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-rw-r--r--HACKING24
1 files changed, 24 insertions, 0 deletions
diff --git a/HACKING b/HACKING
index bf9a45e04..0675f9c57 100644
--- a/HACKING
+++ b/HACKING
@@ -356,6 +356,30 @@ With other files, there will be some existing differences.
Try not to add any more.
+Avoid trailing white space
+==========================
+You may notice that the only trailing blanks in coreutils'
+version-controlled files are in a single directory: tests/pr,
+which contains expected output from various invocations of pr.
+
+Do not add any more trailing blanks anywhere. While "make syntax-check"
+will alert you if you slip up, it's better to nip any problem in the
+bud, as you're typing. A good way to help you adapt to this rule is
+to configure your editor to highlight any offending characters in the
+files you edit. If you use Emacs, customize its font-lock mode (FIXME:
+provide more detail) or try one of its whitespace packages. This appears
+to be the one that will end up in emacs 23:
+
+ http://www.emacswiki.org/emacs/WhiteSpace
+
+[that page says its version also works with emacs 21 and 22]
+If you use vim, add this to ~/.vimrc:
+
+ let c_space_errors=1
+ highlight RedundantSpaces ctermbg=red guibg=red
+ match RedundantSpaces /\s\+$\| \+\ze\t/
+
+
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