;;; ob-picolisp.el --- Babel Functions for Picolisp -*- lexical-binding: t; -*-
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;; Copyright (C) 2010-2018 Free Software Foundation, Inc.
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;; Authors: Thorsten Jolitz
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;; Eric Schulte
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;; Keywords: literate programming, reproducible research
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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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;; This library enables the use of PicoLisp in the multi-language
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;; programming framework Org-Babel. PicoLisp is a minimal yet
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;; fascinating lisp dialect and a highly productive application
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;; framework for web-based client-server applications on top of
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;; object-oriented databases. A good way to learn PicoLisp is to first
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;; read Paul Grahams essay "The hundred year language"
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;; (http://www.paulgraham.com/hundred.html) and then study the various
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;; documents and essays published in the PicoLisp wiki
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;; (http://picolisp.com/5000/-2.html). PicoLisp is included in some
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;; GNU/Linux Distributions, and can be downloaded here:
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;; http://software-lab.de/down.html. It ships with a picolisp-mode and
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;; an inferior-picolisp-mode for Emacs (to be found in the /lib/el/
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;; directory).
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;; Although it might seem more natural to use Emacs Lisp for most
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;; Lisp-based programming tasks inside Org, an Emacs library written
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;; in Emacs Lisp, PicoLisp has at least two outstanding features that
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;; make it a valuable addition to Org Babel:
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;; PicoLisp _is_ an object-oriented database with a Prolog-based query
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;; language implemented in PicoLisp (Pilog). Database objects are
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;; first-class members of the language.
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;; PicoLisp is an extremely productive framework for the development
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;; of interactive web-applications (on top of a database).
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;;; Requirements:
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;;; Code:
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(require 'ob)
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(require 'comint)
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(declare-function run-picolisp "ext:inferior-picolisp" (cmd))
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(defvar org-babel-tangle-lang-exts) ;; Autoloaded
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;; optionally define a file extension for this language
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(add-to-list 'org-babel-tangle-lang-exts '("picolisp" . "l"))
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;;; interferes with settings in org-babel buffer?
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;; optionally declare default header arguments for this language
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;; (defvar org-babel-default-header-args:picolisp
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;; '((:colnames . "no"))
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;; "Default arguments for evaluating a picolisp source block.")
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(defvar org-babel-picolisp-eoe "org-babel-picolisp-eoe"
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"String to indicate that evaluation has completed.")
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(defcustom org-babel-picolisp-cmd "pil"
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"Name of command used to evaluate picolisp blocks."
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:group 'org-babel
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:version "24.1"
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:type 'string)
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(defun org-babel-expand-body:picolisp (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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(print-level nil)
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(print-length nil))
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(if (> (length vars) 0)
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(concat "(prog (let ("
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(mapconcat
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(lambda (var)
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(format "%S '%S)"
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(print (car var))
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(print (cdr var))))
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vars "\n ")
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" \n" body ") )")
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body)))
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(defun org-babel-execute:picolisp (body params)
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"Execute a block of Picolisp code with org-babel. This function is
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called by `org-babel-execute-src-block'"
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(message "executing Picolisp source code block")
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(let* (
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;; Name of the session or "none".
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(session-name (cdr (assq :session params)))
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;; Set the session if the session variable is non-nil.
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(session (org-babel-picolisp-initiate-session session-name))
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;; Either OUTPUT or VALUE which should behave as described above.
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(result-params (cdr (assq :result-params params)))
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;; Expand the body with `org-babel-expand-body:picolisp'.
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(full-body (org-babel-expand-body:picolisp body params))
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;; Wrap body appropriately for the type of evaluation and results.
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(wrapped-body
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(cond
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((or (member "code" result-params)
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(member "pp" result-params))
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(format "(pretty (out \"/dev/null\" %s))" full-body))
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((and (member "value" result-params) (not session))
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(format "(print (out \"/dev/null\" %s))" full-body))
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((member "value" result-params)
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(format "(out \"/dev/null\" %s)" full-body))
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(t full-body)))
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(result
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(if (not (string= session-name "none"))
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;; Session based evaluation.
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(mapconcat ;; <- joins the list back into a single string
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#'identity
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(butlast ;; <- remove the org-babel-picolisp-eoe line
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(delq nil
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(mapcar
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(lambda (line)
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(org-babel-chomp ;; Remove trailing newlines.
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(when (> (length line) 0) ;; Remove empty lines.
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(cond
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;; Remove leading "-> " from return values.
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((and (>= (length line) 3)
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(string= "-> " (substring line 0 3)))
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(substring line 3))
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;; Remove trailing "-> <<return-value>>" on the
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;; last line of output.
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((and (member "output" result-params)
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(string-match-p "->" line))
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(substring line 0 (string-match "->" line)))
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(t line)
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)
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;;(if (and (>= (length line) 3);Remove leading "<-"
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;; (string= "-> " (substring line 0 3)))
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;; (substring line 3)
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;; line)
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)))
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;; Returns a list of the output of each evaluated exp.
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(org-babel-comint-with-output
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(session org-babel-picolisp-eoe)
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(insert wrapped-body) (comint-send-input)
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(insert "'" org-babel-picolisp-eoe)
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(comint-send-input)))))
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"\n")
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;; external evaluation
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(let ((script-file (org-babel-temp-file "picolisp-script-")))
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(with-temp-file script-file
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(insert (concat wrapped-body "(bye)")))
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(org-babel-eval
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(format "%s %s"
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org-babel-picolisp-cmd
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(org-babel-process-file-name script-file))
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"")))))
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(org-babel-result-cond result-params
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result
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(read result))))
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(defun org-babel-picolisp-initiate-session (&optional session-name)
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"If there is not a current inferior-process-buffer in SESSION
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then create. Return the initialized session."
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(unless (string= session-name "none")
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(require 'inferior-picolisp)
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;; provide a reasonable default session name
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(let ((session (or session-name "*inferior-picolisp*")))
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;; check if we already have a live session by this name
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(if (org-babel-comint-buffer-livep session)
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(get-buffer session)
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(save-window-excursion
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(run-picolisp org-babel-picolisp-cmd)
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(rename-buffer session-name)
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(current-buffer))))))
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(provide 'ob-picolisp)
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;;; ob-picolisp.el ends here
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