sam: Add home-manager

This also imports most of the home-manager config from oscar.

sam/configuration.nix

@@ -4,6 +4,7 @@
   imports =
     [
       ./hardware-configuration.nix
+      (import "${builtins.fetchTarball https://github.com/nix-community/home-manager/archive/release-25.05.tar.gz}/nixos")
     ];
 
   # https://discourse.nixos.org/t/github-strategies-for-configuration-nix/1983/14
@@ -64,16 +65,86 @@
     isNormalUser = true;
     description = "Chandler Swift";
     extraGroups = [ "networkmanager" "wheel" "docker"];
-    packages = with pkgs; [
+  };
+  home-manager.users.chandler = { pkgs, ... }: {
+    home.packages = with pkgs; [
       kdePackages.kate
     ];
+
+    programs.bash = {
+      enable = true;
+      historyControl = [ "ignoredups" "ignorespace" ];
+    };
+
+    programs.direnv = {
+      enable = true;
+      enableBashIntegration = true;
+      nix-direnv.enable = true;
+    };
+
+    programs.git = {
+      enable = true;
+      userEmail = "chandler@chandlerswift.com";
+      userName = "Chandler Swift";
+      lfs.enable = true;
+      # TODO: delta or diff-so-fancy or difftastic
+      extraConfig = {
+        init.defaultBranch = "main";
+        pull.ff = "only";
+        url."https://aur.archlinux.org/".insteadOf = "aur:";
+        url."ssh://aur@aur.archlinux.org/".pushInsteadOf = "aur:";
+        url."ssh://git@github.com/ChandlerSwift/".insteadOf = "gh:";
+        url."ssh://forgejo@bert/chandlerswift/".insteadOf = "forgejo:";
+        push.autoSetupRemote = true;
+        rebase.autosquash = true;
+        rebase.autostash = true;
+        fetch.parallel = 0; # "some reasonable default"
+      };
+      ignores = [
+        "*.kate-swp"
+        "*.swp"
+        "*~"
+        "\\#*\\#"
+        "venv"
+        ".direnv"
+      ];
+      hooks = {
+        pre-commit = ../git-pre-commit-hook;
+      };
+      signing.signByDefault = true;
+      signing.key = null; # "let GnuPG decide what signing key to use depending on commit's author"
+    };
+
+    programs.ssh = {
+      enable = true;
+      addKeysToAgent = "yes";
+      includes = [
+        "config.d/*"
+      ];
+    };
+
+    programs.firefox.enable = true;
+
+    programs.chromium = {
+      enable = true;
+      extensions = [
+        { id = "cjpalhdlnbpafiamejdnhcphjbkeiagm"; } # ublock origin
+      ];
+    };
+
+    programs.atuin = {
+      enable = true;
+      flags = [
+        "--disable-up-arrow"
+      ];
+    };
+
+    home.stateVersion = "25.05";
   };
 
   services.displayManager.autoLogin.enable = true;
   services.displayManager.autoLogin.user = "chandler";
 
-  programs.firefox.enable = true;
-
   virtualisation.docker.enable = true;
 
   environment.systemPackages = with pkgs; [