cfun/
c_file.rs

1use std::{io, path::Path};
2
3/// judge whether a file is exists
4pub fn file_is_exist(file: &str) -> bool {
5    let file = std::fs::metadata(file);
6    file.is_ok_and(|f| f.is_file())
7}
8
9/// judge whether a file is exists
10pub fn dir_is_exist(file: &str) -> bool {
11    let file = std::fs::metadata(file);
12    file.is_ok_and(|f| f.is_dir())
13}
14
15/// get file name of a path
16pub fn file_name(path: &str) -> String {
17    let p = Path::new(path);
18    p.file_name()
19        .unwrap_or_default()
20        .to_string_lossy()
21        .to_string()
22}
23
24/// get extension name of a file
25pub fn file_ext(path: &str) -> String {
26    let p = Path::new(path);
27    p.extension()
28        .unwrap_or_default()
29        .to_string_lossy()
30        .to_string()
31}
32
33/// ensure a file exist,if not exist,create it!
34/// # example
35/// ```
36/// assert_eq!(true,ensure_file_exist("D:\\a\\b\\test.txt"));
37/// ```
38pub fn ensure_file_exist(file: &str) -> Result<(), io::Error> {
39    let p = std::path::Path::new(file);
40    let parent = p.parent();
41    if let Some(parent) = parent {
42        if !parent.exists() {
43            std::fs::create_dir_all(parent)?;
44        }
45    };
46
47    if !p.exists() || !p.is_file() {
48        std::fs::File::create(p)?;
49    }
50    Ok(())
51}
52
53/// copy a file to new position
54/// # example
55/// ```
56/// copy_file("test.txt","D:\\");
57/// ```
58pub fn copy_file(src_file: &str, des_dir: &str) -> Result<(), io::Error> {
59    let mut src = std::fs::File::open(src_file)?;
60    let name = file_name(src_file);
61    let p = Path::new(des_dir);
62    let p = p.join(name);
63    let mut des = std::fs::File::create(p)?;
64    std::io::copy(&mut src, &mut des)?;
65    Ok(())
66}
67/// copy a file to new position
68/// # example
69/// ```
70/// move_file("test.txt","D:\\test.txt");
71/// ```
72pub fn move_file(src: &str, des: &str) -> Result<(), io::Error> {
73    std::fs::rename(src, des)?;
74    Ok(())
75}
76
77/// get file size
78/// # example
79/// ```
80/// let size=file_size("test.txt");
81/// ```
82pub fn file_size(file: &str) -> Result<u64, io::Error> {
83    let metadata = std::fs::metadata(file)?;
84    Ok(metadata.len())
85}
86
87#[test]
88fn test_file_is_exist() {
89    assert_eq!(true, file_is_exist("Cargo.toml"));
90    assert_eq!(false, file_is_exist("Cargo.toml1"));
91}
92
93#[test]
94fn test_dir_is_exist() {
95    assert_eq!(true, dir_is_exist("src"));
96    assert_eq!(false, dir_is_exist("src1"));
97}
98
99#[test]
100fn test_file_name() {
101    assert_eq!("Cargo.toml", file_name("Cargo.toml"));
102    assert_eq!("Cargo", file_name("Cargo"));
103}
104
105#[test]
106fn test_file_ext() {
107    assert_eq!("toml", file_ext("Cargo.toml"));
108    assert_eq!("", file_ext("Cargo"));
109}
110
111#[test]
112fn test_ensure_file_exist() {
113    assert_eq!(true, ensure_file_exist("D:\\a\\b\\test.txt").is_ok());
114}
115
116#[test]
117fn test_copy_file() {
118    assert_eq!(true, copy_file("Cargo.toml", ".\\target").is_ok());
119}
cfun/c_file.rs

cfun/
c_file.rs
