Strip empty sections from keep-a-changelog release notes

src/Github/CreateReleaseTextViaKeepAChangelog.php

@@ -18,40 +18,25 @@
 use Symfony\Component\Process\Process;
 use Webmozart\Assert\Assert;
 
+use function array_reduce;
 use function count;
 use function explode;
 use function implode;
 use function preg_match;
 use function preg_quote;
 use function preg_replace;
 use function sprintf;
-use function str_replace;
 
 class CreateReleaseTextViaKeepAChangelog implements CreateReleaseText
 {
-    private const DEFAULT_CONTENTS = <<< 'CONTENTS'
-        ### Added
-
-        - Nothing.
-
-        ### Changed
-
-        - Nothing.
-
-        ### Deprecated
-
-        - Nothing.
-
-        ### Removed
-
-        - Nothing.
-
-        ### Fixed
-
-        - Nothing.
-
-        CONTENTS;
-
+    /** @psalm-var list<string> */
+    private const DEFAULT_SECTIONS = [
+        'Added',
+        'Changed',
+        'Deprecated',
+        'Removed',
+        'Fixed',
+    ];
 
     private ChangelogExists $changelogExists;
     private Clock $clock;
@@ -152,7 +137,15 @@ private function updateReleaseDate(string $changelog, string $version): string
      */
     private function removeDefaultContents(string $changelog): string
     {
-        $contents = str_replace(self::DEFAULT_CONTENTS, '', $changelog);
+        $contents = array_reduce(
+            self::DEFAULT_SECTIONS,
+            static fn (string $changelog, string $section): string => preg_replace(
+                "/\n\#{3} " . $section . "\n\n- Nothing.\n/s",
+                '',
+                $changelog
+            ),
+            $changelog
+        );
         Assert::notEmpty($contents);
 
         return $contents;

test/unit/Github/CreateReleaseTextViaKeepAChangelogTest.php

@@ -109,22 +109,43 @@ public function testExtractsReleaseTextViaChangelogFile(): void
             ### Added
 
             - Everything.
+            END, $date);
+
+        self::assertStringContainsString(
+            $expected,
+            (new CreateReleaseTextViaKeepAChangelog(new ChangelogExistsViaConsole(), $this->clock))
+                ->__invoke(
+                    $this->createMockMilestone(),
+                    RepositoryName::fromFullName('example/repo'),
+                    SemVerVersion::fromMilestoneName('1.0.0'),
+                    BranchName::fromName('1.0.x'),
+                    $workingPath
+                )
+                ->contents()
+        );
+    }
+
+    public function testExtractsNonEmptySectionsForVersionViaChangelogFile(): void
+    {
+        $date              = $this->clock->now()->format('Y-m-d');
+        $changelogContents = sprintf(self::CHANGELOG_MULTI_SECTION, $date);
+        $repositoryPath    = $this->createMockRepositoryWithChangelog(
+            $changelogContents,
+            'CHANGELOG.md',
+            '2.3.x'
+        );
+        $workingPath       = $this->checkoutMockRepositoryWithChangelog($repositoryPath);
+
+        $expected = sprintf(<<< 'END'
+            ## 2.3.12 - %s
 
-            ### Changed
-
-            - Nothing.
-
-            ### Deprecated
-
-            - Nothing.
-
-            ### Removed
-
-            - Nothing.
+            ### Added
 
+            - Something.
+
             ### Fixed
-            
-            - Nothing.
+
+            - Several things
             END, $date);
 
         self::assertStringContainsString(
@@ -133,8 +154,8 @@ public function testExtractsReleaseTextViaChangelogFile(): void
                 ->__invoke(
                     $this->createMockMilestone(),
                     RepositoryName::fromFullName('example/repo'),
-                    SemVerVersion::fromMilestoneName('1.0.0'),
-                    BranchName::fromName('1.0.x'),
+                    SemVerVersion::fromMilestoneName('2.3.12'),
+                    BranchName::fromName('2.3.x'),
                     $workingPath
                 )
                 ->contents()
@@ -163,7 +184,8 @@ private function createMockMilestone(): Milestone
      */
     private function createMockRepositoryWithChangelog(
         string $template,
-        string $filename = 'CHANGELOG.md'
+        string $filename = 'CHANGELOG.md',
+        string $initialBranch = '1.0.x'
     ): string {
         $repo = tempnam(sys_get_temp_dir(), 'CreateReleaseTextViaKeepAChangelog');
         Assert::notEmpty($repo);
@@ -181,7 +203,7 @@ private function createMockRepositoryWithChangelog(
         (new Process(['git', 'config', 'user.email', 'me@example.com'], $repo))->mustRun();
         (new Process(['git', 'config', 'user.name', 'Just Me'], $repo))->mustRun();
         (new Process(['git', 'commit', '-m', 'Initial import'], $repo))->mustRun();
-        (new Process(['git', 'switch', '-c', '1.0.x'], $repo))->mustRun();
+        (new Process(['git', 'switch', '-c', $initialBranch], $repo))->mustRun();
 
         return $repo;
     }
@@ -261,5 +283,56 @@ private function checkoutMockRepositoryWithChangelog(string $origin): string
 
         - Nothing.
 
+        END;
+
+    private const CHANGELOG_MULTI_SECTION = <<< 'END'
+        # Changelog
+
+        All notable changes to this project will be documented in this file, in reverse chronological order by release.
+
+        ## 2.3.12 - %s
+
+        ### Added
+
+        - Something.
+
+        ### Changed
+
+        - Nothing.
+
+        ### Deprecated
+
+        - Nothing.
+
+        ### Removed
+
+        - Nothing.
+
+        ### Fixed
+
+        - Several things
+
+        ## 0.1.0 - 2019-01-01
+
+        ### Added
+
+        - Everything.
+
+        ### Changed
+
+        - Nothing.
+
+        ### Deprecated
+
+        - Nothing.
+
+        ### Removed
+
+        - Nothing.
+
+        ### Fixed
+
+        - Nothing.
+
         END;
 }