core: wrap nix-build and nix-shell with default log format

nix-os/core.nix

@@ -4,6 +4,26 @@
 
 { config, pkgs, lib, ... }:
 
+let
+  /*
+   * pkgs: package - nixpkgs package
+   * exe: string - executable (under bin) in pkgs
+   * wrapperArgs: string[] - arguments to pass to the wrapper
+   */
+  mkWrappedExecutable = {pkg, exe ? pkg.meta.mainProgram, wrapperArgs}: let inherit (pkgs) lib makeWrapper; in pkgs.stdenv.mkDerivation {
+    name = "${pkg.name}-wrap-${exe}";
+    nativeBuildInputs = [ makeWrapper ];
+    phases = ["installPhase"];
+    installPhase = ''
+      mkdir -p $out/bin
+      makeWrapper ${pkg}/bin/${exe} $out/bin/${exe} ${lib.concatStringsSep " " wrapperArgs}
+    '';
+  };
+  wrapedNixPrograms = [
+    (mkWrappedExecutable {pkg = pkgs.nix; exe = "nix-build"; wrapperArgs = ["--add-flags" "\"--log-format\"" "--add-flags" "bar-with-logs"];})
+    (mkWrappedExecutable {pkg = pkgs.nix; exe = "nix-shell"; wrapperArgs = ["--add-flags" "\"--log-format\"" "--add-flags" "bar"];})
+  ];
+in
 {
   # kernel
   boot.kernelPackages = pkgs.linuxPackages_latest;
@@ -26,7 +46,7 @@
     ranger
     smartmontools
     ddrescue
-  ];
+  ] ++ wrapedNixPrograms;
 
   programs.git.enable = true;
   programs.git.config = {