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   "source": [
    "## Language Servers\n",
    "\n",
    "`jupyter-lsp` does not come with any Language Servers! However, we will try to\n",
    "use them if they _are_ installed and we know about them. For the language\n",
    "servers in the tables below, use one of the suggested package managers to\n",
    "install them: these implementations are tested to work with `jupyter-lsp`.\n",
    "\n",
    "- _You can disable this feature by configuring_\n",
    "  [autodetect](./Configuring.ipynb#autodetect)\n",
    "\n",
    "If you do not see a language you would like, but can find it one of these lists:\n",
    "\n",
    "- the [official list][lsp-implementations] of language servers\n",
    "- a [community-curated list][langserver] of language servers\n",
    "\n",
    "...you might be able to add it\n",
    "[via configuration](./Configuring.ipynb#language_servers) or\n",
    "[build your own spec](./Contributing.ipynb#Specs) for the server in question.\n",
    "\n",
    "[language-server]:\n",
    "  https://microsoft.github.io/language-server-protocol/specification\n",
    "[langserver]: https://langserver.org\n",
    "[lsp-implementations]:\n",
    "  https://microsoft.github.io/language-server-protocol/implementors/servers"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "import pathlib\n",
    "\n",
    "import IPython\n",
    "from jinja2 import Template\n",
    "from jupyter_lsp import LanguageServerManager"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "hide_input": true
   },
   "outputs": [],
   "source": [
    "mgr = LanguageServerManager(extra_node_roots=[str(pathlib.Path.cwd().parent)])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
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   },
   "outputs": [],
   "source": [
    "mgr.init_language_servers()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "def lang_server_table(specs):\n",
    "    return IPython.display.HTML(\n",
    "        Template(\n",
    "            \"\"\"\n",
    "        <table class=\"langservers\">\n",
    "            <thead>\n",
    "                <tr>\n",
    "                    <th>Languages</th>\n",
    "                    <th>Implementation</th>\n",
    "                    <th>Installation</th>\n",
    "                </tr>\n",
    "            </thead>\n",
    "            <tbody>\n",
    "                {% for key, spec in specs.items() %}\n",
    "                <tr>\n",
    "                    <th>\n",
    "                        {% for lang in spec.languages %}\n",
    "                            <a name=\"language-{{lang}}\"/>{{ lang }}<br/>\n",
    "                        {% endfor %}\n",
    "                    </th>\n",
    "                    <td>\n",
    "                        <a href=\"{{spec.urls.home}}\">{{key}}</a>\n",
    "                    </td>\n",
    "                    <td>\n",
    "                        <ul>\n",
    "                        {% for pkgmgr, inst in spec.install.items() %}\n",
    "                        <li>{{pkgmgr}}: <code>{{ inst }}</code></li>\n",
    "                        {% endfor %}\n",
    "                        </ul>\n",
    "                    </td>\n",
    "                </tr>\n",
    "                {% endfor %}\n",
    "            </tbody>\n",
    "        </table>\n",
    "        \"\"\"\n",
    "        ).render(specs=specs)\n",
    "    )"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Notebook-Optimized Language Servers\n",
    "\n",
    "These servers have well-tested support for notebooks and file editors."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "hide_input": true
   },
   "outputs": [],
   "source": [
    "nb_langs = [\"pyls\", \"r-languageserver\"]\n",
    "lang_server_table(\n",
    "    {key: spec for key, spec in mgr.language_servers.items() if key in nb_langs}\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### NodeJS-based Language Servers\n",
    "\n",
    "These servers have mostly been tested with file editors."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "hide_input": true
   },
   "outputs": [],
   "source": [
    "lang_server_table(\n",
    "    {\n",
    "        key: spec\n",
    "        for key, spec in mgr.language_servers.items()\n",
    "        if \"npm\" in spec[\"install\"]\n",
    "    }\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Example: Getting All the NodeJS-based Language Servers\n",
    "\n",
    "A number of language servers are built on the\n",
    "[reference implementation](https://github.com/microsoft/vscode-languageserver-node),\n",
    "powered by NodeJS. The most reliable place to install these is in a\n",
    "`node_modules` in the directory where you launch `jupyter lab`.\n",
    "\n",
    "For example, to install all the servers which are tested as part of\n",
    "`jupyterlab-lsp`:\n",
    "\n",
    "```bash\n",
    "jlpm add --dev \\\n",
    "    bash-language-server \\\n",
    "    vscode-css-languageserver-bin \\\n",
    "    dockerfile-language-server-nodejs \\\n",
    "    vscode-html-languageserver-bin \\\n",
    "    javascript-typescript-langserver \\\n",
    "    vscode-json-languageserver-bin \\\n",
    "    yaml-language-server\n",
    "```\n",
    "\n",
    "This will create create (or add to):\n",
    "\n",
    "- `package.json` (check this in!)\n",
    "- `yarn.lock` (check this in!)\n",
    "- `node_modules/` (add to your VCS ignore file)\n",
    "\n",
    "If you wish to install these someplace else, you may need to specify where you\n",
    "install them with [extra_node_roots](./Configuring.ipynb#extra_node_roots)."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Other Scientific Languages\n",
    "\n",
    "These servers have been mostly tested with file editor."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "hide_input": true
   },
   "outputs": [],
   "source": [
    "sci_langs = [\"texlab\"]\n",
    "lang_server_table(\n",
    "    {key: spec for key, spec in mgr.language_servers.items() if key in sci_langs}\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Example: Getting a $\\LaTeX$ stack\n",
    "\n",
    "```bash\n",
    "conda install -y conda-forge tectonic texlab chktex\n",
    "```\n",
    "\n",
    "This will install:\n",
    "\n",
    "- `tectonic`, a cross-platform $\\LaTeX$ processing tool\n",
    "  - note, it will download a large number of packages when first executed\n",
    "- `texlab`, a Language Server for `.tex` files that supports completion and\n",
    "  refernce navigation\n",
    "- `chktex`, a `.tex` style checker"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "hide_input": true
   },
   "outputs": [],
   "source": [
    "%%html\n",
    "<style>\n",
    "    table.langservers thead th {\n",
    "        text-align: center !important;\n",
    "    }\n",
    "\n",
    "    table.langservers tbody td,\n",
    "    table.langservers tbody th {\n",
    "        text-align: left !important;\n",
    "    }\n",
    "</style>"
   ]
  }
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