setup flake

.envrc

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+use flake

.gitignore

@@ -1 +1,2 @@
 target
+.direnv

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1762111121,
+        "narHash": "sha256-4vhDuZ7OZaZmKKrnDpxLZZpGIJvAeMtK6FKLJYUtAdw=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "b3d51a0365f6695e7dd5cdf3e180604530ed33b4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "A very basic flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }: let
+    pkgs = nixpkgs.legacyPackages."x86_64-linux";
+  in {
+
+    devShells."x86_64-linux".default = pkgs.mkShell {
+      buildInputs = with pkgs; [
+        cargo rustc rustfmt clippy rust-analyzer glibc
+      ];
+      nativeBuildInputs = [ pkgs.pkg-config ];
+      env.RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
+    };
+  };
+}

rustfmt.toml

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+max_width = 80
+hard_tabs = true
+tab_spaces = 4
+newline_style = "Unix"
+use_small_heuristics = "Default"
+fn_call_width = 60
+attr_fn_like_width = 70
+struct_lit_width = 18
+struct_variant_width = 35
+array_width = 60
+chain_width = 60
+single_line_if_else_max_width = 50
+reorder_imports = true
+reorder_modules = true
+remove_nested_parens = true
+short_array_element_width_threshold = 10
+match_arm_leading_pipes = "Never"
+fn_args_layout = "Vertical"
+match_block_trailing_comma = false
+edition = "2021"
+merge_derives = true
+use_try_shorthand = true
+use_field_init_shorthand = true
+force_explicit_abi = true
+disable_all_formatting = false
+
+# --- unstable settings ---
+# indent_style = "Block"
+# wrap_comments = false
+# format_code_in_doc_comments = false
+# doc_comment_code_block_width = 100
+# normalize_comments = false
+# normalize_doc_attributes = false
+# format_strings = false
+# format_macro_matchers = false
+# format_macro_bodies = true
+# hex_literal_case = "Preserve"
+# empty_item_single_line = true
+# struct_lit_single_line = true
+# fn_single_line = false
+# comment_width = 80
+# where_single_line = false
+# imports_indent = "Block"
+# imports_layout = "Mixed"
+# imports_granularity = "Preserve"
+# group_imports = "Preserve"
+# reorder_impl_items = false
+# type_punctuation_density = "Wide"
+# space_before_colon = false
+# space_after_colon = true
+# spaces_around_ranges = false
+# binop_separator = "Front"
+# combine_control_expr = true
+# overflow_delimited_expr = false
+# struct_field_align_threshold = 0
+# enum_discrim_align_threshold = 0
+# match_arm_blocks = true
+# force_multiline_blocks = false
+# brace_style = "SameLineWhere"
+# control_brace_style = "AlwaysSameLine"
+# trailing_semicolon = true
+# trailing_comma = "Vertical"
+# version = "One"
+# blank_lines_upper_bound = 1
+# blank_lines_lower_bound = 0
+# inline_attribute_width = 0
+# format_generated_files = true
+# condense_wildcard_suffixes = false
+# color = "Auto"
+# required_version = "1.5.1"
+# unstable_features = false
+# skip_children = false
+# hide_parse_errors = false
+# error_on_line_overflow = false
+# error_on_unformatted = false
+# ignore = []
+# emit_mode = "Files"
+# make_backup = false

treefmt.toml

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+[formatter.rust]
+command = "rustfmt"
+includes = ["*.rs"]
+
+[formatter.nix]
+command = "alejandra"
+includes = ["*.nix"]