From 06b6c858d2bf39a6007942727825fd9df1577463 Mon Sep 17 00:00:00 2001
From: Raito Bezarius <masterancpp@gmail.com>
Date: Fri, 22 Mar 2024 02:39:04 +0100
Subject: [PATCH] flakemelt: init

Signed-off-by: Raito Bezarius <masterancpp@gmail.com>
---
 README.md          |  3 +++
 bootstrap.nix      |  3 +++
 default.nix        | 38 +++++++++++++++++++++++++++++++++++++
 flake.nix          |  3 +++
 npins/default.nix  | 47 ++++++++++++++++++++++++++++++++++++++++++++++
 npins/sources.json | 17 +++++++++++++++++
 6 files changed, 111 insertions(+)
 create mode 100644 README.md
 create mode 100644 bootstrap.nix
 create mode 100644 default.nix
 create mode 100644 flake.nix
 create mode 100644 npins/default.nix
 create mode 100644 npins/sources.json

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..22dc9e1
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# `flakemelt`
+
+Melt your vanilla Nix expressions into a Flake.
diff --git a/bootstrap.nix b/bootstrap.nix
new file mode 100644
index 0000000..0735cb6
--- /dev/null
+++ b/bootstrap.nix
@@ -0,0 +1,3 @@
+(import ./. {
+  lib = (import ./npins)."nixpkgs.lib" { };
+})
diff --git a/default.nix b/default.nix
new file mode 100644
index 0000000..6bd7d24
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,38 @@
+{ 
+  _bootstrapImportDependency ?
+  source:
+    if source ? outPath then _bootstrapImportDependency (import source) 
+    else
+      let
+        evil = builtins.tryEval (source {});
+      in
+      if evil.success then evil.result else source,
+  sources ? (import ./npins), nixpkgs-lib ? _bootstrapImportDependency sources.nixpkgs-lib, lib ? nixpkgs-lib.lib }:
+{
+  lib = rec {
+    importDependency = _bootstrapImportDependency;
+    melt = defaultNixFile: flakeInputs: 
+    let
+      outputFun = import defaultNixFile;
+      dependencies = builtins.mapAttrs (n: s: importDependency s) sources;
+      outputs = 
+      if builtins.isFunction outputFun then outputFun dependencies else outputFun;
+    in
+    outputs;
+  };
+
+  # This works because static.
+#  checks.x86_64-linux.test = derivation {
+#    name = "test-derivation";
+#    builder = ":";
+#    system = "x86_64-linux";
+#  };
+
+  checks = lib.genAttrs [ "x86_64-linux" ] (system: {
+    test = derivation {
+      name = "test-derivation";
+      builder = ":";
+      inherit system;
+    };
+  });
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..b641dd2
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,3 @@
+{
+  outputs = { ... }@inputs: (import ./bootstrap.nix).lib.melt ./default.nix inputs;
+}
diff --git a/npins/default.nix b/npins/default.nix
new file mode 100644
index 0000000..4a7c372
--- /dev/null
+++ b/npins/default.nix
@@ -0,0 +1,47 @@
+# 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, ... }:
+    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"; builtins.fetchGit {
+      url = repository.url;
+      rev = revision;
+      # 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..59de645
--- /dev/null
+++ b/npins/sources.json
@@ -0,0 +1,17 @@
+{
+  "pins": {
+    "nixpkgs-lib": {
+      "type": "Git",
+      "repository": {
+        "type": "GitHub",
+        "owner": "RaitoBezarius",
+        "repo": "nixpkgs.lib"
+      },
+      "branch": "no-flakes",
+      "revision": "33ea5c4f5096de9796428d5137aa009834231dc9",
+      "url": "https://github.com/RaitoBezarius/nixpkgs.lib/archive/33ea5c4f5096de9796428d5137aa009834231dc9.tar.gz",
+      "hash": "0cg8b91xcs2z8qk7v5qd40019yhln2wph18p46khi6nwqs1w0mhs"
+    }
+  },
+  "version": 3
+}