12/27/2023 0 Comments Check for modifications tortoisehgPerl-style regexps are in any case already exhaustivelyĭocumented on a multitude of web sites, and in many books. I won't discuss Mercurial's regexp dialect in any detail here, as regexps are not often used. The Perl language's regexp syntax, which is the most popular dialect in use (it's also used in Java, for example). Mercurial accepts the same regular expression syntax as the Python programming language (it uses Python's regexp engine internally). Regular expression matching with re patterns ¶ Files that change a lot from one revision to the next may be expensive to store if you edit them frequently, and conflicts due to concurrent edits.ISO CD-ROM images, will by virtue of sheer size make clones over a network very slow. Files that are very large and incompressible, e.g.There are thus a few clear recommendations about specific kinds of files to be very careful with. Isn't even a good way to tell what the differences are between your respective changes. A single frequently-editedįile that is not friendly to Mercurial's storage assumptions can easily have an outsized effect on the size of the repository.Įven worse, if both you and someone else edit the OpenOffice document you're working on, there is no useful way to merge your work. Because most of the file changes every time you save, Mercurial will have to store allĢMB of the file every time you commit, even though from your perspective, perhaps only a few words are changing each time. Edit even a single letter of your document in OpenOffice, and almost every byte in the entire file willĬhange when you save it. OpenOffice storesĭocuments on disk as compressed zip files. To get an idea of how this could affect you in practice, suppose you want to use Mercurial to manage an OpenOffice document. This can affect both local storage needs and the amount of time it takes to clone a repository. If the differences between each successive version of a file are always large, Mercurial will not be able to store the file's revision history For instance, compressed files are particularly susceptible to However, some files (particularly binary files) are laid out in such a way that even a small change to aįile's logical content results in many or most of the bytes inside the file changing. When storing modifications to a file, Mercurial usually saves only the differences between the previous and current versions of the file. It may not be a good idea to use Mercurial-or any other distributed revision control system-to manage those files. If you have a team where several people may be editing binary files frequently, Prevent two people from making conflicting changes to a binary file. That allow a user to say “I am the only person who can edit this file”.Ĭompared to a centralized system, a distributed revision control system changes some of the factors that guide decisions over which files to manageįor instance, a distributed revision control system cannot, by its nature, offer a file locking facility. geometry data, textures, mapīecause it is usually impossible to merge two conflicting modifications to a binary file, centralized systems often provide a file locking mechanism Some centralized revision control systems can also deal tolerably well with binary files, such as bitmap images.įor instance, a game development team will typically manage both its source code and all of its binary assets (e.g. Revision control systems are generally best at managing text files that are written by humans, such as source code, where the files do not change muchįrom one revision to the next. Which files to manage, and which to avoid ¶ ”) is treated as hidden by most commands and GUI tools. On Unix-like systems, any file name that begins with a period (“. One is to create a directory, then hg add a “hidden” file If you need an empty directory in your repository, there are a few ways to achieve this. Mercurial thus felt that the complexity that would be required to manage empty directories was not worth the limited benefit this feature would bring. Trivial distinction, but it has one minor practical consequence: it is not possible to represent a completely empty directory in Mercurial.Įmpty directories are rarely useful, and there are unintrusive workarounds that you can use to achieve an appropriate effect. After it deletes a file, it then deletes any empty directories that were in the deleted file's path. Before creating a file, it first creates any missing directoryĬomponents of the path. Mercurial does not track directory information. Mercurial tracks files, not directories ¶
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