build-sdk: allow giving SDK_DIR on commandline

Allow giving the path to the SDK_DIR via commandline.
This makes it easier to build the project when having a custom directory
structure like fdroid's srclibs infrastructure.

app/build-sdk.sh

 #!/bin/bash
 
 CURRENT_DIR=$(pwd)
-# The SDK dir should be 2 directories up in the tree, so we use dirname 2 times
-# to get the common parent dir of the SDK and the app
 GIT=$(which git)
-cd ../..
-tmp=$(pwd)
-SDK_DIR="$tmp/Rocket.Chat.Kotlin.SDK"
-cd "${CURRENT_DIR}"
+
+if [ "$#" -eq 1 ] && [ ! -z "$1" ]; then
+    # if in an argument is given this is the (relative) path to SDK_DIR
+    SDK_DIR=$(readlink -f $1)
+else
+    # The SDK dir should be 2 directories up in the tree, so we use dirname 2 times
+    # to get the common parent dir of the SDK and the app
+    cd ../..
+    tmp=$(pwd)
+    SDK_DIR="$tmp/Rocket.Chat.Kotlin.SDK"
+    cd "${CURRENT_DIR}"
+fi
 
 echo "CURRENT DIR: $CURRENT_DIR"
 echo "SDK DIR: $SDK_DIR"
@@ -99,4 +105,4 @@ cp -v "${SDK_DIR}"/core/build/libs/core-0.1-SNAPSHOT.jar "${CURRENT_DIR}"/libs/c
 
 echo "$SHA" > "${SDK_DIR}"/.last_commit_hash
 
-exit 0
+exit 0
\ No newline at end of file

app/build.gradle

@@ -165,11 +165,13 @@ androidExtensions {
 
 // FIXME - build and install the sdk into the app/libs directory
 // We were having some issues with the kapt generated files from the sdk when importing as a module
+
+def sdk_location=project.properties['sdk_location'] ?: ""
 task compileSdk(type:Exec) {
     if (System.getProperty('os.name').toLowerCase(Locale.ROOT).contains('windows')) {
-        commandLine 'cmd', '/c', 'build-sdk.sh'
+        commandLine 'cmd', '/c', 'build-sdk.sh', sdk_location
     } else {
-        commandLine './build-sdk.sh'
+        commandLine './build-sdk.sh', sdk_location
     }
 }
 preBuild.dependsOn compileSdk