;;; org-id.el --- Global identifiers for Org entries -*- lexical-binding: t; -*-
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;;
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;; Copyright (C) 2008-2018 Free Software Foundation, Inc.
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;;
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;; Author: Carsten Dominik <carsten at orgmode dot org>
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;; Keywords: outlines, hypermedia, calendar, wp
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;; Homepage: https://orgmode.org
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;;
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;; This file is part of GNU Emacs.
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;;
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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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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;
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;;; Commentary:
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;; This file implements globally unique identifiers for Org entries.
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;; Identifiers are stored in the entry as an :ID: property. Functions
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;; are provided that create and retrieve such identifiers, and that find
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;; entries based on the identifier.
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;; Identifiers consist of a prefix (default "Org" given by the variable
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;; `org-id-prefix') and a unique part that can be created by a number
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;; of different methods, see the variable `org-id-method'.
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;; Org has a builtin method that uses a compact encoding of the creation
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;; time of the ID, with microsecond accuracy. This virtually
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;; guarantees globally unique identifiers, even if several people are
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;; creating IDs at the same time in files that will eventually be used
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;; together.
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;;
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;; By default Org uses UUIDs as global unique identifiers.
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;;
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;; This file defines the following API:
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;;
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;; org-id-get-create
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;; Create an ID for the entry at point if it does not yet have one.
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;; Returns the ID (old or new). This function can be used
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;; interactively, with prefix argument the creation of a new ID is
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;; forced, even if there was an old one.
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;;
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;; org-id-get
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;; Get the ID property of an entry. Using appropriate arguments
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;; to the function, it can also create the ID for this entry.
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;;
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;; org-id-goto
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;; Command to go to a specific ID, this command can be used
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;; interactively.
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;;
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;; org-id-get-with-outline-path-completion
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;; Retrieve the ID of an entry, using outline path completion.
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;; This function can work for multiple files.
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;;
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;; org-id-get-with-outline-drilling
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;; Retrieve the ID of an entry, using outline path completion.
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;; This function only works for the current file.
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;;
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;; org-id-find
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;; Find the location of an entry with specific id.
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;;
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;;; Code:
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(require 'org)
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(declare-function message-make-fqdn "message" ())
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;;; Customization
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(defgroup org-id nil
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"Options concerning global entry identifiers in Org mode."
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:tag "Org ID"
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:group 'org)
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(defcustom org-id-link-to-org-use-id nil
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"Non-nil means storing a link to an Org file will use entry IDs.
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\\<org-mode-map>\
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The variable can have the following values:
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t Create an ID if needed to make a link to the current entry.
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create-if-interactive
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If `org-store-link' is called directly (interactively, as a user
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command), do create an ID to support the link. But when doing the
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job for capture, only use the ID if it already exists. The
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purpose of this setting is to avoid proliferation of unwanted
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IDs, just because you happen to be in an Org file when you
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call `org-capture' that automatically and preemptively creates a
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link. If you do want to get an ID link in a capture template to
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an entry not having an ID, create it first by explicitly creating
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a link to it, using `\\[org-store-link]' first.
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create-if-interactive-and-no-custom-id
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Like create-if-interactive, but do not create an ID if there is
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a CUSTOM_ID property defined in the entry.
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use-existing
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Use existing ID, do not create one.
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nil Never use an ID to make a link, instead link using a text search for
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the headline text."
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:group 'org-link-store
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:group 'org-id
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:version "24.3"
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:type '(choice
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(const :tag "Create ID to make link" t)
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(const :tag "Create if storing link interactively"
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create-if-interactive)
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(const :tag "Create if storing link interactively and no CUSTOM_ID is present"
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create-if-interactive-and-no-custom-id)
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(const :tag "Only use existing" use-existing)
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(const :tag "Do not use ID to create link" nil)))
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(defcustom org-id-uuid-program "uuidgen"
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"The uuidgen program."
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:group 'org-id
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:type 'string)
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(defcustom org-id-method 'uuid
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"The method that should be used to create new IDs.
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An ID will consist of the optional prefix specified in `org-id-prefix',
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and a unique part created by the method this variable specifies.
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Allowed values are:
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org Org's own internal method, using an encoding of the current time to
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microsecond accuracy, and optionally the current domain of the
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computer. See the variable `org-id-include-domain'.
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uuid Create random (version 4) UUIDs. If the program defined in
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`org-id-uuid-program' is available it is used to create the ID.
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Otherwise an internal functions is used."
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:group 'org-id
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:type '(choice
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(const :tag "Org's internal method" org)
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(const :tag "external: uuidgen" uuid)))
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(defcustom org-id-prefix nil
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"The prefix for IDs.
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This may be a string, or it can be nil to indicate that no prefix is required.
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When a string, the string should have no space characters as IDs are expected
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to have no space characters in them."
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:group 'org-id
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:type '(choice
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(const :tag "No prefix")
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(string :tag "Prefix")))
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(defcustom org-id-include-domain nil
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"Non-nil means add the domain name to new IDs.
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This ensures global uniqueness of IDs, and is also suggested by
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RFC 2445 in combination with RFC 822. This is only relevant if
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`org-id-method' is `org'. When uuidgen is used, the domain will never
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be added.
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The default is to not use this because we have no really good way to get
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the true domain, and Org entries will normally not be shared with enough
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people to make this necessary."
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:group 'org-id
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:type 'boolean)
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(defcustom org-id-track-globally t
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"Non-nil means track IDs through files, so that links work globally.
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This work by maintaining a hash table for IDs and writing this table
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to disk when exiting Emacs. Because of this, it works best if you use
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a single Emacs process, not many.
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When nil, IDs are not tracked. Links to IDs will still work within
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a buffer, but not if the entry is located in another file.
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IDs can still be used if the entry with the id is in the same file as
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the link."
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:group 'org-id
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:type 'boolean)
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(defcustom org-id-locations-file (convert-standard-filename
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(concat user-emacs-directory ".org-id-locations"))
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"The file for remembering in which file an ID was defined.
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This variable is only relevant when `org-id-track-globally' is set."
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:group 'org-id
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:type 'file)
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(defvar org-id-locations nil
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"List of files with IDs in those files.")
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(defvar org-id-files nil
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"List of files that contain IDs.")
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(defcustom org-id-extra-files 'org-agenda-text-search-extra-files
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"Files to be searched for IDs, besides the agenda files.
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When Org reparses files to remake the list of files and IDs it is tracking,
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it will normally scan the agenda files, the archives related to agenda files,
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any files that are listed as ID containing in the current register, and
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any Org file currently visited by Emacs.
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You can list additional files here.
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This variable is only relevant when `org-id-track-globally' is set."
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:group 'org-id
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:type
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'(choice
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(symbol :tag "Variable")
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(repeat :tag "List of files"
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(file))))
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(defcustom org-id-search-archives t
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"Non-nil means search also the archive files of agenda files for entries.
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This is a possibility to reduce overhead, but it means that entries moved
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to the archives can no longer be found by ID.
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This variable is only relevant when `org-id-track-globally' is set."
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:group 'org-id
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:type 'boolean)
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;;; The API functions
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;;;###autoload
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(defun org-id-get-create (&optional force)
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"Create an ID for the current entry and return it.
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If the entry already has an ID, just return it.
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With optional argument FORCE, force the creation of a new ID."
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(interactive "P")
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(when force
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(org-entry-put (point) "ID" nil))
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(org-id-get (point) 'create))
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;;;###autoload
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(defun org-id-copy ()
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"Copy the ID of the entry at point to the kill ring.
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Create an ID if necessary."
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(interactive)
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(org-kill-new (org-id-get nil 'create)))
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;;;###autoload
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(defun org-id-get (&optional pom create prefix)
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"Get the ID property of the entry at point-or-marker POM.
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If POM is nil, refer to the entry at point.
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If the entry does not have an ID, the function returns nil.
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However, when CREATE is non nil, create an ID if none is present already.
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PREFIX will be passed through to `org-id-new'.
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In any case, the ID of the entry is returned."
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(org-with-point-at pom
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(let ((id (org-entry-get nil "ID")))
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(cond
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((and id (stringp id) (string-match "\\S-" id))
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id)
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(create
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(setq id (org-id-new prefix))
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(org-entry-put pom "ID" id)
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(org-id-add-location id (buffer-file-name (buffer-base-buffer)))
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id)))))
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;;;###autoload
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(defun org-id-get-with-outline-path-completion (&optional targets)
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"Use `outline-path-completion' to retrieve the ID of an entry.
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TARGETS may be a setting for `org-refile-targets' to define
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eligible headlines. When omitted, all headlines in the current
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file are eligible. This function returns the ID of the entry.
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If necessary, the ID is created."
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(let* ((org-refile-targets (or targets '((nil . (:maxlevel . 10)))))
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(org-refile-use-outline-path
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(if (caar org-refile-targets) 'file t))
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(org-refile-target-verify-function nil)
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(spos (org-refile-get-location "Entry"))
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(pom (and spos (move-marker (make-marker) (nth 3 spos)
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(get-file-buffer (nth 1 spos))))))
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(prog1 (org-id-get pom 'create)
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(move-marker pom nil))))
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;;;###autoload
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(defun org-id-get-with-outline-drilling ()
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"Use an outline-cycling interface to retrieve the ID of an entry.
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This only finds entries in the current buffer, using `org-get-location'.
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It returns the ID of the entry. If necessary, the ID is created."
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(let* ((spos (org-get-location (current-buffer) org-goto-help))
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(pom (and spos (move-marker (make-marker) (car spos)))))
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(prog1 (org-id-get pom 'create)
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(move-marker pom nil))))
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;;;###autoload
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(defun org-id-goto (id)
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"Switch to the buffer containing the entry with id ID.
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Move the cursor to that entry in that buffer."
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(interactive "sID: ")
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(let ((m (org-id-find id 'marker)))
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(unless m
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(error "Cannot find entry with ID \"%s\"" id))
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(pop-to-buffer-same-window (marker-buffer m))
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(goto-char m)
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(move-marker m nil)
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(org-show-context)))
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;;;###autoload
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(defun org-id-find (id &optional markerp)
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"Return the location of the entry with the id ID.
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The return value is a cons cell (file-name . position), or nil
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if there is no entry with that ID.
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With optional argument MARKERP, return the position as a new marker."
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(cond
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((symbolp id) (setq id (symbol-name id)))
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((numberp id) (setq id (number-to-string id))))
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(let ((file (org-id-find-id-file id))
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org-agenda-new-buffers where)
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(when file
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(setq where (org-id-find-id-in-file id file markerp)))
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(unless where
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(org-id-update-id-locations nil t)
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(setq file (org-id-find-id-file id))
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(when file
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(setq where (org-id-find-id-in-file id file markerp))))
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where))
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;;; Internal functions
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;; Creating new IDs
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;;;###autoload
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(defun org-id-new (&optional prefix)
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"Create a new globally unique ID.
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An ID consists of two parts separated by a colon:
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- a prefix
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- a unique part that will be created according to `org-id-method'.
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PREFIX can specify the prefix, the default is given by the variable
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`org-id-prefix'. However, if PREFIX is the symbol `none', don't use any
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prefix even if `org-id-prefix' specifies one.
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So a typical ID could look like \"Org:4nd91V40HI\"."
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(let* ((prefix (if (eq prefix 'none)
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""
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(concat (or prefix org-id-prefix) ":")))
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unique)
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(if (equal prefix ":") (setq prefix ""))
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(cond
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((memq org-id-method '(uuidgen uuid))
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(setq unique (org-trim (shell-command-to-string org-id-uuid-program)))
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(unless (org-uuidgen-p unique)
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(setq unique (org-id-uuid))))
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((eq org-id-method 'org)
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(let* ((etime (org-reverse-string (org-id-time-to-b36)))
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(postfix (if org-id-include-domain
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(progn
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(require 'message)
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(concat "@" (message-make-fqdn))))))
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(setq unique (concat etime postfix))))
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(t (error "Invalid `org-id-method'")))
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(concat prefix unique)))
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(defun org-id-uuid ()
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"Return string with random (version 4) UUID."
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(let ((rnd (md5 (format "%s%s%s%s%s%s%s"
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(random)
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(current-time)
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(user-uid)
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(emacs-pid)
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(user-full-name)
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user-mail-address
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(recent-keys)))))
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(format "%s-%s-4%s-%s%s-%s"
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(substring rnd 0 8)
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(substring rnd 8 12)
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(substring rnd 13 16)
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(format "%x"
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(logior
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#b10000000
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(logand
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#b10111111
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(string-to-number
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(substring rnd 16 18) 16))))
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(substring rnd 18 20)
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(substring rnd 20 32))))
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(defun org-id-int-to-b36-one-digit (i)
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"Turn an integer between 0 and 61 into a single character 0..9, A..Z, a..z."
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(cond
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((< i 10) (+ ?0 i))
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((< i 36) (+ ?a i -10))
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(t (error "Larger that 35"))))
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(defun org-id-b36-to-int-one-digit (i)
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"Turn a character 0..9, A..Z, a..z into a number 0..61.
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The input I may be a character, or a single-letter string."
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(and (stringp i) (setq i (string-to-char i)))
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(cond
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((and (>= i ?0) (<= i ?9)) (- i ?0))
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((and (>= i ?a) (<= i ?z)) (+ (- i ?a) 10))
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(t (error "Invalid b36 letter"))))
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(defun org-id-int-to-b36 (i &optional length)
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"Convert an integer to a base-36 number represented as a string."
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(let ((s ""))
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(while (> i 0)
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(setq s (concat (char-to-string
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(org-id-int-to-b36-one-digit (mod i 36))) s)
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i (/ i 36)))
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(setq length (max 1 (or length 1)))
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(if (< (length s) length)
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(setq s (concat (make-string (- length (length s)) ?0) s)))
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s))
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(defun org-id-b36-to-int (s)
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"Convert a base-36 string into the corresponding integer."
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(let ((r 0))
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(mapc (lambda (i) (setq r (+ (* r 36) (org-id-b36-to-int-one-digit i))))
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s)
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r))
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(defun org-id-time-to-b36 (&optional time)
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"Encode TIME as a 10-digit string.
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This string holds the time to micro-second accuracy, and can be decoded
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using `org-id-decode'."
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(setq time (or time (current-time)))
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(concat (org-id-int-to-b36 (nth 0 time) 4)
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(org-id-int-to-b36 (nth 1 time) 4)
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(org-id-int-to-b36 (or (nth 2 time) 0) 4)))
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(defun org-id-decode (id)
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"Split ID into the prefix and the time value that was used to create it.
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The return value is (prefix . time) where PREFIX is nil or a string,
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and time is the usual three-integer representation of time."
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(let (prefix time parts)
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(setq parts (org-split-string id ":"))
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(if (= 2 (length parts))
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(setq prefix (car parts) time (nth 1 parts))
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(setq prefix nil time (nth 0 parts)))
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(setq time (org-reverse-string time))
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(setq time (list (org-id-b36-to-int (substring time 0 4))
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(org-id-b36-to-int (substring time 4 8))
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(org-id-b36-to-int (substring time 8 12))))
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(cons prefix time)))
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;; Storing ID locations (files)
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;;;###autoload
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(defun org-id-update-id-locations (&optional files silent)
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"Scan relevant files for IDs.
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Store the relation between files and corresponding IDs.
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This will scan all agenda files, all associated archives, and all
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files currently mentioned in `org-id-locations'.
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When FILES is given, scan these files instead."
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(interactive)
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(if (not org-id-track-globally)
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(error "Please turn on `org-id-track-globally' if you want to track IDs")
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(let* ((org-id-search-archives
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(or org-id-search-archives
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(and (symbolp org-id-extra-files)
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(symbol-value org-id-extra-files)
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(member 'agenda-archives org-id-extra-files))))
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(files
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(or files
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(append
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;; Agenda files and all associated archives
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(org-agenda-files t org-id-search-archives)
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;; Explicit extra files
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(if (symbolp org-id-extra-files)
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(symbol-value org-id-extra-files)
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org-id-extra-files)
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;; Files associated with live Org buffers
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(delq nil
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(mapcar (lambda (b)
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(with-current-buffer b
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(and (derived-mode-p 'org-mode) (buffer-file-name))))
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(buffer-list)))
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;; All files known to have IDs
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org-id-files)))
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org-agenda-new-buffers
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file nfiles tfile ids reg found id seen (ndup 0))
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(when (member 'agenda-archives files)
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(setq files (delq 'agenda-archives (copy-sequence files))))
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(setq nfiles (length files))
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(while (setq file (pop files))
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(unless silent
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(message "Finding ID locations (%d/%d files): %s"
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(- nfiles (length files)) nfiles file))
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(setq tfile (file-truename file))
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(when (and (file-exists-p file) (not (member tfile seen)))
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(push tfile seen)
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(setq ids nil)
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(with-current-buffer (org-get-agenda-file-buffer file)
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(save-excursion
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(save-restriction
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(widen)
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(goto-char (point-min))
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(while (re-search-forward "^[ \t]*:ID:[ \t]+\\(\\S-+\\)[ \t]*$"
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nil t)
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(setq id (match-string-no-properties 1))
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(if (member id found)
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(progn
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(message "Duplicate ID \"%s\", also in file %s"
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id (or (car (delq
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nil
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(mapcar
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(lambda (x)
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(if (member id (cdr x))
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(car x)))
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reg)))
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(buffer-file-name)))
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(when (= ndup 0)
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(ding)
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(sit-for 2))
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(setq ndup (1+ ndup)))
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(push id found)
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(push id ids)))
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(push (cons (abbreviate-file-name file) ids) reg))))))
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(org-release-buffers org-agenda-new-buffers)
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(setq org-agenda-new-buffers nil)
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(setq org-id-locations reg)
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(setq org-id-files (mapcar 'car org-id-locations))
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(org-id-locations-save) ;; this function can also handle the alist form
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;; now convert to a hash
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(setq org-id-locations (org-id-alist-to-hash org-id-locations))
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(if (> ndup 0)
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(message "WARNING: %d duplicate IDs found, check *Messages* buffer" ndup)
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(message "%d unique files scanned for IDs" (length org-id-files)))
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org-id-locations)))
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(defun org-id-locations-save ()
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"Save `org-id-locations' in `org-id-locations-file'."
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(when (and org-id-track-globally org-id-locations)
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(let ((out (if (hash-table-p org-id-locations)
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(org-id-hash-to-alist org-id-locations)
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org-id-locations)))
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(with-temp-file org-id-locations-file
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(let ((print-level nil)
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(print-length nil))
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(print out (current-buffer)))))))
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(defun org-id-locations-load ()
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"Read the data from `org-id-locations-file'."
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(setq org-id-locations nil)
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(when org-id-track-globally
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(with-temp-buffer
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(condition-case nil
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(progn
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(insert-file-contents org-id-locations-file)
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(setq org-id-locations (read (current-buffer))))
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(error
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(message "Could not read org-id-values from %s. Setting it to nil."
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org-id-locations-file))))
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(setq org-id-files (mapcar 'car org-id-locations))
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(setq org-id-locations (org-id-alist-to-hash org-id-locations))))
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(defun org-id-add-location (id file)
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"Add the ID with location FILE to the database of ID locations."
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;; Only if global tracking is on, and when the buffer has a file
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(when (and org-id-track-globally id file)
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(unless org-id-locations (org-id-locations-load))
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(puthash id (abbreviate-file-name file) org-id-locations)
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(add-to-list 'org-id-files (abbreviate-file-name file))))
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|
(unless noninteractive
|
(add-hook 'kill-emacs-hook 'org-id-locations-save))
|
|
(defun org-id-hash-to-alist (hash)
|
"Turn an org-id hash into an alist, so that it can be written to a file."
|
(let (res x)
|
(maphash
|
(lambda (k v)
|
(if (setq x (member v res))
|
(setcdr x (cons k (cdr x)))
|
(push (list v k) res)))
|
hash)
|
res))
|
|
(defun org-id-alist-to-hash (list)
|
"Turn an org-id location list into a hash table."
|
(let ((res (make-hash-table
|
:test 'equal
|
:size (apply '+ (mapcar 'length list))))
|
f)
|
(mapc
|
(lambda (x)
|
(setq f (car x))
|
(mapc (lambda (i) (puthash i f res)) (cdr x)))
|
list)
|
res))
|
|
(defun org-id-paste-tracker (txt &optional buffer-or-file)
|
"Update any IDs in TXT and assign BUFFER-OR-FILE to them."
|
(when org-id-track-globally
|
(save-match-data
|
(setq buffer-or-file (or buffer-or-file (current-buffer)))
|
(when (bufferp buffer-or-file)
|
(setq buffer-or-file (or (buffer-base-buffer buffer-or-file)
|
buffer-or-file))
|
(setq buffer-or-file (buffer-file-name buffer-or-file)))
|
(when buffer-or-file
|
(let ((fname (abbreviate-file-name buffer-or-file))
|
(s 0))
|
(while (string-match "^[ \t]*:ID:[ \t]+\\([^ \t\n\r]+\\)" txt s)
|
(setq s (match-end 0))
|
(org-id-add-location (match-string 1 txt) fname)))))))
|
|
;; Finding entries with specified id
|
|
;;;###autoload
|
(defun org-id-find-id-file (id)
|
"Query the id database for the file in which this ID is located."
|
(unless org-id-locations (org-id-locations-load))
|
(or (and org-id-locations
|
(hash-table-p org-id-locations)
|
(gethash id org-id-locations))
|
;; ball back on current buffer
|
(buffer-file-name (or (buffer-base-buffer (current-buffer))
|
(current-buffer)))))
|
|
(defun org-id-find-id-in-file (id file &optional markerp)
|
"Return the position of the entry ID in FILE.
|
If that files does not exist, or if it does not contain this ID,
|
return nil.
|
The position is returned as a cons cell (file-name . position). With
|
optional argument MARKERP, return the position as a new marker."
|
(let (org-agenda-new-buffers buf pos)
|
(cond
|
((not file) nil)
|
((not (file-exists-p file)) nil)
|
(t (with-current-buffer (setq buf (org-get-agenda-file-buffer file))
|
(setq pos (org-find-entry-with-id id))
|
(when pos
|
(if markerp
|
(move-marker (make-marker) pos buf)
|
(cons file pos))))))))
|
|
;; id link type
|
|
;; Calling the following function is hard-coded into `org-store-link',
|
;; so we do have to add it to `org-store-link-functions'.
|
|
;;;###autoload
|
(defun org-id-store-link ()
|
"Store a link to the current entry, using its ID."
|
(interactive)
|
(when (and (buffer-file-name (buffer-base-buffer)) (derived-mode-p 'org-mode))
|
(let* ((link (concat "id:" (org-id-get-create)))
|
(case-fold-search nil)
|
(desc (save-excursion
|
(org-back-to-heading t)
|
(or (and (looking-at org-complex-heading-regexp)
|
(if (match-end 4)
|
(match-string 4)
|
(match-string 0)))
|
link))))
|
(org-store-link-props :link link :description desc :type "id")
|
link)))
|
|
(defun org-id-open (id)
|
"Go to the entry with id ID."
|
(org-mark-ring-push)
|
(let ((m (org-id-find id 'marker))
|
cmd)
|
(unless m
|
(error "Cannot find entry with ID \"%s\"" id))
|
;; Use a buffer-switching command in analogy to finding files
|
(setq cmd
|
(or
|
(cdr
|
(assq
|
(cdr (assq 'file org-link-frame-setup))
|
'((find-file . switch-to-buffer)
|
(find-file-other-window . switch-to-buffer-other-window)
|
(find-file-other-frame . switch-to-buffer-other-frame))))
|
'switch-to-buffer-other-window))
|
(if (not (equal (current-buffer) (marker-buffer m)))
|
(funcall cmd (marker-buffer m)))
|
(goto-char m)
|
(move-marker m nil)
|
(org-show-context)))
|
|
(org-link-set-parameters "id" :follow #'org-id-open)
|
|
(provide 'org-id)
|
|
;; Local variables:
|
;; generated-autoload-file: "org-loaddefs.el"
|
;; End:
|
|
;;; org-id.el ends here
|
