2 files changed, 121 insertions, 0 deletions
diff --git a/npins/default.nix b/npins/default.nix
new file mode 100644
index 0000000..5e7d086
--- /dev/null
+++ b/npins/default.nix
@@ -0,0 +1,80 @@
+# Generated by npins. Do not modify; will be overwritten regularly
+let
+  data = builtins.fromJSON (builtins.readFile ./sources.json);
+  version = data.version;
+
+  mkSource =
+    spec:
+    assert spec ? type;
+    let
+      path =
+        if spec.type == "Git" then
+          mkGitSource spec
+        else if spec.type == "GitRelease" then
+          mkGitSource spec
+        else if spec.type == "PyPi" then
+          mkPyPiSource spec
+        else if spec.type == "Channel" then
+          mkChannelSource spec
+        else
+          builtins.throw "Unknown source type ${spec.type}";
+    in
+    spec // { outPath = path; };
+
+  mkGitSource =
+    {
+      repository,
+      revision,
+      url ? null,
+      hash,
+      branch ? null,
+      ...
+    }:
+    assert repository ? type;
+    # At the moment, either it is a plain git repository (which has an url), or it is a GitHub/GitLab repository
+    # In the latter case, there we will always be an url to the tarball
+    if url != null then
+      (builtins.fetchTarball {
+        inherit url;
+        sha256 = hash; # FIXME: check nix version & use SRI hashes
+      })
+    else
+      assert repository.type == "Git";
+      let
+        urlToName =
+          url: rev:
+          let
+            matched = builtins.match "^.*/([^/]*)(\\.git)?$" repository.url;
+
+            short = builtins.substring 0 7 rev;
+
+            appendShort = if (builtins.match "[a-f0-9]*" rev) != null then "-${short}" else "";
+          in
+          "${if matched == null then "source" else builtins.head matched}${appendShort}";
+        name = urlToName repository.url revision;
+      in
+      builtins.fetchGit {
+        url = repository.url;
+        rev = revision;
+        inherit name;
+        # hash = hash;
+      };
+
+  mkPyPiSource =
+    { url, hash, ... }:
+    builtins.fetchurl {
+      inherit url;
+      sha256 = hash;
+    };
+
+  mkChannelSource =
+    { url, hash, ... }:
+    builtins.fetchTarball {
+      inherit url;
+      sha256 = hash;
+    };
+in
+if version == 3 then
+  builtins.mapAttrs (_: mkSource) data.pins
+else
+  throw "Unsupported format version ${toString version} in sources.json. Try running `npins upgrade`"
diff --git a/npins/sources.json b/npins/sources.json
new file mode 100644
index 0000000..4aaef0d
--- /dev/null
+++ b/npins/sources.json
@@ -0,0 +1,41 @@
+{
+  "pins": {
+    "gomod2nix": {
+      "type": "Git",
+      "repository": {
+        "type": "GitHub",
+        "owner": "tweag",
+        "repo": "gomod2nix"
+      },
+      "branch": "master",
+      "revision": "31b6d2e40b36456e792cd6cf50d5a8ddd2fa59a1",
+      "url": "https://github.com/tweag/gomod2nix/archive/31b6d2e40b36456e792cd6cf50d5a8ddd2fa59a1.tar.gz",
+      "hash": "0b8cmc8dk34pgcac5s1jvryfcn8kyhbzhh1i22rzv5kf00f09lhb"
+    },
+    "nixpkgs": {
+      "type": "Git",
+      "repository": {
+        "type": "GitHub",
+        "owner": "NixOS",
+        "repo": "nixpkgs"
+      },
+      "branch": "nixpkgs-unstable",
+      "revision": "e6cea36f83499eb4e9cd184c8a8e823296b50ad5",
+      "url": "https://github.com/NixOS/nixpkgs/archive/e6cea36f83499eb4e9cd184c8a8e823296b50ad5.tar.gz",
+      "hash": "13xygz94ax0c63kn59pdlscl2pm6srqn0vfw7r4fvsmassj87mar"
+    },
+    "pre-commit-hooks": {
+      "type": "Git",
+      "repository": {
+        "type": "GitHub",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix"
+      },
+      "branch": "master",
+      "revision": "cc4d466cb1254af050ff7bdf47f6d404a7c646d1",
+      "url": "https://github.com/cachix/pre-commit-hooks.nix/archive/cc4d466cb1254af050ff7bdf47f6d404a7c646d1.tar.gz",
+      "hash": "1gl1bdnv533jyvj12dfyg8q5haprapswnn7hbpikb2qbnnwc2xzd"
+    }
+  },
+  "version": 3
+}
\ No newline at end of file