From 2025ebe1d91525c69b4b7d486da3a5d2f4278617 Mon Sep 17 00:00:00 2001
From: Julian T <julian@jtle.dk>
Date: Sun, 13 Mar 2022 18:17:43 +0100
Subject: Use interception-tools for mapping keys

---
 desktop.nix      | 31 ++++++++++++++++++++++---------
 intcp-mapper.nix | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+), 9 deletions(-)
 create mode 100644 intcp-mapper.nix

diff --git a/desktop.nix b/desktop.nix
index 2f293d4..a170eaf 100644
--- a/desktop.nix
+++ b/desktop.nix
@@ -63,17 +63,30 @@
         # Enable CUPS to print documents.
         printing.enable = true;
 
-        postgresql = {
-            enable = false;
-            initialScript = pkgs.writeText "backend-initScript" ''
-                CREATE ROLE julian WITH LOGIN PASSWORD 'hejmeddig' CREATEDB;
-                CREATE DATABASE julian;
-                GRANT ALL PRIVILEGES ON DATABASE julian TO julian;
-            '';
-        };
-
         blueman.enable = true;
 
+        interception-tools =
+            let mappings = [
+                        { from = "KEY_CAPSLOCK"; to = "KEY_LEFTCTRL"; }
+                        { from = "KEY_LEFTALT"; to = "KEY_LEFTMETA"; }
+                        { from = "KEY_102ND"; to = "KEY_LEFTALT"; }
+                    ];
+                mapper = pkgs.callPackage ./intcp-mapper.nix { inherit mappings; };
+                intercept = pkgs.interception-tools;
+            in {
+                enable = true;
+                # We will just use our own here
+                plugins = [];
+
+                udevmonConfig = ''
+                    - JOB: "${intercept}/bin/intercept -g $DEVNODE | ${mapper}/bin/mapper | ${intercept}/bin/uinput -d $DEVNODE"
+                      DEVICE:
+                        EVENTS:
+                          EV_KEY: ${builtins.toJSON (map (m: m.from) mappings) }
+                '';
+            };
+
+
         udev.packages = [ pkgs.yubikey-personalization ];
     };
 
diff --git a/intcp-mapper.nix b/intcp-mapper.nix
new file mode 100644
index 0000000..5863f85
--- /dev/null
+++ b/intcp-mapper.nix
@@ -0,0 +1,46 @@
+{ lib, stdenv, writeText, mappings ? [] }:
+
+stdenv.mkDerivation rec {
+    name = "intcp-mapper";
+
+    src = writeText "intcp-mapper.c" ''
+#include <stdio.h>
+#include <stdlib.h>
+#include <linux/input.h>
+
+int main(void) {
+    setbuf(stdin, NULL), setbuf(stdout, NULL);
+
+    struct input_event event;
+    while (fread(&event, sizeof(event), 1, stdin) == 1) {
+        /* Example
+        if (event.type == EV_KEY && event.code == KEY_X) {
+            event.code = KEY_Y;
+        }
+        */
+
+        if (event.type == EV_KEY) {
+            ${ lib.concatStrings (map (m: ''
+                if (event.code == ${m.from}) {
+                    event.code = ${m.to};
+                }
+            '') mappings) }
+        }
+
+        fwrite(&event, sizeof(event), 1, stdout);
+    };
+}
+    '';
+
+    dontUnpack = true;
+
+    buildPhase = ''
+        cat $src
+        gcc $src -o mapper
+    '';
+
+    installPhase = ''
+        mkdir -p $out/bin
+        install -m 555 mapper $out/bin/mapper
+    '';
+}
-- 
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