I only had stated that bufio.Scan() doesn't return io.EOF as the doc stats
that it Err returns nil. Which is fine but hard to check for. But from what
I've seen the functionality that im looking for would need to check for the
SIG.KILL/EOF on input. Now whether or not i shoudlgo and alter the
bufio.Scanner to return io.EOF as an Err is a different thing. But that
would be a smidge excessive for just 1 minor functionality.
On Tuesday, 4 September 2018 09:53:43 UTC-4, peterGo wrote:
>
> Hunter,
>
> Your main.go file is 171 lines of dense code. If you reduced your issue to
> a small, working piece of code, people would be more likely help you.
>
> You say "bufio.Scan() doesn't return io.EOF." Why?
>
> $ go doc bufio.scanner
> type Scanner struct {
> }
>
> Scanning stops unrecoverably at EOF, the first I/O error, or a token
> too
> large to fit in the buffer.
>
> $ go doc bufio.scanner.scan
> func (s *Scanner) Scan() bool
>
> Scan advances the Scanner to the next token, which will then be
> available
> through the Bytes or Text method. It returns false when the scan stops,
> either by reaching the end of the input or an error. After Scan returns
> false, the Err method will return any error that occurred during
> scanning,
> except that if it was io.EOF, Err will return nil.
>
> For example,
>
> package main
>
> import (
> "bufio"
> "fmt"
> "io"
> "os"
> )
>
> func main() {
> var input = bufio.NewScanner(os.Stdin)
> for input.Scan() {
> text := input.Text()
> fmt.Println(len(text), text)
> }
> if err := input.Err(); err != nil {
> fmt.Fprintln(os.Stderr, err)
> return
> }
> // input.Scan() == false && input.Err() == nil
> fmt.Println(io.EOF)
> }
>
> Output:
>
> # On Linux, Ctrl-D for eof
>
> $ go run eof.go
> asd
> 3 asd
> EOF
> $
>
> Peter
>
> On Monday, September 3, 2018 at 12:49:12 PM UTC-4, Hunter Breathat wrote:
>>
>> Hey, so I'm currently trying to create a custom shell.
>>
>> I am currently trying to implement the EOF exit (^D). Currently, I am
>> able to use exit as input and a variety of other
>> commands, platform-specific; anything, not windows related (WIP), but I
>> am having an issue with the EOF causing
>> an infinite loop. If you could help that would be splendid.
>>
>> bufio.Scan() doesn't return io.EOF (So that's a bust even though that's
>> the current implementation)
>>
>> GoShell Repo <https://github.com/NexisHunter/GoShell>
>>
>> The section you are looking for is in the file: main.go.
>>
>> Thanks in advanced
>> Hunter
>>
>> PS.
>> If you are able to even possible walk me through it would help a bit.
>>
>
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