From 9fb05d8c9fe17c43cd228114013d706083ac3b6d Mon Sep 17 00:00:00 2001
From: Jeff Gaston <jeffrygaston@google.com>
Date: Mon, 21 Aug 2017 18:27:00 -0700
Subject: [PATCH] Support 'tapas help' for more-detailed tapas help

Bug: 64844028
Test: tapas help
Change-Id: I5629ca781e8cacfa6bb09828acf4160bbca3c3a5
---
 envsetup.sh  |  6 ++++++
 tapasHelp.sh | 23 +++++++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100755 tapasHelp.sh

diff --git a/envsetup.sh b/envsetup.sh
index a8bef92161..ec100b160c 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -644,11 +644,17 @@ complete -F _lunch lunch
 # Run tapas with one or more app names (from LOCAL_PACKAGE_NAME)
 function tapas()
 {
+    local showHelp="$(echo $* | xargs -n 1 echo | \grep -E '^(help)$' | xargs)"
     local arch="$(echo $* | xargs -n 1 echo | \grep -E '^(arm|x86|mips|armv5|arm64|x86_64|mips64)$' | xargs)"
     local variant="$(echo $* | xargs -n 1 echo | \grep -E '^(user|userdebug|eng)$' | xargs)"
     local density="$(echo $* | xargs -n 1 echo | \grep -E '^(ldpi|mdpi|tvdpi|hdpi|xhdpi|xxhdpi|xxxhdpi|alldpi)$' | xargs)"
     local apps="$(echo $* | xargs -n 1 echo | \grep -E -v '^(user|userdebug|eng|arm|x86|mips|armv5|arm64|x86_64|mips64|ldpi|mdpi|tvdpi|hdpi|xhdpi|xxhdpi|xxxhdpi|alldpi)$' | xargs)"
 
+    if [ "$showHelp" != "" ]; then
+      $(gettop)/build/make/tapasHelp.sh
+      return
+    fi
+
     if [ $(echo $arch | wc -w) -gt 1 ]; then
         echo "tapas: Error: Multiple build archs supplied: $arch"
         return
diff --git a/tapasHelp.sh b/tapasHelp.sh
new file mode 100755
index 0000000000..058ac1db3e
--- /dev/null
+++ b/tapasHelp.sh
@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# locate some directories
+cd "$(dirname $0)"
+SCRIPT_DIR="${PWD}"
+cd ../..
+TOP="${PWD}"
+
+message='usage: tapas [<App1> <App2> ...] [arm|x86|mips|armv5|arm64|x86_64|mips64] [eng|userdebug|user]
+
+tapas selects individual apps to be built by the Android build system. Unlike
+"lunch", "tapas" does not request the building of images for a device.
+Additionally, an app built with "tapas" will have its dex file inside its apk,
+which should cause it to be suitable for installing on any api-compatible
+device. In other words, "tapas" configures the build of unbundled apps.
+
+The names <App1> <App2> ... should match LOCAL_PACKAGE_NAME as defined in an
+Android.mk
+
+The usage of the other arguments matches that of the rest of the platform
+build system and can be found by running `m help`'
+
+echo "$message"