lisp/ob-sed.el

   1 ;;; ob-sed.el --- Babel Functions for Sed Scripts    -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2015-2017 Free Software Foundation, Inc.
   4
   5 ;; Author: Bjarte Johansen
   6 ;; Keywords: literate programming, reproducible research
   7 ;; Version: 0.1.0
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Provides a way to evaluate sed scripts in Org mode.
  27
  28 ;;; Usage:
  29
  30 ;; Add to your Emacs config:
  31
  32 ;; (org-babel-do-load-languages
  33 ;;  'org-babel-load-languages
  34 ;;  '((sed . t)))
  35
  36 ;; In addition to the normal header arguments, ob-sed also provides
  37 ;; :cmd-line and :in-file. :cmd-line allows one to pass other flags to
  38 ;; the sed command like the "--in-place" flag which makes sed edit the
  39 ;; file pass to it instead of outputting to standard out or to a
  40 ;; different file. :in-file is a header arguments that allows one to
  41 ;; tell Org Babel which file the sed script to act on.
  42
  43 ;;; Code:
  44 (require 'ob)
  45
  46 (defvar org-babel-sed-command "sed"
  47   "Name of the sed executable command.")
  48
  49 (defvar org-babel-tangle-lang-exts)
  50 (add-to-list 'org-babel-tangle-lang-exts '("sed" . "sed"))
  51
  52 (defconst org-babel-header-args:sed
  53   '((:cmd-line . :any)
  54     (:in-file  . :any))
  55   "Sed specific header arguments.")
  56
  57 (defvar org-babel-default-header-args:sed '()
  58   "Default arguments for evaluating a sed source block.")
  59
  60 (defun org-babel-execute:sed (body params)
  61   "Execute a block of sed code with Org Babel.
  62 BODY is the source inside a sed source block and PARAMS is an
  63 association list over the source block configurations.  This
  64 function is called by `org-babel-execute-src-block'."
  65   (message "executing sed source code block")
  66   (let* ((result-params (cdr (assq :result-params params)))
  67          (cmd-line (cdr (assq :cmd-line params)))
  68          (in-file (cdr (assq :in-file params)))
  69          (code-file (let ((file (org-babel-temp-file "sed-")))
  70                       (with-temp-file file
  71                         (insert body)) file))
  72          (stdin (let ((stdin (cdr (assq :stdin params))))
  73                    (when stdin
  74                      (let ((tmp (org-babel-temp-file "sed-stdin-"))
  75                            (res (org-babel-ref-resolve stdin)))
  76                        (with-temp-file tmp
  77                          (insert res))
  78                        tmp))))
  79          (cmd (mapconcat #'identity
  80                          (remq nil
  81                                (list org-babel-sed-command
  82                                      (format "--file=\"%s\"" code-file)
  83                                      cmd-line
  84                                      in-file))
  85                          " ")))
  86     (org-babel-reassemble-table
  87      (let ((results
  88             (cond
  89              (stdin (with-temp-buffer
  90                       (call-process-shell-command cmd stdin (current-buffer))
  91                       (buffer-string)))
  92              (t (org-babel-eval cmd "")))))
  93        (when results
  94          (org-babel-result-cond result-params
  95            results
  96            (let ((tmp (org-babel-temp-file "sed-results-")))
  97              (with-temp-file tmp (insert results))
  98              (org-babel-import-elisp-from-file tmp)))))
  99      (org-babel-pick-name
 100       (cdr (assq :colname-names params)) (cdr (assq :colnames params)))
 101      (org-babel-pick-name
 102       (cdr (assq :rowname-names params)) (cdr (assq :rownames params))))))
 103
 104 (provide 'ob-sed)
 105 ;;; ob-sed.el ends here