ARGF.each_with_index do |line, idx|
print( "[#{idx}] #{line} x: " );
indent = Indent
# do stuff
indent = ""
end #ARGF e
Each line from STDIN is displayed as,
x: [1] W:\sandbox\tmp\for_each\for_each.rake
Which is not good / odd, if you开发者_如何转开发 ask me.
One further unexplained result, the line ...
print( "ab: [#{idx}] #{line} x: " );
Displays:
x: ab: [1] W:\sandbox\tmp\for_each\for_each.rake
I just get weird feelings here. Three questions, is this a:
- HOW does the "x:" string wind-up at the beginning of each 'line' the string??!
- Ruby v1.8.7 bug or my bug?
- How to fix it?
Help wanted. I keep looking at this and wonder if I what really dumb thing I did? Many thanks in advance.
aloha, Will
each_line
does not remove the newlines at the end of the lines, so the strings yielded by each_line
will contain newlines. print
on the other hand will not add newlines to the end of strings (if you want that, use puts
). So print "hello\nworld:
followed by print "lala"
, will print
hello
world:lala
which explains why your output looks the way it does.
To get the output you want, use line.chomp
instead of line
, which will remove the newline at the end of line
and thus prevent your strings from containing a line break before x:
.
A small sorry here. I fergot about end of line and CR/LF issues on Windows. The solution seems to be:
line.chomp!
print( "ab: [#{idx}] #{line}:x\n" );
Which prints the line:
ab: [1] W:\sandbox\tmp\for_each\for_each.rake x:
The remaining trap for young players, is to put your own newline(\n) after the chomp!() method. One mistake I made with this was thinking 'trim()' not 'chomp()' -- How crazy are I.
Cheers,
Will
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