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49 lines
1014 B
49 lines
1014 B
4 years ago
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## handling
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### Instructions
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Write a function, called `open_or_create` that as two arguments:
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- `file : &str` which is the name of the files
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- `content: &str` being the content to be written into the file
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This functions should try to open a file, if it does not exist creates it.
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You should panic, with the error, in case something goes wrong.
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### Expected Function
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```rust
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pub fn open_or_create(s: &str, content: &str) {}
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```
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### Usage
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Here is a program to test your function
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```rust
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fn main() {
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let path = "a.txt";
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File::create(path).unwrap();
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open_or_create(path, "content to be written");
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let mut file = File::open(path).unwrap();
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let mut s = String::new();
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file.read_to_string(&mut s).unwrap();
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println!("{}", s);
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}
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```
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And its output:
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```console
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student@ubuntu:~/[[ROOT]]/test$ cargo run
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content to be written
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student@ubuntu:~/[[ROOT]]/test$
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```
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### Notions
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- https://doc.rust-lang.org/std/io/enum.ErrorKind.html
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- https://doc.rust-lang.org/std/fs/struct.File.html
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