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266 lines
10 KiB
266 lines
10 KiB
;;; inf-haskell.el --- Interaction with an inferior Haskell process -*- lexical-binding: t -*-
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;; Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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;; Copyright (C) 2017 Vasantha Ganesh Kanniappan <vasanthaganesh.k@tuta.io>
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;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
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;; Keywords: Haskell
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;; This file is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3, or (at your option)
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;; any later version.
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;; This file is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; A major mode for the buffer that holds the inferior process
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;; Todo:
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;; - Check out Shim for ideas.
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;; - i-h-load-buffer and i-h-send-region.
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;;; Code:
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(require 'comint)
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(require 'shell) ; For directory tracking.
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(require 'etags)
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(require 'haskell-compat)
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(require 'compile)
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(require 'haskell-decl-scan)
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(require 'haskell-cabal)
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(require 'haskell-customize)
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(require 'cl-lib)
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(require 'haskell-string)
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;;;###autoload
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(defgroup inferior-haskell nil
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"Settings for REPL interaction via `inferior-haskell-mode'"
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:link '(custom-manual "(haskell-mode)inferior-haskell-mode")
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:prefix "inferior-haskell-"
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:prefix "haskell-"
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:group 'haskell)
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(defcustom inferior-haskell-hook nil
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"The hook that is called after starting inf-haskell."
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:type 'hook)
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(defun haskell-program-name-with-args ()
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"Return the command with the arguments to start the repl based on the
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directory structure."
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(cl-ecase (haskell-process-type)
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('ghci (cond ((eq system-type 'cygwin) (nconc "ghcii.sh"
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haskell-process-args-ghci))
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(t (append
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(if (listp haskell-process-path-ghci)
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haskell-process-path-ghci
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(list haskell-process-path-ghci))
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haskell-process-args-ghci))))
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('cabal-repl (nconc `(,haskell-process-path-cabal
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"repl")
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haskell-process-args-cabal-repl))
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('stack-ghci (nconc `(,haskell-process-path-stack
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"ghci")
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haskell-process-args-stack-ghci))))
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(defconst inferior-haskell-info-xref-re
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"-- Defined at \\(.+\\):\\([0-9]+\\):\\([0-9]+\\)\\(?:-\\([0-9]+\\)\\)?$")
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(defconst inferior-haskell-module-re
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"-- Defined in \\(.+\\)$"
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"Regular expression for matching module names in :info.")
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(defvar inferior-haskell-multiline-prompt-re
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"^\\*?[[:upper:]][\\._[:alnum:]]*\\(?: \\*?[[:upper:]][\\._[:alnum:]]*\\)*| "
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"Regular expression for matching multiline prompt (the one inside :{ ... :} blocks).")
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(defconst inferior-haskell-error-regexp-alist
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`(;; Format of error messages used by GHCi.
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("^\\(.+?\\):\\([0-9]+\\):\\(\\([0-9]+\\):\\)?\\( \\|\n *\\)\\([Ww]arning\\)?"
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1 2 4 ,@(if (fboundp 'compilation-fake-loc)
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'((6) nil (5 '(face nil font-lock-multiline t)))))
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;; Runtime exceptions, from ghci.
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("^\\*\\*\\* Exception: \\(.+?\\):(\\([0-9]+\\),\\([0-9]+\\))-(\\([0-9]+\\),\\([0-9]+\\)): .*"
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1 ,@(if (fboundp 'compilation-fake-loc) '((2 . 4) (3 . 5)) '(2 3)))
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;; GHCi uses two different forms for line/col ranges, depending on
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;; whether it's all on the same line or not :-( In Emacs-23, I could use
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;; explicitly numbered subgroups to merge the two patterns.
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("^\\*\\*\\* Exception: \\(.+?\\):\\([0-9]+\\):\\([0-9]+\\)-\\([0-9]+\\): .*"
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1 2 ,(if (fboundp 'compilation-fake-loc) '(3 . 4) 3))
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;; Info messages. Not errors per se.
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,@(when (fboundp 'compilation-fake-loc)
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`(;; Other GHCi patterns used in type errors.
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("^[ \t]+at \\(.+\\):\\([0-9]+\\):\\([0-9]+\\)-\\([0-9]+\\)$"
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1 2 (3 . 4) 0)
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;; Foo.hs:318:80:
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;; Ambiguous occurrence `Bar'
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;; It could refer to either `Bar', defined at Zork.hs:311:5
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;; or `Bar', imported from Bars at Frob.hs:32:0-16
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;; (defined at Location.hs:97:5)
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("[ (]defined at \\(.+\\):\\([0-9]+\\):\\([0-9]+\\))?$" 1 2 3 0)
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("imported from .* at \\(.+\\):\\([0-9]+\\):\\([0-9]+\\)-\\([0-9]+\\)$"
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1 2 (3 . 4) 0)
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;; Info xrefs.
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(,inferior-haskell-info-xref-re 1 2 (3 . 4) 0))))
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"Regexps for error messages generated by inferior Haskell processes.
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The format should be the same as for `compilation-error-regexp-alist'.")
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(defconst haskell-prompt-regexp
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;; Why the backslash in [\\._[:alnum:]]?
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"^\\*?[[:upper:]][\\._[:alnum:]]*\\(?: \\*?[[:upper:]][\\._[:alnum:]]*\\)*\\( λ\\)?> \\|^λ?> $")
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;;; TODO
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;;; -> Make font lock work for strings, directories, hyperlinks
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;;; -> Make font lock work for key words???
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(defvaralias 'inferior-haskell-mode-map 'inf-haskell-map)
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(defvar inf-haskell-map
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(let ((map (make-sparse-keymap)))
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(define-key map "\C-c\C-d" 'comint-kill-subjob)
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map))
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(define-derived-mode inferior-haskell-mode comint-mode "Inf-Haskell"
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"Major mode for interacting with an inferior Haskell process."
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:group 'inferior-haskell
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(setq-local comint-prompt-regexp haskell-prompt-regexp)
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(setq-local paragraph-start haskell-prompt-regexp)
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(setq-local comint-input-autoexpand nil)
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(setq-local comint-prompt-read-only t)
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;; Setup directory tracking.
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(setq-local shell-cd-regexp ":cd")
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(condition-case nil
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(shell-dirtrack-mode 1)
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(error ;The minor mode function may not exist or not accept an arg.
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(setq-local shell-dirtrackp t)
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(add-hook 'comint-input-filter-functions 'shell-directory-tracker
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nil 'local)))
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;; Setup `compile' support so you can just use C-x ` and friends.
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(setq-local compilation-error-regexp-alist inferior-haskell-error-regexp-alist)
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(setq-local compilation-first-column 0) ;GHCI counts from 0.
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(if (and (not (boundp 'minor-mode-overriding-map-alist))
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(fboundp 'compilation-shell-minor-mode))
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;; If we can't remove compilation-minor-mode bindings, at least try to
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;; use compilation-shell-minor-mode, so there are fewer
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;; annoying bindings.
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(compilation-shell-minor-mode 1)
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;; Else just use compilation-minor-mode but without its bindings because
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;; things like mouse-2 are simply too annoying.
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(compilation-minor-mode 1)
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(let ((map (make-sparse-keymap)))
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(dolist (keys '([menu-bar] [follow-link]))
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;; Preserve some of the bindings.
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(define-key map keys (lookup-key compilation-minor-mode-map keys)))
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(add-to-list 'minor-mode-overriding-map-alist
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(cons 'compilation-minor-mode map))))
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(add-hook 'inferior-haskell-hook 'inferior-haskell-init))
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(defvar inferior-haskell-buffer nil
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"The buffer in which the inferior process is running.")
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(defun inferior-haskell-start-process ()
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"Start an inferior haskell process.
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With universal prefix \\[universal-argument], prompts for a COMMAND,
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otherwise uses `haskell-program-name-with-args'.
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It runs the hook `inferior-haskell-hook' after starting the process and
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setting up the inferior-haskell buffer."
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(let ((command (haskell-program-name-with-args)))
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(when inferior-haskell-root-dir
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(setq default-directory inferior-haskell-root-dir))
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(setq inferior-haskell-buffer
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(apply 'make-comint "haskell" (car command) nil (cdr command)))
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(with-current-buffer inferior-haskell-buffer
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(inferior-haskell-mode)
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(run-hooks 'inferior-haskell-hook))))
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(defun inferior-haskell-process ()
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"Restart if not present."
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(cond ((and (buffer-live-p inferior-haskell-buffer)
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(comint-check-proc inferior-haskell-buffer))
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(get-buffer-process inferior-haskell-buffer))
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(t (inferior-haskell-start-process)
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(inferior-haskell-process))))
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;;;###autoload
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(defalias 'run-haskell 'switch-to-haskell)
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;;;###autoload
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(defun switch-to-haskell ()
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"Show the inferior-haskell buffer. Start the process if needed."
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(interactive)
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(let ((proc (inferior-haskell-process)))
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(pop-to-buffer-same-window (process-buffer proc))))
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(defvar inferior-haskell-result-history nil)
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(defvar haskell-next-input ""
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"This is a temporary variable to store the intermediate results while
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`accecpt-process-output' with `haskell-extract-exp'")
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(defun haskell-extract-exp (str)
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(setq haskell-next-input (concat haskell-next-input str))
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(if (with-temp-buffer
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(insert haskell-next-input)
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(re-search-backward haskell-prompt-regexp nil t 1))
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(progn
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(push (substring haskell-next-input
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0
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(1- (with-temp-buffer
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(insert haskell-next-input)
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(re-search-backward haskell-prompt-regexp nil t 1))))
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inferior-haskell-result-history)
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(setq haskell-next-input ""))
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""))
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(defun inferior-haskell-no-result-return (strg)
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(let ((proc (inferior-haskell-process)))
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(with-local-quit
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(progn
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(add-to-list 'comint-preoutput-filter-functions
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(lambda (output)
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(haskell-extract-exp output)))
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(process-send-string proc strg)
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(accept-process-output proc)
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(sit-for 0.1)
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(setq comint-preoutput-filter-functions nil)))))
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(defun inferior-haskell-get-result (inf-expr)
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"Submit the expression `inf-expr' to ghci and read the result."
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(let* ((times 5))
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(inferior-haskell-no-result-return (concat inf-expr "\n"))
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(while (and (> times 0)
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(not (stringp (car inferior-haskell-result-history))))
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(setq times (1- times))
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(inferior-haskell-no-result-return (concat inf-expr "\n")))
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(haskell-string-chomp (car inferior-haskell-result-history))))
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(defun inferior-haskell-init ()
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"The first thing run while initalizing inferior-haskell-buffer"
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(with-local-quit
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(with-current-buffer inferior-haskell-buffer
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(process-send-string (inferior-haskell-process) "\n")
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(accept-process-output (inferior-haskell-process))
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(sit-for 0.1))))
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(defvar haskell-set+c-p nil
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"t if `:set +c` else nil")
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(defun haskell-set+c ()
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"set `:set +c` is not already set"
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(if (not haskell-set+c-p)
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(inferior-haskell-get-result ":set +c")))
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(provide 'inf-haskell)
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;;; inf-haskell.el ends here
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