From 46fafb70ac928e81a7ba34408464f20c21febaa1 Mon Sep 17 00:00:00 2001
From: XNM <artem.shv@proton.me>
Date: Sun, 12 Nov 2023 19:33:55 +0200
Subject: [PATCH] added dev shell example for Rust

---
 .../optimized-pre-config-rust/.cargo/config   |  1 +
 .../optimized-pre-config-rust/Cargo.toml      | 20 ++++++++
 .../optimized-pre-config-rust/flake.nix       | 47 +++++++++++++++++++
 .../rust-toolchain.toml                       | 10 ++++
 nixos/configuration.nix                       |  1 +
 5 files changed, 79 insertions(+)
 create mode 100644 home/Projects/optimized-pre-config-rust/.cargo/config
 create mode 100644 home/Projects/optimized-pre-config-rust/Cargo.toml
 create mode 100644 home/Projects/optimized-pre-config-rust/flake.nix
 create mode 100644 home/Projects/optimized-pre-config-rust/rust-toolchain.toml

diff --git a/home/Projects/optimized-pre-config-rust/.cargo/config b/home/Projects/optimized-pre-config-rust/.cargo/config
new file mode 100644
index 0000000..bf0d4e9
--- /dev/null
+++ b/home/Projects/optimized-pre-config-rust/.cargo/config
@@ -0,0 +1 @@
+rustflags = ["-C", "link-arg=-fuse-ld=/path/to/mold", "-Zcodegen-backend=cranelift" ] # Change '/path/to/mold' and DON'T use it in production, only for dev needs
diff --git a/home/Projects/optimized-pre-config-rust/Cargo.toml b/home/Projects/optimized-pre-config-rust/Cargo.toml
new file mode 100644
index 0000000..46f0188
--- /dev/null
+++ b/home/Projects/optimized-pre-config-rust/Cargo.toml
@@ -0,0 +1,20 @@
+### Cargo code snippets for different optimizations
+
+## Dev build compilation speed optimization (more https://benw.is/posts/how-i-improved-my-rust-compile-times-by-seventy-five-percent)
+# Work only with nightly version of Rust by the time when it was written, also DON'T use it in production for now
+cargo-features = ["codegen-backend"]
+# Important: It provides less useful error messages during compilation
+[profile.dev]
+opt-level = 1
+codegen-backend = "cranelift"
+[profile.dev.package."*"]
+opt-level = 3
+codegen-backend = "cranelift"
+
+## Release build size optimization (more https://github.com/johnthagen/min-sized-rust)
+[profile.release]
+strip = true
+opt-level = "z" # Also can try 's' instead of 'z'
+lto = true
+codegen-units = 1
+panic = "abort"
diff --git a/home/Projects/optimized-pre-config-rust/flake.nix b/home/Projects/optimized-pre-config-rust/flake.nix
new file mode 100644
index 0000000..5805233
--- /dev/null
+++ b/home/Projects/optimized-pre-config-rust/flake.nix
@@ -0,0 +1,47 @@
+{
+  description = "A devShell for Rust Development";
+
+  inputs = {
+    nixpkgs.url      = "github:NixOS/nixpkgs/nixos-unstable";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    flake-utils.url  = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, rust-overlay, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs {
+          inherit system overlays;
+        };
+      in
+      with pkgs;
+      {
+        devShells.default = mkShell {
+          buildInputs = [
+            (rust-bin.fromRustupToolchainFile ./rust-toolchain.toml)
+            mold
+            pkg-config
+            openssl
+            sqlite
+            cargo-deny
+            cargo-audit
+            cargo-update
+            cargo-edit
+            cargo-outdated
+            cargo-license
+            cargo-tarpaulin
+            cargo-cross
+            cargo-zigbuild
+            cargo-nextest
+            cargo-spellcheck
+            cargo-modules
+            cargo-bloat
+            taplo
+            bacon
+            helix
+          ];
+        };
+      }
+    );
+}
diff --git a/home/Projects/optimized-pre-config-rust/rust-toolchain.toml b/home/Projects/optimized-pre-config-rust/rust-toolchain.toml
new file mode 100644
index 0000000..69e9adb
--- /dev/null
+++ b/home/Projects/optimized-pre-config-rust/rust-toolchain.toml
@@ -0,0 +1,10 @@
+[toolchain]
+channel = "nightly"
+components = [ "rust-src", "rust-analyzer", "rustc-codegen-cranelift", "miri", "llvm-tools", "rust-docs-json" ]
+targets = [
+    "wasm32-wasi",
+    "wasm32-wasi-preview1-threads",
+    "x86_64-pc-windows-gnu",
+    "x86_64-unknown-linux-gnu",
+  ]
+profile = "default"
diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index 6443d02..9252d93 100644
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -446,6 +446,7 @@
   # List packages installed in system profile. To search, run:
   # $ nix search wget
   environment.systemPackages = with pkgs; [
+    mold
     gcc13
     jdk11
     gleam