Make new Rust sysprop usage consistent with others.

Author: ZachBray

sbe-tool/src/main/java/uk/co/real_logic/sbe/SbeTool.java

@@ -150,6 +150,16 @@ public class SbeTool
      */
     public static final String CPP_NAMESPACES_COLLAPSE = "sbe.cpp.namespaces.collapse";
 
+    /**
+     * Version of the Rust crate to generate.
+     */
+    public static final String RUST_CRATE_VERSION = "sbe.rust.crate.version";
+
+    /**
+     * The default version of the Rust crate to generate, when not specified via the system property.
+     */
+    public static final String RUST_DEFAULT_CRATE_VERSION = "0.1.0";
+
     /**
      * Boolean system property to turn on or off generation of the interface hierarchy. Defaults to false.
      */

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/TargetCodeGeneratorLoader.java

@@ -142,6 +142,7 @@ public CodeGenerator newInstance(final Ir ir, final String outputDir)
         {
             return new RustGenerator(
                 ir,
+                System.getProperty(RUST_CRATE_VERSION, RUST_DEFAULT_CRATE_VERSION),
                 new RustOutputManager(outputDir, ir.packageName()));
         }
     };

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/rust/RustGenerator.java

@@ -48,7 +48,6 @@
  */
 public class RustGenerator implements CodeGenerator
 {
-    private static final String CRATE_VERSION = System.getProperty("sbe.rust.crate.version");
     static final String WRITE_BUF_TYPE = "WriteBuf";
     static final String READ_BUF_TYPE = "ReadBuf";
     static final String BUF_LIFETIME = "'a";
@@ -81,21 +80,26 @@ interface ParentDef
 
     private final Ir ir;
     private final RustOutputManager outputManager;
+    private final String crateVersion;
 
     /**
      * Create a new Rust language {@link CodeGenerator}.
      *
      * @param ir            for the messages and types.
+     * @param crateVersion  for the generated crate.
      * @param outputManager for generating the codecs to.
      */
     public RustGenerator(
         final Ir ir,
+        final String crateVersion,
         final OutputManager outputManager)
     {
         Verify.notNull(ir, "ir");
+        Verify.notNull(crateVersion, "crateVersion");
         Verify.notNull(outputManager, "outputManager");
 
         this.ir = ir;
+        this.crateVersion = crateVersion;
         this.outputManager = (RustOutputManager)outputManager;
     }
 
@@ -115,11 +119,10 @@ public void generate() throws IOException
             {
                 namespace = (ir.namespaceName() + "_" + packageName).toLowerCase();
             }
-            final String version = CRATE_VERSION == null ? "0.1.0" : CRATE_VERSION;
 
             indent(writer, 0, "[package]\n");
             indent(writer, 0, "name = \"%s\"\n", namespace);
-            indent(writer, 0, "version = \"%s\"\n", version);
+            indent(writer, 0, "version = \"%s\"\n", crateVersion);
             indent(writer, 0, "authors = [\"sbetool\"]\n");
             indent(writer, 0, "description = \"%s\"\n", ir.description());
             indent(writer, 0, "edition = \"2021\"\n\n");