flakemelt: init

Signed-off-by: Raito Bezarius <masterancpp@gmail.com>

README.md

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+# `flakemelt`
+
+Melt your vanilla Nix expressions into a Flake.

bootstrap.nix

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+(import ./. {
+  lib = (import ./npins)."nixpkgs.lib" { };
+})

default.nix

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+{ 
+  _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;
+    };
+  });
+}

flake.nix

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+{
+  outputs = { ... }@inputs: (import ./bootstrap.nix).lib.melt ./default.nix inputs;
+}

npins/default.nix

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+# 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`"

npins/sources.json

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+{
+  "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
+}