js: os now compiles to the JS backend, more builtins & minor codegen fixes (#11302)

vlib/os/file.js.v

@@ -0,0 +1,136 @@
+module os
+
+pub struct File {
+pub:
+	fd int
+pub mut:
+	is_opened bool
+}
+
+#const $buffer = require('buffer');
+
+// todo(playX):   __as_cast is broken here
+/*
+pub struct ErrFileNotOpened {
+	msg  string = 'os: file not opened'
+	code int
+}
+pub struct ErrSizeOfTypeIs0 {
+	msg  string = 'os: size of type is 0'
+	code int
+}
+fn error_file_not_opened() IError {
+	return IError(&ErrFileNotOpened{})
+}
+fn error_size_of_type_0() IError {
+	return IError(&ErrSizeOfTypeIs0{})
+}
+*/
+pub fn open_file(path string, mode string, options ...int) ?File {
+	mut res := File{}
+	$if js_node {
+		#if (!options) { options = new array([]); }
+		#let permissions = 0o666
+		#if (options.arr.length > 0) { permissions = options.arr[0]; }
+		#try {
+		#res.fd = new int($fs.openSync(''+path,''+mode,permissions))
+		#} catch (e) {
+		#return builtin.error('' + e);
+		#}
+
+		res.is_opened = true
+	} $else {
+		error('cannot open file on non NodeJS runtime')
+	}
+	return res
+}
+
+// open tries to open a file for reading and returns back a read-only `File` object.
+pub fn open(path string) ?File {
+	f := open_file(path, 'r') ?
+	return f
+}
+
+pub fn create(path string) ?File {
+	f := open_file(path, 'w') ?
+	return f
+}
+
+pub fn stdin() File {
+	return File{
+		fd: 0
+		is_opened: true
+	}
+}
+
+pub fn stdout() File {
+	return File{
+		fd: 1
+		is_opened: true
+	}
+}
+
+pub fn stderr() File {
+	return File{
+		fd: 2
+		is_opened: true
+	}
+}
+
+pub fn (f &File) read(mut buf []byte) ?int {
+	if buf.len == 0 {
+		return 0
+	}
+	mut nbytes := 0
+	#try {
+	#let buffer = $fs.readFileSync(f.fd.valueOf());
+	#
+	#for (const val of buffer.values()) { buf.arr[nbytes++] = val; }
+	#}
+	#catch (e) { return builtin.error('' + e); }
+
+	return nbytes
+}
+
+pub fn (mut f File) write(buf []byte) ?int {
+	if !f.is_opened {
+		return error('file is not opened')
+	}
+	mut nbytes := 0
+	#const b = $buffer.Buffer.from(buf.arr.map((x) => x.valueOf()))
+	#try { $fs.writeSync(f.fd.valueOf(),b,0,buf.len.valueOf(),0); } catch (e) { return builtin.error('' + e); }
+
+	return nbytes
+}
+
+// writeln writes the string `s` into the file, and appends a \n character.
+// It returns how many bytes were written, including the \n character.
+pub fn (mut f File) writeln(s string) ?int {
+	mut nbytes := f.write(s.bytes()) ?
+	nbytes += f.write('\n'.bytes()) ?
+	return nbytes
+}
+
+pub fn (mut f File) write_to(pos u64, buf []byte) ?int {
+	if !f.is_opened {
+		return error('file is not opened')
+	}
+	mut nbytes := 0
+	#const b = $buffer.Buffer.from(buf.arr.map((x) => x.valueOf()))
+	#try { $fs.writeSync(f.fd.valueOf(),b,0,buf.len.valueOf(),pos.valueOf()); } catch (e) { return builtin.error('' + e); }
+
+	return nbytes
+}
+
+// write_string writes the string `s` into the file
+// It returns how many bytes were actually written.
+pub fn (mut f File) write_string(s string) ?int {
+	nbytes := f.write(s.bytes()) ?
+	return nbytes
+}
+
+pub fn (mut f File) close() {
+	#f.valueOf().fd.close()
+}
+
+pub fn (mut f File) write_full_buffer(s voidptr, buffer_len size_t) ? {}

vlib/os/os.c.v

@@ -0,0 +1,21 @@
+module os
+
+// write_file_array writes the data in `buffer` to a file in `path`.
+pub fn write_file_array(path string, buffer array) ? {
+	mut f := create(path) ?
+	unsafe { f.write_full_buffer(buffer.data, size_t(buffer.len * buffer.element_size)) ? }
+	f.close()
+}
+
+pub fn glob(patterns ...string) ?[]string {
+	mut matches := []string{}
+	for pattern in patterns {
+		native_glob_pattern(pattern, mut matches) ?
+	}
+	matches.sort()
+	return matches
+}
+
+pub const (
+	args = []string{}
+)

vlib/os/os.js.v

@@ -4,9 +4,9 @@ module os
 #const $path = require('path');
 
 pub const (
-	args           = []string{}
 	path_delimiter = '/'
 	path_separator = '/'
+	args           = []string{}
 )
 
 $if js_node {

vlib/os/os.v

@@ -4,7 +4,6 @@
 module os
 
 pub const (
-	args          = []string{}
 	max_path_len  = 4096
 	wd_at_startup = getwd()
 )
@@ -344,22 +343,15 @@ pub fn write_file(path string, text string) ? {
 	f.close()
 }
 
-// write_file_array writes the data in `buffer` to a file in `path`.
-pub fn write_file_array(path string, buffer array) ? {
-	mut f := create(path) ?
-	unsafe { f.write_full_buffer(buffer.data, size_t(buffer.len * buffer.element_size)) ? }
-	f.close()
-}
-
 // executable_fallback is used when there is not a more platform specific and accurate implementation.
 // It relies on path manipulation of os.args[0] and os.wd_at_startup, so it may not work properly in
 // all cases, but it should be better, than just using os.args[0] directly.
 fn executable_fallback() string {
-	if os.args.len == 0 {
+	if args.len == 0 {
 		// we are early in the bootstrap, os.args has not been initialized yet :-|
 		return ''
 	}
-	mut exepath := os.args[0]
+	mut exepath := args[0]
 	$if windows {
 		if !exepath.contains('.exe') {
 			exepath += '.exe'
@@ -639,12 +631,3 @@ pub fn execute_or_exit(cmd string) Result {
 	}
 	return res
 }
-
-pub fn glob(patterns ...string) ?[]string {
-	mut matches := []string{}
-	for pattern in patterns {
-		native_glob_pattern(pattern, mut matches) ?
-	}
-	matches.sort()
-	return matches
-}

vlib/os/os_js.js.v

@@ -15,22 +15,25 @@ pub fn mkdir(path string) ?bool {
 
 pub fn is_dir(path string) bool {
 	res := false
-	#res.val = $fs.existsSync(path,str) && $fs.lstatSync(path.str).isDirectory()
-
+	$if js_node {
+		#res.val = $fs.existsSync(path,str) && $fs.lstatSync(path.str).isDirectory()
+	}
 	return res
 }
 
 pub fn is_link(path string) bool {
 	res := false
-	#res.val = $fs.existsSync(path.str) && $fs.lstatSync(path.str).isSymbolicLink()
-
+	$if js_node {
+		#res.val = $fs.existsSync(path.str) && $fs.lstatSync(path.str).isSymbolicLink()
+	}
 	return res
 }
 
 pub fn exists(path string) bool {
 	res := false
-	#res.val = $fs.existsSync(path.str)
-
+	$if js_node {
+		#res.val = $fs.existsSync(path.str)
+	}
 	return res
 }
 
@@ -40,8 +43,85 @@ pub fn ls(path string) ?[]string {
 	}
 
 	result := []string{}
-	#let i = 0
-	#$fs.readdirSync(path.str).forEach((path) => result.arr[i++] = new builtin.string(path))
-
+	$if js_node {
+		#let i = 0
+		#$fs.readdirSync(path.str).forEach((path) => result.arr[i++] = new builtin.string(path))
+	}
 	return result
 }
+
+pub fn get_raw_line() string {
+	return ''
+}
+
+pub fn executable() string {
+	return ''
+}
+
+pub fn is_executable(path string) bool {
+	eprintln('TODO: There is no isExecutable on fs.stats')
+	return false
+}
+
+pub fn rmdir(path string) ? {
+	$if js_node {
+		err := ''
+		#try {
+		#$fs.rmdirSync(path.str)
+		#return;
+		#} catch (e) {
+		#err.str = 'Failed to remove "' + path.str + '": ' + e.toString()
+		#}
+
+		return error(err)
+	}
+}
+
+pub fn rm(path string) ? {
+	$if js_node {
+		err := ''
+		#try {
+		#$fs.rmSync(path.str)
+		#return;
+		#} catch (e) {
+		#err.str = 'Failed to remove "' + path.str + '": ' + e.toString()
+		#}
+
+		return error(err)
+	}
+}
+
+pub fn cp(src string, dst string) ? {
+	$if js_node {
+		err := ''
+		#try {
+		#$fs.cpSync(src.str,dst.str);
+		#return;
+		#} catch (e) {
+		#err.str = 'failed to copy ' + src.str + ' to ' + dst.str + ': ' + e.toString();
+		#}
+
+		return error(err)
+	}
+}
+
+pub fn read_file(s string) ?string {
+	mut err := ''
+	err = err
+	res := ''
+	#try {
+	#res.str = $fs.readFileSync(s.str).toString()
+	#} catch (e) {
+	#err.str = 'Failed to read file: ' + e.toString()
+	#return error(err)
+	#}
+
+	return res
+}
+
+pub fn getwd() string {
+	res := ''
+	#res.str = $process.cwd()
+
+	return res
+}