comptime: support @VROOT again

cmd/tools/vtest-fixed.v

@@ -40,7 +40,6 @@ const (
 		'vlib/v/tests/num_lit_call_method_test.v',
 		'vlib/v/tests/option_test.v',
 		'vlib/v/tests/pointers_test.v',
-		'vlib/v/tests/project_with_c_code/main_test.v',
 		'vlib/v/tests/project_with_modules_having_submodules/bin/a_program_under_bin_can_find_mod1_test.v',
 		'vlib/v/tests/project_with_modules_having_submodules/tests/submodule_test.v',
 		'vlib/v/tests/repl/repl_test.v',

vlib/v/builder/builder.v

@@ -15,7 +15,6 @@ import (
 
 pub struct Builder {
 pub:
-	mod_file_cacher     &ModFileCacher // used during lookup for v.mod to support @VROOT
 	pref                &pref.Preferences
 	table               &table.Table
 	checker             checker.Checker
@@ -33,7 +32,6 @@ pub fn new_builder(pref &pref.Preferences) Builder {
 	compiled_dir := if os.is_dir(rdir) { rdir } else { os.dir(rdir) }
 	table := table.new_table()
 	return builder.Builder{
-		mod_file_cacher: new_mod_file_cacher()
 		pref: pref
 		table: table
 		checker: checker.new_checker(table, pref)

vlib/v/parser/comptime.v

@@ -6,6 +6,7 @@ module parser
 import (
 	v.ast
 	v.pref
+	v.vmod
 )
 
 const (
@@ -22,18 +23,14 @@ fn (p mut Parser) hash() ast.HashStmt {
 		mut flag := val[5..]
 		// expand `@VROOT` to its absolute path
 		if flag.contains('@VROOT') {
-			/*
-			vmod_file_location := p.v.mod_file_cacher.get( p.file_path_dir )
-        if vmod_file_location.vmod_file.len == 0 {
-                // There was no actual v.mod file found.
-                p.error_with_token_index('To use @VROOT, you need' +
-                        ' to have a "v.mod" file in ${p.file_path_dir},' +
-                        ' or in one of its parent folders.',
-                        p.cur_tok_index() - 1)
-        }
-        flag = flag.replace('@VROOT', vmod_file_location.vmod_folder )
-			flag = flag.replace('@VROOT', '/Users/alex/code/v/')
-*/
+			vmod_file_location := vmod.mod_file_cacher.get( p.file_name_dir )
+			if vmod_file_location.vmod_file.len == 0 {
+				// There was no actual v.mod file found.
+				p.error('To use @VROOT, you need' +
+					' to have a "v.mod" file in ${p.file_name_dir},' +
+					' or in one of its parent folders.')
+			}
+			flag = flag.replace('@VROOT', vmod_file_location.vmod_folder )
 		}
 		for deprecated in ['@VMOD', '@VMODULE', '@VPATH', '@VLIB_PATH'] {
 			if flag.contains(deprecated) {

vlib/v/parser/parser.v

@@ -16,7 +16,8 @@ import (
 
 struct Parser {
 	scanner           &scanner.Scanner
-	file_name         string
+	file_name         string // "/home/user/hello.v"
+	file_name_dir     string // "/home/user"
 mut:
 	tok               token.Token
 	peek_tok          token.Token
@@ -67,6 +68,7 @@ pub fn parse_file(path string, table &table.Table, comments_mode scanner.Comment
 		scanner: scanner.new_scanner_file(path, comments_mode)
 		table: table
 		file_name: path
+		file_name_dir: os.dir( path )
 		pref: pref
 		scope: &ast.Scope{
 			start_pos: 0

vlib/v/vmod/vmod.v

@@ -1,8 +1,7 @@
-module builder
+module vmod
 
 import os
 
-
 // This file provides a caching mechanism for seeking quickly whether a
 // given folder has a v.mod file in it or in any of its parent folders.
 //
@@ -144,3 +143,7 @@ fn (mcache mut ModFileCacher) get_files(cfolder string) []string {
 	mcache.folder_files[ cfolder ] = files
 	return files
 }
+
+pub const (
+	mod_file_cacher = new_mod_file_cacher() // used during lookup for v.mod to support @VROOT
+)