A new start

shell/default.nix

@@ -0,0 +1,10 @@
+{ self, inputs, ... }:
+{
+  externalModules = with inputs; [
+    bud.devshellModules.bud
+  ];
+  modules = [
+    ./devos.nix
+  ];
+}
+

shell/devos.nix

@@ -0,0 +1,62 @@
+{ pkgs, extraModulesPath, ... }:
+let
+
+  hooks = import ./hooks;
+
+  pkgWithCategory = category: package: { inherit package category; };
+  linter = pkgWithCategory "linter";
+  docs = pkgWithCategory "docs";
+  devos = pkgWithCategory "devos";
+
+in
+{
+  _file = toString ./.;
+
+  imports = [ "${extraModulesPath}/git/hooks.nix" ];
+  git = { inherit hooks; };
+
+  # tempfix: remove when merged https://github.com/numtide/devshell/pull/123
+  devshell.startup.load_profiles = pkgs.lib.mkForce (
+    pkgs.lib.noDepEntry ''
+      # PATH is devshell's exorbitant privilige:
+      # fence against its pollution
+      _PATH=''${PATH}
+      # Load installed profiles
+      for file in "$DEVSHELL_DIR/etc/profile.d/"*.sh; do
+        # If that folder doesn't exist, bash loves to return the whole glob
+        [[ -f "$file" ]] && source "$file"
+      done
+      # Exert exorbitant privilige and leave no trace
+      export PATH=''${_PATH}
+      unset _PATH
+    ''
+  );
+
+  packages = with pkgs; [
+    git-crypt
+  ];
+
+  commands = with pkgs; [
+    (devos nixUnstable)
+    {
+      category = "devos";
+      name = nvfetcher-bin.pname;
+      help = nvfetcher-bin.meta.description;
+      command = "cd $DEVSHELL_ROOT/pkgs; ${pkgs.nvfetcher-bin}/bin/nvfetcher -c ./sources.toml --no-output $@";
+    }
+    (linter nixpkgs-fmt)
+    (linter editorconfig-checker)
+    # (docs python3Packages.grip) too many deps
+    (docs mdbook)
+  ]
+
+  ++ lib.optional
+    (pkgs ? deploy-rs)
+    (devos deploy-rs.deploy-rs)
+
+  ++ lib.optional
+    (system != "i686-linux")
+    (devos cachix)
+
+  ;
+}

shell/hooks/default.nix

@@ -0,0 +1,4 @@
+{
+  enable = true;
+  pre-commit.text = builtins.readFile ./pre-commit.sh;
+}

shell/hooks/pre-commit.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+if git rev-parse --verify HEAD >/dev/null 2>&1
+then
+  against=HEAD
+else
+  # Initial commit: diff against an empty tree object
+  against=$(${git}/bin/git hash-object -t tree /dev/null)
+fi
+
+diff="git diff-index --name-only --cached $against --diff-filter d"
+
+nix_files=($($diff -- '*.nix'))
+all_files=($($diff))
+
+# Format staged nix files.
+if [[ -n "${nix_files[@]}" ]]; then
+  nixpkgs-fmt "${nix_files[@]}" \
+  && git add "${nix_files[@]}"
+fi
+
+# check editorconfig
+editorconfig-checker -- "${all_files[@]}"
+if [[ $? != '0' ]]; then
+  printf "%b\n" \
+    "\nCode is not aligned with .editorconfig" \
+    "Review the output and commit your fixes" >&2
+  exit 1
+fi