opaline 0.4.1

A token-based theme engine for Rust applications
Documentation 
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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157

//! Crossterm adapter — direct terminal styling without ratatui.
//!
//! Provides `From` conversions for `OpalineColor` → [`Color`] and
//! `OpalineStyle` → [`ContentStyle`], plus gradient helpers that produce
//! [`StyledContent`] sequences for per-character gradient rendering.
//!
//! ```rust,ignore
//! use crossterm::style::{ContentStyle, Stylize};
//! use opaline::{Theme, OpalineColor};
//!
//! let theme = Theme::default();
//! let style = ContentStyle::from(theme.style("keyword"));
//! print!("{}", style.apply("fn"));
//! ```

use std::fmt::Display;

use crossterm::style::{Attribute, Color, ContentStyle, StyledContent};

use crate::color::OpalineColor;
#[cfg(feature = "gradients")]
use crate::gradient::Gradient;
use crate::style::OpalineStyle;
use crate::theme::Theme;
#[cfg(feature = "gradients")]
use unicode_segmentation::UnicodeSegmentation;

// ═══════════════════════════════════════════════════════════════════════════════
// Color conversion
// ═══════════════════════════════════════════════════════════════════════════════

impl From<OpalineColor> for Color {
    fn from(c: OpalineColor) -> Self {
        Color::Rgb {
            r: c.r,
            g: c.g,
            b: c.b,
        }
    }
}

impl From<&OpalineColor> for Color {
    fn from(c: &OpalineColor) -> Self {
        Color::Rgb {
            r: c.r,
            g: c.g,
            b: c.b,
        }
    }
}

// ═══════════════════════════════════════════════════════════════════════════════
// Style conversion
// ═══════════════════════════════════════════════════════════════════════════════

impl From<OpalineStyle> for ContentStyle {
    fn from(s: OpalineStyle) -> Self {
        let mut style = Self::new();

        style.foreground_color = s.fg.map(Into::into);
        style.background_color = s.bg.map(Into::into);

        if s.bold {
            style.attributes.set(Attribute::Bold);
        }
        if s.dim {
            style.attributes.set(Attribute::Dim);
        }
        if s.italic {
            style.attributes.set(Attribute::Italic);
        }
        if s.underline {
            style.attributes.set(Attribute::Underlined);
        }
        if s.slow_blink {
            style.attributes.set(Attribute::SlowBlink);
        }
        if s.rapid_blink {
            style.attributes.set(Attribute::RapidBlink);
        }
        if s.reversed {
            style.attributes.set(Attribute::Reverse);
        }
        if s.hidden {
            style.attributes.set(Attribute::Hidden);
        }
        if s.crossed_out {
            style.attributes.set(Attribute::CrossedOut);
        }

        style
    }
}

impl From<&OpalineStyle> for ContentStyle {
    fn from(s: &OpalineStyle) -> Self {
        s.clone().into()
    }
}

// ═══════════════════════════════════════════════════════════════════════════════
// Theme helpers
// ═══════════════════════════════════════════════════════════════════════════════

impl Theme {
    /// Apply a named style to content, producing a crossterm [`StyledContent`].
    pub fn crossterm_styled<D: Display>(&self, style_name: &str, content: D) -> StyledContent<D> {
        ContentStyle::from(self.style(style_name)).apply(content)
    }
}

// ═══════════════════════════════════════════════════════════════════════════════
// Gradient helpers
// ═══════════════════════════════════════════════════════════════════════════════

/// Render a string with per-character gradient coloring as crossterm
/// [`StyledContent`] values. Each element implements `Display`.
#[cfg(feature = "gradients")]
pub fn gradient_styled(text: &str, gradient: &Gradient) -> Vec<StyledContent<String>> {
    let graphemes: Vec<&str> = text.graphemes(true).collect();
    if graphemes.is_empty() {
        return vec![];
    }

    let colors = gradient.generate(graphemes.len());
    graphemes
        .into_iter()
        .zip(colors)
        .map(|(grapheme, color)| {
            let style = ContentStyle {
                foreground_color: Some(color.into()),
                ..ContentStyle::new()
            };
            style.apply(grapheme.to_string())
        })
        .collect()
}

/// Render a repeated character across `width` with gradient coloring.
#[cfg(feature = "gradients")]
pub fn gradient_bar(width: usize, ch: char, gradient: &Gradient) -> Vec<StyledContent<String>> {
    if width == 0 {
        return vec![];
    }

    let colors = gradient.generate(width);
    colors
        .into_iter()
        .map(|color| {
            let style = ContentStyle {
                foreground_color: Some(color.into()),
                ..ContentStyle::new()
            };
            style.apply(ch.to_string())
        })
        .collect()
}