scribe 0.7.0

Text editor toolkit.
Documentation 
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/// A vector value representing a span in a buffer. Unlike the
/// Range type, whose two positions are absolutes, a Distance
/// is meant to be used relative to a Position.
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct Distance {
    pub lines: usize,
    pub offset: usize,
}

impl Distance {
    /// Calculates the distance covered by a string. The
    /// offset is calculated from the last line of the string.
    ///
    /// # Examples
    ///
    /// ```
    /// use scribe::buffer::Distance;
    ///
    /// let data = "scribe\ndistance";
    /// assert_eq!(Distance::from_str(data), Distance{
    ///     lines: 1,
    ///     offset: 8
    /// });
    /// ```
    pub fn from_str(from: &str) -> Distance {
        Distance{
            lines: from.chars().filter(|&c| c == '\n').count(),
            offset: from.split('\n').last().map(|l| l.len()).unwrap_or(0)
        }
    }
}

#[cfg(test)]
mod tests {
    use super::Distance;

    #[test]
    fn from_str_works_with_a_single_line_of_data() {
        assert_eq!(Distance::from_str("line"), Distance{
            lines: 0,
            offset: 4
        });
    }

    #[test]
    fn from_str_works_with_a_trailing_newline() {
        assert_eq!(Distance::from_str("trailing newline\n"), Distance{
            lines: 1,
            offset: 0
        });
    }
}