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ac83bc01d7
Unique identifiers for entries can now be used more efficiently. Internally, a hash array has replaced the alist used so far to keep track of the files in which an ID is defined. This makes it quite fast to find an entry by ID. There is now a new link type which looks like this: id:GLOBALLY-UNIQUE-IDENTIFIER This link points to a specific entry. When you move the entry to a different file, for example if you move it to an archive file, this link will continue to work. The file /org-id.el/ contains an API that can be used to write code using these identifiers, including creating IDs and finding them wherever they are. Org has its own method to create unique identifiers, but if the system has /uuidgen/ command installed (Mac's and Linux systems generally do), it will be used by default. You an also select the method by hand, using the variable =org-id-method=. If the ID system ever gets confused about where a certain ID is, it initiates a global scan of all agenda files with associated archives, all files previously known containing any IDs, and all currently visited Org-mode files to rebuild the hash. You can also initiate this by hand: =M-x org-id-update-id-locations=. Running this command will also dump into the =*Messages*= buffer information about any duplicate IDs. These should not exist, but if you /copy/ an entry with its properties, duplicate IDs will inevitably be produced. This is unavoidable in a plain text system that allows you to edit the text in arbitrary ways, and a portion of care on your side is needed to keep this system clean. The hash is stored in the file =~/.emacs.d/.org-id-locations=. This is also a change from previous versions where the file was =~/.org=id-locations=. Therefore, you can remove this old file if you have it. I am not sure what will happen if the =.emacs.d= directory does not exists in your setup, but in modern Emacsen, I believe it should exist. If you do not want to use IDs across files, you can avoid the overhead with tracking IDs by customizing the variable =org-id-track-globally=. IDs can then still be used for links inside a single file. IDs will also be used when you create a new link to an Org-mode buffer. If you use =org-store-link= (normally at =C-c l=) inside en entry in an Org-mode buffer, and ID property will be created if it does not exist, and the stored link will be an =id:= link. If you prefer the much less secure linking to headline text, you can configure the variable =org-link-to-org-use-id=. The default setting for this variable is =create-if-interactive=, meaning that an ID will be created when you store a link interactively, but not if you happen to be in an Org-mode file while you create a remember note (which usually has a link to the place where you were when starting remember). |
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