;;; org-macro.el --- Macro Replacement Code for Org -*- lexical-binding: t; -*-
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;; Copyright (C) 2013-2018 Free Software Foundation, Inc.
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;; Author: Nicolas Goaziou <n.goaziou@gmail.com>
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;; Keywords: outlines, hypermedia, calendar, wp
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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 <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Macros are expanded with `org-macro-replace-all', which relies
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;; internally on `org-macro-expand'.
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;; Default templates for expansion are stored in the buffer-local
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;; variable `org-macro-templates'. This variable is updated by
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;; `org-macro-initialize-templates', which recursively calls
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;; `org-macro--collect-macros' in order to read setup files.
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;; Argument in macros are separated with commas. Proper escaping rules
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;; are implemented in `org-macro-escape-arguments' and arguments can
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;; be extracted from a string with `org-macro-extract-arguments'.
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;; Along with macros defined through #+MACRO: keyword, default
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;; templates include the following hard-coded macros:
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;; {{{time(format-string)}}},
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;; {{{property(node-property)}}},
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;; {{{input-file}}},
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;; {{{modification-time(format-string)}}},
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;; {{{n(counter,action}}}.
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;; Upon exporting, "ox.el" will also provide {{{author}}}, {{{date}}},
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;; {{{email}}} and {{{title}}} macros.
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;;; Code:
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(require 'cl-lib)
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(require 'org-macs)
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(require 'org-compat)
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(declare-function org-element-at-point "org-element" ())
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(declare-function org-element-context "org-element" (&optional element))
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(declare-function org-element-macro-parser "org-element" ())
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(declare-function org-element-property "org-element" (property element))
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(declare-function org-element-type "org-element" (element))
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(declare-function org-file-contents "org" (file &optional noerror nocache))
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(declare-function org-file-url-p "org" (file))
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(declare-function org-in-commented-heading-p "org" (&optional no-inheritance))
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(declare-function org-mode "org" ())
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(declare-function org-trim "org" (s &optional keep-lead))
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(declare-function vc-backend "vc-hooks" (f))
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(declare-function vc-call "vc-hooks" (fun file &rest args) t)
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(declare-function vc-exec-after "vc-dispatcher" (code))
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;;; Variables
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(defvar-local org-macro-templates nil
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"Alist containing all macro templates in current buffer.
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Associations are in the shape of (NAME . TEMPLATE) where NAME
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stands for macro's name and template for its replacement value,
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both as strings. This is an internal variable. Do not set it
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directly, use instead:
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#+MACRO: name template")
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;;; Functions
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(defun org-macro--collect-macros ()
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"Collect macro definitions in current buffer and setup files.
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Return an alist containing all macro templates found."
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(letrec ((collect-macros
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(lambda (files templates)
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;; Return an alist of macro templates. FILES is a list
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;; of setup files names read so far, used to avoid
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;; circular dependencies. TEMPLATES is the alist
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;; collected so far.
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(let ((case-fold-search t))
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(org-with-wide-buffer
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(goto-char (point-min))
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(while (re-search-forward
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"^[ \t]*#\\+\\(MACRO\\|SETUPFILE\\):" nil t)
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(let ((element (org-element-at-point)))
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(when (eq (org-element-type element) 'keyword)
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(let ((val (org-element-property :value element)))
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(if (equal (org-element-property :key element) "MACRO")
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;; Install macro in TEMPLATES.
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(when (string-match
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"^\\(.*?\\)\\(?:\\s-+\\(.*\\)\\)?\\s-*$" val)
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(let* ((name (match-string 1 val))
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(template (or (match-string 2 val) ""))
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(old-cell (assoc name templates)))
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(if old-cell (setcdr old-cell template)
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(push (cons name template) templates))))
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;; Enter setup file.
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(let* ((uri (org-unbracket-string "\"" "\"" (org-trim val)))
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(uri-is-url (org-file-url-p uri))
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(uri (if uri-is-url
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uri
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(expand-file-name uri))))
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;; Avoid circular dependencies.
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(unless (member uri files)
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(with-temp-buffer
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(unless uri-is-url
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(setq default-directory
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(file-name-directory uri)))
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(org-mode)
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(insert (org-file-contents uri 'noerror))
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(setq templates
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(funcall collect-macros (cons uri files)
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templates)))))))))))
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templates))))
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(funcall collect-macros nil nil)))
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(defun org-macro-initialize-templates ()
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"Collect macro templates defined in current buffer.
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Templates are stored in buffer-local variable
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`org-macro-templates'. In addition to buffer-defined macros, the
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function installs the following ones: \"property\",
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\"time\". and, if the buffer is associated to a file,
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\"input-file\" and \"modification-time\"."
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(let* ((templates nil)
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(update-templates
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(lambda (cell)
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(let ((old-template (assoc (car cell) templates)))
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(if old-template (setcdr old-template (cdr cell))
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(push cell templates))))))
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;; Install "property", "time" macros.
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(mapc update-templates
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(list (cons "property"
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"(eval (save-excursion
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(let ((l \"$2\"))
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(when (org-string-nw-p l)
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(condition-case _
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(let ((org-link-search-must-match-exact-headline t))
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(org-link-search l nil t))
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(error
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(error \"Macro property failed: cannot find location %s\"
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l)))))
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(org-entry-get nil \"$1\" 'selective)))")
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(cons "time" "(eval (format-time-string \"$1\"))")))
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;; Install "input-file", "modification-time" macros.
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(let ((visited-file (buffer-file-name (buffer-base-buffer))))
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(when (and visited-file (file-exists-p visited-file))
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(mapc update-templates
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(list (cons "input-file" (file-name-nondirectory visited-file))
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(cons "modification-time"
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(format "(eval (format-time-string \"$1\" (or (and (org-string-nw-p \"$2\") (org-macro--vc-modified-time %s)) '%s)))"
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(prin1-to-string visited-file)
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(prin1-to-string
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(nth 5 (file-attributes visited-file)))))))))
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;; Initialize and install "n" macro.
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(org-macro--counter-initialize)
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(funcall update-templates
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(cons "n" "(eval (org-macro--counter-increment \"$1\" \"$2\"))"))
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(setq org-macro-templates (nconc (org-macro--collect-macros) templates))))
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(defun org-macro-expand (macro templates)
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"Return expanded MACRO, as a string.
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MACRO is an object, obtained, for example, with
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`org-element-context'. TEMPLATES is an alist of templates used
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for expansion. See `org-macro-templates' for a buffer-local
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default value. Return nil if no template was found."
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(let ((template
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;; Macro names are case-insensitive.
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(cdr (assoc-string (org-element-property :key macro) templates t))))
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(when template
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(let ((value (replace-regexp-in-string
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"\\$[0-9]+"
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(lambda (arg)
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(or (nth (1- (string-to-number (substring arg 1)))
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(org-element-property :args macro))
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;; No argument: remove place-holder.
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""))
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template nil 'literal)))
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;; VALUE starts with "(eval": it is a s-exp, `eval' it.
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(when (string-match "\\`(eval\\>" value)
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(setq value (eval (read value))))
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;; Return string.
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(format "%s" (or value ""))))))
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(defun org-macro-replace-all (templates &optional finalize keywords)
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"Replace all macros in current buffer by their expansion.
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TEMPLATES is an alist of templates used for expansion. See
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`org-macro-templates' for a buffer-local default value.
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If optional arg FINALIZE is non-nil, raise an error if a macro is
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found in the buffer with no definition in TEMPLATES.
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Optional argument KEYWORDS, when non-nil is a list of keywords,
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as strings, where macro expansion is allowed."
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(org-with-wide-buffer
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(goto-char (point-min))
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(let ((properties-regexp (format "\\`EXPORT_%s\\+?\\'"
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(regexp-opt keywords)))
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record)
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(while (re-search-forward "{{{[-A-Za-z0-9_]" nil t)
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(unless (save-match-data (org-in-commented-heading-p))
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(let* ((datum (save-match-data (org-element-context)))
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(type (org-element-type datum))
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(macro
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(cond
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((eq type 'macro) datum)
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;; In parsed keywords and associated node
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;; properties, force macro recognition.
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((or (and (eq type 'keyword)
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(member (org-element-property :key datum) keywords))
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(and (eq type 'node-property)
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(string-match-p properties-regexp
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(org-element-property :key datum))))
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(save-excursion
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(goto-char (match-beginning 0))
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(org-element-macro-parser))))))
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(when macro
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(let* ((value (org-macro-expand macro templates))
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(begin (org-element-property :begin macro))
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(signature (list begin
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macro
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(org-element-property :args macro))))
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;; Avoid circular dependencies by checking if the same
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;; macro with the same arguments is expanded at the
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;; same position twice.
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(cond ((member signature record)
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(error "Circular macro expansion: %s"
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(org-element-property :key macro)))
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(value
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(push signature record)
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(delete-region
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begin
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;; Preserve white spaces after the macro.
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(progn (goto-char (org-element-property :end macro))
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(skip-chars-backward " \t")
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(point)))
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;; Leave point before replacement in case of
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;; recursive expansions.
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(save-excursion (insert value)))
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(finalize
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(error "Undefined Org macro: %s; aborting"
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(org-element-property :key macro))))))))))))
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(defun org-macro-escape-arguments (&rest args)
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"Build macro's arguments string from ARGS.
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ARGS are strings. Return value is a string with arguments
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properly escaped and separated with commas. This is the opposite
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of `org-macro-extract-arguments'."
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(let ((s ""))
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(dolist (arg (reverse args) (substring s 1))
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(setq s
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(concat
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","
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(replace-regexp-in-string
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"\\(\\\\*\\),"
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(lambda (m)
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(concat (make-string (1+ (* 2 (length (match-string 1 m)))) ?\\)
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","))
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;; If a non-terminal argument ends on backslashes, make
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;; sure to also escape them as they will be followed by
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;; a comma.
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(concat arg (and (not (equal s ""))
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(string-match "\\\\+\\'" arg)
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(match-string 0 arg)))
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nil t)
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s)))))
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(defun org-macro-extract-arguments (s)
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"Extract macro arguments from string S.
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S is a string containing comma separated values properly escaped.
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Return a list of arguments, as strings. This is the opposite of
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`org-macro-escape-arguments'."
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;; Do not use `org-split-string' since empty strings are
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;; meaningful here.
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(split-string
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(replace-regexp-in-string
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"\\(\\\\*\\),"
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(lambda (str)
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(let ((len (length (match-string 1 str))))
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(concat (make-string (/ len 2) ?\\)
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(if (zerop (mod len 2)) "\000" ","))))
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s nil t)
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"\000"))
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;;; Helper functions and variables for internal macros
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(defun org-macro--vc-modified-time (file)
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(save-window-excursion
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(when (vc-backend file)
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(let ((buf (get-buffer-create " *org-vc*"))
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(case-fold-search t)
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date)
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(unwind-protect
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(progn
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(vc-call print-log file buf nil nil 1)
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(with-current-buffer buf
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(vc-exec-after
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(lambda ()
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(goto-char (point-min))
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(when (re-search-forward "Date:?[ \t]*" nil t)
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(let ((time (parse-time-string
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(buffer-substring
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(point) (line-end-position)))))
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(when (cl-some #'identity time)
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(setq date (apply #'encode-time time))))))))
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(let ((proc (get-buffer-process buf)))
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(while (and proc (accept-process-output proc .5 nil t)))))
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(kill-buffer buf))
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date))))
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(defvar org-macro--counter-table nil
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"Hash table containing counter value per name.")
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(defun org-macro--counter-initialize ()
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"Initialize `org-macro--counter-table'."
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(setq org-macro--counter-table (make-hash-table :test #'equal)))
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(defun org-macro--counter-increment (name &optional action)
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"Increment counter NAME.
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NAME is a string identifying the counter.
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When non-nil, optional argument ACTION is a string.
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If the string is \"-\", keep the NAME counter at its current
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value, i.e. do not increment.
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If the string represents an integer, set the counter to this number.
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Any other non-empty string resets the counter to 1."
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(let ((name-trimmed (org-trim name))
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(action-trimmed (when (org-string-nw-p action)
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(org-trim action))))
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(puthash name-trimmed
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(cond ((not (org-string-nw-p action-trimmed))
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(1+ (gethash name-trimmed org-macro--counter-table 0)))
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((string= "-" action-trimmed)
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(gethash name-trimmed org-macro--counter-table 1))
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((string-match-p "\\`[0-9]+\\'" action-trimmed)
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(string-to-number action-trimmed))
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(t 1))
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org-macro--counter-table)))
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(provide 'org-macro)
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;;; org-macro.el ends here
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