Struct path_abs::PathFile

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pub struct PathFile(_);

Expand description

a PathAbs that was a file at the time of initialization, with associated methods.

Implementations§

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impl PathFile

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pub fn new<P: AsRef<Path>>(path: P) -> Result<PathFile>

Instantiate a new PathFile. The file must exist or io::Error will be returned.

Returns io::ErrorKind::InvalidInput if the path exists but is not a file.

Examples

use path_abs::PathFile;

let lib = PathFile::new("src/lib.rs")?;

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pub fn new_unchecked<P: Into<Arc<PathBuf>>>(path: P) -> PathFile

Create a PathFile unchecked.

This is mostly used for constructing during tests, or if the path was previously validated. This is effectively the same as a Arc<PathBuf>.

Note: This is memory safe, so is not marked unsafe. However, it could cause panics in some methods if the path was not properly validated.

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pub fn try_from<P: Into<PathAbs>>(path: P) -> Result<PathFile>

Convert a PathAbs into a PathFile, first validating that the path is a file.

Error

If the path is not a file.

Examples

use path_abs::{PathAbs, PathFile};

let lib_abs = PathAbs::new("src/lib.rs")?;
let lib_file = PathFile::try_from(lib_abs)?;

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pub fn parent_dir(&self) -> PathDir

Get the parent directory of this file as a PathDir.

This does not make aditional syscalls, as the parent by definition must be a directory and exist.

Panics

Panics if there is no parent. The only way this could happen is if it was constructed with new_unchecked using a relative path.

Examples

use path_abs::{PathDir, PathFile};

let lib = PathFile::new("src/lib.rs")?;
let src = lib.parent_dir();
assert_eq!(PathDir::new("src")?, src);

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pub fn create<P: AsRef<Path>>(path: P) -> Result<PathFile>

Instantiate a new PathFile, creating an empty file if it doesn’t exist.

Examples

use path_abs::PathFile;

let example = "example.txt";


let file = PathFile::create(example)?;

// It can be done twice with no effect.
let _ = PathFile::create(example)?;

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pub fn read_string(&self) -> Result<String>

Read the entire contents of the file into a String.

Examples

use path_abs::PathFile;

let example = "example.txt";
let file = PathFile::create(example)?;

let expected = "foo\nbar";
file.write_str(expected)?;
assert_eq!(expected, file.read_string()?);

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pub fn write_str(&self, s: &str) -> Result<()>

Write the str to a file, truncating it first if it exists and creating it otherwise.

Examples

use path_abs::PathFile;

let example = "example.txt";
let file = PathFile::create(example)?;

let expected = "foo\nbar";
file.write_str(expected)?;
assert_eq!(expected, file.read_string()?);

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pub fn append_str(&self, s: &str) -> Result<()>

Append the str to a file, creating it if it doesn’t exist.

Examples

use path_abs::PathFile;

let example = "example.txt";
let file = PathFile::create(example)?;

let expected = "foo\nbar\nbaz";
file.append_str("foo\nbar")?;
file.append_str("\nbaz")?;
assert_eq!(expected, file.read_string()?);

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pub fn open_read(&self) -> Result<FileRead>

Open the file as read-only.

Examples

use std::io::Read;
use path_abs::PathFile;

let example = "example.txt";
let file = PathFile::create(example)?;

let expected = "foo\nbar";
file.write_str(expected)?;

let mut read = file.open_read()?;
let mut s = String::new();
read.read_to_string(&mut s)?;
assert_eq!(expected, s);

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pub fn open_append(&self) -> Result<FileWrite>

Open the file as write-only in append mode.

Examples

use std::io::Write;
use path_abs::PathFile;

let example = "example.txt";
let file = PathFile::create(example)?;

let expected = "foo\nbar\n";
file.write_str("foo\n")?;

let mut append = file.open_append()?;
append.write_all(b"bar\n")?;
append.flush();
assert_eq!(expected, file.read_string()?);

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pub fn open_edit(&self) -> Result<FileEdit>

Open the file for editing (reading and writing).

Examples

use std::io::{Read, Seek, Write, SeekFrom};
use path_abs::PathFile;

let example = "example.txt";
let file = PathFile::create(example)?;

let expected = "foo\nbar";

let mut edit = file.open_edit()?;
let mut s = String::new();

edit.write_all(expected.as_bytes())?;
edit.seek(SeekFrom::Start(0))?;
edit.read_to_string(&mut s)?;
assert_eq!(expected, s);

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pub fn copy<P: AsRef<Path>>(&self, path: P) -> Result<PathFile>

Copy the file to another location, including permission bits

Examples

use path_abs::PathFile;
use std::path::Path;

let example = "example.txt";
let example_bk = "example.txt.bk";
let file = PathFile::create(example)?;

let contents = "This is some contents";
file.write_str(contents);
let file_bk = file.copy(example_bk)?;
assert_eq!(contents, file.read_string()?);
assert_eq!(contents, file_bk.read_string()?);

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pub fn rename<P: AsRef<Path>>(self, to: P) -> Result<PathFile>

Rename a file, replacing the original file if to already exists.

This will not work if the new name is on a different mount point.

Examples

use path_abs::{PathFile, PathInfo};
use std::path::Path;

let example = "example.txt";
let example_bk = "example.txt.bk";
let file = PathFile::create(example)?;

let contents = "This is some contents";
file.write_str(contents);
let file_bk = file.clone().rename(example_bk)?;
assert!(!file.exists());
assert_eq!(contents, file_bk.read_string()?);

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pub fn symlink<P: AsRef<Path>>(&self, dst: P) -> Result<PathFile>

Creates a new symbolic link on the filesystem to the dst.

This handles platform specific behavior correctly.

Examples

use path_abs::PathFile;
use std::path::Path;

let example = "example.txt";
let example_sym = "example.txt.sym";
let file = PathFile::create(example)?;

let contents = "This is some contents";
file.write_str(contents);
let file_sym = file.symlink(example_sym)?;

// They have a different "absolute path"
assert_ne!(file, file_sym);

// But they can be canonicalized to the same file.
let file_can = file_sym.canonicalize()?;
assert_eq!(file, file_can);

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pub fn remove(self) -> Result<()>

Remove (delete) the file from the filesystem, consuming self.

Examples

use path_abs::{PathFile, PathInfo};
use std::path::Path;

let example = "example.txt";
let file = PathFile::create(example)?;
assert!(file.exists());
file.remove()?;

// file.exists() <--- COMPILER ERROR, `file` was consumed

assert!(!Path::new(example).exists());