From 2574b83cb0454a146a0346bf0d6a134d62241e60 Mon Sep 17 00:00:00 2001
From: "Agatha V. Lovelace" <agatha@technogothic.net>
Date: Thu, 20 Apr 2023 22:01:38 +0200
Subject: [PATCH] Add NixOS module

---
 .direnv/flake-profile           |  1 +
 .direnv/flake-profile-1-link    |  1 +
 .github/workflows/build_nix.yml |  6 ++--
 README.md                       | 16 +++++++++
 flake.nix                       | 63 +++++++++++++++++++++++++++++++--
 5 files changed, 82 insertions(+), 5 deletions(-)
 create mode 120000 .direnv/flake-profile
 create mode 120000 .direnv/flake-profile-1-link

diff --git a/.direnv/flake-profile b/.direnv/flake-profile
new file mode 120000
index 0000000..0c05709
--- /dev/null
+++ b/.direnv/flake-profile
@@ -0,0 +1 @@
+flake-profile-1-link
\ No newline at end of file
diff --git a/.direnv/flake-profile-1-link b/.direnv/flake-profile-1-link
new file mode 120000
index 0000000..71d827c
--- /dev/null
+++ b/.direnv/flake-profile-1-link
@@ -0,0 +1 @@
+/nix/store/vhxg5a3va792mff3i55jgcd2fayjzc2z-nix-shell-env
\ No newline at end of file
diff --git a/.github/workflows/build_nix.yml b/.github/workflows/build_nix.yml
index c58ea8f..88a0031 100644
--- a/.github/workflows/build_nix.yml
+++ b/.github/workflows/build_nix.yml
@@ -10,8 +10,10 @@ jobs:
       - uses: actions/checkout@v3
       - uses: cachix/install-nix-action@v12
       - name: Building package
-        run:  nix-build . -A defaultPackage.x86_64-linux
+        run:  nix-build . -A packages.x86_64-linux.default
+      - name: Get commit hash
+        run:  echo "COMMIT_HASH=${GITHUB_SHA::6}" >> $GITHUB_ENV
       - uses: actions/upload-artifact@v3
         with:
-          name: url-eater-x86_64-linux
+          name: colorpickle-${{ env.COMMIT_HASH }}-x86_64-linux
           path: result/bin/colorpickle
diff --git a/README.md b/README.md
index 7b18f42..f23db2d 100644
--- a/README.md
+++ b/README.md
@@ -33,4 +33,20 @@ Options:
       --saturate <SATURATE>      Saturate/desaturate colors [default: 0]
   -h, --help                     Print help
   -V, --version                  Print version
+```
+
+## Using the NixOS module
+
+After importing the NixOS module exposed by this flake, a colorscheme can be defined like this:
+```nix
+environment.graphical.colorschemes.purple = {
+  image = ../../../external/6.png;
+  params = [ "--lighten" "0.05" "--bold-delta" "0.1" ];
+};
+```
+The generated colors will be accessible from `environment.graphical.colors.purple` 
+as an attribute set of hex color strings:
+```
+nix-repl> nodes.ritual.config.environment.graphical.colors.purple
+{ "0" = "#19172b"; "1" = "#453354"; "10" = "#90629a"; "11" = "#7a6d98"; "12" = "#9a79ab"; "13" = "#a6a1bc"; "14" = "#b69dba"; "15" = "#d0c5dc"; "16" = ""; "2" = "#734e7b"; "3" = "#62577b"; "4" = "#825d94"; "5" = "#8a83a7"; "6" = "#a07fa5"; "7" = "#b7a5c9"; "8" = "#2c294c"; "9" = "#5f4674"; }
 ```
\ No newline at end of file
diff --git a/flake.nix b/flake.nix
index 845d2de..faf8c60 100644
--- a/flake.nix
+++ b/flake.nix
@@ -11,8 +11,8 @@
         pkgs = import nixpkgs { inherit system; };
         naersk-lib = pkgs.callPackage naersk { };
       in {
-        defaultPackage = naersk-lib.buildPackage ./.;
-        devShell = with pkgs;
+        packages.default = naersk-lib.buildPackage ./.;
+        devShells.default = with pkgs;
           mkShell {
             buildInputs = [
               cargo
@@ -24,5 +24,62 @@
             ];
             RUST_SRC_PATH = rustPlatform.rustLibSrc;
           };
-      });
+      }) // {
+        nixosModules.default = { config, lib, pkgs, ... }:
+          with lib; {
+            options.environment.graphical = with types; {
+              colorschemes = mkOption {
+                default = { };
+                type = attrsOf (submodule {
+                  options = {
+                    image = mkOption {
+                      type = either str path;
+                      description =
+                        "Path to image that will be used as input for colorscheme generation";
+                    };
+                    params = mkOption {
+                      type = listOf str;
+                      default = [ ];
+                      description =
+                        mdDoc "list of parameters to pass to `colorpickle`";
+                      example = [
+                        "--colors"
+                        "8"
+                        "--lighten"
+                        "0.05"
+                        "--bold-delta"
+                        "0.1"
+                      ];
+                    };
+                  };
+                });
+              };
+              colors = mkOption {
+                default = { };
+                type = attrsOf (attrsOf str);
+              };
+            };
+
+            config = let
+              generate = name: image: args:
+                pkgs.runCommand "colors-${name}" {
+                  nativeBuildInputs = [ self.packages.${pkgs.system}.default ];
+                } ''
+                  colorpickle ${image} ${
+                    lib.strings.concatStringsSep " " args
+                  } > $out
+                '';
+              formattedColors = name: image: args:
+                builtins.listToAttrs (lib.lists.imap0 (i: v: {
+                  name = builtins.toString i;
+                  value = v;
+                }) (lib.strings.splitString "\n"
+                  (builtins.readFile (generate name image args))));
+            in {
+              environment.graphical.colors = lib.attrsets.mapAttrs
+                (name: value: formattedColors name value.image value.params)
+                config.environment.graphical.colorschemes;
+            };
+          };
+      };
 }