• vino (5/5) Aug 31 2017 Hi All,
• Stefan Koch (14/19) Aug 31 2017 ubyte[] fileData;
• Anonymouse (21/26) Aug 31 2017 Super verbose, but:
• Rene Zwanenburg (18/23) Aug 31 2017 This one doesn't read the entire file into memory:
• vino (6/31) Aug 31 2017 Hi All,

vino <vino.bheeman hotmail.com> writes:

Hi All,

   Can some provide me a example of how to remove all blank lines 
from a file.

From,
Vino.B

Stefan Koch <uplink.coder googlemail.com> writes:

On Thursday, 31 August 2017 at 14:44:07 UTC, vino wrote:
 Hi All,

   Can some provide me a example of how to remove all blank 
 lines from a file.

 From,
 Vino.B

ubyte[] fileData;
ubyte[] writeThis;
uint lastP;

fileData = readRaw(fileName);

foreach(uint p; ubyte b;fileData)
{
     if (b == '\n')
     {
         writeThis ~= fileData[lastP .. p];
         lastP = p;
     }
}

write(fileName, fileData);

Anonymouse <asdf asdf.net> writes:

On Thursday, 31 August 2017 at 14:44:07 UTC, vino wrote:
 Hi All,

   Can some provide me a example of how to remove all blank 
 lines from a file.

 From,
 Vino.B

Super verbose, but:

import std.stdio;
import std.file;
import std.algorithm.iteration;

enum inFilename = "in.txt";
enum outFilename = "out.txt";

void main()
{
     immutable lines = readText(inFilename);

     char[] outbuffer;
     outbuffer.reserve(lines.length);

     foreach (line; lines.splitter("\n"))
     {
         if (!line.length) continue;

         outbuffer ~= line;
         outbuffer ~= "\n";
     }

     auto outfile = File(outFilename, "w");
     outfile.write(outbuffer);
}

Rene Zwanenburg <renezwanenburg gmail.com> writes:

On Thursday, 31 August 2017 at 14:44:07 UTC, vino wrote:
 Hi All,

   Can some provide me a example of how to remove all blank 
 lines from a file.

 From,
 Vino.B

This one doesn't read the entire file into memory:

import std.stdio;
import std.array;
import std.algorithm;
import std.uni;

void main(string[] args)
{
	auto inputFile = File(args[1]);
	auto outputFile = File(args[2], "wb");
	
	inputFile
		.byLine
		.filter!(line => !line.all!isWhite)
		.copy(outputFile.lockingTextWriter);
}

But if you want to replace the input file, you'd have to write to 
a temp file, remove the original, then move the temp file.

vino <vino.bheeman hotmail.com> writes:

On Thursday, 31 August 2017 at 15:48:31 UTC, Rene Zwanenburg 
wrote:
 On Thursday, 31 August 2017 at 14:44:07 UTC, vino wrote:
 Hi All,

   Can some provide me a example of how to remove all blank 
 lines from a file.

 From,
 Vino.B

 This one doesn't read the entire file into memory:

 import std.stdio;
 import std.array;
 import std.algorithm;
 import std.uni;

 void main(string[] args)
 {
 	auto inputFile = File(args[1]);
 	auto outputFile = File(args[2], "wb");
 	
 	inputFile
 		.byLine
 		.filter!(line => !line.all!isWhite)
 		.copy(outputFile.lockingTextWriter);
 }

 But if you want to replace the input file, you'd have to write 
 to a temp file, remove the original, then move the temp file.

Hi All,

   Thank you very much, was able to resolve the issue.

From,
Vino.B