gnu: python-invoke: Refresh style.

* gnu/packages/python-xyz.scm (python-invoke): Use G-expressions, fix
order of fields.
[description]: Fix fill paragraph indentation.

Change-Id: I493bfe2a7308d51c9ef00083f88742e330ad79de

gnu/packages/python-xyz.scm

@@ -26171,31 +26171,32 @@ manipulation and interaction with formal grammars.")
 (define-public python-invoke
   (package
     (name "python-invoke")
-    (home-page "https://www.pyinvoke.org/")
     (version "1.6.0")
-    (source (origin
+    (source
+     (origin
        (method url-fetch)
        (uri (pypi-uri "invoke" version))
        (sha256
-               (base32
-                "1lsql9daabfr31c7syva5myc5bka45k57ygs9fliv63qrwp1wk9p"))))
+        (base32 "1lsql9daabfr31c7syva5myc5bka45k57ygs9fliv63qrwp1wk9p"))))
     (build-system python-build-system)
     (arguments
+     (list
      ;; XXX: Requires many dependencies that are not yet in Guix.
-     `(#:tests? #f
+      #:tests? #f
       #:phases
-       (modify-phases %standard-phases
+      #~(modify-phases %standard-phases
           (add-after 'unpack 'delete-python2-code
             (lambda _
               (delete-file-recursively "invoke/vendor/yaml2")))
           (add-after 'unpack 'fix-bash-path
-           (lambda* (#:key inputs #:allow-other-keys)
-             (let ((bash (assoc-ref inputs "bash")))
+            (lambda _
+              (let ((bash #$(this-package-input "bash-minimal")))
                 (substitute* "invoke/config.py"
                   (("shell = \"/bin/bash\"")
                    (string-append "shell = \"" bash "/bin/bash\"")))))))))
     (inputs
-     `(("bash" ,bash-minimal)))
+     (list bash-minimal))
+    (home-page "https://www.pyinvoke.org/")
     (synopsis "Pythonic task execution")
     (description
      "Invoke is a Python task execution tool and library, drawing inspiration