fs2.io.file

Attributes of a file that are provided by most operating systems and file systems.

To get an instance of BasicFileAttributes, use Files[F].getBasicFileAttributes(path).

The fileKey operation returns a unique identifier for the file, if the operating system and file system supports providing such an identifier.

An opaque, unique identifier for a file.

Paths which have the same FileKey (via univerals equals), as reported by Files[F].getBasicFileAttributes(path).fileKey, are guaranteed to reference the same file on the file system.

Note: not all operating systems and file systems support file keys, hence BasicFileAttributes#fileKey returns an Option[FileKey].

Provides operations related to working with files in the effect F.

An instance is available for any effect F which has an Async[F] instance.

The operations on this trait are implemented for both the JVM and Node.js. Some operations only work on POSIX file systems, though such methods generally have "Posix" in their names (e.g. getPosixPermissions). A small number of methods are only available on the JVM (e.g. variant of list which takes a glob pattern) and are indicated as such in their ScalaDoc.

Flags describing how a file should be opened by Files[F].open(path, flags).

Common flag combinations are available in the companion (e.g. Flags.Write) Custom combinations are supported via the apply method (e.g., Flags(Flag.Write, Flag.CreateNew)).

Path to a file or directory on a file system.

The path API is inspired by the java.nio.file.Path API. On the JVM, a NIO path can be converted to an FS2 path via Path.fromNioPath(p) and likewise an FS2 path can be converted to a NIO path via p.toNioPath.

(When using this class on Node.js, the fromNioPath and toNioPath methods are not accessible.)

Generally, most methods have the same behavior as their NIO counterparts, though there are some slight differences -- e.g., resolve normalizes.

Describes the permissions of a file / directory.

Note: currently, there is only one subtype -- PosixPermissions. More types may be added in the future (e.g. Windows ACLs).

Describes POSIX file permissions, where the user, group, and others are each assigned read, write, and/or execute permissions.

The toString method provides a 9 character string where the first three characters indicate user permissions, the next three group permissions, and the final three others permissions. For example, rwxr-xr-- indicates the owner has read, write and execute, the group as read and execute, and others have read.

The value field encodes the permissions in the lowest 9 bits of an integer. bits 8-6 indicate read, write, and execute for the owner, 5-3 for the group, and 2-0 for others. rwxr-xr-- has the integer value 111101100 = 492.

The toOctalString method returns the a 3 digit string, where the first character indicates read, write and execute for the owner, the second digit for the group, and the third digit for others. rwxr-xr-- has the octal string 754.

Constructors from strings, octal strings, and integers, as well as explicitly enumerating permissions, are provided in the companion.

Associates a FileHandle with an offset in to the file.

This encapsulates the pattern of incrementally reading bytes in from a file, a chunk at a time. Convenience methods are provided for working with pulls.

Associates a FileHandle with an offset in to the file.

This encapsulates the pattern of incrementally writing bytes in to a file, a chunk at a time. Convenience methods are provided for working with pulls.

Copies a file from the source to the target path,

By default, the copy fails if the target file already exists or is a symbolic link.

Deletes a file.

If the file is a directory then the directory must be empty for this action to succeed. This action will fail if the path doesn't exist.

Checks if a file exists

Note that the result of this method is immediately outdated. If this method indicates the file exists then there is no guarantee that a subsequence access will succeed. Care should be taken when using this method in security sensitive applications.

Moves (or renames) a file from the source to the target path.

By default, the move fails if the target file already exists or is a symbolic link.

Get file permissions as set of PosixFilePermission.

This will only work for POSIX supporting file systems

Set file permissions from set of PosixFilePermission.

This will only work for POSIX supporting file systems

Returns an infinite stream of data from the file at the specified path. Starts reading from the specified offset and upon reaching the end of the file, polls every pollDuration for additional updates to the file.

Read operations are limited to emitting chunks of the specified chunk size but smaller chunks may occur.

If an error occurs while reading from the file, the overall stream fails.

Creates a resource containing the path of a temporary directory.

The temporary directory is removed during the resource release.

Creates a stream containing the path of a temporary directory.

The temporary directory is removed when the stream completes.

Creates a resource containing the path of a temporary file.

The temporary file is removed during the resource release.

Creates a stream containing the path of a temporary file.

The temporary file is removed when the stream completes.

Watches a single path.

Alias for creating a watcher and watching the supplied path, releasing the watcher when the resulting stream is finalized.

Creates a Watcher for the default file system.

The watcher is returned as a resource. To use the watcher, lift the resource to a stream, watch or register 1 or more paths, and then return watcher.events().

Writes all data to the file at the specified java.nio.file.Path.

Adds the WRITE flag to any other OpenOption flags specified. By default, also adds the CREATE flag.

Writes all data to a sequence of files, each limited in size to limit.

The computePath operation is used to compute the path of the first file and every subsequent file. Typically, the next file should be determined by analyzing the current state of the filesystem -- e.g., by looking at all files in a directory and generating a unique name.