nix cleanup, instructions to run editor from nix

BUILDING_FROM_SOURCE.md

@@ -80,7 +80,7 @@ If MacOS and using a version >= 10.15:
 
 You may prefer to setup up the volume manually by following nix documentation.
 
-> You my need to restart your terminal
+> You may need to restart your terminal
 
 ### Usage
 
@@ -96,6 +96,32 @@ You should be in a shell with everything needed to build already installed. Next
 
 You should be in a repl now. Have fun!
 
+### Editor
+
+When you want to run the editor from Ubuntu inside nix you need to install [nixGL](https://github.com/guibou/nixGL) as well:
+
+```bash
+nix-shell
+git clone https://github.com/guibou/nixGL
+cd nixGL
+```
+
+If you have an Nvidia graphics card, run:
+```
+nix-env -f ./ -iA nixVulkanNvidia
+```
+If you have integrated intel graphics, run
+```
+nix-env -f ./ -iA nixVulkanIntel
+```
+Check the [nixGL repo](https://github.com/guibou/nixGL) for other configurations.
+
+Next you should be able to run the editor:
+```bash
+cd roc
+nixVulkanNvidia cargo run edit `# replace Nvidia with the config you chose in the previous step`
+```
+
 ## Troubleshooting
 
 Create an issue if you run into problems not listed here.

shell.nix

@@ -13,6 +13,8 @@ with {
   isMacOS = builtins.currentSystem == "x86_64-darwin";
 };
 
+with (pkgs);
+
 let
   darwin-frameworks =
     if isMacOS then
@@ -27,58 +29,58 @@ let
       ]
     else
       [ ];
-  llvm = pkgs.llvm_10;
-  lld = pkgs.lld_10; # this should match llvm's version
-  clang = pkgs.clang_10; # this should match llvm's version
+  llvmPkg = pkgs.llvm_10;
+  lldPkg = pkgs.lld_10; # this should match llvm's version
+  clangPkg = pkgs.clang_10; # this should match llvm's version
   zig = import ./nix/zig.nix { inherit pkgs isMacOS; };
   inputs =
     [
       # build libraries
-      pkgs.rustc
-      pkgs.cargo
-      pkgs.clippy
-      pkgs.rustfmt
-      pkgs.cmake
-      pkgs.git
-      pkgs.python3
-      llvm
-      clang
-      pkgs.valgrind
-      pkgs.pkg-config
+      rustc
+      cargo
+      clippy
+      rustfmt
+      cmake
+      git
+      python3
+      llvmPkg
+      clangPkg
+      valgrind
+      pkg-config
       zig
       # llb deps
-      pkgs.libffi
-      pkgs.libxml2
-      pkgs.xorg.libX11
-      pkgs.zlib
-      pkgs.vulkan-headers
-      pkgs.vulkan-loader
-      pkgs.vulkan-tools
-      pkgs.vulkan-validation-layers
+      libffi
+      libxml2
+      xorg.libX11
+      zlib
+      vulkan-headers
+      vulkan-loader
+      vulkan-tools
+      vulkan-validation-layers
       # faster builds - see https://github.com/rtfeldman/roc/blob/trunk/BUILDING_FROM_SOURCE.md#use-lld-for-the-linker
-      lld
+      lldPkg
       # dev tools
-      pkgs.rust-analyzer
+      rust-analyzer
       # (import ./nix/zls.nix { inherit pkgs zig; })
-      pkgs.ccls
+      ccls
     ];
-in pkgs.mkShell {
+in mkShell {
   buildInputs = inputs ++ darwin-frameworks;
-  LLVM_SYS_100_PREFIX = "${llvm}";
+  LLVM_SYS_100_PREFIX = "${llvmPkg}";
 
-  APPEND_LIBRARY_PATH = pkgs.stdenv.lib.makeLibraryPath [
-      pkgs.pkgconfig
-      pkgs.vulkan-headers
-      pkgs.vulkan-loader
-      pkgs.vulkan-tools
-      pkgs.vulkan-validation-layers
-      pkgs.xorg.libX11
-      pkgs.xorg.libXcursor
-      pkgs.xorg.libXrandr
-      pkgs.xorg.libXi
-      pkgs.libcxx
-      pkgs.libcxxabi
-      pkgs.libunwind
+  APPEND_LIBRARY_PATH = stdenv.lib.makeLibraryPath [
+      pkgconfig
+      vulkan-headers
+      vulkan-loader
+      vulkan-tools
+      vulkan-validation-layers
+      xorg.libX11
+      xorg.libXcursor
+      xorg.libXrandr
+      xorg.libXi
+      libcxx
+      libcxxabi
+      libunwind
     ];
 
   # Aliases don't work cross shell, so we do this