Add Replay Editor (for now, trimming only)

src/main/java/com/replaymod/core/utils/Utils.java

@@ -1,17 +1,41 @@
 package com.replaymod.core.utils;
 
-import net.minecraft.client.Minecraft;
+import com.google.common.util.concurrent.FutureCallback;
+import com.google.common.util.concurrent.Futures;
+import de.johni0702.minecraft.gui.GuiRenderer;
+import de.johni0702.minecraft.gui.RenderInfo;
+import de.johni0702.minecraft.gui.container.AbstractGuiScrollable;
+import de.johni0702.minecraft.gui.container.GuiContainer;
+import de.johni0702.minecraft.gui.container.GuiPanel;
+import de.johni0702.minecraft.gui.container.GuiScrollable;
+import de.johni0702.minecraft.gui.element.GuiButton;
+import de.johni0702.minecraft.gui.element.GuiElement;
+import de.johni0702.minecraft.gui.element.GuiLabel;
+import de.johni0702.minecraft.gui.layout.HorizontalLayout;
+import de.johni0702.minecraft.gui.layout.VerticalLayout;
+import de.johni0702.minecraft.gui.popup.GuiInfoPopup;
+import de.johni0702.minecraft.gui.utils.Colors;
+import net.minecraft.client.gui.GuiScreen;
 import net.minecraft.client.network.NetworkPlayerInfo;
 import net.minecraft.client.resources.DefaultPlayerSkin;
+import net.minecraft.crash.CrashReport;
 import net.minecraft.util.ResourceLocation;
+import org.apache.logging.log4j.Logger;
 import org.lwjgl.input.Keyboard;
 import org.lwjgl.util.Dimension;
 import org.lwjgl.util.ReadableDimension;
 
+import javax.annotation.Nullable;
 import javax.imageio.ImageIO;
 import java.awt.image.BufferedImage;
+import java.io.File;
+import java.text.SimpleDateFormat;
+import java.util.Arrays;
+import java.util.Date;
 import java.util.UUID;
 
+import static net.minecraft.client.Minecraft.getMinecraft;
+
 public class Utils {
 
     public static final BufferedImage DEFAULT_THUMBNAIL;
@@ -63,7 +87,7 @@ public class Utils {
     }
 
     public static ResourceLocation getResourceLocationForPlayerUUID(UUID uuid) {
-        NetworkPlayerInfo info = Minecraft.getMinecraft().getNetHandler().getPlayerInfo(uuid);
+        NetworkPlayerInfo info = getMinecraft().getNetHandler().getPlayerInfo(uuid);
         ResourceLocation skinLocation;
         if (info != null && info.hasLocationSkin()) {
             skinLocation = info.getLocationSkin();
@@ -76,4 +100,80 @@ public class Utils {
     public static boolean isCtrlDown() {
         return Keyboard.isKeyDown(Keyboard.KEY_LCONTROL) || Keyboard.isKeyDown(Keyboard.KEY_RCONTROL);
     }
+
+    public static GuiInfoPopup error(Logger logger, GuiContainer container, CrashReport crashReport, Runnable onClose) {
+        // Convert crash report to string
+        String crashReportStr = crashReport.getCompleteReport();
+
+        // Log via logger
+        logger.error(crashReportStr);
+
+        // Try to save the crash report
+        if (crashReport.getFile() == null) {
+            try {
+                File folder = new File(getMinecraft().mcDataDir, "crash-reports");
+                File file = new File(folder, "crash-" + (new SimpleDateFormat("yyyy-MM-dd_HH.mm.ss")).format(new Date()) + "-client.txt");
+                logger.debug("Saving crash report to file: {}", file);
+                crashReport.saveToFile(file);
+            } catch (Throwable t) {
+                logger.error("Saving crash report file:", t);
+            }
+        } else {
+            logger.debug("Not saving crash report as file already exists: {}", crashReport.getFile());
+        }
+
+        logger.trace("Opening crash report popup GUI");
+        GuiCrashReportPopup popup = new GuiCrashReportPopup(container, crashReportStr);
+        Futures.addCallback(popup.getFuture(), new FutureCallback<Void>() {
+            @Override
+            public void onSuccess(@Nullable Void result) {
+                logger.trace("Crash report popup closed");
+                if (onClose != null) {
+                    onClose.run();
+                }
+            }
+
+            @Override
+            public void onFailure(Throwable t) {
+                logger.error("During error popup:", t);
+            }
+        });
+        return popup;
+    }
+
+    private static class GuiCrashReportPopup extends GuiInfoPopup {
+        private final GuiScrollable scrollable;
+
+        public GuiCrashReportPopup(GuiContainer container, String crashReport) {
+            super(container);
+            setBackgroundColor(Colors.DARK_TRANSPARENT);
+
+            // Add crash report to scrollable info
+            getInfo().addElements(new VerticalLayout.Data(0.5),
+                    new GuiLabel().setColor(Colors.BLACK).setI18nText("replaymod.gui.unknownerror"),
+                    scrollable = new GuiScrollable().setScrollDirection(AbstractGuiScrollable.Direction.VERTICAL)
+                            .setLayout(new VerticalLayout().setSpacing(2))
+                            .addElements(null,Arrays.stream(crashReport.replace("\t", "    ").split("\n")).map(
+                                    l -> new GuiLabel().setText(l).setColor(Colors.BLACK)).toArray(GuiElement[]::new)));
+
+            // Replace close button with panel containing close and copy buttons
+            GuiButton copyToClipboardButton = new GuiButton().setI18nLabel("chat.copy").onClick(() ->
+                    GuiScreen.setClipboardString(crashReport)).setSize(150, 20);
+            GuiButton closeButton = getCloseButton();
+            popup.removeElement(closeButton);
+            popup.addElements(new VerticalLayout.Data(1),
+                    new GuiPanel().setLayout(new HorizontalLayout().setSpacing(5)).setSize(305, 20)
+                            .addElements(null, copyToClipboardButton, closeButton));
+
+            // And open it
+            open();
+        }
+
+        @Override
+        public void draw(GuiRenderer renderer, ReadableDimension size, RenderInfo renderInfo) {
+            // Re-size the scrollable containing the crash report to 3/4 of the screen
+            scrollable.setSize(size.getWidth() * 3 / 4, size.getHeight() * 3 / 4);
+            super.draw(renderer, size, renderInfo);
+        }
+    }
 }

src/main/java/com/replaymod/editor/ReplayModEditor.java

@@ -0,0 +1,38 @@
+package com.replaymod.editor;
+
+import com.replaymod.core.ReplayMod;
+import com.replaymod.editor.handler.GuiHandler;
+import com.replaymod.online.Setting;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.common.event.FMLInitializationEvent;
+import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
+import org.apache.logging.log4j.Logger;
+
+@Mod(modid = ReplayModEditor.MOD_ID, useMetadata = true)
+public class ReplayModEditor {
+    public static final String MOD_ID = "replaymod-editor";
+
+    @Mod.Instance(MOD_ID)
+    public static ReplayModEditor instance;
+
+    @Mod.Instance(ReplayMod.MOD_ID)
+    private static ReplayMod core;
+
+    public static Logger LOGGER;
+
+    @Mod.EventHandler
+    public void preInit(FMLPreInitializationEvent event) {
+        ReplayModEditor.LOGGER = event.getModLog();
+
+        core.getSettingsRegistry().register(Setting.class);
+    }
+
+    @Mod.EventHandler
+    public void init(FMLInitializationEvent event) {
+        new GuiHandler(this).register();
+    }
+
+    public ReplayMod getCore() {
+        return core;
+    }
+}

src/main/java/com/replaymod/editor/gui/GuiReplayEditor.java

@@ -0,0 +1,360 @@
+package com.replaymod.editor.gui;
+
+import com.google.common.util.concurrent.FutureCallback;
+import com.google.common.util.concurrent.Futures;
+import com.google.gson.JsonObject;
+import com.replaymod.core.ReplayMod;
+import com.replaymod.core.utils.Utils;
+import com.replaymod.replaystudio.PacketData;
+import com.replaymod.replaystudio.Studio;
+import com.replaymod.replaystudio.filter.StreamFilter;
+import com.replaymod.replaystudio.io.ReplayInputStream;
+import com.replaymod.replaystudio.io.ReplayOutputStream;
+import com.replaymod.replaystudio.replay.ReplayFile;
+import com.replaymod.replaystudio.replay.ReplayMetaData;
+import com.replaymod.replaystudio.replay.ZipReplayFile;
+import com.replaymod.replaystudio.stream.PacketStream;
+import com.replaymod.replaystudio.studio.ReplayStudio;
+import de.johni0702.minecraft.gui.GuiRenderer;
+import de.johni0702.minecraft.gui.RenderInfo;
+import de.johni0702.minecraft.gui.container.GuiContainer;
+import de.johni0702.minecraft.gui.container.GuiPanel;
+import de.johni0702.minecraft.gui.container.GuiScreen;
+import de.johni0702.minecraft.gui.element.GuiButton;
+import de.johni0702.minecraft.gui.element.GuiLabel;
+import de.johni0702.minecraft.gui.element.GuiTextField;
+import de.johni0702.minecraft.gui.element.GuiTooltip;
+import de.johni0702.minecraft.gui.element.advanced.GuiProgressBar;
+import de.johni0702.minecraft.gui.layout.CustomLayout;
+import de.johni0702.minecraft.gui.layout.GridLayout;
+import de.johni0702.minecraft.gui.layout.HorizontalLayout;
+import de.johni0702.minecraft.gui.layout.VerticalLayout;
+import de.johni0702.minecraft.gui.popup.AbstractGuiPopup;
+import de.johni0702.minecraft.gui.popup.GuiInfoPopup;
+import de.johni0702.minecraft.gui.popup.GuiYesNoPopup;
+import de.johni0702.minecraft.gui.utils.Colors;
+import net.minecraft.crash.CrashReport;
+import org.apache.commons.io.FilenameUtils;
+import org.lwjgl.util.ReadableDimension;
+
+import javax.annotation.Nullable;
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Consumer;
+import java.util.function.Supplier;
+
+import static com.replaymod.editor.ReplayModEditor.LOGGER;
+
+public class GuiReplayEditor extends GuiScreen {
+    private final ReplayMod mod;
+
+    private volatile ProcessingStage processingStage;
+    private volatile double progress;
+    private GuiProcessingProgressPopup popup;
+
+    public GuiButton currentTabButton;
+    public GuiPanel currentTabPanel;
+
+    public final GuiPanel tabButtons = new GuiPanel(this).setLayout(new GridLayout().setSpacingX(5));
+    public final List<GuiPanel> tabPanels = new ArrayList<>();
+
+    public final GuiButton saveButton = new GuiButton().setI18nLabel("replaymod.gui.save").setSize(100, 20);
+    public final GuiButton backButton = new GuiButton().setI18nLabel("replaymod.gui.back").setSize(100, 20);
+
+    public final GuiPanel buttonPanel = new GuiPanel(this).setLayout(new HorizontalLayout().setSpacing(5))
+            .addElements(null, saveButton, backButton);
+
+    public GuiReplayEditor(GuiScreen parent, ReplayMod mod) {
+        this.mod = mod;
+        backButton.onClick(parent::display);
+
+        setTitle(new GuiLabel().setI18nText("replaymod.gui.replayeditor"));
+
+        makeTab("trim", () -> new GuiTrimPanel(this));
+        makeTab("connect", GuiPanel::new).setDisabled(); // Not yet implemented
+        makeTab("modify", GuiPanel::new).setDisabled(); // Not yet implemented
+
+        setLayout(new CustomLayout<GuiScreen>() {
+            @Override
+            protected void layout(GuiScreen container, int width, int height) {
+                // Move all inactive panels aside
+                tabPanels.forEach(e -> pos(e, Integer.MIN_VALUE, Integer.MIN_VALUE));
+
+                pos(buttonPanel, width - 10 - width(buttonPanel), height - 10 - height(buttonPanel));
+
+                if (currentTabPanel != null) {
+                    pos(currentTabPanel, 10, 50);
+                    size(currentTabPanel, width - 20, y(buttonPanel) - 10 - y(currentTabPanel));
+                }
+
+                pos(tabButtons, 10, 20);
+                size(tabButtons, width - 20, 20);
+            }
+        });
+    }
+
+    public GuiButton makeTab(String name, Supplier<GuiPanel> panel) {
+        GuiButton button =  new GuiButton().setI18nLabel("replaymod.gui.editor." + name + ".title")
+                .setTooltip(new GuiTooltip().setI18nText("replaymod.gui.editor." + name + ".description"))
+                .setSize(Integer.MAX_VALUE, Integer.MAX_VALUE);
+        button.onClick(() -> {
+            // Remove previous tab
+            if (currentTabButton != null) {
+                currentTabButton.setEnabled();
+                removeElement(currentTabPanel);
+            }
+
+            // Activate new tab
+            currentTabButton = button.setDisabled();
+            addElements(null, currentTabPanel = panel.get());
+        });
+        // Add new tab button to tabs panel
+        tabButtons.addElements(null, button);
+        ((GridLayout) tabButtons.getLayout()).setColumns(tabButtons.getChildren().size());
+        return button;
+    }
+
+    public void save(File inputFile, PacketStream.FilterInfo...filters) {
+        save(FilenameUtils.getBaseName(inputFile.getName()), (outputFile) -> {
+            Studio studio = new ReplayStudio();
+            try (ReplayFile outputReplay = new ZipReplayFile(studio, inputFile, outputFile);
+                 ReplayOutputStream out = outputReplay.writePacketData()) {
+                // The input replay file MUST be closed before saving the output file
+                try (ReplayFile inputReplay = new ZipReplayFile(studio, inputFile);
+                     ReplayInputStream in = inputReplay.getPacketData()) {
+                    ReplayMetaData metaData = inputReplay.getMetaData();
+                    PacketStream stream = studio.createReplayStream(in, true);
+
+                    stream.addFilter(new ProgressFilter(metaData.getDuration()));
+                    for (PacketStream.FilterInfo info : filters) {
+                        stream.addFilter(info.getFilter(), info.getFrom(), info.getTo());
+                        LOGGER.debug("Added filter {}", info);
+                    }
+
+                    LOGGER.info("Built pipeline: {}", stream);
+                    stream.start();
+
+                    long lastTimestamp = 0;
+
+                    PacketData data;
+                    while ((data = stream.next()) != null) {
+                        out.write(data);
+                        lastTimestamp = data.getTime();
+                    }
+
+                    for (PacketData d : stream.end()) {
+                        out.write(d);
+                        lastTimestamp = d.getTime();
+                    }
+
+                    updateProgress(ProcessingStage.FINALIZING, 0);
+
+                    // Update duration of new replay
+                    metaData.setDuration((int) lastTimestamp);
+                    outputReplay.writeMetaData(metaData);
+                }
+                out.close();
+                outputReplay.save();
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        });
+    }
+
+    public void save(String sourceName, Consumer<File> runnable) {
+        GuiTextField nameField = new GuiTextField().setSize(200, 20).setFocused(true).setText(sourceName);
+        GuiYesNoPopup popup = GuiYesNoPopup.open(this,
+                nameField
+        ).setYesI18nLabel("replaymod.gui.editor.savemode.override").setNoI18nLabel("replaymod.gui.cancel");
+        nameField.onEnter(() -> {
+            if (popup.getYesButton().isEnabled()) {
+                popup.getYesButton().onClick();
+            }
+        }).onTextChanged(obj -> {
+            popup.getYesButton().setEnabled(!nameField.getText().isEmpty());
+            popup.setYesI18nLabel("replaymod.gui.editor.savemode." +
+                    (nameField.getText().equals(sourceName) ? "override" : "newfile"));
+        });
+        Futures.addCallback(popup.getFuture(), new FutureCallback<Boolean>() {
+            @Override
+            public void onSuccess(@Nullable Boolean result) {
+                if (result == Boolean.TRUE) {
+                    // Sanitize their input
+                    String name = nameField.getText().trim().replace("[^a-zA-Z0-9\\.\\- ]", "_");
+                    // This file is what they want
+                    File replayFolder;
+                    try {
+                        replayFolder = mod.getReplayFolder();
+                    } catch (IOException e) {
+                        Utils.error(LOGGER, GuiReplayEditor.this, CrashReport.makeCrashReport(e, "Getting replay folder"), null);
+                        return;
+                    }
+                    File targetFile = new File(replayFolder, name + ".mcpr");
+                    if (targetFile.exists()) {
+                        LOGGER.trace("Selected file already exists, asking for confirmation");
+                        Futures.addCallback(GuiYesNoPopup.open(GuiReplayEditor.this,
+                                new GuiLabel().setColor(Colors.BLACK)
+                                        .setI18nText("replaymod.gui.replaymodified.warning1", name),
+                                new GuiLabel().setColor(Colors.BLACK)
+                                        .setI18nText("replaymod.gui.replaymodified.warning2"))
+                                .setYesI18nLabel("gui.yes").setNoI18nLabel("gui.no")
+                                .getFuture(), new FutureCallback<Boolean>() {
+                            @Override
+                            public void onSuccess(@Nullable Boolean result) {
+                                if (result == Boolean.TRUE) {
+                                    LOGGER.trace("Saving output in {}", targetFile);
+                                    runEdit(() -> runnable.accept(targetFile));
+                                } else {
+                                    LOGGER.trace("Not overwriting file {}, reopening naming dialog", targetFile);
+                                    save(sourceName, runnable);
+                                }
+                            }
+
+                            @Override
+                            public void onFailure(Throwable t) {
+                                LOGGER.error("During save file confirmation dialog:", t);
+                            }
+                        });
+                    } else {
+                        LOGGER.trace("Saving output in {}", targetFile);
+                        runEdit(() -> runnable.accept(targetFile));
+                    }
+                } else {
+                    LOGGER.trace("Saving cancelled");
+                }
+            }
+
+            @Override
+            public void onFailure(Throwable t) {
+                LOGGER.error("During save file dialog:", t);
+            }
+        });
+    }
+
+    public void runEdit(Runnable runnable) {
+        popup = new GuiProcessingProgressPopup(this);
+        processingStage = ProcessingStage.INITIALIZING;
+        progress = 0;
+        new Thread(() -> {
+            LOGGER.info("Starting editing of replay");
+            try {
+                runnable.run();
+            } catch (Throwable t) {
+                CrashReport crashReport = CrashReport.makeCrashReport(t, "Editing replay file");
+                mod.runLater(() -> Utils.error(LOGGER, this, crashReport, popup::close));
+                return;
+            }
+            LOGGER.info("Successfully finished editing");
+            mod.runLater(() -> {
+                popup.close();
+                GuiInfoPopup.open(this, "replaymod.gui.editor.progress.status.finished");
+            });
+        }).start();
+    }
+
+    public void updateProgress(ProcessingStage stage, double progress) {
+        if (this.processingStage != stage) {
+            LOGGER.trace("Changing state from {} to {}", this.processingStage, stage);
+        }
+        this.processingStage = stage;
+        this.progress = progress;
+    }
+
+    public ReplayMod getMod() {
+        return mod;
+    }
+
+    public enum ProcessingStage {
+        INITIALIZING("initializing", 0.01),
+        WORKING("writing.raw", 0.89),
+        FINALIZING("writing.final", 0.1),
+        DONE("finished", 0);
+
+        private final String i18nKey;
+        private final double progressFraction;
+
+        ProcessingStage(String i18nKey, double progressFraction) {
+            this.i18nKey = "replaymod.gui.editor.progress.status." + i18nKey;
+            this.progressFraction = progressFraction;
+        }
+
+        public double getOverallProgress(double progress) {
+            progress *= progressFraction;
+            for (ProcessingStage processingStage : values()) {
+                if (processingStage == this) break;
+                progress += processingStage.progressFraction;
+            }
+            return progress;
+        }
+    }
+
+    private class ProgressFilter implements StreamFilter {
+        private final long total;
+
+        public ProgressFilter(long total) {
+            this.total = total;
+        }
+
+        @Override
+        public String getName() {
+            return "progress";
+        }
+
+        @Override
+        public void init(Studio studio, JsonObject config) {
+
+        }
+
+        @Override
+        public void onStart(PacketStream stream) {
+            updateProgress(ProcessingStage.WORKING, 0);
+        }
+
+        @Override
+        public boolean onPacket(PacketStream stream, PacketData data) {
+            updateProgress(ProcessingStage.WORKING, (double) data.getTime() / total);
+            return true;
+        }
+
+        @Override
+        public void onEnd(PacketStream stream, long timestamp) {}
+    }
+
+    private class GuiProcessingProgressPopup extends AbstractGuiPopup<GuiProcessingProgressPopup> {
+        private final GuiProgressBar progressBar = new GuiProgressBar().setSize(300, 20);
+
+        {
+            popup.setLayout(new VerticalLayout().setSpacing(10));
+            popup.addElements(new VerticalLayout.Data(0.5),
+                    new GuiLabel().setI18nText("replaymod.gui.editor.progress.title").setColor(Colors.BLACK),
+                    new GuiLabel().setI18nText("replaymod.gui.editor.progress.pleasewait").setColor(Colors.BLACK),
+                    progressBar);
+        }
+
+        public GuiProcessingProgressPopup(GuiContainer container) {
+            super(container);
+            open();
+        }
+
+        @Override
+        public void draw(GuiRenderer renderer, ReadableDimension size, RenderInfo renderInfo) {
+            // Update progress bar
+            progressBar.setI18nLabel(processingStage.i18nKey);
+            progressBar.setProgress((float) processingStage.getOverallProgress(progress));
+
+            super.draw(renderer, size, renderInfo);
+        }
+
+        @Override
+        public void close() {
+            super.close();
+        }
+
+        @Override
+        protected GuiProcessingProgressPopup getThis() {
+            return this;
+        }
+    }
+}

src/main/java/com/replaymod/editor/gui/GuiTrimPanel.java

@@ -0,0 +1,198 @@
+package com.replaymod.editor.gui;
+
+import com.google.gson.JsonObject;
+import com.replaymod.core.utils.Utils;
+import com.replaymod.replaystudio.data.Marker;
+import com.replaymod.replaystudio.filter.ChangeTimestampFilter;
+import com.replaymod.replaystudio.filter.RemoveFilter;
+import com.replaymod.replaystudio.filter.SquashFilter;
+import com.replaymod.replaystudio.replay.ReplayFile;
+import com.replaymod.replaystudio.replay.ReplayMetaData;
+import com.replaymod.replaystudio.replay.ZipReplayFile;
+import com.replaymod.replaystudio.stream.PacketStream;
+import com.replaymod.replaystudio.studio.ReplayStudio;
+import de.johni0702.minecraft.gui.container.GuiPanel;
+import de.johni0702.minecraft.gui.element.GuiLabel;
+import de.johni0702.minecraft.gui.element.GuiNumberField;
+import de.johni0702.minecraft.gui.element.advanced.GuiDropdownMenu;
+import de.johni0702.minecraft.gui.layout.GridLayout;
+import de.johni0702.minecraft.gui.layout.HorizontalLayout;
+import de.johni0702.minecraft.gui.layout.VerticalLayout;
+import net.minecraft.client.resources.I18n;
+import net.minecraft.crash.CrashReport;
+import org.apache.commons.io.FilenameUtils;
+import org.apache.commons.io.IOCase;
+import org.apache.commons.io.filefilter.SuffixFileFilter;
+import org.lwjgl.util.Dimension;
+
+import java.io.File;
+import java.io.FileFilter;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Set;
+import java.util.function.Function;
+
+import static com.replaymod.editor.ReplayModEditor.LOGGER;
+import static java.util.Optional.ofNullable;
+
+public class GuiTrimPanel extends GuiPanel {
+    // Special value indicating no replay files were found
+    private static final File NO_REPLAY = new File(".");
+    // Special value for the initial "Select Marker Keyframe" entry
+    private static final Marker NO_MARKER = new Marker(); static {NO_MARKER.setTime(-1);}
+
+    private final GuiReplayEditor gui;
+
+    public final GuiDropdownMenu<File> inputReplays = new GuiDropdownMenu<File>(this)
+            .setMinSize(new Dimension(200, 20)).onSelection(i -> updateSelectedReplay())
+            .setToString(f -> f == NO_REPLAY ? "" : FilenameUtils.getBaseName(f.getName()));
+
+    public final GuiNumberField startHour = new GuiNumberField().setSize(20, 20).setMaxLength(2);
+    public final GuiNumberField startMin = new GuiNumberField().setSize(20, 20).setMaxLength(2);
+    public final GuiNumberField startSec = new GuiNumberField().setSize(20, 20).setMaxLength(2);
+    public final GuiNumberField startMilli = new GuiNumberField().setSize(40, 20).setMaxLength(4);
+    public final GuiDropdownMenu<Marker> startMarker = new GuiDropdownMenu<>();
+
+    public final GuiNumberField endHour = new GuiNumberField().setSize(20, 20).setMaxLength(2);
+    public final GuiNumberField endMin = new GuiNumberField().setSize(20, 20).setMaxLength(2);
+    public final GuiNumberField endSec = new GuiNumberField().setSize(20, 20).setMaxLength(2);
+    public final GuiNumberField endMilli = new GuiNumberField().setSize(40, 20).setMaxLength(4);
+    public final GuiDropdownMenu<Marker> endMarker = new GuiDropdownMenu<>();
+
+    public final GuiPanel timePanel = new GuiPanel(this)
+            .setLayout(new GridLayout().setCellsEqualSize(false).setSpacingX(20).setSpacingY(5).setColumns(3))
+            .addElements(new GridLayout.Data(0, 0.5),
+                    new GuiLabel().setI18nText("replaymod.gui.start"),
+                    new GuiPanel().setLayout(new HorizontalLayout().setSpacing(2)).addElements(
+                            new HorizontalLayout.Data(0.5),
+                            startHour, new GuiLabel().setI18nText("replaymod.gui.hours"),
+                            startMin, new GuiLabel().setI18nText("replaymod.gui.minutes"),
+                            startSec, new GuiLabel().setI18nText("replaymod.gui.seconds"),
+                            startMilli, new GuiLabel().setI18nText("replaymod.gui.milliseconds")
+                    ), startMarker,
+                    new GuiLabel().setI18nText("replaymod.gui.end"),
+                    new GuiPanel().setLayout(new HorizontalLayout().setSpacing(2)).addElements(
+                            new HorizontalLayout.Data(0.5),
+                            endHour, new GuiLabel().setI18nText("replaymod.gui.hours"),
+                            endMin, new GuiLabel().setI18nText("replaymod.gui.minutes"),
+                            endSec, new GuiLabel().setI18nText("replaymod.gui.seconds"),
+                            endMilli, new GuiLabel().setI18nText("replaymod.gui.milliseconds")
+                    ), endMarker);
+
+    public GuiTrimPanel(GuiReplayEditor gui) {
+        this.gui = gui;
+
+        setLayout(new VerticalLayout().setSpacing(10));
+
+        Function<Marker, String> toString = m -> {
+            if (m == NO_MARKER) {
+                return I18n.format("replaymod.gui.editor.trim.marker");
+            } else {
+                return ofNullable(m.getName()).orElse(I18n.format("replaymod.gui.ingame.unnamedmarker"))
+                        + " (" + Utils.convertSecondsToShortString(m.getTime() / 1000) + ")";
+            }
+        };
+        startMarker.setToString(toString).setMinSize(new Dimension(100, 20)).onSelection(i ->
+                onSelectedMarkerChanged(startMarker, startHour, startMin, startSec, startMilli));
+        endMarker.setToString(toString).setMinSize(new Dimension(100, 20)).onSelection(i ->
+                onSelectedMarkerChanged(endMarker, endHour, endMin, endSec, endMilli));
+
+        File[] files = null;
+        try {
+            File folder = gui.getMod().getReplayFolder();
+            files = folder.listFiles((FileFilter) new SuffixFileFilter(".mcpr", IOCase.INSENSITIVE));
+        } catch (IOException e) {
+            Utils.error(LOGGER, gui, CrashReport.makeCrashReport(e, "Listing available replays"), gui.backButton::onClick);
+        }
+        if (files == null) {
+            LOGGER.warn("Replay file list is null, has the replay folder been deleted?");
+            files = new File[0];
+        } else {
+            LOGGER.debug("Found {} replays in the replay folder", files.length);
+        }
+        if (files.length == 0) {
+            inputReplays.setValues(NO_REPLAY);
+        } else {
+            inputReplays.setValues(files);
+        }
+
+        updateSelectedReplay();
+        updateReadyState();
+
+        gui.saveButton.onClick(() -> {
+            // Read start and end times
+            int start = ((startHour.getInteger() * 60 + startMin.getInteger()) * 60 + startSec.getInteger()) * 1000 + startMilli.getInteger();
+            int end = ((endHour.getInteger() * 60 + endMin.getInteger()) * 60 + endSec.getInteger()) * 1000 + endMilli.getInteger();
+            // Configure offset of change timestamp filter
+            ChangeTimestampFilter ctf = new ChangeTimestampFilter();
+            JsonObject config = new JsonObject();
+            config.addProperty("offset", -start);
+            ctf.init(null, config);
+            // Pass filters to save dialog
+            gui.save(inputReplays.getSelectedValue(),
+                    new PacketStream.FilterInfo(new SquashFilter(), -1, start),
+                    new PacketStream.FilterInfo(ctf, start, end),
+                    new PacketStream.FilterInfo(new RemoveFilter(), end, -1)
+            );
+        });
+    }
+
+    private void onSelectedMarkerChanged(GuiDropdownMenu<Marker> dropdown, GuiNumberField hour, GuiNumberField min,
+                                         GuiNumberField sec, GuiNumberField milli) {
+        Marker marker = dropdown.getSelectedValue();
+        if (marker != NO_MARKER) {
+            int time = marker.getTime();
+            setTime(time, hour, min, sec, milli);
+        }
+    }
+
+    private void setTime(int time, GuiNumberField hour, GuiNumberField min,
+                                         GuiNumberField sec, GuiNumberField milli) {
+        milli.setValue(time % 1000); time /= 1000;
+        sec.setValue(time % 60); time /= 60;
+        min.setValue(time % 60); time /= 60;
+        hour.setValue(time);
+    }
+
+    private void updateSelectedReplay() {
+        File file = inputReplays.getSelectedValue();
+        // Load markers and meta data from replay file
+        ReplayMetaData metaData;
+        Set<Marker> markers;
+        if (file == NO_REPLAY) {
+            metaData = new ReplayMetaData();
+            markers = Collections.emptySet();
+        } else {
+            try (ReplayFile replayFile = new ZipReplayFile(new ReplayStudio(), file)) {
+                metaData = replayFile.getMetaData();
+                markers = replayFile.getMarkers().or(Collections.emptySet());
+                LOGGER.debug("Loaded {} markers from replay {}", markers.size(), file);
+            } catch (Exception e) {
+                Utils.error(LOGGER, gui, CrashReport.makeCrashReport(e, "Reading markers from replay"), null);
+                metaData = new ReplayMetaData();
+                markers = Collections.emptySet();
+            }
+        }
+
+        // Sort and add initial "Select Event Marker" element
+        List<Marker> markerList = new ArrayList<>(markers);
+        markerList.sort(Comparator.comparing(Marker::getTime));
+        markerList.add(0, NO_MARKER);
+
+        // Set marker dropdown values
+        Marker[] markerArray = markerList.stream().toArray(Marker[]::new);
+        startMarker.setValues(markerArray).setSelected(0);
+        endMarker.setValues(markerArray).setSelected(0);
+
+        // Set start and end time values
+        setTime(0, startHour, startMin, startSec, startMilli);
+        setTime(metaData.getDuration(), endHour, endMin, endSec, endMilli);
+    }
+
+    private void updateReadyState() {
+        gui.saveButton.setEnabled(inputReplays.getSelectedValue() != NO_REPLAY);
+    }
+}

src/main/java/com/replaymod/editor/handler/GuiHandler.java

@@ -0,0 +1,54 @@
+package com.replaymod.editor.handler;
+
+import com.replaymod.editor.ReplayModEditor;
+import com.replaymod.editor.gui.GuiReplayEditor;
+import de.johni0702.minecraft.gui.container.GuiScreen;
+import net.minecraft.client.gui.GuiButton;
+import net.minecraft.client.gui.GuiMainMenu;
+import net.minecraft.client.resources.I18n;
+import net.minecraftforge.client.event.GuiScreenEvent;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.fml.common.FMLCommonHandler;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
+
+import java.util.List;
+
+public class GuiHandler {
+    private static final int BUTTON_REPLAY_EDITOR = 17890237;
+
+    private final ReplayModEditor mod;
+
+    public GuiHandler(ReplayModEditor mod) {
+        this.mod = mod;
+    }
+
+    public void register() {
+        FMLCommonHandler.instance().bus().register(this);
+        MinecraftForge.EVENT_BUS.register(this);
+    }
+
+    @SubscribeEvent
+    public void injectIntoMainMenu(GuiScreenEvent.InitGuiEvent event) {
+        if (!(event.gui instanceof GuiMainMenu)) {
+            return;
+        }
+
+        @SuppressWarnings("unchecked")
+        List<GuiButton> buttonList = event.buttonList;
+        GuiButton button = new GuiButton(BUTTON_REPLAY_EDITOR, event.gui.width / 2 + 2,
+                event.gui.height / 4 + 10 + 3 * 24, I18n.format("replaymod.gui.replayeditor"));
+        button.width = button.width / 2 - 2;
+        buttonList.add(button);
+    }
+
+    @SubscribeEvent
+    public void onButton(GuiScreenEvent.ActionPerformedEvent.Pre event) {
+        if(!event.button.enabled) return;
+
+        if (event.gui instanceof GuiMainMenu) {
+            if (event.button.id == BUTTON_REPLAY_EDITOR) {
+                new GuiReplayEditor(GuiScreen.wrap(event.gui), mod.getCore()).display();
+            }
+        }
+    }
+}