chore: reorganise common modules

Signed-off-by: Lander Van den Bulcke <landervandenbulcke@gmail.com>

home/lander/global/default.nix

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+{
+  inputs,
+  lib,
+  config,
+  pkgs,
+  ...
+}: {
+  imports = [
+    ./git
+  ];
+
+  home = {
+    username = "lander";
+    homeDirectory = "/home/lander";
+  };
+
+  programs.home-manager.enable = true;
+  programs.git.enable = true;
+
+  programs.neovim = {
+    enable = true;
+    vimAlias = true;
+    vimdiffAlias = true;
+    defaultEditor = false;
+  };
+
+
+  # Nicely reload system units when changing configs
+  systemd.user.startServices = "sd-switch";
+
+  # https://nixos.wiki/wiki/FAQ/When_do_I_update_stateVersion
+  home.stateVersion = "23.05";
+}

home/lander/global/git/default.nix

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+# adapted from https://pickard.cc/posts/git-identity-home-manager/
+
+{ config, lib, pkgs, ...}:
+
+let
+  # put a shell script into the nix store
+  gitIdentity = 
+    pkgs.writeShellScriptBin "git-identity" (builtins.readFile ./git-identity);
+in {
+  # we will use the excellent fzf in our `git-identity` script, so let's make sure it's available
+  # let's add the gitIdentity script to the path as well
+  home.packages = with pkgs; [
+    gitIdentity
+    fzf
+  ];
+
+  programs.git = {
+    enable = true;
+    package = pkgs.gitAndTools.gitFull;
+
+    extraConfig = {
+      # extremely important, otherwise git will attempt to guess a default user identity. see `man git-config` for more details
+      user.useConfigOnly = true;
+
+      # the `inuits` identity
+      user.inuits.name = "Lander Van den Bulcke";
+      user.inuits.email = "landervdb@inuits.eu";
+
+      # the `olly` identity
+      user.olly.name = "Lander Van den Bulcke";
+      user.olly.email = "landervdb@o11y.eu";
+
+      # the `paynovate` identity
+      user.paynovate.name = "Lander Van den Bulcke";
+      user.paynovate.email = "lander.vandenbulcke@paynovate.com";
+
+      # the `personal` identity
+      user.personal.name = "Lander Van den Bulcke";
+      user.personal.email = "landervandenbulcke@gmail.com";
+
+      # editor
+      core.editor = "vim";
+
+      # line up default branch with github/codeberg/forgejo
+      init.defaultBranch = "main";
+
+      # always rebase xx
+      pull.rebase = true;
+
+      push.autoSetupRemote = true;
+      rebase.autosquash = true;
+      commit.verbose = true;
+      diff.algorithm = "histogram";
+      transfer.fsckobjects = true;
+      fetch.fsckobjects = true;
+      receive.fsckObjects = true;
+      rerere.enabled = true;
+
+      # sign your commits!
+      commit.gpgsign = true;
+    };
+    # This is optional, as `git identity` will call the `git-identity` script by itself, however
+    # setting it up explicitly as an alias gives you autocomplete
+    aliases = {
+      identity = "! git-identity";
+      id = "! git-identity";
+    };
+  };
+}

home/lander/global/git/git-identity

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+#!/usr/bin/env bash
+
+# get each set of usernames from the git config
+IDENTITIES=$(git config --global --name-only --get-regexp "user.*..name" | sed -e 's/^user.//' -e 's/.name$//')
+# filter them with fzf
+ID=$(echo "${IDENTITIES}" | fzf -e -1 +m -q "$1")
+if ! git config --global --get-regexp "user.${ID}.name" > /dev/null; then
+    echo "Please use a valid git identity
+Options:"
+    git config --global --name-only --get-regexp "user.*..name" | sed -e 's/^user.//' -e 's/.name$//' -e 's/^/\t/'
+    exit 1
+fi
+
+# set the id locally in each repo (eg in the repo's .git/config)
+git config user.name "$(git config user.${ID}.name)"
+git config user.email "$(git config user.${ID}.email)"