postcss-px-to-viewprot-fix

postcss-px-to-viewprot-fix

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A plugin for PostCSS that generates viewport units (vw, vh, vmin, vmax) from pixel units.

Demo

If your project involves a fixed width, this script will help to convert pixels into viewport units.

Input

.class {
  margin: -10px .5vh;
  padding: 5vmin 9.5px 1px;
  border: 3px solid black;
  border-bottom-width: 1px;
  font-size: 14px;
  line-height: 20px;
}

.class2 {
  border: 1px solid black;
  margin-bottom: 1px;
  font-size: 20px;
  line-height: 30px;
}

@media (min-width: 750px) {
  .class3 {
    font-size: 16px;
    line-height: 22px;
  }
}

Output

.class {
  margin: -3.125vw .5vh;
  padding: 5vmin 2.96875vw 1px;
  border: 0.9375vw solid black;
  border-bottom-width: 1px;
  font-size: 4.375vw;
  line-height: 6.25vw;
}

.class2 {
  border: 1px solid black;
  margin-bottom: 1px;
  font-size: 6.25vw;
  line-height: 9.375vw;
}

@media (min-width: 750px) {
  .class3 {
    font-size: 16px;
    line-height: 22px;
  }
}

Getting Started

Installation

Add via npm

$ npm install postcss-px-to-viewport-fix --save-dev

or yarn

$ yarn add -D postcss-px-to-viewport-fix -D

Usage

Default Options:

{
  unitToConvert: 'px',
  viewportWidth: 320,
  unitPrecision: 5,
  propList: ['*'],
  viewportUnit: 'vw',
  fontViewportUnit: 'vw',
  selectorBlackList: [],
  minPixelValue: 1,
  mediaQuery: false,
  replace: true,
  exclude: [],
  landscape: false,
  landscapeUnit: 'vw',
  landscapeWidth: 568
}

• unitToConvert (String) unit to convert, by default, it is px.
• viewportWidth (Number) The width of the viewport.
• unitPrecision (Number) The decimal numbers to allow the vw units to grow to.
• propList (Array) The properties that can change from px to vw.
  • Values need to be exact matches.
  • Use wildcard * to enable all properties. Example: ['*']
  • Use * at the start or end of a word. (['position'] will match background-position-y)
  • Use ! to not match a property. Example: ['*', '!letter-spacing']
  • Combine the "not" prefix with the other prefixes. Example: ['', '!font']
• viewportUnit (String) Expected units.
• fontViewportUnit (String) Expected units for font.
• selectorBlackList (Array) The selectors to ignore and leave as px.
  • If value is string, it checks to see if selector contains the string.
    • ['body'] will match .body-class
  • If value is regexp, it checks to see if the selector matches the regexp.
    • [/^body$/] will match body but not .body
• minPixelValue (Number) Set the minimum pixel value to replace.
• mediaQuery (Boolean) Allow px to be converted in media queries.
• replace (Boolean) replaces rules containing vw instead of adding fallbacks.
• exclude (Array or Regexp) Ignore some files like 'node_modules'
  • If value is regexp, will ignore the matches files.
  • If value is array, the elements of the array are regexp.
• landscape (Boolean) Adds @media (orientation: landscape) with values converted via landscapeWidth.
• landscapeUnit (String) Expected unit for landscape option
• landscapeWidth (Number) Viewport width for landscape orientation.

Use with gulp-postcss

add to your gulpfile.js:

var gulp = require('gulp');
var postcss = require('gulp-postcss');
var pxtoviewport = require('postcss-px-to-viewport-fix');

gulp.task('css', function () {

    var processors = [
        pxtoviewport({
            viewportWidth: 320,
            viewportUnit: 'vmin'
        })
    ];

    return gulp.src(['build/css/**/*.css'])
        .pipe(postcss(processors))
        .pipe(gulp.dest('build/css'));
});

Use with PostCss configuration file

add to your postcss.config.js

module.exports = {
  plugins: {
    ...
    'postcss-px-to-viewport-fix': {
      // options
    }
  }
}

Running the tests

In order to run tests, you need to install jasmine-node globally:

$ npm install jasmine-node -g

Then run the tests via npm script:

$ npm run test