From f6381b14b0b53c2f29f97f047e6a2d59313bf1f0 Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Thu, 4 Nov 2021 15:55:33 +0100
Subject: [PATCH] pkgs: add change-backlight

---
 pkgs/change-backlight/change-backlight | 15 +++++++++
 pkgs/change-backlight/default.nix      | 44 ++++++++++++++++++++++++++
 pkgs/default.nix                       |  2 ++
 3 files changed, 61 insertions(+)
 create mode 100755 pkgs/change-backlight/change-backlight
 create mode 100644 pkgs/change-backlight/default.nix

diff --git a/pkgs/change-backlight/change-backlight b/pkgs/change-backlight/change-backlight
new file mode 100755
index 0000000..e178151
--- /dev/null
+++ b/pkgs/change-backlight/change-backlight
@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+if [ "$1" = "up" ]; then
+    upDown="+$2%"
+else
+    upDown="$2%-"
+fi
+
+newBrightness="$(brightnessctl -m set "$upDown" | cut -d, -f4)"
+notify-send -u low \
+    -h string:x-canonical-private-synchronous:change-backlight \
+    -h "int:value:${newBrightness/\%/}" \
+    -- "Set brightness to $newBrightness"
diff --git a/pkgs/change-backlight/default.nix b/pkgs/change-backlight/default.nix
new file mode 100644
index 0000000..799c814
--- /dev/null
+++ b/pkgs/change-backlight/default.nix
@@ -0,0 +1,44 @@
+{ lib, brightnessctl, libnotify, makeWrapper, shellcheck, stdenvNoCC }:
+stdenvNoCC.mkDerivation rec {
+  pname = "change-backlight";
+  version = "0.1.0";
+
+  src = ./change-backlight;
+
+  buildInputs = [
+    makeWrapper
+    shellcheck
+  ];
+
+  dontUnpack = true;
+
+  buildPhase = ''
+    shellcheck $src
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp $src $out/bin/change-backlight
+    chmod a+x $out/bin/change-backlight
+  '';
+
+  wrapperPath = lib.makeBinPath [
+    brightnessctl
+    libnotify
+  ];
+
+  fixupPhase = ''
+    patchShebangs $out/bin/change-backlight
+    wrapProgram $out/bin/change-backlight --prefix PATH : "${wrapperPath}"
+  '';
+
+  meta = with lib; {
+    description = ''
+      A script to change a screen's brightness and notify about it
+    '';
+    homepage = "https://gitea.belanyi.fr/ambroisie/nix-config";
+    license = with licenses; [ mit ];
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ ambroisie ];
+  };
+}
diff --git a/pkgs/default.nix b/pkgs/default.nix
index 46fa4ab..3f7b1df 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -2,6 +2,8 @@
 pkgs.lib.makeScope pkgs.newScope (pkgs: {
   bw-pass = pkgs.callPackage ./bw-pass { };
 
+  change-backlight = pkgs.callPackage ./change-backlight { };
+
   comma = pkgs.callPackage ./comma { };
 
   diff-flake = pkgs.callPackage ./diff-flake { };