initial commit

.babelrc

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+{
+  "presets": [ "es2015" ],
+  "env": {
+    "test": {
+      "plugins": [ "istanbul" ]
+    }
+  }
+}

.editorconfig

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+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+
+indent_style = space
+indent_size = 2

.eslintrc

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+---
+parser: babel-eslint
+
+extends:
+  - defaults
+  - defaults/configurations/eslint
+
+env:
+  node: true
+  mocha: true
+  es6: true
+
+rules:
+  semi:
+    - error
+    - always
+
+  object-curly-spacing:
+    - error
+    - always
+
+  space-before-function-paren:
+    - error
+    - always
+
+  complexity:
+    - error
+    - 2
+
+  eol-last:
+    - error
+
+  quotes:
+    - error
+    - double
+    - avoidEscape: true
+      allowTemplateLiterals: true
+
+  no-unused-vars:
+    - error
+    - argsIgnorePattern: "^_"
+

.gitignore

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+node_modules/
+dist/
+coverage/
+.nyc_output/
+npm-debug.log

.npmignore

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+lib/
+test/
+node_modules/
+.*

.nvmrc

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+6.0.0

.travis.yml

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+language: node_js

README.md

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+# Predicado ✅ 
+
+[![build status](https://travis-ci.org/vvgomes/predicado.svg?branch=master)](https://travis-ci.org/vvgomes/predicado)
+[![npm version](https://img.shields.io/npm/v/predicado.svg)](https://www.npmjs.com/package/predicado)
+
+Predicado is a small library for convenient predicate driven validations. It is build on top of the [data.validation](https://github.com/folktale/data.validation) module from [Folktale](http://folktalejs.org/).
+
+## Getting Started
+
+```
+$ npm install predicado --save
+```
+
+```javascript
+import { validate } from "predicado";
+
+```
+
+## License
+
+Feel free to use this code as you please.

lib/validate.js

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+import Validation from "data.validation";
+import { curryN, reduce, length, always } from "ramda";
+
+const Success = Validation.Success;
+const Failure = Validation.Failure;
+
+const validate = (thing, validations) => {
+  const initial =
+    Success(curryN(length(validations), always(thing)))
+
+  const run = (acc, v) =>
+    acc.ap(v.predicate(thing) ? Success(thing) : Failure([v.error]));
+
+  return reduce(run, initial, validations);
+};
+
+export default validate;

package.json

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+{
+  "name": "predicado",
+  "version": "0.0.1",
+  "description": "Predicate Driven Validations",
+  "main": "dist/predicado.js",
+  "author": "vvgomes",
+  "license": "ISC",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/vvgomes/predicado.git"
+  },
+  "dependencies": {
+    "ramda": "^0.19.1",
+    "data.validation": "^1.2.0"
+  },
+  "devDependencies": {
+    "babel-cli": "^6.6.5",
+    "babel-eslint": "^6.1.2",
+    "babel-plugin-istanbul": "^2.0.1",
+    "babel-preset-es2015": "^6.6.0",
+    "eslint": "^3.5.0",
+    "eslint-config-defaults": "^9.0.0",
+    "mocha": "^2.4.5",
+    "nyc": "^8.1.0",
+    "sinon": "^1.17.5"
+  },
+  "scripts": {
+    "lint": "eslint {lib,test}/**/*",
+    "test": "nyc mocha --compilers js:babel-register --recursive",
+    "quality": "npm test && npm run lint",
+    "dist": "babel lib/ --out-dir dist/",
+    "prepublish": "npm test && npm run lint && npm run dist"
+  }
+}

test/validate.test.js

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+import assert from "assert";
+import Validation from "data.validation";
+import validate from "../lib/validate";
+import { has, where, test } from "ramda";
+
+const Success = Validation.Success;
+const Failure = Validation.Failure;
+
+describe("validate()", () => {
+
+  const validations = [
+    { error: "Name must be provided.", predicate: has("name") },
+    { error: "Password must be provided.", predicate: has("password") },
+    { error: "Email must be in a valid format.", predicate: where({ email: test(/@/) })}
+  ];
+
+  it("results in success when all predicates are true", () => {
+    const command = {
+      type: "addUser",
+      name: "John Doe",
+      email: "[email protected]",
+      password: "cupcake"
+    };
+
+    assert.deepEqual(
+      validate(command, validations),
+      Success(command)
+    );
+  });
+
+  it("results in failure when some predicates are false", () => {
+    const command = {
+      type: "addUser",
+      name: "John Doe",
+      email: "jdgmail.com"
+    };
+
+    assert.deepEqual(
+      validate(command, validations),
+      Failure([
+        "Password must be provided.",
+        "Email must be in a valid format."
+      ])
+    );
+  });
+});