From 31cc10fe03ff576cab7394b4da1cdeae7f653b84 Mon Sep 17 00:00:00 2001
From: Price Hiller <price@orion-technologies.io>
Date: Fri, 13 Dec 2024 22:42:15 -0600
Subject: [PATCH] refactor(hm/price): improve rust performance

---
 users/price/conf/rust/default.nix | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/users/price/conf/rust/default.nix b/users/price/conf/rust/default.nix
index ec50dda5..0d844343 100644
--- a/users/price/conf/rust/default.nix
+++ b/users/price/conf/rust/default.nix
@@ -9,6 +9,11 @@
       CARGO_HOME = "${config.xdg.dataHome}/cargo";
       RUSTUP_HOME = "${config.xdg.dataHome}/rustup";
       RUST_SRC_PATH = "${pkgs.fenix.complete.rust-src}/lib/rustlib/src/rust/library";
+      #  HACK: Specify openssl info for rust, this is really not a good idea, but it saves me from
+      #  writing per-project shell.nix or `nix-shell -p` nonsense. I'm willing to compromise for my
+      #  laziness.
+      OPENSSL_DIR = "${pkgs.openssl.dev}";
+      OPENSSL_LIB_DIR = "${pkgs.openssl.out}/lib";
     };
     packages = with pkgs; [
       (pkgs.fenix.complete.withComponents [
@@ -21,7 +26,17 @@
       rust-analyzer-nightly
       cargo-watch
       cargo-nextest
+      sccache
     ];
+    file = {
+      # NOTE: This improves the rust edit-build-run cycle. See https://davidlattimore.github.io/posts/2024/02/04/speeding-up-the-rust-edit-build-run-cycle.html
+      "${config.home.sessionVariables.CARGO_HOME}/config.toml".text = ''
+        [build]
+        rustflags = [ "-C", "linker=${pkgs.clang}/bin/clang", "-C", "link-arg=--ld-path=${pkgs.mold-wrapped}/bin/mold" ]
 
+        [profile.dev]
+        split-debuginfo = "unpacked"
+      '';
+    };
   };
 }