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/// Clap validators module
///
/// Used for validating different CLI args (like width, height and delay)
/// Ref: https://docs.rs/clap/3.0.0-beta.2/clap/struct.Arg.html#method.validator
pub(crate) mod validators {
use terminal_size::{terminal_size, Height, Width};
/// Validator to check if width configuration can be used
///
/// The maximum width allowed is the current terminal window width
pub(crate) fn is_fitting_term_width(val: &str) -> Result<(), String> {
let (Width(term_width), Height(_)) = terminal_size().unwrap();
match val.parse::<u16>() {
Ok(n) if n > 0 && n <= term_width => Ok(()),
Ok(_) => Err(format!(
"must be between 1 and {} (current terminal width)",
term_width
)),
Err(e) => Err(e.to_string()),
}
}
/// Validator to check if height configuration can be used
///
/// The maximum height allowed is the current terminal window height - 2
/// The last 2 lines are used for status reporting (seed/input) and space
/// for ease of use
pub(crate) fn is_fitting_term_height(val: &str) -> Result<(), String> {
let (Width(_), Height(term_height)) = terminal_size().unwrap();
let term_height = term_height - 2;
match val.parse::<u16>() {
Ok(n) if n > 0 && n <= term_height => Ok(()),
Ok(_) => Err(format!(
"must be between 1 and {} (current terminal height)",
term_height
)),
Err(e) => Err(e.to_string()),
}
}
/// Validator to check if delay value is positive
pub(crate) fn is_positive(val: &str) -> Result<(), String> {
match val.parse::<i16>() {
Ok(n) if n.is_positive() => Ok(()),
Ok(_) => Err(String::from("must be postive value (so far)")),
Err(e) => Err(e.to_string()),
}
}
#[cfg(test)]
mod is_positive {
use super::*;
#[test]
fn positive_value() {
assert!(is_positive("1337").is_ok());
}
#[test]
fn negative_value() {
assert!(is_positive("-1337").is_err());
}
#[test]
fn string_value() {
assert!(is_positive("not a number").is_err());
}
}
}
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