change regex to match also grafted branches

Author: ilovemilk

src/main/kotlin/io/wusa/GitService.kt

@@ -103,7 +103,7 @@ class GitService {
 
         private fun getCurrentBranch(project: Project): String {
             val head = GitCommandRunner.execute(project.projectDir, arrayOf("log", "-n", "1", "--pretty=%d", "HEAD"))
-            return """\(HEAD -> (.*?)[,|)]""".toRegex().find(head)!!.groupValues[1]
+            return """\([grafted, ]{0,9}HEAD -> (.*?)[,|)]""".toRegex().find(head)!!.groupValues[1]
         }
     }
 }

src/test/kotlin/io/wusa/GitServiceTest.kt

@@ -174,6 +174,13 @@ class GitServiceTest {
         Assertions.assertEquals("feature/PascalCase", GitService.currentBranch(project))
     }
 
+    @Test
+    fun `issue-65 grafted branch`() {
+        every { GitCommandRunner.execute(projectDir = any(), args = any()) } returns
+                "(grafted, HEAD -> release-workflows, origin/release-workflows)"
+        Assertions.assertEquals("release-workflows", GitService.currentBranch(project))
+    }
+
     @Test
     fun `get current branch with null pointer exception`() {
         every { GitCommandRunner.execute(projectDir = any(), args = any()) } throws KotlinNullPointerException()