interpolator 0.5.0

runtime format strings, fully compatible with std's macros
Documentation 
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format_value! {lower_exp(out, value, LowerExp):
    (None, None, A::None, S::None, false, false) => write!(out, "{value:e}"),
    (None, None, A::None, S::None, false, true) => write!(out, "{value:0e}"),
    (None, None, A::None, S::Plus, false, false) => write!(out, "{value:+e}"),
    (None, None, A::None, S::Plus, false, true) => write!(out, "{value:+0e}"),
    (None, None, A::None, S::Minus, false, false) => write!(out, "{value:-e}"),
    (None, None, A::None, S::Minus, false, true) => write!(out, "{value:-0e}"),
    (None, None, A::Left, S::None, false, false) => write!(out, "{value:<e}"),
    (None, None, A::Left, S::None, false, true) => write!(out, "{value:<0e}"),
    (None, None, A::Left, S::Plus, false, false) => write!(out, "{value:<+e}"),
    (None, None, A::Left, S::Plus, false, true) => write!(out, "{value:<+0e}"),
    (None, None, A::Left, S::Minus, false, false) => write!(out, "{value:<-e}"),
    (None, None, A::Left, S::Minus, false, true) => write!(out, "{value:<-0e}"),
    (None, None, A::Center, S::None, false, false) => write!(out, "{value:^e}"),
    (None, None, A::Center, S::None, false, true) => write!(out, "{value:^0e}"),
    (None, None, A::Center, S::Plus, false, false) => write!(out, "{value:^+e}"),
    (None, None, A::Center, S::Plus, false, true) => write!(out, "{value:^+0e}"),
    (None, None, A::Center, S::Minus, false, false) => write!(out, "{value:^-e}"),
    (None, None, A::Center, S::Minus, false, true) => write!(out, "{value:^-0e}"),
    (None, None, A::Right, S::None, false, false) => write!(out, "{value:>e}"),
    (None, None, A::Right, S::None, false, true) => write!(out, "{value:>0e}"),
    (None, None, A::Right, S::Plus, false, false) => write!(out, "{value:>+e}"),
    (None, None, A::Right, S::Plus, false, true) => write!(out, "{value:>+0e}"),
    (None, None, A::Right, S::Minus, false, false) => write!(out, "{value:>-e}"),
    (None, None, A::Right, S::Minus, false, true) => write!(out, "{value:>-0e}"),
    (None, None, A::None, S::None, true, false) => write!(out, "{value:#e}"),
    (None, None, A::None, S::None, true, true) => write!(out, "{value:#0e}"),
    (None, None, A::None, S::Plus, true, false) => write!(out, "{value:+#e}"),
    (None, None, A::None, S::Plus, true, true) => write!(out, "{value:+#0e}"),
    (None, None, A::None, S::Minus, true, false) => write!(out, "{value:-#e}"),
    (None, None, A::None, S::Minus, true, true) => write!(out, "{value:-#0e}"),
    (None, None, A::Left, S::None, true, false) => write!(out, "{value:<#e}"),
    (None, None, A::Left, S::None, true, true) => write!(out, "{value:<#0e}"),
    (None, None, A::Left, S::Plus, true, false) => write!(out, "{value:<+#e}"),
    (None, None, A::Left, S::Plus, true, true) => write!(out, "{value:<+#0e}"),
    (None, None, A::Left, S::Minus, true, false) => write!(out, "{value:<-#e}"),
    (None, None, A::Left, S::Minus, true, true) => write!(out, "{value:<-#0e}"),
    (None, None, A::Center, S::None, true, false) => write!(out, "{value:^#e}"),
    (None, None, A::Center, S::None, true, true) => write!(out, "{value:^#0e}"),
    (None, None, A::Center, S::Plus, true, false) => write!(out, "{value:^+#e}"),
    (None, None, A::Center, S::Plus, true, true) => write!(out, "{value:^+#0e}"),
    (None, None, A::Center, S::Minus, true, false) => write!(out, "{value:^-#e}"),
    (None, None, A::Center, S::Minus, true, true) => write!(out, "{value:^-#0e}"),
    (None, None, A::Right, S::None, true, false) => write!(out, "{value:>#e}"),
    (None, None, A::Right, S::None, true, true) => write!(out, "{value:>#0e}"),
    (None, None, A::Right, S::Plus, true, false) => write!(out, "{value:>+#e}"),
    (None, None, A::Right, S::Plus, true, true) => write!(out, "{value:>+#0e}"),
    (None, None, A::Right, S::Minus, true, false) => write!(out, "{value:>-#e}"),
    (None, None, A::Right, S::Minus, true, true) => write!(out, "{value:>-#0e}"),
    (None, Some(pr), A::None, S::None, false, false) => write!(out, "{value:.pr$e}"),
    (None, Some(pr), A::None, S::None, false, true) => write!(out, "{value:0.pr$e}"),
    (None, Some(pr), A::None, S::Plus, false, false) => write!(out, "{value:+.pr$e}"),
    (None, Some(pr), A::None, S::Plus, false, true) => write!(out, "{value:+0.pr$e}"),
    (None, Some(pr), A::None, S::Minus, false, false) => write!(out, "{value:-.pr$e}"),
    (None, Some(pr), A::None, S::Minus, false, true) => write!(out, "{value:-0.pr$e}"),
    (None, Some(pr), A::Left, S::None, false, false) => write!(out, "{value:<.pr$e}"),
    (None, Some(pr), A::Left, S::None, false, true) => write!(out, "{value:<0.pr$e}"),
    (None, Some(pr), A::Left, S::Plus, false, false) => write!(out, "{value:<+.pr$e}"),
    (None, Some(pr), A::Left, S::Plus, false, true) => write!(out, "{value:<+0.pr$e}"),
    (None, Some(pr), A::Left, S::Minus, false, false) => write!(out, "{value:<-.pr$e}"),
    (None, Some(pr), A::Left, S::Minus, false, true) => write!(out, "{value:<-0.pr$e}"),
    (None, Some(pr), A::Center, S::None, false, false) => write!(out, "{value:^.pr$e}"),
    (None, Some(pr), A::Center, S::None, false, true) => write!(out, "{value:^0.pr$e}"),
    (None, Some(pr), A::Center, S::Plus, false, false) => write!(out, "{value:^+.pr$e}"),
    (None, Some(pr), A::Center, S::Plus, false, true) => write!(out, "{value:^+0.pr$e}"),
    (None, Some(pr), A::Center, S::Minus, false, false) => write!(out, "{value:^-.pr$e}"),
    (None, Some(pr), A::Center, S::Minus, false, true) => write!(out, "{value:^-0.pr$e}"),
    (None, Some(pr), A::Right, S::None, false, false) => write!(out, "{value:>.pr$e}"),
    (None, Some(pr), A::Right, S::None, false, true) => write!(out, "{value:>0.pr$e}"),
    (None, Some(pr), A::Right, S::Plus, false, false) => write!(out, "{value:>+.pr$e}"),
    (None, Some(pr), A::Right, S::Plus, false, true) => write!(out, "{value:>+0.pr$e}"),
    (None, Some(pr), A::Right, S::Minus, false, false) => write!(out, "{value:>-.pr$e}"),
    (None, Some(pr), A::Right, S::Minus, false, true) => write!(out, "{value:>-0.pr$e}"),
    (None, Some(pr), A::None, S::None, true, false) => write!(out, "{value:#.pr$e}"),
    (None, Some(pr), A::None, S::None, true, true) => write!(out, "{value:#0.pr$e}"),
    (None, Some(pr), A::None, S::Plus, true, false) => write!(out, "{value:+#.pr$e}"),
    (None, Some(pr), A::None, S::Plus, true, true) => write!(out, "{value:+#0.pr$e}"),
    (None, Some(pr), A::None, S::Minus, true, false) => write!(out, "{value:-#.pr$e}"),
    (None, Some(pr), A::None, S::Minus, true, true) => write!(out, "{value:-#0.pr$e}"),
    (None, Some(pr), A::Left, S::None, true, false) => write!(out, "{value:<#.pr$e}"),
    (None, Some(pr), A::Left, S::None, true, true) => write!(out, "{value:<#0.pr$e}"),
    (None, Some(pr), A::Left, S::Plus, true, false) => write!(out, "{value:<+#.pr$e}"),
    (None, Some(pr), A::Left, S::Plus, true, true) => write!(out, "{value:<+#0.pr$e}"),
    (None, Some(pr), A::Left, S::Minus, true, false) => write!(out, "{value:<-#.pr$e}"),
    (None, Some(pr), A::Left, S::Minus, true, true) => write!(out, "{value:<-#0.pr$e}"),
    (None, Some(pr), A::Center, S::None, true, false) => write!(out, "{value:^#.pr$e}"),
    (None, Some(pr), A::Center, S::None, true, true) => write!(out, "{value:^#0.pr$e}"),
    (None, Some(pr), A::Center, S::Plus, true, false) => write!(out, "{value:^+#.pr$e}"),
    (None, Some(pr), A::Center, S::Plus, true, true) => write!(out, "{value:^+#0.pr$e}"),
    (None, Some(pr), A::Center, S::Minus, true, false) => write!(out, "{value:^-#.pr$e}"),
    (None, Some(pr), A::Center, S::Minus, true, true) => write!(out, "{value:^-#0.pr$e}"),
    (None, Some(pr), A::Right, S::None, true, false) => write!(out, "{value:>#.pr$e}"),
    (None, Some(pr), A::Right, S::None, true, true) => write!(out, "{value:>#0.pr$e}"),
    (None, Some(pr), A::Right, S::Plus, true, false) => write!(out, "{value:>+#.pr$e}"),
    (None, Some(pr), A::Right, S::Plus, true, true) => write!(out, "{value:>+#0.pr$e}"),
    (None, Some(pr), A::Right, S::Minus, true, false) => write!(out, "{value:>-#.pr$e}"),
    (None, Some(pr), A::Right, S::Minus, true, true) => write!(out, "{value:>-#0.pr$e}"),
    (Some(wi), None, A::None, S::None, false, false) => write!(out, "{value:wi$e}"),
    (Some(wi), None, A::None, S::None, false, true) => write!(out, "{value:0wi$e}"),
    (Some(wi), None, A::None, S::Plus, false, false) => write!(out, "{value:+wi$e}"),
    (Some(wi), None, A::None, S::Plus, false, true) => write!(out, "{value:+0wi$e}"),
    (Some(wi), None, A::None, S::Minus, false, false) => write!(out, "{value:-wi$e}"),
    (Some(wi), None, A::None, S::Minus, false, true) => write!(out, "{value:-0wi$e}"),
    (Some(wi), None, A::Left, S::None, false, false) => write!(out, "{value:<wi$e}"),
    (Some(wi), None, A::Left, S::None, false, true) => write!(out, "{value:<0wi$e}"),
    (Some(wi), None, A::Left, S::Plus, false, false) => write!(out, "{value:<+wi$e}"),
    (Some(wi), None, A::Left, S::Plus, false, true) => write!(out, "{value:<+0wi$e}"),
    (Some(wi), None, A::Left, S::Minus, false, false) => write!(out, "{value:<-wi$e}"),
    (Some(wi), None, A::Left, S::Minus, false, true) => write!(out, "{value:<-0wi$e}"),
    (Some(wi), None, A::Center, S::None, false, false) => write!(out, "{value:^wi$e}"),
    (Some(wi), None, A::Center, S::None, false, true) => write!(out, "{value:^0wi$e}"),
    (Some(wi), None, A::Center, S::Plus, false, false) => write!(out, "{value:^+wi$e}"),
    (Some(wi), None, A::Center, S::Plus, false, true) => write!(out, "{value:^+0wi$e}"),
    (Some(wi), None, A::Center, S::Minus, false, false) => write!(out, "{value:^-wi$e}"),
    (Some(wi), None, A::Center, S::Minus, false, true) => write!(out, "{value:^-0wi$e}"),
    (Some(wi), None, A::Right, S::None, false, false) => write!(out, "{value:>wi$e}"),
    (Some(wi), None, A::Right, S::None, false, true) => write!(out, "{value:>0wi$e}"),
    (Some(wi), None, A::Right, S::Plus, false, false) => write!(out, "{value:>+wi$e}"),
    (Some(wi), None, A::Right, S::Plus, false, true) => write!(out, "{value:>+0wi$e}"),
    (Some(wi), None, A::Right, S::Minus, false, false) => write!(out, "{value:>-wi$e}"),
    (Some(wi), None, A::Right, S::Minus, false, true) => write!(out, "{value:>-0wi$e}"),
    (Some(wi), None, A::None, S::None, true, false) => write!(out, "{value:#wi$e}"),
    (Some(wi), None, A::None, S::None, true, true) => write!(out, "{value:#0wi$e}"),
    (Some(wi), None, A::None, S::Plus, true, false) => write!(out, "{value:+#wi$e}"),
    (Some(wi), None, A::None, S::Plus, true, true) => write!(out, "{value:+#0wi$e}"),
    (Some(wi), None, A::None, S::Minus, true, false) => write!(out, "{value:-#wi$e}"),
    (Some(wi), None, A::None, S::Minus, true, true) => write!(out, "{value:-#0wi$e}"),
    (Some(wi), None, A::Left, S::None, true, false) => write!(out, "{value:<#wi$e}"),
    (Some(wi), None, A::Left, S::None, true, true) => write!(out, "{value:<#0wi$e}"),
    (Some(wi), None, A::Left, S::Plus, true, false) => write!(out, "{value:<+#wi$e}"),
    (Some(wi), None, A::Left, S::Plus, true, true) => write!(out, "{value:<+#0wi$e}"),
    (Some(wi), None, A::Left, S::Minus, true, false) => write!(out, "{value:<-#wi$e}"),
    (Some(wi), None, A::Left, S::Minus, true, true) => write!(out, "{value:<-#0wi$e}"),
    (Some(wi), None, A::Center, S::None, true, false) => write!(out, "{value:^#wi$e}"),
    (Some(wi), None, A::Center, S::None, true, true) => write!(out, "{value:^#0wi$e}"),
    (Some(wi), None, A::Center, S::Plus, true, false) => write!(out, "{value:^+#wi$e}"),
    (Some(wi), None, A::Center, S::Plus, true, true) => write!(out, "{value:^+#0wi$e}"),
    (Some(wi), None, A::Center, S::Minus, true, false) => write!(out, "{value:^-#wi$e}"),
    (Some(wi), None, A::Center, S::Minus, true, true) => write!(out, "{value:^-#0wi$e}"),
    (Some(wi), None, A::Right, S::None, true, false) => write!(out, "{value:>#wi$e}"),
    (Some(wi), None, A::Right, S::None, true, true) => write!(out, "{value:>#0wi$e}"),
    (Some(wi), None, A::Right, S::Plus, true, false) => write!(out, "{value:>+#wi$e}"),
    (Some(wi), None, A::Right, S::Plus, true, true) => write!(out, "{value:>+#0wi$e}"),
    (Some(wi), None, A::Right, S::Minus, true, false) => write!(out, "{value:>-#wi$e}"),
    (Some(wi), None, A::Right, S::Minus, true, true) => write!(out, "{value:>-#0wi$e}"),
    (Some(wi), Some(pr), A::None, S::None, false, false) => write!(out, "{value:wi$.pr$e}"),
    (Some(wi), Some(pr), A::None, S::None, false, true) => write!(out, "{value:0wi$.pr$e}"),
    (Some(wi), Some(pr), A::None, S::Plus, false, false) => write!(out, "{value:+wi$.pr$e}"),
    (Some(wi), Some(pr), A::None, S::Plus, false, true) => write!(out, "{value:+0wi$.pr$e}"),
    (Some(wi), Some(pr), A::None, S::Minus, false, false) => write!(out, "{value:-wi$.pr$e}"),
    (Some(wi), Some(pr), A::None, S::Minus, false, true) => write!(out, "{value:-0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Left, S::None, false, false) => write!(out, "{value:<wi$.pr$e}"),
    (Some(wi), Some(pr), A::Left, S::None, false, true) => write!(out, "{value:<0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Left, S::Plus, false, false) => write!(out, "{value:<+wi$.pr$e}"),
    (Some(wi), Some(pr), A::Left, S::Plus, false, true) => write!(out, "{value:<+0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Left, S::Minus, false, false) => write!(out, "{value:<-wi$.pr$e}"),
    (Some(wi), Some(pr), A::Left, S::Minus, false, true) => write!(out, "{value:<-0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Center, S::None, false, false) => write!(out, "{value:^wi$.pr$e}"),
    (Some(wi), Some(pr), A::Center, S::None, false, true) => write!(out, "{value:^0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Center, S::Plus, false, false) => write!(out, "{value:^+wi$.pr$e}"),
    (Some(wi), Some(pr), A::Center, S::Plus, false, true) => write!(out, "{value:^+0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Center, S::Minus, false, false) => write!(out, "{value:^-wi$.pr$e}"),
    (Some(wi), Some(pr), A::Center, S::Minus, false, true) => write!(out, "{value:^-0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Right, S::None, false, false) => write!(out, "{value:>wi$.pr$e}"),
    (Some(wi), Some(pr), A::Right, S::None, false, true) => write!(out, "{value:>0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Right, S::Plus, false, false) => write!(out, "{value:>+wi$.pr$e}"),
    (Some(wi), Some(pr), A::Right, S::Plus, false, true) => write!(out, "{value:>+0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Right, S::Minus, false, false) => write!(out, "{value:>-wi$.pr$e}"),
    (Some(wi), Some(pr), A::Right, S::Minus, false, true) => write!(out, "{value:>-0wi$.pr$e}"),
    (Some(wi), Some(pr), A::None, S::None, true, false) => write!(out, "{value:#wi$.pr$e}"),
    (Some(wi), Some(pr), A::None, S::None, true, true) => write!(out, "{value:#0wi$.pr$e}"),
    (Some(wi), Some(pr), A::None, S::Plus, true, false) => write!(out, "{value:+#wi$.pr$e}"),
    (Some(wi), Some(pr), A::None, S::Plus, true, true) => write!(out, "{value:+#0wi$.pr$e}"),
    (Some(wi), Some(pr), A::None, S::Minus, true, false) => write!(out, "{value:-#wi$.pr$e}"),
    (Some(wi), Some(pr), A::None, S::Minus, true, true) => write!(out, "{value:-#0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Left, S::None, true, false) => write!(out, "{value:<#wi$.pr$e}"),
    (Some(wi), Some(pr), A::Left, S::None, true, true) => write!(out, "{value:<#0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Left, S::Plus, true, false) => write!(out, "{value:<+#wi$.pr$e}"),
    (Some(wi), Some(pr), A::Left, S::Plus, true, true) => write!(out, "{value:<+#0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Left, S::Minus, true, false) => write!(out, "{value:<-#wi$.pr$e}"),
    (Some(wi), Some(pr), A::Left, S::Minus, true, true) => write!(out, "{value:<-#0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Center, S::None, true, false) => write!(out, "{value:^#wi$.pr$e}"),
    (Some(wi), Some(pr), A::Center, S::None, true, true) => write!(out, "{value:^#0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Center, S::Plus, true, false) => write!(out, "{value:^+#wi$.pr$e}"),
    (Some(wi), Some(pr), A::Center, S::Plus, true, true) => write!(out, "{value:^+#0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Center, S::Minus, true, false) => write!(out, "{value:^-#wi$.pr$e}"),
    (Some(wi), Some(pr), A::Center, S::Minus, true, true) => write!(out, "{value:^-#0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Right, S::None, true, false) => write!(out, "{value:>#wi$.pr$e}"),
    (Some(wi), Some(pr), A::Right, S::None, true, true) => write!(out, "{value:>#0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Right, S::Plus, true, false) => write!(out, "{value:>+#wi$.pr$e}"),
    (Some(wi), Some(pr), A::Right, S::Plus, true, true) => write!(out, "{value:>+#0wi$.pr$e}"),
    (Some(wi), Some(pr), A::Right, S::Minus, true, false) => write!(out, "{value:>-#wi$.pr$e}"),
    (Some(wi), Some(pr), A::Right, S::Minus, true, true) => write!(out, "{value:>-#0wi$.pr$e}"),
}