module os $if js_node { #const $child_process = require('child_process') } // new_process - create a new process descriptor // NB: new does NOT start the new process. // That is done because you may want to customize it first, // by calling different set_ methods on it. // In order to start it, call p.run() or p.wait() pub fn new_process(filename string) &Process { return &Process{ filename: filename stdio_fd: [-1, -1, -1]! } } fn (mut p Process) spawn_internal() { #p.val.pid = $child_process.spawn( #p.val.filename+'', #p.val.args.arr.map((x) => x.valueOf() + ''), #{ #env: (p.val.env_is_custom ? p.val.env : $process.env), #}) #p.val.pid.on('error', function (err) { builtin.panic('Failed to start subprocess') }) p.status = .running if p.use_stdio_ctl { #p.val.pid.stdout.pipe(process.stdout) #p.val.pid.stdin.pipe(process.stdin) #p.val.pid.stderr.pipe(process.stderr) } } pub fn (mut p Process) run() { if p.status != .not_started { return } p.spawn_internal() return } pub fn (mut p Process) signal_kill() { if p.status !in [.running, .stopped] { return } #p.val.pid.kill('SIGKILL'); p.status = .aborted } pub fn (mut p Process) signal_stop() { if p.status !in [.running, .stopped] { return } #p.val.pid.kill('SIGSTOP'); p.status = .aborted } pub fn (mut p Process) signal_continue() { if p.status != .stopped { return } #p.val.pid.kill('SIGCONT'); p.status = .running return } pub fn (mut p Process) wait() { if p.status == .not_started { p.spawn_internal() } if p.status !in [.running, .stopped] { return } p.wait_internal() return } fn (mut p Process) wait_internal() { #p.val.pid.on('exit', function (code) { console.log(code) }) } pub fn (mut p Process) set_redirect_stdio() { p.use_stdio_ctl = true return } pub fn (mut p Process) stdin_write(s string) { p.check_redirection_call('stdin_write') #p.val.pid.stdin.write(s) } pub fn (mut p Process) stdin_resume() { #p.val.pid.stdin.resume() } // todo(playX): probably does not work // will read from stdout pipe, will only return when EOF (end of file) or data // means this will block unless there is data pub fn (mut p Process) stdout_slurp() string { p.check_redirection_call('stdout_slurp') mut res := '' #p.val.pid.stdout.on('data', function (data) { res = new string(data) }) return res } // _check_redirection_call - should be called just by stdxxx methods fn (mut p Process) check_redirection_call(fn_name string) { if !p.use_stdio_ctl { panic('Call p.set_redirect_stdio() before calling p.$fn_name') } if p.status == .not_started { panic('Call p.${fn_name}() after you have called p.run()') } } pub fn (mut p Process) close() { // no-op on JS backend }