{ pkgs, lib, config, ... }:
{
  programs.fish = {
    enable = true;

    shellAbbrs = rec {
      ccat = "egrep -v '^\s*(#|\\$)'";
      g = "git";
      ga = "git add";
      gc = "git commit";      # interactive commit
      gcm = "git commit -m";  # quick commit
      gg = "git graph";
      gs = "git status";
      jqless = "jq -C | less -r";
      n = "nix";
      sshpass = "ssh -o PubkeyAuthentication=no";
      tf = "terraform";
      tfyolo = "terraform apply -auto-approve";
      v = "vim";
      vi = "vim";
    };

    shellAliases = {
      htop = "btm";   # because I always forget the name
    };

    functions = {
      # Disable greeting
      fish_greeting = "";
      fish_prompt = ''
        set -l last_pipestatus $pipestatus
        set -lx __fish_last_status $status # Export for __fish_print_pipestatus.
        set -l normal (set_color normal)
        set -q fish_color_status
        or set -g fish_color_status red

        # Detect if we're in a nix-shell
        set -l nix_shell_info (
          if test -n "$IN_NIX_SHELL"
            echo -n "[nix-shell] "
          end
        )

        # Color the prompt differently when we're root
        set -l color_cwd $fish_color_cwd
        set -l suffix '>'
        if functions -q fish_is_root_user; and fish_is_root_user
          if set -q fish_color_cwd_root
            set color_cwd $fish_color_cwd_root
          end
          set suffix '#'
        end

        # Write pipestatus
        # If the status was carried over (if no command is issued or if `set` leaves the status untouched), don't bold it.
        set -l bold_flag --bold
        set -q __fish_prompt_status_generation; or set -g __fish_prompt_status_generation $status_generation
        if test $__fish_prompt_status_generation = $status_generation
          set bold_flag
        end
        set __fish_prompt_status_generation $status_generation
        set -l status_color (set_color $fish_color_status)
        set -l statusb_color (set_color $bold_flag $fish_color_status)
        set -l prompt_status (__fish_print_pipestatus "[" "]" "|" "$status_color" "$statusb_color" $last_pipestatus)

        echo -n -s (prompt_login)' ' (set_color $color_cwd) (prompt_pwd) $normal (fish_vcs_prompt) $normal " "$nix_shell_info $prompt_status $suffix " "
      '';
      ssh = "TERM=xterm command ssh $argv";
      # Rebuild home-manager
      switch-home = "home-manager switch -b backup --flake ${config.home.homeDirectory}/.dotfiles#$USER@$(hostname -s)";
      switch-nix = "sudo nixos-rebuild switch --flake ${config.home.homeDirectory}/.dotfiles";
    };

    interactiveShellInit =
      # Launch tmux
      ''
        if not set -q TMUX
          tmux attach-session -t $(hostname -s) || tmux new-session -s $(hostname -s)
        end
      '' +
      # Open command buffer in vim when alt+e is pressed
      ''
        bind \ee edit_command_buffer
      '' +
      # Use vim bindings and cursors
      ''
        fish_vi_key_bindings
        set fish_cursor_default       block
        set fish_cursor_insert        block       blink
        set fish_cursor_replace_one   underscore  blink
        set fish_cursor_visual        block
      '' +
      # Restore ctrl+f to accept suggestions
      ''
        bind -M insert \cf forward-char
        bind -M default \cf forward-char
        bind -M visual \cf forward-char
      '' +
      # Use terminal colors
      ''
        set -U fish_color_autosuggestion      brblack
        set -U fish_color_cancel              -r
        set -U fish_color_command             brgreen
        set -U fish_color_comment             brmagenta
        set -U fish_color_cwd                 green
        set -U fish_color_cwd_root            red
        set -U fish_color_end                 brmagenta
        set -U fish_color_error               brred
        set -U fish_color_escape              brcyan
        set -U fish_color_history_current     --bold
        set -U fish_color_host                normal
        set -U fish_color_match               --background=brblue
        set -U fish_color_normal              normal
        set -U fish_color_operator            cyan
        set -U fish_color_param               brblue
        set -U fish_color_quote               yellow
        set -U fish_color_redirection         bryellow
        set -U fish_color_search_match        'bryellow' '--background=brblack'
        set -U fish_color_selection           'white' '--bold' '--background=brblack'
        set -U fish_color_status              red
        set -U fish_color_user                brgreen
        set -U fish_color_valid_path          --underline
        set -U fish_pager_color_completion    normal
        set -U fish_pager_color_description   yellow
        set -U fish_pager_color_prefix        'white' '--bold' '--underline'
        set -U fish_pager_color_progress      'brwhite' '--background=cyan'
      '';
  };
}