diff --git a/.eslintrc.json b/.eslintrc.json
index f7215c0a5..3096ee257 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -11,7 +11,16 @@
     "flowtype"
   ],
   "presets": ["es2015"],
+  
   "rules": {
+    "valid-jsdoc": 1,
+    "require-jsdoc": ["error", {
+        "require": {
+            "FunctionDeclaration": true,
+            "MethodDefinition": false,
+            "ClassDeclaration": false
+        }
+    }],
     "space-before-function-paren": ["error", "never"],
     "quotes": [1, "double", "avoid-escape"],
     "flowtype/define-flow-type": 1,
diff --git a/dangerfile.js b/dangerfile.js
index f593630c2..72e32a251 100644
--- a/dangerfile.js
+++ b/dangerfile.js
@@ -1,9 +1,14 @@
 // @flow
 
+// import danger from "danger"
 import danger from "./source/danger"
 
 // warn on changes in Package.json and not in shrinkwrap
 
 // warn on changelog
+// console.log(danger)
+// console.log(danger.git)
+// console.log(danger.git.created_files)
+
+console.log("Eval'd:", danger.git)
 
-danger.git.created_files.join(" ")
diff --git a/package.json b/package.json
index d2ed49b92..624526190 100644
--- a/package.json
+++ b/package.json
@@ -45,6 +45,8 @@
     "babel-plugin-transform-flow-strip-types": "^6.8.0",
     "babel-polyfill": "^6.16.0",
     "babel-preset-es2015": "^6.16.0",
+    "babel-plugin-syntax-async-functions": "^6.13.0",
+    "babel-plugin-transform-regenerator": "^6.16.1",
     "babel-preset-stage-3": "^6.17.0",
     "eslint": "^3.3.1",
     "eslint-config-standard": "^6.0.0-beta.3",
@@ -55,8 +57,6 @@
     "jest-cli": "^16.0.0"
   },
   "dependencies": {
-    "babel-plugin-syntax-async-functions": "^6.13.0",
-    "babel-plugin-transform-regenerator": "^6.16.1",
     "commander": "^2.9.0",
     "node-fetch": "^1.6.3",
     "parse-diff": "^0.4.0"
diff --git a/source/ci_source/ci_source.js b/source/ci_source/ci_source.js
index 7ef73d44b..d1afffbc8 100644
--- a/source/ci_source/ci_source.js
+++ b/source/ci_source/ci_source.js
@@ -1,4 +1,5 @@
 // @flow
+"strict mode"
 
 /** A json object that represents the outer ENV */
 export type Env = any;
@@ -6,6 +7,9 @@ export type Env = any;
 /** The shape of an object that represents an individual CI */
 
 export interface CISource {
+    /** The name, mainly for showing errors */
+    env: string,
+
     /** The hash of environment variables */
     env: Env,
 
@@ -27,3 +31,23 @@ export interface CISource {
     /** What is the URL for the repo */
     repoURL: string,
 }
+
+import Travis from "./travis"
+import Fake from "./fake"
+
+/**
+ * Gets a CI Source form the current environment, by asking all known
+ * sources if they can be represented in this environment.
+ * @param {Env} env The environment.
+ * @returns {?CISource} a CI source if it's OK, otherwise Danger can't run.
+*/
+export function getCISourceForEnv(env: Env) : ?CISource {
+  // Fake is what I'm using during dev for the minute
+  let travis = new Travis(env)
+  if (travis.isCI) {
+    return travis
+  } else {
+    return new Fake()
+  }
+}
+
diff --git a/source/ci_source/ci_source_helpers.js b/source/ci_source/ci_source_helpers.js
index 9fceb3f3e..f070066eb 100644
--- a/source/ci_source/ci_source_helpers.js
+++ b/source/ci_source/ci_source_helpers.js
@@ -3,7 +3,12 @@
 
 import type { Env } from "./ci_source"
 
-/** Validates that all ENV keys exist and have a length */
+/**
+ * Validates that all ENV keys exist and have a length
+ * @param {Env} env The environment.
+ * @param {[string]} keys Keys to ensure existence of
+ * @returns {bool} true if they exist, false if not
+*/
 export function ensureEnvKeysExist(env: Env, keys: string[]) : boolean {
   let hasKeys = keys.map((key: string) : boolean => {
     return env.hasOwnProperty(key) && env[key].length > 0
@@ -11,7 +16,12 @@ export function ensureEnvKeysExist(env: Env, keys: string[]) : boolean {
   return !hasKeys.includes(false)
 }
 
-/** Validates that all ENV keys exist and can be turned into ints */
+/**
+ * Validates that all ENV keys exist and can be turned into ints
+ * @param {Env} env The environment.
+ * @param {[string]} keys Keys to ensure existence and number-ness of
+ * @returns {bool} true if they are all good, false if not
+*/
 export function ensureEnvKeysAreInt(env: Env, keys: string[]) : boolean {
   let hasKeys = keys.map((key: string) : boolean => {
     return env.hasOwnProperty(key) && !isNaN(parseInt(env.TRAVIS_PULL_REQUEST))
diff --git a/source/ci_source/ci_source_selector.js b/source/ci_source/ci_source_selector.js
index 6ed517139..e69de29bb 100644
--- a/source/ci_source/ci_source_selector.js
+++ b/source/ci_source/ci_source_selector.js
@@ -1,11 +0,0 @@
-// @flow
-"strict mode"
-
-import type { Env, CISource } from "./ci_source"
-import Travis from "./travis"
-
-/** Here is some docs for the function */
-export function getCISourceForEnv(env: Env) : ?CISource {
-  let travis = new Travis(env)
-  return travis
-}
diff --git a/source/ci_source/fake.js b/source/ci_source/fake.js
index bf7821175..1b5e41600 100644
--- a/source/ci_source/fake.js
+++ b/source/ci_source/fake.js
@@ -6,6 +6,7 @@ import type { Env } from "./ci_source"
 export default class FakeCI {
   env: Env
   constructor(env: Env) { this.env = env }
+  get name(): string { return "Fake Testing CI" }
 
   get isCI() : boolean { return true }
   get isPR() : boolean { return true }
diff --git a/source/ci_source/travis.js b/source/ci_source/travis.js
index 55616b47e..e67ab94e1 100644
--- a/source/ci_source/travis.js
+++ b/source/ci_source/travis.js
@@ -7,6 +7,8 @@ export default class Travis {
   env: Env
   constructor(env: Env) { this.env = env }
 
+  get name(): string { return "Travis CI" }
+
   get isCI() : boolean {
     return ensureEnvKeysExist(this.env, ["HAS_JOSH_K_SEAL_OF_APPROVAL"])
   }
diff --git a/source/commands/danger-run.js b/source/commands/danger-run.js
index ec3352c71..57d2cf954 100755
--- a/source/commands/danger-run.js
+++ b/source/commands/danger-run.js
@@ -3,12 +3,9 @@ import "babel-polyfill"
 
 var program = require("commander")
 
-import { getCISourceForEnv } from "../ci_source/ci_source_selector"
-import { GitHub } from "../platforms/github"
-
-// import type { Platform } from "../platforms/platform"
-// import type { CISource } from "../ci_source/ci_source"
-import FakeCI from "../ci_source/fake"
+import { getCISourceForEnv } from "../ci_source/ci_source"
+import { getPlatformForEnv } from "../platforms/platform"
+import Executor from "../runner/Executor"
 
 program
   .option("-h, --head [commitish]", "TODO: Set the head commitish")
@@ -16,21 +13,22 @@ program
   .option("-f, --fail-on-errors", "TODO: Fail on errors")
   .parse(process.argv)
 
-// function setupPlatformWithSource(platform:Platform, source: CISource): void {
-
-// }
-
 let source = getCISourceForEnv(process.env)
-let fake = new FakeCI(process.env)
-let github = new GitHub("OK", fake)
-github.getInfo()
+if (!source) {
+  console.log("Could not find a CI source for this run")
+  process.exitCode = 1
+}
 
 if (source) {
-  console.log("OK?")
-  console.log(source.isCI)
-  console.log("Is PR?")
-  console.log(source.isPR)
-} else {
-  console.log("Could not find a CI source for this run")
-  process.exit(0)
+  const platform = getPlatformForEnv(process.env, source)
+  if (!platform) {
+    console.log(`Could not find a source code hosting platform for ${source.name}`)
+    process.exitCode = 1
+  }
+
+  if (platform) {
+    console.log(`OK, looks good ${source.name} on ${platform.name}`)
+    const exec = new Executor(source, platform)
+    exec.run()
+  }
 }
diff --git a/source/commands/danger.js b/source/commands/danger.js
index 924b00e2c..e0d15af41 100644
--- a/source/commands/danger.js
+++ b/source/commands/danger.js
@@ -1,4 +1,7 @@
 #! /usr/bin/env node
+
+console.log("OK")
+
 // @flow
 // This is needed so that other files can use async funcs
 import "babel-polyfill"
@@ -14,7 +17,4 @@ program
   .command("run", "Runs danger on your local system", {isDefault: true})
   .command("init", "Creates a new Dangerfile.js")
   .command("local", "Runs your changes against ")
-
-console.log("pre?")
-program.parse(process.argv)
-console.log("post?")
+  .parse(process.argv)
diff --git a/source/danger.js b/source/danger.js
index 2afa2463f..7b9a64da6 100644
--- a/source/danger.js
+++ b/source/danger.js
@@ -2,14 +2,14 @@
 // This file represents the module that is exposed as the danger API
 import "babel-polyfill"
 
-type DangerGit = {
+type GitDSL = {
   modified_files: string[],
   created_files: string[],
   deleted_files: string[]
 }
 
 type DangerDSL = {
-  git: DangerGit
+  git: GitDSL
 }
 
 const danger: DangerDSL = {
diff --git a/source/dsl/DangerDSL.js b/source/dsl/DangerDSL.js
new file mode 100644
index 000000000..55390880e
--- /dev/null
+++ b/source/dsl/DangerDSL.js
@@ -0,0 +1,15 @@
+// @flow
+"use strict"
+
+// import type { Platform } from "../platforms/platform"
+import type { GitDSL } from "../dsl/Git"
+
+export default class DangerDSL {
+  git: GitDSL
+  pr: any
+
+  constructor(pr: any, git: GitDSL) {
+    this.git = git
+    this.pr = pr
+  }
+}
diff --git a/source/dsl/git.js b/source/dsl/git.js
new file mode 100644
index 000000000..19594fccf
--- /dev/null
+++ b/source/dsl/git.js
@@ -0,0 +1,6 @@
+export interface GitDSL {
+  modified_files: string[],
+  created_files: string[],
+  deleted_files: string[]
+}
+
diff --git a/source/platforms/github.js b/source/platforms/github.js
index 36dbea98c..e110bb857 100644
--- a/source/platforms/github.js
+++ b/source/platforms/github.js
@@ -1,6 +1,7 @@
 // @flow
 "use strict"
 
+import type { GitDSL } from "../danger"
 import type { CISource } from "../ci_source/ci_source"
 import parseDiff from "parse-diff"
 
@@ -12,6 +13,8 @@ export type APIToken = string;
 export type GraphQLQuery = string;
 export type GraphQLResponse = any;
 
+/** This represent the GitHub API, and conforming to the Platform Interface */
+
 export class GitHub {
   token: APIToken
   ciSource: CISource
@@ -21,24 +24,33 @@ export class GitHub {
     this.ciSource = ciSource
   }
 
-  async getInfo() : void {
+  name: "GitHub"
+
+  async getReviewInfo() : Promise<any> {
     let deets = await this.getPullRequestInfo()
-    let pr = await deets.json()
-    console.log(pr)
+    return await deets.json()
+  }
 
+  async getReviewDiff() : Promise<GitDSL> {
     let diffReq = await this.getPullRequestDiff()
     let diff = await diffReq.text()
+
+    // Worth trying to add a flow-typed for this as a tester?
     let fileDiffs: [any] = parseDiff(diff)
 
     let addedDiffs = fileDiffs.filter((diff: any) => diff["new"])
     let removedDiffs = fileDiffs.filter((diff: any) => diff["deleted"])
-    let modified = fileDiffs.filter((diff: any) => !addedDiffs.includes(diff) && !removedDiffs.includes(diff))
+    let modifiedDiffs = fileDiffs.filter((diff: any) => !addedDiffs.includes(diff) && !removedDiffs.includes(diff))
 
-    console.log("Added: ", addedDiffs)
-    console.log("Removed: ", removedDiffs)
-    console.log("Modified: ", modified)
+    return {
+      modified_files: modifiedDiffs.map((d: any) => d.to),
+      created_files: addedDiffs.map((d: any) => d.to),
+      deleted_files: removedDiffs.map((d: any) => d.from)
+    }
   }
 
+  // The above is the API for Platform
+
   getUserInfo(): Promise<Response> {
     return this.get("user")
   }
diff --git a/source/platforms/platform.js b/source/platforms/platform.js
index 41206d88f..7d9aedf32 100644
--- a/source/platforms/platform.js
+++ b/source/platforms/platform.js
@@ -12,8 +12,15 @@ export type Comment = {
 }
 
 export interface Platform {
-    ciSource: CISource
+    /** Mainly for logging and error reporting */
+    name: String,
+    ciSource: CISource,
+    /** Pulls in the Code Review Metadata for inspection */
+    getReviewInfo: () => Promise<any>,
+    /** Pulls in the Code Review Diff, and offers a succinct user-API for it */
+    fetchDiffInfo: () => Promise<GitDSL>
 }
+
 //     envVars: () => string[];
 //     optionalEnvVars: () => string[];
 
@@ -32,3 +39,17 @@ export interface Platform {
 //     /** Edit an existing comment */
 //     async editComment: (comment: Comment, newBody: string) => Promise<boolean>;
 // }
+
+import { GitHub } from "./github"
+
+/**
+ * Pulls out a platform for Danger to communicate on based on the environment
+ * @param {Env} env The environment.
+ * @param {CISource} source The existing source, to ensure they can run against each other
+ * @returns {?Platform} returns a platform if it can be supported
+*/
+export function getPlatformForEnv(env: Env, source: CISource) : ?Platform {
+  let github = new GitHub(env["DANGER_GITHUB_API_TOKEN"], source)
+  return github
+}
+
diff --git a/source/runner/Dangerfile.js b/source/runner/Dangerfile.js
new file mode 100644
index 000000000..3eda24a89
--- /dev/null
+++ b/source/runner/Dangerfile.js
@@ -0,0 +1,40 @@
+// https://nodejs.org/api/vm.html
+// https://60devs.com/executing-js-code-with-nodes-vm-module.html
+
+import fs from "fs"
+import vm from "vm"
+import DangerDSL from "../dsl/DangerDSL"
+
+export default class Dangerfile {
+  dsl: DangerDSL
+  constructor(dsl: DangerDSL) { this.dsl = dsl }
+
+  run(file: string) {
+    fs.readFile(file, "utf8", (err: Error, data: string) => {
+      if (err) { return console.error(err.message) }
+
+      // comment out imports of 'danger'
+      // e.g `import danger from`
+      // then user get typed data, and we fill it in
+      // via the VM context
+
+      const cleaned = data.replace(/import danger from/gi, "// import danger from")
+
+      const script = new vm.Script(cleaned, {
+        filename: file,
+        lineOffset: 1,
+        columnOffset: 1,
+        displayErrors: true,
+        timeout: 1000 // ms
+      })
+
+      const context: any = {
+        console,
+        danger: this.dsl
+      }
+
+      script.runInNewContext(context)
+    })
+  }
+}
+
diff --git a/source/runner/Executor.js b/source/runner/Executor.js
new file mode 100644
index 000000000..174fb856c
--- /dev/null
+++ b/source/runner/Executor.js
@@ -0,0 +1,23 @@
+import Dangerfile from "../runner/Dangerfile"
+import DangerDSL from "../dsl/DangerDSL"
+import { Platform } from "../platforms/platform"
+
+// This is still badly named, maybe it really sbhould just be runner?
+
+export default class Executor {
+  ciSource: CISource
+  platform: Platform
+
+  constructor(ciSource: CISource, platform: Platform) {
+    this.ciSource = ciSource
+    this.platform = platform
+  }
+
+  async run() {
+    const git = await this.platform.getReviewDiff()
+    const pr = await this.platform.getReviewInfo()
+    let dsl = new DangerDSL(pr, git)
+    const dangerfile = new Dangerfile(dsl)
+    dangerfile.run("dangerfile.js")
+  }
+}