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Diffstat (limited to 'doc/guix.texi')
| -rw-r--r-- | doc/guix.texi | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index a4ffa8524b..92eccad118 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -1937,6 +1937,33 @@ effect, one must use @code{run-with-store}: @result{} /gnu/store/...-profile.sh @end example +Note that the @code{(guix monad-repl)} module extends Guile's REPL with +new ``meta-commands'' to make it easier to deal with monadic procedures: +@code{run-in-store}, and @code{enter-store-monad}. The former, is used +to ``run'' a single monadic value through the store: + +@example +scheme@@(guile-user)> ,run-in-store (package->derivation hello) +$1 = #<derivation /gnu/store/@dots{}-hello-2.9.drv => @dots{}> +@end example + +The latter enters a recursive REPL, where all the return values are +automatically run through the store: + +@example +scheme@@(guile-user)> ,enter-store-monad +store-monad@@(guile-user) [1]> (package->derivation hello) +$2 = #<derivation /gnu/store/@dots{}-hello-2.9.drv => @dots{}> +store-monad@@(guile-user) [1]> (text-file "foo" "Hello!") +$3 = "/gnu/store/@dots{}-foo" +store-monad@@(guile-user) [1]> ,q +scheme@@(guile-user)> +@end example + +@noindent +Note that non-monadic values cannot be returned in the +@code{store-monad} REPL. + The main syntactic forms to deal with monads in general are described below. |