Move to a profile-based configuration where common

This patch makes it so common configuration is now located in shared/
and each host basically just becomes a bunch of import statements.

The exception here is host-specific configuration like the `*.linus.onl`
that live inside `hosts/ahmed/`.

Specifically I have:

- moved common configuration `shared/{nixos,home-manager,nix-darwin}`.
- moved `hosts/common.nix` to `shared/nixos/common-{nix,shell}-settings.nix`.
- split `hosts/muhammed/{dev-utils,neovim}` into per-language
  configuration.

This patch was done in preparation for the arrival of a new host, which
will need to share a lot of configuration with Muhammed.

1 files changed, 49 insertions, 0 deletions

diff --git a/shared/home-manager/git/default.nix b/shared/home-manager/git/default.nix
new file mode 100644
index 0000000..748025d
--- /dev/null
+++ b/shared/home-manager/git/default.nix
@@ -0,0 +1,49 @@
+{
+  pkgs,
+  lib,
+  ...
+}: let
+  inherit (lib) optional;
+  inherit (pkgs.stdenv.hostPlatform) isDarwin;
+in {
+  imports = [
+    ./ignore.nix
+    ./aliases.nix
+  ];
+
+  programs.git = {
+    enable = true;
+
+    # Set privacy-respecting user information.
+    userName = "Linnnus";
+    userEmail = "[email protected]";
+
+    extraConfig = {
+      init.defaultBranch = "master";
+
+      help.autoCorrect = "prompt";
+
+      # Make sure we don't accidentally update submodules with changes that are only available locally.
+      # See: https://git-scm.com/book/en/v2/Git-Tools-Submodules
+      push.recurseSubmodules = "check";
+
+      # It seems like a de facto standard to have a file with this name in the
+      # project root containing all the commits that should be ignored when
+      # running `git blame`.
+      blame.ignoreRevsFile = ".git-blame-ignore-revs";
+
+      credential = {
+        "https://github.com/" = {
+          username = "linnnus";
+          helper = "${pkgs.gh}/bin/gh auth git-credential";
+        };
+        helper = (optional isDarwin "osxkeychain") ++ ["cache"];
+      };
+    };
+  };
+
+  home.packages = with pkgs; [
+    # Add the GitHub CLI for authentication.
+    gh
+  ];
+}