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125 lines
5.4 KiB
125 lines
5.4 KiB
;;; haskell-repl.el --- REPL evaluation -*- lexical-binding: t -*-
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;; Copyright (c) 2014 Chris Done. All rights reserved.
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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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;;; Code:
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(require 'cl-lib)
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(require 'haskell-interactive-mode)
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(require 'haskell-collapse)
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(require 'haskell-svg)
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(defun haskell-interactive-handle-expr ()
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"Handle an inputted expression at the REPL."
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(let ((expr (haskell-interactive-mode-input)))
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(if (string= "" (replace-regexp-in-string " " "" expr))
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;; Just make a new prompt on space-only input
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(progn
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(goto-char (point-max))
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(insert "\n")
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(haskell-interactive-mode-prompt))
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(when (haskell-interactive-at-prompt)
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(cond
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;; If already evaluating, then the user is trying to send
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;; input to the REPL during evaluation. Most likely in
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;; response to a getLine-like function.
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((and (haskell-process-evaluating-p (haskell-interactive-process))
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(= (line-end-position) (point-max)))
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(goto-char (point-max))
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(let ((process (haskell-interactive-process))
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(string (buffer-substring-no-properties
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haskell-interactive-mode-result-end
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(point))))
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;; here we need to go to end of line again as evil-mode
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;; might have managed to put us one char back
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(goto-char (point-max))
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(insert "\n")
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;; Bring the marker forward
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(setq haskell-interactive-mode-result-end
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(point-max))
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(haskell-process-set-sent-stdin process t)
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(haskell-process-send-string process string)))
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;; Otherwise we start a normal evaluation call.
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(t (setq haskell-interactive-mode-old-prompt-start
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(copy-marker haskell-interactive-mode-prompt-start))
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(set-marker haskell-interactive-mode-prompt-start (point-max))
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(haskell-interactive-mode-history-add expr)
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(haskell-interactive-mode-do-expr expr)))))))
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(defun haskell-interactive-mode-do-expr (expr)
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(cond
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((string-match "^:present " expr)
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(haskell-interactive-mode-do-presentation (replace-regexp-in-string "^:present " "" expr)))
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(t
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(haskell-interactive-mode-run-expr expr))))
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(defun haskell-interactive-mode-run-expr (expr)
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"Run the given expression."
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(let ((session (haskell-interactive-session))
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(process (haskell-interactive-process)))
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(haskell-process-queue-command
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process
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(make-haskell-command
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:state (list session process expr 0)
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:go (lambda (state)
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(goto-char (point-max))
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(insert "\n")
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(setq haskell-interactive-mode-result-end
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(point-max))
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(haskell-process-send-string (cadr state)
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(haskell-interactive-mode-multi-line (cl-caddr state)))
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(haskell-process-set-evaluating (cadr state) t))
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:live (lambda (state buffer)
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(unless (and (string-prefix-p ":q" (cl-caddr state))
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(string-prefix-p (cl-caddr state) ":quit"))
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(let* ((cursor (cl-cadddr state))
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(next (replace-regexp-in-string
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haskell-process-prompt-regex
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""
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(substring buffer cursor))))
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(haskell-interactive-mode-eval-result (car state) next)
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(setf (cl-cdddr state) (list (length buffer)))
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nil)))
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:complete
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(lambda (state response)
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(haskell-process-set-evaluating (cadr state) nil)
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(unless (haskell-interactive-mode-trigger-compile-error state response)
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(haskell-interactive-mode-expr-result state response)))))))
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(defun haskell-interactive-mode-expr-result (state response)
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"Print the result of evaluating the expression."
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(let ((response
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(with-temp-buffer
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(insert response)
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(haskell-interactive-mode-handle-h)
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(buffer-string))))
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(when haskell-interactive-mode-eval-mode
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(unless (haskell-process-sent-stdin-p (cadr state))
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(haskell-interactive-mode-eval-as-mode (car state) response))))
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(haskell-interactive-mode-prompt (car state)))
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(defun haskell-interactive-mode-eval-as-mode (session text)
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"Insert TEXT font-locked according to `haskell-interactive-mode-eval-mode'."
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(with-current-buffer (haskell-session-interactive-buffer session)
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(let ((inhibit-read-only t))
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(delete-region (1+ haskell-interactive-mode-prompt-start) (point))
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(goto-char (point-max))
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(insert (haskell-fontify-as-mode (haskell-svg-maybe-render-images text)
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haskell-interactive-mode-eval-mode))
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(when haskell-interactive-mode-collapse
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(haskell-hide-toggle)))))
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(provide 'haskell-repl)
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