From 50fe0033d6dd9db1a193d81fd937db2db452fe11 Mon Sep 17 00:00:00 2001
From: Ico Doornekamp <ico@pruts.nl>
Date: Tue, 24 Jul 2018 18:42:51 +0200
Subject: [PATCH] Added support for mapping key combos on devices with a
 hardware keyboard, Fixes #731.

  Fn+Left  -> Home
  Fn+Right -> End
  Fn+Up    -> Page Up
  Fn+Down  -> Page Down
---
 .../java/com/termux/terminal/KeyHandler.java  | 27 +++++++++++++++----
 .../java/com/termux/view/TerminalView.java    |  1 +
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/terminal-emulator/src/main/java/com/termux/terminal/KeyHandler.java b/terminal-emulator/src/main/java/com/termux/terminal/KeyHandler.java
index a4d0f1ac87..6e4b809c5f 100644
--- a/terminal-emulator/src/main/java/com/termux/terminal/KeyHandler.java
+++ b/terminal-emulator/src/main/java/com/termux/terminal/KeyHandler.java
@@ -59,6 +59,7 @@ public final class KeyHandler {
     public static final int KEYMOD_ALT = 0x80000000;
     public static final int KEYMOD_CTRL = 0x40000000;
     public static final int KEYMOD_SHIFT = 0x20000000;
+    public static final int KEYMOD_FUNCTION = 0x10000000;
 
     private static final Map<String, Integer> TERMCAP_TO_KEYCODE = new HashMap<>();
 
@@ -154,13 +155,29 @@ public static String getCode(int keyCode, int keyMode, boolean cursorApp, boolea
                 return "\015";
 
             case KEYCODE_DPAD_UP:
-                return (keyMode == 0) ? (cursorApp ? "\033OA" : "\033[A") : transformForModifiers("\033[1", keyMode, 'A');
+                if((keyMode & KEYMOD_FUNCTION) != 0) {
+                    return transformForModifiers("\033[5", keyMode, '~');
+                } else {
+                    return (keyMode == 0) ? (cursorApp ? "\033OA" : "\033[A") : transformForModifiers("\033[1", keyMode, 'A');
+                }
             case KEYCODE_DPAD_DOWN:
-                return (keyMode == 0) ? (cursorApp ? "\033OB" : "\033[B") : transformForModifiers("\033[1", keyMode, 'B');
+                if((keyMode & KEYMOD_FUNCTION) != 0) {
+                    return transformForModifiers("\033[6", keyMode, '~');
+                } else {
+                    return (keyMode == 0) ? (cursorApp ? "\033OB" : "\033[B") : transformForModifiers("\033[1", keyMode, 'B');
+                }
             case KEYCODE_DPAD_RIGHT:
-                return (keyMode == 0) ? (cursorApp ? "\033OC" : "\033[C") : transformForModifiers("\033[1", keyMode, 'C');
+                if((keyMode & KEYMOD_FUNCTION) != 0) {
+                    return ((keyMode & ~KEYMOD_FUNCTION) == 0) ? "\033[F" : transformForModifiers("\033[1", keyMode, 'F');
+                } else {
+                    return (keyMode == 0) ? (cursorApp ? "\033OC" : "\033[C") : transformForModifiers("\033[1", keyMode, 'C');
+                }
             case KEYCODE_DPAD_LEFT:
-                return (keyMode == 0) ? (cursorApp ? "\033OD" : "\033[D") : transformForModifiers("\033[1", keyMode, 'D');
+                if((keyMode & KEYMOD_FUNCTION) != 0) {
+                    return ((keyMode & ~KEYMOD_FUNCTION) == 0) ? "\033[H" : transformForModifiers("\033[1", keyMode, 'H');
+                } else {
+                    return (keyMode == 0) ? (cursorApp ? "\033OD" : "\033[D") : transformForModifiers("\033[1", keyMode, 'D');
+                }
 
             case KEYCODE_MOVE_HOME:
                 // Note that KEYCODE_HOME is handled by the system and never delivered to applications.
@@ -283,7 +300,7 @@ public static String getCode(int keyCode, int keyMode, boolean cursorApp, boolea
 
     private static String transformForModifiers(String start, int keymod, char lastChar) {
         int modifier;
-        switch (keymod) {
+        switch (keymod & (KEYMOD_SHIFT | KEYMOD_ALT | KEYMOD_CTRL)) {
             case KEYMOD_SHIFT:
                 modifier = 2;
                 break;
diff --git a/terminal-view/src/main/java/com/termux/view/TerminalView.java b/terminal-view/src/main/java/com/termux/view/TerminalView.java
index feadb25d48..bfa931df08 100644
--- a/terminal-view/src/main/java/com/termux/view/TerminalView.java
+++ b/terminal-view/src/main/java/com/termux/view/TerminalView.java
@@ -600,6 +600,7 @@ public boolean onKeyDown(int keyCode, KeyEvent event) {
         if (controlDownFromEvent) keyMod |= KeyHandler.KEYMOD_CTRL;
         if (event.isAltPressed()) keyMod |= KeyHandler.KEYMOD_ALT;
         if (event.isShiftPressed()) keyMod |= KeyHandler.KEYMOD_SHIFT;
+        if (event.isFunctionPressed()) keyMod |= KeyHandler.KEYMOD_FUNCTION;
         if (handleKeyCode(keyCode, keyMod)) {
             if (LOG_KEY_EVENTS) Log.i(EmulatorDebug.LOG_TAG, "handleKeyCode() took key event");
             return true;