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;;; ob-awk.el --- Babel Functions for Awk -*- lexical-binding: t; -*-
;; Copyright (C) 2011-2021 Free Software Foundation, Inc.
;; Author: Eric Schulte
;; Maintainer: Tyler Smith <tyler@plantarum.ca>
;; Keywords: literate programming, reproducible research
;; Homepage: https://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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Babel's awk can use special header argument:
;;
;; - :in-file takes a path to a file of data to be processed by awk
;;
;; - :stdin takes an Org data or code block reference, the value of
;; which will be passed to the awk process through STDIN
;;; Code:
(require 'ob)
(require 'org-compat)
(declare-function org-babel-ref-resolve "ob-ref" (ref))
(declare-function orgtbl-to-generic "org-table" (table params))
(defvar org-babel-tangle-lang-exts)
(add-to-list 'org-babel-tangle-lang-exts '("awk" . "awk"))
(defvar org-babel-awk-command "awk"
"Name of the awk executable command.")
(defun org-babel-expand-body:awk (body _params)
"Expand BODY according to PARAMS, return the expanded body."
body)
(defun org-babel-execute:awk (body params)
"Execute a block of Awk code with org-babel.
This function is called by `org-babel-execute-src-block'."
(message "executing Awk source code block")
(let* ((result-params (cdr (assq :result-params params)))
(cmd-line (cdr (assq :cmd-line params)))
(in-file (cdr (assq :in-file params)))
(full-body (org-babel-expand-body:awk body params))
(code-file (let ((file (org-babel-temp-file "awk-")))
(with-temp-file file (insert full-body)) file))
(stdin (let ((stdin (cdr (assq :stdin params))))
(when stdin
(let ((tmp (org-babel-temp-file "awk-stdin-"))
(res (org-babel-ref-resolve stdin)))
(with-temp-file tmp
(insert (org-babel-awk-var-to-awk res)))
tmp))))
(cmd (mapconcat #'identity
(append
(list org-babel-awk-command
"-f" code-file cmd-line)
(mapcar (lambda (pair)
(format "-v %s='%s'"
(car pair)
(org-babel-awk-var-to-awk
(cdr pair))))
(org-babel--get-vars params))
(list in-file))
" ")))
(org-babel-reassemble-table
(let ((results
(cond
(stdin (with-temp-buffer
(call-process-shell-command cmd stdin (current-buffer))
(buffer-string)))
(t (org-babel-eval cmd "")))))
(when results
(org-babel-result-cond result-params
results
(let ((tmp (org-babel-temp-file "awk-results-")))
(with-temp-file tmp (insert results))
(org-babel-import-elisp-from-file tmp)))))
(org-babel-pick-name
(cdr (assq :colname-names params)) (cdr (assq :colnames params)))
(org-babel-pick-name
(cdr (assq :rowname-names params)) (cdr (assq :rownames params))))))
(defun org-babel-awk-var-to-awk (var &optional sep)
"Return a printed value of VAR suitable for parsing with awk."
(let ((echo-var (lambda (v) (if (stringp v) v (format "%S" v)))))
(cond
((and (listp var) (listp (car var)))
(orgtbl-to-generic var (list :sep (or sep "\t") :fmt echo-var)))
((listp var)
(mapconcat echo-var var "\n"))
(t (funcall echo-var var)))))
(provide 'ob-awk)
;;; ob-awk.el ends here
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