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extern crate base64;
extern crate rusttype;
use base64::display::Base64Display;
use rusttype::{Font, FontCollection, Scale, point, Point, PositionedGlyph};
const FONT_DATA: &'static [u8] = include_bytes!(concat!(env!("CARGO_MANIFEST_DIR"),
"/DejaVuSans.ttf"));
const FONT_SIZE: f32 = 11.;
pub struct BadgeOptions {
pub subject: String,
pub status: String,
pub color: String,
}
impl Default for BadgeOptions {
fn default() -> BadgeOptions {
BadgeOptions {
subject: "build".to_owned(),
status: "passing".to_owned(),
color: "#4c1".to_owned(),
}
}
}
pub struct Badge {
options: BadgeOptions,
font: Font<'static>,
scale: Scale,
offset: Point<f32>,
}
impl Badge {
pub fn new(options: BadgeOptions) -> Result<Badge, String> {
let collection = FontCollection::from_bytes(FONT_DATA);
let font = try!(collection.into_font().ok_or("Failed to load font data".to_owned()));
let scale = Scale {
x: FONT_SIZE,
y: FONT_SIZE,
};
let v_metrics = font.v_metrics(scale);
let offset = point(0.0, v_metrics.ascent);
Ok(Badge {
options: options,
font: font,
scale: scale,
offset: offset,
})
}
pub fn to_svg_data_uri(&self) -> String {
format!("data:image/svg+xml;base64,{}",
Base64Display::standard(self.to_svg().as_bytes()))
}
pub fn to_svg(&self) -> String {
let left_width = self.calculate_width(&self.options.subject) + 6;
let right_width = self.calculate_width(&self.options.status) + 6;
let svg = format!(r###"<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="{}" height="20">
<linearGradient id="smooth" x2="0" y2="100%">
<stop offset="0" stop-color="#bbb" stop-opacity=".1"/>
<stop offset="1" stop-opacity=".1"/>
</linearGradient>
<mask id="round">
<rect width="{}" height="20" rx="3" fill="#fff"/>
</mask>
<g mask="url(#round)">
<rect width="{}" height="20" fill="#555"/>
<rect x="{}" width="{}" height="20" fill="{}"/>
<rect width="{}" height="20" fill="url(#smooth)"/>
</g>
<g fill="#fff" text-anchor="middle" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="11">
<text x="{}" y="15" fill="#010101" fill-opacity=".3">{}</text>
<text x="{}" y="14">{}</text>
<text x="{}" y="15" fill="#010101" fill-opacity=".3">{}</text>
<text x="{}" y="14">{}</text>
</g>
</svg>"###,
left_width + right_width,
left_width + right_width,
left_width,
left_width,
right_width,
self.options.color,
left_width + right_width,
(left_width) / 2,
self.options.subject,
(left_width) / 2,
self.options.subject,
left_width + (right_width / 2),
self.options.status,
left_width + (right_width / 2),
self.options.status);
svg
}
fn calculate_width(&self, text: &str) -> u32 {
let glyphs: Vec<PositionedGlyph> =
self.font.layout(text, self.scale, self.offset).collect();
let width: u32 = glyphs.iter()
.rev()
.filter_map(|g| {
g.pixel_bounding_box()
.map(|b| b.min.x as f32 + g.unpositioned().h_metrics().advance_width)
})
.next()
.unwrap_or(0.0)
.ceil() as u32;
width + ((text.len() as u32 - 1) * 2)
}
}
#[cfg(test)]
mod tests {
use super::*;
fn options() -> BadgeOptions {
BadgeOptions::default()
}
#[test]
fn test_new() {
assert!(Badge::new(options()).is_ok());
}
#[test]
fn test_calculate_width() {
let badge = Badge::new(options()).unwrap();
assert_eq!(badge.calculate_width("build"), 31);
assert_eq!(badge.calculate_width("passing"), 48);
}
#[test]
#[ignore]
fn test_to_svg() {
use std::fs::File;
use std::io::Write;
let mut file = File::create("test.svg").unwrap();
let options = BadgeOptions {
subject: "build".to_owned(),
status: "passing".to_owned(),
..BadgeOptions::default()
};
let badge = Badge::new(options).unwrap();
file.write_all(badge.to_svg().as_bytes()).unwrap();
}
}