refactor(home): extract git config to its own file

programs/git.nix

@@ -0,0 +1,47 @@
+{ pkgs, ... }:
+
+{
+  programs.git = {
+    enable = true;
+    package = pkgs.gitAndTools.gitFull;
+
+    userEmail = "pierre@front-commerce.com";
+    userName = "Pierre Martin";
+
+    aliases = {
+      co = "checkout";
+      mr = "!sh -c 'git fetch $1 merge-requests/$2/head:mr-$1-$2 && git checkout mr-$1-$2' -";
+    };
+
+    ignores = [
+      ".DS_Store"
+      ".svn"
+      "*~"
+      "*.swp"
+      "*.rbc"
+      ".watsonrc"
+      ".idea"
+      ".vscode"
+    ];
+
+    extraConfig = {
+      # see https://github.com/dandavison/delta#get-started
+      core.pager = "delta";
+      interactive.diffFilter = "delta --color-only";
+      delta.navigate = true;
+      merge.conflictstyle = "diff3";
+      diff.colorMoved = "default";
+
+      merge.tool = "meld";
+      diff.algorithm = "patience";
+      pull.ff = "only";
+      credential.helper = "store";
+      init.defaultBranch = "main";
+
+      # see https://betterprogramming.pub/8-advanced-git-commands-university-wont-teach-you-fe63b483d34b
+      help.autocorrect = 1;
+      fetch.prune = true;
+      push.autoSetupRemote = true;
+    };
+  };
+}