Add a nix flake, mainly for the devShell (#41)

Author: FollowTheProcess

.github/codecov.yml

@@ -1,2 +1,2 @@
 ignore:
-  - examples # Demo programs to showcase the library, coverage tracking not needed
+  - examples  # Demo programs to showcase the library, coverage tracking not needed

.github/release-drafter.yml

@@ -39,6 +39,6 @@ categories:
       - dependencies
       - build
 
-template: |
+template: |-
   ## Changes
   $CHANGES

.github/workflows/CI.yml

@@ -13,8 +13,14 @@ concurrency:
 permissions: {}
 
 jobs:
-  ci:
-    name: CI
+  go:
+    name: Go
     permissions:
       contents: read
     uses: FollowTheProcess/ci/.github/workflows/Go.yml@v4
+
+  nix:
+    name: Nix
+    permissions:
+      contents: read
+    uses: FollowTheProcess/ci/.github/workflows/Nix.yml@v4

.gitignore

@@ -1,47 +1,66 @@
 # Allowlisting gitignore template for GO projects prevents us
 # from adding various unwanted local files, such as generated
 # files, developer configurations or IDE-specific files etc.
+#
+# Recommended: Go.AllowList.gitignore
 
 # Ignore everything
 *
 
-# Except these...
-
-# Git/GitHub
+# But not these files...
 !/.gitignore
-!/.gitattributes
-!/.github/**/*
-!.mailmap
-
-# Tangled workflows
-!/.tangled/**/*.yml
 
 # Go
 !*.go
-!go.sum
-!go.mod
-!.goreleaser.yaml
-!.golangci.yml
-!staticcheck.conf
-!**/testdata/**
+!/go.sum
+!/go.mod
+!/.golangci.yml
+!/.goreleaser.yaml
+!*.tmpl
 
-# CodeCov
-!codecov.yml
+# Test fixtures
+!**/testdata/**/*.txt
+!**/testdata/**/*.txtar
+!**/testdata/**/*.http
+!**/testdata/**/*.snap
 
-# General
-!README.md
-!LICENSE
-!docs/**/*
-!examples/**/*
-
-# Typos
-!.typos.toml
+# Go fuzz corpus entries are hashes with no extension
+!**/testdata/fuzz/**
 
 # mise
 !mise.toml
 
-# Copier
-!.copier-answers.yml
+# Git
+!/.gitattributes
+!.gitignore
+!/.mailmap
+
+# GitHub Actions
+!.github/**/*.yml
+!.github/**/*.yaml
+!.github/renovate.json
+
+# Tangled
+!.tangled/**/*.yml
+!.tangled/**/*.yaml
+
+# Docs
+!*.tape
+!*.md
+!/README.md
+!/LICENSE
+
+# Docker
+!/Dockerfile
+
+# Nix
+!*.nix
+!/flake.lock
+!/.envrc
+
+# Other
+!/.typos.toml
+!/.copier-answers.yml
 
 # ...even if they are in subdirectories
 !*/

flake.lock

@@ -0,0 +1,68 @@
+{
+  description = "Simple, fast, opinionated logging for command line applications";
+
+  inputs = {
+    nixpkgs.url = "https://channels.nixos.org/nixpkgs-unstable/nixexprs.tar.xz";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    treefmt-nix = {
+      url = "github:numtide/treefmt-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs =
+    inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      imports = [
+        inputs.treefmt-nix.flakeModule
+      ];
+
+      systems = [
+        "aarch64-linux"
+        "x86_64-linux"
+        "aarch64-darwin"
+        "x86_64-darwin"
+      ];
+
+      perSystem = { pkgs, ... }: {
+        treefmt.programs = {
+          deadnix.enable = true;
+          gofmt.enable = true;
+          nixfmt.enable = true;
+          shellcheck.enable = true;
+          shfmt.enable = true;
+          statix.enable = true;
+          yamlfmt = {
+            enable = true;
+            settings.formatter = {
+              type = "basic";
+              eof_newline = true;
+              indent = 2;
+              pad_line_comments = 2;
+              retain_line_breaks_single = true;
+              scan_folded_as_literal = true;
+              trim_trailing_whitespace = true;
+            };
+          };
+        };
+
+        devShells.default = pkgs.mkShell {
+          packages = with pkgs; [
+            go
+            golangci-lint
+            golangci-lint-langserver
+            goperf
+            gopls
+            gotools
+            mise
+            pkgsite
+            typos
+          ];
+
+          shellHook = ''
+            echo "👋🏻 Welcome to the log devShell!"
+          '';
+        };
+      };
+    };
+}