;;; ob-haskell.el --- Babel Functions for Haskell -*- lexical-binding: t; -*- ;; Copyright (C) 2009-2016 Free Software Foundation, Inc. ;; Author: Eric Schulte ;; Keywords: literate programming, reproducible research ;; Homepage: http://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 . ;;; 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\"") (defun org-babel-execute:haskell (body params) "Execute a block of Haskell code." (let* ((session (cdr (assoc :session params))) (result-type (cdr (assoc :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)) (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-haskell-read-string (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 (assoc :result-params params)) result (org-babel-script-escape result))) (org-babel-pick-name (cdr (assoc :colname-names params)) (cdr (assoc :colname-names params))) (org-babel-pick-name (cdr (assoc :rowname-names params)) (cdr (assoc :rowname-names params)))))) (defun org-babel-haskell-read-string (string) "Strip \\\"s from around a haskell string." (if (string-match "^\"\\([^\000]+\\)\"$" string) (match-string 1 string) string)) (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-mode 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