ox: Fix small bug
[org-mode/org-tableheadings.git] / lisp / ob-awk.el
blob373d5fd9877895ed323e8063b89a62436749ce65
1 ;;; ob-awk.el --- org-babel functions for awk evaluation
3 ;; Copyright (C) 2011-2013 Free Software Foundation, Inc.
5 ;; Author: Eric Schulte
6 ;; Keywords: literate programming, reproducible research
7 ;; Homepage: http://orgmode.org
9 ;; This file is part of GNU Emacs.
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.
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.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
24 ;;; Commentary:
26 ;; Babel's awk can use special header argument:
28 ;; - :in-file takes a path to a file of data to be processed by awk
30 ;; - :stdin takes an Org-mode data or code block reference, the value
31 ;; of which will be passed to the awk process through STDIN
33 ;;; Code:
34 (require 'ob)
35 (require 'org-compat)
36 (eval-when-compile (require 'cl))
38 (declare-function org-babel-ref-resolve "ob-ref" (ref))
39 (declare-function orgtbl-to-generic "org-table" (table params))
41 (defvar org-babel-tangle-lang-exts)
42 (add-to-list 'org-babel-tangle-lang-exts '("awk" . "awk"))
44 (defvar org-babel-awk-command "awk"
45 "Name of the awk executable command.")
47 (defun org-babel-expand-body:awk (body params)
48 "Expand BODY according to PARAMS, return the expanded body."
49 (dolist (pair (mapcar #'cdr (org-babel-get-header params :var)))
50 (setf body (replace-regexp-in-string
51 (regexp-quote (format "$%s" (car pair))) (cdr pair) body)))
52 body)
54 (defun org-babel-execute:awk (body params)
55 "Execute a block of Awk code with org-babel. This function is
56 called by `org-babel-execute-src-block'"
57 (message "executing Awk source code block")
58 (let* ((result-params (cdr (assoc :result-params params)))
59 (cmd-line (cdr (assoc :cmd-line params)))
60 (in-file (cdr (assoc :in-file params)))
61 (full-body (org-babel-expand-body:awk body params))
62 (code-file ((lambda (file) (with-temp-file file (insert full-body)) file)
63 (org-babel-temp-file "awk-")))
64 (stdin ((lambda (stdin)
65 (when stdin
66 (let ((tmp (org-babel-temp-file "awk-stdin-"))
67 (res (org-babel-ref-resolve stdin)))
68 (with-temp-file tmp
69 (insert (org-babel-awk-var-to-awk res)))
70 tmp)))
71 (cdr (assoc :stdin params))))
72 (cmd (mapconcat #'identity (remove nil (list org-babel-awk-command
73 "-f" code-file
74 cmd-line
75 in-file))
76 " ")))
77 (org-babel-reassemble-table
78 ((lambda (results)
79 (when results
80 (org-babel-result-cond result-params
81 results
82 (let ((tmp (org-babel-temp-file "awk-results-")))
83 (with-temp-file tmp (insert results))
84 (org-babel-import-elisp-from-file tmp)))))
85 (cond
86 (stdin (with-temp-buffer
87 (call-process-shell-command cmd stdin (current-buffer))
88 (buffer-string)))
89 (t (org-babel-eval cmd ""))))
90 (org-babel-pick-name
91 (cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
92 (org-babel-pick-name
93 (cdr (assoc :rowname-names params)) (cdr (assoc :rownames params))))))
95 (defun org-babel-awk-var-to-awk (var &optional sep)
96 "Return a printed value of VAR suitable for parsing with awk."
97 (let ((echo-var (lambda (v) (if (stringp v) v (format "%S" v)))))
98 (cond
99 ((and (listp var) (listp (car var)))
100 (orgtbl-to-generic var (list :sep (or sep "\t") :fmt echo-var)))
101 ((listp var)
102 (mapconcat echo-var var "\n"))
103 (t (funcall echo-var var)))))
105 (defun org-babel-awk-table-or-string (results)
106 "If the results look like a table, then convert them into an
107 Emacs-lisp table, otherwise return the results as a string."
108 (org-babel-script-escape results))
110 (provide 'ob-awk)
114 ;;; ob-awk.el ends here