mprocs-vt100 0.1.0

Fork of vt100 for mprocs
Documentation 
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use crate::term::BufWrite as _;

/// Represents a foreground or background color for cells.
#[derive(Eq, PartialEq, Debug, Copy, Clone)]
pub enum Color {
  /// The default terminal color.
  Default,

  /// An indexed terminal color.
  Idx(u8),

  /// An RGB terminal color. The parameters are (red, green, blue).
  Rgb(u8, u8, u8),
}

impl Default for Color {
  fn default() -> Self {
    Self::Default
  }
}

const TEXT_MODE_BOLD: u8 = 0b0000_0001;
const TEXT_MODE_ITALIC: u8 = 0b0000_0010;
const TEXT_MODE_UNDERLINE: u8 = 0b0000_0100;
const TEXT_MODE_INVERSE: u8 = 0b0000_1000;

#[derive(Default, Clone, Copy, PartialEq, Eq, Debug)]
pub struct Attrs {
  pub fgcolor: Color,
  pub bgcolor: Color,
  pub mode: u8,
}

impl Attrs {
  pub fn bold(&self) -> bool {
    self.mode & TEXT_MODE_BOLD != 0
  }

  pub fn set_bold(&mut self, bold: bool) {
    if bold {
      self.mode |= TEXT_MODE_BOLD;
    } else {
      self.mode &= !TEXT_MODE_BOLD;
    }
  }

  pub fn italic(&self) -> bool {
    self.mode & TEXT_MODE_ITALIC != 0
  }

  pub fn set_italic(&mut self, italic: bool) {
    if italic {
      self.mode |= TEXT_MODE_ITALIC;
    } else {
      self.mode &= !TEXT_MODE_ITALIC;
    }
  }

  pub fn underline(&self) -> bool {
    self.mode & TEXT_MODE_UNDERLINE != 0
  }

  pub fn set_underline(&mut self, underline: bool) {
    if underline {
      self.mode |= TEXT_MODE_UNDERLINE;
    } else {
      self.mode &= !TEXT_MODE_UNDERLINE;
    }
  }

  pub fn inverse(&self) -> bool {
    self.mode & TEXT_MODE_INVERSE != 0
  }

  pub fn set_inverse(&mut self, inverse: bool) {
    if inverse {
      self.mode |= TEXT_MODE_INVERSE;
    } else {
      self.mode &= !TEXT_MODE_INVERSE;
    }
  }

  pub fn write_escape_code_diff(&self, contents: &mut Vec<u8>, other: &Self) {
    if self != other && self == &Self::default() {
      crate::term::ClearAttrs::default().write_buf(contents);
      return;
    }

    let attrs = crate::term::Attrs::default();

    let attrs = if self.fgcolor == other.fgcolor {
      attrs
    } else {
      attrs.fgcolor(self.fgcolor)
    };
    let attrs = if self.bgcolor == other.bgcolor {
      attrs
    } else {
      attrs.bgcolor(self.bgcolor)
    };
    let attrs = if self.bold() == other.bold() {
      attrs
    } else {
      attrs.bold(self.bold())
    };
    let attrs = if self.italic() == other.italic() {
      attrs
    } else {
      attrs.italic(self.italic())
    };
    let attrs = if self.underline() == other.underline() {
      attrs
    } else {
      attrs.underline(self.underline())
    };
    let attrs = if self.inverse() == other.inverse() {
      attrs
    } else {
      attrs.inverse(self.inverse())
    };

    attrs.write_buf(contents);
  }
}