aopt-help 0.3.7

Generate help message for command line program
Documentation 
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use crate::style::{Align, Style};
use std::borrow::Cow;
use textwrap::{core::display_width, wrap};

#[derive(Debug, Default)]
pub struct Wrapped<'a> {
    cows: Vec<Cow<'a, str>>,

    style: Style,
}

impl<'a> Wrapped<'a> {
    pub fn new(cows: Vec<Cow<'a, str>>, style: Style) -> Self {
        Self { cows, style }
    }

    pub fn get_style(&self) -> &Style {
        &self.style
    }

    pub fn set_wrap_width(&mut self, width: usize) {
        self.style.wrap_width = width;
    }

    pub fn get_wrap_width(&self) -> usize {
        self.style.wrap_width
    }

    pub fn get_line(&self, line: usize) -> String {
        let padding_str = String::from(self.style.padding_char);

        if line < self.cows.len() {
            let mut ret = " ".repeat(self.style.indent);
            let real_width = display_width(self.cows[line].as_ref());
            let padding_width = self.get_wrap_width() - real_width;

            ret += self.cows[line].as_ref();
            match self.style.align {
                Align::Left => {
                    ret += &padding_str.repeat(padding_width);
                }
                Align::Right => {
                    ret = padding_str.repeat(padding_width) + &ret;
                }
            }
            ret
        } else {
            format!(
                "{}{}",
                " ".repeat(self.style.indent),
                padding_str.repeat(self.get_wrap_width())
            )
        }
    }

    pub fn len(&self) -> usize {
        self.cows.len()
    }

    pub fn is_empty(&self) -> bool {
        self.len() == 0
    }
}

#[derive(Debug)]
pub struct Wrapper<'a, 'b> {
    data: &'a [Vec<Cow<'b, str>>],

    output: Vec<Vec<Wrapped<'b>>>,
}

impl<'a, 'b> Wrapper<'a, 'b>
where
    'a: 'b,
{
    pub fn new(data: &'a [Vec<Cow<'b, str>>]) -> Self {
        Self {
            data,
            output: vec![],
        }
    }

    pub fn wrap(&mut self, max_width: usize) {
        let data_len = self.data.iter().map(|v| v.len()).max().unwrap_or(0);
        let mut default_style = vec![Style::default(); data_len];

        for line in self.data.iter() {
            for (style_mut, col) in default_style.iter_mut().zip(line.iter()) {
                let width = display_width(col);

                if style_mut.wrap_width < width {
                    style_mut.wrap_width = if max_width != 0 && width > max_width {
                        max_width
                    } else {
                        width
                    };
                }
            }
        }

        for line in self.data.iter() {
            let mut wrapped = vec![];

            for (col, style) in line.iter().zip(default_style.iter()) {
                wrapped.push(Wrapped::new(wrap(col, style.wrap_width), style.clone()));
            }

            self.output.push(wrapped);
        }
    }

    /// Modify wrap_width if wrap_width is 0
    pub fn wrap_with(&mut self, styles: &[Style], max_width: usize) {
        let mut styles = styles.to_owned();
        let status: Vec<bool> = styles.iter().map(|v| v.wrap_width == 0).collect();

        for (line, status) in self.data.iter().zip(status.iter()) {
            if *status {
                for (style_mut, col) in styles.iter_mut().zip(line.iter()) {
                    let width = display_width(col);

                    if style_mut.wrap_width < width {
                        style_mut.wrap_width = if max_width != 0 && width > max_width {
                            max_width
                        } else {
                            width
                        };
                    }
                }
            }
        }

        for line in self.data.iter() {
            let mut wrapped = vec![];

            for (col, style) in line.iter().zip(styles.iter()) {
                wrapped.push(Wrapped::new(wrap(col, style.wrap_width), style.clone()));
            }
            self.output.push(wrapped);
        }
    }

    pub fn get_output(&self) -> &Vec<Vec<Wrapped<'b>>> {
        &self.output
    }

    pub fn len(&self) -> usize {
        self.output.len()
    }

    pub fn is_empty(&self) -> bool {
        self.len() == 0
    }
}