chore(nix): add shell.nix to support nix builds

README.md

@@ -175,6 +175,8 @@ $ # Arch
 $ pacman -S --needed gtk3 glib2 webkit2gtk-4.1 libsoup3
 ```
 
+A `shell.nix` is provided for nix/NixOS builds; instructions are contained within the file [here](chat/shell.nix).
+
 ## Commands
 
 - `:TabnineStatus` - to print Tabnine status

chat/shell.nix

@@ -0,0 +1,43 @@
+# shell.nix
+#
+# this is a nix file which can create a shell with the dependencies necessary 
+# to build tabnine-chat. It assumes you're reasonably familiar with the nix 
+# toolchain.
+#
+# To use it:
+#
+# $ cd chat
+# $ nix-shell
+# these 11 paths will be fetched (156.39 MiB download, 739.97 MiB unpacked):
+#   /nix/store/z8dx4c6z528qi2w1p38yzg17g8q5jnln-cargo-1.77.2
+# <snip...>
+# [nix-shell]$ cargo build --release
+#    Compiling serde v1.0.164
+# <snip...>
+#    Compiling tabnine_chat v0.1.0 (/home/sean/Work/tabnine-nvim/chat)
+#     Finished release [optimized] target(s) in 1m 42s
+#
+# built against 960fae2187687ff0929775ffedb6f05172b990d2 with nixos 24.05
+#
+# A flake could have been provided, but given that tabnine-nvim is often 
+# managed by lazy, can change quite frequently and is a bit divorced from the 
+# nix ecosystem, it seemed that a reasonable solution was just to support the 
+# cargo build process inside the chat directory.
+
+{ pkgs ? import <nixpkgs> {} }:
+  pkgs.mkShell rec {
+    buildInputs = with pkgs; [
+      cargo
+      rustc
+      pkg-config
+    ];
+
+    nativeBuildInputs = with pkgs; [
+      glib
+      gdk-pixbuf
+      libsoup_3
+      pango
+      gtk3
+      webkitgtk_4_1
+    ];
+  }