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How to detect end of input with pipes


How to detect end of input with pipes

By : Rupesh Bondili
Date : November 16 2020, 06:23 AM
seems to work fine Even more than pipes-parse you quite possibly want to take a look at pipes-group. In particular, let's examine the function
code :
-- this type is slightly specialized
chunksOf 
  :: Monad m => 
     Int -> 
     Lens' (Producer a m x) (FreeT (Producer a m) m x)
import Control.Lens (view)

chunkIt :: Monad m => Int -> Producer a m x -> FreeT (Producer a m) m x
chunkIt n = view (chunksOf n)
iterT
  :: (Functor f, Monad m) => 
     (f (m a) -> m a) -> 
     (FreeT f m a -> m a)
runChunk :: Monad m =>
            (Producer a m (m x)       -> m x) ->
            (FreeT (Producer a m) m x -> m x)
runChunk = iterT
main :: IO ()
main = flip runChunk (chunkIt 3 input) $ \p -> _
input :: Monad m => Producer Char m ()
input = each "abcdefghijklmnopqrstuvwxyz"

main :: IO ()
main = flip runChunk (chunkIt 3 input) $ \p -> do
  cont <- runEffect $ for p (lift . putChar)
  putChar '\n'
  cont
λ> main
abc
def
ghi
jkl
mno
pqr
stu
vwx
yz
input :: Monad m => Producer Char m ()
input = each "abcdefghijklmnopqrstuvwxyz"

main :: IO ()
main = flip iterT (input ^. chunksOf 3) $ \p -> do
  cont <- runEffect $ for p $ \c -> do
    lift (putChar c)
  putChar '\n'
  cont


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pipes and forks issue - some input in pipes isn't cleared properly

pipes and forks issue - some input in pipes isn't cleared properly


By : Phina Musekiwa
Date : March 29 2020, 07:55 AM
I wish did fix the issue. In the child you're not using the return value from the call to read (number of bytes read), and also in the parent you're not sending the nul char that ends a string. So in the child you're reusing part of the buffer last read when you send a string shorter than the last one.
You may try sending the nul char in the parent:
code :
write(fd[1], "login ", 6);
write(fd[1], vect[1], strlen(vect[1]) +1);
Why is my input delayed when sent to process via pipes?

Why is my input delayed when sent to process via pipes?


By : user6841109
Date : March 29 2020, 07:55 AM
With these it helps Minimodem will write 0.5 seconds of silence when it detects that there isn't enough input data to keep the audio buffer full. This is an attempt to make sure that whatever audio it does write comes out continuously. It is typically the case with audio drivers or servers (like pulseaudio) that audio is only written in chunks. When you write less than a full chunk of data to the audio buffer, the card produces no sound, since the driver or the server is waiting for enough audio data so that it can write a full chunk at once. Since the data that minimodem writes is generally not going to match full chunks of audio, you have a situation where the last part of the audio data won't get written. To avoid this problem, minimodem writes enough silence to guarantee that the last part of the audio gets output to the card.
For example, let's say the audio driver or server writes in 1000 byte chunks. Now let's say that you type one character, and that produces 2500 bytes of audio data. The audio driver or server will cause 2000 bytes of data to be played and 500 bytes will be left in the buffer. Since a modem protocol requires continuous audio, it doesn't make any sense to just leave those 500 bytes of audio data in the buffer. The receiver wouldn't see a complete character. The receiver would then have to assume tha audio was garbled and discard the character.
In Angular2 how do you detect that a filter/pipes returned no results

In Angular2 how do you detect that a filter/pipes returned no results


By : Mitesh Jaiswal
Date : March 29 2020, 07:55 AM
This might help you I want to show a message when the filter returns an empty array e.g. "No results found"
code :
<li class="col-xs-12" *ngFor="let item of jobs | jobsFilter: [originalJobList, region, county, type]"></li>

<p *ngIf="!(jobs | jobsFilter: [originalJobList, region, county, type]?.length)">No results found</p>
Need input on angular pipes

Need input on angular pipes


By : Mr.Nobody
Date : March 29 2020, 07:55 AM
Any of those help One way to do it configure your Pipe to accept length of chars as input, and you decide in your template whether you want to trim the text to lesser length or pass the size of 'name' if you want to retain full text.
code :
@Pipe({name: 'formatString'})
export class FormatString implements PipeTransform {
 transform(text: string, trimTo: number): string {
     const ellipsis = '...';
     if (trimTo && text.length > trimTo) {
         return text.substring(0, trimTo) + ellipsis;
     } else {
         return text;
     }
  }
}    
<div class="text-nowrap ellipsis" 
         (click)="nameDiv.displayFullText = !nameDiv.displayFullText" #nameDiv>

  {{name | formatString:(nameDiv.displayFullText ? name.length : 5) }}  

</div>
<h1 ellipsisText [displayText]="name" [maxCharsToDisplay]='4'>
</h1>
@Directive({
  selector: '[ellipsisText]',
})
export class EllipsisTextDirective implements OnInit {

    @Input()
    displayText: string = "";

    @Input()
    maxCharsToDisplay: number;

    showFullText = false;
    ellipsis = '...';

    constructor(private elr:ElementRef){
    }

    // Display initial text in trimmed form
    ngOnInit() {
       this.elr.nativeElement.innerHTML = this.displayText;
       this.trimText();
    }

    // On click - toggle between full text display and trimmed text display
    @HostListener('click') onClick() {
      this.showFullText = !this.showFullText;

      if (this.showFullText) {
        this.fullText();
      } else {
        this.trimText();
      }
    }

    fullText() {
        this.elr.nativeElement.innerHTML = this.displayText;
    }
    trimText() {
      if (this.displayText.length > this.maxCharsToDisplay) {
        this.elr.nativeElement.innerHTML = 
             this.displayText.substring(0, this.maxCharsToDisplay) + this.ellipsis;
      }
    }
}
C# Named Pipes, how to detect a client disconnecting

C# Named Pipes, how to detect a client disconnecting


By : user4667522
Date : March 29 2020, 07:55 AM
seems to work fine Set a read timeout and poll the NamedPipeClientStream.IsConnected flag when a timeout occurs.
A Read Timeout will cause reads that are idle for the timeout duration to throw InvalidOperationException
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