doc: Clarify guix shell's DWIM behaviour.
* doc/guix.texi ("Invoking guix shell"): Document the exact behaviour, that is which flags go together with which file names.
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@ -5670,17 +5670,22 @@ before @command{guix shell} was invoked. The next garbage collection
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(@pxref{Invoking guix gc}) may clean up packages that were installed in
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the environment and that are no longer used outside of it.
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As an added convenience, when running from a directory that contains a
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@file{manifest.scm} or a @file{guix.scm} file (in this order), possibly
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in a parent directory, @command{guix shell} automatically loads the
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file---provided the directory is listed in
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@file{~/.config/guix/shell-authorized-directories}, and only for
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interactive use:
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As an added convenience, @command{guix shell} will try to do what you
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mean when it is invoked interactively without any other arguments
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as in:
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@example
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guix shell
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@end example
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If it finds a @file{manifest.scm} in the current working directory or
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any of its parents, it uses this manifest as though it was given via @code{--manifest}.
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Likewise, if it finds a @file{guix.scm} in the same directories, it uses
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it to build a development profile as though both @code{--development}
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and @code{--file} were present.
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In either case, the file will only be loaded if the directory it
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resides in is listed in
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@file{~/.config/guix/shell-authorized-directories}.
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This provides an easy way to define, share, and enter development
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environments.
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