: Learning GNU Emacs, 3rd Edition

12.8.1 Working with Groups and Subtrees of Files

12.8.1 Working with Groups and Subtrees of Files

Usually, the projects you want to put under version control have more than one file; it's normal for them to contain all the files under a specific directory and subdirectory. Therefore, seeing a list of all version-controlled files beneath the current working directory is often useful. Being able to perform an operation on all of them en masse is even more useful.

VC mode supports this directly. The command C-x v d (for vc-directory) puts you in a buffer running a customized Dired (directory editing) mode, which lists all registered files under the current directory, indicating which, if any, are checked out and who has locked them. The status field in this listing is automatically kept up to date by check-in and check-out operations.

If you mark several files in this Dired buffer (with the ordinary Dired mark command described in Chapter 5) and then perform either a vc-next-action or vc-revert-buffer, VC performs that operation on all the marked files. The most common case in which you'll perform this procedure is when you want to check in changes to several files simultaneously. VC helps you out: it pops up a buffer for only one change comment, which it then applies to every revision the check-in creates.

The vc-revert-buffer design is a bit more conservative; normally, it prompts you once for each file to make sure you really want to discard its changes.

Some Dired commands are rebound in VC Dired to run version-control commands. The = keystroke, for example, runs vc-diff on the current file rather than a Dired diff. And g refreshes all the VC status fields in the directory.

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