feat: add nameVerFromPkgSnapshot()

README.md

@@ -55,6 +55,8 @@ Writes the current shrinkwrap file only. Fails if there is no `node_modules` dir
 
 Prunes a shrinkwrap file. Prunning means removing packages that are not referenced.
 
+### `nameVerFromPkgSnapshot(relDepPath, pkgSnapshot): {name: string, version: string}`
+
 ## License
 
 [MIT](LICENSE)

src/index.ts

@@ -3,6 +3,7 @@ export * from './read'
 export * from './types'
 
 import existsWanted from './existsWanted'
+import nameVerFromPkgSnapshot from './nameVerFromPkgSnapshot'
 import prune from './prune'
 import write, {
   writeCurrentOnly,
@@ -11,6 +12,7 @@ import write, {
 
 export {
   existsWanted,
+  nameVerFromPkgSnapshot,
   prune,
   write,
   writeWantedOnly,

src/nameVerFromPkgSnapshot.ts

@@ -0,0 +1,21 @@
+import * as dp from 'dependency-path'
+import {PackageSnapshot} from './types'
+
+export default (
+  relDepPath: string,
+  pkgSnapshot: PackageSnapshot,
+) => {
+  if (!pkgSnapshot.name) {
+    const pkgInfo = dp.parse(relDepPath)
+    return {
+      // tslint:disable:no-string-literal
+      name: pkgInfo['name'],
+      version: pkgInfo['version'],
+      // tslint:enable:no-string-literal
+    }
+  }
+  return {
+    name: pkgSnapshot.name,
+    version: pkgSnapshot.version,
+  }
+}

test/index.ts

@@ -1,2 +1,3 @@
 import './prune'
 import './read'
+import './nameVerFromPkgSnapshot'

test/nameVerFromPkgSnapshot.ts

@@ -0,0 +1,19 @@
+import {nameVerFromPkgSnapshot} from 'pnpm-shrinkwrap'
+import test = require('tape')
+
+test('nameVerFromPkgSnapshot()', (t) => {
+  t.deepEqual(nameVerFromPkgSnapshot('/some-weird-path', {
+    name: 'foo',
+    version: '1.0.0',
+  }), {
+    name: 'foo',
+    version: '1.0.0',
+  })
+
+  t.deepEqual(nameVerFromPkgSnapshot('/foo/1.0.0', {}), {
+    name: 'foo',
+    version: '1.0.0',
+  })
+
+  t.end()
+})