Content after hash directive is lost

[nojaf]

Issue created from fantomas-online

Code

#if FOO
#endif // FOO

Result

#if FOO
#endif

Problem description

#else and #endif are restored in a hardcoded fashion in

fantomas/src/Fantomas.Core/Trivia.fs

Lines 259 to 270 in deffd73

	let internal collectTriviaFromDirectives
	(source: ISourceText)
	(directives: ConditionalDirectiveTrivia list)
	: Trivia list =
	directives
	|> List.map (function
	| ConditionalDirectiveTrivia.If (_, r) ->
	let text = source.GetContentAt r
	{ Item = Directive text; Range = r }
	| ConditionalDirectiveTrivia.Else r -> { Item = Directive "#else"; Range = r }
	| ConditionalDirectiveTrivia.EndIf r -> { Item = Directive "#endif"; Range = r })

The range of EndIf does appear to be spanning till the end of the line.
So text could be reused in this case to restore the code comment.
I haven't tested this, but it sure looks that way.
Calling TrimEnd() after source.GetContentAt probably makes sense as well.

A unit test can be added to https://github.com/fsprojects/fantomas/blob/master/src/Fantomas.Core.Tests/CompilerDirectivesTests.fs.

//cc @dsyme

Extra information

• The formatted result breaks my code.
• The formatted result gives compiler warnings.
• I or my company would be willing to help fix this.

Options

Fantomas master branch at 2022-06-07T15:04:36Z - deffd73

Default Fantomas configuration

_{Did you know that you can ignore files when formatting from fantomas-tool or the FAKE targets by using a .fantomasignore file?}