lib: liberate from the module system (fixes #52)

flake.nix

@@ -21,7 +21,19 @@
     forAllSystems = nixpkgs.lib.genAttrs ["x86_64-linux" "aarch64-linux"];
   in {
     nixosModules = {
-      hjem = ./modules/nixos;
+      hjem = {
+        imports = [
+          self.nixosModules.hjem-lib
+          ./modules/nixos
+        ];
+      };
+      hjem-lib = {
+        lib,
+        pkgs,
+        ...
+      }: {
+        _module.args.hjem-lib = import ./lib.nix {inherit lib pkgs;};
+      };
       default = self.nixosModules.hjem;
     };
 
@@ -85,5 +97,11 @@
           '';
         }
     );
+
+    hjem-lib = forAllSystems (system:
+      import ./lib.nix {
+        inherit (nixpkgs) lib;
+        pkgs = nixpkgs.legacyPackages.${system};
+      });
   };
 }

lib.nix

@@ -1,147 +1,147 @@
 {
-  config,
   lib,
-  osOptions,
   pkgs,
-  ...
 }: let
   inherit (builtins) isList;
   inherit (lib.modules) mkDefault mkDerivedConfig mkIf mkMerge;
   inherit (lib.options) literalExpression mkEnableOption mkOption;
   inherit (lib.strings) concatMapStringsSep hasPrefix;
-  inherit (lib.types) addCheck anything attrsOf bool either functionTo lines nullOr path str submodule;
+  inherit (lib.types) addCheck anything attrsOf bool either functionTo int lines listOf nullOr oneOf path str submodule;
-  cfg = config;
 in {
-  _module.args.hjem = {
+  # inlined from https://github.com/NixOS/nixpkgs/tree/master/nixos/modules/config/shells-environment.nix
-    envVarType = osOptions.environment.variables.type;
+  # using osOptions precludes using hjem (or this type) standalone
+  envVarType = attrsOf (nullOr (oneOf [(listOf (oneOf [int str path])) int str path]));
 
-    fileTypeRelativeTo = rootDir:
+  fileTypeRelativeTo = {
-      submodule ({
+    rootDir,
-        name,
+    clobberDefault,
-        target,
+    clobberDefaultText,
-        config,
+  }:
-        options,
+    submodule ({
-        ...
+      name,
-      }: {
+      target,
-        options = {
+      config,
-          enable =
+      options,
-            mkEnableOption "creation of this file"
+      ...
-            // {
+    }: {
-              default = true;
+      options = {
-              example = false;
+        enable =
-            };
+          mkEnableOption "creation of this file"
-
+          // {
-          target = mkOption {
+            default = true;
-            type = str;
+            example = false;
-            apply = p:
-              if hasPrefix "/" p
-              then throw "This option cannot handle absolute paths yet!"
-              else "${config.relativeTo}/${p}";
-            defaultText = "name";
-            description = ''
-              Path to target file relative to {option}`hjem.users.<name>.files.<file>.relativeTo`.
-            '';
           };
 
-          text = mkOption {
+        target = mkOption {
-            default = null;
+          type = str;
-            type = nullOr lines;
+          apply = p:
-            description = "Text of the file";
+            if hasPrefix "/" p
-          };
+            then throw "This option cannot handle absolute paths yet!"
+            else "${config.relativeTo}/${p}";
+          defaultText = "name";
+          description = ''
+            Path to target file relative to {option}`hjem.users.<name>.files.<file>.relativeTo`.
+          '';
+        };
 
-          source = mkOption {
+        text = mkOption {
-            type = nullOr path;
+          default = null;
-            default = null;
+          type = nullOr lines;
-            description = "Path of the source file or directory";
+          description = "Text of the file";
-          };
+        };
 
-          generator = lib.mkOption {
+        source = mkOption {
-            # functionTo doesn't actually check the return type, so do that ourselves
+          type = nullOr path;
-            type = addCheck (nullOr (functionTo (either options.source.type options.text.type))) (x: let
+          default = null;
-              generatedValue = x config.value;
+          description = "Path of the source file or directory";
-              generatesDrv = options.source.type.check generatedValue;
+        };
-              generatesStr = options.text.type.check generatedValue;
-            in
-              x != null -> (generatesDrv || generatesStr));
-            default = null;
-            description = ''
-              Function that when applied to `value` will create the `source` or `text` of the file.
 
-              Detection is automatic, as we check if the `generator` generates a derivation or a string after applying to `value`.
+        generator = lib.mkOption {
-            '';
+          # functionTo doesn't actually check the return type, so do that ourselves
-            example = literalExpression "lib.generators.toGitINI";
+          type = addCheck (nullOr (functionTo (either options.source.type options.text.type))) (x: let
-          };
+            generatedValue = x config.value;
+            generatesDrv = options.source.type.check generatedValue;
+            generatesStr = options.text.type.check generatedValue;
+          in
+            x != null -> (generatesDrv || generatesStr));
+          default = null;
+          description = ''
+            Function that when applied to `value` will create the `source` or `text` of the file.
 
-          value = lib.mkOption {
+            Detection is automatic, as we check if the `generator` generates a derivation or a string after applying to `value`.
-            type = nullOr (attrsOf anything);
+          '';
-            default = null;
+          example = literalExpression "lib.generators.toGitINI";
-            description = "Value passed to the `generator`.";
+        };
-            example = {
-              user.email = "me@example.com";
-            };
-          };
 
-          executable = mkOption {
+        value = lib.mkOption {
-            type = bool;
+          type = nullOr (attrsOf anything);
-            default = false;
+          default = null;
-            example = true;
+          description = "Value passed to the `generator`.";
-            description = ''
+          example = {
-              Whether to set the execute bit on the target file.
+            user.email = "me@example.com";
-            '';
-          };
-
-          clobber = mkOption {
-            type = bool;
-            default = cfg.clobberFiles;
-            defaultText = literalExpression "config.hjem.clobberByDefault";
-            description = ''
-              Whether to "clobber" existing target paths.
-
-              - If using the **systemd-tmpfiles** hook (Linux only), tmpfile rules
-                will be constructed with `L+` (*re*create) instead of `L`
-                (create) type while this is set to `true`.
-            '';
-          };
-
-          relativeTo = mkOption {
-            internal = true;
-            type = path;
-            default = rootDir;
-            description = "Path to which symlinks will be relative to";
-            apply = x:
-              assert (hasPrefix "/" x || abort "Relative path ${x} cannot be used for files.<file>.relativeTo"); x;
           };
         };
 
-        config = let
+        executable = mkOption {
-          generatedValue = config.generator config.value;
+          type = bool;
-          hasGenerator = config.generator != null;
+          default = false;
-          generatesDrv = options.source.type.check generatedValue;
+          example = true;
-          generatesStr = options.text.type.check generatedValue;
+          description = ''
-        in
+            Whether to set the execute bit on the target file.
-          mkMerge [
+          '';
-            {
+        };
-              target = mkDefault name;
-              source = mkIf (config.text != null) (mkDerivedConfig options.text (text:
-                pkgs.writeTextFile {
-                  inherit name text;
-                  inherit (config) executable;
-                }));
-            }
 
-            (lib.mkIf (hasGenerator && generatesDrv) {
+        clobber = mkOption {
-              source = mkDefault generatedValue;
+          type = bool;
-            })
+          default = clobberDefault;
+          defaultText = clobberDefaultText;
+          description = ''
+            Whether to "clobber" existing target paths.
 
-            (lib.mkIf (hasGenerator && generatesStr) {
+            - If using the **systemd-tmpfiles** hook (Linux only), tmpfile rules
-              text = mkDefault generatedValue;
+              will be constructed with `L+` (*re*create) instead of `L`
-            })
+              (create) type while this is set to `true`.
-          ];
+          '';
-      });
+        };
 
-    toEnv = env:
+        relativeTo = mkOption {
-      if isList env
+          internal = true;
-      then concatMapStringsSep ":" toString env
+          type = path;
-      else toString env;
+          default = rootDir;
-  };
+          description = "Path to which symlinks will be relative to";
+          apply = x:
+            assert (hasPrefix "/" x || abort "Relative path ${x} cannot be used for files.<file>.relativeTo"); x;
+        };
+      };
+
+      config = let
+        generatedValue = config.generator config.value;
+        hasGenerator = config.generator != null;
+        generatesDrv = options.source.type.check generatedValue;
+        generatesStr = options.text.type.check generatedValue;
+      in
+        mkMerge [
+          {
+            target = mkDefault name;
+            source = mkIf (config.text != null) (mkDerivedConfig options.text (text:
+              pkgs.writeTextFile {
+                inherit name text;
+                inherit (config) executable;
+              }));
+          }
+
+          (lib.mkIf (hasGenerator && generatesDrv) {
+            source = mkDefault generatedValue;
+          })
+
+          (lib.mkIf (hasGenerator && generatesStr) {
+            text = mkDefault generatedValue;
+          })
+        ];
+    });
+
+  toEnv = env:
+    if isList env
+    then concatMapStringsSep ":" toString env
+    else toString env;
 }

modules/common/user.nix

@@ -4,13 +4,14 @@
 # be avoided here.
 {
   config,
-  hjem,
+  hjem-lib,
   lib,
+  name,
   options,
   pkgs,
   ...
 }: let
-  inherit (hjem) envVarType fileTypeRelativeTo toEnv;
+  inherit (hjem-lib) envVarType toEnv;
   inherit (lib.attrsets) mapAttrsToList;
   inherit (lib.strings) concatLines;
   inherit (lib.modules) mkIf;
@@ -18,13 +19,17 @@
   inherit (lib.types) attrsOf bool listOf package path str;
 
   cfg = config;
+  fileTypeRelativeTo' = rootDir:
+    hjem-lib.fileTypeRelativeTo {
+      inherit rootDir;
+      clobberDefault = cfg.clobberFiles;
+      clobberDefaultText = literalExpression "config.hjem.users.${name}.clobberFiles";
+    };
 in {
   imports = [
     # Makes "assertions" option available without having to duplicate the work
     # already done in the Nixpkgs module.
     (pkgs.path + "/nixos/modules/misc/assertions.nix")
-
-    ../../lib.nix
   ];
 
   options = {
@@ -63,7 +68,7 @@ in {
 
     files = mkOption {
       default = {};
-      type = attrsOf (fileTypeRelativeTo cfg.directory);
+      type = attrsOf (fileTypeRelativeTo' cfg.directory);
       example = {".config/foo.txt".source = "Hello World";};
       description = "Files to be managed by Hjem";
     };
@@ -84,7 +89,7 @@ in {
         };
         files = mkOption {
           default = {};
-          type = attrsOf (fileTypeRelativeTo cfg.xdg.cache.directory);
+          type = attrsOf (fileTypeRelativeTo' cfg.xdg.cache.directory);
           example = {"foo.txt".source = "Hello World";};
           description = "Cache files to be managed by Hjem";
         };
@@ -105,7 +110,7 @@ in {
         };
         files = mkOption {
           default = {};
-          type = attrsOf (fileTypeRelativeTo cfg.xdg.config.directory);
+          type = attrsOf (fileTypeRelativeTo' cfg.xdg.config.directory);
           example = {"foo.txt".source = "Hello World";};
           description = "Config files to be managed by Hjem";
         };
@@ -126,7 +131,7 @@ in {
         };
         files = mkOption {
           default = {};
-          type = attrsOf (fileTypeRelativeTo cfg.xdg.data.directory);
+          type = attrsOf (fileTypeRelativeTo' cfg.xdg.data.directory);
           example = {"foo.txt".source = "Hello World";};
           description = "data files to be managed by Hjem";
         };
@@ -147,7 +152,7 @@ in {
         };
         files = mkOption {
           default = {};
-          type = attrsOf (fileTypeRelativeTo cfg.xdg.state.directory);
+          type = attrsOf (fileTypeRelativeTo' cfg.xdg.state.directory);
           example = {"foo.txt".source = "Hello World";};
           description = "state files to be managed by Hjem";
         };

modules/nixos/default.nix

@@ -1,5 +1,6 @@
 {
   config,
+  hjem-lib,
   lib,
   options,
   pkgs,
@@ -10,7 +11,7 @@
   inherit (lib.options) literalExpression mkOption;
   inherit (lib.strings) optionalString;
   inherit (lib.trivial) pipe;
-  inherit (lib.types) attrs attrsOf bool listOf nullOr package raw submoduleWith either singleLineStr;
+  inherit (lib.types) attrs attrsOf bool either listOf nullOr package raw singleLineStr submoduleWith;
   inherit (lib.meta) getExe;
   inherit (builtins) filter attrNames attrValues mapAttrs getAttr concatLists concatStringsSep typeOf toJSON concatMap;
 
@@ -78,7 +79,7 @@
     specialArgs =
       cfg.specialArgs
       // {
-        inherit pkgs;
+        inherit hjem-lib pkgs;
         osConfig = config;
         osOptions = options;
       };