guix style command helps packagers style their package
definitions according to the latest fashionable trends. The command
currently provides the following styling rules:
The way package inputs are written is going through a transition (see 软件包引用, for more on package inputs). Until version 1.3.0, package inputs were written using the “old style”, where each input was given an explicit label, most of the time the package name:
(package ;; … ;; The "old style" (deprecated). (inputs `(("libunistring" ,libunistring) ("libffi" ,libffi))))
Today, the old style is deprecated and the preferred style looks like this:
(package ;; … ;; The "new style". (inputs (list libunistring libffi)))
Likewise, uses of
alist-delete and friends to manipulate inputs is
now deprecated in favor of
modify-inputs (see Defining Package Variants, for more info on
In the vast majority of cases, this is a purely mechanical change on the
surface syntax that does not even incur a package rebuild. Running
guix style -S inputs can do that for you, whether you’re working
on packages in Guix proper or in an external channel.
The general syntax is:
guix style [options] package…
guix style to analyze and rewrite the definition of
package… or, when package is omitted, of all the
packages. The --styling or -S option allows you to select
the style rule, the default rule being
The available options are listed below.
Show source file locations that would be edited but do not modify them.
Apply rule, one of the following styling rules:
Format the given package definition(s)—this is the default styling rule. For example, a packager running Guix on a checkout (see 在安装之前运行Guix) might want to reformat the definition of the Coreutils package like so:
./pre-inst-env guix style coreutils
Rewrite package inputs to the “new style”, as described above. This is
how you would rewrite inputs of package
whatnot in your own channel:
guix style -L ~/my/channel -S inputs whatnot
Rewriting is done in a conservative way: preserving comments and bailing out if it cannot make sense of the code that appears in an inputs field. The --input-simplification option described below provides fine-grain control over when inputs should be simplified.
Add directory to the front of the package module search path (see 软件包模块).
Style the package expr evaluates to.
For example, running:
guix style -e '(@ (gnu packages gcc) gcc-5)'
gcc-5 package definition.
When using the
inputs styling rule, with ‘-S inputs’, this
option specifies the package input simplification policy for cases where an
input label does not match the corresponding package name. policy may
be one of the following:
Simplify inputs only when the change is “silent”, meaning that the package does not need to be rebuilt (its derivation is unchanged).
Simplify inputs only when that is “safe” to do: the package might need to be rebuilt, but the change is known to have no observable effect.
Simplify inputs even when input labels do not match package names, and even if that might have an observable effect.
The default is
silent, meaning that input simplifications do not
trigger any package rebuild.