Improvements

src/main/java/com/crowdin/cli/BaseCli.java

@@ -57,4 +57,8 @@ public class BaseCli {
     public enum LanguageCode {
         two_letters_code, three_letters_code, locale, android_code, osx_code, osx_locale
     }
+
+    public static final Integer CHECK_WAITING_TIME_FIRST = 1000;
+    public static final Integer CHECK_WAITING_TIME_INCREMENT = 500;
+    public static final Integer CHECK_WAITING_TIME_MAX = 5000;
 }

src/main/java/com/crowdin/cli/commands/actions/DownloadAction.java

@@ -43,8 +43,13 @@
 import java.util.Set;
 import java.util.TreeMap;
 import java.util.TreeSet;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.Collectors;
 
+import static com.crowdin.cli.BaseCli.CHECK_WAITING_TIME_FIRST;
+import static com.crowdin.cli.BaseCli.CHECK_WAITING_TIME_INCREMENT;
+import static com.crowdin.cli.BaseCli.CHECK_WAITING_TIME_MAX;
 import static com.crowdin.cli.BaseCli.RESOURCE_BUNDLE;
 import static com.crowdin.cli.utils.console.ExecutionStatus.ERROR;
 import static com.crowdin.cli.utils.console.ExecutionStatus.OK;
@@ -200,6 +205,7 @@ public void act(Outputter out, PropertiesWithFiles pb, ProjectClient client) {
             Map<String, List<String>> totalOmittedFiles = null;
             List<List<String>> omittedFilesNoSources = new ArrayList<>();
 
+            AtomicBoolean anyFileDownloaded = new AtomicBoolean(false);
             for (File tempDir : fileBeansWithDownloadedFilesNoRepetitions.keySet()) {
                 Set<Pair<String, String>> filesWithMapping = fileBeansWithDownloadedFilesNoRepetitions.get(tempDir);
                 List<String> downloadedFiles = tempDirs.get(tempDir);
@@ -208,6 +214,7 @@ public void act(Outputter out, PropertiesWithFiles pb, ProjectClient client) {
                     sortFiles(downloadedFiles, filesWithMapping, pb.getBasePath(), tempDir.getAbsolutePath() + Utils.PATH_SEPARATOR);
                 new TreeMap<>(result.getLeft()).forEach((fromFile, toFile) -> { //files to extract
                     files.copyFile(fromFile, toFile);
+                    anyFileDownloaded.set(true);
                     if (!plainView) {
                         out.println(OK.withIcon(
                             String.format(
@@ -242,10 +249,15 @@ public void act(Outputter out, PropertiesWithFiles pb, ProjectClient client) {
                 omittedFilesNoSources.add(allOmittedFilesNoSources);
             }
 
+            if (!anyFileDownloaded.get()) {
+                out.println(WARNING.withIcon(RESOURCE_BUNDLE.getString("message.warning.no_file_to_download")));
+            }
+
             if (!ignoreMatch && !plainView) {
                 totalOmittedFiles = totalOmittedFiles.entrySet().stream()
                     .filter(entry -> !entry.getValue().isEmpty())
                     .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+
                 if (!totalOmittedFiles.isEmpty()) {
                     out.println(WARNING.withIcon(RESOURCE_BUNDLE.getString("message.downloaded_files_omitted")));
                     totalOmittedFiles.forEach((file, translations) -> {
@@ -348,6 +360,7 @@ private String replaceFileName(String filePath, String newName) {
     }
 
     private ProjectBuild buildTranslation(ProjectClient client, BuildProjectTranslationRequest request) {
+        AtomicInteger sleepTime = new AtomicInteger(CHECK_WAITING_TIME_FIRST);
         return ConsoleSpinner.execute(out, "message.spinner.fetching_project_info",
             "error.collect_project_info", this.noProgress, this.plainView, () -> {
                 ProjectBuild build = client.startBuildingTranslation(request);
@@ -356,7 +369,7 @@ private ProjectBuild buildTranslation(ProjectClient client, BuildProjectTranslat
                     ConsoleSpinner.update(
                         String.format(RESOURCE_BUNDLE.getString("message.building_translation"),
                             Math.toIntExact(build.getProgress())));
-                    Thread.sleep(100);
+                    Thread.sleep(sleepTime.getAndUpdate(val -> val < CHECK_WAITING_TIME_MAX ? val + CHECK_WAITING_TIME_INCREMENT : CHECK_WAITING_TIME_MAX));
                     build = client.checkBuildingTranslation(build.getId());
                 }
                 ConsoleSpinner.update(String.format(RESOURCE_BUNDLE.getString("message.building_translation"), 100));

src/main/java/com/crowdin/cli/commands/functionality/FsFiles.java

@@ -8,6 +8,7 @@
 import java.io.InputStream;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -48,10 +49,16 @@ public List<File> extractZipArchive(File zipArchive, File dir) {
                 throw new RuntimeException(RESOURCE_BUNDLE.getString("error.creatingDirectory"));
             }
         }
+        Integer filesQnt = null;
         try {
+            filesQnt = zipFile.getFileHeaders().size();
             zipFile.extractAll(dir.getAbsolutePath());
         } catch (net.lingala.zip4j.exception.ZipException e) {
-            throw new RuntimeException(String.format(RESOURCE_BUNDLE.getString("error.extract_archive"), zipArchive.getAbsolutePath()));
+            if (filesQnt != null && filesQnt.equals(1)) {
+                return new ArrayList<>();
+            } else {
+                throw new RuntimeException(String.format(RESOURCE_BUNDLE.getString("error.extract_archive"), zipArchive.getAbsolutePath()));
+            }
         }
         try {
             return java.nio.file.Files.walk(dir.toPath())

src/main/java/com/crowdin/cli/utils/PlaceholderUtil.java

@@ -178,7 +178,7 @@ public String replaceFileDependentPlaceholders(String toFormat, File file) {
         String fileNameWithoutExt = FilenameUtils.removeExtension(fileName);
         String fileExt = FilenameUtils.getExtension(fileName);
         String tempBasePath = basePath;
-        String fileParent = StringUtils.removeStart((file.getParent() != null ? file.getParent() + Utils.PATH_SEPARATOR : ""), tempBasePath);
+        String fileParent = Utils.noSepAtEnd(StringUtils.removeStart((file.getParent() != null ? file.getParent() + Utils.PATH_SEPARATOR : ""), tempBasePath));
 
         toFormat = toFormat.contains(PLACEHOLDER_ORIGINAL_FILE_NAME) ? toFormat.replace(PLACEHOLDER_ORIGINAL_FILE_NAME, fileName) : toFormat;
         toFormat = toFormat.contains(PLACEHOLDER_FILE_NAME) ? toFormat.replace(PLACEHOLDER_FILE_NAME, fileNameWithoutExt) : toFormat;

src/main/resources/messages/messages.properties

@@ -474,6 +474,7 @@ message.warning.not_yml=File @|bold '%s'|@ is not a YAML or YML file
 message.warning.browser_not_found=\nError opening a web browser. Please open the following link manually:\n@|bold %s|@
 message.warning.file_not_uploaded_cause_of_language=Translation file @|yellow,bold '%s'|@ @|yellow hasn't been uploaded|@ since @|bold %s|@ is not enabled as a target language for the source file in your Crowdin project
 message.warning.auto_approve_option_with_mt='--auto-approve-option' is used only for the TM Pre-Translation method
+message.warning.no_file_to_download=Couldn't find any file to download
 
 message.spinner.fetching_project_info=Fetching project info
 message.spinner.building_translation=Building translations