Allow single-line `if` expressions #648

rlefevre · 2019-11-16T20:49:31Z

Resolves #209

rlefevre · 2019-11-16T21:13:52Z

Note: I have not found a more optimized solution than the 3 trackNewline but I may have overlooked it.

tests/test-files/transform/Elm-0.18/Examples.formatted.elm

avh4

Thanks for taking this on!

This will need more tests. Specifically an example of all the different single/multiline combinations should be added to tests/test-files/good/Elm-0.19/AllSyntax/Expressions.elm (probably in or immediately after ifStatement (line 273)).

parser/src/Parse/Expression.hs

tests/test-files/transform/Elm-0.18/Examples.formatted.elm

rlefevre · 2019-11-17T18:49:03Z

I totally agree this needs more tests, but I need some guidance because I don't understand if tests in ExpressionTest.hs should use example that seem to only test parsing, example' that compares to the formatted string, or tests like tests/test-files/transform/Elm-0.18/Examples.formatted.elm that compare a full file. I'm a little confused.

avh4 · 2019-11-17T18:54:38Z

Ah, ExpressionTest.hs is meant to be phased out (as you've probably noticed, it's a pain to update). The tests/test-files/good is the main test suite, and every new feature should have tests there (for this change, I think Elm-0.19/AllSyntax/Expressions.elm makes sense. Then tests/test-files/transform is for things that require the input file to be different from the output file.

So for this PR:

add examples of the new allowed formats in tests/test-files/good/Elm-0.19/AllSyntax/Expressions.elm
update ExpressionTest.hs as little as possible so that it compiles and passes
If there's a tests/test-files/transform you want to add, you can, but it's not required

tests/test-files/good/Elm-0.19/AllSyntax/Expressions.elm

tests/test-files/transform/Elm-0.18/Examples.formatted.elm

src/ElmFormat/Render/Box.hs

tests added

rlefevre · 2019-11-22T23:20:27Z

I think that the PR is now complete, including tests.
I will just rebase it once the upgrade-tool branch is merged.

avh4 · 2019-11-24T18:22:40Z

tests/test-files/transform/Elm-0.19/IfElseIfAlwaysMultiLine.elm

@@ -0,0 +1 @@
+x = if True then 1 else if False then 2 else 3


avh4 · 2019-11-24T18:25:17Z

src/ElmFormat/Render/Box.hs

+                ]
+
+        (_, ifCond, thenBody, _, elseBody) ->
+            formatIfExpressionMultiline elmVersion importInfo ifCond thenBody elseifs elseBody


The way these two functions work together seems a bit complicated. The ideal is that these functions basically have two phases: 1) turning all the stuff into boxes and 2) assembling the boxes based on the multiline features. Here we turn just enough into boxes to decide if we should call the other function, which makes it a bit harder to follow the full logic.

Though looking at the code for a few minutes, I don't have any quick suggestions of how to refactor this, so if you don't have time to give a try to simplifying this more, that's fine. (A lot of the existing code in here is way more confusing than this)

I think it should be easier to follow the logic now.

avh4 · 2019-11-24T18:26:45Z

Looks great, thanks! I'll let you know when I get upgrade-tool merged (goal is the next two weeks).

And also I think this will start the 0.9 releases as a notable behavior change.

rlefevre · 2019-11-25T14:17:11Z

src/ElmFormat/Render/Box.hs

+        Left box -> box
+
+
+boxesOrLinesToBox :: Bool -> Either [Box] [Line] -> Box


Maybe we could put this function and boxOrLineToBox into Box.hs?
I'm not sure because of the use of ElmStructure.forceableSpaceSepOrStack1.

Resolves avh4#209

andys8 · 2019-11-29T13:54:51Z

@rlefevre (and @avh4) Thanks so much for tackling this issue. It is really "improving the language" for me :)

ChristophP · 2020-09-24T18:44:59Z

Really looking forward to this feature. I feel like this would clean up a bunch of code the previously required lots of space

rlefevre mentioned this pull request Nov 16, 2019

Single/Multi-line formatting trigger discussion #647

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Should single-line if expressions be allowed? #209

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rlefevre changed the title ~~Add support for single-line if expressions~~ Allow single-line if expressions Nov 17, 2019

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Remaining differences with elm/core #650

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tests/test-files/transform/Elm-0.19/IfElseIfAlwaysMultiLine.elm

@@ -0,0 +1 @@

x = if True then 1 else if False then 2 else 3

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Allow single-line if expressions

657c586

Resolves avh4#209

Add consecutive comments tests for if expressions

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avh4 self-assigned this Apr 27, 2020

avh4 changed the base branch from master to main September 18, 2020 02:54

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Allow single-line `if` expressions #648

Allow single-line `if` expressions #648

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andys8 commented Nov 29, 2019

ChristophP commented Sep 24, 2020

		Left box -> box


		boxesOrLinesToBox :: Bool -> Either [Box] [Line] -> Box

Allow single-line if expressions #648

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Allow single-line if expressions #648

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ChristophP commented Sep 24, 2020

Allow single-line `if` expressions #648

Allow single-line `if` expressions #648

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