From 6a1a9ecdbb74818818e0f53fc3e7ba9b2ec503bc Mon Sep 17 00:00:00 2001
From: delvh <dev.lh@web.de>
Date: Thu, 23 Jul 2020 15:50:45 +0200
Subject: [PATCH] Added consistent and safer way to get the currently requested
 command

---
 .../data/commands/SystemCommandsMap.java      | 58 ++++++++++++++-----
 1 file changed, 45 insertions(+), 13 deletions(-)

diff --git a/client/src/main/java/envoy/client/data/commands/SystemCommandsMap.java b/client/src/main/java/envoy/client/data/commands/SystemCommandsMap.java
index 5dedfd3..2eb45f2 100644
--- a/client/src/main/java/envoy/client/data/commands/SystemCommandsMap.java
+++ b/client/src/main/java/envoy/client/data/commands/SystemCommandsMap.java
@@ -128,8 +128,9 @@ public class SystemCommandsMap {
 		final boolean valid = commandBounds.matcher(command).matches();
 		if (!valid) EnvoyLog.getLogger(SystemCommandsMap.class)
 			.log(Level.WARNING,
-					"The command \"" + command + "\" is not valid. It will cause problems in execution: Only the characters " + commandBounds
-							+ "are allowed");
+					"The command \"" + command
+							+ "\" is not valid. As it will cause problems in execution, it will not be entered into the map. Only the characters "
+							+ commandBounds + "are allowed");
 		return valid;
 	}
 
@@ -153,10 +154,7 @@ public class SystemCommandsMap {
 	 * @return the wrapped system command, if present
 	 * @since Envoy Client v0.2-beta
 	 */
-	public Optional<SystemCommand> checkPresent(String input) {
-		final var firstWord = input.substring(0, input.indexOf(" "));
-		return Optional.ofNullable(systemCommands.get(firstWord));
-	}
+	public Optional<SystemCommand> checkPresent(String input) { return Optional.ofNullable(systemCommands.get(getCommand(input))); }
 
 	/**
 	 * Takes a 'raw' string (the whole input) and checks if a command is present
@@ -188,16 +186,52 @@ public class SystemCommandsMap {
 		for (int i = fromIndex; i < raw.length() - 2; i++)
 			// possibly a command was detected
 			if (raw.charAt(i) == '/') {
-				//
-				executeIfPresent(raw.substring(i + 1));
+				executeIfPresent(getCommand(raw, i));
 				// the command was executed successfully - no further checking needed
 				if (commandExecuted) {
 					commandExecuted = false;
+					logger.log(Level.FINE, "executed system command " + getCommand(raw, i));
 					break;
 				}
 			}
 	}
 
+	/**
+	 * This method ensures that the "/" of a {@link SystemCommand} is stripped.<br>
+	 * It returns the command as (most likely) entered as key in the map starting
+	 * from {@code fromIndex}.<br>
+	 * It should only be called on strings that contain a "/" .
+	 *
+	 * @param raw       the input
+	 * @param fromIndex the index from which to expect the system command -
+	 *                  regardless of whether the slash is still present at this
+	 *                  index
+	 * @return the command as entered in the map
+	 * @since Envoy Client v0.2-beta
+	 * @apiNote this method will (most likely) not return anything useful if
+	 *          whatever is entered after the slash is not a system command. Only
+	 *          exception: for recommendation purposes.
+	 */
+	public String getCommand(String raw, int fromIndex) {
+		final var index = raw.indexOf(' ');
+		return raw.substring(fromIndex + raw.charAt(0) == '/' ? 1 : 0, index < 1 ? raw.length() : index);
+	}
+
+	/**
+	 * This method ensures that the "/" of a {@link SystemCommand} is stripped.<br>
+	 * It returns the command as (most likely) entered as key in the map for the
+	 * first word of the text.<br>
+	 * It should only be called on strings that contain a "/" at position 0/-1.
+	 *
+	 * @param raw the input
+	 * @return the command as entered in the map
+	 * @since Envoy Client v0.2-beta
+	 * @apiNote this method will (most likely) not return anything useful if
+	 *          whatever is entered after the slash is not a system command. Only
+	 *          exception: for recommendation purposes.
+	 */
+	public String getCommand(String raw) { return getCommand(raw, 0); }
+
 	/**
 	 * This method checks if the input String is a key in the map and executes the
 	 * wrapped System command if present.
@@ -224,7 +258,7 @@ public class SystemCommandsMap {
 			// removed and only as many following words as allowed by the system command
 			// persist
 			final var remainingString = input.substring(input.indexOf(" ") + 1);
-			// TODO: Current implementation will fail in certain cases, i.e. two characters
+			// TODO: Current implementation will fail in certain cases, i.e. two spaces
 			// behind each other (" "), not enough words, ...
 			final var arguments = Arrays.copyOfRange(remainingString.split(" "), 0, systemCommand.getNumberOfArguments());
 			// Executing the function
@@ -232,9 +266,7 @@ public class SystemCommandsMap {
 				systemCommand.getAction().apply(arguments);
 				commandExecuted = true;
 			} catch (final Exception e) {
-				logger.log(Level.WARNING, "The system command " +
-				// detected command
-				input.substring(0, input.indexOf(" ")) + " threw an exception: ", e);
+				logger.log(Level.WARNING, "The system command " + getCommand(input) + " threw an exception: ", e);
 			}
 		});
 	}
@@ -267,7 +299,7 @@ public class SystemCommandsMap {
 	 * @since Envoy Client v0.2-beta
 	 */
 	private void requestRecommendations(String input, int fromIndex, Function<Set<String>, Void> action) {
-		final var partialCommand = input.substring(fromIndex + (input.charAt(fromIndex) == '/' ? 1 : 0), input.indexOf(" "));
+		final var partialCommand = getCommand(input, fromIndex);
 		// Get the expected commands
 		final var recommendations = recommendCommands(partialCommand);
 		if (recommendations.isEmpty()) return;