Avoid flake inputs using fetchGit

Author: srid

flake.lock

@@ -1,8 +1,7 @@
 {
   description = "A `flake-parts` module for Haskell development";
-  inputs.nix-parsec.url = "github:kanwren/nix-parsec";
-  outputs = { self, nix-parsec, ... }: {
-    flakeModule = import ./nix/flake-module.nix { inherit nix-parsec; };
+  outputs = { self, ... }: {
+    flakeModule = ./nix/flake-module.nix;
     templates.default = {
       description = "A simple flake.nix using haskell-flake";
       path = builtins.path { path = ./example; filter = path: _: baseNameOf path == "flake.nix"; };

flake.nix

@@ -1,7 +1,7 @@
-{ pkgs, lib, parsec, ... }:
+{ pkgs, lib, ... }:
 
 let
-  parser = import ./parser.nix { inherit pkgs lib parsec; };
+  parser = import ./parser.nix { inherit pkgs lib; };
   traversal = rec {
     findSingleCabalFile = path:
       let

nix/find-cabal-paths.nix

@@ -1,5 +1,3 @@
-{ nix-parsec }:
-
 # A flake-parts module for Haskell cabal projects.
 { self, config, lib, flake-parts-lib, withSystem, ... }:
 
@@ -15,7 +13,6 @@ let
     raw;
 in
 {
-  _file = __curPos.file;
   options = {
     perSystem = mkPerSystemOption
       ({ config, self', inputs', pkgs, system, ... }:
@@ -199,16 +196,17 @@ in
                   packages = mkOption {
                     type = types.lazyAttrsOf packageSubmodule;
                     description = ''
-                      Attrset of local packages in the project repository.
+                      Set of local packages in the project repository.
 
-                      Autodiscovered by default by looking for `.cabal` files in
-                      top-level or sub-directories.
+                      If you have a `cabal.project` file (under `projectRoot`),
+                      those packages are automatically discovered. Otherwise, a
+                      top-level .cabal or package.yaml file is used to discover
+                      the single local project.
                     '';
                     default =
                       let
                         find-cabal-paths = import ./find-cabal-paths.nix {
                           inherit pkgs lib;
-                          inherit (nix-parsec.lib) parsec;
                         };
                       in
                       lib.mapAttrs

nix/flake-module.nix

@@ -1,5 +1,14 @@
-{ pkgs, lib, parsec, ... }:
+{ pkgs, lib, ... }:
 
+let
+  nix-parsec = builtins.fetchGit {
+    url = "https://github.com/kanwren/nix-parsec.git";
+    ref = "master";
+    rev = "1bf25dd9c5de1257a1c67de3c81c96d05e8beb5e";
+    shallow = true;
+  };
+  inherit (import nix-parsec) parsec;
+in
 {
   # Extract the "packages" list from a cabal.project file.
   parseCabalProjectPackages = cabalProjectFile: