Coalton LSP server

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+    branches: [master]
+
+jobs:
+  test:
+    name: ${{matrix.lisp}} on ${{matrix.os}}
+    strategy:
+      matrix:
+        lisp: [sbcl-bin]        # only one cool lisp
+        os: [ubuntu-latest]
+      fail-fast: false
+    runs-on: ${{matrix.os}}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Roswell
+        shell: bash
+        env:
+          LISP: ${{matrix.lisp}}
+        run: curl -L https://raw.githubusercontent.com/roswell/roswell/master/scripts/install-for-ci.sh | sh -x
+
+      - name: Get Lisp info
+        continue-on-error: true
+        shell: bash
+        run: |
+          ros -e '(format t "Lisp: ~a ~a on ~a~%" (lisp-implementation-type) (lisp-implementation-version) (machine-type))'
+          ros -e '(ql:quickload "trivial-features" :silent t)' -e '(format t "Features: ~s~%" *features*)'
+
+      - name: Run tests
+        shell: bash
+        run: |
+          ros -e '(setf *debugger-hook* (lambda (&rest ignorable) (declare (ignore ignorable)) (uiop:quit -1)))' -e '(ql:quickload "coalton-lsp/tests")' -e '(unless (fiasco:all-tests) (uiop:quit -1))'

.gitignore

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+*~
+*#
+*.fasl
+.clj-kondo
+.lsp

Makefile

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+# Run unit tests, failing on the first error.
+
+.PHONY: test
+test:
+	sbcl --noinform --non-interactive \
+             --eval "(asdf:load-system :coalton-lsp/tests)" \
+	     --eval "(fiasco:run-package-tests \
+                       :packages '(:coalton-lsp/tests) \
+                       :interactive nil)"

README.md

@@ -1,31 +1,51 @@
-This directory contains the source code for an Emacs mode that supports
-working with Coalton code.
+This is an Emacs mode that supports working with Coalton. Most of the
+logic is implemented as an LSP server.
 
 ## Requirements
 
-This mode requires Emacs version > 29.1 because it relies on
-tree-sitter. You can check that your copy of Emacs was built with
-support for tree sitter by evaluating:
+This mode has been developed using `eglot`, which is included with
+Emacs since version 29. The mode can be installed with
+`M-x package-install RET eglot RET` in Emacs 26.3 and later.
 
-    (treesit-available-p)
+In addition to Coalton, the LSP server process depends on the
+following Lisp libraries:
 
-## Installation
+- alexandria
+- bordeaux-threads
+- com.inuoe.jzon
+- usocket
 
-In your emacs init file (probably `~/.emacs.d/init.el` or `~/.emacs`), 
-add this directory to your load-path, and require the mode:
+## Current Status
+
+Supported LSP features:
+
+- diagnostics: whenever a .coal file is saved, the contents are
+  compiled, and diagnostics are published to the client.
+
+## Usage
+
+In the Emacs init file (e.g. `~/.emacs.d/init.el`), add this
+directory to the load-path, and require the mode:
 
     ;; Coalton
 
     (add-to-list 'load-path "~/git/coalton-mode")
     (require 'coalton-mode)
 
-## Usage
+Start the server in slime with:
 
-There is an example file, `types.coal` in the `test/` directory.
+    SLIME 2.30.git
+    CL-USER> (asdf:load-system "coalton-lsp")
+    ;; COALTON starting in development mode
+    ;; COALTON starting with specializations enabled
+    ;; COALTON starting with heuristic inlining disabled
+    ;; COALTON will emit type annotations
+    T
+    CL-USER> (coalton-lsp::start-server)
+    ;; :INFO coalton-mode: start #<SERVER 127.0.0.1:7887 {700D0A4333}>
+    #<COALTON-MODE::SERVER 127.0.0.1:7887 {700D0A4333}>
 
-The first time you open a `.coal` file, Emacs will ask you to approve
-the installation of a parser component:
+In Emacs, open a .coal file (e.g. resources/fibonacci.coal), and
+enable eglot mode:
 
-    tree-sitter-coalton is not installed. Clone, build and install it?
-
-(Answer 'yes')
+    M-x eglot

coalton-lsp

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+#!/usr/bin/env sh
+#
+# Run a Coalton server
+#
+# Usage:
+#
+#     coalton-lsp [ port ]
+#
+#         (port defaults to 7887)
+
+port=${1:-7887}
+
+sbcl \
+    --noinform \
+    --load coalton-lsp.asd \
+    --eval "(asdf:load-system \"coalton-lsp\")" \
+    --eval "(coalton-lsp:main :port ${port})"

coalton-lsp.asd

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+(in-package :asdf-user)
+
+(defsystem #:coalton-lsp
+  :depends-on (#:alexandria
+               #:bordeaux-threads
+               #:coalton
+               #:com.inuoe.jzon
+               #:usocket)
+  :pathname "src/"
+  :serial t
+  :components ((:file "package")
+               ;; 'lib' contains general purpose code
+               (:module "lib"
+                :serial t
+                :components ((:file "log")
+                             (:file "list")
+                             (:file "name")
+                             (:file "rpc")
+                             (:file "process")
+                             (:file "message")
+                             (:file "json")
+                             (:file "uri")))
+               (:file "session")
+               (:file "protocol")
+               (:file "server")))
+
+(defsystem #:coalton-lsp/tests
+  :depends-on (#:coalton-lsp
+               #:fiasco)
+  :pathname "tests/"
+  :serial t
+  :components ((:file "package")
+               (:file "mock")
+               (:file "json-tests")
+               (:file "lsp-tests")
+               (:file "message-tests")
+               (:file "protocol-tests")
+               (:file "rpc-tests")
+               (:file "session-tests")))