Add license generator

LICENSE

@@ -1,3 +1,4 @@
+
                                  Apache License
                            Version 2.0, January 2004
                         http://www.apache.org/licenses/
@@ -186,7 +187,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2022 William Phetsinorath
+   Copyright 2025 Shikanime Studio
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.

flake.nix

@@ -127,15 +127,24 @@
         };
 
         perSystem =
-          { pkgs, ... }:
+          { config, pkgs, ... }:
           {
-            devenv.shells.default.imports = [
-              self.devenvModules.git
-              self.devenvModules.github
-              self.devenvModules.nix
-              self.devenvModules.shell
-              self.devenvModules.shikanime-studio
-            ];
+            devenv.shells.default = {
+              imports = [
+                self.devenvModules.git
+                self.devenvModules.github
+                self.devenvModules.nix
+                self.devenvModules.shell
+                self.devenvModules.shikanime-studio
+              ];
+              license = {
+                enable = true;
+                holder = "Shikanime Studio";
+                package = config.devenv.shells.default.license.lib.pkgs.asl20;
+                year = "2025";
+              };
+            };
+
             packages = {
               fleet = pkgs.callPackage ./pkgs/fleet { };
               bootloose = pkgs.callPackage ./pkgs/bootloose { };

modules/devenv/integrations/license.nix

@@ -0,0 +1,105 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+with lib;
+
+let
+  cfg = config.license;
+in
+{
+  options.license = {
+    enable = mkEnableOption "license generation";
+
+    package = mkOption {
+      type = types.functionTo types.package;
+      default = license.generate;
+      description = "License generator function.";
+    };
+
+    lib = lib.mkOption {
+      type = lib.types.attrsOf lib.types.anything;
+    };
+
+    holder = mkOption {
+      type = types.str;
+      description = "Copyright holder.";
+    };
+
+    year = mkOption {
+      type = types.str;
+      description = "Override year; null lets the generator use the current year.";
+    };
+
+    description = mkOption {
+      type = types.str;
+      description = "Project description to use in the license text (unused for some licenses).";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    license.lib.pkgs = {
+      agpl3Only =
+        let
+          template = builtins.fetchurl {
+            url = "https://www.gnu.org/licenses/agpl-3.0.txt";
+            sha256 = "1c5wk83xn43pma39yf6xm0mr312iinqi7xrh3xplnvddd3zs95hd";
+          };
+        in
+        {
+          year,
+          holder,
+          description,
+        }:
+        pkgs.runCommand "LICENSE" { inherit year holder description; } ''
+          ${pkgs.gnused}/bin/sed \
+            -e "s/<one line to give the program's name and a brief idea of what it does.>/$description/g" \
+            -e "s/<year>/$year/g" \
+            -e "s/<name of author>/$holder/g" \
+            ${template} > $out
+        '';
+
+      asl20 =
+        let
+          template = builtins.fetchurl {
+            url = "https://www.apache.org/licenses/LICENSE-2.0.txt";
+            sha256 = "0c1xaay1fd00xgri0z447q2i8s3mpxqw9da27hfd6fznjsdp9iyg";
+          };
+        in
+        { year, holder, ... }:
+        pkgs.runCommand "LICENSE" { inherit year holder; } ''
+          ${pkgs.gnused}/bin/sed \
+            -e "s/\[yyyy\]/$year/g" \
+            -e "s/\[name of copyright owner\]/$holder/g" \
+            ${template} > $out
+        '';
+
+      mit =
+        let
+          template = builtins.fetchurl {
+            url = "https://raw.githubusercontent.com/github/choosealicense.com/gh-pages/_licenses/mit.txt";
+            sha256 = "1f7m7v5af7pk46m7q2qi3xp51x6hjvclh44dj47k1cxc7jqrv4g6";
+          };
+        in
+        { year, holder, ... }:
+        pkgs.runCommand "LICENSE" { inherit year holder; } ''
+          ${pkgs.gnused}/bin/sed \
+            -e '/^---$/,/^---$/d' \
+            -e "s/\[year\]/$year/g" \
+            -e "s/\[fullname\]/$holder/g" \
+            ${template} > $out
+        '';
+    };
+
+    tasks."devlib:license:install" = {
+      before = [ "devenv:enterShell" ];
+      description = "Install LICENSE file";
+      exec = ''
+        ${pkgs.coreutils}/bin/cat ${cfg.package { inherit (cfg) year holder description; }} > LICENSE
+      '';
+    };
+  };
+}