fix #40 allow supplying an external colors file with "colors.file" config

readme.md

@@ -99,6 +99,10 @@ Enable parsing of POI blocks, provided with the mod in this repository
 Enable parsing of Travelnet boxes
 * Default: **true**
 
+### colors.file
+Supply an external colors file supplementary to the builtin tables
+Should be a valid filename or empty (no external colors)
+* Default: **none***
 
 # How it works
 

src/main/java/io/rudin/minetest/tileserver/config/TileServerConfig.java

@@ -13,6 +13,12 @@ public interface TileServerConfig extends Config {
 	@DefaultValue("8080")
 	int httPort();
 
+	/*
+	colors from external source
+	 */
+	@Key("colors.file")
+	String externalColorsFile();
+
 	/*
 	Tile renderer stuff
 	 */

src/main/java/io/rudin/minetest/tileserver/provider/ColorTableProvider.java

@@ -1,19 +1,49 @@
 package io.rudin.minetest.tileserver.provider;
 
+import javax.inject.Inject;
 import javax.inject.Provider;
 import javax.inject.Singleton;
 
 import io.rudin.minetest.tileserver.ColorTable;
+import io.rudin.minetest.tileserver.config.TileServerConfig;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.FileInputStream;
+import java.io.InputStream;
 
 @Singleton
 public class ColorTableProvider implements Provider<ColorTable> {
 
+	@Inject
+	public ColorTableProvider(TileServerConfig cfg){
+		this.cfg = cfg;
+	}
+
+	private final TileServerConfig cfg;
+
+	private static final Logger logger = LoggerFactory.getLogger(ColorTableProvider.class);
+
 	@Override
 	@Singleton
 	public ColorTable get() {
 		ColorTable colorTable = new ColorTable();
 		colorTable.load(ColorTableProvider.class.getResourceAsStream("/colors.txt"));
 		colorTable.load(ColorTableProvider.class.getResourceAsStream("/vanessa.txt"));
+
+		String externalColorsFile = cfg.externalColorsFile();
+		if (externalColorsFile != null){
+			logger.info("Loading colors from external file: '{}'", externalColorsFile);
+			try (InputStream input = new FileInputStream(externalColorsFile)){
+				colorTable.load(input);
+
+			} catch (Exception e){
+				logger.warn("external colors", e);
+
+			}
+
+		}
+
 		return colorTable;
 	}