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Document indent-region as a no-op #1264

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Document indent-region as a no-op #1264

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20 changes: 20 additions & 0 deletions doc/haskell-mode.texi
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Expand Up @@ -511,6 +511,26 @@ selection mode (without redefining @kbd{C-x},@kbd{C-c},@kbd{C-v}, and
@kbd{C-z}) by calling @kbd{M-x cua-selection-mode} (or adding
@code{(cua-selection-mode nil)} to your @code{haskell-mode-hook}).

@section Region indent is a no-op

There is a @code{indent-region} function that supposedly could be used
to indent code region without changing its semantics. Sadly it does not
work that way because usual use case for @code{indent-region} is:

@enumerate
@item
Alter first line of code in region.
@item
Call @code{indent-region} to fix indentation for remaining lines.
@end enumerate

Note that between 1 and 2 program is already semantically broken and
knowing how to indent it preserving semantic from before step 1 would
require time travel.

To stay on the safe side @code{indent-region-function} is bound to a
no-op in @code{haskell-mode}.

@node External indentation
@chapter Other ways to indent code

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