pyls_ms: Microsoft Python Language Server #57

3 files changed, 160 insertions, 0 deletions

diff --git a/README.md b/README.md
index b690f019..8c3ad0f5 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,7 @@ Implemented language servers:
 - [hie](#hie)
 - [leanls](#leanls)
 - [pyls](#pyls)
+- [pyls_ms](#pyls_ms)
 - [rls](#rls)
 - [rust_analyzer](#rust_analyzer)
 - [solargraph](#solargraph)
@@ -1436,6 +1437,38 @@ nvim_lsp#setup("pyls", {config})
     settings = {}
 ```
 
+## pyls_ms
+
+https://github.com/Microsoft/python-language-server
+
+`Microsoft Language Server for Python `, a language server for Python.
+    
+Requires [.NET Core](https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-install-script) to run. On Linux or macOS:
+
+```bash
+curl -L https://dot.net/v1/dotnet-install.sh | sh
+```
+
+This server accepts configuration via the `settings` key.
+
+```lua
+nvim_lsp.pyls_ms.setup({config})
+
+  Default Values:
+    cmd = { "dotnet exec /path/to/Microsoft.Python.LanguageServer.dll" }
+    filetypes = { "python" }
+    log_level = lsp.protocol.MessageType.Warning
+    root_dir = util.find_git_ancestor(fname) or vim.loop.os_homedir()
+    settings = {
+      python = {
+        analysis = {
+          errors = {};
+          info = {};
+          disabled = {};
+      };
+    }
+```
+
 ## rls
 
 https://github.com/rust-lang/rls
diff --git a/lua/nvim_lsp.lua b/lua/nvim_lsp.lua
index 82c303f7..2c5a3271 100644
--- a/lua/nvim_lsp.lua
+++ b/lua/nvim_lsp.lua
@@ -11,6 +11,7 @@ require 'nvim_lsp/gopls'
 require 'nvim_lsp/hie'
 require 'nvim_lsp/leanls'
 require 'nvim_lsp/pyls'
+require 'nvim_lsp/pyls_ms'
 require 'nvim_lsp/rls'
 require 'nvim_lsp/rust_analyzer'
 require 'nvim_lsp/solargraph'
diff --git a/lua/nvim_lsp/pyls_ms.lua b/lua/nvim_lsp/pyls_ms.lua
new file mode 100644
index 00000000..eb352b11
--- /dev/null
+++ b/lua/nvim_lsp/pyls_ms.lua
@@ -0,0 +1,126 @@
+local skeleton = require 'nvim_lsp/skeleton'
+local util = require 'nvim_lsp/util'
+local lsp = vim.lsp
+
+local name = "pyls_ms"
+
+local function get_python_version()
+  local f = io.popen("python --version 2>&1") -- runs command
+  local l = f:read("*a") -- read output of command
+  f:close()
+  return l:match("^Python%s*(...).*%s*$")
+end
+
+local function make_installer()
+  local P = util.path.join
+  local install_dir = P{util.base_install_dir, name}
+
+  local bin = P{install_dir, "Microsoft.Python.LanguageServer.dll"}
+  local cmd = {"dotnet", "exec", bin}
+
+  local X = {}
+  function X.install()
+    local install_info = X.info()
+    if install_info.is_installed then
+      print(name, "is already installed")
+      return
+    end
+    if not (util.has_bins("curl")) then
+      error('Need "curl" to install this.')
+      return
+    end
+    if not (util.has_bins("dotnet")) then
+      error('Need ".NET Core" to install this.')
+      return
+    end
+
+    local system
+    if vim.fn.has('mac') then
+      system = 'osx'
+    elseif vim.fn.has('unix') then
+      system = 'linux'
+    elseif vim.fn.has('win32') then
+      system = 'win'
+    else 
+      error('Unable to identify host operating system')
+    end
+
+    local url = string.format("https://pvsc.azureedge.net/python-language-server-stable/Python-Language-Server-%s-x64.0.4.114.nupkg", string.lower(system))
+    download_cmd = string.format('curl -fLo %s --create-dirs %s', install_info.install_dir .. "/pyls.nupkg", url)
+
+    if vim.fn.has('mac') or vim.fn.has('unix') then
+      install_cmd = "unzip " .. install_info.install_dir .. "/pyls.nupkg -d " .. install_info.install_dir
+    elseif vim.fn.has('win32') then
+      install_cmd = "Expand-Archive -Force " .. install_info.install_dir .. "/pyls.nupkg -d " .. install_info.install_dir
+    end
+
+    vim.fn.system(download_cmd)
+    vim.fn.system(install_cmd)
+  end
+  function X.info()
+    return {
+      is_installed = util.path.exists(bin);
+      install_dir = install_dir;
+      cmd = cmd;
+    }
+  end
+  function X.configure(config)
+    local install_info = X.info()
+    if install_info.is_installed then
+      config.cmd = cmd
+    end
+  end
+  return X
+end
+
+local installer = make_installer()
+
+skeleton[name] = {
+
+  default_config = {
+    filetypes = {"python"};
+    root_dir = function(fname)
+      return util.find_git_ancestor(fname) or vim.loop.os_homedir()
+    end;
+    log_level = lsp.protocol.MessageType.Warning;
+    settings = {
+      python = {
+        analysis = {
+          errors = {};
+          info = {};
+          disabled = {};
+        };
+      };
+    };
+    on_new_config = function(config)
+      installer.configure(config)
+    end;
+    init_options = {
+      interpreter = 
+                {
+                    properties= 
+                    {
+                        InterpreterPath=vim.fn.exepath("python");
+                        Version=get_python_version();
+                    };
+                };
+      displayOptions= {};
+      analysisUpdates=true;
+      asyncStartup=true;
+    };
+  };
+  -- on_new_config = function(new_config) end;
+  -- on_attach = function(client, bufnr) end;
+  docs = {
+    description = [[
+    https://github.com/Microsoft/python-language-server
+    `python-language-server`, a language server for Python.
+    ]];
+    default_config = {
+      root_dir = "vim's starting directory";
+    };
+  };
+};
+
+skeleton[name].install = installer.install
+skeleton[name].install_info = installer.info