commit 8a53607ed9a5018830720e9a009e960afd13b59b
Author: Rachel Lambda Samuelsson <depsterr@protonmail.com>
Date:   Sun Jul 23 01:17:46 2023 +0200

    initial commit

diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.~undo-tree~
diff --git a/example/example.nix b/example/example.nix
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+++ b/example/example.nix
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+{ pkgs, ... }:
+import ../psDeriver.nix {
+  inherit pkgs;
+  deps = [
+    {
+      name = "console";
+      version = "v6.0.0";
+      gitUrl = https://github.com/purescript/purescript-console.git;
+    }
+    {
+      name = "effect";
+      version = "v4.0.0";
+      gitUrl = https://github.com/purescript/purescript-effect.git;
+    }
+    {
+      name = "prelude";
+      version = "v6.0.1";
+      gitUrl = https://github.com/purescript/purescript-prelude.git;
+    }
+  ];
+  out = {
+    name = "example";
+    version = "0.1.0";
+    src = ./src;
+    executable = "example";
+  };
+}
diff --git a/example/shell.nix b/example/shell.nix
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--- /dev/null
+++ b/example/shell.nix
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+let pkgs = import <nixpkgs> {};
+    example = import ./example.nix { inherit pkgs; };
+in pkgs.mkShell {
+  packages = [
+    example
+  ];
+}
diff --git a/example/src/Main.purs b/example/src/Main.purs
new file mode 100644
index 0000000..ff2e1db
--- /dev/null
+++ b/example/src/Main.purs
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+module Main where
+
+import Prelude
+
+import Effect (Effect)
+import Effect.Console (log)
+
+main :: Effect Unit
+main = do
+  log "Hej!"
diff --git a/psDeriver.nix b/psDeriver.nix
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index 0000000..b830b26
--- /dev/null
+++ b/psDeriver.nix
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+# pkgs: nixpkgs
+#
+# nodejs?: node derivation to use for running executables
+#
+# deps:
+# {
+#   name
+#   version
+#   src
+# }
+#
+# or
+#
+# {
+#   name
+#   version
+#   gitUrl
+# }
+#
+# out:
+#
+# {
+#   name
+#   version
+#   src
+#   executable?
+# }
+    
+
+{ pkgs
+, nodejs ? pkgs.nodejs
+, deps
+, out }:
+with pkgs; with builtins;
+let inputs =
+      map (d: stdenv.mkDerivation {
+          name = d.name;
+          version = d.version;
+          src = d.src or fetchGit {
+            url = d.gitUrl;
+            ref = "refs/tags/${d.version}";
+          };
+          installPhase = ''cp -r "$src" "$out"'';
+        })
+        deps;
+in stdenv.mkDerivation {
+  pname = out.name;
+  version = out.version;
+  src = out.src;
+
+  buildInputs = [ purescript ] ++ inputs;
+  
+  buildPhase = ''
+    purs compile "$src/**/*.purs" ${concatStringsSep " "
+      (map (x: ''"${x}/src/**/*.purs"'') inputs)}
+  '' + (if hasAttr "executable" out then ''
+    cat > output/runMain.js <<-EOF
+    import * as Main from "$out/lib/Main/index.js"
+    Main.main()
+    EOF
+
+    cat > ${out.executable} <<-EOF
+    #!/bin/sh
+    exec ${nodejs}/bin/node "$out/lib/runMain.js" "$@"
+    EOF
+  '' else "");
+
+  installPhase = ''
+    mkdir -p "$out/lib"
+    mv output/* "$out/lib"
+  '' + (if hasAttr "executable" out then ''
+    mkdir -p "$out/bin"
+    install -Dm 755 ${out.executable} "$out/bin"
+  '' else "");
+}
diff --git a/readme.md b/readme.md
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+++ b/readme.md
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+# psDeriver
+
+`psDeriver` is a file which lets one define postscript derivations simply. It handles specified dependencies (no dependency tree resolution), and can optionally generate an executable which runs the main function if present.
+
+## Usage
+
+See `example/example.nix` for an example.
+
+Import `psDeriver.nix` and pass the following arguments:
+
+### `pkgs`
+The usual nixpkgs
+
+### `nodejs` (optional)
+Nodejs derivation to use for running executables. If not specified then `pkgs.nodejs` will be used.
+
+### `deps`
+A list of dependencies in one of the following formats:
+
+* `{ name; version; src; }`
+
+* `{ name; version; gitUrl; }`
+
+If the second format is used then version will be used as a tag of the git repository. This is the style demonstrated in `example/example.nix`.
+
+### `out`
+Information about the output derivation, given in the following attributes.
+
+* `name` - name of package
+* `version` - version of package
+* `src` - source directory for purescript code (usually `./src`)
+* `executable` (optional) - if specified an executable with this name will be created which calls `Main.main`.