;;; ob-scheme.el --- Babel Functions for Scheme -*- lexical-binding: t; -*-
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;; Copyright (C) 2010-2018 Free Software Foundation, Inc.
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;; Authors: Eric Schulte
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;; Michael Gauland
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;; Keywords: literate programming, reproducible research, scheme
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;; Homepage: https://orgmode.org
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;; This file is part of GNU Emacs.
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;; GNU Emacs 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 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Now working with SBCL for both session and external evaluation.
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;;
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;; This certainly isn't optimally robust, but it seems to be working
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;; for the basic use cases.
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;;; Requirements:
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;; - a working scheme implementation
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;; (e.g. guile https://www.gnu.org/software/guile/guile.html)
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;;
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;; - for session based evaluation geiser is required, which is available from
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;; ELPA.
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;;; Code:
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(require 'ob)
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(require 'geiser nil t)
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(require 'geiser-impl nil t)
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(defvar geiser-repl--repl) ; Defined in geiser-repl.el
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(defvar geiser-impl--implementation) ; Defined in geiser-impl.el
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(defvar geiser-default-implementation) ; Defined in geiser-impl.el
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(defvar geiser-active-implementations) ; Defined in geiser-impl.el
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(defvar geiser-debug-show-debug-p) ; Defined in geiser-debug.el
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(defvar geiser-debug-jump-to-debug-p) ; Defined in geiser-debug.el
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(defvar geiser-repl-use-other-window) ; Defined in geiser-repl.el
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(defvar geiser-repl-window-allow-split) ; Defined in geiser-repl.el
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(declare-function run-geiser "ext:geiser-repl" (impl))
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(declare-function geiser-mode "ext:geiser-mode" ())
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(declare-function geiser-eval-region "ext:geiser-mode"
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(start end &optional and-go raw nomsg))
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(declare-function geiser-repl-exit "ext:geiser-repl" (&optional arg))
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(declare-function geiser-eval--retort-output "ext:geiser-eval" (ret))
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(declare-function geiser-eval--retort-result-str "ext:geiser-eval" (ret prefix))
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(defcustom org-babel-scheme-null-to 'hline
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"Replace `null' and empty lists in scheme tables with this before returning."
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:group 'org-babel
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:version "26.1"
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:package-version '(Org . "9.1")
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:type 'symbol)
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(defvar org-babel-default-header-args:scheme '()
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"Default header arguments for scheme code blocks.")
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(defun org-babel-expand-body:scheme (body params)
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"Expand BODY according to PARAMS, return the expanded body."
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(let ((vars (org-babel--get-vars params))
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(prepends (cdr (assq :prologue params))))
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(concat (and prepends (concat prepends "\n"))
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(if (null vars) body
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(format "(let (%s)\n%s\n)"
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(mapconcat
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(lambda (var)
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(format "%S" (print `(,(car var) ',(cdr var)))))
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vars
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"\n ")
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body)))))
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(defvar org-babel-scheme-repl-map (make-hash-table :test #'equal)
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"Map of scheme sessions to session names.")
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(defun org-babel-scheme-cleanse-repl-map ()
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"Remove dead buffers from the REPL map."
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(maphash
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(lambda (x y) (unless (buffer-name y) (remhash x org-babel-scheme-repl-map)))
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org-babel-scheme-repl-map))
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(defun org-babel-scheme-get-session-buffer (session-name)
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"Look up the scheme buffer for a session; return nil if it doesn't exist."
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(org-babel-scheme-cleanse-repl-map) ; Prune dead sessions
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(gethash session-name org-babel-scheme-repl-map))
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(defun org-babel-scheme-set-session-buffer (session-name buffer)
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"Record the scheme buffer used for a given session."
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(puthash session-name buffer org-babel-scheme-repl-map))
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(defun org-babel-scheme-get-buffer-impl (buffer)
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"Returns the scheme implementation geiser associates with the buffer."
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(with-current-buffer (set-buffer buffer)
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geiser-impl--implementation))
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(defun org-babel-scheme-get-repl (impl name)
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"Switch to a scheme REPL, creating it if it doesn't exist:"
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(let ((buffer (org-babel-scheme-get-session-buffer name)))
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(or buffer
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(progn
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(run-geiser impl)
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(if name
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(progn
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(rename-buffer name t)
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(org-babel-scheme-set-session-buffer name (current-buffer))))
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(current-buffer)))))
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(defun org-babel-scheme-make-session-name (buffer name impl)
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"Generate a name for the session buffer.
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For a named session, the buffer name will be the session name.
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If the session is unnamed (nil), generate a name.
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If the session is `none', use nil for the session name, and
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org-babel-scheme-execute-with-geiser will use a temporary session."
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(cond ((not name) (concat buffer " " (symbol-name impl) " REPL"))
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((string= name "none") nil)
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(name)))
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(defmacro org-babel-scheme-capture-current-message (&rest body)
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"Capture current message in both interactive and noninteractive mode"
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`(if noninteractive
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(let ((original-message (symbol-function 'message))
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(current-message nil))
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(unwind-protect
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(progn
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(defun message (&rest args)
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(setq current-message (apply original-message args)))
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,@body
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current-message)
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(fset 'message original-message)))
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(progn
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,@body
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(current-message))))
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(defun org-babel-scheme-execute-with-geiser (code output impl repl)
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"Execute code in specified REPL. If the REPL doesn't exist, create it
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using the given scheme implementation.
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Returns the output of executing the code if the output parameter
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is true; otherwise returns the last value."
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(let ((result nil))
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(with-temp-buffer
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(insert (format ";; -*- geiser-scheme-implementation: %s -*-" impl))
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(newline)
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(insert code)
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(geiser-mode)
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(let ((geiser-repl-window-allow-split nil)
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(geiser-repl-use-other-window nil))
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(let ((repl-buffer (save-current-buffer
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(org-babel-scheme-get-repl impl repl))))
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(when (not (eq impl (org-babel-scheme-get-buffer-impl
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(current-buffer))))
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(message "Implementation mismatch: %s (%s) %s (%s)" impl (symbolp impl)
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(org-babel-scheme-get-buffer-impl (current-buffer))
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(symbolp (org-babel-scheme-get-buffer-impl
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(current-buffer)))))
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(setq geiser-repl--repl repl-buffer)
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(setq geiser-impl--implementation nil)
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(let ((geiser-debug-jump-to-debug-p nil)
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(geiser-debug-show-debug-p nil))
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(let ((ret (geiser-eval-region (point-min) (point-max))))
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(setq result (if output
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(geiser-eval--retort-output ret)
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(geiser-eval--retort-result-str ret "")))))
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(when (not repl)
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(save-current-buffer (set-buffer repl-buffer)
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(geiser-repl-exit))
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(set-process-query-on-exit-flag (get-buffer-process repl-buffer) nil)
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(kill-buffer repl-buffer)))))
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result))
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(defun org-babel-scheme--table-or-string (results)
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"Convert RESULTS into an appropriate elisp value.
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If the results look like a list or tuple, then convert them into an
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Emacs-lisp table, otherwise return the results as a string."
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(let ((res (org-babel-script-escape results)))
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(cond ((listp res)
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(mapcar (lambda (el)
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(if (or (null el) (eq el 'null))
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org-babel-scheme-null-to
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el))
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res))
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(t res))))
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(defun org-babel-execute:scheme (body params)
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"Execute a block of Scheme code with org-babel.
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This function is called by `org-babel-execute-src-block'"
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(let* ((source-buffer (current-buffer))
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(source-buffer-name (replace-regexp-in-string ;; zap surrounding *
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"^ ?\\*\\([^*]+\\)\\*" "\\1"
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(buffer-name source-buffer))))
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(save-excursion
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(let* ((result-type (cdr (assq :result-type params)))
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(impl (or (when (cdr (assq :scheme params))
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(intern (cdr (assq :scheme params))))
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geiser-default-implementation
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(car geiser-active-implementations)))
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(session (org-babel-scheme-make-session-name
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source-buffer-name (cdr (assq :session params)) impl))
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(full-body (org-babel-expand-body:scheme body params))
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(result
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(org-babel-scheme-execute-with-geiser
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full-body ; code
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(string= result-type "output") ; output?
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impl ; implementation
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(and (not (string= session "none")) session)))) ; session
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(let ((table
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(org-babel-reassemble-table
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result
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(org-babel-pick-name (cdr (assq :colname-names params))
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(cdr (assq :colnames params)))
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(org-babel-pick-name (cdr (assq :rowname-names params))
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(cdr (assq :rownames params))))))
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(org-babel-scheme--table-or-string table))))))
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(provide 'ob-scheme)
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;;; ob-scheme.el ends here
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