first commit

Author: poga

.gitignore

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+node_modules

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2016 Po Chieh
+
+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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+# hyperdrive-ln
+
+create symbolic link between [hyperdrives](https://github.com/mafintosh/hyperdrive)
+
+## Usage
+
+```js
+const tape = require('tape')
+const memdb = require('memdb')
+const hyperdrive = require('hyperdrive')
+const ln = require('.')
+
+var drive = hyperdrive(memdb())
+var archive = drive.createArchive()
+
+ln.link(archive, 'linkfile', <ARCHIVE KEY>, cb) // create symlink to another archive
+ln.readlink(archive, 'linkfile', cb) // get linked archive key
+ln.read(drive, archive, 'linkfile', cb) // returns a hyperdrive archive pointed to linked archive
+```

index.js

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+const collect = require('stream-collect')
+const Readable = require('stream').Readable
+
+module.exports = {read, readlink, link}
+
+function readlink (archive, entry, cb) {
+  collect(archive.createFileReadStream(entry), body => {
+    try {
+      var l = decode(body)
+      if (!l) return cb(new Error('no link found'))
+      cb(null, l)
+    } catch (e) {
+      cb(e)
+    }
+  })
+}
+
+function read (drive, archive, entry, cb) {
+  readlink(archive, entry, (err, info) => {
+    if (err) return cb(err)
+    cb(null, drive.createArchive(info))
+  })
+}
+
+function link (archive, entry, destArchiveKey, cb) {
+  var s = new Readable()
+  s.push(encode(destArchiveKey))
+  s.push(null)
+  var w = archive.createFileWriteStream(entry)
+  s.pipe(w).on('finish', cb)
+}
+
+function encode (destKey) {
+  return JSON.stringify({l: destKey})
+}
+
+function decode (b) {
+  return JSON.parse(b).l
+}

package.json

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+{
+  "name": "hyperdrive-ln",
+  "author": "Poga Po<poga.bahamut@gmail.com>",
+  "version": "1.0.0",
+  "main": "index.js",
+  "license": "MIT",
+  "dependencies": {
+    "stream-collect": "^1.3.1"
+  },
+  "repository": "poga/hyperdrive-ln",
+  "devDependencies": {
+    "hyperdrive": "^7.12.1",
+    "memdb": "^1.3.1",
+    "tape": "^4.6.3"
+  },
+  "scripts": {
+    "test": "node test.js"
+  }
+}

test.js

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+const tape = require('tape')
+const memdb = require('memdb')
+const hyperdrive = require('hyperdrive')
+
+const ln = require('.')
+
+tape('link', function (t) {
+  var drive = hyperdrive(memdb())
+  var archive = drive.createArchive()
+
+  ln.link(archive, 'symlink', 'foo', () => {
+    archive.list((err, entries) => {
+      t.error(err)
+      t.same(entries[0].name, 'symlink')
+
+      ln.readlink(archive, entries[0], (err, info) => {
+        t.error(err)
+        t.same(info, 'foo')
+        t.end()
+      })
+    })
+  })
+})