vscode-nix-ide feat: open terminal links for store paths in workspace

These changes register a terminal link handler so that store paths can be handled as files relative to the workspace (if they exist in the workspace).

As it stands, this assumes the store is at /nix/store and that all paths are unix-style (which should cover most (all?) users but I can try to abstract those away if necessary).

fixes #272

Sep 09 '22 18:09 hall

Done in 25.99s.
dz@dz-pc-11:~/github.com/nix-community/vscode-nix-ide$ vsce package 
 INFO  Detected presence of yarn.lock. Using 'yarn' instead of 'npm' (to override this pass '--no-yarn' on the command line).
 ERROR  Extension entrypoint(s) missing. Make sure these files exist and aren't ignored by '.vscodeignore':
  extension/dist/extension.js

no sure how to test, but seems like good solution

Sep 09 '22 19:09 dzmitry-lahoda

no sure how to test

I generally just press F5 with the repo open in VSCode. Then you can open files to test functionality in the newly-created window. No worries if you're not able to though; I'll try to do some more rigorous testing over the weekend

Sep 09 '22 19:09 hall

Marking as draft b/c I haven't done any semi-serious testing yet.

Sep 10 '22 14:09 hall

Yep, need a better determinator than "file exists in workspace" because, of course, there's going to be similarly-named files across unrelated derivatives; for example, this flake

{
  outputs = { self, nixpkgs, ... }@inputs:
    let
      system = "x86_64-linux";
      pkgs = nixpkgs.legacyPackages.${system};
    in
    {
      packages.${system}.default = pkgs.callPackage pkgs.hello { };
    };
}

throws the following error:

❯ nix eval .
error: getting status of '/nix/store/y4mxrg8c6l09lb2szl69vwl4f6441i5k-hello-2.12.1/default.nix': No such file or directory

which would open default.nix, if it existed, in the workspace (which is a completely unrelated file).

My first thought is that the local derivation is always called source (e.g., /nix/store/pa6a7a5b2iqvi5ra7z0vxr6mn343gw53-source) as that's what I've observed in passing; however, that's not the case in @dzmitry-lahoda's screenshot. So I think we need a way to determine the actual derivation path(s); hopefully there's a command which does exactly that.

Sep 10 '22 15:09 hall

in rust, rust analyzer expands procedural macros and builds rs scripts. just to name something which doing ide level evaluation and expansion.

nix is lazy and side effect free. so it can be evaluated, including each src. actually flake check and nix show doing something like that.

so the only final fix is to evaluate whole tree. dump it to json. and use as virtual file tree.

will donate 10 DOT for such solution.

but can with current only root solution is ok if to provide not nix store config, but config for current root src. i can just make my root src to be in subfolder i need. so for most people in simple projects it will work without modification.

choose src or file from multiple on click does not feel good to go.

so current solution with env var for store location and per workspace src configuration can be great.

Sep 10 '22 15:09 dzmitry-lahoda

default.nix, if it existed, in the workspace (which is a completely unrelated file).

oh. that is bad. ruins everything. so it needs evaluation of nix tree and deep integration with nix sql database.

afaik nix is lazy strict dynamics. but when its is evaluated it is not so dynamic.

so really this feature requires a step to real ide - building tree and linking it to "object" database.

Sep 10 '22 15:09 dzmitry-lahoda

dz@dz-pc-11:~/github.com/ComposableFi/cosmoverse-demo$ nix show-derivation .#frontend-static
warning: Git tree '/home/dz/github.com/ComposableFi/cosmoverse-demo' is dirty
{
  "/nix/store/0l1hkkc1xa62p2zg3rd6c39dnmaznq4l-xcvm-dashboard-0.1.0.drv": {
    "outputs": {
      "out": {
        "path": "/nix/store/r0q82x2jq91yb6v61cnml5b9xfsxv7c2-xcvm-dashboard-0.1.0"
      }
    },
    "inputSrcs": [
      "/nix/store/9krlzvny65gdc8s7kpb6lkx8cd02c25b-default-builder.sh",
      "/nix/store/rzznbiy8j0381jlsk3la1njz5ql1na1q-frontend",
      "/nix/store/szyc8a0wsc42p6md02psn4i2smmw2z23-mkyarncache.js"
    ],
    "inputDrvs": {

flake package, app does not work (we need app because we debug). but at least we see src /nix/store/rzznbiy8j0381jlsk3la1njz5ql1na1q-frontend