refactor: change projects -> inputs, make option description more explanatory

examples/_d2n-flake-parts/flake.nix

@@ -16,29 +16,14 @@
   }:
     flake-parts.lib.mkFlake {inherit self;} {
       systems = ["x86_64-linux"];
-      imports = [dream2nix.flakeModule];
+      imports = [dream2nix.flakeModuleBeta];
       dream2nix = {
         config.projectRoot = ./.;
-        projects."ripgrep" = {
+        # define an input for dream2nix to generate outputs for
+        inputs."ripgrep" = {
           source = src;
           settings = [{builder = "crane";}];
         };
       };
-      perSystem = {
-        config,
-        lib,
-        pkgs,
-        ...
-      }: let
-        inherit (config.dream2nix) outputs;
-      in {
-        packages.ripgrep = outputs.packages.ripgrep.overrideAttrs (old: {
-          buildInputs = (old.buildInputs or []) ++ [pkgs.hello];
-          postInstall = ''
-            ${old.postInstall or ""}
-            hello
-          '';
-        });
-      };
     };
 }

flake.nix

@@ -194,7 +194,7 @@
     # kept for compat
     lib2 = d2n-lib;
 
-    flakeModule = {
+    flakeModuleBeta = {
       imports = [./src/modules/flake-parts];
       dream2nix.lib = d2n-lib;
     };

src/modules/flake-parts/implementation.nix

@@ -14,7 +14,7 @@
   outputs = d2n.lib.dlib.mergeFlakes (
     l.map
     (p: d2n.lib.makeFlakeOutputs (makeArgs p))
-    (l.attrValues d2n.projects)
+    (l.attrValues d2n.inputs)
   );
 in {
   config = {

src/modules/flake-parts/interface.nix

@@ -22,14 +22,21 @@ in {
         };
         default = {};
         description = ''
-          The dream2nix config.
+          The dream2nix config. This will be applied to all defined `sources`.
+          You can override this per `source` by specifying `config` for that source:
+          ```nix
+            sources."name" = {
+              config.projectSource = ./source;
+            };
+          ```
         '';
       };
-      projects = l.mkOption {
+      inputs = l.mkOption {
-        type = t.attrsOf t.raw;
+        type = t.attrsOf t.attrs;
         default = {};
         description = ''
-          The projects that outputs will be generated for.
+          A list of inputs to generate outputs from.
+          Each one takes the same arguments `makeFlakeOutputs` takes.
         '';
       };
       outputs = l.mkOption {