pass number straight away + renames for clarity

examples/jvm-interop/bridge.c

@@ -9,7 +9,7 @@
 #include <stdint.h>
 
 #include <jni.h>
-#include "HelloJNI.h"
+#include "javaSource_Greeter.h"
 
 
 void *roc_alloc(size_t size, unsigned int alignment)
@@ -207,19 +207,15 @@ size_t roc_str_len(struct RocStr str)
     }
 }
 
-extern void roc__mainForHost_1_exposed_generic(struct RocBytes *ret, struct RocBytes *arg);
+extern void roc__stringInterpolation_1_exposed_generic(struct RocBytes *ret, int32_t arg);
 
 JNIEXPORT jstring JNICALL Java_javaSource_Greeter_sayHello
    (JNIEnv *env, jobject thisObj, jint num)
 {
-    char native_string[256] = {0};
-    sprintf(native_string, "%d", num);
-
-    struct RocBytes arg = init_rocbytes((uint8_t *)native_string, strlen(native_string));
     struct RocBytes ret = {0};
 
     // Call the Roc function to populate `ret`'s bytes.
-    roc__mainForHost_1_exposed_generic(&ret, &arg);
+    roc__stringInterpolation_1_exposed_generic(&ret, (int32_t) num);
 
     // java being java making this a lot harder than it needs to be
     // https://stackoverflow.com/questions/32205446/getting-true-utf-8-characters-in-java-jni

examples/jvm-interop/build.sh

@@ -41,4 +41,4 @@ clang \
 clang -shared -o libinterop.so bridge.o -L. -lhello
 
 # then run
-# java javaSource.Greeter
+java javaSource.Greeter

examples/jvm-interop/main.roc

@@ -1,12 +1,12 @@
 app "libhello"
     packages { pf: "platform/main.roc" }
     imports []
-    provides [main] to pf
+    provides [interpolate] to pf
 
-main : U64 -> Str
-main = \num ->
+interpolate : I32 -> Str
+interpolate = \num ->
     if num == 0 then
-        "I need a positive number here!"
+        "I need a non-zero number here!"
     else
         str = Num.toStr num
         "The number was \(str), OH YEAH!!! 🤘🤘"

examples/jvm-interop/platform/host.c

@@ -80,12 +80,12 @@ size_t roc_str_len(struct RocStr str) {
   }
 }
 
-extern void roc__mainForHost_1_exposed_generic(struct RocStr *string);
+extern void roc__stringInterpolation_1_exposed_generic(struct RocStr *string);
 
 int main() {
 
   struct RocStr str;
-  roc__mainForHost_1_exposed_generic(&str);
+  roc__stringInterpolation_1_exposed_generic(&str);
 
   // Determine str_len and the str_bytes pointer,
   // taking into account the small string optimization.

examples/jvm-interop/platform/main.roc

@@ -1,12 +1,9 @@
 platform "jvm-interop"
-    requires {} { main : arg -> ret | arg has Decoding }
+    requires {} { interpolate : arg -> ret }
     exposes []
     packages {}
-    imports [Json]
-    provides [mainForHost]
+    imports []
+    provides [stringInterpolation]
 
-mainForHost : List U8 -> Str
-mainForHost = \json ->
-    when Decode.fromBytes json Json.fromUtf8 is
-        Ok arg -> main arg
-        Err _ -> "Decoding Error"
+stringInterpolation : I32 -> Str
+stringInterpolation = \arg -> interpolate arg