Added `/moo search` to search through mc log files

15 files changed, 749 insertions, 30 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 79260f4..df34081 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [1.8.9-0.6.0] - unreleased
 ### Added
+- Minecraft log file search `/moo search`
 - List SkyBlock info of a player `/moo stalkskyblock <playerName>`
 
 ### Changed
diff --git a/README.md b/README.md
index 9954d89..f99a729 100644
--- a/README.md
+++ b/README.md
@@ -4,9 +4,10 @@ A client-side only Forge mod by [Cow](https://namemc.com/profile/Cow) providing
 ## Current features
 | Feature                                                                 | Command/Usage                           |
 |-------------------------------------------------------------------------|-----------------------------------------|
-| 'Best friends' list to limit the amount of join and leave notifications (always up-to-date names even after player name changes) | `/moo add/remove/list`                  |
+| 'Best friends' list to limit the amount of join and leave notifications (always up-to-date names even after player name changes) | `/moo add/remove/list` |
+| Search through your Minecraft log files                                 | `/moo search`                           |
 | Stalk a player (check online status, current game, ...)                 | `/moo stalk`                            |
-| Stalk SkyBlock stats of a player                                        | `/moo stalkskyblock`       |
+| Stalk SkyBlock stats of a player                                        | `/moo stalkskyblock`                    |
 | Toggle join/leave notifications for friends, guild members or best friends separately | `/moo toggle`             |
 | Copy chat component                                                     | <kbd>ALT</kbd> + <kbd>right click</kbd><br>Hold <kbd>shift</kbd> to copy full component |
 | Tab-completable usernames for several commands (e.g. `/party`, `/invite`, ...) | `/moo config` &rarr; `Commands with Tab-completable usernames` for full list of commands |
diff --git a/src/main/java/eu/olli/cowmoonication/Cowmoonication.java b/src/main/java/eu/olli/cowmoonication/Cowmoonication.java
index 2460058..45fb791 100644
--- a/src/main/java/eu/olli/cowmoonication/Cowmoonication.java
+++ b/src/main/java/eu/olli/cowmoonication/Cowmoonication.java
@@ -44,6 +44,7 @@ public class Cowmoonication {
     public void preInit(FMLPreInitializationEvent e) {
         instance = this;
         logger = e.getModLog();
+        modsDir = e.getSourceFile().getParentFile();
 
         File modDir = new File(e.getModConfigurationDirectory(), MODID + File.separatorChar);
         if (!modDir.exists()) {
@@ -54,7 +55,6 @@ public class Cowmoonication {
         config = new MooConfig(this, new Configuration(new File(modDir, MODID + ".cfg")));
 
         chatHelper = new ChatHelper();
-        modsDir = e.getSourceFile().getParentFile();
     }
 
     @EventHandler
@@ -94,7 +94,7 @@ public class Cowmoonication {
         return playerCache;
     }
 
-    public File getModsFolder() {
+    public File getModsDirectory() {
         return modsDir;
     }
 
diff --git a/src/main/java/eu/olli/cowmoonication/command/MooCommand.java b/src/main/java/eu/olli/cowmoonication/command/MooCommand.java
index 4ad4e2c..b4d357d 100644
--- a/src/main/java/eu/olli/cowmoonication/command/MooCommand.java
+++ b/src/main/java/eu/olli/cowmoonication/command/MooCommand.java
@@ -10,6 +10,7 @@ import eu.olli.cowmoonication.config.MooGuiConfig;
 import eu.olli.cowmoonication.data.Friend;
 import eu.olli.cowmoonication.data.HySkyBlockStats;
 import eu.olli.cowmoonication.data.HyStalkingData;
+import eu.olli.cowmoonication.search.GuiSearch;
 import eu.olli.cowmoonication.util.ApiUtils;
 import eu.olli.cowmoonication.util.MooChatComponent;
 import eu.olli.cowmoonication.util.TickDelay;
@@ -70,6 +71,8 @@ public class MooCommand extends CommandBase {
         // sub-commands: miscellaneous
         else if (args[0].equalsIgnoreCase("config") || args[0].equalsIgnoreCase("toggle")) {
             new TickDelay(() -> Minecraft.getMinecraft().displayGuiScreen(new MooGuiConfig(null)), 1); // delay by 1 tick, because the chat closing would close the new gui instantly as well.
+        } else if (args[0].equalsIgnoreCase("search")) {
+            new TickDelay(() -> Minecraft.getMinecraft().displayGuiScreen(new GuiSearch()), 1); // delay by 1 tick, because the chat closing would close the new gui instantly as well.
         } else if (args[0].equalsIgnoreCase("guiscale")) {
             int currentGuiScale = (Minecraft.getMinecraft()).gameSettings.guiScale;
             if (args.length == 1) {
@@ -105,19 +108,19 @@ public class MooCommand extends CommandBase {
                             .setChatHoverEvent(new HoverEvent(HoverEvent.Action.SHOW_TEXT, new ChatComponentText(EnumChatFormatting.YELLOW + "Download the latest version of " + Cowmoonication.MODNAME + "\n\u279C Click to download latest mod file")))))
                     .appendSibling(new ChatComponentText("\n\u278B" + EnumChatFormatting.YELLOW + " exit Minecraft").setChatStyle(new ChatStyle().setColor(EnumChatFormatting.GOLD).setBold(false)
                             .setChatHoverEvent(new HoverEvent(HoverEvent.Action.SHOW_TEXT, new ChatComponentText(EnumChatFormatting.GOLD + "\u278B" + EnumChatFormatting.YELLOW + " Without closing Minecraft first,\n" + EnumChatFormatting.YELLOW + "you can't delete the old .jar file!")))))
-                    .appendSibling(new ChatComponentText("\n\u278C" + EnumChatFormatting.YELLOW + " copy " + EnumChatFormatting.GOLD + Cowmoonication.MODNAME.replace(" ", "") + "-" + main.getVersionChecker().getNewVersion() + ".jar" + EnumChatFormatting.YELLOW + " into mods folder").setChatStyle(new ChatStyle().setColor(EnumChatFormatting.GOLD).setBold(false)
-                            .setChatClickEvent(new ClickEvent(ClickEvent.Action.RUN_COMMAND, "/moo folder"))
-                            .setChatHoverEvent(new HoverEvent(HoverEvent.Action.SHOW_TEXT, new ChatComponentText(EnumChatFormatting.YELLOW + "Open mods folder with command " + EnumChatFormatting.GOLD + "/moo folder\n\u279C Click to open mods folder")))))
+                    .appendSibling(new ChatComponentText("\n\u278C" + EnumChatFormatting.YELLOW + " copy " + EnumChatFormatting.GOLD + Cowmoonication.MODNAME.replace(" ", "") + "-" + main.getVersionChecker().getNewVersion() + ".jar" + EnumChatFormatting.YELLOW + " into mods directory").setChatStyle(new ChatStyle().setColor(EnumChatFormatting.GOLD).setBold(false)
+                            .setChatClickEvent(new ClickEvent(ClickEvent.Action.RUN_COMMAND, "/moo directory"))
+                            .setChatHoverEvent(new HoverEvent(HoverEvent.Action.SHOW_TEXT, new ChatComponentText(EnumChatFormatting.YELLOW + "Open mods directory with command " + EnumChatFormatting.GOLD + "/moo directory\n\u279C Click to open mods directory")))))
                     .appendSibling(new ChatComponentText("\n\u278D" + EnumChatFormatting.YELLOW + " delete old mod file " + EnumChatFormatting.GOLD + Cowmoonication.MODNAME.replace(" ", "") + "-" + Cowmoonication.VERSION + ".jar ").setChatStyle(new ChatStyle().setColor(EnumChatFormatting.GOLD).setBold(false)))
                     .appendSibling(new ChatComponentText("\n\u278E" + EnumChatFormatting.YELLOW + " start Minecraft again").setChatStyle(new ChatStyle().setColor(EnumChatFormatting.GOLD).setBold(false))));
         } else if (args[0].equalsIgnoreCase("version")) {
             main.getVersionChecker().handleVersionStatus(true);
-        } else if (args[0].equalsIgnoreCase("folder")) {
+        } else if (args[0].equalsIgnoreCase("directory") || args[0].equalsIgnoreCase("folder")) {
             try {
-                Desktop.getDesktop().open(main.getModsFolder());
+                Desktop.getDesktop().open(main.getModsDirectory());
             } catch (IOException e) {
                 e.printStackTrace();
-                throw new MooCommandException("\u2716 An error occurred trying to open the mod's folder. I guess you have to open it manually \u00af\\_(\u30c4)_/\u00af");
+                throw new MooCommandException("\u2716 An error occurred trying to open the mod's directory. I guess you have to open it manually \u00af\\_(\u30c4)_/\u00af");
             }
         }
         // "catch-all" remaining sub-commands
@@ -379,13 +382,14 @@ public class MooCommand extends CommandBase {
                 .appendSibling(createCmdHelpEntry("toggle", "Toggle join/leave notifications"))
                 .appendSibling(createCmdHelpSection(2, "Miscellaneous"))
                 .appendSibling(createCmdHelpEntry("config", "Open mod's configuration"))
+                .appendSibling(createCmdHelpEntry("search", "Open Minecraft log search"))
                 .appendSibling(createCmdHelpEntry("guiScale", "Change GUI scale"))
                 .appendSibling(createCmdHelpEntry("shrug", "\u00AF\\_(\u30C4)_/\u00AF")) // ¯\_(ツ)_/¯
                 .appendSibling(createCmdHelpSection(3, "Update mod"))
                 .appendSibling(createCmdHelpEntry("update", "Check for new mod updates"))
                 .appendSibling(createCmdHelpEntry("updateHelp", "Show mod update instructions"))
                 .appendSibling(createCmdHelpEntry("version", "View results of last mod update check"))
-                .appendSibling(createCmdHelpEntry("folder", "Open Minecraft's mods folder"));
+                .appendSibling(createCmdHelpEntry("directory", "Open Minecraft's mods directory"));
         sender.addChatMessage(usage);
     }
 
@@ -410,12 +414,12 @@ public class MooCommand extends CommandBase {
         if (args.length == 1) {
             return getListOfStringsMatchingLastWord(args,
                     /* friends */  "stalk", "stalkskyblock", "skyblockstalk", "add", "remove", "list", "nameChangeCheck", "toggle",
-                    /* miscellaneous */ "config", "guiscale", "shrug", "apikey",
-                    /* update mod */ "update", "updateHelp", "version", "folder",
+                    /* miscellaneous */ "config", "search", "guiscale", "shrug", "apikey",
+                    /* update mod */ "update", "updateHelp", "version", "directory",
                     /* help */ "help");
         } else if (args.length == 2 && args[0].equalsIgnoreCase("remove")) {
             return getListOfStringsMatchingLastWord(args, main.getFriendsHandler().getBestFriends());
-        } else if (args.length == 2 && args[0].equalsIgnoreCase("stalk")) {
+        } else if (args.length == 2 && args[0].toLowerCase().contains("stalk")) { // stalk & stalkskyblock
             return getListOfStringsMatchingLastWord(args, main.getPlayerCache().getAllNamesSorted());
         }
         return null;
diff --git a/src/main/java/eu/olli/cowmoonication/config/MooConfig.java b/src/main/java/eu/olli/cowmoonication/config/MooConfig.java
index cb852a7..4500e34 100644
--- a/src/main/java/eu/olli/cowmoonication/config/MooConfig.java
+++ b/src/main/java/eu/olli/cowmoonication/config/MooConfig.java
@@ -4,28 +4,50 @@ import eu.olli.cowmoonication.Cowmoonication;
 import eu.olli.cowmoonication.util.Utils;
 import net.minecraft.client.Minecraft;
 import net.minecraft.util.EnumChatFormatting;
+import net.minecraft.util.Util;
+import net.minecraftforge.common.ForgeModContainer;
 import net.minecraftforge.common.MinecraftForge;
 import net.minecraftforge.common.config.Configuration;
 import net.minecraftforge.common.config.Property;
+import net.minecraftforge.fml.client.FMLConfigGuiFactory;
 import net.minecraftforge.fml.client.event.ConfigChangedEvent;
 import net.minecraftforge.fml.common.eventhandler.EventPriority;
 import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
 
+import java.io.File;
+import java.time.LocalDate;
+import java.time.format.DateTimeParseException;
+import java.time.temporal.ChronoUnit;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.regex.Pattern;
 
+/**
+ * Mod configuration via ingame gui
+ * <p>
+ * Based on <a href="https://github.com/TheGreyGhost/MinecraftByExample/blob/1-8-9final/src/main/java/minecraftbyexample/mbe70_configuration/MBEConfiguration.java">TheGreyGhost's MinecraftByExample</a>
+ *
+ * @see ForgeModContainer
+ * @see FMLConfigGuiFactory
+ */
 public class MooConfig {
+    public static final String CATEGORY_LOGS_SEARCH = "logssearch";
+    // main config
     public static boolean doUpdateCheck;
     public static boolean showBestFriendNotifications;
     public static boolean showFriendNotifications;
     public static boolean showGuildNotifications;
     public static String[] tabCompletableNamesCommands;
+    // logs search config
+    public static String[] logsDirs;
+    private static String defaultStartDate;
+    // other stuff
     public static String moo;
     private static Configuration cfg = null;
     private final Cowmoonication main;
     private List<String> propOrderGeneral;
+    private List<String> propOrderLogsSearch;
 
     public MooConfig(Cowmoonication main, Configuration configuration) {
         this.main = main;
@@ -52,7 +74,7 @@ public class MooConfig {
     /**
      * Save the GUI-altered values to disk
      */
-    private void syncFromGUI() {
+    private void syncFromGui() {
         syncConfig(false, true);
     }
 
@@ -63,6 +85,22 @@ public class MooConfig {
         syncConfig(false, false);
     }
 
+    public static LocalDate calculateStartDate() {
+        try {
+            // date format: yyyy-mm-dd
+            return LocalDate.parse(defaultStartDate);
+        } catch (DateTimeParseException e) {
+            // fallthrough
+        }
+        try {
+            int months = Integer.parseInt(defaultStartDate);
+            return LocalDate.now().minus(months, ChronoUnit.MONTHS);
+        } catch (NumberFormatException e) {
+            // default: 1 month
+            return LocalDate.now().minus(1, ChronoUnit.MONTHS);
+        }
+    }
+
     /**
      * Synchronise the three copies of the data
      * 1) loadConfigFromFile && readFieldsFromConfig -> initialise everything from the disk file
@@ -76,6 +114,8 @@ public class MooConfig {
         if (loadConfigFromFile) {
             cfg.load();
         }
+
+        // config section: main configuration
         propOrderGeneral = new ArrayList<>();
 
         Property propDoUpdateCheck = addConfigEntry(cfg.get(Configuration.CATEGORY_CLIENT,
@@ -94,11 +134,24 @@ public class MooConfig {
 
         cfg.setCategoryPropertyOrder(Configuration.CATEGORY_CLIENT, propOrderGeneral);
 
+        // config section: log files search
+        propOrderLogsSearch = new ArrayList<>();
+
+        Property propLogsDirs = addConfigEntry(cfg.get(CATEGORY_LOGS_SEARCH,
+                "logsDirs", resolveDefaultLogsDirs(),
+                "Directories with Minecraft log files"), true, CATEGORY_LOGS_SEARCH);
+        Property propDefaultStartDate = addConfigEntry(cfg.get(CATEGORY_LOGS_SEARCH,
+                "defaultStartDate", "3", "Default start date (a number means X months ago, alternatively a fixed date à la yyyy-mm-dd can be used)"), true)
+                .setValidationPattern(Pattern.compile("^[1-9][0-9]{0,2}|(2[0-9]{3}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01]))$"));
+
+        cfg.setCategoryPropertyOrder(CATEGORY_LOGS_SEARCH, propOrderLogsSearch);
+
         // 'manual' replacement for propTabCompletableNamesCommands.hasChanged()
         boolean modifiedTabCompletableCommandsList = false;
         String[] tabCompletableCommandsPreChange = tabCompletableNamesCommands != null ? tabCompletableNamesCommands.clone() : null;
 
         if (readFieldsFromConfig) {
+            // main config
             doUpdateCheck = propDoUpdateCheck.getBoolean();
             showBestFriendNotifications = propShowBestFriendNotifications.getBoolean();
             showFriendNotifications = propShowFriendNotifications.getBoolean();
@@ -106,11 +159,16 @@ public class MooConfig {
             tabCompletableNamesCommands = propTabCompletableNamesCommands.getStringList();
             moo = propMoo.getString();
 
+            // logs search config
+            logsDirs = propLogsDirs.getStringList();
+            defaultStartDate = propDefaultStartDate.getString().trim();
+
             if (!Arrays.equals(tabCompletableCommandsPreChange, tabCompletableNamesCommands)) {
                 modifiedTabCompletableCommandsList = true;
             }
         }
 
+        // main config
         propDoUpdateCheck.set(doUpdateCheck);
         propShowBestFriendNotifications.set(showBestFriendNotifications);
         propShowFriendNotifications.set(showFriendNotifications);
@@ -118,6 +176,10 @@ public class MooConfig {
         propTabCompletableNamesCommands.set(tabCompletableNamesCommands);
         propMoo.set(moo);
 
+        // logs search config
+        propLogsDirs.set(logsDirs);
+        propDefaultStartDate.set(defaultStartDate);
+
         if (cfg.hasChanged()) {
             if (modifiedTabCompletableCommandsList && Minecraft.getMinecraft().thePlayer != null) {
                 main.getChatHelper().sendMessage(EnumChatFormatting.RED, "Added or removed commands with tab-completable usernames take effect after a game restart!");
@@ -126,16 +188,59 @@ public class MooConfig {
         }
     }
 
-    private Property addConfigEntry(Property property, boolean showInGui) {
+    private Property addConfigEntry(Property property, boolean showInGui, String category) {
         if (showInGui) {
             property.setLanguageKey(Cowmoonication.MODID + ".config." + property.getName());
         } else {
             property.setShowInGui(false);
         }
-        propOrderGeneral.add(property.getName());
+
+        if (CATEGORY_LOGS_SEARCH.equals(category)) {
+            propOrderLogsSearch.add(property.getName());
+        } else {
+            // == Configuration.CATEGORY_CLIENT:
+            propOrderGeneral.add(property.getName());
+        }
         return property;
     }
 
+    private Property addConfigEntry(Property property, boolean showInGui) {
+        return addConfigEntry(property, showInGui, Configuration.CATEGORY_CLIENT);
+    }
+
+    /**
+     * Tries to find/resolve default directories containing minecraft logfiles (in .log.gz format)
+     *
+     * @return list of /logs/ directories
+     */
+    private String[] resolveDefaultLogsDirs() {
+        List<String> logsDirs = new ArrayList<>();
+        File currentMcLogsDirFile = new File(Minecraft.getMinecraft().mcDataDir, "logs");
+        if (currentMcLogsDirFile.exists() && currentMcLogsDirFile.isDirectory()) {
+            String currentMcLogsDir = currentMcLogsDirFile.getAbsolutePath();
+            logsDirs.add(currentMcLogsDir);
+        }
+
+        String defaultMcLogsDir = System.getProperty("user.home");
+        Util.EnumOS osType = Util.getOSType();
+        // default directories for .minecraft: https://minecraft.gamepedia.com/.minecraft
+        switch (osType) {
+            case WINDOWS:
+                defaultMcLogsDir += "\\AppData\\Roaming\\.minecraft\\logs";
+                break;
+            case OSX:
+                defaultMcLogsDir += "/Library/Application Support/minecraft/logs";
+                break;
+            default:
+                defaultMcLogsDir += "/.minecraft/logs";
+        }
+        File defaultMcLogsDirFile = new File(defaultMcLogsDir);
+        if (defaultMcLogsDirFile.exists() && defaultMcLogsDirFile.isDirectory() && !currentMcLogsDirFile.equals(defaultMcLogsDirFile)) {
+            logsDirs.add(defaultMcLogsDirFile.getAbsolutePath());
+        }
+        return logsDirs.toArray(new String[]{});
+    }
+
     /**
      * Should login/logout notifications be modified and thus monitored?
      *
@@ -149,7 +254,7 @@ public class MooConfig {
         @SubscribeEvent(priority = EventPriority.NORMAL)
         public void onEvent(ConfigChangedEvent.OnConfigChangedEvent e) {
             if (Cowmoonication.MODID.equals(e.modID)) {
-                syncFromGUI();
+                syncFromGui();
             }
         }
     }
diff --git a/src/main/java/eu/olli/cowmoonication/config/MooGuiConfig.java b/src/main/java/eu/olli/cowmoonication/config/MooGuiConfig.java
index 4583dc9..7807e03 100644
--- a/src/main/java/eu/olli/cowmoonication/config/MooGuiConfig.java
+++ b/src/main/java/eu/olli/cowmoonication/config/MooGuiConfig.java
@@ -1,33 +1,80 @@
 package eu.olli.cowmoonication.config;
 
 import eu.olli.cowmoonication.Cowmoonication;
+import eu.olli.cowmoonication.search.GuiTooltip;
 import net.minecraft.client.gui.GuiButton;
 import net.minecraft.client.gui.GuiScreen;
+import net.minecraft.client.gui.GuiTextField;
+import net.minecraft.client.resources.I18n;
+import net.minecraft.util.EnumChatFormatting;
 import net.minecraftforge.common.config.ConfigElement;
 import net.minecraftforge.common.config.Configuration;
 import net.minecraftforge.fml.client.config.GuiConfig;
+import net.minecraftforge.fml.client.config.GuiConfigEntries;
+import net.minecraftforge.fml.client.config.IConfigElement;
+import org.apache.commons.lang3.reflect.FieldUtils;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
 
 public class MooGuiConfig extends GuiConfig {
+    private GuiTooltip defaultStartDateTooltip;
+    private GuiTextField textFieldDefaultStartDate;
+    private String defaultStartDateTooltipText;
+
     public MooGuiConfig(GuiScreen parent) {
         super(parent,
-                new ConfigElement(MooConfig.getConfig().getCategory(Configuration.CATEGORY_CLIENT)).getChildElements(),
+                getConfigElements(),
                 Cowmoonication.MODID,
                 false,
                 false,
-                "Configuration for " + Cowmoonication.MODNAME);
-        titleLine2 = MooConfig.getConfig().getConfigFile().getAbsolutePath();
+                EnumChatFormatting.BOLD + "Configuration for " + Cowmoonication.MODNAME);
+        titleLine2 = EnumChatFormatting.GRAY + MooConfig.getConfig().getConfigFile().getAbsolutePath();
+    }
+
+    private static List<IConfigElement> getConfigElements() {
+        List<IConfigElement> list = new ArrayList<>(new ConfigElement(MooConfig.getConfig().getCategory(Configuration.CATEGORY_CLIENT)).getChildElements());
+        list.addAll(new ConfigElement(MooConfig.getConfig().getCategory(MooConfig.CATEGORY_LOGS_SEARCH)).getChildElements());
+        return list;
     }
 
     @Override
     public void initGui() {
         super.initGui();
         // optional: add buttons and initialize fields
+        for (GuiConfigEntries.IConfigEntry configEntry : entryList.listEntries) {
+            if ("defaultStartDate".equals(configEntry.getName()) && configEntry instanceof GuiConfigEntries.StringEntry) {
+                GuiConfigEntries.StringEntry entry = (GuiConfigEntries.StringEntry) configEntry;
+                defaultStartDateTooltipText = I18n.format(configEntry.getConfigElement().getLanguageKey() + ".tooltip");
+                try {
+                    textFieldDefaultStartDate = (GuiTextField) FieldUtils.readField(entry, "textFieldValue", true);
+                    defaultStartDateTooltip = null;
+                } catch (IllegalAccessException e) {
+                    // wasn't able to access textField, abort drawing tooltip
+                    return;
+                }
+            }
+        }
     }
 
     @Override
     public void drawScreen(int mouseX, int mouseY, float partialTicks) {
         super.drawScreen(mouseX, mouseY, partialTicks);
         // optional: create animations, draw additional elements, etc.
+
+        // add tooltip to defaultStartDate textField
+        if (textFieldDefaultStartDate != null) {
+            if (defaultStartDateTooltip == null) {
+                if (textFieldDefaultStartDate.yPosition == 0) {
+                    return;
+                }
+                // create GuiTooltip here instead in initGui because y-position of textField is 0 inside initGui
+                defaultStartDateTooltip = new GuiTooltip(textFieldDefaultStartDate, Arrays.asList(defaultStartDateTooltipText.split("\\\\n")));
+            } else if (defaultStartDateTooltip.checkHover(mouseX, mouseY)) {
+                drawHoveringText(defaultStartDateTooltip.getText(), mouseX, mouseY, fontRendererObj);
+            }
+        }
     }
 
     @Override
diff --git a/src/main/java/eu/olli/cowmoonication/handler/FriendsHandler.java b/src/main/java/eu/olli/cowmoonication/handler/FriendsHandler.java
index 9ec469e..8d714a1 100644
--- a/src/main/java/eu/olli/cowmoonication/handler/FriendsHandler.java
+++ b/src/main/java/eu/olli/cowmoonication/handler/FriendsHandler.java
@@ -148,9 +148,13 @@ public class FriendsHandler {
 
     private void loadBestFriends() {
         try {
+            boolean createdNewFile = this.bestFriendsFile.createNewFile();
+
             this.bestFriends.clear();
-            String bestFriendsData = FileUtils.readFileToString(this.bestFriendsFile, StandardCharsets.UTF_8);
-            this.bestFriends.addAll(parseJson(bestFriendsData));
+            if (!createdNewFile) {
+                String bestFriendsData = FileUtils.readFileToString(this.bestFriendsFile, StandardCharsets.UTF_8);
+                this.bestFriends.addAll(parseJson(bestFriendsData));
+            }
         } catch (IOException e) {
             main.getLogger().error("Couldn't read best friends file " + this.bestFriendsFile, e);
         } catch (JsonParseException e) {
diff --git a/src/main/java/eu/olli/cowmoonication/search/GuiDateField.java b/src/main/java/eu/olli/cowmoonication/search/GuiDateField.java
new file mode 100644
index 0000000..136e4ac
--- /dev/null
+++ b/src/main/java/eu/olli/cowmoonication/search/GuiDateField.java
@@ -0,0 +1,37 @@
+package eu.olli.cowmoonication.search;
+
+import net.minecraft.client.gui.FontRenderer;
+import net.minecraft.client.gui.GuiTextField;
+
+import java.time.LocalDate;
+import java.time.format.DateTimeParseException;
+
+class GuiDateField extends GuiTextField {
+    GuiDateField(int componentId, FontRenderer fontrendererObj, int x, int y, int width, int height) {
+        super(componentId, fontrendererObj, x, y, width, height);
+    }
+
+    LocalDate getDate() {
+        try {
+            return LocalDate.parse(this.getText());
+        } catch (DateTimeParseException e) {
+            return LocalDate.now();
+        }
+    }
+
+    boolean validateDate() {
+        try {
+            LocalDate localDate = LocalDate.parse(this.getText());
+            if (localDate.isAfter(LocalDate.now()) || localDate.isBefore(LocalDate.ofYearDay(2009, 1))) {
+                // searching for things written in the future isn't possible (yet). It is also not possible to perform a search before the existence of mc.
+                setTextColor(0xFFFF3333);
+                return false;
+            }
+        } catch (DateTimeParseException e) {
+            setTextColor(0xFFFF3333);
+            return false;
+        }
+        setTextColor(0xFFFFFF);
+        return true;
+    }
+}
diff --git a/src/main/java/eu/olli/cowmoonication/search/GuiSearch.java b/src/main/java/eu/olli/cowmoonication/search/GuiSearch.java
new file mode 100644
index 0000000..b53aa8c
--- /dev/null
+++ b/src/main/java/eu/olli/cowmoonication/search/GuiSearch.java
@@ -0,0 +1,359 @@
+package eu.olli.cowmoonication.search;
+
+import com.google.common.base.Joiner;
+import eu.olli.cowmoonication.config.MooConfig;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.*;
+import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.util.EnumChatFormatting;
+import net.minecraft.util.IChatComponent;
+import net.minecraftforge.common.ForgeHooks;
+import net.minecraftforge.common.ForgeVersion;
+import net.minecraftforge.fml.client.GuiScrollingList;
+import net.minecraftforge.fml.client.config.GuiButtonExt;
+import net.minecraftforge.fml.client.config.GuiCheckBox;
+import net.minecraftforge.fml.client.config.GuiUtils;
+import org.lwjgl.input.Keyboard;
+
+import java.io.IOException;
+import java.time.LocalDate;
+import java.util.*;
+import java.util.concurrent.Executors;
+
+public class GuiSearch extends GuiScreen {
+    private static final String SEARCH_QUERY_PLACE_HOLDER = "Search for...";
+    // data
+    private String searchQuery;
+    private boolean matchCase;
+    private boolean removeFormatting;
+    /**
+     * Cached results are required after resizing the client
+     */
+    private List<String> searchResults;
+    private LocalDate dateStart;
+    private LocalDate dateEnd;
+
+    // gui elements
+    private GuiButton buttonSearch;
+    private GuiButton buttonClose;
+    private GuiCheckBox checkboxMatchCase;
+    private GuiCheckBox checkboxRemoveFormatting;
+    private GuiTextField fieldSearchQuery;
+    private GuiDateField fieldDateStart;
+    private GuiDateField fieldDateEnd;
+    private SearchResults guiSearchResults;
+    private List<GuiTooltip> guiTooltips;
+    private boolean isSearchInProgress;
+
+    public GuiSearch() {
+        this.searchQuery = SEARCH_QUERY_PLACE_HOLDER;
+        this.matchCase = false;
+        this.searchResults = new ArrayList<>();
+        this.dateStart = MooConfig.calculateStartDate();
+        this.dateEnd = LocalDate.now();
+    }
+
+    /**
+     * Adds the buttons (and other controls) to the screen in question. Called when the GUI is displayed and when the
+     * window resizes, the buttonList is cleared beforehand.
+     */
+    @Override
+    public void initGui() {
+        this.guiTooltips = new ArrayList<>();
+
+        this.fieldSearchQuery = new GuiTextField(42, this.fontRendererObj, this.width / 2 - 100, 15, 200, 20);
+        this.fieldSearchQuery.setMaxStringLength(255);
+        this.fieldSearchQuery.setText(searchQuery);
+        if (SEARCH_QUERY_PLACE_HOLDER.equals(searchQuery)) {
+            this.fieldSearchQuery.setFocused(true);
+            this.fieldSearchQuery.setSelectionPos(0);
+        }
+
+        // date fields
+        this.fieldDateStart = new GuiDateField(50, this.fontRendererObj, this.width / 2 + 110, 15, 70, 15);
+        this.fieldDateStart.setText(dateStart.toString());
+        addTooltip(fieldDateStart, Arrays.asList(EnumChatFormatting.YELLOW + "Start date", "" + EnumChatFormatting.GRAY + EnumChatFormatting.ITALIC + "Format: " + EnumChatFormatting.RESET + "year-month-day"));
+
+        this.fieldDateEnd = new GuiDateField(51, this.fontRendererObj, this.width / 2 + 110, 35, 70, 15);
+        this.fieldDateEnd.setText(dateEnd.toString());
+        addTooltip(fieldDateEnd, Arrays.asList(EnumChatFormatting.YELLOW + "End date", "" + EnumChatFormatting.GRAY + EnumChatFormatting.ITALIC + "Format: " + EnumChatFormatting.RESET + "year-month-day"));
+
+        // buttons
+        this.buttonList.add(this.buttonClose = new GuiButtonExt(0, this.width - 25, 3, 22, 20, EnumChatFormatting.RED + "X"));
+        addTooltip(buttonClose, Arrays.asList(EnumChatFormatting.RED + "Close search interface", "" + EnumChatFormatting.GRAY + EnumChatFormatting.ITALIC + "Hint:" + EnumChatFormatting.RESET + " alternatively press ESC"));
+
+        this.buttonList.add(this.checkboxMatchCase = new GuiCheckBox(1, this.width / 2 - 100, 40, " Match case", matchCase));
+        addTooltip(checkboxMatchCase, Collections.singletonList(EnumChatFormatting.YELLOW + "Should the search be " + EnumChatFormatting.GOLD + "case-sensitive" + EnumChatFormatting.YELLOW + "?"));
+        this.buttonList.add(this.checkboxRemoveFormatting = new GuiCheckBox(1, this.width / 2 - 100, 50, " Remove formatting", removeFormatting));
+        addTooltip(checkboxRemoveFormatting, Collections.singletonList(EnumChatFormatting.YELLOW + "Should " + EnumChatFormatting.GOLD + "formatting " + EnumChatFormatting.YELLOW + "and " + EnumChatFormatting.GOLD + "color codes " + EnumChatFormatting.YELLOW + "be " + EnumChatFormatting.GOLD + "removed " + EnumChatFormatting.YELLOW + "from the search results?"));
+        this.buttonList.add(this.buttonSearch = new GuiButtonExt(100, this.width / 2 + 40, 40, 60, 20, "Search"));
+
+        this.guiSearchResults = new SearchResults(70);
+        this.guiSearchResults.setResults(searchResults);
+
+        this.setIsSearchInProgress(isSearchInProgress);
+
+        boolean isStartDateValid = fieldDateStart.validateDate();
+        boolean isEndDateValid = fieldDateEnd.validateDate();
+        this.buttonSearch.enabled = !isSearchInProgress && this.fieldSearchQuery.getText().trim().length() > 1 && !this.fieldSearchQuery.getText().startsWith(SEARCH_QUERY_PLACE_HOLDER) && isStartDateValid && isEndDateValid && !dateStart.isAfter(dateEnd);
+
+        if (isStartDateValid && isEndDateValid && dateStart.isAfter(dateEnd)) {
+            fieldDateStart.setTextColor(0xFFDD3333);
+            fieldDateEnd.setTextColor(0xFFCC3333);
+        }
+    }
+
+    private <T extends Gui> void addTooltip(T field, List<String> tooltip) {
+        GuiTooltip guiTooltip = new GuiTooltip(field, tooltip);
+        this.guiTooltips.add(guiTooltip);
+    }
+
+    @Override
+    public void updateScreen() {
+        fieldSearchQuery.updateCursorCounter();
+        fieldDateStart.updateCursorCounter();
+        fieldDateEnd.updateCursorCounter();
+    }
+
+    @Override
+    protected void mouseClicked(int mouseX, int mouseY, int mouseButton) throws IOException {
+        // allow clicks on 'close' button even while a search is in progress
+        super.mouseClicked(mouseX, mouseY, mouseButton);
+        if (isSearchInProgress) {
+            // search in progress, abort
+            return;
+        }
+        fieldSearchQuery.mouseClicked(mouseX, mouseY, mouseButton);
+        fieldDateStart.mouseClicked(mouseX, mouseY, mouseButton);
+        fieldDateEnd.mouseClicked(mouseX, mouseY, mouseButton);
+    }
+
+    @Override
+    protected void keyTyped(char typedChar, int keyCode) throws IOException {
+        if (isSearchInProgress && keyCode != Keyboard.KEY_ESCAPE) {
+            // search in progress, don't process key typed - but allow escape to exit gui
+            return;
+        }
+        if (dateStart.isBefore(dateEnd)) {
+            fieldDateStart.setTextColor(0xFFFFFFFF);
+            fieldDateEnd.setTextColor(0xFFFFFFFF);
+        }
+        if (keyCode == Keyboard.KEY_RETURN && this.fieldSearchQuery.isFocused()) {
+            // perform search
+            actionPerformed(buttonSearch);
+        } else if (this.fieldSearchQuery.textboxKeyTyped(typedChar, keyCode)) {
+            searchQuery = this.fieldSearchQuery.getText();
+        } else if (this.fieldDateStart.textboxKeyTyped(typedChar, keyCode)) {
+            if (fieldDateStart.validateDate()) {
+                dateStart = fieldDateStart.getDate();
+            }
+        } else if (this.fieldDateEnd.textboxKeyTyped(typedChar, keyCode)) {
+            if (fieldDateEnd.validateDate()) {
+                dateEnd = fieldDateEnd.getDate();
+            }
+        } else if (GuiScreen.isKeyComboCtrlA(keyCode)) {
+            // copy all search results
+            String searchResults = guiSearchResults.getAllSearchResults();
+            if (!searchResults.isEmpty()) {
+                GuiScreen.setClipboardString(EnumChatFormatting.getTextWithoutFormattingCodes(searchResults));
+            }
+        } else if (GuiScreen.isKeyComboCtrlC(keyCode)) {
+            // copy current selected entry
+            String selectedSearchResult = guiSearchResults.getSelectedSearchResult();
+            if (selectedSearchResult != null) {
+                GuiScreen.setClipboardString(EnumChatFormatting.getTextWithoutFormattingCodes(selectedSearchResult));
+            }
+        } else {
+            super.keyTyped(typedChar, keyCode);
+        }
+
+        boolean isStartDateValid = fieldDateStart.validateDate();
+        boolean isEndDateValid = fieldDateEnd.validateDate();
+        this.buttonSearch.enabled = !isSearchInProgress && searchQuery.trim().length() > 1 && !searchQuery.startsWith(SEARCH_QUERY_PLACE_HOLDER) && isStartDateValid && isEndDateValid && !dateStart.isAfter(dateEnd);
+
+        if (isStartDateValid && isEndDateValid && dateStart.isAfter(dateEnd)) {
+            fieldDateStart.setTextColor(0xFFDD3333);
+            fieldDateEnd.setTextColor(0xFFCC3333);
+        }
+    }
+
+    @Override
+    public void drawScreen(int mouseX, int mouseY, float partialTicks) {
+        this.drawDefaultBackground();
+        this.drawCenteredString(this.fontRendererObj, EnumChatFormatting.BOLD + "Minecraft Log Search", this.width / 2, 3, 0xFFFFFF);
+        this.fieldSearchQuery.drawTextBox();
+        this.fieldDateStart.drawTextBox();
+        this.fieldDateEnd.drawTextBox();
+        this.guiSearchResults.drawScreen(mouseX, mouseY, partialTicks);
+
+        super.drawScreen(mouseX, mouseY, partialTicks);
+
+        for (GuiTooltip guiTooltip : guiTooltips) {
+            if (guiTooltip.checkHover(mouseX, mouseY)) {
+                drawHoveringText(guiTooltip.getText(), mouseX, mouseY, 300);
+                // only one tooltip can be displayed at a time: break!
+                break;
+            }
+        }
+    }
+
+    @Override
+    protected void actionPerformed(GuiButton button) throws IOException {
+        if (button == this.buttonClose && button.enabled) {
+            this.mc.setIngameFocus();
+        }
+        if (isSearchInProgress || !button.enabled) {
+            return;
+        }
+        if (button == this.buttonSearch) {
+            setIsSearchInProgress(true);
+
+            Executors.newSingleThreadExecutor().execute(() -> {
+                searchResults = new LogFilesSearcher().searchFor(this.fieldSearchQuery.getText(), checkboxMatchCase.isChecked(), checkboxRemoveFormatting.isChecked(), dateStart, dateEnd);
+                if (searchResults.isEmpty()) {
+                    searchResults.add(EnumChatFormatting.ITALIC + "No results");
+                }
+                Minecraft.getMinecraft().addScheduledTask(() -> {
+                    this.guiSearchResults.setResults(searchResults);
+                    setIsSearchInProgress(false);
+                });
+            });
+        } else if (button == checkboxMatchCase) {
+            matchCase = checkboxMatchCase.isChecked();
+        } else if (button == checkboxRemoveFormatting) {
+            removeFormatting = checkboxRemoveFormatting.isChecked();
+        }
+    }
+
+    private void setIsSearchInProgress(boolean isSearchInProgress) {
+        this.isSearchInProgress = isSearchInProgress;
+        buttonSearch.enabled = !isSearchInProgress;
+        fieldSearchQuery.setEnabled(!isSearchInProgress);
+        fieldDateStart.setEnabled(!isSearchInProgress);
+        fieldDateEnd.setEnabled(!isSearchInProgress);
+        checkboxRemoveFormatting.enabled = !isSearchInProgress;
+        checkboxMatchCase.enabled = !isSearchInProgress;
+        if (isSearchInProgress) {
+            fieldSearchQuery.setFocused(false);
+            fieldDateStart.setFocused(false);
+            fieldDateEnd.setFocused(false);
+            buttonSearch.displayString = EnumChatFormatting.ITALIC + "Searching";
+            searchResults.clear();
+            this.guiSearchResults.clearResults();
+        } else {
+            buttonSearch.displayString = "Search";
+        }
+    }
+
+    private void drawHoveringText(List<String> textLines, int mouseX, int mouseY, int maxTextWidth) {
+        if (ForgeVersion.getBuildVersion() < 1808) {
+            // we're running a forge version from before 24 March 2016 (http://files.minecraftforge.net/maven/net/minecraftforge/forge/index_1.8.9.html for reference)
+            // using mc built-in method
+            drawHoveringText(textLines, mouseX, mouseY, fontRendererObj);
+        } else {
+            // we're on a newer forge version, so we can use the improved tooltip rendering added in 1.8.9-11.15.1.1808 (released 03/24/16 09:25 PM) in this pull request: https://github.com/MinecraftForge/MinecraftForge/pull/2649
+            GuiUtils.drawHoveringText(textLines, mouseX, mouseY, width, height, maxTextWidth, fontRendererObj);
+        }
+    }
+
+    /**
+     * List gui element similar to GuiModList.Info
+     */
+    class SearchResults extends GuiScrollingList {
+        private final String[] spinner = new String[]{"oooooo", "Oooooo", "oOoooo", "ooOooo", "oooOoo", "ooooOo", "oooooO"};
+        private List<String> rawResults;
+        private List<IChatComponent> slotsData;
+        private NavigableMap<Integer, Integer> searchResultEntries;
+
+        SearchResults(int marginTop) {
+            super(GuiSearch.this.mc,
+                    GuiSearch.this.width - 10, // 5 pixel margin each
+                    GuiSearch.this.height - marginTop - 5,
+                    marginTop, GuiSearch.this.height - 5,
+                    5, 12,
+                    GuiSearch.this.width,
+                    GuiSearch.this.height);
+            this.rawResults = Collections.emptyList();
+            this.slotsData = Collections.emptyList();
+            this.searchResultEntries = Collections.emptyNavigableMap();
+        }
+
+        @Override
+        public void drawScreen(int mouseX, int mouseY, float partialTicks) {
+            super.drawScreen(mouseX, mouseY, partialTicks);
+            if (isSearchInProgress) {
+                // spinner taken from IProgressMeter and GuiAchievements#drawScreen
+                GuiSearch.this.drawCenteredString(GuiSearch.this.fontRendererObj, "Searching for '" + GuiSearch.this.searchQuery + "'", GuiSearch.this.width / 2, GuiSearch.this.height / 2, 16777215);
+                GuiSearch.this.drawCenteredString(GuiSearch.this.fontRendererObj, spinner[(int) (Minecraft.getSystemTime() / 150L % (long) spinner.length)], GuiSearch.this.width / 2, GuiSearch.this.height / 2 + GuiSearch.this.fontRendererObj.FONT_HEIGHT * 2, 16777215);
+            }
+        }
+
+        @Override
+        protected int getSize() {
+            return slotsData.size();
+        }
+
+        @Override
+        protected void elementClicked(int index, boolean doubleClick) {
+        }
+
+        @Override
+        protected boolean isSelected(int index) {
+            return false;
+        }
+
+        @Override
+        protected void drawBackground() {
+
+        }
+
+        @Override
+        protected void drawSlot(int slotIdx, int entryRight, int slotTop, int slotBuffer, Tessellator tess) {
+            if (Objects.equals(searchResultEntries.floorKey(selectedIndex), searchResultEntries.floorKey(slotIdx))) {
+                // highlight all lines of selected entry
+                drawRect(this.left, slotTop - 2, entryRight, slotTop + slotHeight - 2, 0x99000000);
+            }
+            IChatComponent slotData = slotsData.get(slotIdx);
+            if (slotData != null) {
+                GlStateManager.enableBlend();
+                GuiSearch.this.fontRendererObj.drawStringWithShadow(slotData.getFormattedText(), this.left + 4, slotTop, 0xFFFFFF);
+                GlStateManager.disableAlpha();
+                GlStateManager.disableBlend();
+            }
+        }
+
+        private void setResults(List<String> searchResult) {
+            this.rawResults = searchResult;
+            this.slotsData = resizeContent(searchResult);
+        }
+
+        private void clearResults() {
+            this.rawResults = Collections.emptyList();
+            this.slotsData = resizeContent(Collections.emptyList());
+        }
+
+        private List<IChatComponent> resizeContent(List<String> searchResults) {
+            this.searchResultEntries = new TreeMap<>();
+            List<IChatComponent> slotsData = new ArrayList<>();
+            for (int searchResultIndex = 0; searchResultIndex < searchResults.size(); searchResultIndex++) {
+                String searchResult = searchResults.get(searchResultIndex);
+
+                searchResultEntries.put(slotsData.size(), searchResultIndex);
+                IChatComponent chat = ForgeHooks.newChatWithLinks(searchResult, false);
+                List<IChatComponent> multilineResult = GuiUtilRenderComponents.splitText(chat, this.listWidth - 8, GuiSearch.this.fontRendererObj, false, true);
+                slotsData.addAll(multilineResult);
+            }
+            return slotsData;
+        }
+
+        String getSelectedSearchResult() {
+            Map.Entry<Integer, Integer> selectedResultIndex = searchResultEntries.floorEntry(selectedIndex);
+            return (selectedResultIndex != null && selectedResultIndex.getValue() < rawResults.size()) ? rawResults.get(selectedResultIndex.getValue()) : null;
+        }
+
+        String getAllSearchResults() {
+            return Joiner.on('\n').join(rawResults);
+        }
+    }
+}
diff --git a/src/main/java/eu/olli/cowmoonication/search/GuiTooltip.java b/src/main/java/eu/olli/cowmoonication/search/GuiTooltip.java
new file mode 100644
index 0000000..9fed357
--- /dev/null
+++ b/src/main/java/eu/olli/cowmoonication/search/GuiTooltip.java
@@ -0,0 +1,50 @@
+package eu.olli.cowmoonication.search;
+
+import net.minecraft.client.gui.Gui;
+import net.minecraft.client.gui.GuiButton;
+import net.minecraft.client.gui.GuiTextField;
+import net.minecraftforge.fml.client.config.GuiCheckBox;
+import net.minecraftforge.fml.client.config.HoverChecker;
+
+import java.util.List;
+
+public class GuiTooltip {
+    private final HoverChecker hoverChecker;
+    private final List<String> tooltip;
+
+    public <T extends Gui> GuiTooltip(T field, List<String> tooltip) {
+        if (field instanceof GuiCheckBox) {
+            // checkbox
+            GuiCheckBox guiCheckBox = (GuiCheckBox) field;
+            int top = guiCheckBox.yPosition;
+            int bottom = guiCheckBox.yPosition + guiCheckBox.height;
+            int left = guiCheckBox.xPosition;
+            int right = guiCheckBox.xPosition + guiCheckBox.width;
+
+            this.hoverChecker = new HoverChecker(top, bottom, left, right, 300);
+        } else if (field instanceof GuiTextField) {
+            // text field
+            GuiTextField guiTextField = (GuiTextField) field;
+            int top = guiTextField.yPosition;
+            int bottom = guiTextField.yPosition + guiTextField.height;
+            int left = guiTextField.xPosition;
+            int right = guiTextField.xPosition + guiTextField.width;
+
+            this.hoverChecker = new HoverChecker(top, bottom, left, right, 300);
+        } else if (field instanceof GuiButton) {
+            // button
+            this.hoverChecker = new HoverChecker((GuiButton) field, 300);
+        } else {
+            throw new IllegalArgumentException("Tried to add a tooltip to an illegal field type: " + field.getClass());
+        }
+        this.tooltip = tooltip;
+    }
+
+    public List<String> getText() {
+        return tooltip;
+    }
+
+    public boolean checkHover(int mouseX, int mouseY) {
+        return hoverChecker.checkHover(mouseX, mouseY);
+    }
+}
diff --git a/src/main/java/eu/olli/cowmoonication/search/LogFilesSearcher.java b/src/main/java/eu/olli/cowmoonication/search/LogFilesSearcher.java
new file mode 100644
index 0000000..50d7c85
--- /dev/null
+++ b/src/main/java/eu/olli/cowmoonication/search/LogFilesSearcher.java
@@ -0,0 +1,107 @@
+package eu.olli.cowmoonication.search;
+
+import eu.olli.cowmoonication.config.MooConfig;
+import net.minecraft.util.EnumChatFormatting;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.lang3.exception.ExceptionUtils;
+
+import java.io.*;
+import java.nio.file.DirectoryStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Pattern;
+import java.util.zip.GZIPInputStream;
+
+class LogFilesSearcher {
+    private static final Pattern UTF_PARAGRAPH_SYMBOL = Pattern.compile("§");
+
+    List<String> searchFor(String searchQuery, boolean matchCase, boolean removeFormatting, LocalDate dateStart, LocalDate dateEnd) {
+        List<String> files = new ArrayList<>();
+        for (String logsDirPath : MooConfig.logsDirs) {
+            File logsDir = new File(logsDirPath);
+            if (logsDir.exists() && logsDir.isDirectory()) {
+                try {
+                    files.addAll(fileList(logsDir, dateStart, dateEnd));
+                } catch (IOException e) {
+                    return printErrors(logsDirPath, e);
+                }
+            }
+        }
+
+        if (files.isEmpty()) {
+            List<String> errors = new ArrayList<>();
+            errors.add(EnumChatFormatting.DARK_RED + "ERROR: Couldn't find any Minecraft log files. Please check if the log file directories are set correctly (/moo config).");
+            return errors;
+        } else {
+            return analyseFiles(files, searchQuery, matchCase, removeFormatting);
+        }
+    }
+
+    private List<String> analyseFiles(List<String> files, String searchTerm, boolean matchCase, boolean removeFormatting) {
+        List<String> searchResults = new ArrayList<>();
+        for (String file : files) {
+            try (BufferedReader in = new BufferedReader(new InputStreamReader(new GZIPInputStream(new FileInputStream(file))))) {
+                String content;
+                while ((content = in.readLine()) != null) {
+                    String result = analyseLine(content, searchTerm, matchCase);
+                    if (result != null) {
+                        if (result.contains("§")) {
+                            result = UTF_PARAGRAPH_SYMBOL.matcher(result).replaceAll("§");
+                        }
+                        if (removeFormatting) {
+                            result = EnumChatFormatting.getTextWithoutFormattingCodes(result);
+                        }
+                        String date = file.substring(file.lastIndexOf('\\') + 1, file.lastIndexOf('-'));
+                        searchResults.add(EnumChatFormatting.DARK_GRAY + date + " " + EnumChatFormatting.RESET + result);
+                    }
+                }
+            } catch (IOException e) {
+                return printErrors(file, e);
+            }
+        }
+        return searchResults;
+    }
+
+    private String analyseLine(String logLine, String searchTerms, boolean matchCase) {
+        String result = logLine;
+        if (!matchCase) {
+            logLine = logLine.toLowerCase();
+            searchTerms = searchTerms.toLowerCase();
+        }
+        return logLine.contains(searchTerms) ? (result.contains("[Client thread/INFO]: [CHAT]") ? result.substring(40) : result) : null;
+    }
+
+    private List<String> fileList(File directory, LocalDate startDate, LocalDate endDate) throws IOException {
+        List<String> fileNames = new ArrayList<>();
+        try (DirectoryStream<Path> directoryStream = Files.newDirectoryStream(directory.toPath())) {
+            for (Path path : directoryStream) {
+                if (path.toString().endsWith(".log.gz")) {
+                    String[] fileDate = path.getFileName().toString().split("-");
+                    if (fileDate.length == 4) {
+                        LocalDate fileLocalDate = LocalDate.of(Integer.parseInt(fileDate[0]),
+                                Integer.parseInt(fileDate[1]), Integer.parseInt(fileDate[2]));
+
+                        if (fileLocalDate.compareTo(startDate) >= 0 && fileLocalDate.compareTo(endDate) <= 0) {
+                            fileNames.add(path.toString());
+                        }
+                    } else {
+                        System.err.println("Error with " + path.toString());
+                    }
+                }
+            }
+        }
+        return fileNames;
+    }
+
+    private List<String> printErrors(String file, IOException e) {
+        System.err.println("Error reading/parsing file: " + file);
+        e.printStackTrace();
+        List<String> errorMessage = new ArrayList<>();
+        errorMessage.add(EnumChatFormatting.DARK_RED + "ERROR: An error occurred trying to read/parse '" + EnumChatFormatting.RED + file + EnumChatFormatting.DARK_RED + "'");
+        errorMessage.add(StringUtils.replaceEach(ExceptionUtils.getStackTrace(e), new String[]{"\t", "\r\n"}, new String[]{"  ", "\n"}));
+        return errorMessage;
+    }
+}
diff --git a/src/main/java/eu/olli/cowmoonication/util/ApiUtils.java b/src/main/java/eu/olli/cowmoonication/util/ApiUtils.java
index 8515593..317ed80 100644
--- a/src/main/java/eu/olli/cowmoonication/util/ApiUtils.java
+++ b/src/main/java/eu/olli/cowmoonication/util/ApiUtils.java
@@ -28,7 +28,7 @@ public class ApiUtils {
     private static final String STALKING_URL_OFFICIAL = "https://api.hypixel.net/status?key=%s&uuid=%s";
     private static final String SKYBLOCK_STATS_URL_OFFICIAL = "https://api.hypixel.net/skyblock/profiles?key=%s&uuid=%s";
     private static final String STALKING_URL_UNOFFICIAL = "https://api.slothpixel.me/api/players/%s";
-    private static ExecutorService pool = Executors.newCachedThreadPool();
+    private static final ExecutorService pool = Executors.newCachedThreadPool();
 
     private ApiUtils() {
     }
diff --git a/src/main/java/eu/olli/cowmoonication/util/GsonUtils.java b/src/main/java/eu/olli/cowmoonication/util/GsonUtils.java
index 4a723ec..c448e0e 100644
--- a/src/main/java/eu/olli/cowmoonication/util/GsonUtils.java
+++ b/src/main/java/eu/olli/cowmoonication/util/GsonUtils.java
@@ -9,7 +9,7 @@ import java.lang.reflect.Type;
 import java.util.UUID;
 
 public final class GsonUtils {
-    private static Gson gson = new GsonBuilder().registerTypeAdapter(UUID.class, new UUIDTypeAdapter()).create();
+    private static final Gson gson = new GsonBuilder().registerTypeAdapter(UUID.class, new UUIDTypeAdapter()).create();
 
     private GsonUtils() {
     }
diff --git a/src/main/java/eu/olli/cowmoonication/util/VersionChecker.java b/src/main/java/eu/olli/cowmoonication/util/VersionChecker.java
index 1b7503e..902d1e0 100644
--- a/src/main/java/eu/olli/cowmoonication/util/VersionChecker.java
+++ b/src/main/java/eu/olli/cowmoonication/util/VersionChecker.java
@@ -111,12 +111,12 @@ public class VersionChecker {
                     .setChatClickEvent(new ClickEvent(ClickEvent.Action.RUN_COMMAND, "/moo updateHelp"))
                     .setChatHoverEvent(new HoverEvent(HoverEvent.Action.SHOW_TEXT, new ChatComponentText(EnumChatFormatting.YELLOW + "Run " + EnumChatFormatting.GOLD + "/moo updateHelp"))));
 
-            IChatComponent openModsFolder = new ChatComponentText("\n[Open Mods folder]").setChatStyle(new ChatStyle()
+            IChatComponent openModsDirectory = new ChatComponentText("\n[Open Mods directory]").setChatStyle(new ChatStyle()
                     .setColor(EnumChatFormatting.GREEN).setBold(true)
-                    .setChatClickEvent(new ClickEvent(ClickEvent.Action.RUN_COMMAND, "/moo folder"))
-                    .setChatHoverEvent(new HoverEvent(HoverEvent.Action.SHOW_TEXT, new ChatComponentText(EnumChatFormatting.YELLOW + "Open mods folder with command " + EnumChatFormatting.GOLD + "/moo folder\n\u279C Click to open mods folder"))));
+                    .setChatClickEvent(new ClickEvent(ClickEvent.Action.RUN_COMMAND, "/moo directory"))
+                    .setChatHoverEvent(new HoverEvent(HoverEvent.Action.SHOW_TEXT, new ChatComponentText(EnumChatFormatting.YELLOW + "Open mods directory with command " + EnumChatFormatting.GOLD + "/moo directory\n\u279C Click to open mods directory"))));
 
-            statusMsg = text.appendSibling(download).appendSibling(spacer).appendSibling(changelog).appendSibling(spacer).appendSibling(updateInstructions).appendSibling(spacer).appendSibling(openModsFolder);
+            statusMsg = text.appendSibling(download).appendSibling(spacer).appendSibling(changelog).appendSibling(spacer).appendSibling(updateInstructions).appendSibling(spacer).appendSibling(openModsDirectory);
         }
 
         if (statusMsg != null) {
diff --git a/src/main/resources/assets/cowmoonication/lang/en_US.lang b/src/main/resources/assets/cowmoonication/lang/en_US.lang
index f66517c..6b09da2 100644
--- a/src/main/resources/assets/cowmoonication/lang/en_US.lang
+++ b/src/main/resources/assets/cowmoonication/lang/en_US.lang
@@ -8,4 +8,8 @@ cowmoonication.config.showGuildNotifications=Show guild notifications
 cowmoonication.config.showGuildNotifications.tooltip=Set to true to receive guild members' login/logout messages, set to false hide them.
 cowmoonication.config.tabCompletableNamesCommands=Commands with Tab-completable usernames
 cowmoonication.config.tabCompletableNamesCommands.tooltip=List of commands with a username argument that should be Tab-completable.\nRequires game restart to take effect!
-cowmoonication.commands.generic.exception=%s
\ No newline at end of file
+cowmoonication.config.logsDirs=Directories with Minecraft log files
+cowmoonication.config.logsDirs.tooltip=List of directories containing Minecraft log files
+cowmoonication.config.defaultStartDate=Start date for log file search
+cowmoonication.config.defaultStartDate.tooltip=§eCan be either a §6number§e (e.g. "§63§e" means "§6start searching 3 months ago§e"),\n§eor alternatively a §6fixed date §e(§6yyyy-mm-dd§e)
+cowmoonication.commands.generic.exception=%s