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;;; urweb-flycheck.el --- Flycheck: Ur/Web support -*- lexical-binding: t; -*-
;; Copyright (C) 2018 Artyom Shalkhakov <artyom.shalkhakov@gmail.com>
;; Author:
;; Artyom Shalkhakov <artyom.shalkhakov@gmail.com>
;; David Christiansen <david@davidchristiansen.dk>
;;
;; Keywords: tools, languages, convenience
;; Version: 0.2
;; Package-Requires: ((emacs "24.1") (flycheck "0.22"))
;; This file is not part of GNU Emacs, but it is distributed under the
;; same conditions.
;; 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 2, 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 GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
;; This Flycheck extension provides an 'urweb' syntax checker.
;;
;; # Setup
;;
;; Put the following into your 'init' file:
;;
;; (with-eval-after-load 'flycheck (urweb-flycheck-setup))
;;
;; Ensure that the Ur/Web compiler is in your PATH
;;
;;; Code:
(require 'flycheck)
(defun urweb-get-flycheck-project-file ()
"Guess the location of the nearest urp file."
(let ((bn (buffer-file-name)))
(if bn
(let
((x (file-name-sans-extension bn))
(y (file-name-directory bn)))
(cond
;; file with .urp extension exists? take it
((file-exists-p (concat x ".urp")) x)
;; lib.urp exists in this directory? take it
((file-exists-p (concat y "/lib.urp")) (concat y "/lib"))
;; fall back to the first .urp file in this directory
;; or if that fails, use the current file name
(t (or (car (directory-files y nil "\\.urp$")) x)))))))
(flycheck-define-checker urweb
"Ur/Web checker"
:command ("urweb" "-tc"
(eval (urweb-get-flycheck-project-file)))
;; filename:1:0: (to 1:0) syntax error found at SYMBOL
;; filename:1:0: (to 1:38) Some constructor unification variables are undetermined in declaration
;; (look for them as "<UNIF:...>")
;; Decl:
;; val rec
;; help :
;; {} -> <UNIF:E::Type -> Type> (xml <UNIF:G::{Unit}> <UNIF:H::{Type}> ([])) =
;; fn $x : {} =>
;; case $x of
;; {} =>
;; return [<UNIF:E::Type -> Type>]
;; [xml <UNIF:G::{Unit}> <UNIF:H::{Type}> ([])] _
;; (Basis.cdata [<UNIF:G::{Unit}>] [<UNIF:H::{Type}>] "Hello!")
:error-patterns
((error line-start (file-name) ":" line ":" column ":"
" (to " (1+ num) ?: (1+ num) ")"
;; AS: indebted to David Christiansen for this rx expression!
(message (and (* nonl) (* "\n" (not (any "/" "~")) (* nonl))))))
:predicate
(lambda ()
(buffer-file-name))
:modes (urweb-mode))
;;;###autoload
(defun urweb-flycheck-setup ()
"Setup Flycheck Ur/Web.
Add `urweb' to `flycheck-checkers'."
(interactive)
(add-to-list 'flycheck-checkers 'urweb))
(provide 'urweb-flycheck)
;;; urweb-flycheck.el ends here
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