nixos-configuration/home-manager/modules/git.nix

{ nixosConfig, pkgs, ... }:

{
  programs = {
    git = {
      enable = true;
      userName = nixosConfig.jalr.git.user.name;
      userEmail = nixosConfig.jalr.git.user.email;
      signing = {
        key = nixosConfig.jalr.gpg.defaultKey;
        signByDefault = nixosConfig.jalr.git.signByDefault;
      };
      extraConfig = {
        init.defaultBranch = "main";
        core.pager = "${pkgs.diff-so-fancy}/bin/diff-so-fancy | less --tabs=4 -RFX";
        diff.sops.textconv = "${pkgs.sops}/bin/sops -d";
        pull.ff = "only";
        alias.find-merge = "!sh -c 'commit=$0 && branch=\${1:-HEAD} && (git rev-list $commit..$branch --ancestry-path | cat -n; git rev-list $commit..$branch --first-parent | cat -n) | sort -k2 -s | uniq -f1 -d | sort -n | tail -1 | cut -f2'";
        alias.show-merge = "!sh -c 'merge=$(git find-merge $0 $1) && [ -n \"$merge\" ] && git show $merge'";
      };
    };
    fish = {
      shellAbbrs = {
        ga = "git add";
        gam = "git commit --amend";
        gap = "git add --patch";
        gb = "git branch";
        gbd = "git branch --delete";
        gbl = "git blame";
        gbm = "git branch --move";
        gc = "git clean";
        gcl = "git clone";
        gcm = "git commit --verbose";
        gco = "git checkout";
        gd = "git diff";
        gdc = "git diff --cached";
        gf = "git fetch";
        ginit = "git init";
        gl = "git log";
        gpll = "git pull";
        gpsh = "git push";
        grb = "git rebase --autostash";
        grbi = "git rebase --autostash --interactive --autosquash \(git merge-base HEAD origin/master\)";
        gr = "git restore";
        grs = "git restore --staged";
        grst = "git reset";
        gs = "git status";
        gsh = "git show";
        gsm = "git submodule";
        gsmi = "git submodule init";
        gsmu = "git submodule update";
        gsp = "git stash pop";
        gst = "git stash";
        gsw = "git switch";
        gswc = "git switch -c";
        gwl = "git worktree list";
        gwr = "git worktree remove";
      };
      functions = {
        #function gwa -d 'git worktree add'
        gwa = {
          description = "Add worktree";
          body = ''
            set -l dir (basename $argv[1])
            git worktree add ../$dir -b (whoami)/$argv[1] && cd ../$dir
          '';
        };

        # function git -d 'git wrapper function' --wraps git
        git = {
          description = "git wrapper function";
          wraps = "git";
          body = ''
            if test (count $argv) -eq 0
                command git
                return $status
            else
                switch $argv[1]
                case push
                    command git $argv
                    set -l git_result $status
                    if [ $git_result -eq 128 ]
                        set set_upstream (command git push 3>&1 1>&2 2>&3 3>&- | grep -o 'git push --set-upstream.*$')
                        if [ ! -z "$set_upstream" ]
                        echo "set upstream: $set_upstream"
                            commandline $set_upstream
                            commandline -f repaint
                        end
                    end
                    return $git_result
                case '*'
                    command git $argv
                    return $status
                end
            end
          '';
        };
        git_pick-commit_merge-base_origin_master = {
          description = "fuzzy find a commit hash";
          body = ''
            git log --oneline (git merge-base HEAD origin/master)..HEAD | ${pkgs.fzf}/bin/fzf --preview='git show (echo {} | cut -d" " -f 1)' --preview-window=top:75% | cut -d" " -f 1
          '';
        };
        gfix = {
          description = "git commit --fixup with fuzzy find commmit picker";
          body = ''
            set commit (git_pick-commit_merge-base_origin_master)
            commandline "git commit --fixup=$commit"
          '';
        };
        ".g" = {
          description = "change directory to repository root";
          body = ''
            set git_repo_dir (git rev-parse --show-toplevel 2>/dev/null)
            if [ "$git_repo_dir" ]
              cd $git_repo_dir
            else
              return 1
            end
          '';
        };
        "..g" = {
          description = "change directory to superproject working tree";
          body = ''
            set git_repo_dir (git rev-parse --show-superproject-working-tree 2>/dev/null)
            if [ "$git_repo_dir" ]
              cd $git_repo_dir
            else
              return 1
            end
          '';
        };
        "gwc" = {
          description = "change directory to common repository";
          body = ''
            set repo_dir (git rev-parse --show-superproject-working-tree)
            if ! [ "$repo_dir" ]
                set repo_dir (git rev-parse --show-toplevel)
            end
            set common_git_dir (git -C $repo_dir rev-parse --path-format=absolute --git-common-dir)
            set common_dir (dirname $common_git_dir)
            if [ -d "$common_dir" ]
                if [ "$argv[1]" ]
                     cd $common_dir/(realpath --relative-to=(git rev-parse --show-toplevel) $argv[1])
                else
                    cd $common_dir
                end
            else
              return 1
            end
          '';
        };
      };
    };
  };
}