Use screen buffer for terminal rendering

.gitea/workflows/android.yaml

@@ -1,4 +1,4 @@
-name: Gitea Android APK
+name: Gitea Android Compile Check
 
 on: [push]
 
@@ -6,7 +6,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - name: Build APK
+      - name: Compile Android APK
         env:
           CLONE_TOKEN: ${{ secrets.TMUX_GITEA_TOKEN }}
         run: |
@@ -62,6 +62,8 @@ jobs:
 
           mkdir -p release
           APK_PATH="$(find app/build/outputs/apk -name '*.apk' | sort | tail -n 1)"
-          cp "${APK_PATH}" release/tmux-android-gitea.apk
-          ls -lh release/tmux-android-gitea.apk
-          sha256sum release/tmux-android-gitea.apk
+          cp "${APK_PATH}" release/tmux-android-gitea-compile-check.apk
+          ls -lh release/tmux-android-gitea-compile-check.apk
+          sha256sum release/tmux-android-gitea-compile-check.apk
+          echo "Gitea-built APK is a compile check only."
+          echo "Do not publish it as a release asset; release APKs are GitHub-built and mirrored byte-for-byte to Gitea."

README.md

@@ -26,6 +26,8 @@ APIs directly:
   display
 - mobile soft-key row for tmux-oriented input, including tmux prefix, detach,
   new window, previous/next window, Ctrl keys, arrows, page keys, and paste
+- terminal viewport resize based on the phone's visible text area, including
+  keyboard height changes, so tmux output wraps at the same width the user sees
 - automatic update checks with Gitea first and GitHub fallback, plus manual
   source-specific checks
 - one-download-per-version APK cache, SHA-256 verification, and installer
@@ -100,6 +102,15 @@ to reach GitHub reliably. GitHub remains an optional public source. This Gitea
 instance does not support the GitHub-style `/releases/latest/download/...` URL,
 so the app uses the Gitea Release API as the stable Gitea update entrypoint.
 
+Release APKs must be identical on GitHub and Gitea. The canonical APK is the
+GitHub Release asset built by `.github/workflows/android.yml`; publish to Gitea
+by mirroring that same `tmux-android.apk` byte-for-byte and uploading a
+Gitea-specific `latest.json` whose `apkUrl` points at the Gitea asset but whose
+`versionCode`, `versionName`, and `sha256` match the GitHub manifest. Do not use
+a separately built Gitea APK as a release asset unless it is proven to have the
+same SHA-256 as the GitHub APK. This keeps Android signatures and update
+compatibility identical no matter which platform the phone can reach.
+
 Plain branch builds only create Actions artifacts; they are useful for CI
 verification, but releases are the stable download/update channel.
 

app/src/main/java/com/neatstudio/tmuxandroid/MainActivity.java

@@ -19,13 +19,9 @@ import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
 import android.provider.Settings;
-import android.text.SpannableStringBuilder;
-import android.text.Spanned;
 import android.text.InputType;
-import android.text.style.BackgroundColorSpan;
-import android.text.style.ForegroundColorSpan;
-import android.text.style.StyleSpan;
 import android.view.Gravity;
+import android.view.HapticFeedbackConstants;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.WindowInsets;
@@ -55,9 +51,16 @@ import java.util.concurrent.Executors;
 public final class MainActivity extends Activity {
     private static final int IMAGE_PICK_REQUEST = 2001;
     private static final long AUTO_UPDATE_INTERVAL_MS = 6L * 60L * 60L * 1000L;
-    private static final int TERMINAL_COLS = 96;
-    private static final int TERMINAL_ROWS = 32;
-    private static final int MAX_TERMINAL_CHARS = 40_000;
+    private static final int DEFAULT_TERMINAL_COLS = 80;
+    private static final int DEFAULT_TERMINAL_ROWS = 24;
+    private static final int MIN_TERMINAL_COLS = 36;
+    private static final int MAX_TERMINAL_COLS = 140;
+    private static final int MIN_TERMINAL_ROWS = 8;
+    private static final int MAX_TERMINAL_ROWS = 80;
+    private static final int STATUS_NORMAL = 0;
+    private static final int STATUS_BUSY = 1;
+    private static final int STATUS_SUCCESS = 2;
+    private static final int STATUS_ERROR = 3;
     private static final long TERMINAL_RENDER_INTERVAL_MS = 80L;
     private static final String OLD_LOCAL_DEFAULT_URL = "http://127.0.0.1:3000";
     private static final String OLD_GITHUB_DEFAULT_UPDATE_URL = "https://github.com/neatstudio/tmux-browser-android/releases/latest/download/latest.json";
@@ -93,11 +96,13 @@ public final class MainActivity extends Activity {
     private String activeSessionName;
     private String activeMainPage = PAGE_SESSIONS;
     private String pendingImageUploadSession;
-    private final StringBuilder terminalBuffer = new StringBuilder();
+    private TerminalScreenBuffer terminalScreen = new TerminalScreenBuffer(DEFAULT_TERMINAL_COLS, DEFAULT_TERMINAL_ROWS);
     private final StringBuilder queuedTerminalInput = new StringBuilder();
     private boolean terminalConnected;
     private boolean terminalRenderPending;
     private long lastTerminalRenderMs;
+    private int terminalCols = DEFAULT_TERMINAL_COLS;
+    private int terminalRows = DEFAULT_TERMINAL_ROWS;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -156,7 +161,6 @@ public final class MainActivity extends Activity {
         statusText.setTextSize(12);
         statusText.setGravity(Gravity.CENTER_VERTICAL);
         statusText.setPadding(dp(10), 0, dp(10), 0);
-        statusText.setBackground(rounded(Color.rgb(22, 27, 34), 0, Color.TRANSPARENT, 0));
         statusText.setSingleLine(true);
         setStatus("Ready");
         applySystemBarInsets(root);
@@ -961,11 +965,13 @@ public final class MainActivity extends Activity {
 
     private void openTerminal(String sessionName) {
         activeSessionName = sessionName;
-        terminalBuffer.setLength(0);
+        terminalScreen = new TerminalScreenBuffer(DEFAULT_TERMINAL_COLS, DEFAULT_TERMINAL_ROWS);
         queuedTerminalInput.setLength(0);
         terminalConnected = false;
         terminalRenderPending = false;
         lastTerminalRenderMs = 0L;
+        terminalCols = DEFAULT_TERMINAL_COLS;
+        terminalRows = DEFAULT_TERMINAL_ROWS;
         root.removeAllViews();
         root.addView(createTerminalTopBar(sessionName), matchWrap());
 
@@ -986,6 +992,8 @@ public final class MainActivity extends Activity {
                 ViewGroup.LayoutParams.MATCH_PARENT,
                 ViewGroup.LayoutParams.WRAP_CONTENT
         ));
+        terminalScroll.addOnLayoutChangeListener((view, left, top, right, bottom, oldLeft, oldTop, oldRight, oldBottom) ->
+                resizeTerminalToViewport(false));
         root.addView(terminalScroll, new LinearLayout.LayoutParams(
                 ViewGroup.LayoutParams.MATCH_PARENT,
                 0,
@@ -1000,7 +1008,10 @@ public final class MainActivity extends Activity {
                 ViewGroup.LayoutParams.MATCH_PARENT,
                 dp(28)
         ));
-        connectTerminal(sessionName);
+        terminalScroll.post(() -> {
+            resizeTerminalToViewport(false);
+            connectTerminal(sessionName);
+        });
     }
 
     private LinearLayout createTerminalTopBar(String sessionName) {
@@ -1115,7 +1126,7 @@ public final class MainActivity extends Activity {
                 .setItems(items, (dialog, which) -> {
                     switch (which) {
                         case 0:
-                            terminalBuffer.setLength(0);
+                            terminalScreen.clear();
                             terminalText.setText("");
                             if (terminalSocket != null) {
                                 terminalSocket.clearHistory();
@@ -1129,12 +1140,12 @@ public final class MainActivity extends Activity {
                             break;
                         case 3:
                             if (terminalSocket != null) {
-                                terminalSocket.scroll(-TERMINAL_ROWS);
+                                terminalSocket.scroll(-terminalRows);
                             }
                             break;
                         case 4:
                             if (terminalSocket != null) {
-                                terminalSocket.scroll(TERMINAL_ROWS);
+                                terminalSocket.scroll(terminalRows);
                             }
                             break;
                         case 5:
@@ -1756,6 +1767,7 @@ public final class MainActivity extends Activity {
         queuedTerminalInput.setLength(0);
         terminalConnected = false;
         setStatus("Connecting " + sessionName);
+        resizeTerminalToViewport(false);
         appendTerminal("[connecting]\r\n");
         terminalSocket = new TerminalSocketClient(new TerminalSocketClient.Listener() {
             @Override
@@ -1763,6 +1775,7 @@ public final class MainActivity extends Activity {
                 runOnUiThread(() -> {
                     terminalConnected = true;
                     setStatus("Connected " + sessionName);
+                    resizeTerminalToViewport(true);
                     flushQueuedTerminalInput();
                 });
             }
@@ -1788,7 +1801,41 @@ public final class MainActivity extends Activity {
                 });
             }
         });
-        terminalSocket.connect(api.getBaseUrl(), sessionName, TERMINAL_COLS, TERMINAL_ROWS);
+        terminalSocket.connect(api.getBaseUrl(), sessionName, terminalCols, terminalRows);
+    }
+
+    private void resizeTerminalToViewport(boolean forceSend) {
+        if (terminalText == null || terminalScroll == null) {
+            return;
+        }
+        int width = terminalScroll.getWidth();
+        int height = terminalScroll.getHeight();
+        if (width <= 0 || height <= 0) {
+            return;
+        }
+        int horizontalPadding = terminalText.getPaddingLeft() + terminalText.getPaddingRight();
+        int verticalPadding = terminalText.getPaddingTop() + terminalText.getPaddingBottom();
+        float charWidth = terminalText.getPaint().measureText("W");
+        if (charWidth <= 0f) {
+            charWidth = dp(8);
+        }
+        int lineHeight = terminalText.getLineHeight();
+        if (lineHeight <= 0) {
+            lineHeight = dp(16);
+        }
+        int cols = clamp((int) Math.floor((width - horizontalPadding) / charWidth) - 1, MIN_TERMINAL_COLS, MAX_TERMINAL_COLS);
+        int rows = clamp((height - verticalPadding) / lineHeight, MIN_TERMINAL_ROWS, MAX_TERMINAL_ROWS);
+        if (cols == terminalCols && rows == terminalRows && !forceSend) {
+            return;
+        }
+        terminalCols = cols;
+        terminalRows = rows;
+        terminalScreen.resize(cols, rows);
+        scheduleTerminalRender();
+        TerminalSocketClient socket = terminalSocket;
+        if (socket != null && !socket.isClosed() && terminalConnected) {
+            socket.resize(cols, rows);
+        }
     }
 
     private void sendLine() {
@@ -1811,6 +1858,7 @@ public final class MainActivity extends Activity {
         TerminalSocketClient socket = terminalSocket;
         if (socket != null && !socket.isClosed() && terminalConnected) {
             socket.sendInput(data);
+            setStatus("Sent input");
             return;
         }
         if (socket != null && !socket.isClosed()) {
@@ -1823,6 +1871,7 @@ public final class MainActivity extends Activity {
                 for (int i = 0; i < data.length(); i += 200) {
                     api.sendInput(activeSessionName, data.substring(i, Math.min(i + 200, data.length())));
                 }
+                runOnUiThread(() -> setStatus("Sent input"));
             } catch (Exception error) {
                 runOnUiThread(() -> showMessage("Input failed: " + error.getMessage()));
             }
@@ -1841,23 +1890,24 @@ public final class MainActivity extends Activity {
     private void pasteClipboard() {
         ClipboardManager clipboard = (ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE);
         if (clipboard == null || !clipboard.hasPrimaryClip()) {
+            showMessage("Clipboard is empty");
             return;
         }
         ClipData clip = clipboard.getPrimaryClip();
         if (clip == null || clip.getItemCount() == 0) {
+            showMessage("Clipboard is empty");
             return;
         }
         CharSequence text = clip.getItemAt(0).coerceToText(this);
         if (text != null && text.length() > 0) {
             sendTerminalInput(text.toString());
+        } else {
+            showMessage("Clipboard is empty");
         }
     }
 
     private void appendTerminal(String data) {
-        terminalBuffer.append(data);
-        if (terminalBuffer.length() > MAX_TERMINAL_CHARS) {
-            terminalBuffer.delete(0, terminalBuffer.length() - MAX_TERMINAL_CHARS);
-        }
+        terminalScreen.write(data);
         scheduleTerminalRender();
     }
 
@@ -1879,134 +1929,10 @@ public final class MainActivity extends Activity {
             return;
         }
         lastTerminalRenderMs = System.currentTimeMillis();
-        terminalText.setText(renderAnsiForTerminal(terminalBuffer.toString()));
+        terminalText.setText(terminalScreen.render());
         terminalScroll.post(() -> terminalScroll.fullScroll(View.FOCUS_DOWN));
     }
 
-    private CharSequence renderAnsiForTerminal(String text) {
-        SpannableStringBuilder output = new SpannableStringBuilder();
-        int fg = Color.rgb(230, 235, 242);
-        int bg = Color.TRANSPARENT;
-        boolean bold = false;
-        int index = 0;
-        while (index < text.length()) {
-            char item = text.charAt(index);
-            if (item == '\r') {
-                index++;
-                continue;
-            }
-            if (item == '\u001b' && index + 1 < text.length() && text.charAt(index + 1) == '[') {
-                int end = findAnsiEnd(text, index + 2);
-                if (end == -1) {
-                    break;
-                }
-                char command = text.charAt(end);
-                if (command == 'm') {
-                    int[] state = applySgr(text.substring(index + 2, end), fg, bg, bold);
-                    fg = state[0];
-                    bg = state[1];
-                    bold = state[2] == 1;
-                }
-                index = end + 1;
-                continue;
-            }
-
-            int runStart = index;
-            while (index < text.length()) {
-                char runItem = text.charAt(index);
-                if (runItem == '\r' || (runItem == '\u001b' && index + 1 < text.length() && text.charAt(index + 1) == '[')) {
-                    break;
-                }
-                index++;
-            }
-            appendTerminalRun(output, text.substring(runStart, index), fg, bg, bold);
-        }
-        return output;
-    }
-
-    private void appendTerminalRun(SpannableStringBuilder output, String text, int fg, int bg, boolean bold) {
-        if (text.isEmpty()) {
-            return;
-        }
-        int start = output.length();
-        output.append(text);
-        int finish = output.length();
-        output.setSpan(new ForegroundColorSpan(fg), start, finish, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
-        if (bg != Color.TRANSPARENT) {
-            output.setSpan(new BackgroundColorSpan(bg), start, finish, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
-        }
-        if (bold) {
-            output.setSpan(new StyleSpan(Typeface.BOLD), start, finish, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
-        }
-    }
-
-    private int findAnsiEnd(String text, int start) {
-        for (int index = start; index < text.length(); index++) {
-            char item = text.charAt(index);
-            if (item >= '@' && item <= '~') {
-                return index;
-            }
-        }
-        return -1;
-    }
-
-    private int[] applySgr(String params, int fg, int bg, boolean bold) {
-        if (params.isEmpty()) {
-            params = "0";
-        }
-        String[] parts = params.split(";");
-        for (String part : parts) {
-            int value;
-            try {
-                value = part.isEmpty() ? 0 : Integer.parseInt(part);
-            } catch (NumberFormatException ignored) {
-                continue;
-            }
-            if (value == 0) {
-                fg = Color.rgb(230, 235, 242);
-                bg = Color.TRANSPARENT;
-                bold = false;
-            } else if (value == 1) {
-                bold = true;
-            } else if (value == 22) {
-                bold = false;
-            } else if (value == 39) {
-                fg = Color.rgb(230, 235, 242);
-            } else if (value == 49) {
-                bg = Color.TRANSPARENT;
-            } else if ((value >= 30 && value <= 37) || (value >= 90 && value <= 97)) {
-                fg = ansiColor(value, false);
-            } else if ((value >= 40 && value <= 47) || (value >= 100 && value <= 107)) {
-                bg = ansiColor(value, true);
-            }
-        }
-        return new int[]{fg, bg, bold ? 1 : 0};
-    }
-
-    private int ansiColor(int code, boolean background) {
-        int base = background ? (code >= 100 ? code - 100 : code - 40) : (code >= 90 ? code - 90 : code - 30);
-        boolean bright = code >= 90;
-        switch (base) {
-            case 0:
-                return bright ? Color.rgb(80, 88, 100) : Color.rgb(33, 38, 45);
-            case 1:
-                return bright ? Color.rgb(255, 123, 114) : Color.rgb(248, 81, 73);
-            case 2:
-                return bright ? Color.rgb(86, 211, 100) : Color.rgb(63, 185, 80);
-            case 3:
-                return bright ? Color.rgb(234, 179, 8) : Color.rgb(210, 153, 34);
-            case 4:
-                return bright ? Color.rgb(121, 192, 255) : Color.rgb(88, 166, 255);
-            case 5:
-                return bright ? Color.rgb(210, 168, 255) : Color.rgb(188, 140, 255);
-            case 6:
-                return bright ? Color.rgb(86, 211, 219) : Color.rgb(57, 197, 187);
-            case 7:
-            default:
-                return bright ? Color.rgb(240, 246, 252) : Color.rgb(201, 209, 217);
-        }
-    }
-
     private void saveServerAndRefresh() {
         String url = normalizeServerUrl(urlField.getText().toString());
         prefs.edit().putString("server_url", url).apply();
@@ -2081,7 +2007,20 @@ public final class MainActivity extends Activity {
         button.setPadding(dp(10), 0, dp(10), 0);
         button.setBackground(buttonBackground());
         button.setGravity(Gravity.CENTER);
-        button.setOnClickListener(listener);
+        button.setHapticFeedbackEnabled(true);
+        button.setOnClickListener(view -> {
+            view.performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);
+            view.animate().cancel();
+            view.setScaleX(0.96f);
+            view.setScaleY(0.96f);
+            view.animate()
+                    .scaleX(1f)
+                    .scaleY(1f)
+                    .setDuration(120L)
+                    .start();
+            setStatus(label);
+            listener.onClick(view);
+        });
         LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                 ViewGroup.LayoutParams.WRAP_CONTENT,
                 dp(42)
@@ -2102,6 +2041,7 @@ public final class MainActivity extends Activity {
 
     private StateListDrawable buttonBackground() {
         StateListDrawable states = new StateListDrawable();
+        states.addState(new int[]{-android.R.attr.state_enabled}, rounded(Color.rgb(24, 30, 37), 8, Color.rgb(35, 42, 50), 1));
         states.addState(new int[]{android.R.attr.state_pressed}, rounded(Color.rgb(64, 78, 94), 8, Color.rgb(91, 108, 128), 1));
         states.addState(new int[]{android.R.attr.state_focused}, rounded(Color.rgb(48, 61, 76), 8, Color.rgb(98, 128, 164), 1));
         states.addState(new int[]{}, rounded(Color.rgb(34, 43, 53), 8, Color.rgb(55, 66, 80), 1));
@@ -2156,16 +2096,91 @@ public final class MainActivity extends Activity {
     }
 
     private void showMessage(String message) {
+        if (message == null || message.trim().isEmpty()) {
+            return;
+        }
         Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
         setStatus(message);
     }
 
     private void setStatus(String message) {
+        setStatus(message, inferStatusTone(message));
+    }
+
+    private void setStatus(String message, int tone) {
         if (statusText != null) {
-            statusText.setText(message);
+            String value = message == null || message.trim().isEmpty() ? "Ready" : message.trim();
+            statusText.setText(value);
+            int bg = Color.rgb(22, 27, 34);
+            int stroke = Color.TRANSPARENT;
+            int text = Color.rgb(210, 215, 224);
+            if (tone == STATUS_BUSY) {
+                bg = Color.rgb(20, 44, 68);
+                stroke = Color.rgb(44, 96, 142);
+                text = Color.rgb(220, 238, 255);
+            } else if (tone == STATUS_SUCCESS) {
+                bg = Color.rgb(20, 56, 40);
+                stroke = Color.rgb(42, 118, 78);
+                text = Color.rgb(218, 245, 228);
+            } else if (tone == STATUS_ERROR) {
+                bg = Color.rgb(72, 28, 31);
+                stroke = Color.rgb(154, 66, 72);
+                text = Color.rgb(255, 226, 226);
+            }
+            statusText.setTextColor(text);
+            statusText.setBackground(rounded(bg, 0, stroke, tone == STATUS_NORMAL ? 0 : 1));
         }
     }
 
+    private int inferStatusTone(String message) {
+        if (message == null) {
+            return STATUS_NORMAL;
+        }
+        String value = message.toLowerCase(java.util.Locale.ROOT);
+        if (value.contains("failed")
+                || value.contains("error")
+                || value.contains("invalid")
+                || value.contains("cannot")
+                || value.contains("mismatch")
+                || value.contains("disconnected")
+                || value.contains("empty")
+                || value.contains("no package")
+                || value.contains("no app")) {
+            return STATUS_ERROR;
+        }
+        if (value.contains("loading")
+                || value.contains("checking")
+                || value.contains("connecting")
+                || value.contains("probing")
+                || value.contains("downloading")
+                || value.contains("preparing")
+                || value.contains("verifying")
+                || value.contains("retrying")
+                || value.contains("queued")
+                || value.contains("resolving")) {
+            return STATUS_BUSY;
+        }
+        if (value.contains("done")
+                || value.contains("loaded")
+                || value.contains("connected")
+                || value.contains("created")
+                || value.contains("killed")
+                || value.contains("opened")
+                || value.contains("sent")
+                || value.contains("selected")
+                || value.contains("saved")
+                || value.contains("using downloaded")
+                || value.contains("update found")
+                || value.contains("already up to date")) {
+            return STATUS_SUCCESS;
+        }
+        return STATUS_NORMAL;
+    }
+
+    private int clamp(int value, int min, int max) {
+        return Math.max(min, Math.min(max, value));
+    }
+
     private int dp(int value) {
         return Math.round(value * getResources().getDisplayMetrics().density);
     }

app/src/main/java/com/neatstudio/tmuxandroid/TerminalScreenBuffer.java

@@ -0,0 +1,615 @@
+package com.neatstudio.tmuxandroid;
+
+import android.graphics.Color;
+import android.graphics.Typeface;
+import android.text.SpannableStringBuilder;
+import android.text.Spanned;
+import android.text.style.BackgroundColorSpan;
+import android.text.style.ForegroundColorSpan;
+import android.text.style.StyleSpan;
+
+import java.util.ArrayList;
+import java.util.List;
+
+final class TerminalScreenBuffer {
+    private static final int DEFAULT_FG = 0xffe6ebf2;
+    private static final int DEFAULT_BG = Color.TRANSPARENT;
+
+    private int cols;
+    private int rows;
+    private Cell[][] cells;
+    private int cursorRow;
+    private int cursorCol;
+    private int savedRow;
+    private int savedCol;
+    private String pendingControl = "";
+    private boolean wrapPending;
+    private int fg = DEFAULT_FG;
+    private int bg = DEFAULT_BG;
+    private boolean bold;
+
+    TerminalScreenBuffer(int cols, int rows) {
+        resize(cols, rows);
+    }
+
+    void resize(int nextCols, int nextRows) {
+        nextCols = Math.max(1, nextCols);
+        nextRows = Math.max(1, nextRows);
+        Cell[][] previous = cells;
+        int previousRows = rows;
+        int previousCols = cols;
+        cols = nextCols;
+        rows = nextRows;
+        cells = new Cell[rows][cols];
+        for (int row = 0; row < rows; row++) {
+            for (int col = 0; col < cols; col++) {
+                cells[row][col] = new Cell();
+            }
+        }
+        if (previous != null) {
+            int copyRows = Math.min(previousRows, rows);
+            int copyCols = Math.min(previousCols, cols);
+            int previousStart = Math.max(0, previousRows - copyRows);
+            int nextStart = Math.max(0, rows - copyRows);
+            for (int row = 0; row < copyRows; row++) {
+                for (int col = 0; col < copyCols; col++) {
+                    cells[nextStart + row][col].copyFrom(previous[previousStart + row][col]);
+                }
+            }
+        }
+        cursorRow = clamp(cursorRow, 0, rows - 1);
+        cursorCol = clamp(cursorCol, 0, cols - 1);
+        savedRow = clamp(savedRow, 0, rows - 1);
+        savedCol = clamp(savedCol, 0, cols - 1);
+    }
+
+    void clear() {
+        clearScreen();
+        cursorRow = 0;
+        cursorCol = 0;
+        savedRow = 0;
+        savedCol = 0;
+        pendingControl = "";
+        wrapPending = false;
+        fg = DEFAULT_FG;
+        bg = DEFAULT_BG;
+        bold = false;
+    }
+
+    void write(String text) {
+        if (!pendingControl.isEmpty()) {
+            text = pendingControl + text;
+            pendingControl = "";
+        }
+        int index = 0;
+        while (index < text.length()) {
+            char item = text.charAt(index);
+            if (item == '\u001b') {
+                int next = handleEscape(text, index);
+                if (next < 0) {
+                    pendingControl = text.substring(index);
+                    return;
+                }
+                index = next;
+            } else if (item == '\r') {
+                wrapPending = false;
+                cursorCol = 0;
+                index++;
+            } else if (item == '\n') {
+                wrapPending = false;
+                newLine();
+                index++;
+            } else if (item == '\b') {
+                wrapPending = false;
+                cursorCol = Math.max(0, cursorCol - 1);
+                index++;
+            } else if (item == '\t') {
+                int nextTab = ((cursorCol / 8) + 1) * 8;
+                while (cursorCol < Math.min(nextTab, cols)) {
+                    putChar(' ');
+                }
+                index++;
+            } else if (item >= 0x20 && item != 0x7f) {
+                putChar(item);
+                index++;
+            } else {
+                index++;
+            }
+        }
+    }
+
+    CharSequence render() {
+        SpannableStringBuilder output = new SpannableStringBuilder();
+        for (int row = 0; row < rows; row++) {
+            appendRow(output, row);
+            if (row + 1 < rows) {
+                output.append('\n');
+            }
+        }
+        return output;
+    }
+
+    private int handleEscape(String text, int index) {
+        if (index + 1 >= text.length()) {
+            return -1;
+        }
+        char next = text.charAt(index + 1);
+        wrapPending = false;
+        if (next == '[') {
+            int end = findAnsiEnd(text, index + 2);
+            if (end == -1) {
+                return -1;
+            }
+            applyCsi(text.substring(index + 2, end), text.charAt(end));
+            return end + 1;
+        }
+        if (next == ']') {
+            return skipStringEscape(text, index + 2);
+        }
+        if (next == 'P' || next == '^' || next == '_') {
+            return skipStringEscape(text, index + 2);
+        }
+        if (next == '(' || next == ')' || next == '*' || next == '+' || next == '-' || next == '.') {
+            if (index + 2 >= text.length()) {
+                return -1;
+            }
+            return Math.min(index + 3, text.length());
+        }
+        if (next == '7') {
+            saveCursor();
+        } else if (next == '8') {
+            restoreCursor();
+        } else if (next == 'D') {
+            newLine();
+        } else if (next == 'E') {
+            cursorCol = 0;
+            newLine();
+        } else if (next == 'M') {
+            reverseIndex();
+        } else if (next == 'c') {
+            clear();
+        }
+        return Math.min(index + 2, text.length());
+    }
+
+    private void applyCsi(String rawParams, char command) {
+        wrapPending = false;
+        String params = rawParams;
+        while (!params.isEmpty()) {
+            char first = params.charAt(0);
+            if (first == '?' || first == '>' || first == '!' || first == '=') {
+                params = params.substring(1);
+            } else {
+                break;
+            }
+        }
+        List<Integer> values = parseParams(params);
+        switch (command) {
+            case 'm':
+                applySgr(values);
+                break;
+            case 'H':
+            case 'f':
+                cursorRow = clamp(param(values, 0, 1) - 1, 0, rows - 1);
+                cursorCol = clamp(param(values, 1, 1) - 1, 0, cols - 1);
+                break;
+            case 'A':
+                cursorRow = clamp(cursorRow - param(values, 0, 1), 0, rows - 1);
+                break;
+            case 'B':
+                cursorRow = clamp(cursorRow + param(values, 0, 1), 0, rows - 1);
+                break;
+            case 'C':
+                cursorCol = clamp(cursorCol + param(values, 0, 1), 0, cols - 1);
+                break;
+            case 'D':
+                cursorCol = clamp(cursorCol - param(values, 0, 1), 0, cols - 1);
+                break;
+            case 'G':
+                cursorCol = clamp(param(values, 0, 1) - 1, 0, cols - 1);
+                break;
+            case 'd':
+                cursorRow = clamp(param(values, 0, 1) - 1, 0, rows - 1);
+                break;
+            case 'J':
+                eraseDisplay(param(values, 0, 0));
+                break;
+            case 'K':
+                eraseLine(param(values, 0, 0));
+                break;
+            case 'P':
+                deleteChars(param(values, 0, 1));
+                break;
+            case '@':
+                insertChars(param(values, 0, 1));
+                break;
+            case 'X':
+                eraseChars(param(values, 0, 1));
+                break;
+            case 'L':
+                insertLines(param(values, 0, 1));
+                break;
+            case 'M':
+                deleteLines(param(values, 0, 1));
+                break;
+            case 's':
+                saveCursor();
+                break;
+            case 'u':
+                restoreCursor();
+                break;
+            case 'c':
+                break;
+            default:
+                break;
+        }
+    }
+
+    private void applySgr(List<Integer> values) {
+        if (values.isEmpty()) {
+            values.add(0);
+        }
+        for (int index = 0; index < values.size(); index++) {
+            int value = values.get(index);
+            if (value == 0) {
+                fg = DEFAULT_FG;
+                bg = DEFAULT_BG;
+                bold = false;
+            } else if (value == 1) {
+                bold = true;
+            } else if (value == 22) {
+                bold = false;
+            } else if (value == 39) {
+                fg = DEFAULT_FG;
+            } else if (value == 49) {
+                bg = DEFAULT_BG;
+            } else if ((value >= 30 && value <= 37) || (value >= 90 && value <= 97)) {
+                fg = ansiColor(value, false);
+            } else if ((value >= 40 && value <= 47) || (value >= 100 && value <= 107)) {
+                bg = ansiColor(value, true);
+            } else if ((value == 38 || value == 48) && index + 2 < values.size()) {
+                boolean background = value == 48;
+                int mode = values.get(index + 1);
+                if (mode == 5) {
+                    int color = xtermColor(values.get(index + 2));
+                    if (background) {
+                        bg = color;
+                    } else {
+                        fg = color;
+                    }
+                    index += 2;
+                } else if (mode == 2 && index + 4 < values.size()) {
+                    int color = Color.rgb(
+                            clamp(values.get(index + 2), 0, 255),
+                            clamp(values.get(index + 3), 0, 255),
+                            clamp(values.get(index + 4), 0, 255)
+                    );
+                    if (background) {
+                        bg = color;
+                    } else {
+                        fg = color;
+                    }
+                    index += 4;
+                }
+            }
+        }
+    }
+
+    private void putChar(char value) {
+        if (wrapPending) {
+            wrapPending = false;
+            newLine();
+        }
+        cells[cursorRow][cursorCol].set(value, fg, bg, bold);
+        if (cursorCol == cols - 1) {
+            wrapPending = true;
+        } else {
+            cursorCol++;
+        }
+    }
+
+    private void newLine() {
+        wrapPending = false;
+        cursorRow++;
+        if (cursorRow >= rows) {
+            scrollUp(1);
+            cursorRow = rows - 1;
+        }
+        cursorCol = 0;
+    }
+
+    private void reverseIndex() {
+        if (cursorRow == 0) {
+            scrollDown(1);
+        } else {
+            cursorRow--;
+        }
+    }
+
+    private void eraseDisplay(int mode) {
+        if (mode == 2 || mode == 3) {
+            clearScreen();
+        } else if (mode == 1) {
+            for (int row = 0; row < cursorRow; row++) {
+                clearLine(row, 0, cols - 1);
+            }
+            clearLine(cursorRow, 0, cursorCol);
+        } else {
+            clearLine(cursorRow, cursorCol, cols - 1);
+            for (int row = cursorRow + 1; row < rows; row++) {
+                clearLine(row, 0, cols - 1);
+            }
+        }
+    }
+
+    private void eraseLine(int mode) {
+        if (mode == 2) {
+            clearLine(cursorRow, 0, cols - 1);
+        } else if (mode == 1) {
+            clearLine(cursorRow, 0, cursorCol);
+        } else {
+            clearLine(cursorRow, cursorCol, cols - 1);
+        }
+    }
+
+    private void eraseChars(int count) {
+        int end = Math.min(cols - 1, cursorCol + Math.max(1, count) - 1);
+        clearLine(cursorRow, cursorCol, end);
+    }
+
+    private void deleteChars(int count) {
+        count = Math.max(1, count);
+        Cell[] line = cells[cursorRow];
+        for (int col = cursorCol; col < cols; col++) {
+            int source = col + count;
+            if (source < cols) {
+                line[col].copyFrom(line[source]);
+            } else {
+                line[col].clear();
+            }
+        }
+    }
+
+    private void insertChars(int count) {
+        count = Math.max(1, count);
+        Cell[] line = cells[cursorRow];
+        for (int col = cols - 1; col >= cursorCol; col--) {
+            int source = col - count;
+            if (source >= cursorCol) {
+                line[col].copyFrom(line[source]);
+            } else {
+                line[col].clear();
+            }
+        }
+    }
+
+    private void insertLines(int count) {
+        count = Math.min(Math.max(1, count), rows - cursorRow);
+        for (int row = rows - 1; row >= cursorRow + count; row--) {
+            copyLine(row, row - count);
+        }
+        for (int row = cursorRow; row < cursorRow + count; row++) {
+            clearLine(row, 0, cols - 1);
+        }
+    }
+
+    private void deleteLines(int count) {
+        count = Math.min(Math.max(1, count), rows - cursorRow);
+        for (int row = cursorRow; row + count < rows; row++) {
+            copyLine(row, row + count);
+        }
+        for (int row = rows - count; row < rows; row++) {
+            clearLine(row, 0, cols - 1);
+        }
+    }
+
+    private void clearScreen() {
+        for (int row = 0; row < rows; row++) {
+            clearLine(row, 0, cols - 1);
+        }
+    }
+
+    private void clearLine(int row, int start, int end) {
+        start = clamp(start, 0, cols - 1);
+        end = clamp(end, 0, cols - 1);
+        for (int col = start; col <= end; col++) {
+            cells[row][col].clear();
+        }
+    }
+
+    private void scrollUp(int count) {
+        count = Math.min(Math.max(1, count), rows);
+        for (int row = 0; row + count < rows; row++) {
+            copyLine(row, row + count);
+        }
+        for (int row = rows - count; row < rows; row++) {
+            clearLine(row, 0, cols - 1);
+        }
+    }
+
+    private void scrollDown(int count) {
+        count = Math.min(Math.max(1, count), rows);
+        for (int row = rows - 1; row - count >= 0; row--) {
+            copyLine(row, row - count);
+        }
+        for (int row = 0; row < count; row++) {
+            clearLine(row, 0, cols - 1);
+        }
+    }
+
+    private void copyLine(int target, int source) {
+        for (int col = 0; col < cols; col++) {
+            cells[target][col].copyFrom(cells[source][col]);
+        }
+    }
+
+    private void appendRow(SpannableStringBuilder output, int row) {
+        int col = 0;
+        while (col < cols) {
+            Cell first = cells[row][col];
+            int start = output.length();
+            int fgColor = first.fg;
+            int bgColor = first.bg;
+            boolean isBold = first.bold;
+            while (col < cols) {
+                Cell cell = cells[row][col];
+                if (cell.fg != fgColor || cell.bg != bgColor || cell.bold != isBold) {
+                    break;
+                }
+                output.append(cell.value);
+                col++;
+            }
+            int end = output.length();
+            output.setSpan(new ForegroundColorSpan(fgColor), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+            if (bgColor != DEFAULT_BG) {
+                output.setSpan(new BackgroundColorSpan(bgColor), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+            }
+            if (isBold) {
+                output.setSpan(new StyleSpan(Typeface.BOLD), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+            }
+        }
+    }
+
+    private void saveCursor() {
+        savedRow = cursorRow;
+        savedCol = cursorCol;
+    }
+
+    private void restoreCursor() {
+        cursorRow = clamp(savedRow, 0, rows - 1);
+        cursorCol = clamp(savedCol, 0, cols - 1);
+    }
+
+    private int skipStringEscape(String text, int start) {
+        int cursor = start;
+        while (cursor < text.length()) {
+            char item = text.charAt(cursor);
+            if (item == '\u0007') {
+                return cursor + 1;
+            }
+            if (item == '\u001b' && cursor + 1 < text.length() && text.charAt(cursor + 1) == '\\') {
+                return cursor + 2;
+            }
+            cursor++;
+        }
+        return -1;
+    }
+
+    private int findAnsiEnd(String text, int start) {
+        for (int index = start; index < text.length(); index++) {
+            char item = text.charAt(index);
+            if (item >= '@' && item <= '~') {
+                return index;
+            }
+        }
+        return -1;
+    }
+
+    private List<Integer> parseParams(String params) {
+        List<Integer> values = new ArrayList<>();
+        if (params.isEmpty()) {
+            return values;
+        }
+        String[] parts = params.split(";", -1);
+        for (String part : parts) {
+            String cleaned = part.trim();
+            if (cleaned.isEmpty()) {
+                values.add(0);
+                continue;
+            }
+            try {
+                values.add(Integer.parseInt(cleaned));
+            } catch (NumberFormatException ignored) {
+                values.add(0);
+            }
+        }
+        return values;
+    }
+
+    private int param(List<Integer> values, int index, int fallback) {
+        if (index >= values.size()) {
+            return fallback;
+        }
+        int value = values.get(index);
+        return value == 0 ? fallback : value;
+    }
+
+    private int ansiColor(int code, boolean background) {
+        int base = background ? (code >= 100 ? code - 100 : code - 40) : (code >= 90 ? code - 90 : code - 30);
+        boolean bright = code >= 90;
+        switch (base) {
+            case 0:
+                return bright ? Color.rgb(80, 88, 100) : Color.rgb(33, 38, 45);
+            case 1:
+                return bright ? Color.rgb(255, 123, 114) : Color.rgb(248, 81, 73);
+            case 2:
+                return bright ? Color.rgb(86, 211, 100) : Color.rgb(63, 185, 80);
+            case 3:
+                return bright ? Color.rgb(234, 179, 8) : Color.rgb(210, 153, 34);
+            case 4:
+                return bright ? Color.rgb(121, 192, 255) : Color.rgb(88, 166, 255);
+            case 5:
+                return bright ? Color.rgb(210, 168, 255) : Color.rgb(188, 140, 255);
+            case 6:
+                return bright ? Color.rgb(86, 211, 219) : Color.rgb(57, 197, 187);
+            case 7:
+            default:
+                return bright ? Color.rgb(240, 246, 252) : Color.rgb(201, 209, 217);
+        }
+    }
+
+    private int xtermColor(int value) {
+        value = clamp(value, 0, 255);
+        if (value < 16) {
+            if (value < 8) {
+                return ansiColor(30 + value, false);
+            }
+            return ansiColor(90 + value - 8, false);
+        }
+        if (value >= 232) {
+            int shade = 8 + (value - 232) * 10;
+            return Color.rgb(shade, shade, shade);
+        }
+        int index = value - 16;
+        int red = xtermComponent(index / 36);
+        int green = xtermComponent((index / 6) % 6);
+        int blue = xtermComponent(index % 6);
+        return Color.rgb(red, green, blue);
+    }
+
+    private int xtermComponent(int value) {
+        return value == 0 ? 0 : 55 + value * 40;
+    }
+
+    private static int clamp(int value, int min, int max) {
+        return Math.max(min, Math.min(max, value));
+    }
+
+    private static final class Cell {
+        char value = ' ';
+        int fg = DEFAULT_FG;
+        int bg = DEFAULT_BG;
+        boolean bold;
+
+        void clear() {
+            value = ' ';
+            fg = DEFAULT_FG;
+            bg = DEFAULT_BG;
+            bold = false;
+        }
+
+        void set(char nextValue, int nextFg, int nextBg, boolean nextBold) {
+            value = nextValue;
+            fg = nextFg;
+            bg = nextBg;
+            bold = nextBold;
+        }
+
+        void copyFrom(Cell other) {
+            value = other.value;
+            fg = other.fg;
+            bg = other.bg;
+            bold = other.bold;
+        }
+    }
+}

docs/android-client-notes.md

@@ -87,10 +87,12 @@ Implemented now:
   preview display
 - GitHub Actions APK build
 - release manifest `latest.json`
-- selected-source update checks; Gitea and GitHub are not probed in the same
-  update check
+- Auto/Gitea/GitHub/Selected update checks, with Auto falling back from Gitea
+  to GitHub
 - one-download-per-version APK cache, SHA-256 verification, and installer
   handoff
+- terminal viewport resize derived from the Android text area, including
+  keyboard height changes, to avoid fixed-width tmux output wrapping on phones
 - permission/about surfaces for unknown-app install status, notification status,
   app settings, app version/build type, package name, selected update source, and
   HTTP/WebSocket API/protocol summary
@@ -119,6 +121,14 @@ runs are for CI artifacts and should be used to validate grouped changes. Do not
 publish a new tag for every small UI copy or layout change; publish when there
 is a useful feature or test batch for phone-side validation.
 
+Release APKs must be identical across the public GitHub and Gitea download
+channels. Treat the GitHub Release APK as the canonical build artifact, then
+mirror that same APK byte-for-byte to the matching Gitea Release. The Gitea
+`latest.json` should point to the Gitea APK URL, but it must keep the same
+`versionCode`, `versionName`, and `sha256` as the GitHub manifest. A Gitea-built
+APK is only a compile check unless its SHA-256 exactly matches the GitHub
+release APK.
+
 ## Native Roadmap
 
 To converge with the upstream mobile design, the next implementation should add