Write to bufio Scanner from outside os.Stdin

[Mark Bauermeister]

I'm in the process of writing a text adventure parser.
By default, the parser simply uses Stdin.

i e 

for {

        fmt.Print(">>> ")

        reader := bufio.NewScanner(os.Stdin)

        for reader.Scan() {

            switch reader.Text() {

...

...

This is quite convenient. However, I now want to be able to pass in text from outside this for-loop. Say I have a function "Invoke(arg string)" which I should be able to call to pass

arguments straight to the Scanner interface.

What would be the most straightforward way to achieve this?

[roger peppe]

https://golang.org/pkg/strings/#NewReader should do what you require.

 

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[Mark Bauermeister]

Thanks!

I've changed the code to this:

var console *bufio.ReadWriter

var cmd string

func (g *Game) Parse() {

    // reader should be wrapped inside an _input() function.

            for {

        console = bufio.NewReadWriter(

            bufio.NewReader(os.Stdin),

            bufio.NewWriter(os.Stdout))

        fmt.Print(">>> ")

        cmd, _ = console.ReadString('\n')

        switch cmd {

...

...

Now my thinking is that I should be able to simply assign "cmd" from anywhere outside the loop
followed by a newline character (i e "cmd = "Test \n") and the reader should pick it up as if it was a manual input.

Unfortunately, that doesn't quite seem to work yet.