Add update/unchanged file reporting to update-po command

features/updatepo.feature

@@ -583,3 +583,142 @@ Feature: Update existing PO files from a POT file
       """
     And STDERR should be empty
     And the contents of the foo-plugin/foo-plugin-de_DE.po file should match /First string.*Second string.*Third string/s
+
+  Scenario: Reports unchanged files when POT hasn't changed
+    Given an empty foo-plugin directory
+    And a foo-plugin/foo-plugin.pot file:
+      """
+      # Copyright (C) 2018 Foo Plugin
+      # This file is distributed under the same license as the Foo Plugin package.
+      msgid ""
+      msgstr ""
+      "Project-Id-Version: Foo Plugin\n"
+      "Report-Msgid-Bugs-To: https://wordpress.org/support/plugin/foo-plugin\n"
+      "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+      "Language-Team: LANGUAGE <LL@li.org>\n"
+      "MIME-Version: 1.0\n"
+      "Content-Type: text/plain; charset=UTF-8\n"
+      "Content-Transfer-Encoding: 8bit\n"
+      "POT-Creation-Date: 2018-05-02T22:06:24+00:00\n"
+      "PO-Revision-Date: 2018-05-02T22:06:24+00:00\n"
+      "X-Domain: foo-plugin\n"
+
+      #: foo-plugin.php:1
+      msgid "Some string"
+      msgstr ""
+      """
+    And a foo-plugin/foo-plugin-de_DE.po file:
+      """
+      # Copyright (C) 2018 Foo Plugin
+      # This file is distributed under the same license as the Foo Plugin package.
+      msgid ""
+      msgstr ""
+      "Project-Id-Version: Foo Plugin\n"
+      "Report-Msgid-Bugs-To: https://wordpress.org/support/plugin/foo-plugin\n"
+      "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+      "Language-Team: LANGUAGE <LL@li.org>\n"
+      "Language: de_DE\n"
+      "MIME-Version: 1.0\n"
+      "Content-Type: text/plain; charset=UTF-8\n"
+      "Content-Transfer-Encoding: 8bit\n"
+      "POT-Creation-Date: 2018-05-02T22:06:24+00:00\n"
+      "PO-Revision-Date: 2018-05-02T22:06:24+00:00\n"
+      "X-Domain: foo-plugin\n"
+      "Plural-Forms: nplurals=2; plural=(n != 1);\n"
+
+      #: foo-plugin.php:1
+      msgid "Some string"
+      msgstr "Some translated string"
+      """
+
+    When I run `wp i18n update-po foo-plugin/foo-plugin.pot`
+    Then STDOUT should be:
+      """
+      Success: Updated 0 files. 1 file unchanged.
+      """
+    And STDERR should be empty
+
+  Scenario: Reports both updated and unchanged files
+    Given an empty foo-plugin directory
+    And a foo-plugin/foo-plugin.pot file:
+      """
+      # Copyright (C) 2018 Foo Plugin
+      # This file is distributed under the same license as the Foo Plugin package.
+      msgid ""
+      msgstr ""
+      "Project-Id-Version: Foo Plugin\n"
+      "Report-Msgid-Bugs-To: https://wordpress.org/support/plugin/foo-plugin\n"
+      "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+      "Language-Team: LANGUAGE <LL@li.org>\n"
+      "MIME-Version: 1.0\n"
+      "Content-Type: text/plain; charset=UTF-8\n"
+      "Content-Transfer-Encoding: 8bit\n"
+      "POT-Creation-Date: 2018-05-02T22:06:24+00:00\n"
+      "PO-Revision-Date: 2018-05-02T22:06:24+00:00\n"
+      "X-Domain: foo-plugin\n"
+
+      #: foo-plugin.php:1
+      msgid "Some string"
+      msgstr ""
+
+      #: foo-plugin.php:15
+      msgid "Another new string"
+      msgstr ""
+      """
+    And a foo-plugin/foo-plugin-de_DE.po file:
+      """
+      # Copyright (C) 2018 Foo Plugin
+      # This file is distributed under the same license as the Foo Plugin package.
+      msgid ""
+      msgstr ""
+      "Project-Id-Version: Foo Plugin\n"
+      "Report-Msgid-Bugs-To: https://wordpress.org/support/plugin/foo-plugin\n"
+      "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+      "Language-Team: LANGUAGE <LL@li.org>\n"
+      "Language: de_DE\n"
+      "MIME-Version: 1.0\n"
+      "Content-Type: text/plain; charset=UTF-8\n"
+      "Content-Transfer-Encoding: 8bit\n"
+      "POT-Creation-Date: 2018-05-02T22:06:24+00:00\n"
+      "PO-Revision-Date: 2018-05-02T22:06:24+00:00\n"
+      "X-Domain: foo-plugin\n"
+      "Plural-Forms: nplurals=2; plural=(n != 1);\n"
+
+      #: foo-plugin.php:10
+      msgid "Some string"
+      msgstr "Some translated string"
+      """
+    And a foo-plugin/foo-plugin-es_ES.po file:
+      """
+      # Copyright (C) 2018 Foo Plugin
+      # This file is distributed under the same license as the Foo Plugin package.
+      msgid ""
+      msgstr ""
+      "Project-Id-Version: Foo Plugin\n"
+      "Report-Msgid-Bugs-To: https://wordpress.org/support/plugin/foo-plugin\n"
+      "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+      "Language-Team: LANGUAGE <LL@li.org>\n"
+      "Language: es_ES\n"
+      "MIME-Version: 1.0\n"
+      "Content-Type: text/plain; charset=UTF-8\n"
+      "Content-Transfer-Encoding: 8bit\n"
+      "POT-Creation-Date: 2018-05-02T22:06:24+00:00\n"
+      "PO-Revision-Date: 2018-05-02T22:06:24+00:00\n"
+      "X-Domain: foo-plugin\n"
+      "Plural-Forms: nplurals=2; plural=(n != 1);\n"
+
+      #: foo-plugin.php:1
+      msgid "Some string"
+      msgstr "Some translated string"
+
+      #: foo-plugin.php:15
+      msgid "Another new string"
+      msgstr "Otra nueva cadena"
+      """
+
+    When I run `wp i18n update-po foo-plugin/foo-plugin.pot`
+    Then STDOUT should be:
+      """
+      Success: Updated 1 file. 1 file unchanged.
+      """
+    And STDERR should be empty

src/UpdatePoCommand.php

@@ -41,6 +41,10 @@ class UpdatePoCommand extends WP_CLI_Command {
 	 *     $ wp i18n update-po example-plugin.pot languages
 	 *     Success: Updated 2 files.
 	 *
+	 *     # Shows message when some files don't need updating.
+	 *     $ wp i18n update-po example-plugin.pot languages
+	 *     Success: Updated 2 files. 1 file unchanged.
+	 *
 	 * @when before_wp_load
 	 *
 	 * @throws WP_CLI\ExitException
@@ -69,7 +73,8 @@ public function __invoke( $args, $assoc_args ) {
 
 		$pot_translations = Translations::fromPoFile( $source );
 
-		$result_count = 0;
+		$updated_count   = 0;
+		$unchanged_count = 0;
 		/** @var DirectoryIterator $file */
 		foreach ( $files as $file ) {
 			if ( 'po' !== $file->getExtension() ) {
@@ -81,12 +86,17 @@ public function __invoke( $args, $assoc_args ) {
 				continue;
 			}
 
-			$po_translations = Translations::fromPoFile( $file->getPathname() );
+			$po_translations       = Translations::fromPoFile( $file->getPathname() );
+			$original_translations = clone $po_translations;
+
 			$po_translations->mergeWith(
 				$pot_translations,
 				Merge::ADD | Merge::REMOVE | Merge::COMMENTS_THEIRS | Merge::EXTRACTED_COMMENTS_THEIRS | Merge::REFERENCES_THEIRS | Merge::DOMAIN_OVERRIDE
 			);
 
+			// Check if the translations actually changed by comparing the objects.
+			$has_changes = $this->translations_differ( $original_translations, $po_translations );
+
 			// Update PO-Revision-Date to current date and time in UTC.
 			// Uses gmdate() for consistency across different server timezones.
 			$po_translations->setHeader( 'PO-Revision-Date', gmdate( 'Y-m-d\TH:i:sP' ) );
@@ -99,10 +109,87 @@ public function __invoke( $args, $assoc_args ) {
 				continue;
 			}
 
-			++$result_count;
+			if ( $has_changes ) {
+				++$updated_count;
+			} else {
+				++$unchanged_count;
+			}
+		}
+
+		// Build the success message.
+		$message_parts   = array();
+		$message_parts[] = sprintf( 'Updated %d %s', $updated_count, Utils\pluralize( 'file', $updated_count ) );
+		if ( $unchanged_count > 0 ) {
+			$message_parts[] = sprintf( '%d %s unchanged', $unchanged_count, Utils\pluralize( 'file', $unchanged_count ) );
+		}
+
+		WP_CLI::success( implode( '. ', $message_parts ) . '.' );
+	}
+
+	/**
+	 * Check if two Translations objects differ.
+	 *
+	 * @param Translations $original Original translations.
+	 * @param Translations $updated  Updated translations.
+	 * @return bool True if translations differ, false otherwise.
+	 */
+	private function translations_differ( Translations $original, Translations $updated ) {
+		// Quick check: if counts differ, they're different.
+		if ( count( $original ) !== count( $updated ) ) {
+			return true;
+		}
+
+		// Compare each translation entry.
+		foreach ( $original as $translation ) {
+			$context      = $translation->getContext();
+			$original_str = $translation->getOriginal();
+
+			// Find the corresponding translation in the updated set.
+			$updated_translation = $updated->find( $context, $original_str );
+
+			// If translation doesn't exist in updated set, they differ.
+			if ( ! $updated_translation ) {
+				return true;
+			}
+
+			// Compare translation strings.
+			if ( $translation->getTranslation() !== $updated_translation->getTranslation() ) {
+				return true;
+			}
+
+			// Compare plural translations if they exist.
+			$original_plurals = $translation->getPluralTranslations();
+			$updated_plurals  = $updated_translation->getPluralTranslations();
+
+			if ( $original_plurals !== $updated_plurals ) {
+				return true;
+			}
+
+			// Compare references (source code locations).
+			$original_refs = $translation->getReferences();
+			$updated_refs  = $updated_translation->getReferences();
+
+			$original_refs_sorted = $original_refs;
+			$updated_refs_sorted  = $updated_refs;
+
+			sort( $original_refs_sorted );
+			sort( $updated_refs_sorted );
+
+			if ( $original_refs_sorted !== $updated_refs_sorted ) {
+				return true;
+			}
+
+			// Compare comments.
+			if ( $translation->getExtractedComments() !== $updated_translation->getExtractedComments() ) {
+				return true;
+			}
+
+			if ( $translation->getComments() !== $updated_translation->getComments() ) {
+				return true;
+			}
 		}
 
-		WP_CLI::success( sprintf( 'Updated %d %s.', $result_count, Utils\pluralize( 'file', $result_count ) ) );
+		return false;
 	}
 
 	/**