1 files changed, 78 insertions, 0 deletions
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..fc3d36b
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,78 @@
+{
+  # Nixpkgs / NixOS version to use.
+  inputs.nixpkgs.url = "nixpkgs/nixos-unstable";
+
+  outputs = { self, nixpkgs }:
+    let
+
+      # to work with older version of flakes
+      lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
+
+      # Generate a user-friendly version number.
+      version = builtins.substring 0 8 lastModifiedDate;
+
+      # System types to support.
+      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
+
+      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+
+      # Nixpkgs instantiated for supported system types.
+      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; overlays = [ self.overlay ]; });
+
+    in
+
+    {
+
+      # A Nixpkgs overlay.
+      overlay = final: prev: {
+
+        emoji = with final; stdenv.mkDerivation rec {
+          name = "emoji-${version}";
+
+          unpackPhase = ":";
+
+          buildInputs = with pkgs; [ unzip ];
+
+          src = ./.;
+
+          cldrVersion = "46";
+
+          emojiList = pkgs.fetchurl {
+            url = "https://unicode.org/Public/cldr/${cldrVersion}/core.zip";
+            sha256 = "sha256-+86cInWGKtJmaPs0eD/mwznz2S3f61oQoXdftYGBoV0=";
+          };
+
+          buildPhase = ''
+            unzip ${emojiList} common/annotations/en.xml
+            grep -E 'annotation cp="[^"]+">' <common/annotations/en.xml |
+              sed -E 's/\s+<annotation cp="//g; s/">/ /g; s|</annotation>||g; s/\s\|\s/, /g' > emoji_list
+
+            cat > emoji_picker << EOF
+            #!/bin/sh
+            ${bemenu}/bin/bemenu -i -l20 <$out/share/emoji_list | ${coreutils}/bin/cut -d' ' -f1 | ${wl-clipboard}/bin/wl-copy -n
+            EOF
+            chmod +x emoji_picker
+          '';
+
+          installPhase = ''
+            mkdir -p $out/{bin,share}
+            cp emoji_picker $out/bin/
+            cp emoji_list $out/share/
+          '';
+        };
+
+      };
+
+      # Provide some binary packages for selected system types.
+      packages = forAllSystems (system:
+        {
+          inherit (nixpkgsFor.${system}) emoji;
+        });
+
+      # The default package for 'nix build'. This makes sense if the
+      # flake provides only one package or there is a clear "main"
+      # package.
+      defaultPackage = forAllSystems (system: self.packages.${system}.emoji);
+    };
+}