all: make `os` global in scripts (#5669)

vlib/v/builder/builder.v

@@ -57,14 +57,17 @@ pub fn new_builder(pref &pref.Preferences) Builder {
 // parse all deps from already parsed files
 pub fn (mut b Builder) parse_imports() {
 	mut done_imports := []string{}
+		if b.pref.is_script {
+			done_imports << 'os'
+		}
 	// NB: b.parsed_files is appended in the loop,
 	// so we can not use the shorter `for in` form.
 	for i := 0; i < b.parsed_files.len; i++ {
 		ast_file := b.parsed_files[i]
-		for _, imp in ast_file.imports {
+		for imp in ast_file.imports {
 			mod := imp.mod
 			if mod == 'builtin' {
-				verror('cannot import module "$mod"')
+				verror('cannot import module "builtin"')
 				break
 			}
 			if mod in done_imports {
@@ -88,7 +91,7 @@ pub fn (mut b Builder) parse_imports() {
 			for file in parsed_files {
 				if file.mod.name != mod {
 					// v.parsers[pidx].error_with_token_index('bad module definition: ${v.parsers[pidx].file_path} imports module "$mod" but $file is defined as module `$p_mod`', 1
-					verror('bad module definition: ${ast_file.path} imports module "$mod" but $file.path is defined as module `$file.mod.name`')
+					verror('bad module definition: $ast_file.path imports module "$mod" but $file.path is defined as module `$file.mod.name`')
 				}
 			}
 			b.parsed_files << parsed_files
@@ -109,16 +112,14 @@ pub fn (mut b Builder) resolve_deps() {
 	graph := b.import_graph()
 	deps_resolved := graph.resolve()
 	cycles := deps_resolved.display_cycles()
-	if cycles.len > 1 {
-		eprintln('warning: import cycle detected between the following modules: \n' + cycles)
-		// TODO: error, when v itself does not have v.table -> v.ast -> v.table cycles anymore
-		return
-	}
 	if b.pref.is_verbose {
 		eprintln('------ resolved dependencies graph: ------')
 		eprintln(deps_resolved.display())
 		eprintln('------------------------------------------')
 	}
+	if cycles.len > 1 {
+		verror('error: import cycle detected between the following modules: \n' + cycles)
+	}
 	mut mods := []string{}
 	for node in deps_resolved.nodes {
 		mods << node.name
@@ -148,8 +149,14 @@ pub fn (b &Builder) import_graph() &depgraph.DepGraph {
 		mut deps := []string{}
 		if p.mod.name !in builtins {
 			deps << 'builtin'
+			if b.pref.backend == .c {
+				// TODO JavaScript backend doesn't handle os for now
+				if b.pref.is_script && p.mod.name != 'os' {
+					deps << 'os'
+				}
+			}
 		}
-		for _, m in p.imports {
+		for m in p.imports {
 			deps << m.mod
 		}
 		graph.add(p.mod.name, deps)
@@ -200,7 +207,8 @@ pub fn (b Builder) find_module_path(mod, fpath string) ?string {
 	vmod_file_location := mcache.get_by_file(fpath)
 	mod_path := module_path(mod)
 	mut module_lookup_paths := []string{}
-	if vmod_file_location.vmod_file.len != 0 && vmod_file_location.vmod_folder !in b.module_search_paths {
+	if vmod_file_location.vmod_file.len != 0 &&
+		vmod_file_location.vmod_folder !in b.module_search_paths {
 		module_lookup_paths << vmod_file_location.vmod_folder
 	}
 	module_lookup_paths << b.module_search_paths
@@ -274,7 +282,7 @@ fn (b &Builder) print_warnings_and_errors() {
 						f := stmt as ast.FnDecl
 						if f.name == fn_name {
 							fline := f.pos.line_nr
-							println('${file.path}:${fline}:')
+							println('$file.path:$fline:')
 						}
 					}
 				}

vlib/v/builder/compile.v

@@ -36,7 +36,7 @@ pub fn compile(command string, pref &pref.Preferences) {
 		.x64 { b.compile_x64() }
 	}
 	if pref.is_stats {
-		println('compilation took: ${sw.elapsed().milliseconds()} ms')
+		println('compilation took: $sw.elapsed().milliseconds() ms')
 	}
 	// running does not require the parsers anymore
 	b.myfree()
@@ -59,9 +59,7 @@ fn (mut b Builder) run_compiled_executable_and_exit() {
 	if b.pref.is_verbose {
 		println('============ running $b.pref.out_name ============')
 	}
-	
+	mut cmd := '"$b.pref.out_name"'
-	mut cmd := '"${b.pref.out_name}"'
-	
 	if b.pref.backend == .js {
 		cmd = 'node "${b.pref.out_name}.js"'
 	}
@@ -138,16 +136,23 @@ pub fn (v Builder) get_builtin_files() []string {
 	// Lookup for built-in folder in lookup path.
 	// Assumption: `builtin/` folder implies usable implementation of builtin
 	for location in v.pref.lookup_path {
-		if !os.exists(os.join_path(location, 'builtin')) {
+		if os.exists(os.join_path(location, 'builtin')) {
-			continue
+			mut builtin_files := []string{}
+			if v.pref.is_bare {
+				builtin_files << v.v_files_from_dir(os.join_path(location, 'builtin', 'bare'))
+			} else if v.pref.backend == .js {
+				builtin_files << v.v_files_from_dir(os.join_path(location, 'builtin', 'js'))
+			} else {
+				builtin_files << v.v_files_from_dir(os.join_path(location, 'builtin'))
+			}
+			if v.pref.backend == .c {
+				// TODO JavaScript backend doesn't handle os for now
+				if v.pref.is_script && os.exists(os.join_path(location, 'os')) {
+					builtin_files << v.v_files_from_dir(os.join_path(location, 'os'))
+				}
+			}
+			return builtin_files
 		}
-		if v.pref.is_bare {
-			return v.v_files_from_dir(os.join_path(location, 'builtin', 'bare'))
-		}
-		if v.pref.backend == .js {
-			return v.v_files_from_dir(os.join_path(location, 'builtin', 'js'))
-		}
-		return v.v_files_from_dir(os.join_path(location, 'builtin'))
 	}
 	// Panic. We couldn't find the folder.
 	verror('`builtin/` not included on module lookup path.
@@ -227,11 +232,11 @@ pub fn (v Builder) get_user_files() []string {
 		// Just compile one file and get parent dir
 		user_files << single_v_file
 		if v.pref.is_verbose {
-			v.log('> just compile one file: "${single_v_file}"')
+			v.log('> just compile one file: "$single_v_file"')
 		}
 	} else {
 		if v.pref.is_verbose {
-			v.log('> add all .v files from directory "${dir}" ...')
+			v.log('> add all .v files from directory "$dir" ...')
 		}
 		// Add .v files from the directory being compiled
 		user_files << v.v_files_from_dir(dir)

vlib/v/checker/checker.v

@@ -1021,6 +1021,14 @@ pub fn (mut c Checker) call_fn(mut call_expr ast.CallExpr) table.Type {
 			f = f1
 		}
 	}
+	if c.pref.is_script && !found {
+		os_name := 'os.$fn_name'
+		if f1 := c.table.find_fn(os_name) {
+			call_expr.name = os_name
+			found = true
+			f = f1
+		}
+	}
 	// check for arg (var) of fn type
 	if !found {
 		scope := c.file.scope.innermost(call_expr.pos.pos)
@@ -1181,7 +1189,6 @@ pub fn (mut c Checker) call_fn(mut call_expr ast.CallExpr) table.Type {
 			return true
 		}
 		*/
-
 		if !c.check_types(typ, arg.typ) {
 			// str method, allow type with str method if fn arg is string
 			if arg_typ_sym.kind == .string && typ_sym.has_method('str') {

vlib/v/parser/parser.v

@@ -115,10 +115,12 @@ pub fn parse_file(path string, b_table &table.Table, comments_mode scanner.Comme
 		global_scope: global_scope
 	}
 	if pref.is_vet && p.scanner.text.contains('\n        ') {
-		source_lines := os.read_lines(path) or { []string{} }
+		source_lines := os.read_lines(path) or {
+			[]string{}
+		}
 		for lnumber, line in source_lines {
 			if line.starts_with('        ') {
-				eprintln('${p.scanner.file_path}:${lnumber+1}: Looks like you are using spaces for indentation.')
+				eprintln('$p.scanner.file_path:${lnumber+1}: Looks like you are using spaces for indentation.')
 			}
 		}
 		eprintln('NB: You can run `v fmt -w file.v` to fix these automatically')
@@ -598,7 +600,7 @@ pub fn (mut p Parser) stmt(is_top_level bool) ast.Stmt {
 			p.error_with_pos('const can only be defined at the top level (outside of functions)',
 				p.tok.position())
 		}
-			// literals, 'if', etc. in here
+		// literals, 'if', etc. in here
 		else {
 			return p.parse_multi_expr(is_top_level)
 		}