Setfs

setfs.md

Replace hierarchical directories with categories.

Categories

/foo - Contains all files in the category foo.

/foo/bar - Contains all files in the intersection of category foo and category bar.

/bar/foo - Equivalent to /foo/bar.

/foo+bar/ - Files in the union of categories foo and bar. Of course, new files cannot be created in this union, as it is non-constructive.

Using a program like ls will list those files matching the chosen category restrictions, as well as all further categories by which these files may be separated. For example, consider a file system as follows:

$ ls /foo/bar
 apple
 banana

$ ls /foo/baz
 /pop
 banana
 cherry

$ ls /foo/baz/pop
 pear

Then

$ ls /foo
 /bar
 /baz
 /pop
 apple
 banana
 cherry
 pear

Queries

Query categories are computed as they are used. Some examples:

/ext:md/ - Files with the extension .md

/ext?/ - All files with extensions, and a category for each extension they have

/ext?/md/ - Equivalent to /ext:md/

/executable?? - Files which the current user can execute

/executable?! - Files which the current user cannot execute

/executable? - All files, and categories true and false corresponding to the two queries above.