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Showing content from https://github.com/rust-lang/rust/issues/118117 below:

Tracking Issue for `FormattingOptions` · Issue #118117 · rust-lang/rust · GitHub

Feature gate: #![feature(formatting_options)]

This is a tracking issue for fmt::FormattingOptions.

FormattingOptions can be used to construct custom Formatters at runtime.

#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub struct FormattingOptions { … }

enum Sign {
    Plus, 
    Minus
}

impl FormattingOptions {
    pub fn new() -> Self;

    pub fn sign(&mut self, sign: Option<Sign>) -> &mut Self;
    pub fn zero_pad(&mut self, zero_pad: bool) -> &mut Self;
    pub fn alternate(&mut self, alternate: bool) -> &mut Self;
    pub fn fill(&mut self, fill: Option<char>) -> &mut Self;
    pub fn alignment(&mut self, alignment: Option<Alignment>) -> &mut Self;
    pub fn width(&mut self, width: Option<usize>) -> &mut Self;
    pub fn precision(&mut self, precision: Option<usize>) -> &mut Self;

    pub fn get_sign(&self) -> Option<Sign>;
    pub fn get_zero_pad(&self) -> bool;
    pub fn get_alternate(&self) -> bool;
    pub fn get_fill(&self) -> Option<char>;
    pub fn get_alignment(&self) -> Option<Alignment>;
    pub fn get_width(&self) -> Option<usize>;
    pub fn get_precision(&self) -> Option<usize>;
    
    pub fn create_formatter<'a>(self, write: &'a mut (dyn Write + 'a)) -> Formatter<'a>;
}

impl<'a> Formatter<'a> {
    pub fn new(write: &'a mut (dyn Write + 'a), options: FormattingOptions) -> Self;
    pub fn with_options(&mut self, options: FormattingOptions) -> Self;
    
    pub fn sign(&self) -> Option<Sign>;

    pub fn options(&self) -> FormattingOptions;
}

• API change proposal (ACP)¹: [ACP] Provide an interface for creating instances of fmt::Formatter libs-team#286
• Implementation: Implementation of fmt::FormattingOptions #118159
• Final comment period (FCP)²
• Stabilization PR

• Should this expose the "debug as hex" flags? ({:x?} and {:X?})
• Should we make the methods receiving parameters as &mut (especially the setters for FormattingOptions) const (which is currently unstable)? See Implementation of fmt::FormattingOptions #118159 (comment) for context

1. https://std-dev-guide.rust-lang.org/feature-lifecycle/api-change-proposals.html ↩

2. https://std-dev-guide.rust-lang.org/feature-lifecycle/stabilization.html ↩

jdahlstrom, DianaNites, cramertj, Chaoses-Ib, FeldrinH and 1 morebjoernager, cramertj, FeldrinH and bugRangerPatchMixolydic, CosminPerRam, cramertj, FeldrinH and bugRanger

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