Excessive line breaking about fantomas HOT 8 CLOSED

It's intentional.

Any expression containing |> is treated as a multiline expression and is broken around |> for aestheticity.

The last two examples consist of one-liner expressions.

from fantomas.

I would only drop a |> down to the next line if the line was too long, or maybe if there was more than two pipes. Does a reverse pipe get formatted the same?

from fantomas.

@7sharp9 Reverse pipe is treated as one-liner.

Since <| has relatively low precedence, you will not see their consecutive occurrences often.

from fantomas.

It does look like the line breaking is a bit excessive for some quite common uses of |>. For example:

let ``update length 3``() =
    (((len3 |> update 0 "cc"|> lookup 0) = "cc") && ((len3 |> update 1 "bb"|> lookup 1) = "bb") 
    && ((len3 |> update 2 "aa"|> lookup 2) = "aa")) |> should equal true

becomes

let ``update length 3``() = 
    (((len3
       |> update 0 "cc"
       |> lookup 0) = "cc") && ((len3
                                 |> update 1 "bb"
                                 |> lookup 1) = "bb") && ((len3
                                                           |> update 2 "aa"
                                                           |> lookup 2) = "aa"))
    |> should equal true

and

let len7 = empty |> cons "a" |> cons "b" |> cons "c" |> cons "d" |> cons "e" |> cons "f" |> cons "g"

becomes

let len7 = 
    empty
    |> cons "a"
    |> cons "b"
    |> cons "c"
    |> cons "d"
    |> cons "e"
    |> cons "f"
    |> cons "g"

from fantomas.

These line breakings are indeed excessive.

It would be nice to add a few common patterns to print |> as inline expressions. What are your suggestions?

from fantomas.

Hello, i have more general issue but with same Title.

Hi,
I would like to have an option to disable line breaking and line removing on code formatting.
In my case I need empty lines for readability purposes and disabling auto formating would
give me more freedom to control the codeset, i.e to control my record, pipe and list style
in my own way.

Thank you in advance!

from fantomas.

I need empty lines for readability purposes

The situation has improved in #434, please create a new issue with additional suggestions if necessary.

from fantomas.

Hello. I also feel that Fantomas adds too many line breaks by default. Thankfully, I'm able to control this with the Max... settings. However, I can't find a way to control the following examples:

Code:

open System open System.IO

Result:

open System
open System.IO

Code:

type JpgDir = string type TifDir = string

Result:

type JpgDir = string
type TifDir = string

Code:

module A = Array;; module L = List;;

Result:

module A = Array
module L = List

Code:

let trace x = printfn "%A" x; x

Result:

let trace x =
    printfn "%A" x
    x

Code:

let tryParseInt s = try Some (int s) with | :? FormatException -> None

Result:

let tryParseInt s =
    try
        Some(int s)
    with :? FormatException ->
        None

Code:

let boolToInt x = match x with | true -> 1 | false -> 0

let boolToInt' = function | true -> 1 | false -> 0

Result:

let boolToInt x =
    match x with
    | true -> 1
    | false -> 0

let boolToInt' =
    function
    | true -> 1
    | false -> 0

Of these examples--most of which I realize are not idiomatic F#!--the last one with the pattern match is my highest priority. If you'd like, I'll be happy to open a new issue just for the pattern match example. Thank you.

from fantomas.