* first action! (#1)

node_modules/pacote/lib/fetchers/file.js

@@ -0,0 +1,78 @@
+'use strict'
+
+const BB = require('bluebird')
+
+const cacache = require('cacache')
+const Fetcher = require('../fetch')
+const fs = require('fs')
+const pipe = BB.promisify(require('mississippi').pipe)
+const through = require('mississippi').through
+
+const readFileAsync = BB.promisify(fs.readFile)
+const statAsync = BB.promisify(fs.stat)
+
+const MAX_BULK_SIZE = 2 * 1024 * 1024 // 2MB
+
+// `file` packages refer to local tarball files.
+const fetchFile = module.exports = Object.create(null)
+
+Fetcher.impl(fetchFile, {
+  packument (spec, opts) {
+    return BB.reject(new Error('Not implemented yet'))
+  },
+
+  manifest (spec, opts) {
+    // We can't do much here. `finalizeManifest` will take care of
+    // calling `tarball` to fill out all the necessary details.
+    return BB.resolve(null)
+  },
+
+  // All the heavy lifting for `file` packages is done here.
+  // They're never cached. We just read straight out of the file.
+  // TODO - maybe they *should* be cached?
+  tarball (spec, opts) {
+    const src = spec._resolved || spec.fetchSpec
+    const stream = through()
+    statAsync(src).then(stat => {
+      if (spec._resolved) { stream.emit('manifest', spec) }
+      if (stat.size <= MAX_BULK_SIZE) {
+        // YAY LET'S DO THING IN BULK
+        return readFileAsync(src).then(data => {
+          if (opts.cache) {
+            return cacache.put(
+              opts.cache, `pacote:tarball:file:${src}`, data, {
+                integrity: opts.integrity
+              }
+            ).then(integrity => ({ data, integrity }))
+          } else {
+            return { data }
+          }
+        }).then(info => {
+          if (info.integrity) { stream.emit('integrity', info.integrity) }
+          stream.write(info.data, () => {
+            stream.end()
+          })
+        })
+      } else {
+        let integrity
+        const cacheWriter = !opts.cache
+          ? BB.resolve(null)
+          : (pipe(
+            fs.createReadStream(src),
+            cacache.put.stream(opts.cache, `pacote:tarball:${src}`, {
+              integrity: opts.integrity
+            }).on('integrity', d => { integrity = d })
+          ))
+        return cacheWriter.then(() => {
+          if (integrity) { stream.emit('integrity', integrity) }
+          return pipe(fs.createReadStream(src), stream)
+        })
+      }
+    }).catch(err => stream.emit('error', err))
+    return stream
+  },
+
+  fromManifest (manifest, spec, opts) {
+    return this.tarball(manifest || spec, opts)
+  }
+})