On Thursday, 5 June 2014 at 00:33:26 UTC, Ali Çehreli wrote:
On 06/04/2014 05:05 PM, Robert Hathaway wrote:
I've got a program that reads a text file line by line (using
std.stdio
readln())
Consider using byLine() instead. (Important: byLine uses an
internal buffer for the line; so, don't forget to make a copy
if you want to store the line for later use.)
> and I'd like to refer to the line number when I send a message
to stderr upon finding a mis-formatted line. Is there a way
to get the
current line number? Of course, I could create a counter and
increment
it with each call to readln, but is there a "cool" way of
doing this?
Okay, call me lazy... just don't call me late for dinner! :-)
Robert
One cool way is a zipped sequence:
import std.stdio;
import std.range;
void main()
{
foreach (i, line; zip(sequence!"n",
File("deneme.txt").byLine)) {
writefln("%s: %s", i, line);
}
}
Ali
Once this[1] gets merged you'll be able to do this:
foreach (lineNum, line; File("deneme.txt").byLine().enumerate(1))
writefln("%s: %s", lineNum, line);
Which is a bit more clear about the intent.
1. https://github.com/D-Programming-Language/phobos/pull/1866
