1 files changed, 30 insertions, 32 deletions

diff --git a/src/main/java/sevenUnitsGUI/Presenter.java b/src/main/java/sevenUnitsGUI/Presenter.java
index e471b01..0b5247d 100644
--- a/src/main/java/sevenUnitsGUI/Presenter.java
+++ b/src/main/java/sevenUnitsGUI/Presenter.java
@@ -57,8 +57,11 @@ import sevenUnits.utils.UncertainDouble;
  * @since 2021-12-15
  */
 public final class Presenter {
-	/** The place where settings are stored. */
-	private static final Optional<Path> CONFIG_FILE = getConfigPath();
+	/**
+	 * The place where settings are stored.
+	 * Both this path and its parent directory may not exist.
+	 */
+	private static final Path CONFIG_FILE = userConfigDir().resolve("SevenUnits").resolve("config.txt");
 	/** The default place where units are stored. */
 	private static final String DEFAULT_UNITS_FILEPATH = "/unitsfile.txt";
 	/** The default place where dimensions are stored. */
@@ -66,43 +69,27 @@ public final class Presenter {
 	/** The default place where exceptions are stored. */
 	private static final String DEFAULT_EXCEPTIONS_FILEPATH = "/metric_exceptions.txt";
 	
-	/** Gets the configuration file, creating the directory if needed. */
-	private static final Optional<Path> getConfigPath() {
-		final Path configDir;
+	private static final Path userConfigDir() {
 		if (System.getProperty("os.name").startsWith("Windows")) {
 			final String envFolder = System.getenv("LOCALAPPDATA");
 			if (envFolder == null || "".equals(envFolder)) {
-				configDir = Path.of(System.getenv("USERPROFILE"), "AppData", "Local", "SevenUnits");
+				return Path.of(System.getenv("USERPROFILE"), "AppData", "Local");
 			} else {
-				configDir = Path.of(envFolder, "SevenUnits");
+				return Path.of(envFolder);
 			}
 		} else {
 			final String envFolder = System.getenv("XDG_CONFIG_HOME");
 			if (envFolder == null || "".equals(envFolder)) {
-				configDir = Path.of(System.getenv("HOME"), ".config", "SevenUnits");
+				return Path.of(System.getenv("HOME"), ".config");
 			} else {
-				configDir = Path.of(envFolder, "SevenUnits");
-			}
-		}
-
-		// try to create config directory
-		if (!Files.exists(configDir)) {
-			try {
-				Files.createDirectory(configDir);
-			} catch (IOException e) {
-				e.printStackTrace();
-				return Optional.empty();
+				return Path.of(envFolder);
 			}
 		}
-
-		return Optional.of(configDir.resolve("config.txt"));
 	}
 
 	/** Gets a Path from a pathname in the config file. */
 	private static Path pathFromConfig(String pathname) {
-		return CONFIG_FILE.map(configFile ->
-			configFile.getParent().resolve(pathname)
-		).orElse(Path.of(pathname));
+		return CONFIG_FILE.getParent().resolve(pathname);
 	}
 
 	/**
@@ -305,9 +292,9 @@ public final class Presenter {
 		}
 		
 		// set default settings temporarily
-		CONFIG_FILE.ifPresentOrElse(this::loadSettings, () -> {
-			this.view.showErrorMessage("Config Loading Error", "Could not load config file - using default settings.");
-		});
+		if (Files.exists(CONFIG_FILE)) {
+			this.loadSettings(CONFIG_FILE);
+		}
 		
 		// a Predicate that returns true iff the argument is a full base unit
 		final Predicate<Unit> isFullBase = unit -> unit instanceof LinearUnit
@@ -710,14 +697,23 @@ public final class Presenter {
 	}
 	
 	/**
-	 * Saves the presenter's current settings to its default filepath.
+	 * Saves the presenter's current settings to the config file,
+	 * creating it if it doesn't exist.
 	 * 
-	 * @return true iff this operation succeeded
+	 * @return false iff the presenter could not write to the file
 	 * @since 2022-04-19
 	 */
 	public boolean saveSettings() {
-		CONFIG_FILE.ifPresent(this::saveSettings);
-		return CONFIG_FILE.isPresent();
+		final Path configDir = CONFIG_FILE.getParent();
+		if (!Files.exists(configDir)) {
+			try {
+				Files.createDirectories(configDir);
+			} catch (IOException e) {
+				return false;
+			}
+		}
+
+		return this.writeSettings(CONFIG_FILE);
 	}
 	
 	/**
@@ -726,7 +722,7 @@ public final class Presenter {
 	 * @param settingsFile file settings should be saved to
 	 * @since 2021-12-15
 	 */
-	void saveSettings(Path settingsFile) {
+	boolean writeSettings(Path settingsFile) {
 		try (BufferedWriter writer = Files.newBufferedWriter(settingsFile)) {
 			writer.write(String.format("number_display_rule=%s\n",
 					this.numberDisplayRule));
@@ -738,11 +734,13 @@ public final class Presenter {
 					String.format("include_duplicates=%s\n", this.showDuplicates));
 			writer.write(
 					String.format("search_prefix_rule=%s\n", this.searchRule));
+			return true;
 		} catch (final IOException e) {
 			e.printStackTrace();
 			this.view.showErrorMessage("I/O Error",
 					"Error occurred while saving settings: "
 							+ e.getLocalizedMessage());
+			return false;
 		}
 	}