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117 lines
4.1 KiB
EmacsLisp
117 lines
4.1 KiB
EmacsLisp
;;; ob-awk.el --- org-babel functions for awk evaluation
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;; Copyright (C) 2011 Free Software Foundation, Inc.
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;; Author: Eric Schulte
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;; Keywords: literate programming, reproducible research
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;; Homepage: http://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 <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Babel's awk can use special header argument:
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;;
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;; - :in-file takes a path to a file of data to be processed by awk
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;;
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;; - :stdin takes an Org-mode data or code block reference, the value
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;; of which will be passed to the awk process through STDIN
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;;; Code:
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(require 'ob)
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(require 'ob-eval)
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(eval-when-compile (require 'cl))
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(declare-function org-babel-ref-resolve "ob-ref" (ref))
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(declare-function orgtbl-to-generic "org-table" (table params))
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(defvar org-babel-tangle-lang-exts)
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(add-to-list 'org-babel-tangle-lang-exts '("awk" . "awk"))
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(defvar org-babel-awk-command "awk"
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"Name of the awk executable command.")
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(defun org-babel-expand-body:awk (body params &optional processed-params)
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"Expand BODY according to PARAMS, return the expanded body."
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(dolist (pair (mapcar #'cdr (org-babel-get-header params :var)))
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(setf body (replace-regexp-in-string
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(regexp-quote (format "$%s" (car pair))) (cdr pair) body)))
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body)
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(defun org-babel-execute:awk (body params)
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"Execute a block of Awk code with org-babel. This function is
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called by `org-babel-execute-src-block'"
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(message "executing Awk source code block")
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(let* ((result-params (cdr (assoc :result-params params)))
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(cmd-line (cdr (assoc :cmd-line params)))
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(in-file (cdr (assoc :in-file params)))
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(full-body (org-babel-expand-body:awk body params))
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(code-file ((lambda (file) (with-temp-file file (insert full-body)) file)
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(org-babel-temp-file "awk-")))
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(stdin ((lambda (stdin)
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(when stdin
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(let ((tmp (org-babel-temp-file "awk-stdin-"))
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(res (org-babel-ref-resolve stdin)))
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(with-temp-file tmp
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(insert (org-babel-awk-var-to-awk res)))
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tmp)))
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(cdr (assoc :stdin params))))
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(cmd (mapconcat #'identity (remove nil (list org-babel-awk-command
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"-f" code-file
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cmd-line
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in-file))
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" ")))
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(org-babel-reassemble-table
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((lambda (results)
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(when results
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(if (or (member "scalar" result-params)
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(member "verbatim" result-params)
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(member "output" result-params))
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results
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(let ((tmp (org-babel-temp-file "awk-results-")))
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(with-temp-file tmp (insert results))
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(org-babel-import-elisp-from-file tmp)))))
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(cond
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(stdin (with-temp-buffer
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(call-process-shell-command cmd stdin (current-buffer))
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(buffer-string)))
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(t (org-babel-eval cmd ""))))
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(org-babel-pick-name
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(cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
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(org-babel-pick-name
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(cdr (assoc :rowname-names params)) (cdr (assoc :rownames params))))))
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(defun org-babel-awk-var-to-awk (var &optional sep)
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"Return a printed value of VAR suitable for parsing with awk."
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(flet ((echo-var (v) (if (stringp v) v (format "%S" v))))
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(cond
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((and (listp var) (listp (car var)))
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(orgtbl-to-generic var (list :sep (or sep "\t") :fmt #'echo-var)))
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((listp var)
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(mapconcat #'echo-var var "\n"))
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(t (echo-var var)))))
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(defun org-babel-awk-table-or-string (results)
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"If the results look like a table, then convert them into an
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Emacs-lisp table, otherwise return the results as a string."
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(org-babel-script-escape results))
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(provide 'ob-awk)
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;;; ob-awk.el ends here
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