refactor: extract shell setup

git/default.nix

@@ -0,0 +1,126 @@
+{ pkgs, userName, userEmail, gpgSigningKey, ... }:
+
+{
+  programs = {
+    less.enable = true;
+
+    git = {
+      enable = true;
+
+      inherit userName;
+      inherit userEmail;
+
+      signing = {
+        key = gpgSigningKey;
+        signByDefault = true;
+      };
+
+      difftastic = {
+        enable = true;
+        background = "light";
+      };
+
+      lfs = {
+        enable = true;
+      };
+
+      extraConfig = {
+        core.editor = "nvim";
+        core.pager = "less -FX";
+
+        credential.helper = "cache --timeout=3600";
+
+        diff.ignoreSubmodules = "none";
+
+        fetch.writeCommitGraph = true;
+        fetch.recurseSubmodules = true;
+
+        format.pretty = "format:%C(yellow)%h %Cblue%>(12)%ad %C(red)%G? %Cgreen%<(7,trunc)%aN%Cred%d %Creset%s";
+
+        init.defaultBranch = "main";
+
+        log.date = "relative";
+
+        merge.ff = false;
+        merge.tool = "nvim";
+
+        mergetool.nvim.cmd = "nvim -f -c \"Gdiffsplit!\" \"$MERGED\"";
+        mergetool.prompt = false;
+
+        pager.difftool = true;
+
+        pull.rebase = true;
+
+        push.recurseSubmodules = "on-demand";
+
+        rebase.autostash = true;
+
+        rerere.enabled = true;
+
+        status.submoduleSummary = true;
+
+        submodule.recurse = true;
+
+        worktree.guessRemote = true;
+      };
+
+      aliases = {
+        graph = "log --graph --all --max-count 32";
+      };
+
+      ignores = [
+        ".env"
+        ".direnv"
+        "*.swp"
+      ];
+    };
+  };
+
+  home.packages = with pkgs; [
+    (writeShellScriptBin "git-clone-worktree" ''
+
+      uri=''${1}
+      dir=''${2}
+
+      if [[ -z ''${dir} ]]; then 
+        dir=''$(basename ''${1} .git)
+      fi
+
+      if [[ -e ''${dir} ]]; then
+        echo "error: directory ''${dir} already exists"
+        exit 1
+      fi
+
+      mkdir ''${dir}
+      git clone ''${uri} ''${dir}/.base
+
+      branch=`git -C ''${dir}/.base symbolic-ref --short HEAD`
+      echo "default branch is ''${branch}"
+
+      git -C ''${dir}/.base checkout --detach HEAD
+      git -C ''${dir}/.base worktree add ../''${branch}
+    '')
+
+    (writeShellScriptBin "git-make-relative" ''
+    
+      gitfile=''${1}
+
+      if [[ -z ''${gitfile} ]]; then 
+        gitfile=".git"
+      fi 
+
+      if [[ ! -f ''${gitfile} ]]; then 
+        echo "file ''${gitfile} does not exist"
+        exit 1 
+      fi 
+
+      gitdir=$(grep "gitdir:" ''${gitfile} | cut -d: -f2 | xargs)
+      rel_gitdir=$(realpath -s --relative-to=. ''${gitdir})
+
+      echo "relative path: ''${rel_gitdir}"
+
+      sed -i -e "s,gitdir:.*,gitdir: ''${rel_gitdir}," ''${gitfile}
+    '')
+  ];
+}
+