selfcare init

proxy_go/public/go-telnet@v0.0.0-20180421082511-9ff0b2ab096e/telsh/help.go

@@ -0,0 +1,120 @@
+package telsh
+
+
+import (
+	"github.com/reiver/go-oi"
+	"github.com/reiver/go-telnet"
+
+	"io"
+	"sort"
+)
+
+
+type internalHelpProducer struct {
+	shellHandler *ShellHandler
+}
+
+
+func Help(shellHandler *ShellHandler) Producer {
+	producer := internalHelpProducer{
+		shellHandler:shellHandler,
+	}
+
+	return &producer
+}
+
+
+func (producer *internalHelpProducer) Produce(telnet.Context, string, ...string) Handler {
+	return newHelpHandler(producer)
+}
+
+
+type internalHelpHandler struct {
+	helpProducer *internalHelpProducer
+
+	err error
+
+	stdin  io.ReadCloser
+	stdout io.WriteCloser
+	stderr io.WriteCloser
+
+	stdinPipe  io.WriteCloser
+	stdoutPipe io.ReadCloser
+	stderrPipe io.ReadCloser
+}
+
+
+func newHelpHandler(helpProducer *internalHelpProducer) *internalHelpHandler {
+	stdin,      stdinPipe := io.Pipe()
+	stdoutPipe, stdout    := io.Pipe()
+	stderrPipe, stderr    := io.Pipe()
+
+	handler := internalHelpHandler{
+		helpProducer:helpProducer,
+
+		err:nil,
+
+		stdin:stdin,
+		stdout:stdout,
+		stderr:stderr,
+
+		stdinPipe:stdinPipe,
+		stdoutPipe:stdoutPipe,
+		stderrPipe:stderrPipe,
+	}
+
+	return &handler
+}
+
+
+
+
+func (handler *internalHelpHandler) Run() error {
+	if nil != handler.err {
+		return handler.err
+	}
+
+	//@TODO: Should this be reaching inside of ShellHandler? Maybe there should be ShellHandler public methods instead.
+	keys := make([]string, 1+len(handler.helpProducer.shellHandler.producers))
+	i:=0
+	for key,_ := range handler.helpProducer.shellHandler.producers {
+		keys[i] = key
+		i++
+	}
+	keys[i] = handler.helpProducer.shellHandler.ExitCommandName
+	sort.Strings(keys)
+	for _, key := range keys {
+		oi.LongWriteString(handler.stdout, key)
+		oi.LongWriteString(handler.stdout, "\r\n")
+	}
+
+	handler.stdin.Close()
+	handler.stdout.Close()
+	handler.stderr.Close()
+
+	return handler.err
+}
+
+func (handler *internalHelpHandler) StdinPipe() (io.WriteCloser, error) {
+	if nil != handler.err {
+		return nil, handler.err
+	}
+
+	return handler.stdinPipe, nil
+}
+
+func (handler *internalHelpHandler) StdoutPipe() (io.ReadCloser, error) {
+	if nil != handler.err {
+		return nil, handler.err
+	}
+
+	return handler.stdoutPipe, nil
+}
+
+func (handler *internalHelpHandler) StderrPipe() (io.ReadCloser, error) {
+	if nil != handler.err {
+		return nil, handler.err
+	}
+
+	return handler.stderrPipe, nil
+}