Struct file_ext::FileExt

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pub struct FileExt;

Implementations§

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impl FileExt

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pub fn read_file_partially(
 filepath: &str,
 start: u64,
 end: u64
) -> Result<Vec<u8>, String>

Returns portion of a file of specified range. Range described as starting from byte M up to byte N.

Examples

use file_ext::FileExt;
#[test]
fn partial_read() {
    let path = "test/index.html";
    let file_raw_bytes = FileExt::read_file_partially(path, 4, 10).unwrap();
    let content = String::from_utf8(file_raw_bytes).unwrap();

    let expected_content = "CTYPE h";

    assert_eq!(expected_content, content);
}

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pub fn read_file(filepath: &str) -> Result<Vec<u8>, String>

Returns file content

Examples

 use file_ext::FileExt;
 #[test]
 fn file_content() {
     let path = "test/index.html";
     let file_raw_bytes = FileExt::read_file(path).unwrap();
     let content = String::from_utf8(file_raw_bytes).unwrap();
  
     let content_escaped_newline_carriage_return = str::replace(content.as_str(), "\r\n", "\n");

     let expected_content = "<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n    <meta charset=\"UTF-8\">\n    <title>Title</title>\n</head>\n<body>\n\n</body>\n</html>";

     assert_eq!(expected_content, content_escaped_newline_carriage_return);
 }

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pub fn file_modified_utc(filepath: &str) -> Result<u128, String>

Returns file modification timestamp as nanoseconds in Unix epoch

Examples

 use std::{thread, time};
 use file_ext::FileExt;
 #[test]
 fn modification_timestamp() {

     let content = "data".as_bytes();
     let path = "modification_timestamp-test.content";

     FileExt::create_file(path).unwrap();
     FileExt::write_file(path, content).unwrap();

     let does_exist = FileExt::does_file_exist(path);
     assert!(does_exist);

     let modified_timestamp = FileExt::file_modified_utc(path).unwrap();

     let one_second = time::Duration::from_secs(1);
     thread::sleep(one_second);

     FileExt::write_file(path, "\nnewline and some data".as_bytes()).unwrap();

     let after_update_modified_timestamp = FileExt::file_modified_utc(path).unwrap();
     assert!(after_update_modified_timestamp > modified_timestamp);


     FileExt::delete_file(path).unwrap();
     let doesnt_exist = !FileExt::does_file_exist(path);
     assert!(doesnt_exist);
 }

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pub fn get_path_separator() -> String

Examples

use file_ext::FileExt;
#[test]
fn unix_path_delimiter() {
    let expected = SYMBOL.slash.to_string();
    let actual = FileExt::get_path_separator();
}

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pub fn get_static_filepath(path: &str) -> Result<String, String>

Will return absolute file path to the working directory

Examples

use file_ext::FileExt;
#[test]
fn absolute_path_to_working_directory() {
    let boxed_path = FileExt::get_static_filepath("");
    assert!(boxed_path.is_ok());
    let path = boxed_path.unwrap();
}

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pub fn read_or_create_and_write(
path: &str,
content: &[u8]
) -> Result<Vec<u8>, String>

Will try to read from file. If file does not exist, will create and write to it given byte array

Examples

 use file_ext::FileExt;
 #[test]
 fn read_or_create_and_write() {
     let content = "data".as_bytes();
     let tmp_folder = FileExt::get_temp_folder_path().unwrap();

     let path = [tmp_folder, "test.txt".to_string()].join(FileExt::get_path_separator().as_str());

     let doesnt_exist = !FileExt::does_file_exist(path.as_str());
     assert!(doesnt_exist);

     FileExt::read_or_create_and_write(path.as_str(), content).unwrap();

     let does_exist = FileExt::does_file_exist(path.as_str());
     assert!(does_exist);

     let new_content = "updated data".as_bytes();
     FileExt::read_or_create_and_write(path.as_str(), new_content).unwrap();

     let file_content = FileExt::read_file(path.as_str()).unwrap();
     assert_eq!(content, file_content);

     FileExt::delete_file(path.as_str()).unwrap();
     let doesnt_exist = !FileExt::does_file_exist(path.as_str());
     assert!(doesnt_exist);
 }

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pub fn create_file(path: &str) -> Result<(), String>

Will create a file on the path

Examples

use file_ext::FileExt;
#[test]
fn file_creation_deletion() {
    let path = "test/file-creation.txt";

    let exists = FileExt::does_file_exist(path);
    assert!(!exists);

    FileExt::create_file(path).unwrap();

    let content = FileExt::read_file(path).unwrap();
    assert_eq!(content.len(), 0);

    FileExt::delete_file(path).unwrap();

    let exists = FileExt::does_file_exist(path);
    assert!(!exists);
}

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pub fn does_file_exist(path: &str) -> bool

Returns boolean indicating file existence on the path

Examples

use file_ext::FileExt;
#[test]
fn file_exists() {
    let path = "test/index_rewrite";
    let exists = FileExt::does_file_exist(path);
    assert!(exists);
}

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pub fn does_directory_exist(path: &str) -> bool

Returns boolean indicating directory existence on the path

Examples

use file_ext::FileExt;
#[test]
fn directory_exists() {
    let path = "test";
    let exists = FileExt::does_directory_exist(path);
    assert!(exists);
}

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pub fn create_directory(path: &str) -> Result<(), String>

Will create a new directory on specified path

Examples

 use file_ext::FileExt;
 #[test]
 fn new_directory_create_delete() {
     let path = "new_directory";

     let boxed_create = FileExt::create_directory(path);
     assert!(boxed_create.is_ok());

     assert!(FileExt::does_directory_exist(path));

     let boxed_delete = FileExt::delete_directory(path);
     assert!(boxed_delete.is_ok());
 }

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pub fn delete_directory(path: &str) -> Result<(), String>

Will delete directory and all of the content on specified path (won’t follow symlinks)

Examples

 use file_ext::FileExt;
 #[test]
 fn new_directory_create_delete() {
     let path = "new_directory";

     let boxed_create = FileExt::create_directory(path);
     assert!(boxed_create.is_ok());

     assert!(FileExt::does_directory_exist(path));

     let boxed_delete = FileExt::delete_directory(path);
     assert!(boxed_delete.is_ok());
 }

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pub fn does_symlink_exist(path: &str) -> bool

Returns boolean indicating symlink existence on the path

Examples

use file_ext::FileExt;
#[test]
fn symlink_exists() {
  let symlink_path = ["test", "index-link2"].join(FileExt::get_path_separator().as_str());

  if FileExt::does_symlink_exist(symlink_path.as_str()) {
    FileExt::delete_file(symlink_path.as_str()).unwrap();
  }

  let path = [SYMBOL.empty_string, "test", SYMBOL.empty_string].join(FileExt::get_path_separator().as_str());
  let path_prefix = FileExt::get_static_filepath(path.as_str()).unwrap();
  let points_to = [path_prefix.to_string(), "index.html".to_string()].join("");

  let boxed_symlink = FileExt::create_symlink(
    path_prefix.as_str(),
    "index-link2",
    points_to.as_str()
  );


  assert!(boxed_symlink.is_ok());

  let symlink_created = FileExt::does_symlink_exist(symlink_path.as_str());
  assert!(symlink_created);

  let actual_points_to = FileExt::symlink_points_to(symlink_path.as_str()).unwrap();
  assert_eq!(points_to, actual_points_to);

  FileExt::delete_file(symlink_path.as_str()).unwrap();
}

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pub fn resolve_symlink_path(
symlink_directory: &str,
symlink_points_to: &str
) -> Result<String, String>

Returns absolute path, symlink points to. Takes 2 parameters: path to the directory, where symlink is located and where symlink points to

Examples

use file_ext::FileExt;
#[test]
fn resolve_symlink_path() {
   let base_dir = "/home/someuser/folder/subfolder/subsubfolder";
   let symlink_points_to = "../../subfolder2/subsubfolder2";

   let expected_path = "/home/someuser/folder/subfolder2/subsubfolder2";
   let actual_path = FileExt::resolve_symlink_path(base_dir, symlink_points_to).unwrap();

   assert_eq!(expected_path, actual_path);
}

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pub fn write_file(path: &str, file_content: &[u8]) -> Result<(), String>

Will write given byte array to a file on the path

Examples

 use file_ext::FileExt;
#[test]
 fn write() {
     let filename = "write-test.content";
     FileExt::create_file(filename).unwrap();

     let expected_content = "<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n    <meta charset=\"UTF-8\">\n    <title>Title</title>\n</head>\n<body>\n\n</body>\n</html>";
     FileExt::write_file(filename, expected_content.as_bytes()).unwrap();

     let actual = FileExt::read_file(filename).unwrap();
     assert_eq!(actual, expected_content.as_bytes());

 }

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pub fn delete_file(path: &str) -> Result<(), String>

Will delete file on a given path

Examples

use file_ext::FileExt;
#[test]
fn file_creation_deletion() {
    let path = "test/file-creation.txt";

    let exists = FileExt::does_file_exist(path);
    assert!(!exists);

    FileExt::create_file(path).unwrap();

    let content = FileExt::read_file(path).unwrap();
    assert_eq!(content.len(), 0);

    FileExt::delete_file(path).unwrap();

    let exists = FileExt::does_file_exist(path);
    assert!(!exists);
}

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pub fn create_symlink(
 symlink_path: &str,
 symlink_name: &str,
 symlink_points_to: &str
) -> Result<(), String>

Will create symlink on path symlink_path with the specified name symlink_name. Symlink will point to specific file or directory symlink_points_to. Paths are absolute.

Examples

use file_ext::FileExt;
#[test]
fn symlink_creation() {
   let symlink_path = "test/index-link";

   if FileExt::does_symlink_exist(symlink_path) {
       FileExt::delete_file(symlink_path).unwrap();
   }

   let path_prefix = FileExt::get_static_filepath("/test/").unwrap();
   let points_to = [path_prefix.to_string(), "index.html".to_string()].join("");

   let boxed_symlink = FileExt::create_symlink(
       path_prefix.as_str(),
       "index-link",
       points_to.as_str());

    assert!(boxed_symlink.is_ok());

    let symlink_created = FileExt::does_symlink_exist(symlink_path);
    assert!(symlink_created);

    let actual_points_to = FileExt::symlink_points_to(symlink_path).unwrap();
    assert_eq!(points_to, actual_points_to);

    FileExt::delete_file(symlink_path).unwrap();
}

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pub fn is_symlink(path: &str) -> Result<bool, String>

Checks if the file is symlink

Examples

use file_ext::FileExt;
#[test]
fn is_link() {
    let path: String = ["test", "index_rewrite"].join(&FileExt::get_path_separator());
    let is_symlink = FileExt::is_symlink(path.as_str()).unwrap();
    assert!(is_symlink);
}

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pub fn symlink_points_to(path: &str) -> Result<String, String>

Returns path to a file, symlink points to

Examples

use file_ext::FileExt;
#[test]
fn link_points_to() {
    let path: String = ["test", "index_rewrite"].join(&FileExt::get_path_separator());
    let points_to = FileExt::symlink_points_to(path.as_str()).unwrap();
    assert_eq!("index.html", points_to);
}

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pub fn build_path(list: &[&str]) -> String

Builds a path from a given node list

Examples

use file_ext::FileExt;

#[test]
#[cfg(target_family = "unix")]
fn build_path() {
    let root = FileExt::root();
    let folder_up = FileExt::folder_up();

    let node_list =
        [
            root.as_str(),
            "home",
            "someuser",
            "folder",
            "subfolder",
            "subsubfolder",
        ];

    let another_node_list =
        [
            folder_up.as_str(),
            folder_up.as_str(),
            "subfolder2",
            "subsubfolder2",
        ];
    let path = PathExtImpl::build_path(&node_list);
    let another_path = PathExtImpl::build_path(&another_node_list);

    assert_eq!("/home/someuser/folder/subfolder/subsubfolder", path);
    assert_eq!("../../subfolder2/subsubfolder2", another_path);
}


#[test]
#[cfg(target_family = "windows")]
fn build_path() {
    let root = FileExt::root();
    let folder_up = FileExt::folder_up();

    let node_list =
        [
            root.as_str(),
            "Users",
            "someuser",
            "folder",
            "subfolder",
            "subsubfolder",
        ];

    let path = PathExtImpl::build_path(&node_list);

    assert_eq!("C:\\Users\\someuser\\folder\\subfolder\\subsubfolder", path);
}

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pub fn root() -> String

Root node of the system. It is meant to be used in build_path function. On Linux and macOS build_path function will evaluate it to /, on Windows it will be C:

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pub fn folder_up() -> String

Folder up, or ... It is meant to be used in build_path function.

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pub fn get_current_user() -> Result<String, String>

Returns name of the user running the process

Examples

 use file_ext::FileExt;
 #[test]
 #[cfg(target_family = "unix")]
 fn current_user() {
     let boxed_user = FileExt::get_current_user();
     assert!(boxed_user.is_ok());

     let user = boxed_user.unwrap();
 }

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pub fn get_temp_folder_path() -> Result<String, String>

Returns path to the temporary folder

Examples

 use file_ext::FileExt;
 #[test]
 #[cfg(target_family = "unix")]
 fn temp_folder() {
     let temp_folder_path = FileExt::get_temp_folder_path().unwrap();
     assert_eq!(temp_folder_path, "/tmp")
 }