[Haskell-cafe] Which tab width do you prefer for Haskell code?
cma at bitemyapp.com
Tue Aug 30 05:35:32 UTC 2016
When most Haskellers say tab width, they're colloquially referring to
how many literal spaces each "indent" action should be.
That is the case here as well. Most Haskellers I know do not use tabs
at all to avoid indent issues, unlike Golang which is exclusively
On Mon, Aug 29, 2016 at 10:56 PM, Richard A. O'Keefe <ok at cs.otago.ac.nz> wrote:
> On 30/08/16 6:09 AM, Christopher Done wrote:
>> Hi everyone,
>> I'm trying to get a feel for the modern Haskell community's opinion on
>> default tab-width for HIndent. Here is a link to the online poll:
>>> For the HIndent tool we'd like to choose the standard tab width.
>>> For now, it is 4, the width set by the Johan Tibell style guide.
>>> A survey of 1000 top-downloaded packages on Hackage reveals about 50-50
>>> HIndent is meant as a "community standard" tool; it should reflect the
>>> community's actual practice. If there's a clear preference for 2, we'll
>>> switch to that. Otherwise, we remain with 4.
> There seems to be some confusion here.
> The Johan Tibell style guide does NOT "set"
> "the standard tab width" to 4. Far from it!
> The guide says plainly "TABS ARE ILLEGAL".
> What the style guide talks about is INDENTATION steps.
> Not tab width!
> When it comes to TAB width, the Haskell 2010 report
> is explicit and unambiguous, leaving no room for
> anyone's preferences. Chapter 10 says
> The "indentation" of a lexeme is the column number
> of the first character of that lexeme;
> the indentation of a line is the indentation of
> its leftmost lexeme.
> To determine the column number, assume a fixed-
> width font with the following conventions:
> * The characters newline, return, linefeed,
> and formfeed, all start a new line.
> * The first column is designated column 1, not 0.
> * TAB STOPS ARE 8 CHARACTERS APART.
> * A tab character causes the insertion of enough
> spaces to align the current position with the
> next tab stop.
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