nexedit 0.2.2

A vim-like text editor, with simple shortcuts.
Documentation 
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use crate::view::terminal::{Cell, TerminalBufferIterator};
use scribe::buffer::Position;

pub struct TerminalBuffer<'c> {
    width: usize,
    height: usize,
    cells: Vec<Cell<'c>>,
}

impl<'c> TerminalBuffer<'c> {
    pub fn new(width: usize, height: usize) -> TerminalBuffer<'c> {
        TerminalBuffer {
            width,
            height,
            cells: vec![Cell::default(); width * height],
        }
    }

    pub fn set_cell(&mut self, position: Position, cell: Cell<'c>) {
        let index = position.line * self.width + position.offset;

        if index < self.cells.len() {
            self.cells[position.line * self.width + position.offset] = cell;
        }
    }

    pub fn clear(&mut self) {
        self.cells = vec![Cell::default(); self.width * self.height];
    }

    pub fn iter(&self) -> TerminalBufferIterator {
        TerminalBufferIterator::new(self.width, &self.cells)
    }

    #[cfg(test)]
    pub fn content(&self) -> String {
        let mut content = String::new();
        let mut line = 0;
        for (position, cell) in self.iter() {
            if position.line > line {
                content.push('\n');
                line += 1;
            }
            content.push_str(&*cell.content);
        }

        content
    }
}

#[cfg(test)]
mod tests {
    use super::TerminalBuffer;
    use crate::view::terminal::Cell;
    use crate::view::{Colors, Style};
    use scribe::buffer::Position;
    use std::borrow::Cow;

    #[test]
    fn new_sets_cell_capacity() {
        let width = 5;
        let height = 10;
        let buffer = TerminalBuffer::new(width, height);

        assert_eq!(50, buffer.cells.capacity());
    }

    #[test]
    fn new_sets_cell_defaults() {
        let width = 5;
        let height = 10;
        let buffer = TerminalBuffer::new(width, height);

        assert_eq!(buffer.cells[0], Cell::default());
    }

    #[test]
    fn set_cell_sets_correct_cell() {
        let mut buffer = TerminalBuffer::new(5, 10);
        let cell = Cell {
            content: Cow::from("a"),
            colors: Colors::Default,
            style: Style::Default,
        };
        buffer.set_cell(Position { line: 2, offset: 1 }, cell.clone());

        assert_eq!(buffer.cells[11], cell);
    }

    #[test]
    fn clear_resets_cells_to_default() {
        let mut buffer = TerminalBuffer::new(5, 10);
        let cell = Cell {
            content: Cow::from(" "),
            colors: Colors::Default,
            style: Style::Default,
        };
        buffer.set_cell(Position { line: 2, offset: 1 }, cell.clone());

        assert_eq!(buffer.cells[11], cell);
        buffer.clear();

        assert_eq!(buffer.cells[11], Cell::default());
    }
}