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~! in format will force-output #999

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Oct 9, 2023
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~! in format will force-output #999

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2 changes: 1 addition & 1 deletion doc/reference/std/format.md
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Expand Up @@ -16,7 +16,6 @@ in [SRFI 48](https://srfi.schemers.org/srfi-48/srfi-48.html).
-> string
```


Formats the arguments to a string using the supplied format specifier.

::: warning Differences with SRFI 48
Expand All @@ -25,6 +24,7 @@ Formats the arguments to a string using the supplied format specifier.
- ~f/~F means "float" and does non-exp fp (C-style %f more or less)
- ~r/~R means "repr" and works with `:std/misc/repr` and the `:pr` method
- ~w{spec} does generic fixed width
- ~! does force-output (inspired by OCaml)
- not implemented: ~& ~H wtfs
:::

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4 changes: 4 additions & 0 deletions src/std/format.ss
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Expand Up @@ -37,6 +37,7 @@
;; ~f/~F means "float" and does non-exp fp (C-style %f more or less)
;; ~r/~R means "repr" and works with `:std/misc/repr` and the `:pr` method
;; ~w{spec} does generic fixed width
;; ~! does force-output (inspired by OCaml)
;; not implemented: ~& ~H wtfs
;; TODO: ~g/~e for C-style %g/%e

Expand Down Expand Up @@ -161,6 +162,9 @@
(defdispatch-q (#\_)
(write-char #\space))

(defdispatch-q (#\!)
(force-output))
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;; recursive format
(defdispatch (#\? #\k #\K)
(lambda (_ K xi rest)
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