
+
+            ### Added
+
+            ### Changed
+
+            ### Deprecated
+
+            ### Removed
+
+            ### Fixed
+
+            ### Security
+
+            """.trimIndent().replace("\n", "\r\n"),
+            extension.renderItem(extension.getUnreleased())
+        )
+    }
+
+    @Test
+    fun `creates new changelog file with CR line separator`() {
+        extension.lineSeparator.set("\r")
+
+        runTask(INITIALIZE_CHANGELOG_TASK_NAME)
+
+        assertMarkdown(
+            """
+            # Changelog
+
+            ## Unreleased
+
+            ### Added
+
+            ### Changed
+
+            ### Deprecated
+
+            ### Removed
+
+            ### Fixed
+
+            ### Security
+
+            """.trimIndent().replace("\n", "\r"),
+            extension.render()
+        )
+
+        assertMarkdown(
+            """
+            ## Unreleased
+
+            ### Added
+
+            ### Changed
+
+            ### Deprecated
+
+            ### Removed
+
+            ### Fixed
+
+            ### Security
+
+            """.trimIndent().replace("\n", "\r"),
+            extension.renderItem(extension.getUnreleased())
+        )
+    }
 }

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

@@ -1181,4 +1181,88 @@ class PatchChangelogTaskTest : BaseTest() {
 
         assertTrue(result.output.contains("Reusing configuration cache."))
     }
+
+    @Test
+    fun `patch with CRLF line separator`() {
+        changelog =
+            """
+            <!-- Foo bar -->
+
+            # Changelog
+            My project changelog.
+
+            ## [Unreleased]
+            Fancy release.
+
+            ### Added
+            - foo
+
+            ### Changed
+            - changed
+            - changed 2
+            """.trimIndent().replace("\n", "\r\n")
+
+        project.evaluate()
+        runTask(PATCH_CHANGELOG_TASK_NAME)
+
+        assertMarkdown(
+            """
+            ## [1.0.0] - $date
+            Fancy release.
+
+            ### Added
+            - foo
+
+            ### Changed
+            - changed
+            - changed 2
+
+            [1.0.0]: https://github.com/JetBrains/gradle-changelog-plugin/commits/v1.0.0
+
+            """.trimIndent().replace("\n", "\r\n"),
+            extension.renderItem(extension.get(version))
+        )
+    }
+
+    @Test
+    fun `patch with CR line separator`() {
+        changelog =
+            """
+            <!-- Foo bar -->
+
+            # Changelog
+            My project changelog.
+
+            ## [Unreleased]
+            Fancy release.
+
+            ### Added
+            - foo
+
+            ### Changed
+            - changed
+            - changed 2
+            """.trimIndent().replace("\n", "\r")
+
+        project.evaluate()
+        runTask(PATCH_CHANGELOG_TASK_NAME)
+
+        assertMarkdown(
+            """
+            ## [1.0.0] - $date
+            Fancy release.
+
+            ### Added
+            - foo
+
+            ### Changed
+            - changed
+            - changed 2
+
+            [1.0.0]: https://github.com/JetBrains/gradle-changelog-plugin/commits/v1.0.0
+
+            """.trimIndent().replace("\n", "\r"),
+            extension.renderItem(extension.get(version))
+        )
+    }
 }