feat: default to python-lsp-server (pylsp) instead of pyls

lib/main.js

@@ -1,4 +1,5 @@
 const { shell } = require("electron")
+const execFileSync = require("child_process").execFileSync
 const { AutoLanguageClient } = require("atom-languageclient")
 const { detectVirtualEnv, detectPipEnv, replacePipEnvPathVar, sanitizeConfig } = require("./utils")
 
@@ -49,7 +50,15 @@ class PythonLanguageClient extends AutoLanguageClient {
       pylsEnvironment["VIRTUAL_ENV"] = venvPath
     }
     const python = replacePipEnvPathVar(atom.config.get("ide-python.python"), venvPath)
-    const pyls = atom.config.get("ide-python.pyls") || "pyls"
+
+    let pyls = atom.config.get("ide-python.pyls") || "pylsp"
+    // check if it exists
+    try {
+      execFileSync(pyls, ["--help"], { stdio: "inherit" })
+    } catch (e) {
+      console.error(e)
+      pyls = "pyls"
+    }
     const childProcess = super.spawn(python, ["-m", pyls], {
       cwd: projectPath,
       env: pylsEnvironment,
@@ -83,7 +92,7 @@ class PythonLanguageClient extends AutoLanguageClient {
           },
         ],
         description:
-          "Make sure to install `pyls` 0.19 or newer by running:\n" +
+          "Make sure to install `pylsp` 0.19 or newer by running:\n" +
           "```\n" +
           `${python} -m pip install 'python-lsp-server[all]'\n` +
           `${python} -m pip install git+https://github.com/tomv564/pyls-mypy.git\n` +

package.json

@@ -93,6 +93,12 @@
       "default": "python",
       "description": "Absolute path of your Python binary. This is used to launch the Python language server. Make sure to install `pyls` for this version of Python. Changes will take effect after a restart of the language server. Use `$PIPENV_PATH/bin/python` if you want to use the pipenv path of your project"
     },
+    "pyls-path": {
+      "title": "Path to pyls executable",
+      "order": 2,
+      "type": "string",
+      "default": "pylsp"
+    },
     "pylsConfigurationSources": {
       "order": 2,
       "type": "array",