v: split the interpreter to cmd/tools/vinterpret.v

cmd/tools/check_os_api_parity.v

@@ -98,7 +98,7 @@ fn (app App) gen_api_for_module_in_os(mod_name string, os_name string) string {
 	tmpname := '/tmp/${mod_name}_${os_name}.c'
 	prefs, _ := pref.parse_args([], ['-os', os_name, '-o', tmpname, '-shared', mpath])
 	mut b := builder.new_builder(prefs)
-	b.compile_c()
+	builder.compile_c(mut b)
 	mut res := []string{}
 	for f in b.parsed_files {
 		for s in f.stmts {

cmd/tools/vinterpret.v

@@ -0,0 +1,24 @@
+module main
+
+import v.pref
+import v.eval
+import v.util
+import v.builder
+
+fn main() {
+	mut args_and_flags := util.join_env_vflags_and_os_args()[1..].filter(it != 'interpret')
+	prefs, _ := pref.parse_args([], args_and_flags)
+	builder.compile('interpret', prefs, v_interpret)
+}
+
+fn v_interpret(mut b builder.Builder) {
+	mut files := b.get_builtin_files()
+	files << b.get_user_files()
+	b.set_module_lookup_paths()
+	b.front_and_middle_stages(files) or { return }
+
+	util.timing_start('INTERPRET')
+	mut e := eval.new_eval(b.table, b.pref)
+	e.eval(b.parsed_files)
+	util.timing_measure('INTERPRET')
+}

cmd/v/v.v

@@ -27,6 +27,7 @@ const (
 		'doctor',
 		'fmt',
 		'gret',
+		'interpret',
 		'repl',
 		'self',
 		'setup-freetype',
@@ -61,10 +62,9 @@ fn main() {
 	timers.show('v start')
 	timers.start('parse_CLI_args')
 	args := os.args[1..]
-	// args = 123
 	if args.len == 0 || args[0] in ['-', 'repl'] {
-		// Running `./v` without args launches repl
 		if args.len == 0 {
+			// Running `./v` without args launches repl
 			if os.is_atty(0) != 0 {
 				cmd_exit := term.highlight_command('exit')
 				cmd_help := term.highlight_command('v help')
@@ -125,11 +125,26 @@ fn main() {
 		}
 		else {}
 	}
-	if command in ['run', 'build', 'build-module', 'interpret'] || command.ends_with('.v')
-		|| os.exists(command) {
+	if command in ['run', 'build', 'build-module'] || command.ends_with('.v') || os.exists(command) {
 		// println('command')
 		// println(prefs.path)
-		builder.compile(command, prefs)
+		backend_cb := match prefs.backend {
+			.c {
+				builder.FnBackend(builder.compile_c)
+			}
+			.js_node, .js_freestanding, .js_browser {
+				builder.compile_js
+			}
+			.native {
+				builder.compile_native
+			}
+			.interpret {
+				eprintln('use `v interpret file.v`')
+				exit(1)
+				builder.compile_c
+			}
+		}
+		builder.compile(command, prefs, backend_cb)
 		return
 	}
 	if prefs.is_help {