first commit

.gitignore

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+# Logs
+logs
+*.log
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+.coveralls.yml
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directory
+# Commenting this out is preferred by some people, see
+# https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git-
+node_modules
+
+# Users Environment Variables
+.lock-wscript

.travis.yml

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+language: node_js
+node_js:
+  - 'iojs'
+  - '0.10'
+  - '0.12'
+before_install:
+  - npm i -g gulp
+after_success:
+  - gulp coveralls

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015 Javier Cejudo
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

README.md

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+# linear-preset-by-coefficients
+
+[![Build Status](https://travis-ci.org/javiercejudo/linear-preset-by-coefficients.svg)](https://travis-ci.org/javiercejudo/linear-preset-by-coefficients)
+[![Coverage Status](https://coveralls.io/repos/javiercejudo/linear-preset-by-coefficients/badge.svg?branch=master)](https://coveralls.io/r/javiercejudo/linear-preset-by-coefficients?branch=master)
+[![Code Climate](https://codeclimate.com/github/javiercejudo/linear-preset-by-coefficients/badges/gpa.svg)](https://codeclimate.com/github/javiercejudo/linear-preset-by-coefficients)
+
+Generate linear presets from coefficients
+
+## Install
+
+    npm i linear-preset-by-coefficients
+
+## Usage
+
+```js
+var Decimal = require('linear-arbitrary-precision')(require('floating-adapter'));
+var preset = require('linear-preset-by-coefficients')(Decimal);
+
+// all numbers are Decimal
+preset(temp, 9/5, 32);  // => [[0, 1], [32, 33.8]]
+```
+
+## Related projects
+
+- [linear-presets](https://github.com/javiercejudo/linear-presets): linear presets for common units.
+- [linear-converter](https://github.com/javiercejudo/linear-converter): flexible linear converter.

gulpfile.js

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+var gulp = require('gulp');
+var mocha = require('gulp-mocha');
+var istanbul = require('gulp-istanbul');
+var rimraf = require('rimraf');
+var coveralls = require('gulp-coveralls');
+
+gulp.task('clean', function (cb) {
+  rimraf('./coverage', cb);
+});
+
+gulp.task('instrument', function () {
+  return gulp.src(['src/*.js'])
+    .pipe(istanbul())
+    .pipe(istanbul.hookRequire());
+});
+
+gulp.task('test', ['clean', 'instrument'], function () {
+  return gulp.src(['test/*.js'])
+    .pipe(mocha())
+    .pipe(istanbul.writeReports());
+});
+
+gulp.task('coveralls', function () {
+  gulp.src('coverage/lcov.info')
+    .pipe(coveralls());
+});
+
+gulp.task('default', ['test']);

package.json

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+{
+  "name": "linear-preset-by-coefficients",
+  "version": "0.0.0",
+  "description": "Generate linear presets from coefficients",
+  "main": "src/index.js",
+  "scripts": {
+    "test": "gulp test"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/javiercejudo/linear-preset-by-coefficients"
+  },
+  "keywords": [
+    "conversion",
+    "units"
+  ],
+  "author": "Javier Cejudo",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/javiercejudo/linear-preset-by-coefficients/issues"
+  },
+  "homepage": "https://github.com/javiercejudo/linear-preset-by-coefficients",
+  "devDependencies": {
+    "floating-adapter": "^1.2.1",
+    "gulp": "^3.9.0",
+    "gulp-coveralls": "^0.1.4",
+    "gulp-istanbul": "^0.10.2",
+    "gulp-mocha": "^2.1.3",
+    "linear-arbitrary-precision": "^3.1.0",
+    "linear-presets-temperature": "^2.0.3",
+    "lodash.isfunction": "^3.0.6",
+    "rimraf": "^2.4.3",
+    "should": "^7.1.1"
+  },
+  "dependencies": {
+    "linear-converter": "^7.0.2",
+    "unit-preset": "^1.0.1",
+    "unit-scale": "^1.0.1"
+  }
+}

src/index.js

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+/*jshint node:true */
+
+'use strict';
+
+var lcFactory = require('linear-converter');
+var unitScale = require('unit-scale');
+var unitPreset = require('unit-preset');
+
+module.exports = function factory(Decimal) {
+  var lc = lcFactory(Decimal);
+
+  return function coefficients(a, b) {
+    var decimalA = new Decimal(a.toString());
+    var decimalB = new Decimal(b.toString());
+
+    return lc.composeConversions(
+      [
+        unitScale,
+        [
+          decimalB,
+          decimalA.plus(decimalB)
+        ]
+      ],
+      unitPreset
+    );
+  };
+};

test/spec.js

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+/*jshint node:true, mocha:true */
+
+'use strict';
+
+require('should');
+
+var adapter = require('floating-adapter');
+var Decimal = require('linear-arbitrary-precision')(adapter);
+var coefficients = require('../src/')(Decimal);
+var isFunction = require('lodash.isfunction');
+
+function scaleVals(scale) {
+  return scale.map(Number);
+}
+
+describe('coefficients', function() {
+  it('creates presets from coefficients', function() {
+    coefficients(9/5, 32).map(scaleVals).should.eql([[0, 1], [32, 33.8]]);
+    coefficients(-5, -2).map(scaleVals).should.eql([[0, 1], [-2, -7]]);
+    coefficients(757, -567).map(scaleVals).should.eql([[0, 1], [-567, 190]]);
+  });
+
+  it('creates presets with Decimals', function() {
+    coefficients(9/5, 32).every(function(scale) {
+      return [scale[0].plus, scale[1].plus].every(isFunction);
+    }).should.be.exactly(true);
+  });
+});