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;;; org-macro.el --- Macro Replacement Code for Org Mode
;; Copyright (C) 2013-2014 Free Software Foundation, Inc.
;; Author: Nicolas Goaziou <n.goaziou@gmail.com>
;; Keywords: outlines, hypermedia, calendar, wp
;; 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Macros are expanded with `org-macro-replace-all', which relies
;; internally on `org-macro-expand'.
;; Default templates for expansion are stored in the buffer-local
;; variable `org-macro-templates'. This variable is updated by
;; `org-macro-initialize-templates', which recursively calls
;; `org-macro--collect-macros' in order to read setup files.
;; Along with macros defined through #+MACRO: keyword, default
;; templates include the following hard-coded macros:
;; {{{time(format-string)}}}, {{{property(node-property)}}},
;; {{{input-file}}} and {{{modification-time(format-string)}}}.
;; Upon exporting, "ox.el" will also provide {{{author}}}, {{{date}}},
;; {{{email}}} and {{{title}}} macros.
;;; Code:
(require 'org-macs)
(declare-function org-element-at-point "org-element" (&optional keep-trail))
(declare-function org-element-context "org-element" (&optional element))
(declare-function org-element-property "org-element" (property element))
(declare-function org-element-type "org-element" (element))
(declare-function org-remove-double-quotes "org" (s))
(declare-function org-mode "org" ())
(declare-function org-file-contents "org" (file &optional noerror))
(declare-function org-with-wide-buffer "org-macs" (&rest body))
;;; Variables
(defvar org-macro-templates nil
"Alist containing all macro templates in current buffer.
Associations are in the shape of (NAME . TEMPLATE) where NAME
stands for macro's name and template for its replacement value,
both as strings. This is an internal variable. Do not set it
directly, use instead:
#+MACRO: name template")
(make-variable-buffer-local 'org-macro-templates)
;;; Functions
(defun org-macro--collect-macros ()
"Collect macro definitions in current buffer and setup files.
Return an alist containing all macro templates found."
(let* (collect-macros ; For byte-compiler.
(collect-macros
(lambda (files templates)
;; Return an alist of macro templates. FILES is a list of
;; setup files names read so far, used to avoid circular
;; dependencies. TEMPLATES is the alist collected so far.
(let ((case-fold-search t))
(org-with-wide-buffer
(goto-char (point-min))
(while (re-search-forward
"^[ \t]*#\\+\\(MACRO\\|SETUPFILE\\):" nil t)
(let ((element (org-element-at-point)))
(when (eq (org-element-type element) 'keyword)
(let ((val (org-element-property :value element)))
(if (equal (org-element-property :key element) "MACRO")
;; Install macro in TEMPLATES.
(when (string-match
"^\\(.*?\\)\\(?:\\s-+\\(.*\\)\\)?\\s-*$" val)
(let* ((name (match-string 1 val))
(template (or (match-string 2 val) ""))
(old-cell (assoc name templates)))
(if old-cell (setcdr old-cell template)
(push (cons name template) templates))))
;; Enter setup file.
(let ((file (expand-file-name
(org-remove-double-quotes val))))
(unless (member file files)
(with-temp-buffer
(org-mode)
(insert (org-file-contents file 'noerror))
(setq templates
(funcall collect-macros (cons file files)
templates)))))))))))
templates))))
(funcall collect-macros nil nil)))
(defun org-macro-initialize-templates ()
"Collect macro templates defined in current buffer.
Templates are stored in buffer-local variable
`org-macro-templates'. In addition to buffer-defined macros, the
function installs the following ones: \"property\",
\"time\". and, if the buffer is associated to a file,
\"input-file\" and \"modification-time\"."
(let* ((templates (org-macro--collect-macros))
(update-templates
(lambda (cell)
(let ((old-template (assoc (car cell) templates)))
(if old-template (setcdr old-template (cdr cell))
(push cell templates))))))
;; Install hard-coded macros.
(mapc (lambda (cell) (funcall update-templates cell))
(list (cons "property" "(eval (org-entry-get nil \"$1\" 'selective))")
(cons "time" "(eval (format-time-string \"$1\"))")))
(let ((visited-file (buffer-file-name (buffer-base-buffer))))
(when (and visited-file (file-exists-p visited-file))
(mapc (lambda (cell) (funcall update-templates cell))
(list (cons "input-file" (file-name-nondirectory visited-file))
(cons "modification-time"
(format "(eval (format-time-string \"$1\" '%s))"
(prin1-to-string
(nth 5 (file-attributes visited-file)))))))))
(setq org-macro-templates templates)))
(defun org-macro-expand (macro templates)
"Return expanded MACRO, as a string.
MACRO is an object, obtained, for example, with
`org-element-context'. TEMPLATES is an alist of templates used
for expansion. See `org-macro-templates' for a buffer-local
default value. Return nil if no template was found."
(let ((template
;; Macro names are case-insensitive.
(cdr (assoc-string (org-element-property :key macro) templates t))))
(when template
(let ((value (replace-regexp-in-string
"\\$[0-9]+"
(lambda (arg)
(or (nth (1- (string-to-number (substring arg 1)))
(org-element-property :args macro))
;; No argument: remove place-holder.
""))
template nil 'literal)))
;; VALUE starts with "(eval": it is a s-exp, `eval' it.
(when (string-match "\\`(eval\\>" value)
(setq value (eval (read value))))
;; Return string.
(format "%s" (or value ""))))))
(defun org-macro-replace-all (templates)
"Replace all macros in current buffer by their expansion.
TEMPLATES is an alist of templates used for expansion. See
`org-macro-templates' for a buffer-local default value."
(save-excursion
(goto-char (point-min))
(let (record)
(while (re-search-forward "{{{[-A-Za-z0-9_]" nil t)
(let ((object (org-element-context)))
(when (eq (org-element-type object) 'macro)
(let* ((value (org-macro-expand object templates))
(begin (org-element-property :begin object))
(signature (list begin
object
(org-element-property :args object))))
;; Avoid circular dependencies by checking if the same
;; macro with the same arguments is expanded at the same
;; position twice.
(if (member signature record)
(error "Circular macro expansion: %s"
(org-element-property :key object))
(when value
(push signature record)
(delete-region
begin
;; Preserve white spaces after the macro.
(progn (goto-char (org-element-property :end object))
(skip-chars-backward " \t")
(point)))
;; Leave point before replacement in case of recursive
;; expansions.
(save-excursion (insert value)))))))))))
(provide 'org-macro)
;;; org-macro.el ends here
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