chore(sdk) separate build and install of .wasm examples

The behavior of the scripts is still not as ideal as a Make-like
dependency check on the source files and target outputs going
example-by-example, but it is a step in the right direction:

* check that some .wasm files are actually present when deciding
  to skip the build
* always install .wasm files into the target location, even when
  build is skipped

util/sdks/assemblyscript.sh

@@ -70,10 +70,11 @@ build_assemblyscript_sdk() {
 
     if [[ -f "$DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK/.hash" \
           && $(cat "$DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK/.hash") == $(echo $hash_src)
-          && -z "$clean" ]];
+          && -z "$clean" ]] && \
+       find $DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK -name '*.wasm' | grep -q .
     then
         notice "AssemblyScript examples already built"
-        exit
+        return
     fi
 
     echo $hash_src > "$DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK/.hash"
@@ -87,7 +88,17 @@ build_assemblyscript_sdk() {
         pushd $example
             npm install
             npm run asbuild
-            cp build/debug.wasm $DIR_TESTS_LIB_WASM/assemblyscript_$name.wasm
+        popd
+    done
+}
+
+install_assemblyscript_sdk_examples() {
+    for example in $DIR_PROXY_WASM_ASSEMBLYSCRIPT_SDK/examples/*; do
+        name=$(basename $example)
+        name=$(echo $name | sed 's/-/_/g')
+
+        pushd $example
+            cp -av build/debug.wasm $DIR_TESTS_LIB_WASM/assemblyscript_$name.wasm
         popd
     done
 }
@@ -103,4 +114,5 @@ if [ "$mode" = "download" ]; then
 
 else
     build_assemblyscript_sdk "$version" "$clean"
+    install_assemblyscript_sdk_examples
 fi

util/sdks/go.sh

@@ -66,10 +66,11 @@ build_go_sdk() {
     if [[ -d "$DIR_PATCHED_PROXY_WASM_GO_SDK" \
           && -f "$DIR_PATCHED_PROXY_WASM_GO_SDK/.hash" \
           && $(cat "$DIR_PATCHED_PROXY_WASM_GO_SDK/.hash") == $(echo $hash_src)
-          && -z "$clean" ]];
+          && -z "$clean" ]] && \
+       find $DIR_PATCHED_PROXY_WASM_GO_SDK -name '*.wasm' | grep -q .
     then
         notice "Go examples already built"
-        exit
+        return
     fi
 
     rm -rf $DIR_PATCHED_PROXY_WASM_GO_SDK
@@ -105,7 +106,11 @@ EOF
         notice "compiling Go examples..."
 
         make build.examples || exit 0
+    popd
+}
 
+install_go_sdk_examples() {
+    pushd $DIR_PATCHED_PROXY_WASM_GO_SDK
         cd examples
 
         find . -name "*.wasm" | while read f; do
@@ -128,4 +133,5 @@ if [ "$mode" = "download" ]; then
 
 else
     build_go_sdk "$version" "$clean"
+    install_go_sdk_examples
 fi