simplifile

Types

FileError

This type represents all of the reasons for why a file system operation could fail.

Most of these reasons are POSIX errors, which come from the operating system and start with E. Others have been added to represent other issues that may arise specific to this library.

pub type FileError {
  Eacces
  Eagain
  Ebadf
  Ebadmsg
  Ebusy
  Edeadlk
  Edeadlock
  Edquot
  Eexist
  Efault
  Efbig
  Eftype
  Eintr
  Einval
  Eio
  Eisdir
  Eloop
  Emfile
  Emlink
  Emultihop
  Enametoolong
  Enfile
  Enobufs
  Enodev
  Enolck
  Enolink
  Enoent
  Enomem
  Enospc
  Enosr
  Enostr
  Enosys
  Enotblk
  Enotdir
  Enotsup
  Enxio
  Eopnotsupp
  Eoverflow
  Eperm
  Epipe
  Erange
  Erofs
  Espipe
  Esrch
  Estale
  Etxtbsy
  Exdev
  NotUtf8
  Unknown(inner: String)
}

Constructors

```
Eacces
```
Permission denied.
```
Eagain
```
Resource temporarily unavailable.
```
Ebadf
```
Bad file number
```
Ebadmsg
```
Bad message.
```
Ebusy
```
File busy.
```
Edeadlk
```
Resource deadlock avoided.
```
Edeadlock
```
On most architectures, same as Edeadlk. On some architectures, it means “File locking deadlock error.”
```
Edquot
```
Disk quota exceeded.
```
Eexist
```
File already exists.
```
Efault
```
Bad address in system call argument.
```
Efbig
```
File too large.
```
Eftype
```
Inappropriate file type or format. Usually caused by trying to set the “sticky bit” on a regular file (not a directory).
```
Eintr
```
Interrupted system call.
```
Einval
```
Invalid argument.
```
Eio
```
I/O error.
```
Eisdir
```
Illegal operation on a directory.
```
Eloop
```
Too many levels of symbolic links.
```
Emfile
```
Too many open files.
```
Emlink
```
Too many links.
```
Emultihop
```
Multihop attempted.
```
Enametoolong
```
Filename too long
```
Enfile
```
File table overflow
```
Enobufs
```
No buffer space available.
```
Enodev
```
No such device.
```
Enolck
```
No locks available.
```
Enolink
```
Link has been severed.
```
Enoent
```
No such file or directory.
```
Enomem
```
Not enough memory.
```
Enospc
```
No space left on device.
```
Enosr
```
No STREAM resources.
```
Enostr
```
Not a STREAM.
```
Enosys
```
Function not implemented.
```
Enotblk
```
Block device required.
```
Enotdir
```
Not a directory.
```
Enotsup
```
Operation not supported.
```
Enxio
```
No such device or address.
```
Eopnotsupp
```
Operation not supported on socket.
```
Eoverflow
```
Value too large to be stored in data type.
```
Eperm
```
Not owner.
```
Epipe
```
Broken pipe.
```
Erange
```
Result too large.
```
Erofs
```
Read-only file system.
```
Espipe
```
Invalid seek.
```
Esrch
```
No such process.
```
Estale
```
Stale remote file handle.
```
Etxtbsy
```
Text file busy.
```
Exdev
```
Cross-domain link.
```
NotUtf8
```
File was requested to be read as UTF-8, but is not UTF-8 encoded.
```
Unknown(inner: String)
```
Any error not accounted for by this type

FileInfo

</>

Represents the intersection of information available from erlang’s file:read_file_info and node’s fs.stat

pub type FileInfo {
  FileInfo(
    size: Int,
    mode: Int,
    nlinks: Int,
    inode: Int,
    user_id: Int,
    group_id: Int,
    dev: Int,
    atime_seconds: Int,
    mtime_seconds: Int,
    ctime_seconds: Int,
  )
}

Constructors

```
FileInfo(
  size: Int,
  mode: Int,
  nlinks: Int,
  inode: Int,
  user_id: Int,
  group_id: Int,
  dev: Int,
  atime_seconds: Int,
  mtime_seconds: Int,
  ctime_seconds: Int,
)
```
Arguments
- size
  
  File size in bytes.
- mode
  
  File mode that indicates the file type and its permissions. For example, in Unix and Linux, a mode value of 33188 indicates a regular file and the permissions associated with it (read and write for the owner, and read-only for others, in this case).
- nlinks
  
  Number of hard links that exist for the file.
- inode
  
  Inode number, which is a unique identifier for the file in the filesystem.
- user_id
  
  User ID of the file’s owner.
- group_id
  
  Group ID of the file’s group.
- dev
  
  Device ID of the file’s major device. TODO: We can actually get a major device and minor device from both node and erlang. The fs.stat in node returns a dev and rdev, so we can use some bitwise operations to get the minor out of rdev. Someone who’s not me should totally make a PR for that.
- atime_seconds
  
  The last access time in seconds since the UNIX epoch (00:00:00 UTC on 1 January 1970).
- mtime_seconds
  
  The last modification time in seconds since the UNIX epoch (00:00:00 UTC on 1 January 1970).
- ctime_seconds
  
  The last change time in seconds since the UNIX epoch (00:00:00 UTC on 1 January 1970).

FilePermissions

</>

Represents a set of file permissions for a given file

pub type FilePermissions {
  FilePermissions(
    user: Set(Permission),
    group: Set(Permission),
    other: Set(Permission),
  )
}

Constructors

FilePermissions(
  user: Set(Permission),
  group: Set(Permission),
  other: Set(Permission),
)

Functions

append

</>

pub fn append(
  to filepath: String,
  contents contents: String,
) -> Result(Nil, FileError)

Append a string to the contents of a file at the given path

Example

let assert Ok(Nil) = append(to: "./needs_more_text.txt", contents: "more text")

append_bits

</>

pub fn append_bits(
  to filepath: String,
  bits bits: BitArray,
) -> Result(Nil, FileError)

Append a bitstring to the contents of a file at the given path

Example

let assert Ok(Nil) = append_bits(to: "./needs_more_text.txt", bits: <<"more text":utf8>>)

clear_directory

</>

pub fn clear_directory(at path: String) -> Result(Nil, FileError)

Clear the contents of a directory, deleting all files and directories within but leaving the top level directory in place.

copy_file

</>

pub fn copy_file(
  at src: String,
  to dest: String,
) -> Result(Nil, FileError)

Copy a file at a given path to another path. Note: destination should include the filename, not just the directory

create_directory

</>

pub fn create_directory(
  filepath: String,
) -> Result(Nil, FileError)

Create a directory at the provided filepath. Returns an error if the directory already exists.

Example

create_directory("./test")

create_directory_all

</>

pub fn create_directory_all(
  dirpath: String,
) -> Result(Nil, FileError)

Recursively creates necessary directories for a given directory path. Note that if you pass a path that “looks like” a file, i.e. ./a/b.txt, a folder named b.txt will be created, so be sure to pass only the path to the required directory.

create_file

</>

pub fn create_file(at filepath: String) -> Result(Nil, FileError)

Creates an empty file at the given filepath. Returns an Error(Eexist) if the file already exists.

create_symlink

</>

pub fn create_symlink(
  to target: String,
  from symlink: String,
) -> Result(Nil, FileError)

Create a symbolic link called symlink pointing to target.

Example

create_symlink("../target", "./symlink")

current_directory

</>

pub fn current_directory() -> Result(String, FileError)

Returns the current working directory

delete

</>

pub fn delete(
  file_or_dir_at path: String,
) -> Result(Nil, FileError)

Delete a file or directory at a given path. Performs a recursive delete on a directory. Throws an error if the path does not exist.

Example

let assert Ok(Nil) = delete(file_at: "./delete_me.txt")

delete_all

</>

pub fn delete_all(
  paths paths: List(String),
) -> Result(Nil, FileError)

Delete all files/directories specified in a list of paths. Recursively deletes provided directories. Does not return an error if one or more of the provided paths do not exist.

describe_error

</>

pub fn describe_error(error: FileError) -> String

Convert an error into a human-readable description

Example

let assert "Input/output error" = describe_error(Eio)

file_info

</>

pub fn file_info(filepath: String) -> Result(FileInfo, FileError)

Get information about a file at a given path

file_permissions_to_octal

</>

pub fn file_permissions_to_octal(
  permissions: FilePermissions,
) -> Int

get_files

</>

pub fn get_files(
  in directory: String,
) -> Result(List(String), FileError)

Returns a list of filepaths for every file in the directory, including nested files.

is_directory

</>

pub fn is_directory(filepath: String) -> Result(Bool, FileError)

Checks if the provided filepath exists and is a directory. Returns an error if it lacks permissions to read the directory.

Example

let assert Ok(True) = is_directory("./test")

is_file

</>

pub fn is_file(filepath: String) -> Result(Bool, FileError)

Checks if the file at the provided filepath exists and is a file. Returns an Error if it lacks permissions to read the file.

Example

let assert Ok(True) = is_file("./test.txt")

is_symlink

</>

pub fn is_symlink(filepath: String) -> Result(Bool, FileError)

Checks if the file at the provided filepath exists and is a symbolic link. Returns an Error if it lacks permissions to read the file.

Example

let assert Ok(True) = is_symlink("./symlink")

read

</>

pub fn read(from filepath: String) -> Result(String, FileError)

Read a files contents as a string

Example

let assert Ok(records) = read(from: "./users.csv")

read_bits

</>

pub fn read_bits(
  from filepath: String,
) -> Result(BitArray, FileError)

Read a files contents as a bitstring

Example

let assert Ok(records) = read_bits(from: "./users.csv")

read_directory

</>

pub fn read_directory(
  at path: String,
) -> Result(List(String), FileError)

Lists the contents of a directory. The list contains directory and file names, and is not recursive.

Example

let assert Ok(files_and_folders) = read_directory(at: "./Folder1")

rename_directory

</>

pub fn rename_directory(
  at src: String,
  to dest: String,
) -> Result(Nil, FileError)

Copy a directory recursively and then delete the old one.

rename_file

</>

pub fn rename_file(
  at src: String,
  to dest: String,
) -> Result(Nil, FileError)

Rename a file at a given path to another path. Note: destination should include the filename, not just the directory

set_permissions

</>

pub fn set_permissions(
  for_file_at filepath: String,
  to permissions: FilePermissions,
) -> Result(Nil, FileError)

Sets the permissions for a given file

Example

let all = set.from_list([Read, Write, Execute])
let all = FilePermissions(user: all, group: all, other: all)
let assert Ok(Nil) = set_permissions("./script.sh", all)

set_permissions_octal

</>

pub fn set_permissions_octal(
  for_file_at filepath: String,
  to permissions: Int,
) -> Result(Nil, FileError)

Sets the permissions for a given file using an octal representation

Example

set_permissions_octal("./script.sh", 0o777)

write

</>

pub fn write(
  to filepath: String,
  contents contents: String,
) -> Result(Nil, FileError)

Write a string to a file at the given path

Example

let assert Ok(Nil) = write(to: "./hello_world.txt", contents: "Hello, World!")

write_bits

</>

pub fn write_bits(
  to filepath: String,
  bits bits: BitArray,
) -> Result(Nil, FileError)

Write a bitstring to a file at the given path

Example

let assert Ok(Nil) = write_bits(to: "./hello_world.txt", bits: <<"Hello, World!":utf8>>)

Constructors

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