cmd: enable `v translate`, download and install c2v

cmd/tools/translate.v

@@ -0,0 +1,44 @@
+// Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
+module main
+
+import os
+import v.util
+
+fn main() {
+	vmodules := os.vmodules_dir()
+	c2v_dir := os.join_path(vmodules, 'c2v_alpha')
+	c2v_bin := os.join_path(c2v_dir, 'c2v')
+	// Git clone c2v
+	if !os.exists(c2v_dir) {
+		println('C2V is not installed. Downloading C2V...')
+		println(vmodules)
+		os.chdir(vmodules)?
+		res := os.execute('git clone --depth 1 git@github.com:/vlang/c2v_alpha.git')
+		if res.exit_code != 0 {
+			eprintln('Failed to download C2V. Perhaps it is not released yet? Is it June 20 yet?')
+			return
+		}
+	}
+	// Compile c2v
+	if !os.exists(c2v_bin) {
+		os.chdir(c2v_dir)?
+		res2 := os.execute('v -d trace_verbose -g -o c2v -experimental -w .')
+		if res2.exit_code != 0 {
+			eprintln('Failed to compile C2V. This should never happen, please report it via GitHub.')
+			return
+		}
+	}
+	if os.args.len < 3 {
+		eprintln('Wrong number of args. Use `v translate file.c`.')
+		return
+	}
+	passed_args := util.args_quote_paths(os.args[2..])
+	// println(passed_args)
+	res := os.execute('$c2v_bin $passed_args')
+	if res.exit_code != 0 {
+		eprintln('C2V failed to translate this file. This should never happen, please report it via GitHub.')
+	}
+	println('Success!')
+	// println(res.output)
+}

cmd/v/v.v

@@ -123,8 +123,9 @@ fn main() {
 			exit(1)
 		}
 		'translate' {
-			eprintln('Translating C to V will be available in V 0.3')
-			exit(1)
+			util.launch_tool(prefs.is_verbose, 'translate', os.args[1..])
+			// exit(1)
+			// return
 		}
 		else {
 			if command.ends_with('.v') || os.exists(command) {