Files
shields/lib/color-formatters.js
Paul Melnikow 8e08b374a4 [Github] Last commit date and commit activity (#1112)
Reopen of #928 by mskonovalov. Closes #897.
2017-10-02 10:47:14 -04:00

97 lines
2.4 KiB
JavaScript

/**
* Commonly-used functions for determining the colour to use for a badge,
* including colours based off download count, version number, etc.
*/
'use strict';
const moment = require('moment');
function version(version) {
let first = version[0];
if (first === 'v') {
first = version[1];
} else if (/^[0-9]/.test(version)) {
version = 'v' + version;
}
if (first === '0' || (version.indexOf('-') !== -1)) {
return { version: version, color: 'orange' };
} else {
return { version: version, color: 'blue' };
}
}
function downloadCount(downloads) {
return floorCount(downloads, 10, 100, 1000);
}
function coveragePercentage(percentage) {
return floorCount(percentage, 80, 90, 100);
}
function floorCount(value, yellow, yellowgreen, green) {
if (value <= 0) {
return 'red';
} else if (value < yellow) {
return 'yellow';
} else if (value < yellowgreen) {
return 'yellowgreen';
} else if (value < green) {
return 'green';
} else {
return 'brightgreen';
}
}
function colorScale(steps, colors, reversed) {
if (steps === undefined) {
throw Error('When invoking colorScale, steps should be provided.');
}
const defaultColors = {
1: ['red', 'brightgreen'],
2: ['red', 'yellow', 'brightgreen'],
3: ['red', 'yellow', 'green', 'brightgreen'],
4: ['red', 'yellow', 'yellowgreen', 'green', 'brightgreen'],
5: ['red', 'orange', 'yellow', 'yellowgreen', 'green', 'brightgreen'],
};
if (typeof colors === 'undefined') {
if (steps.length in defaultColors) {
colors = defaultColors[steps.length];
} else {
throw Error(`No default colors for ${steps.length} steps.`);
}
}
if (steps.length !== colors.length - 1) {
throw Error('When colors are provided, there should be n + 1 colors for n steps.');
}
if (reversed) {
colors = Array.from(colors).reverse();
}
return value => {
const stepIndex = steps.findIndex(step => value < step);
// For the final step, stepIndex is -1, so in all cases this expression
// works swimmingly.
return colors.slice(stepIndex)[0];
};
}
function age(date) {
const colorByAge = colorScale([7, 30, 180, 365, 730], undefined, true);
const daysElapsed = moment().diff(moment(date), 'days');
return colorByAge(daysElapsed);
}
module.exports = {
version,
downloadCount,
coveragePercentage,
floorCount,
colorScale,
age
};