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haskell-interactive-mode.el
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;;; haskell-interactive-mode.el --- The interactive Haskell mode
;; Copyright (C) 2011-2012 Chris Done
;; Author: Chris Done <chrisdone@gmail.com>
;; This file is not part of GNU Emacs.
;; This file 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, or (at your option)
;; any later version.
;; This file 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, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;; Todo:
;;; Code:
(require 'haskell-compile)
(require 'haskell-navigate-imports)
(require 'haskell-process)
(require 'haskell-collapse)
(require 'haskell-session)
(require 'haskell-show)
(require 'haskell-font-lock)
(require 'haskell-presentation-mode)
(require 'ansi-color)
(require 'cl-lib)
(require 'etags)
(defvar haskell-interactive-mode-history-index)
(make-variable-buffer-local 'haskell-interactive-mode-history-index)
(defvar haskell-interactive-mode-history (list))
(make-variable-buffer-local 'haskell-interactive-mode-history)
(defvar haskell-interactive-mode-completion-cache)
(make-variable-buffer-local 'haskell-interactive-mode-completion-cache)
(defvar haskell-interactive-mode-old-prompt-start
nil
"Mark used for the old beginning of the prompt.")
(make-variable-buffer-local 'haskell-interactive-mode-old-prompt-start)
(defun haskell-interactive-prompt-regex ()
"Generate a regex for searching for any occurence of the prompt
at the beginning of the line. This should prevent any
interference with prompts that look like haskell expressions."
(concat "^" (regexp-quote haskell-interactive-prompt)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Globals used internally
(defvar haskell-interactive-mode-map
(let ((map (make-sparse-keymap)))
(define-key map (kbd "RET") 'haskell-interactive-mode-return)
(define-key map (kbd "SPC") 'haskell-interactive-mode-space)
(define-key map (kbd "C-j") 'haskell-interactive-mode-newline-indent)
(define-key map (kbd "C-a") 'haskell-interactive-mode-beginning)
(define-key map (kbd "<home>") 'haskell-interactive-mode-beginning)
(define-key map (kbd "C-c C-k") 'haskell-interactive-mode-clear)
(define-key map (kbd "C-c C-c") 'haskell-process-interrupt)
(define-key map (kbd "C-c C-f") 'next-error-follow-minor-mode)
(define-key map (kbd "C-c C-z") 'haskell-interactive-switch-back)
(define-key map (kbd "M-p") 'haskell-interactive-mode-history-previous)
(define-key map (kbd "M-n") 'haskell-interactive-mode-history-next)
(define-key map (kbd "C-<up>") 'haskell-interactive-mode-history-previous)
(define-key map (kbd "C-<down>") 'haskell-interactive-mode-history-next)
(define-key map (kbd "TAB") 'haskell-interactive-mode-tab)
(define-key map (kbd "<C-S-backspace>") 'haskell-interactive-mode-kill-whole-line)
map)
"Interactive Haskell mode map.")
(define-derived-mode haskell-interactive-mode fundamental-mode "Interactive-Haskell"
"Interactive mode for Haskell.
See Info node `(haskell-mode)haskell-interactive-mode' for more
information.
Key bindings:
\\{haskell-interactive-mode-map}"
:group 'haskell-interactive
(setq haskell-interactive-mode-history (list))
(setq haskell-interactive-mode-history-index 0)
(setq haskell-interactive-mode-completion-cache nil)
(setq next-error-function 'haskell-interactive-next-error-function)
(add-hook 'completion-at-point-functions
'haskell-interactive-mode-completion-at-point-function nil t)
(haskell-interactive-mode-prompt))
(defvar haskell-interactive-mode-prompt-start
nil
"Mark used for the beginning of the prompt.")
(defvar haskell-interactive-mode-result-end
nil
"Mark used to figure out where the end of the current result
output is. Used to distinguish betwen user input.")
(defvar haskell-interactive-previous-buffer nil
"Records the buffer to which `haskell-interactive-switch-back' should jump.
This is set by `haskell-interactive-switch', and should otherwise
be nil.")
(make-variable-buffer-local 'haskell-interactive-previous-buffer)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Hooks
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Mode
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Faces
(defface haskell-interactive-face-prompt
'((t :inherit font-lock-function-name-face))
"Face for the prompt."
:group 'haskell-interactive)
(defface haskell-interactive-face-compile-error
'((t :inherit compilation-error))
"Face for compile errors."
:group 'haskell-interactive)
(defface haskell-interactive-face-compile-warning
'((t :inherit compilation-warning))
"Face for compiler warnings."
:group 'haskell-interactive)
(defface haskell-interactive-face-result
'((t :inherit font-lock-string-face))
"Face for the result."
:group 'haskell-interactive)
(defface haskell-interactive-face-garbage
'((t :inherit font-lock-string-face))
"Face for trailing garbage after a command has completed."
:group 'haskell-interactive)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Actions
(defun haskell-interactive-mode-newline-indent ()
"Make newline and indent."
(interactive)
(newline)
(indent-according-to-mode))
(defun haskell-interactive-mode-kill-whole-line ()
"Kill the whole REPL line."
(interactive)
(kill-region haskell-interactive-mode-prompt-start
(line-end-position)))
(defun haskell-interactive-switch-back ()
"Switch back to the buffer from which this interactive buffer was reached."
(interactive)
(if haskell-interactive-previous-buffer
(switch-to-buffer-other-window haskell-interactive-previous-buffer)
(message "No previous buffer.")))
(defun haskell-interactive-mode-space (n)
"Handle the space key."
(interactive "p")
(if (and (bound-and-true-p god-local-mode)
(fboundp 'god-mode-self-insert))
(call-interactively 'god-mode-self-insert)
(if (haskell-interactive-at-compile-message)
(next-error-no-select 0)
(self-insert-command n))))
(defun haskell-interactive-at-prompt ()
"If at prompt, returns start position of user-input, otherwise returns nil."
(if (>= (point)
haskell-interactive-mode-prompt-start)
haskell-interactive-mode-prompt-start
nil))
(define-derived-mode haskell-error-mode
special-mode "Error"
"Major mode for viewing Haskell compile errors.")
;; (define-key haskell-error-mode-map (kbd "q") 'quit-window)
(defun haskell-interactive-mode-handle-h (&optional bound)
"Handle ^H in output."
(let ((bound (point-min))
(inhibit-read-only t))
(save-excursion
(while (search-backward "\b" bound t 1)
(save-excursion
(forward-char)
(let ((end (point)))
(if (search-backward-regexp "[^\b]" bound t 1)
(forward-char)
(goto-char (point-min)))
(let ((start (point)))
(delete-region (max (- (point) (- end start))
(point-min))
end))))))))
(defun haskell-interactive-mode-cleanup-response (expr response)
"Ignore the mess that GHCi outputs on multi-line input."
(if (not (string-match "\n" expr))
response
(let ((i 0)
(out "")
(lines (length (split-string expr "\n"))))
(cl-loop for part in (split-string response "| ")
do (setq out
(concat out
(if (> i lines)
(concat (if (or (= i 0) (= i (1+ lines))) "" "| ") part)
"")))
do (setq i (1+ i)))
out)))
(defun haskell-interactive-mode-multi-line (expr)
"If a multi-line expression has been entered, then reformat it to be:
:{
do the
multi-liner
expr
:}
"
(if (not (string-match "\n" expr))
expr
(let* ((i 0)
(lines (split-string expr "\n"))
(len (length lines))
(indent (make-string (length haskell-interactive-prompt)
? )))
(mapconcat 'identity
(cl-loop for line in lines
collect (cond ((= i 0)
(concat ":{" "\n" line))
((= i (1- len))
(concat line "\n" ":}"))
(t
line))
do (setq i (1+ i)))
"\n"))))
(defun haskell-interactive-trim (line)
"Trim indentation off of lines in the REPL."
(if (and (string-match "^[ ]+" line)
(> (length line)
(length haskell-interactive-prompt)))
(substring line
(length haskell-interactive-prompt))
line))
(defun haskell-interactive-mode-line-is-query (line)
"Is LINE actually a :t/:k/:i?"
(and (string-match "^:[itk] " line)
t))
(defun haskell-interactive-mode-beginning ()
"Go to the start of the line."
(interactive)
(if (haskell-interactive-at-prompt)
(goto-char haskell-interactive-mode-prompt-start)
(move-beginning-of-line nil)))
(defun haskell-interactive-mode-input-partial ()
"Get the interactive mode input up to point."
(let ((input-start (haskell-interactive-at-prompt)))
(unless input-start
(error "not at prompt"))
(buffer-substring-no-properties input-start (point))))
(defun haskell-interactive-mode-input ()
"Get the interactive mode input."
(buffer-substring-no-properties
haskell-interactive-mode-prompt-start
(point-max)))
(defun haskell-interactive-mode-prompt (&optional session)
"Show a prompt at the end of the REPL buffer.
If SESSION is non-nil, use the REPL buffer associated with
SESSION, otherwise operate on the current buffer.
"
(with-current-buffer (if session
(haskell-session-interactive-buffer session)
(current-buffer))
(goto-char (point-max))
(insert (propertize haskell-interactive-prompt
'font-lock-face 'haskell-interactive-face-prompt
'read-only t
'rear-nonsticky t
'prompt t))
(let ((marker (set (make-local-variable 'haskell-interactive-mode-prompt-start)
(make-marker))))
(set-marker marker
(point)
(current-buffer))
(when nil
(let ((o (make-overlay (point) (point-max) nil nil t)))
(overlay-put o 'line-prefix (make-string (length haskell-interactive-prompt)
? )))))
(when haskell-interactive-mode-scroll-to-bottom
(haskell-interactive-mode-scroll-to-bottom))))
(defun haskell-interactive-mode-eval-result (session text)
"Insert the result of an eval as plain text."
(with-current-buffer (haskell-session-interactive-buffer session)
(goto-char (point-max))
(let ((start (point)))
(insert (ansi-color-apply
(propertize text
'font-lock-face 'haskell-interactive-face-result
'rear-nonsticky t
'read-only t
'prompt t
'result t)))
(haskell-interactive-mode-handle-h start))
(let ((marker (set (make-local-variable 'haskell-interactive-mode-result-end)
(make-marker))))
(set-marker marker
(point)
(current-buffer)))
(when haskell-interactive-mode-scroll-to-bottom
(haskell-interactive-mode-scroll-to-bottom))))
(defun haskell-interactive-mode-scroll-to-bottom ()
"Scroll to bottom."
(let ((w (get-buffer-window (current-buffer))))
(when w
(goto-char (point-max))
(set-window-point w (point-max)))))
(defun haskell-interactive-mode-compile-error (session message)
"Echo an error."
(haskell-interactive-mode-compile-message
session message 'haskell-interactive-face-compile-error))
(defun haskell-interactive-mode-compile-warning (session message)
"Warning message."
(haskell-interactive-mode-compile-message
session message 'haskell-interactive-face-compile-warning))
(defun haskell-interactive-mode-compile-message (session message type)
"Echo a compiler warning."
(with-current-buffer (haskell-session-interactive-buffer session)
(setq next-error-last-buffer (current-buffer))
(save-excursion
(haskell-interactive-mode-goto-end-point)
(let ((lines (string-match "^\\(.*\\)\n\\([[:unibyte:][:nonascii:]]+\\)" message)))
(when lines
(insert (propertize (concat (match-string 1 message) " …\n")
'font-lock-face type
'read-only t
'rear-nonsticky t
'expandable t))
(insert (propertize (concat (match-string 2 message) "\n")
'font-lock-face type
'read-only t
'rear-nonsticky t
'collapsible t
'invisible haskell-interactive-mode-hide-multi-line-errors
'message-length (length (match-string 2 message)))))
(unless lines
(insert (propertize (concat message "\n")
'font-lock-face type
'read-only t
'rear-nonsticky t)))))))
(defun haskell-interactive-mode-insert (session message)
"Echo a read only piece of text before the prompt."
(with-current-buffer (haskell-session-interactive-buffer session)
(save-excursion
(haskell-interactive-mode-goto-end-point)
(insert (propertize message
'read-only t
'rear-nonsticky t)))))
(defun haskell-interactive-mode-goto-end-point ()
"Go to the 'end' of the buffer (before the prompt.)"
(goto-char haskell-interactive-mode-prompt-start)
(goto-char (line-beginning-position)))
(defun haskell-interactive-mode-history-add (input)
"Add item to the history."
(setq haskell-interactive-mode-history
(cons ""
(cons input
(cl-remove-if (lambda (i) (or (string= i input) (string= i "")))
haskell-interactive-mode-history))))
(setq haskell-interactive-mode-history-index
0))
(defun haskell-mode-message-line (str)
"Message only one line, multiple lines just disturbs the programmer."
(let ((lines (split-string str "\n" t)))
(when (and (car lines) (stringp (car lines)))
(message "%s"
(concat (car lines)
(if (and (cdr lines) (stringp (cadr lines)))
(format " [ %s .. ]" (haskell-string-take (haskell-trim (cadr lines)) 10))
""))))))
(defun haskell-interactive-mode-tab ()
"Do completion if at prompt or else try collapse/expand."
(interactive)
(cond
((haskell-interactive-at-prompt)
(completion-at-point))
((get-text-property (point) 'collapsible)
(let ((column (current-column)))
(search-backward-regexp "^[^ ]")
(haskell-interactive-mode-tab-expand)
(goto-char (+ column (line-beginning-position)))))
(t (haskell-interactive-mode-tab-expand))))
(defun haskell-interactive-mode-tab-expand ()
"Expand the rest of the message."
(cond ((get-text-property (point) 'expandable)
(let* ((pos (1+ (line-end-position)))
(visibility (get-text-property pos 'invisible))
(length (1+ (get-text-property pos 'message-length))))
(let ((inhibit-read-only t))
(put-text-property pos
(+ pos length)
'invisible
(not visibility)))))))
(defconst haskell-interactive-mode-error-regexp
"^\\([A-Z]?:?[^\r\n:]+\\):\\([0-9()-:]+\\):?")
(defun haskell-interactive-at-compile-message ()
"Am I on a compile message?"
(and (not (haskell-interactive-at-prompt))
(save-excursion
(goto-char (line-beginning-position))
(looking-at haskell-interactive-mode-error-regexp))))
(defun haskell-interactive-mode-error-backward (&optional count)
"Go backward to the previous error."
(interactive)
(search-backward-regexp haskell-interactive-mode-error-regexp nil t count))
(defun haskell-interactive-mode-error-forward (&optional count)
"Go forward to the next error, or return to the REPL."
(interactive)
(goto-char (line-end-position))
(if (search-forward-regexp haskell-interactive-mode-error-regexp nil t count)
(progn (goto-char (line-beginning-position))
t)
(progn (goto-char (point-max))
nil)))
(defun haskell-interactive-mode-delete-compile-messages (session &optional file-name)
"Delete compile messages in REPL buffer.
If FILE-NAME is non-nil, restrict to removing messages concerning
FILE-NAME only."
(with-current-buffer (haskell-session-interactive-buffer session)
(save-excursion
(goto-char (point-min))
(when (search-forward-regexp "^Compilation failed.$" nil t 1)
(let ((inhibit-read-only t))
(delete-region (line-beginning-position)
(1+ (line-end-position))))
(goto-char (point-min)))
(while (when (re-search-forward haskell-interactive-mode-error-regexp nil t)
(let ((msg-file-name (match-string-no-properties 1))
(msg-startpos (line-beginning-position)))
;; skip over hanging continuation message lines
(while (progn (forward-line) (looking-at "^[ ]+")))
(when (or (not file-name) (string= file-name msg-file-name))
(let ((inhibit-read-only t))
(set-text-properties msg-startpos (point) nil))
(delete-region msg-startpos (point))
))
t)))))
;;;###autoload
(defun haskell-interactive-mode-reset-error (session)
"Reset the error cursor position."
(interactive)
(with-current-buffer (haskell-session-interactive-buffer session)
(haskell-interactive-mode-goto-end-point)
(let ((mrk (point-marker)))
(haskell-session-set session 'next-error-locus nil)
(haskell-session-set session 'next-error-region (cons mrk (copy-marker mrk t))))
(goto-char (point-max))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Misc
(defun haskell-session-interactive-buffer (s)
"Get the session interactive buffer."
(let ((buffer (haskell-session-get s 'interactive-buffer)))
(if (and buffer (buffer-live-p buffer))
buffer
(let ((buffer (get-buffer-create (format "*%s*" (haskell-session-name s)))))
(haskell-session-set-interactive-buffer s buffer)
(with-current-buffer buffer
(haskell-interactive-mode)
(haskell-session-assign s))
(switch-to-buffer-other-window buffer)
buffer))))
(defun haskell-process-cabal-live (state buffer)
"Do live updates for Cabal processes."
(haskell-interactive-mode-insert
(haskell-process-session (cadr state))
(replace-regexp-in-string
haskell-process-prompt-regex
""
(substring buffer (cl-cadddr state))))
(setf (cl-cdddr state) (list (length buffer)))
nil)
(defun haskell-process-parse-error (string)
"Parse the line number from the error."
(let ((span nil))
(cl-loop for regex
in haskell-compilation-error-regexp-alist
do (when (string-match (car regex) string)
(setq span
(list :file (match-string 1 string)
:line (string-to-number (match-string 2 string))
:col (string-to-number (match-string 4 string))
:line2 (when (match-string 3 string)
(string-to-number (match-string 3 string)))
:col2 (when (match-string 5 string)
(string-to-number (match-string 5 string)))))))
span))
(defun haskell-process-suggest-add-package (session msg)
"Add the (matched) module to your cabal file."
(let* ((suggested-package (match-string 1 msg))
(package-name (replace-regexp-in-string "-[^-]+$" "" suggested-package))
(version (progn (string-match "\\([^-]+\\)$" suggested-package)
(match-string 1 suggested-package)))
(cabal-file (concat (haskell-session-name session)
".cabal")))
(when (y-or-n-p
(format "Add `%s' to %s?"
package-name
cabal-file))
(haskell-cabal-add-dependency package-name version nil t))))
(defun haskell-process-suggest-remove-import (session file import line)
"Suggest removing or commenting out IMPORT on LINE."
(let ((continue t)
(first t))
(cl-case (read-event
(propertize (format "%sThe import line `%s' is redundant. Remove? (y, n, c: comment out) "
(if (not first)
"Please answer n, y or c: "
"")
import)
'face 'minibuffer-prompt))
(?y
(haskell-process-find-file session file)
(save-excursion
(goto-char (point-min))
(forward-line (1- line))
(goto-char (line-beginning-position))
(delete-region (line-beginning-position)
(line-end-position))))
(?n
(message "Ignoring redundant import %s" import))
(?c
(haskell-process-find-file session file)
(save-excursion
(goto-char (point-min))
(forward-line (1- line))
(goto-char (line-beginning-position))
(insert "-- "))))))
(defun haskell-process-find-file (session file)
"Find the given file in the project."
(find-file (cond ((file-exists-p (concat (haskell-session-current-dir session) "/" file))
(concat (haskell-session-current-dir session) "/" file))
((file-exists-p (concat (haskell-session-cabal-dir session) "/" file))
(concat (haskell-session-cabal-dir session) "/" file))
(t file))))
(defun haskell-process-suggest-pragma (session pragma extension file)
"Suggest to add something to the top of the file."
(let ((string (format "{-# %s %s #-}" pragma extension)))
(when (y-or-n-p (format "Add %s to the top of the file? " string))
(haskell-process-find-file session file)
(save-excursion
(goto-char (point-min))
(insert (concat string "\n"))))))
(defun haskell-interactive-mode-insert-error (response)
"Insert an error message."
(insert "\n"
(haskell-fontify-as-mode
response
'haskell-mode))
(haskell-interactive-mode-prompt))
(defun haskell-interactive-popup-error (response)
"Popup an error."
(if haskell-interactive-popup-errors
(let ((buf (get-buffer-create "*HS-Error*")))
(pop-to-buffer buf nil t)
(with-current-buffer buf
(haskell-error-mode)
(let ((inhibit-read-only t))
(erase-buffer)
(insert (propertize response
'font-lock-face
'haskell-interactive-face-compile-error))
(goto-char (point-min))
(delete-blank-lines)
(insert (propertize "-- Hit `q' to close this window.\n\n"
'font-lock-face 'font-lock-comment-face))
(save-excursion
(goto-char (point-max))
(insert (propertize "\n-- To disable popups, customize `haskell-interactive-popup-errors'.\n\n"
'font-lock-face 'font-lock-comment-face))))))
(haskell-interactive-mode-insert-error response)))
(defun haskell-interactive-next-error-function (&optional n reset)
"See `next-error-function' for more information."
(let* ((session (haskell-interactive-session))
(next-error-region (haskell-session-get session 'next-error-region))
(next-error-locus (haskell-session-get session 'next-error-locus))
(reset-locus nil))
(when (and next-error-region (or reset (and (/= n 0) (not next-error-locus))))
(goto-char (car next-error-region))
(unless (looking-at haskell-interactive-mode-error-regexp)
(haskell-interactive-mode-error-forward))
(setq reset-locus t)
(unless (looking-at haskell-interactive-mode-error-regexp)
(error "no errors found")))
;; move point if needed
(cond
(reset-locus nil)
((> n 0) (unless (haskell-interactive-mode-error-forward n)
(error "no more errors")))
((< n 0) (unless (haskell-interactive-mode-error-backward (- n))
(error "no more errors"))))
(let ((orig-line (buffer-substring-no-properties (line-beginning-position) (line-end-position))))
(when (string-match haskell-interactive-mode-error-regexp orig-line)
(let* ((msgmrk (set-marker (make-marker) (line-beginning-position)))
(location (haskell-process-parse-error orig-line))
(file (plist-get location :file))
(line (plist-get location :line))
(col1 (plist-get location :col))
(col2 (plist-get location :col2))
(cabal-relative-file (expand-file-name file (haskell-session-cabal-dir session)))
(src-relative-file (expand-file-name file (haskell-session-current-dir session)))
(real-file (cond ((file-exists-p cabal-relative-file) cabal-relative-file)
((file-exists-p src-relative-file) src-relative-file))))
(haskell-session-set session 'next-error-locus msgmrk)
(if real-file
(let ((m1 (make-marker))
(m2 (make-marker)))
(with-current-buffer (find-file-noselect real-file)
(save-excursion
(goto-char (point-min))
(forward-line (1- line))
(set-marker m1 (+ col1 (point) -1))
(when col2
(set-marker m2 (- (point) col2)))))
;; ...finally select&hilight error locus
(compilation-goto-locus msgmrk m1 (and (marker-position m2) m2)))
(error "don't know where to find %S" file)))))))
(defun haskell-interactive-session ()
"Get the `haskell-session', throw an error if it's not
available."
(or (haskell-session-maybe)
(haskell-session-assign
(or (haskell-session-from-buffer)
(haskell-session-choose)
(error "No session associated with this buffer. Try M-x haskell-session-change or report this as a bug.")))))
(defun haskell-interactive-process ()
"Get the Haskell session."
(or (haskell-session-process (haskell-interactive-session))
(error "No Haskell session/process associated with this
buffer. Maybe run M-x haskell-process-restart?")))
(defun haskell-interactive-mode-do-presentation (expr)
"Present the given expression. Requires the `present` package
to be installed. Will automatically import it qualified as Present."
(let ((p (haskell-interactive-process)))
;; If Present.code isn't available, we probably need to run the
;; setup.
(unless (string-match "^Present" (haskell-process-queue-sync-request p ":t Present.encode"))
(haskell-interactive-mode-setup-presentation p))
;; Happily, let statements don't affect the `it' binding in any
;; way, so we can fake it, no pun intended.
(let ((error (haskell-process-queue-sync-request
p (concat "let it = Present.asData (" expr ")"))))
(if (not (string= "" error))
(haskell-interactive-mode-eval-result (haskell-interactive-session) (concat error "\n"))
(let ((hash (haskell-interactive-mode-presentation-hash)))
(haskell-process-queue-sync-request
p (format "let %s = Present.asData (%s)" hash expr))
(let* ((presentation (haskell-interactive-mode-present-id
hash
(list 0))))
(insert "\n")
(haskell-interactive-mode-insert-presentation hash presentation)
(haskell-interactive-mode-eval-result (haskell-interactive-session) "\n"))))
(haskell-interactive-mode-prompt (haskell-interactive-session)))))
(defun haskell-interactive-mode-present-id (hash id)
"Generate a presentation for the current expression at ID."
;; See below for commentary of this statement.
(let ((p (haskell-interactive-process)))
(haskell-process-queue-without-filters
p "let _it = it")
(let* ((text (haskell-process-queue-sync-request
p
(format "Present.putStr (Present.encode (Present.fromJust (Present.present (Present.fromJust (Present.fromList [%s])) %s)))"
(mapconcat 'identity (mapcar 'number-to-string id) ",")
hash)))
(reply
(if (string-match "^*** " text)
'((rep nil))
(read text))))
;; Not necessary, but nice to restore it to the expression that
;; the user actually typed in.
(haskell-process-queue-without-filters
p "let it = _it")
reply)))
(defun haskell-presentation-present-slot (btn)
"The callback to evaluate the slot and present it in place of the button."
(let ((id (button-get btn 'presentation-id))
(hash (button-get btn 'hash))
(parent-rep (button-get btn 'parent-rep))
(continuation (button-get btn 'continuation)))
(let ((point (point)))
(button-put btn 'invisible t)
(delete-region (button-start btn) (button-end btn))
(haskell-interactive-mode-insert-presentation
hash
(haskell-interactive-mode-present-id hash id)
parent-rep
continuation)
(when (> (point) point)
(goto-char (1+ point))))))
(defun haskell-interactive-mode-presentation-slot (hash slot parent-rep &optional continuation)
"Make a slot at point, pointing to ID."
(let ((type (car slot))
(id (cadr slot)))
(if (member (intern type) '(Integer Char Int Float Double))
(haskell-interactive-mode-insert-presentation
hash
(haskell-interactive-mode-present-id hash id)
parent-rep
continuation)
(haskell-interactive-mode-presentation-slot-button slot parent-rep continuation hash))))
(defun haskell-interactive-mode-presentation-slot-button (slot parent-rep continuation hash)
(let ((start (point))
(type (car slot))
(id (cadr slot)))
(insert (propertize type 'font-lock-face '(:height 0.8 :underline t :inherit font-lock-comment-face)))
(let ((button (make-text-button start (point)
:type 'haskell-presentation-slot-button)))
(button-put button 'hide-on-click t)
(button-put button 'presentation-id id)
(button-put button 'parent-rep parent-rep)
(button-put button 'continuation continuation)
(button-put button 'hash hash))))
(defun haskell-interactive-mode-insert-presentation (hash presentation &optional parent-rep continuation)
"Insert the presentation, hooking up buttons for each slot."
(let* ((rep (cadr (assoc 'rep presentation)))
(text (cadr (assoc 'text presentation)))
(type (cadr (assoc 'type presentation)))
(slots (cadr (assoc 'slots presentation)))
(nullary (null slots)))
(cond
((string= "integer" rep)
(insert (propertize text 'font-lock-face 'font-lock-constant)))
((string= "floating" rep)
(insert (propertize text 'font-lock-face 'font-lock-constant)))
((string= "char" rep)
(insert (propertize
(if (string= "string" parent-rep)
(replace-regexp-in-string "^'\\(.+\\)'$" "\\1" text)
text)
'font-lock-face 'font-lock-string-face)))
((string= "tuple" rep)
(insert "(")
(let ((first t))
(cl-loop for slot in slots
do (unless first (insert ","))
do (haskell-interactive-mode-presentation-slot hash slot rep)
do (setq first nil)))
(insert ")"))
((string= "list" rep)
(if (null slots)
(if continuation
(progn (delete-char -1)
(delete-indentation))
(insert "[]"))
(let ((i 0))
(unless continuation
(insert "["))
(let ((start-column (current-column)))
(cl-loop for slot in slots
do (haskell-interactive-mode-presentation-slot
hash
slot
rep
(= i (1- (length slots))))
do (when (not (= i (1- (length slots))))
(insert "\n")
(indent-to (1- start-column))
(insert ","))
do (setq i (1+ i))))
(unless continuation
(insert "]")))))
((string= "string" rep)
(unless (string= "string" parent-rep)
(insert (propertize "\"" 'font-lock-face 'font-lock-string-face)))
(cl-loop for slot in slots
do (haskell-interactive-mode-presentation-slot hash slot rep))
(unless (string= "string" parent-rep)
(insert (propertize "\"" 'font-lock-face 'font-lock-string-face))))
((string= "alg" rep)
(when (and parent-rep
(not nullary)
(not (string= "list" parent-rep)))
(insert "("))
(let ((start-column (current-column)))
(insert (propertize text 'font-lock-face 'font-lock-type-face))
(cl-loop for slot in slots
do (insert "\n")
do (indent-to (+ 2 start-column))
do (haskell-interactive-mode-presentation-slot hash slot rep)))
(when (and parent-rep
(not nullary)
(not (string= "list" parent-rep)))
(insert ")")))
((string= "record" rep)
(let ((start-column (current-column)))
(insert (propertize text 'font-lock-face 'font-lock-type-face)
" { ")
(cl-loop for field in slots
do (insert "\n")
do (indent-to (+ 2 start-column))
do (let ((name (nth 0 field))
(slot (nth 1 field)))
(insert name " = ")
(haskell-interactive-mode-presentation-slot hash slot rep)))
(insert "\n")
(indent-to start-column)
(insert "}")))
((eq rep nil)
(insert (propertize "?" 'font-lock-face 'font-lock-warning)))
(t
(let ((err "Unable to present! This very likely means Emacs
is out of sync with the `present' package. You should make sure
they're both up to date, or report a bug."))
(insert err)
(error err))))))
(defun haskell-interactive-mode-setup-presentation (p)
"Setup the GHCi REPL for using presentations.
Using asynchronous queued commands as opposed to sync at this
stage, as sync would freeze up the UI a bit, and we actually
don't care when the thing completes as long as it's soonish."
;; Import dependencies under Present.* namespace
(haskell-process-queue-without-filters p "import qualified Data.Maybe as Present")
(haskell-process-queue-without-filters p "import qualified Data.ByteString.Lazy as Present")
(haskell-process-queue-without-filters p "import qualified Data.AttoLisp as Present")
(haskell-process-queue-without-filters p "import qualified Present.ID as Present")
(haskell-process-queue-without-filters p "import qualified Present as Present")
;; Make a dummy expression to avoid "Loading package" nonsense
(haskell-process-queue-without-filters
p "Present.present (Present.fromJust (Present.fromList [0])) ()"))
(defvar haskell-interactive-mode-presentation-hash 0
"Counter for the hash.")
(defun haskell-interactive-mode-presentation-hash ()
"Generate a presentation hash."
(format "_present_%s"
(setq haskell-interactive-mode-presentation-hash
(1+ haskell-interactive-mode-presentation-hash))))
(define-button-type 'haskell-presentation-slot-button
'action 'haskell-presentation-present-slot
'follow-link t
'help-echo "Click to expand…")
(defun haskell-interactive-mode-history-toggle (n)
"Toggle the history n items up or down."
(unless (null haskell-interactive-mode-history)
(setq haskell-interactive-mode-history-index
(mod (+ haskell-interactive-mode-history-index n)
(length haskell-interactive-mode-history)))
(unless (zerop haskell-interactive-mode-history-index)
(message "History item: %d" haskell-interactive-mode-history-index))
(haskell-interactive-mode-set-prompt
(nth haskell-interactive-mode-history-index
haskell-interactive-mode-history))))
(defun haskell-interactive-mode-set-prompt (p)
"Set (and overwrite) the current prompt."
(with-current-buffer (haskell-session-interactive-buffer (haskell-interactive-session))
(goto-char haskell-interactive-mode-prompt-start)
(delete-region (point) (point-max))
(insert p)))
(defun haskell-interactive-mode-history-previous (arg)
"Cycle backwards through input history."
(interactive "*p")
(when (haskell-interactive-at-prompt)
(if (not (zerop arg))
(haskell-interactive-mode-history-toggle arg)
(setq haskell-interactive-mode-history-index 0)
(haskell-interactive-mode-history-toggle 1))))
(defun haskell-interactive-mode-history-next (arg)
"Cycle forward through input history."
(interactive "*p")
(when (haskell-interactive-at-prompt)
(if (not (zerop arg))
(haskell-interactive-mode-history-toggle (- arg))
(setq haskell-interactive-mode-history-index 0)
(haskell-interactive-mode-history-toggle -1))))
(defun haskell-interactive-mode-clear ()
"Clear the screen and put any current input into the history."
(interactive)
(let ((session (haskell-interactive-session)))
(with-current-buffer (haskell-session-interactive-buffer session)
(let ((inhibit-read-only t))
(set-text-properties (point-min) (point-max) nil))
(delete-region (point-min) (point-max))
(remove-overlays)
(haskell-interactive-mode-prompt session)
(haskell-session-set session 'next-error-region nil)
(haskell-session-set session 'next-error-locus nil))
(with-current-buffer (get-buffer-create "*haskell-process-log*")
(delete-region (point-min) (point-max))
(remove-overlays))))
(defun haskell-interactive-mode-completion-at-point-function ()
"Offer completions for partial expression between prompt and point"
(when (haskell-interactive-at-prompt)
(let* ((process (haskell-interactive-process))
(session (haskell-interactive-session))
(inp (haskell-interactive-mode-input-partial)))
(if (string= inp (car-safe haskell-interactive-mode-completion-cache))
(cdr haskell-interactive-mode-completion-cache)
(let* ((resp2 (haskell-process-get-repl-completions process inp))
(rlen (- (length inp) (length (car resp2))))
(coll (append (if (string-prefix-p inp "import") '("import"))
(if (string-prefix-p inp "let") '("let"))
(cdr resp2)))
(result (list (- (point) rlen) (point) coll)))
(setq haskell-interactive-mode-completion-cache (cons inp result))
result)))))
(defun haskell-interactive-mode-trigger-compile-error (state response)
"Look for an <interactive> compile error; if there is one, pop
that up in a buffer, similar to `debug-on-error'."
(when (and haskell-interactive-types-for-show-ambiguous
(string-match "^\n<interactive>:[0-9]+:[0-9]+:" response)