Get logical imports in "wren_modules" working.

There's a lot of changes here and surely some rough edges to iron out.
Also, I need to update the docs. But I want to get closer to landing
this so I can build on it.

test/api/call.c

@@ -6,7 +6,7 @@
 void callRunTests(WrenVM* vm)
 {
   wrenEnsureSlots(vm, 1);
-  wrenGetVariable(vm, "test/api/call", "Call", 0);
+  wrenGetVariable(vm, "./test/api/call", "Call", 0);
   WrenHandle* callClass = wrenGetSlotHandle(vm, 0);
   
   WrenHandle* noParams = wrenMakeCallHandle(vm, "noParams");

test/api/get_variable.c

@@ -4,23 +4,23 @@
 
 static void beforeDefined(WrenVM* vm)
 {
-  wrenGetVariable(vm, "test/api/get_variable", "A", 0);
+  wrenGetVariable(vm, "./test/api/get_variable", "A", 0);
 }
 
 static void afterDefined(WrenVM* vm)
 {
-  wrenGetVariable(vm, "test/api/get_variable", "A", 0);
+  wrenGetVariable(vm, "./test/api/get_variable", "A", 0);
 }
 
 static void afterAssigned(WrenVM* vm)
 {
-  wrenGetVariable(vm, "test/api/get_variable", "A", 0);
+  wrenGetVariable(vm, "./test/api/get_variable", "A", 0);
 }
 
 static void otherSlot(WrenVM* vm)
 {
   wrenEnsureSlots(vm, 3);
-  wrenGetVariable(vm, "test/api/get_variable", "B", 2);
+  wrenGetVariable(vm, "./test/api/get_variable", "B", 2);
   
   // Move it into return position.
   const char* string = wrenGetSlotString(vm, 2);
@@ -29,7 +29,7 @@ static void otherSlot(WrenVM* vm)
 
 static void otherModule(WrenVM* vm)
 {
-  wrenGetVariable(vm, "test/api/get_variable_module", "Variable", 0);
+  wrenGetVariable(vm, "./test/api/get_variable_module", "Variable", 0);
 }
 
 WrenForeignMethodFn getVariableBindMethod(const char* signature)

test/api/main.c

@@ -25,7 +25,7 @@ static WrenForeignMethodFn bindForeignMethod(
     WrenVM* vm, const char* module, const char* className,
     bool isStatic, const char* signature)
 {
-  if (strncmp(module, "test/", 5) != 0) return NULL;
+  if (strncmp(module, "./test/", 7) != 0) return NULL;
 
   // For convenience, concatenate all of the method qualifiers into a single
   // signature string.
@@ -78,7 +78,7 @@ static WrenForeignClassMethods bindForeignClass(
     WrenVM* vm, const char* module, const char* className)
 {
   WrenForeignClassMethods methods = { NULL, NULL };
-  if (strncmp(module, "test/", 5) != 0) return methods;
+  if (strncmp(module, "./test/", 7) != 0) return methods;
 
   foreignClassBindClass(className, &methods);
   if (methods.allocate != NULL) return methods;

test/api/reset_stack_after_call_abort.c

@@ -6,7 +6,7 @@
 void resetStackAfterCallAbortRunTests(WrenVM* vm)
 {
   wrenEnsureSlots(vm, 1);
-  wrenGetVariable(vm, "test/api/reset_stack_after_call_abort", "Test", 0);
+  wrenGetVariable(vm, "./test/api/reset_stack_after_call_abort", "Test", 0);
   WrenHandle* testClass = wrenGetSlotHandle(vm, 0);
   
   WrenHandle* abortFiber = wrenMakeCallHandle(vm, "abortFiber()");

test/api/reset_stack_after_foreign_construct.c

@@ -22,7 +22,8 @@ void resetStackAfterForeignConstructBindClass(
 void resetStackAfterForeignConstructRunTests(WrenVM* vm)
 {
   wrenEnsureSlots(vm, 1);
-  wrenGetVariable(vm, "test/api/reset_stack_after_foreign_construct", "Test", 0);
+  wrenGetVariable(vm,
+      "./test/api/reset_stack_after_foreign_construct", "Test", 0);
   WrenHandle* testClass = wrenGetSlotHandle(vm, 0);
   
   WrenHandle* callConstruct = wrenMakeCallHandle(vm, "callConstruct()");

test/language/foreign/unknown_method.wren

@@ -1,3 +1,3 @@
 class Foo {
-  foreign someUnknownMethod // expect runtime error: Could not find foreign method 'someUnknownMethod' for class Foo in module 'test/language/foreign/unknown_method'.
+  foreign someUnknownMethod // expect runtime error: Could not find foreign method 'someUnknownMethod' for class Foo in module './test/language/foreign/unknown_method'.
 }

test/language/module/compile_error/compile_error.wren

@@ -1,2 +1,2 @@
 System.print("before") // expect: before
-import "./module" for Module // expect runtime error: Could not compile module 'test/language/module/compile_error/module'.
+import "./module" for Module // expect runtime error: Could not compile module './test/language/module/compile_error/module'.

test/language/module/logical_dir/logical_dir.wren

@@ -0,0 +1,6 @@
+// Import a module from within a named package.
+import "foo/within_foo" for Foo
+// expect: ran foo module
+// expect: ran bar module
+
+System.print(Foo) // expect: from foo

test/language/module/logical_dir/wren_modules/bar/within_bar.wren

@@ -0,0 +1,5 @@
+// nontest
+var Bar = "from bar"
+System.print("ran bar module")
+
+import "foo/within_foo"

test/language/module/logical_dir/wren_modules/foo/within_foo.wren

@@ -0,0 +1,5 @@
+// nontest
+var Foo = "from foo"
+System.print("ran foo module")
+
+import "bar/within_bar"

test/language/module/logical_short/logical_short.wren

@@ -0,0 +1,5 @@
+// Import a module whose name is the same as the package.
+import "foo" for Module
+// expect: ran module
+
+System.print(Module) // expect: from module

test/language/module/logical_short/wren_modules/foo/foo.wren

@@ -0,0 +1,3 @@
+// nontest
+var Module = "from module"
+System.print("ran module")

test/language/module/unknown_module.wren

@@ -1 +1 @@
-import "./does_not_exist" for DoesNotExist // expect runtime error: Could not load module 'test/language/module/does_not_exist'.
+import "./does_not_exist" for DoesNotExist // expect runtime error: Could not load module './test/language/module/does_not_exist'.

test/language/module/unknown_variable/unknown_variable.wren

@@ -1,3 +1,3 @@
 // Should execute the module:
 // expect: ran module
-import "./module" for DoesNotExist // expect runtime error: Could not find a variable named 'DoesNotExist' in module 'test/language/module/unknown_variable/module'.
+import "./module" for DoesNotExist // expect runtime error: Could not find a variable named 'DoesNotExist' in module './test/language/module/unknown_variable/module'.

test/language/module/use_nearest_modules_dir/a/b/use_nearest_modules_dir.wren

@@ -0,0 +1,3 @@
+// Stops as soon as it finds a wren_modules directory, regardless of whether or
+// not it contains the desired module.
+import "foo" // expect runtime error: Could not load module 'foo'.

test/language/module/use_nearest_modules_dir/wren_modules/foo/foo.wren

@@ -0,0 +1,2 @@
+// nontest
+System.print("ran foo module")

test/language/module/walk_up_for_modules_dir/a/b/walk_up_for_modules_dir.wren

@@ -0,0 +1,3 @@
+// Walk up parent directories from the root script to find "wren_modules".
+import "foo"
+// expect: ran foo module

test/language/module/walk_up_for_modules_dir/wren_modules/foo/foo.wren

@@ -0,0 +1,2 @@
+// nontest
+System.print("ran foo module")

test/meta/get_module_variables.wren

@@ -1,6 +1,6 @@
 import "meta" for Meta
 
-var variables = Meta.getModuleVariables("test/meta/get_module_variables")
+var variables = Meta.getModuleVariables("./test/meta/get_module_variables")
 
 // Includes implicitly imported core stuff.
 System.print(variables.contains("Object")) // expect: true

test/unit/path_test.c

@@ -9,40 +9,39 @@
 static void expectNormalize(const char* input, const char* expected)
 {
   Path* path = pathNew(input);
-  Path* result = pathNormalize(path);
+  pathNormalize(path);
   
-  if (strcmp(result->chars, expected) != 0)
+  if (strcmp(path->chars, expected) != 0)
   {
     printf("FAIL %-30s Want %s\n", input, expected);
-    printf("                                     Got %s\n\n", result->chars);
+    printf("                                     Got %s\n\n", path->chars);
     fail();
   }
   else
   {
 #if SHOW_PASSES
-    printf("PASS %-30s   -> %s\n", input, result->chars);
+    printf("PASS %-30s   -> %s\n", input, path->chars);
 #endif
     pass();
   }
   
   pathFree(path);
-  pathFree(result);
 }
 
 static void testNormalize()
 {
-  // simple cases
+  // Simple cases.
   expectNormalize("", ".");
   expectNormalize(".", ".");
   expectNormalize("..", "..");
   expectNormalize("a", "a");
   expectNormalize("/", "/");
   
-  // collapses redundant separators
+  // Collapses redundant separators.
   expectNormalize("a/b/c", "a/b/c");
   expectNormalize("a//b///c////d", "a/b/c/d");
   
-  // eliminates "." parts
+  // Eliminates "." parts, except one at the beginning.
   expectNormalize("./", ".");
   expectNormalize("/.", "/");
   expectNormalize("/./", "/");
@@ -50,10 +49,10 @@ static void testNormalize()
   expectNormalize("a/./b", "a/b");
   expectNormalize("a/.b/c", "a/.b/c");
   expectNormalize("a/././b/./c", "a/b/c");
-  expectNormalize("././a", "a");
+  expectNormalize("././a", "./a");
   expectNormalize("a/./.", "a");
   
-  // eliminates ".." parts
+  // Eliminates ".." parts.
   expectNormalize("..", "..");
   expectNormalize("../", "..");
   expectNormalize("../../..", "../../..");
@@ -68,7 +67,7 @@ static void testNormalize()
   expectNormalize("a/b/c/../../d/e/..", "a/d");
   expectNormalize("a/b/../../../../c", "../../c");
   
-  // does not walk before root on absolute paths
+  // Does not walk before root on absolute paths.
   expectNormalize("..", "..");
   expectNormalize("../", "..");
   expectNormalize("/..", "/");
@@ -84,7 +83,7 @@ static void testNormalize()
   expectNormalize("a/b/../../../../c", "../../c");
   expectNormalize("a/b/c/../../..d/./.e/f././", "a/..d/.e/f.");
   
-  // removes trailing separators
+  // Removes trailing separators.
   expectNormalize("./", ".");
   expectNormalize(".//", ".");
   expectNormalize("a/", "a");
@@ -94,7 +93,7 @@ static void testNormalize()
   expectNormalize("foo/bar/baz", "foo/bar/baz");
   expectNormalize("foo", "foo");
   expectNormalize("foo/bar/", "foo/bar");
-  expectNormalize("./foo/././bar/././", "foo/bar");
+  expectNormalize("./foo/././bar/././", "./foo/bar");
 }
 
 void testPath()