use .cache instead of _cache, because currently V allows for `import …

…_cache`, but not `import .cache`

cmd/tools/vpm/settings.v

@@ -39,7 +39,7 @@ fn init_settings() VpmSettings {
 	}
 	if !is_ci && !is_dbg {
 		// Log by default:
-		cache_path := os.join_path(vmodules_path, '_cache')
+		cache_path := os.join_path(vmodules_path, '.cache')
 		os.mkdir_all(cache_path, mode: 0o700) or { panic(err) }
 		logger.set_output_path(os.join_path(cache_path, 'vpm.log'))
 	}

cmd/tools/vpm/vpm.v

@@ -14,7 +14,7 @@ const default_vpm_server_urls = ['https://vpm.vlang.io', 'https://vpm.url4e.com'
 const vpm_server_urls = rand.shuffle_clone(default_vpm_server_urls) or { [] } // ensure that all queries are distributed fairly
 const valid_vpm_commands = ['help', 'search', 'install', 'update', 'upgrade', 'outdated', 'list',
 	'remove', 'show']
-const excluded_dirs = ['_cache', 'vlib']
+const excluded_dirs = ['.cache', 'vlib']
 
 fn main() {
 	// This tool is intended to be launched by the v frontend,

vlib/v/gen/c/embed.v

@@ -34,7 +34,7 @@ fn (mut g Gen) gen_embed_file_init(mut node ast.ComptimeCall) {
 		if node.embed_file.compression_type == 'none' {
 			node.embed_file.bytes = file_bytes
 		} else {
-			cache_dir := os.join_path(os.vmodules_dir(), '_cache', 'embed_file')
+			cache_dir := os.join_path(os.vmodules_dir(), '.cache', 'embed_file')
 			cache_key := rand.ulid()
 			// cache_key := md5.hexhash(node.embed_file.apath)
 			if !os.exists(cache_dir) {

vlib/v/tests/multiple_paths_in_vmodules/path1/.gitignore

@@ -1,4 +1,4 @@
 ## this folder is the first one that will be put in vmodules.
 ## V uses that to put there its cache too.
 ## Just ignore it for now.
-_cache/
+.cache/

vlib/v/vcache/vcache.v

@@ -37,7 +37,7 @@ pub mut:
 pub fn new_cache_manager(opts []string) CacheManager {
 	mut vcache_basepath := os.getenv('VCACHE')
 	if vcache_basepath == '' {
-		vcache_basepath = os.join_path(os.vmodules_dir(), '_cache') // use a path, that would not conflict with a user installable module
+		vcache_basepath = os.join_path(os.vmodules_dir(), '.cache') // use a path, that would not conflict with a user installable module
 	}
 	nlog(@FN, 'vcache_basepath: ${vcache_basepath}\n         opts: ${opts}\n      os.args: ${os.args.join(' ')}')
 	dlog(@FN, 'vcache_basepath: ${vcache_basepath} | opts:\n     ${opts}')