feat: show linked dependencies in installation summary

ref https://github.com/pnpm/pnpm/issues/732

src/index.ts

@@ -27,6 +27,7 @@ const BIG_TARBALL_SIZE = 1024 * 1024 * 5 // 5 MB
 
 const addedSign = chalk.green('+')
 const removedSign = chalk.red('-')
+const linkSign = chalk.magentaBright('#')
 const hlValue = chalk.blue
 const hlPkgId = chalk['whiteBright']
 
@@ -294,7 +295,11 @@ function printDiffs(pkgsDiff: PackageDiff[]) {
   // + chalk 2.0.0
   pkgsDiff.sort((a, b) => (a.name.localeCompare(b.name) * 10 + (Number(!b.added) - Number(!a.added))))
   const msg = pkgsDiff.map((pkg) => {
-    let result = pkg.added ? addedSign : removedSign
+    let result = pkg.added
+      ? addedSign
+      : pkg.linked
+        ? linkSign
+        : removedSign
     result += ` ${pkg.name}`
     if (pkg.version) {
       result += ` ${chalk.grey(pkg.version)}`
@@ -302,6 +307,9 @@ function printDiffs(pkgsDiff: PackageDiff[]) {
     if (pkg.deprecated) {
       result += ` ${chalk.red('deprecated')}`
     }
+    if (pkg.linked) {
+      result += ` ${chalk.magentaBright('linked from')} ${chalk.grey(pkg.from || '???')}`
+    }
     return result
   }).join(EOL)
   return msg

src/pkgsDiff.ts

@@ -6,10 +6,12 @@ import {
 import xs, {Stream} from 'xstream'
 
 export interface PackageDiff {
+  added: boolean,
+  from?: string,
   name: string,
   version?: string,
-  added: boolean,
   deprecated?: boolean,
+  linked?: true,
 }
 
 interface Map<T> {
@@ -55,6 +57,15 @@ export default (log$: xs<Log>, deprecationLog$: xs<DeprecationLog>) => {
       }
       return pkgsDiff
     }
+    if (rootLog['linked']) {
+      pkgsDiff[rootLog['linked'].dependencyType][`>${rootLog['linked'].name}`] = {
+        added: false,
+        from: rootLog['linked'].from,
+        linked: true,
+        name: rootLog['linked'].name,
+      }
+      return pkgsDiff
+    }
     return pkgsDiff
   }, {
     dev: {},