Add weeder (#1663)

This can be run with ``` nix develop weeder ```
cardano-scaling · Sep 30, 2024 · c8d9173 · c8d9173
2 parents c93142f + aaf7596
commit c8d9173
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diff --git a/cabal.project b/cabal.project
@@ -41,3 +41,6 @@ benchmarks: True
 
 -- Always show detailed output for tests
 test-show-details: direct
+
+program-options
+  ghc-options: -fwrite-ide-info
diff --git a/flake.nix b/flake.nix
@@ -80,6 +80,7 @@
                   cabalProject = builtins.readFile (src + "/cabal.project");
                 };
                 hlint = pkgs.haskell-nix.tool compiler "hlint" "3.8";
+                weeder = pkgs.haskell-nix.tool compiler "weeder" "2.9.0";
                 cardano-cli = inputs.cardano-node.packages.${system}.cardano-cli;
                 cardano-node = inputs.cardano-node.packages.${system}.cardano-node;
                 mithril-client-cli = inputs.mithril.packages.${system}.mithril-client-cli;

diff --git a/nix/hydra/shell.nix b/nix/hydra/shell.nix
@@ -45,6 +45,7 @@ let
     pkgs.treefmt
     # Handy to interact with the hydra-node via websockets
     pkgs.websocat
+    pkgs.weeder
     pkgs.yarn
     pkgs.yq
     # Use latest jq in all shells, to avoid 1.6 bug with large integers.

diff --git a/weeder.toml b/weeder.toml
@@ -0,0 +1,2 @@
+roots = [ "^Main.main$" ]
+type-class-roots = true