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use ratatui::{
style::{
Color,
Modifier,
Style,
},
text::Span,
};
pub fn ansi_spans(s: &str) -> Vec<Span<'_>>
{
let bytes = s.as_bytes();
let mut spans: Vec<Span> = Vec::new();
let mut style = Style::default();
let mut i: usize = 0;
let mut seg_start: usize = 0;
while i < bytes.len()
{
if bytes[i] == 0x1B && i + 1 < bytes.len()
{
if seg_start < i
&& let Some(seg) = s.get(seg_start..i)
{
spans.push(Span::styled(seg.to_string(), style));
}
match bytes[i + 1]
{
b'[' =>
{
i += 2;
let start = i;
while i < bytes.len()
&& !(bytes[i] >= 0x40 && bytes[i] <= 0x7E)
{
i += 1;
}
if i >= bytes.len()
{
break;
}
let finalb = bytes[i];
let params = &s[start..i];
if finalb == b'm'
{
apply_sgr_seq(params, &mut style);
}
i += 1;
seg_start = i;
}
b']' =>
{
i += 2;
loop
{
if i >= bytes.len()
{
break;
}
if bytes[i] == 0x07
{
i += 1;
break;
}
if bytes[i] == 0x1B
&& i + 1 < bytes.len()
&& bytes[i + 1] == b'\\'
{
i += 2;
break;
}
i += 1;
}
seg_start = i;
}
b'(' | b')' | b'*' | b'+' =>
{
i += 3;
seg_start = i;
}
_ =>
{
i += 2;
seg_start = i;
}
}
}
else if bytes[i] == b'\r'
{
i += 1;
seg_start = i;
}
else
{
i += 1;
}
}
if seg_start < bytes.len()
&& let Some(seg) = s.get(seg_start..bytes.len())
{
spans.push(Span::styled(seg.to_string(), style));
}
spans
}
fn apply_sgr_seq(
seq: &str,
style: &mut Style,
)
{
let nums: Vec<i32> =
seq.split(';').filter_map(|t| t.parse::<i32>().ok()).collect();
if nums.is_empty()
{
*style = Style::default();
return;
}
let mut i = 0;
while i < nums.len()
{
match nums[i]
{
0 =>
{
*style = Style::default();
}
1 =>
{
*style = style.add_modifier(Modifier::BOLD);
}
3 =>
{
*style = style.add_modifier(Modifier::ITALIC);
}
4 =>
{
*style = style.add_modifier(Modifier::UNDERLINED);
}
22 =>
{
*style = style.remove_modifier(Modifier::BOLD);
}
23 =>
{
*style = style.remove_modifier(Modifier::ITALIC);
}
24 =>
{
*style = style.remove_modifier(Modifier::UNDERLINED);
}
30..=37 =>
{
style.fg = Some(basic_color((nums[i] - 30) as u8, false));
}
90..=97 =>
{
style.fg = Some(basic_color((nums[i] - 90) as u8, true));
}
40..=47 =>
{
style.bg = Some(basic_color((nums[i] - 40) as u8, false));
}
100..=107 =>
{
style.bg = Some(basic_color((nums[i] - 100) as u8, true));
}
38 if i + 1 < nums.len() => match nums[i + 1]
{
5 if i + 2 < nums.len() =>
{
style.fg = Some(Color::Indexed(nums[i + 2] as u8));
i += 2;
}
5 =>
{}
2 if i + 4 < nums.len() =>
{
style.fg = Some(Color::Rgb(
nums[i + 2] as u8,
nums[i + 3] as u8,
nums[i + 4] as u8,
));
i += 4;
}
_ =>
{}
},
38 =>
{}
48 if i + 1 < nums.len() => match nums[i + 1]
{
5 if i + 2 < nums.len() =>
{
style.bg = Some(Color::Indexed(nums[i + 2] as u8));
i += 2;
}
5 =>
{}
2 if i + 4 < nums.len() =>
{
style.bg = Some(Color::Rgb(
nums[i + 2] as u8,
nums[i + 3] as u8,
nums[i + 4] as u8,
));
i += 4;
}
_ =>
{}
},
_ =>
{}
}
i += 1;
}
}
fn basic_color(
code: u8,
bright: bool,
) -> Color
{
match (code, bright)
{
(0, false) => Color::Black,
(1, false) => Color::Red,
(2, false) => Color::Green,
(3, false) => Color::Yellow,
(4, false) => Color::Blue,
(5, false) => Color::Magenta,
(6, false) => Color::Cyan,
(7, false) => Color::Gray,
(0, true) => Color::DarkGray,
(1, true) => Color::LightRed,
(2, true) => Color::LightGreen,
(3, true) => Color::LightYellow,
(4, true) => Color::LightBlue,
(5, true) => Color::LightMagenta,
(6, true) => Color::LightCyan,
(7, true) => Color::White,
_ => Color::White,
}
}