lisp/ob-haskell.el

   1 ;;; ob-haskell.el --- org-babel functions for haskell evaluation
   2
   3 ;; Copyright (C) 2009, 2010  Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   6 ;; Keywords: literate programming, reproducible research
   7 ;; Homepage: http://orgmode.org
   8 ;; Version: 7.5
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; Org-Babel support for evaluating haskell source code.  This one will
  28 ;; be sort of tricky because haskell programs must be compiled before
  29 ;; they can be run, but haskell code can also be run through an
  30 ;; interactive interpreter.
  31 ;;
  32 ;; For now lets only allow evaluation using the haskell interpreter.
  33
  34 ;;; Requirements:
  35
  36 ;; - haskell-mode :: http://www.iro.umontreal.ca/~monnier/elisp/#haskell-mode
  37 ;;
  38 ;; - inf-haskell :: http://www.iro.umontreal.ca/~monnier/elisp/#haskell-mode
  39 ;;
  40 ;; - (optionally) lhs2tex :: http://people.cs.uu.nl/andres/lhs2tex/
  41
  42 ;;; Code:
  43 (require 'ob)
  44 (require 'ob-comint)
  45 (require 'comint)
  46 (eval-when-compile (require 'cl))
  47
  48 (declare-function org-remove-indentation "org" (code &optional n))
  49 (declare-function haskell-mode "ext:haskell-mode" ())
  50 (declare-function run-haskell "ext:inf-haskell" (&optional arg))
  51 (declare-function inferior-haskell-load-file
  52                   "ext:inf-haskell" (&optional reload))
  53
  54 (defvar org-babel-tangle-lang-exts)
  55 (add-to-list 'org-babel-tangle-lang-exts '("haskell" . "hs"))
  56
  57 (defvar org-babel-default-header-args:haskell '())
  58
  59 (defvar org-babel-haskell-lhs2tex-command "lhs2tex")
  60
  61 (defvar org-babel-haskell-eoe "\"org-babel-haskell-eoe\"")
  62
  63 (defun org-babel-execute:haskell (body params)
  64   "Execute a block of Haskell code."
  65   (let* ((session (cdr (assoc :session params)))
  66          (vars (mapcar #'cdr (org-babel-get-header params :var)))
  67          (result-type (cdr (assoc :result-type params)))
  68          (full-body (org-babel-expand-body:generic
  69                      body params
  70                      (org-babel-variable-assignments:haskell params)))
  71          (session (org-babel-haskell-initiate-session session params))
  72          (raw (org-babel-comint-with-output
  73                   (session org-babel-haskell-eoe t full-body)
  74                 (insert (org-babel-trim full-body))
  75                 (comint-send-input nil t)
  76                 (insert org-babel-haskell-eoe)
  77                 (comint-send-input nil t)))
  78          (results (mapcar
  79                    #'org-babel-haskell-read-string
  80                    (cdr (member org-babel-haskell-eoe
  81                                 (reverse (mapcar #'org-babel-trim raw)))))))
  82     (org-babel-reassemble-table
  83      (cond
  84       ((equal result-type 'output)
  85        (mapconcat #'identity (reverse (cdr results)) "\n"))
  86       ((equal result-type 'value)
  87        (org-babel-haskell-table-or-string (car results))))
  88      (org-babel-pick-name (cdr (assoc :colname-names params))
  89                           (cdr (assoc :colname-names params)))
  90      (org-babel-pick-name (cdr (assoc :rowname-names params))
  91                           (cdr (assoc :rowname-names params))))))
  92
  93 (defun org-babel-haskell-read-string (string)
  94   "Strip \\\"s from around a haskell string."
  95   (if (string-match "^\"\\([^\000]+\\)\"$" string)
  96       (match-string 1 string)
  97     string))
  98
  99 (defun org-babel-haskell-initiate-session (&optional session params)
 100   "Initiate a haskell session.
 101 If there is not a current inferior-process-buffer in SESSION
 102 then create one.  Return the initialized session."
 103   (require 'inf-haskell)
 104   (or (get-buffer "*haskell*")
 105       (save-window-excursion (run-haskell) (sleep-for 0.25) (current-buffer))))
 106
 107 (defun org-babel-load-session:haskell (session body params)
 108   "Load BODY into SESSION."
 109   (save-window-excursion
 110     (let* ((buffer (org-babel-prep-session:haskell session params))
 111            (load-file (concat (org-babel-temp-file "haskell-load-") ".hs")))
 112       (with-temp-buffer
 113         (insert body) (write-file load-file)
 114         (haskell-mode) (inferior-haskell-load-file))
 115       buffer)))
 116
 117 (defun org-babel-prep-session:haskell (session params)
 118   "Prepare SESSION according to the header arguments in PARAMS."
 119   (save-window-excursion
 120     (let ((buffer (org-babel-haskell-initiate-session session)))
 121       (org-babel-comint-in-buffer buffer
 122         (mapc (lambda (line)
 123                 (insert line)
 124                 (comint-send-input nil t))
 125               (org-babel-variable-assignments:haskell params)))
 126       (current-buffer))))
 127
 128 (defun org-babel-variable-assignments:haskell (params)
 129   "Return list of haskell statements assigning the block's variables"
 130   (mapcar (lambda (pair)
 131             (format "let %s = %s"
 132                     (car pair)
 133                     (org-babel-haskell-var-to-haskell (cdr pair))))
 134    (mapcar #'cdr (org-babel-get-header params :var))))
 135
 136 (defun org-babel-haskell-table-or-string (results)
 137   "Convert RESULTS to an Emacs-lisp table or string.
 138 If RESULTS look like a table, then convert them into an
 139 Emacs-lisp table, otherwise return the results as a string."
 140   (org-babel-script-escape results))
 141
 142 (defun org-babel-haskell-var-to-haskell (var)
 143   "Convert an elisp value VAR into a haskell variable.
 144 The elisp VAR is converted to a string of haskell source code
 145 specifying a variable of the same value."
 146   (if (listp var)
 147       (concat "[" (mapconcat #'org-babel-haskell-var-to-haskell var ", ") "]")
 148     (format "%S" var)))
 149
 150 (defvar org-src-preserve-indentation)
 151 (defun org-babel-haskell-export-to-lhs (&optional arg)
 152   "Export to a .lhs file with all haskell code blocks escaped.
 153 When called with a prefix argument the resulting
 154 .lhs file will be exported to a .tex file.  This function will
 155 create two new files, base-name.lhs and base-name.tex where
 156 base-name is the name of the current org-mode file.
 157
 158 Note that all standard Babel literate programming
 159 constructs (header arguments, no-web syntax etc...) are ignored."
 160   (interactive "P")
 161   (let* ((contents (buffer-string))
 162          (haskell-regexp
 163           (concat "^\\([ \t]*\\)#\\+begin_src[ \t]haskell*\\(.*\\)?[\r\n]"
 164                   "\\([^\000]*?\\)[\r\n][ \t]*#\\+end_src.*"))
 165          (base-name (file-name-sans-extension (buffer-file-name)))
 166          (tmp-file (org-babel-temp-file "haskell-"))
 167          (tmp-org-file (concat tmp-file ".org"))
 168          (tmp-tex-file (concat tmp-file ".tex"))
 169          (lhs-file (concat base-name ".lhs"))
 170          (tex-file (concat base-name ".tex"))
 171          (command (concat org-babel-haskell-lhs2tex-command
 172                           " " (org-babel-process-file-name lhs-file)
 173                           " > " (org-babel-process-file-name tex-file)))
 174          (preserve-indentp org-src-preserve-indentation)
 175          indentation)
 176     ;; escape haskell source-code blocks
 177     (with-temp-file tmp-org-file
 178       (insert contents)
 179       (goto-char (point-min))
 180       (while (re-search-forward haskell-regexp nil t)
 181         (save-match-data (setq indentation (length (match-string 1))))
 182         (replace-match (save-match-data
 183                          (concat
 184                           "#+begin_latex\n\\begin{code}\n"
 185                           (if (or preserve-indentp
 186                                   (string-match "-i" (match-string 2)))
 187                               (match-string 3)
 188                             (org-remove-indentation (match-string 3)))
 189                           "\n\\end{code}\n#+end_latex\n"))
 190                        t t)
 191         (indent-code-rigidly (match-beginning 0) (match-end 0) indentation)))
 192     (save-excursion
 193       ;; export to latex w/org and save as .lhs
 194       (find-file tmp-org-file) (funcall 'org-export-as-latex nil)
 195       (kill-buffer)
 196       (delete-file tmp-org-file)
 197       (find-file tmp-tex-file)
 198       (goto-char (point-min)) (forward-line 2)
 199       (insert "%include polycode.fmt\n")
 200       ;; ensure all \begin/end{code} statements start at the first column
 201       (while (re-search-forward "^[ \t]+\\\\begin{code}[^\000]+\\\\end{code}" nil t)
 202         (replace-match (save-match-data (org-remove-indentation (match-string 0)))
 203                        t t))
 204       (setq contents (buffer-string))
 205       (save-buffer) (kill-buffer))
 206     (delete-file tmp-tex-file)
 207     ;; save org exported latex to a .lhs file
 208     (with-temp-file lhs-file (insert contents))
 209     (if (not arg)
 210         (find-file lhs-file)
 211       ;; process .lhs file with lhs2tex
 212       (message "running %s" command) (shell-command command) (find-file tex-file))))
 213
 214 (provide 'ob-haskell)
 215
 216 ;; arch-tag: b53f75f3-ba1a-4b05-82d9-a2a0d4e70804
 217
 218 ;;; ob-haskell.el ends here