nixos-config/modules/home/helix.nix

{
  pkgs,
  ...
}:
let
  yazi-picker = pkgs.writeShellApplication {
    name = "yazi-picker";
    text = ''
      paths=$(yazi --chooser-file=/dev/stdout)

      if [[ -n "$paths" ]]; then
        zellij action toggle-floating-panes
      	zellij action write 27 # send <Escape> key
      	zellij action write-chars ":$1 $paths"
      	zellij action write 13 # send <Enter> key
      else
      	zellij action toggle-floating-panes
      fi
    '';
  };
in
{
  home.packages = [ yazi-picker ];

  programs.helix = {
    enable = true;
    defaultEditor = true;
    extraPackages = with pkgs; [
      basedpyright # Python static type checker
      ruff # Pyhton linter and formatter
      nixd # Nix language server
      nixfmt # Nix formatter
      rust-analyzer # Rust language server
      rustfmt # Rust formmater
      clippy # Rust linter
      lldb # Debugger for llvm languages
      marksman # Markdown language server
      markdown-oxide # Markdown PKM language server
      rumdl # Markdown linter and formatter
      libclang # C language family frontend for LLVM
      typescript-language-server # Typescript language server
      vscode-langservers-extracted # HTML/CSS/JSON/ESLint language servers extracted from vscode
      emmet-language-server # Emmet support based on LSP
      prettier # Formatter for HTML/CSS/JSON/ESLint languages
      superhtml # HTML Language Server and Templating Language Library
    ];
    settings = {
      editor = {
        line-number = "relative";
        cursorline = true;
        auto-format = true;
        completion-timeout = 5;
        completion-trigger-len = 1;
        bufferline = "always";
        color-modes = true;
        end-of-line-diagnostics = "hint";
        lsp = {
          display-inlay-hints = true;
        };
        cursor-shape = {
          insert = "bar";
          normal = "block";
          select = "underline";
        };
        indent-guides = {
          render = true;
          skip-levels = 1;
        };
        soft-wrap = {
          enable = true;
          max-indent-retain = 80;
        };
        inline-diagnostics = {
          cursor-line = "warning";
        };
      };
      keys =
        let
          arrow_keys = {
            "up" = "jump_view_up";
            "down" = "jump_view_down";
            "left" = "jump_view_left";
            "right" = "jump_view_right";
          };
        in
        {
          normal = {
            "C-y" =
              ":sh zellij run -n Yazi -c -f -x 10%% -y 10%% --width 80%% --height 80%% -- yazi-picker open %{buffer_name}";
          }
          // arrow_keys;
          insert = {
            "C-k" = "move_visual_line_up";
            "C-j" = "move_visual_line_down";
            "C-h" = "move_char_left";
            "C-l" = "move_char_right";
          }
          // arrow_keys;
          select = { } // arrow_keys;
        };
      theme = "catppuccin_mocha";
    };
    # Check https://github.com/helix-editor/helix/blob/master/languages.toml for default language configuration
    # Only explictly set options you want to override / make explicit
    languages = {
      language = [
        {
          name = "python";
          language-servers = [
            "basedpyright"
            "ruff"
          ];
          auto-format = true;
          formatter = {
            command = "ruff";
            args = [
              "format"
              "-"
            ];
          };
        }
        {
          name = "nix";
          language-servers = [ "nixd" ];
          auto-format = true;
          formatter = {
            command = "nixfmt";
          };
        }
        {
          name = "rust";
          auto-format = true;
          formatter = {
            command = "rustfmt";
          };
        }
        {
          name = "markdown";
          auto-format = true;
          formatter = {
            command = "rumdl";
            args = [
              "fmt"
              "-"
            ];
          };
        }
        {
          name = "c";
          file-types = [
            "c"
            "h"
          ]; # "h" is currently missing from the default config
          auto-format = true;
          formatter = {
            command = "clang-format";
            args = [
              "--style=WebKit"
            ];
          };
        }
        {
          name = "typescript";
          language-servers = [
            "typescript-language-server"
            "vscode-eslint-language-server"
            "emmet-language-server"
          ];
          auto-format = true;
          formatter = {
            command = "prettier";
            args = [
              "--parser"
              "typescript"
            ];
          };
        }
        {
          name = "tsx";
          language-servers = [
            "typescript-language-server"
            "vscode-eslint-language-server"
            "emmet-language-server"
          ];
          auto-format = true;
          formatter = {
            command = "prettier";
            args = [
              "--parser"
              "typescript"
            ];
          };
        }
        {
          name = "javascript";
          language-servers = [
            "typescript-language-server"
            "vscode-eslint-language-server"
            "emmet-language-server"
          ];
          auto-format = true;
          formatter = {
            command = "prettier";
            args = [
              "--parser"
              "typescript"
            ];
          };
        }
        {
          name = "jsx";
          language-servers = [
            "typescript-language-server"
            "vscode-eslint-language-server"
            "emmet-language-server"
          ];
          auto-format = true;
          formatter = {
            command = "prettier";
            args = [
              "--parser"
              "typescript"
            ];
          };
        }
        {
          name = "json";
          auto-format = true;
          formatter = {
            command = "prettier";
            args = [
              "--parser"
              "json"
            ];
          };
        }
        {
          name = "jsonc";
          auto-format = true;
          formatter = {
            command = "prettier";
            args = [
              "--parser"
              "jsonc"
            ];
          };
        }
        {
          name = "html";
          language-servers = [
            "vscode-html-language-server"
            {
              name = "superhtml";
              except-features = [ "format" ];
            }
            "emmet-language-server"
          ];
          auto-format = true;
          formatter = {
            command = "prettier";
            args = [
              "--parser"
              "html"
            ];
          };
        }
        {
          name = "css";
          language-servers = [
            "vscode-css-language-server"
            "emmet-language-server"
          ];
          auto-format = true;
          formatter = {
            command = "prettier";
            args = [
              "--parser"
              "css"
            ];
          };
        }
        {
          name = "scss";
          language-servers = [
            "vscode-css-language-server"
            "emmet-language-server"
          ];
          auto-format = true;
          formatter = {
            command = "prettier";
            args = [
              "--parser"
              "scss"
            ];
          };
        }
      ];
      language-server = {
        basedpyright.config.python.analysis.typeCheckingMode = "strict";
        rust-analyzer.config.check.command = "clippy";
        emmet-language-server = {
          command = "emmet-language-server";
          args = [ "--stdio" ];
        };
        vscode-eslint-language-server = {
          config = {
            # Automatically fix ESLint errors
            codeActionsOnSave = {
              mode = "all";
              "source.fixAll.eslint" = true;
            };
            quiet = false;
            experimental = {
              # Support for the modern ESLint configuration format
              useFlatConfig = true;
            };
          };
        };
      };
    };
  };
}