`executeCommand` function does not return expected value

[jpmartha]

A Work In Progress 👷🏻

Return value is not correct when executing $ xcodebuild -showBuildSettings.

[jpmartha]

In the current implementation, tryswiftdev is different from Terminal.app in operating environment.

Apple Swift version 3.0-dev (LLVM 752e1430fc, Clang 1e6cba3ce3, Swift 56052cfe61)
Target: x86_64-apple-macosx10.9

< Executing `xcodebuild -showBuildSettings` with `posix_spawnp` function in tryswiftdev
---
> Typing `xcodebuild -showBuildSettings` in Terminal.app

39c39
<     COLOR_DIAGNOSTICS = NO
---
>     COLOR_DIAGNOSTICS = YES
86c86
<     ENABLE_BITCODE = NO
---
>     ENABLE_BITCODE = 0
151c151
<     LD_RUNPATH_SEARCH_PATHS = /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx
---
>     LD_RUNPATH_SEARCH_PATHS = /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2016-04-25-a.xctoolchain/usr/lib/swift/macosx
187c187
<     PATH = /Applications/Xcode.app/Contents/Developer/usr/bin
---
>     PATH = /Applications/Xcode.app/Contents/Developer/usr/bin:/Library/Developer/Toolchains/swift-latest.xctoolchain/usr/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
253a254
>     SWIFT_DISABLE_REQUIRED_ARCLITE = 1
255a257
>     SWIFT_LINK_OBJC_RUNTIME = 1
289c291,292
<     TOOLCHAIN_DIR = /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
---
>     TOOLCHAINS = org.swift.3020160425a
>     TOOLCHAIN_DIR = /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2016-04-25-a.xctoolchain
306a310
>     XCODE_DEFAULT_TOOLCHAIN_OVERRIDE = /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2016-04-25-a.xctoolchain
313a318
>     diagnostic_message_length = 80

[jpmartha]

Executing xcodebuild -showBuildSettings with <buildsetting>=<value>, ...

xcodebuild -showBuildSettings <buildsetting>=<value>, ...

Concretly;

"ENABLE_BITCODE=0",
"SWIFT_DISABLE_REQUIRED_ARCLITE=1",
"SWIFT_LINK_OBJC_RUNTIME=1",
"TOOLCHAINS=org.swift.3020160425a",
"XCODE_DEFAULT_TOOLCHAIN_OVERRIDE=/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2016-04-25-a.xctoolchain",

For now, I have hard-coding Toolchains' version.