manatsu 0.6.8

CLI tools for Manatsu
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134

use super::hsl::Hsl;
use super::rgb::Rgb;
use super::Color;
use crate::prelude::*;
use std::fmt;

/// <https://regex101.com/r/OKsEXy>
const HEX_REGEX: &str = r"#?([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})?";

/// Represents a hex color.
#[derive(Clone, Deserialize, Serialize)]
pub struct Hex {
  pub r: u8,
  pub g: u8,
  pub b: u8,
  pub a: Option<f64>,
}

impl Color for Hex {
  /// Generate a random hex color.
  fn random() -> Self {
    Rgb::random().into()
  }

  /// Generate a random hex color with an alpha value.
  fn random_with_alpha() -> Self {
    Rgb::random_with_alpha().into()
  }
}

impl From<Rgb> for Hex {
  fn from(rgb: Rgb) -> Self {
    Self {
      r: rgb.r,
      g: rgb.g,
      b: rgb.b,
      a: rgb.a,
    }
  }
}

impl From<Hsl> for Hex {
  fn from(hsl: Hsl) -> Self {
    Self::from(Rgb::from(hsl))
  }
}

impl TryFrom<&str> for Hex {
  type Error = anyhow::Error;

  fn try_from(value: &str) -> Result<Self, Self::Error> {
    let value = value.trim();
    let err = || anyhow!("{value} is not a valid hex color");

    let hex_regex = Regex::new(HEX_REGEX).expect("hardcoded regex should be valid");
    let caps = hex_regex.captures(value).ok_or_else(err)?;

    macro_rules! to_u8 {
      ($index:literal) => {{
        caps
          .get($index)
          .map(|m| u8::from_str_radix(m.as_str(), 16).ok())
          .flatten()
          .ok_or_else(err)
      }};
    }

    let r = to_u8!(1)?;
    let g = to_u8!(2)?;
    let b = to_u8!(3)?;
    let a = to_u8!(4).ok().map(|a| f64::from(a) / 255.0);

    Ok(Hex { r, g, b, a })
  }
}

impl From<Hex> for String {
  fn from(hex: Hex) -> Self {
    let mut result = format!("#{:02x}{:02x}{:02x}", hex.r, hex.g, hex.b);

    if let Some(a) = hex.a {
      let a = (a * 255.0) as u8;
      let a = format!("{a:02x}");
      result.push_str(&a);
    }

    result
  }
}

impl fmt::Display for Hex {
  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
    write!(f, "{}", self.clone())
  }
}

#[cfg(test)]
mod tests {
  use super::*;
  use crate::color::Color;
  use regex::Regex;

  #[test]
  fn should_generate_random_hex() {
    let regex = Regex::new(HEX_REGEX).unwrap();
    let hex = String::from(Hex::random());
    assert!(regex.is_match(&hex));
  }

  #[test]
  fn should_generate_random_hex_with_alpha() {
    let regex = Regex::new(HEX_REGEX).unwrap();
    let hex = String::from(Hex::random_with_alpha());
    assert!(regex.is_match(&hex));
  }

  #[test]
  fn should_convert_string_to_hex() {
    let hex = Hex::try_from("#ff00ff").unwrap();
    assert_eq!(hex.r, 255);
    assert_eq!(hex.g, 0);
    assert_eq!(hex.b, 255);
    assert!(hex.a.is_none());
  }

  #[test]
  fn should_convert_string_to_hex_with_alpha() {
    let hex = Hex::try_from("#ff00ffaa").unwrap();
    assert_eq!(hex.r, 255);
    assert_eq!(hex.g, 0);
    assert_eq!(hex.b, 255);
    assert!(hex.a.is_some());
  }
}