From 39bd8150e1fe70a04a4e276a47e1de7604b13ee9 Mon Sep 17 00:00:00 2001
From: Simon Diesenreiter <simon@disi.dev>
Date: Thu, 30 Oct 2025 17:19:06 +0100
Subject: [PATCH] feat: initial implementation, refs NOISSUE

---
 requirements.txt                  |  1 +
 usev_device_access_permissions.sh |  8 +++
 volume-remapper.service           |  9 ++++
 volume_remapper.py                | 82 +++++++++++++++++++++++++++++++
 4 files changed, 100 insertions(+)
 create mode 100644 requirements.txt
 create mode 100644 usev_device_access_permissions.sh
 create mode 100644 volume-remapper.service
 create mode 100755 volume_remapper.py

diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..ac050d0
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+evdev
\ No newline at end of file
diff --git a/usev_device_access_permissions.sh b/usev_device_access_permissions.sh
new file mode 100644
index 0000000..fd47773
--- /dev/null
+++ b/usev_device_access_permissions.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+
+sudo tee /etc/udev/rules.d/99-volume-key.rules > /dev/null <<'EOF'
+# Grant read permission for the Volume‑Up key device
+SUBSYSTEM=="input", ATTRS{name}=="*volume*", MODE="0660", GROUP="input"
+EOF
+# Replace *volume* with a substring that matches your device’s name (e.g. “Logitech”) if the rule above doesn’t apply.
+sudo udevadm control --reload
\ No newline at end of file
diff --git a/volume-remapper.service b/volume-remapper.service
new file mode 100644
index 0000000..310d368
--- /dev/null
+++ b/volume-remapper.service
@@ -0,0 +1,9 @@
+[Unit]
+Description=Volume‑up key remapper
+
+[Service]
+ExecStart=/path/to/volume_remapper.py
+Restart=always
+
+[Install]
+WantedBy=default.target
\ No newline at end of file
diff --git a/volume_remapper.py b/volume_remapper.py
new file mode 100755
index 0000000..41f88ee
--- /dev/null
+++ b/volume_remapper.py
@@ -0,0 +1,82 @@
+#!/usr/bin/env python3
+"""
+volume_remapper.py
+------------------
+Listen for Volume‑Up key events and emit a different key code
+(“Ctrl+Shift+M” by default) so the focused application receives it.
+
+Dependencies: python‑evdev (pip install evdev)
+"""
+
+import sys
+import os
+import argparse
+from evdev import InputDevice, categorize, ecodes, UInput, list_devices
+import time
+
+# ------------------------------------------------------------------ #
+# Helpers
+# ------------------------------------------------------------------ #
+
+def find_device(name_substr="volume"):
+    """Return the first InputDevice that contains a KEY_VOLUMEUP event."""
+    for dev_path in [d.path for d in list_devices()]:
+        dev = InputDevice(dev_path)
+        caps = dev.capabilities()
+        if ecodes.EV_KEY in caps and ecodes.KEY_VOLUMEUP in caps[ecodes.EV_KEY]:
+            if name_substr.lower() in dev.name.lower():
+                return dev
+    return None
+
+# ------------------------------------------------------------------ #
+# Core logic
+# ------------------------------------------------------------------ #
+
+def main(remap_keys, device=None):
+    """
+    :param remap_keys: tuple of ecodes.KEY_* codes to emit (e.g. (ecodes.KEY_LCTRL, ecodes.KEY_LSHIFT, ecodes.KEY_M))
+    :param device: path to /dev/input/eventX or None to auto‑detect
+    """
+    if device is None:
+        dev = find_device()
+        if dev is None:
+            print("⚠️  No device with a Volume‑Up key found.", file=sys.stderr)
+            sys.exit(1)
+    else:
+        dev = InputDevice(device)
+
+    print(f"[INFO] Listening on {dev.path} ({dev.name}) ...")
+    print(f"[INFO] Remapping to: {', '.join(ecodes.KEY.get(k) for k in remap_keys)}")
+
+    # Create a virtual keyboard (uinput)
+    ui = UInput(events=[
+        ecodes.EV_KEY,  # only key events
+        ecodes.EV_SYN
+    ], name='volume‑remapper')
+
+    try:
+        for event in dev.read_loop():
+            if event.type == ecodes.EV_KEY:
+                if event.code == ecodes.KEY_VOLUMEUP and event.value == 1:  # key_down
+                    # Emit the mapped key sequence
+                    for key in remap_keys:
+                        ui.write(ecodes.EV_KEY, key, 1)  # key down
+                        ui.write(ecodes.EV_KEY, key, 0)  # key up
+                    ui.syn()
+                    print(f"✅  Mapped Volume‑Up → {', '.join(ecodes.KEY.get(k) for k in remap_keys)}")
+    except KeyboardInterrupt:
+        print("\n[INFO] Stopping …")
+    finally:
+        ui.close()
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="Remap Volume‑Up to any key combo.")
+    parser.add_argument("--device", help="Optional /dev/input/eventX path to listen on.")
+    parser.add_argument("--to", nargs="+", default=["KEY_LCTRL", "KEY_LSHIFT", "KEY_M"],
+                        help="Space‑separated key names to emit.  Default: Ctrl+Shift+M")
+    args = parser.parse_args()
+
+    # Convert key names to ecodes
+    remap = [ecodes.KEY[code.upper()] for code in args.to]
+    main(remap_keys=remap, device=args.device)
\ No newline at end of file