idoneal - cleaner.go

     1  package meta
     2  
     3  import (
     4  	"io"
     5  
     6  	"vimagination.zapto.org/dos2unix"
     7  )
     8  
     9  type clean struct {
    10  	r           io.Reader
    11  	lastWasChar bool
    12  }
    13  
    14  func (c *clean) Read(p []byte) (int, error) {
    15  	n, err := c.r.Read(p)
    16  	p = p[:n]
    17  	for i := 0; i < len(p); i++ {
    18  		if p[i] == '\n' {
    19  			if c.lastWasChar {
    20  				c.lastWasChar = false
    21  			} else {
    22  				p = append(p[:i], p[i+1:]...)
    23  				i--
    24  			}
    25  		} else {
    26  			c.lastWasChar = true
    27  		}
    28  	}
    29  	if err != nil {
    30  		return len(p), err
    31  	}
    32  	return len(p), nil
    33  }
    34  
    35  func cleaner(r io.Reader) io.Reader {
    36  	return &clean{
    37  		r: dos2unix.DOS2Unix(r),
    38  	}
    39  }
    40