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;;; ob-haskell.el --- Babel Functions for Haskell -*- lexical-binding: t; -*-
;; Copyright (C) 2009-2018 Free Software Foundation, Inc.
;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: https://orgmode.org
;; This file is part of GNU Emacs.
;; GNU Emacs 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 of the License, or
;; (at your option) any later version.
;; GNU Emacs 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. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Org-Babel support for evaluating haskell source code. This one will
;; be sort of tricky because haskell programs must be compiled before
;; they can be run, but haskell code can also be run through an
;; interactive interpreter.
;;
;; For now lets only allow evaluation using the haskell interpreter.
;;; Requirements:
;; - haskell-mode :: http://www.iro.umontreal.ca/~monnier/elisp/#haskell-mode
;;
;; - inf-haskell :: http://www.iro.umontreal.ca/~monnier/elisp/#haskell-mode
;;
;; - (optionally) lhs2tex :: http://people.cs.uu.nl/andres/lhs2tex/
;;; Code:
(require 'ob)
(require 'comint)
(declare-function org-remove-indentation "org" (code &optional n))
(declare-function org-trim "org" (s &optional keep-lead))
(declare-function haskell-mode "ext:haskell-mode" ())
(declare-function run-haskell "ext:inf-haskell" (&optional arg))
(declare-function inferior-haskell-load-file
"ext:inf-haskell" (&optional reload))
(defvar org-babel-tangle-lang-exts)
(add-to-list 'org-babel-tangle-lang-exts '("haskell" . "hs"))
(defvar org-babel-default-header-args:haskell
'((:padlines . "no")))
(defvar org-babel-haskell-lhs2tex-command "lhs2tex")
(defvar org-babel-haskell-eoe "\"org-babel-haskell-eoe\"")
(defvar haskell-prompt-regexp)
(defun org-babel-execute:haskell (body params)
"Execute a block of Haskell code."
(require 'inf-haskell)
(add-hook 'inferior-haskell-hook
(lambda ()
(setq-local comint-prompt-regexp
(concat haskell-prompt-regexp "\\|^λ?> "))))
(let* ((session (cdr (assq :session params)))
(result-type (cdr (assq :result-type params)))
(full-body (org-babel-expand-body:generic
body params
(org-babel-variable-assignments:haskell params)))
(session (org-babel-haskell-initiate-session session params))
(comint-preoutput-filter-functions
(cons 'ansi-color-filter-apply comint-preoutput-filter-functions))
(raw (org-babel-comint-with-output
(session org-babel-haskell-eoe t full-body)
(insert (org-trim full-body))
(comint-send-input nil t)
(insert org-babel-haskell-eoe)
(comint-send-input nil t)))
(results (mapcar
#'org-babel-strip-quotes
(cdr (member org-babel-haskell-eoe
(reverse (mapcar #'org-trim raw)))))))
(org-babel-reassemble-table
(let ((result
(pcase result-type
(`output (mapconcat #'identity (reverse (cdr results)) "\n"))
(`value (car results)))))
(org-babel-result-cond (cdr (assq :result-params params))
result (org-babel-script-escape result)))
(org-babel-pick-name (cdr (assq :colname-names params))
(cdr (assq :colname-names params)))
(org-babel-pick-name (cdr (assq :rowname-names params))
(cdr (assq :rowname-names params))))))
(defun org-babel-haskell-initiate-session (&optional _session _params)
"Initiate a haskell session.
If there is not a current inferior-process-buffer in SESSION
then create one. Return the initialized session."
(require 'inf-haskell)
(or (get-buffer "*haskell*")
(save-window-excursion (run-haskell) (sleep-for 0.25) (current-buffer))))
(defun org-babel-load-session:haskell (session body params)
"Load BODY into SESSION."
(save-window-excursion
(let* ((buffer (org-babel-prep-session:haskell session params))
(load-file (concat (org-babel-temp-file "haskell-load-") ".hs")))
(with-temp-buffer
(insert body) (write-file load-file)
(haskell-mode) (inferior-haskell-load-file))
buffer)))
(defun org-babel-prep-session:haskell (session params)
"Prepare SESSION according to the header arguments in PARAMS."
(save-window-excursion
(let ((buffer (org-babel-haskell-initiate-session session)))
(org-babel-comint-in-buffer buffer
(mapc (lambda (line)
(insert line)
(comint-send-input nil t))
(org-babel-variable-assignments:haskell params)))
(current-buffer))))
(defun org-babel-variable-assignments:haskell (params)
"Return list of haskell statements assigning the block's variables."
(mapcar (lambda (pair)
(format "let %s = %s"
(car pair)
(org-babel-haskell-var-to-haskell (cdr pair))))
(org-babel--get-vars params)))
(defun org-babel-haskell-var-to-haskell (var)
"Convert an elisp value VAR into a haskell variable.
The elisp VAR is converted to a string of haskell source code
specifying a variable of the same value."
(if (listp var)
(concat "[" (mapconcat #'org-babel-haskell-var-to-haskell var ", ") "]")
(format "%S" var)))
(defvar org-export-copy-to-kill-ring)
(declare-function org-export-to-file "ox"
(backend file
&optional async subtreep visible-only body-only
ext-plist post-process))
(defun org-babel-haskell-export-to-lhs (&optional arg)
"Export to a .lhs file with all haskell code blocks escaped.
When called with a prefix argument the resulting
.lhs file will be exported to a .tex file. This function will
create two new files, base-name.lhs and base-name.tex where
base-name is the name of the current Org file.
Note that all standard Babel literate programming
constructs (header arguments, no-web syntax etc...) are ignored."
(interactive "P")
(let* ((contents (buffer-string))
(haskell-regexp
(concat "^\\([ \t]*\\)#\\+begin_src[ \t]haskell*\\(.*\\)?[\r\n]"
"\\([^\000]*?\\)[\r\n][ \t]*#\\+end_src.*"))
(base-name (file-name-sans-extension (buffer-file-name)))
(tmp-file (org-babel-temp-file "haskell-"))
(tmp-org-file (concat tmp-file ".org"))
(tmp-tex-file (concat tmp-file ".tex"))
(lhs-file (concat base-name ".lhs"))
(tex-file (concat base-name ".tex"))
(command (concat org-babel-haskell-lhs2tex-command
" " (org-babel-process-file-name lhs-file)
" > " (org-babel-process-file-name tex-file)))
(preserve-indentp org-src-preserve-indentation)
indentation)
;; escape haskell source-code blocks
(with-temp-file tmp-org-file
(insert contents)
(goto-char (point-min))
(while (re-search-forward haskell-regexp nil t)
(save-match-data (setq indentation (length (match-string 1))))
(replace-match (save-match-data
(concat
"#+begin_export latex\n\\begin{code}\n"
(if (or preserve-indentp
(string-match "-i" (match-string 2)))
(match-string 3)
(org-remove-indentation (match-string 3)))
"\n\\end{code}\n#+end_export\n"))
t t)
(indent-code-rigidly (match-beginning 0) (match-end 0) indentation)))
(save-excursion
;; export to latex w/org and save as .lhs
(require 'ox-latex)
(find-file tmp-org-file)
;; Ensure we do not clutter kill ring with incomplete results.
(let (org-export-copy-to-kill-ring)
(org-export-to-file 'latex tmp-tex-file))
(kill-buffer nil)
(delete-file tmp-org-file)
(find-file tmp-tex-file)
(goto-char (point-min)) (forward-line 2)
(insert "%include polycode.fmt\n")
;; ensure all \begin/end{code} statements start at the first column
(while (re-search-forward "^[ \t]+\\\\begin{code}[^\000]+\\\\end{code}" nil t)
(replace-match (save-match-data (org-remove-indentation (match-string 0)))
t t))
(setq contents (buffer-string))
(save-buffer) (kill-buffer nil))
(delete-file tmp-tex-file)
;; save org exported latex to a .lhs file
(with-temp-file lhs-file (insert contents))
(if (not arg)
(find-file lhs-file)
;; process .lhs file with lhs2tex
(message "running %s" command) (shell-command command) (find-file tex-file))))
(provide 'ob-haskell)
;;; ob-haskell.el ends here
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