debug.sh

@@ -1,2 +0,0 @@
-#!/usr/bin/env bash
-lldb -- ./zig-out/bin/zremap /dev/input/by-path/platform-i8042-serio-0-event-kbd 

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1696419054,
-        "narHash": "sha256-EdR+dIKCfqL3voZUDYwcvgRDOektQB9KbhBVcE0/3Mo=",
+        "lastModified": 1693060755,
+        "narHash": "sha256-KNsbfqewEziFJEpPR0qvVz4rx0x6QXxw1CcunRhlFdk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "7131f3c223a2d799568e4b278380cd9dac2b8579",
+        "rev": "c66ccfa00c643751da2fd9290e096ceaa30493fc",
         "type": "github"
       },
       "original": {

flake.nix

@@ -11,22 +11,17 @@
         version = "0.1";
         src = self;
         nativeBuildInputs = [zig.hook];
-        buildInputs = [libevdev pkg-config];
-        buildPhase = ''
-          NIX_CFLAGS_COMPILE="-isystem $(pkg-config --variable=includedir libevdev)/libevdev-1.0 $NIX_CFLAGS_COMPILE"
-        '';
+        buildInputs = [libevdev];
       };
 
     devShells.x86_64-linux.default = with import nixpkgs {system = "x86_64-linux";};
       mkShell {
-        nativeBuildInputs = [zig lldb];
         buildInputs = [
           libevdev
-          pkg-config
+          zig
         ];
 
         shellHook = ''
-          NIX_CFLAGS_COMPILE="-isystem $(pkg-config --variable=includedir libevdev)/libevdev-1.0 $NIX_CFLAGS_COMPILE"
           echo "happy hacking!"
         '';
       };

src/main.zig

@@ -1,59 +1,42 @@
 const std = @import("std");
 const c = @cImport({
     @cInclude("linux/input.h");
-    @cInclude("libevdev/libevdev.h");
-    @cInclude("libevdev/libevdev-uinput.h");
+    @cInclude("libevdev-1.0/libevdev/libevdev.h");
     @cInclude("errno.h");
 });
 
 const CapsLockDown = c.input_event{ .type = c.EV_KEY, .code = c.KEY_CAPSLOCK, .value = 1, .time = undefined };
 const CapsLockUp = c.input_event{ .type = c.EV_KEY, .code = c.KEY_CAPSLOCK, .value = 0, .time = undefined };
+const EscDown = c.input_event{ .type = c.EV_KEY, .code = c.KEY_ESC, .value = 1, .time = undefined };
+const EscUp = c.input_event{ .type = c.EV_KEY, .code = c.KEY_ESC, .value = 0, .time = undefined };
 const LShiftDown = c.input_event{ .type = c.EV_KEY, .code = c.KEY_LEFTSHIFT, .value = 1, .time = undefined };
 const LShiftUp = c.input_event{ .type = c.EV_KEY, .code = c.KEY_LEFTSHIFT, .value = 0, .time = undefined };
 const RShiftDown = c.input_event{ .type = c.EV_KEY, .code = c.KEY_RIGHTSHIFT, .value = 1, .time = undefined };
 const RShiftUp = c.input_event{ .type = c.EV_KEY, .code = c.KEY_RIGHTSHIFT, .value = 0, .time = undefined };
+const Syn = c.input_event{ .type = c.EV_SYN, .code = c.SYN_REPORT, .value = 0, .time = undefined };
 
 fn event_equal(e1: *const c.input_event, e2: *const c.input_event) bool {
-    return (e1.type == e2.type) and (e1.code == e2.code) and (e1.value == e2.value);
+    return (e1.*.type == e2.*.type) and (e1.*.code == e2.*.code) and (e1.*.value == e2.*.value);
 }
 
-fn inputDeviceOpenAndGrab(dev_name: []const u8) !?*c.libevdev {
-    const dev_fd = try std.fs.openFileAbsolute(dev_name, .{});
-    const dev = c.libevdev_new();
-    if (c.libevdev_set_fd(dev, dev_fd.handle) < 0) {
-        return error.libevdevCreateFail;
-    }
-    if (c.libevdev_grab(dev, c.LIBEVDEV_GRAB) < 0) {
-        return error.libevdevGrabFail;
-    }
-    return dev;
+//fn event_read(event: *c.input_event) !void {
+//    event.* = try std.io.getStdIn().reader().readStruct(@TypeOf(event.*));
+//}
+
+fn event_write(event: *const c.input_event) !void {
+    try std.io.getStdOut().writer().writeStruct(event.*);
 }
 
-fn uinputCreate(dev: *c.libevdev) !?*c.libevdev_uinput {
-    var uinput: *align(8) c.libevdev_uinput = undefined;
-    if (c.libevdev_uinput_create_from_device(@ptrCast(dev), c.LIBEVDEV_UINPUT_OPEN_MANAGED, @ptrCast(&uinput)) < 0) {
-        return error.libevdevUinputCreateFail;
-    }
-    return uinput;
-}
-
-fn uinputWrite(uinput_dev: *c.libevdev_uinput, event: *const c.input_event) !void {
-    if (c.libevdev_uinput_write_event(@ptrCast(uinput_dev), event.type, event.code, event.value) < 0) {
-        return error.writeFailed;
-    }
-}
-
-fn uinputWriteKey(uinput_dev: *c.libevdev_uinput, key: u16) !void {
-    const pressKey = c.input_event{ .type = c.EV_KEY, .code = key, .value = 1, .time = undefined };
-    const releaseKey = c.input_event{ .type = c.EV_KEY, .code = key, .value = 0, .time = undefined };
-    const sync = c.input_event{ .type = c.EV_SYN, .code = c.SYN_REPORT, .value = 0, .time = undefined };
+fn write_esc() !void {
     std.time.sleep(20000);
-    try uinputWrite(uinput_dev, &pressKey);
-    try uinputWrite(uinput_dev, &sync);
+    try event_write(&EscDown);
+    try event_write(&Syn);
     std.time.sleep(20000);
-    try uinputWrite(uinput_dev, &releaseKey);
+    try event_write(&EscUp);
 }
 
+fn device_open() !void {}
+
 pub fn main() !void {
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
     const allocator = gpa.allocator();
@@ -66,8 +49,17 @@ pub fn main() !void {
         std.os.exit(1);
     }
     const dev_name = args[1];
-    const dev = try inputDeviceOpenAndGrab(dev_name);
-    const uinput_dev = try uinputCreate(dev.?);
+    var dev_fd = try std.fs.openFileAbsolute(dev_name, .{});
+
+    const dev = c.libevdev_new();
+    if (c.libevdev_set_fd(dev, dev_fd.handle) < 0) {
+        std.debug.print("evdev: failed creating device from descriptor", .{});
+        std.os.exit(1);
+    }
+    if (c.libevdev_grab(dev, c.LIBEVDEV_GRAB) < 0) {
+        std.debug.print("evdev: failed grabbing device", .{});
+        std.os.exit(1);
+    }
 
     var write_esc_lshift: bool = undefined;
     var write_esc_rshift: bool = undefined;
@@ -90,12 +82,12 @@ pub fn main() !void {
             break :outer;
         }
 
-        if (event.type == c.EV_MSC and event.code == c.MSC_SCAN) {
+        if (event.type == c.EV_MSC and event.type == c.MSC_SCAN) {
             continue :outer;
         }
 
         if (event.type != c.EV_KEY) {
-            try uinputWrite(uinput_dev.?, &event);
+            try event_write(&event);
             continue :outer;
         }
 
@@ -108,16 +100,16 @@ pub fn main() !void {
             event.code = c.KEY_LEFTMETA;
         }
 
-        try uinputWrite(uinput_dev.?, &event);
+        try event_write(&event);
 
         if (write_esc_lshift) {
             write_esc_lshift = false;
-            try uinputWriteKey(uinput_dev.?, c.KEY_ESC);
+            try write_esc();
         }
 
         if (write_esc_rshift) {
             write_esc_rshift = false;
-            try uinputWriteKey(uinput_dev.?, c.KEY_ESC);
+            try write_esc();
         }
     }
 }