Add Standard ML (Millet) (#3914)

Author: azdavis

clients/lsp-sml.el

@@ -0,0 +1,91 @@
+;;; lsp-sml.el --- Standard ML client settings -*- lexical-binding: t; -*-
+
+;; Copyright (c) 2023 Ariel Davis
+
+;; Author: Ariel Davis <ariel.z.davis@icloud.com>
+;; Keywords: langauges, lsp, sml, standard-ml, millet
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; lsp-sml client via Millet
+
+;;; Code:
+
+(require 'lsp-mode)
+(require 'lsp-completion)
+
+(defgroup lsp-sml nil
+  "LSP support for Standard ML, using the Millet language server."
+  :link '(url-link "https://github.com/azdavis/millet")
+  :group 'lsp-mode)
+
+(defcustom lsp-sml-millet-format-engine "none"
+  "**WARNING: THE FORMATTER IS HIGHLY EXPERIMENTAL.
+IT MAY IRREVOCABLY DESTROY SOME OR ALL OF YOUR CODE.**
+
+How to format open SML files on save."
+  :type '(choice (const :tag "No formatting." "none")
+                 (const :tag "Naive formatting." "naive")
+                 (const :tag "Formatting provided by https://github.com/shwestrick/smlfmt." "smlfmt"))
+  :group 'lsp-sml)
+
+(defcustom lsp-sml-millet-server-diagnostics-filter "syntax"
+  "What diagnostics to send per file."
+  :type '(choice (const :tag "No filter, i.e. all available diagnostics are sent." "none")
+                 (const :tag "If there are syntax errors (lex, parse, etc),
+send only those, and do not send e.g. statics diagnostics." "syntax"))
+  :group 'lsp-sml)
+
+(defcustom lsp-sml-millet-server-diagnostics-moreInfoHint-enable t
+  "Show a hint on diagnostic messages about clicking the error code number for more information."
+  :type 'boolean
+  :group 'lsp-sml)
+
+(defcustom lsp-sml-millet-server-diagnostics-onChange-enable nil
+  "Send diagnostics when file contents change before saving."
+  :type 'boolean
+  :group 'lsp-sml)
+
+(defcustom lsp-sml-millet-server-hover-token-enable t
+  "Show information about tokens on hover."
+  :type 'boolean
+  :group 'lsp-sml)
+
+(defcustom lsp-sml-millet-server-path "millet-ls"
+  "Path to the `millet-ls` executable."
+  :type 'string
+  :group 'lsp-sml)
+
+(lsp-register-custom-settings
+ '(("millet.format.engine" lsp-sml-millet-format-engine)
+   ("millet.server.diagnostics.filter" lsp-sml-millet-server-diagnostics-filter)
+   ("millet.server.diagnostics.moreInfoHint.enable" lsp-sml-millet-server-diagnostics-moreInfoHint-enable)
+   ("millet.server.diagnostics.onChange.enable" lsp-sml-millet-server-diagnostics-onChange-enable)
+   ("millet.server.hover.token.enable" lsp-sml-millet-server-hover-token-enable)
+   ("millet.server.path" lsp-sml-millet-server-path)))
+
+(lsp-register-client
+ (make-lsp-client :new-connection (lsp-stdio-connection
+                                   (lambda () lsp-sml-millet-server-path))
+                  :activation-fn (lsp-activate-on "sml" "millet.toml")
+                  :language-id "sml"
+                  :priority -1
+                  :server-id 'millet))
+
+(lsp-consistency-check lsp-sml)
+
+(provide 'lsp-sml)
+;;; lsp-sml.el ends here

docs/lsp-clients.json

@@ -451,6 +451,14 @@
     "installation-url": "https://github.com/artempyanykh/marksman",
     "debugger": "Not available"
   },
+  {
+    "name": "millet",
+    "full-name": "Standard ML (Millet)",
+    "server-name": "millet",
+    "server-url": "https://github.com/azdavis/millet",
+    "installation-url": "https://github.com/azdavis/millet",
+    "debugger": "Not available"
+  },
   {
     "name": "mint",
     "full-name": "mint-lang",

mkdocs.yml

@@ -132,6 +132,7 @@ nav:
     - Rust (rls): page/lsp-rust-rls.md
     - Scala: https://emacs-lsp.github.io/lsp-metals
     - SQL (sqls): page/lsp-sqls.md
+    - Standard ML (Millet): page/lsp-sml.md
     - Svelte: page/lsp-svelte.md
     - Swift: https://emacs-lsp.github.io/lsp-sourcekit
     - Terraform (terraform-lsp): page/lsp-terraform.md