From 98c1ce95d4f33e0c2a8cb9f6a32234e7c270280b Mon Sep 17 00:00:00 2001
From: Mike Grabowski <grabbou@gmail.com>
Date: Thu, 18 Apr 2019 16:59:49 +0200
Subject: [PATCH] Support functions in default

---
 packages/cli/src/cliEntry.js                               | 2 +-
 packages/cli/src/tools/config/schema.js                    | 4 +++-
 packages/platform-android/src/commands/runAndroid/index.js | 2 +-
 packages/platform-ios/src/commands/runIOS/index.js         | 2 +-
 types/index.js                                             | 6 +++++-
 5 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/packages/cli/src/cliEntry.js b/packages/cli/src/cliEntry.js
index 3d5a9ea0e..ad3eae7d5 100644
--- a/packages/cli/src/cliEntry.js
+++ b/packages/cli/src/cliEntry.js
@@ -125,7 +125,7 @@ const addCommand = (command: CommandT, ctx: ConfigT) => {
       opt.command,
       opt.description,
       opt.parse || defaultOptParser,
-      opt.default,
+      typeof opt.default === 'function' ? opt.default(ctx) : opt.default,
     ),
   );
 };
diff --git a/packages/cli/src/tools/config/schema.js b/packages/cli/src/tools/config/schema.js
index 094c4e335..c55015d17 100644
--- a/packages/cli/src/tools/config/schema.js
+++ b/packages/cli/src/tools/config/schema.js
@@ -22,7 +22,9 @@ const command = t.object({
       command: t.string().required(),
       description: t.string(),
       parse: t.func(),
-      default: t.alternatives().try([t.bool(), t.number(), t.string()]),
+      default: t
+        .alternatives()
+        .try([t.bool(), t.number(), t.string(), t.func()]),
     }),
   ),
   examples: t.array().items(
diff --git a/packages/platform-android/src/commands/runAndroid/index.js b/packages/platform-android/src/commands/runAndroid/index.js
index e3e37b5ad..f1553c51d 100644
--- a/packages/platform-android/src/commands/runAndroid/index.js
+++ b/packages/platform-android/src/commands/runAndroid/index.js
@@ -362,7 +362,7 @@ export default {
       command: '--terminal [string]',
       description:
         'Launches the Metro Bundler in a new window using the specified terminal path.',
-      default: getDefaultUserTerminal(),
+      default: getDefaultUserTerminal,
     },
   ],
 };
diff --git a/packages/platform-ios/src/commands/runIOS/index.js b/packages/platform-ios/src/commands/runIOS/index.js
index 777090cd3..5786c204c 100644
--- a/packages/platform-ios/src/commands/runIOS/index.js
+++ b/packages/platform-ios/src/commands/runIOS/index.js
@@ -452,7 +452,7 @@ export default {
       command: '--terminal [string]',
       description:
         'Launches the Metro Bundler in a new window using the specified terminal path.',
-      default: getDefaultUserTerminal(),
+      default: getDefaultUserTerminal,
     },
   ],
 };
diff --git a/types/index.js b/types/index.js
index d90cb35f6..feef6bcd2 100644
--- a/types/index.js
+++ b/types/index.js
@@ -10,7 +10,11 @@ export type CommandT = {
     command: string,
     description?: string,
     parse?: (val: string) => any,
-    default?: string | boolean | number,
+    default?:
+      | string
+      | boolean
+      | number
+      | ((ctx: ConfigT) => string | boolean | number),
   }>,
   examples?: Array<{
     desc: string,