Abstracted away req/res from VFS calls in favor of options (#34)

Instead of:

```
const adapter = core => ({
  readdir: vfs => file => {
    console.log(vfs.req.session.user.username)
  }
})
```

Is now this:

```
const adapter = core => ({
  readdir: vfs => (file, options) => {
    console.log(options.session.user.username)
  }
})
```

__tests__/adapters/vfs/system.js

@@ -15,16 +15,6 @@ describe('VFS System adapter', () => {
   afterAll(() => core.destroy());
 
   const vfs = {
-    req: {
-      session: {
-        user: {
-          username: 'jest'
-        }
-      }
-    },
-    res: {
-
-    },
     mount: {
       name: 'home',
       root: 'home:/',
@@ -34,18 +24,27 @@ describe('VFS System adapter', () => {
     }
   };
 
+  const createOptions = (options = {}) => ({
+    ...options,
+    session: {
+      user: {
+        username: 'jest'
+      }
+    }
+  });
+
   const request = (name, ...args) => adapter[name](vfs, vfs)(...args);
 
   test('#touch', () => {
-    return expect(request('touch', 'home:/test'))
+    return expect(request('touch', 'home:/test', createOptions()))
       .resolves
       .toBe(true);
   });
 
   test('#stat', () => {
     const realPath = path.join(core.configuration.tempPath, 'jest/test');
 
-    return expect(request('stat', 'home:/test'))
+    return expect(request('stat', 'home:/test', createOptions()))
       .resolves
       .toMatchObject({
         filename: 'test',
@@ -58,37 +57,37 @@ describe('VFS System adapter', () => {
   });
 
   test('#copy', () => {
-    return expect(request('copy', 'home:/test', 'home:/test-copy'))
+    return expect(request('copy', 'home:/test', 'home:/test-copy', createOptions()))
       .resolves
       .toBe(true);
   });
 
   test('#rename', () => {
-    return expect(request('rename', 'home:/test-copy', 'home:/test-rename'))
+    return expect(request('rename', 'home:/test-copy', 'home:/test-rename', createOptions()))
       .resolves
       .toBe(true);
   });
 
   test('#mkdir', () => {
-    return expect(request('mkdir', 'home:/test-directory'))
+    return expect(request('mkdir', 'home:/test-directory', createOptions()))
       .resolves
       .toBe(true);
   });
 
   test('#mkdir - existing directory', () => {
-    return expect(request('mkdir', 'home:/test-directory'))
+    return expect(request('mkdir', 'home:/test-directory', createOptions()))
       .rejects
       .toThrowError();
   });
 
   test('#mkdir - ensure', () => {
-    return expect(request('mkdir', 'home:/test-directory', {ensure: true}))
+    return expect(request('mkdir', 'home:/test-directory', createOptions({ensure: true})))
       .resolves
       .toBe(true);
   });
 
   test('#readfile', () => {
-    return expect(request('readfile', 'home:/test'))
+    return expect(request('readfile', 'home:/test', createOptions()))
       .resolves
       .toBeInstanceOf(stream.Readable);
   });
@@ -99,31 +98,31 @@ describe('VFS System adapter', () => {
     s.push('jest');
     s.push(null);
 
-    return expect(request('writefile', 'home:/test', s))
+    return expect(request('writefile', 'home:/test', s, createOptions()))
       .resolves
       .toBe(true);
   });
 
   test('#exists - existing file', () => {
-    return expect(request('exists', 'home:/test-rename'))
+    return expect(request('exists', 'home:/test-rename', createOptions()))
       .resolves
       .toBe(true);
   });
 
   test('#exists - existing directory', () => {
-    return expect(request('exists', 'home:/test-directory'))
+    return expect(request('exists', 'home:/test-directory', createOptions()))
       .resolves
       .toBe(true);
   });
 
   test('#exists - non existing file', () => {
-    return expect(request('exists', 'home:/test-copy'))
+    return expect(request('exists', 'home:/test-copy', createOptions()))
       .resolves
       .toBe(false);
   });
 
   test('#search', () => {
-    return expect(request('search', 'home:/', '*'))
+    return expect(request('search', 'home:/', '*', createOptions()))
       .resolves
       .toEqual(
         expect.arrayContaining([
@@ -140,7 +139,7 @@ describe('VFS System adapter', () => {
   });
 
   test('#readdir', () => {
-    return expect(request('readdir', 'home:/'))
+    return expect(request('readdir', 'home:/', createOptions()))
       .resolves
       .toEqual(
         expect.arrayContaining([
@@ -164,22 +163,22 @@ describe('VFS System adapter', () => {
     const files = ['home:/test', 'home:/test-directory', 'home:/test-rename'];
 
     return Promise.all(files.map(f => {
-      return expect(request('unlink', f))
+      return expect(request('unlink', f, createOptions()))
         .resolves
         .toBe(true);
     }));
   });
 
   test('#unlink', () => {
-    return expect(request('unlink', 'home:/test-directory'))
+    return expect(request('unlink', 'home:/test-directory', createOptions()))
       .resolves
       .toBe(true);
   });
 
   test('#realpath', () => {
     const realPath = path.join(core.configuration.tempPath, 'jest/test');
 
-    return expect(request('realpath', 'home:/test'))
+    return expect(request('realpath', 'home:/test', createOptions()))
       .resolves
       .toBe(realPath);
   });

__tests__/filesystem.js

@@ -46,8 +46,8 @@ describe('Filesystem', () => {
       .toBe('test/jest');
   });
 
-  test('#mount', () => {
-    mountpoint = filesystem.mount({
+  test('#mount', async () => {
+    mountpoint = await filesystem.mount({
       name: 'jest',
       attributes: {
         root: '/tmp'

src/adapters/vfs/system.js

@@ -80,14 +80,14 @@ const segments = {
 
   username: {
     dynamic: true,
-    fn: (core, req) => req.session.user.username
+    fn: (core, session) => session.user.username
   }
 };
 
 /*
  * Gets a segment value
  */
-const getSegment = (core, req, seg) => segments[seg] ? segments[seg].fn(core, req) : '';
+const getSegment = (core, session, seg) => segments[seg] ? segments[seg].fn(core, session) : '';
 
 /*
  * Matches a string for segments
@@ -97,16 +97,16 @@ const matchSegments = str => (str.match(/(\{\w+\})/g) || []);
 /*
  * Resolves a string with segments
  */
-const resolveSegments = (core, req, str) => matchSegments(str)
-  .reduce((result, current) => result.replace(current, getSegment(core, req, current.replace(/(\{|\})/g, ''))), str);
+const resolveSegments = (core, session, str) => matchSegments(str)
+  .reduce((result, current) => result.replace(current, getSegment(core, session, current.replace(/(\{|\})/g, ''))), str);
 
 /*
  * Resolves a given file path based on a request
  * Will take out segments from the resulting string
  * and replace them with a list of defined variables
  */
-const getRealPath = (core, req, mount, file) => {
-  const root = resolveSegments(core, req, mount.attributes.root);
+const getRealPath = (core, session, mount, file) => {
+  const root = resolveSegments(core, session, mount.attributes.root);
   const str = file.substr(mount.root.length - 1);
   return path.join(root, str);
 };
@@ -118,7 +118,7 @@ const getRealPath = (core, req, mount, file) => {
  */
 module.exports = (core) => {
   const wrapper = (method, cb, ...args) => vfs => (file, options = {}) => {
-    const promise = Promise.resolve(getRealPath(core, vfs.req, vfs.mount, file))
+    const promise = Promise.resolve(getRealPath(core, options.session, vfs.mount, file))
       .then(realPath => fs[method](realPath, ...args));
 
     return typeof cb === 'function'
@@ -127,19 +127,17 @@ module.exports = (core) => {
   };
 
   const crossWrapper = method => (srcVfs, destVfs) => (src, dest, options = {}) => Promise.resolve({
-    realSource: getRealPath(core, srcVfs.req, srcVfs.mount, src),
-    realDest: getRealPath(core, destVfs.req, destVfs.mount, dest)
+    realSource: getRealPath(core, options.session, srcVfs.mount, src),
+    realDest: getRealPath(core, options.session, destVfs.mount, dest)
   })
     .then(({realSource, realDest}) => fs[method](realSource, realDest))
     .then(() => true);
 
   return {
     watch: (mount, callback) => {
       const dest = resolveSegments(core, {
-        session: {
-          user: {
-            username: '**'
-          }
+        user: {
+          username: '**'
         }
       }, mount.attributes.root);
 
@@ -168,6 +166,7 @@ module.exports = (core) => {
     /**
      * Checks if file exists
      * @param {String} file The file path from client
+     * @param {Object} [options={}] Options
      * @return {Promise<boolean, Error>}
      */
     exists: wrapper('access', promise => {
@@ -178,10 +177,11 @@ module.exports = (core) => {
     /**
      * Get file statistics
      * @param {String} file The file path from client
+     * @param {Object} [options={}] Options
      * @return {Object}
      */
-    stat: vfs => file =>
-      Promise.resolve(getRealPath(core, vfs.req, vfs.mount, file))
+    stat: vfs => (file, options = {}) =>
+      Promise.resolve(getRealPath(core, options.session, vfs.mount, file))
         .then(realPath => {
           return fs.access(realPath, fs.F_OK)
             .then(() => createFileIter(core, path.dirname(realPath), realPath));
@@ -190,10 +190,11 @@ module.exports = (core) => {
     /**
      * Reads directory
      * @param {String} root The file path from client
+     * @param {Object} [options={}] Options
      * @return {Object[]}
      */
-    readdir: vfs => root =>
-      Promise.resolve(getRealPath(core, vfs.req, vfs.mount, root))
+    readdir: vfs => (root, options) =>
+      Promise.resolve(getRealPath(core, options.session, vfs.mount, root))
         .then(realPath => fs.readdir(realPath).then(files => ({realPath, files})))
         .then(({realPath, files}) => {
           const promises = files.map(f => createFileIter(core, realPath, root.replace(/\/?$/, '/') + f));
@@ -203,10 +204,11 @@ module.exports = (core) => {
     /**
      * Reads file stream
      * @param {String} file The file path from client
+     * @param {Object} [options={}] Options
      * @return {stream.Readable}
      */
     readfile: vfs => (file, options = {}) =>
-      Promise.resolve(getRealPath(core, vfs.req, vfs.mount, file))
+      Promise.resolve(getRealPath(core, options.session, vfs.mount, file))
         .then(realPath => fs.stat(realPath).then(stat => ({realPath, stat})))
         .then(({realPath, stat}) => {
           if (!stat.isFile()) {
@@ -224,9 +226,10 @@ module.exports = (core) => {
     /**
      * Creates directory
      * @param {String} file The file path from client
+     * @param {Object} [options={}] Options
      * @return {boolean}
      */
-    mkdir: wrapper('mkdir', (promise, options) => {
+    mkdir: wrapper('mkdir', (promise, options = {}) => {
       return promise
         .then(() => true)
         .catch(e => {
@@ -242,13 +245,14 @@ module.exports = (core) => {
      * Writes file stream
      * @param {String} file The file path from client
      * @param {stream.Readable} data The stream
+     * @param {Object} [options={}] Options
      * @return {Promise<boolean, Error>}
      */
-    writefile: vfs => (file, data) => new Promise((resolve, reject) => {
+    writefile: vfs => (file, data, options = {}) => new Promise((resolve, reject) => {
       // FIXME: Currently this actually copies the file because
       // formidable will put this in a temporary directory.
       // It would probably be better to do a "rename()" on local filesystems
-      const realPath = getRealPath(core, vfs.req, vfs.mount, file);
+      const realPath = getRealPath(core, options.session, vfs.mount, file);
 
       const write = () => {
         const stream = fs.createWriteStream(realPath);
@@ -270,6 +274,7 @@ module.exports = (core) => {
      * Renames given file or directory
      * @param {String} src The source file path from client
      * @param {String} dest The destination file path from client
+     * @param {Object} [options={}] Options
      * @return {boolean}
      */
     rename: crossWrapper('rename'),
@@ -278,24 +283,27 @@ module.exports = (core) => {
      * Copies given file or directory
      * @param {String} src The source file path from client
      * @param {String} dest The destination file path from client
+     * @param {Object} [options={}] Options
      * @return {boolean}
      */
     copy: crossWrapper('copy'),
 
     /**
      * Removes given file or directory
      * @param {String} file The file path from client
+     * @param {Object} [options={}] Options
      * @return {boolean}
      */
     unlink: wrapper('remove'),
 
     /**
      * Searches for files and folders
      * @param {String} file The file path from client
+     * @param {Object} [options={}] Options
      * @return {boolean}
      */
-    search: vfs => (root, pattern) =>
-      Promise.resolve(getRealPath(core, vfs.req, vfs.mount, root))
+    search: vfs => (root, pattern, options = {}) =>
+      Promise.resolve(getRealPath(core, options.session, vfs.mount, root))
         .then(realPath => {
           return fh.create()
             .paths(realPath)
@@ -323,16 +331,18 @@ module.exports = (core) => {
     /**
      * Touches a file
      * @param {String} file The file path from client
+     * @param {Object} [options={}] Options
      * @return {boolean}
      */
     touch: wrapper('ensureFile'),
 
     /**
      * Gets the real filesystem path (internal only)
      * @param {String} file The file path from client
+     * @param {Object} [options={}] Options
      * @return {string}
      */
-    realpath: vfs => file =>
-      Promise.resolve(getRealPath(core, vfs.req, vfs.mount, file))
+    realpath: vfs => (file, options = {}) =>
+      Promise.resolve(getRealPath(core, options.session, vfs.mount, file))
   };
 };