[jackalope]

"Get a decent editor and don't leave whitespace at the end of lines."

Trailing whitespace always raises a huge red flag for me whenever I look at someone's code. It's not just sloppy, it often makes diff output so noisy you can't detect real changes to the code.

[Perseids]

I understand that it would be bad to introduce whitespace-only changes, but why would whitespace at the end of the line that doesn't break the 80 character limit be a problem otherwise? Sure, git colors them red in its diffs, but that is kind of a circular reasoning.

E.g. in this diff

  0a1
  > k=2 
  2c3,4
  <     print(i)
  ---
  >     k*=k 
  >     print(k)

you don't even see the spaces after "k=2" and "k*=k".

[teacup50]

Who cares? Get a decent editor that doesn't give a crap if there's invisible whitespace at the end of a line.

[edran]

As the top commenter said, the problems do not end with choosing a good editor and fixing its display methodology. Git and many other VCSs create noisy diffs whenever space is added and forgotten, which ultimately complicates the life of developers that want to review changes. Even if your editor were able to make display diffs in a clean way, you would still have a dirty history when for instance using less/more or other tools (not to mention the merging issues problem).

[pshc]

Right, but that's only half of the robustness principle.

[uniformlyrandom]

or run perl -e s/(.*)\s+$/$1/g