Merge pull request #335438 from linj-fork/pr/refactor-emacs-tsc

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{ lib

, symlinkJoin

, melpaBuild

, fetchFromGitHub

, rustPlatform

, runtimeShell

, writeScript

, python3

, nix-prefetch-github

, nix

, stdenv

, nix-update-script

}:

let

  libExt = stdenv.hostPlatform.extensions.sharedLibrary;

  srcMeta = lib.importJSON ./src.json;

  inherit (srcMeta) version;

  src = fetchFromGitHub srcMeta.src;

  tsc = melpaBuild {

    inherit src;

    inherit version;

    pname = "tsc";

  tsc-dyn = rustPlatform.buildRustPackage rec {

    pname = "tsc-dyn";

    version = "0.18.0";

    sourceRoot = "${src.name}/core";

    src = fetchFromGitHub {

      owner = "emacs-tree-sitter";

      repo = "emacs-tree-sitter";

      rev = version;

      hash = "sha256-LrakDpP3ZhRQqz47dPcyoQnu5lROdaNlxGaQfQT6u+k=";

    };

  tsc-dyn = rustPlatform.buildRustPackage {

    inherit version;

    inherit src;

    pname = "tsc-dyn";

    cargoLock = {

      lockFile = ./Cargo.lock;

      outputHashes = {

        "tree-sitter-0.20.0" = "sha256-hGiJZFrQpO+xHXosbEKV2k64e2D8auNGEtdrFk2SsOU=";

      };

    };

    nativeBuildInputs = [ rustPlatform.bindgenHook ];

    sourceRoot = "${src.name}/core";

    postInstall = ''

      LIB=($out/lib/libtsc_dyn.*)

      TSC_PATH=$out/share/emacs/site-lisp/elpa/tsc-${version}

      install -d $TSC_PATH

      install -m444 $out/lib/libtsc_dyn.* $TSC_PATH/''${LIB/*libtsc_/tsc-}

      echo -n $version > $TSC_PATH/DYN-VERSION

      rm -r $out/lib

      pushd $out/lib

      mv --verbose libtsc_dyn${libExt} tsc-dyn${libExt}

      echo -n $version > DYN-VERSION

      popd

    '';

    inherit (srcMeta) cargoHash;

  };

in melpaBuild {

  pname = "tsc";

  inherit (tsc-dyn) version src;

  files = ''("core/*.el" "${tsc-dyn}/lib/*")'';

in symlinkJoin {

  name = "tsc-${version}";

  paths = [ tsc tsc-dyn ];

  ignoreCompilationError = false;

  passthru = {

    updateScript = let

      pythonEnv = python3.withPackages(ps: [ ps.requests ]);

    in writeScript "tsc-update" ''

      #!${runtimeShell}

      set -euo pipefail

      export PATH=${lib.makeBinPath [

        nix-prefetch-github

        nix

        pythonEnv

      ]}:$PATH

      exec python3 ${builtins.toString ./update.py} ${builtins.toString ./.}

    '';

    inherit tsc-dyn;

    updateScript = nix-update-script { attrPath = "emacsPackages.tsc.tsc-dyn"; };

  };

  meta = {

{

  "src": {

    "owner": "emacs-tree-sitter",

    "repo": "elisp-tree-sitter",

    "rev": "909717c685ff5a2327fa2ca8fb8a25216129361c",

    "hash": "sha256-LrakDpP3ZhRQqz47dPcyoQnu5lROdaNlxGaQfQT6u+k="

  },

  "version": "0.18.0",

  "cargoHash": "sha256-IRCZqszBkGF8anF/kpcPOzHdOP4lAtJBAp6FS5tAOx8="

}

#!/usr/bin/env python3

from textwrap import dedent

from os.path import (

    abspath,

    dirname,

    join,

)

from typing import (

    Dict,

    Any,

)

import subprocess

import tempfile

import json

import sys

import re

import requests

def eval_drv(nixpkgs: str, expr: str) -> Any:

    expr = "\n".join(

        (

            "with (import %s {});" % nixpkgs,

            expr,

        )

    )

    with tempfile.NamedTemporaryFile(mode="w") as f:

        f.write(dedent(expr))

        f.flush()

        p = subprocess.run(

            ["nix-instantiate", "--json", f.name], stdout=subprocess.PIPE, check=True

        )

    return p.stdout.decode().strip()

def get_src(tag_name: str) -> Dict[str, str]:

    p = subprocess.run(

        [

            "nix-prefetch-github",

            "--rev",

            tag_name,

            "--json",

            "emacs-tree-sitter",

            "elisp-tree-sitter",

        ],

        stdout=subprocess.PIPE,

        check=True,

    )

    src = json.loads(p.stdout)

    fields = ["owner", "repo", "rev", "hash"]

    return {f: src[f] for f in fields}

def get_cargo_hash(drv_path: str):

    # Note: No check=True since we expect this command to fail

    p = subprocess.run(["nix-store", "-r", drv_path], stderr=subprocess.PIPE)

    stderr = p.stderr.decode()

    lines = iter(stderr.split("\n"))

    for l in lines:

        if l.startswith("error: hash mismatch in fixed-output derivation"):

            break

    else:

        raise ValueError("Did not find expected hash mismatch message")

    for l in lines:

        m = re.match(r"\s+got:\s+(.+)$", l)

        if m:

            return m.group(1)

    raise ValueError("Could not extract actual hash: ", stderr)

if __name__ == "__main__":

    cwd = sys.argv[1]

    # This should point to the root default.nix of Nixpkgs tree

    nixpkgs = abspath(join(cwd, "../../../../../../.."))

    tag_name = requests.get(

        "https://api.github.com/repos/emacs-tree-sitter/elisp-tree-sitter/releases/latest"

    ).json()["tag_name"]

    src = get_src(tag_name)

    with tempfile.NamedTemporaryFile(mode="w") as f:

        json.dump(src, f)

        f.flush()

        drv_path = eval_drv(

            nixpkgs,

            """

        rustPlatform.buildRustPackage rec {

          pname = "tsc-dyn";

          version = "%s";

          nativeBuildInputs = [ clang ];

          src = fetchFromGitHub (lib.importJSON %s);

          sourceRoot = "${src.name}/core";

          cargoHash = lib.fakeHash;

        }

        """

            % (tag_name, f.name),

        )

    cargo_hash = get_cargo_hash(drv_path)

    with open(join(cwd, "src.json"), mode="w") as f:

        json.dump(

            {

                "src": src,

                "version": tag_name,

                "cargoHash": cargo_hash,

            },

            f,

            indent=2,

        )

        f.write("\n")