compiler: move prelude files to tools/preludes/

tools/modules/testing/common.v

@@ -140,7 +140,7 @@ pub fn v_build_failing(zargs string, folder string) bool {
 	eprintln('   v compiler args: "$vargs"')
 	mut session := new_test_session(vargs)
 	files := os.walk_ext(filepath.join(parent_dir,folder), '.v')
-	mains := files.filter(!it.contains('modules'))
+	mains := files.filter(!it.contains('modules') && !it.contains('preludes'))
 	session.files << mains
 	session.test()
 	eprintln(session.benchmark.total_message(finish_label))

tools/preludes/README.md

@@ -0,0 +1,28 @@
+# V preludes:
+
+The tools/preludes/ contains small v code snippets, that V uses when 
+compiling certain v programs. V adds the files below automatically itself.
+Each file is used in different situations (see below).
+
+NB: preludes are *NOT* intended to be used by user programs/modules.
+The folder tools/preludes/ is *NOT* a v module.
+
+## Details:
+
+### tools/preludes/live_main.v
+Used when compiling live programs. This file is used by the main executable
+live program, that starts the file change monitoring thread. Each live program
+needs module `os` and module `time`, in order for the background file change 
+monitoring thread to work properly.
+
+### tools/preludes/live_shared.v
+Used when compiling live programs, for the shared library portion of the live 
+programs, that is reloaded each time the code is changed.
+
+### tools/preludes/tests_assertions.v  
+Used when compiling `_test.v` programs. 
+It specifies how failed assertions will look.
+
+### tools/preludes/tests_with_stats.v
+Used when compiling `_test.v` programs with -stats option. 
+It specifies how the result will appear ('assert' vs 'asserts' and so on).

tools/vtest-fmt.v

@@ -15,10 +15,10 @@ const (
 	'./vlib/builtin/js/hashmap.v',
 	'./vlib/compiler/tests/fn_variadic_test.v',
 	'./vlib/compiler/tests/generic_test.v',
-	'./vlib/compiler/preludes/live_main.v',
-	'./vlib/compiler/preludes/live_shared.v',
-	'./vlib/compiler/preludes/tests_assertions.v',
-	'./vlib/compiler/preludes/tests_with_stats.v',
+	'./tools/preludes/live_main.v',
+	'./tools/preludes/live_shared.v',
+	'./tools/preludes/tests_assertions.v',
+	'./tools/preludes/tests_with_stats.v',
 	'./vlib/crypto/aes/aes.v',
 	'./vlib/crypto/aes/aes_cbc.v',
 	'./vlib/crypto/aes/block_generic.v',

vlib/compiler/main.v

@@ -828,7 +828,10 @@ pub fn (v &V) get_user_files() []string {
 	// Need to store user files separately, because they have to be added after
 	// libs, but we dont know	which libs need to be added yet
 	mut user_files := []string
-	preludes_path := filepath.join(v.pref.vlib_path,'compiler','preludes')
+    
+    // See tools/preludes/README.md for more info about what preludes are
+	vroot := filepath.dir(vexe_path())    
+	preludes_path := filepath.join(vroot,'tools','preludes')
 	if v.pref.is_live {
 		user_files << filepath.join(preludes_path,'live_main.v')
 	}
@@ -841,6 +844,7 @@ pub fn (v &V) get_user_files() []string {
 	if v.pref.is_test && v.pref.is_stats {
 		user_files << filepath.join(preludes_path,'tests_with_stats.v')
 	}
+    
 	is_test := dir.ends_with('_test.v')
 	mut is_internal_module_test := false
 	if is_test {