gnu: python-exceptiongroup: Move to python-build.

* gnu/packages/python-xyz.scm (python-exceptiongroup): Move from here ...
* gnu/packages/python-build.scm: ... to here.

Change-Id: Id034df5a988c5f6a4448879ba44ee1315888f63b

1 files changed, 44 insertions, 0 deletions

diff --git a/gnu/packages/python-build.scm b/gnu/packages/python-build.scm
index 9077eb854a..62fa7a65e9 100644
--- a/gnu/packages/python-build.scm
+++ b/gnu/packages/python-build.scm
@@ -729,6 +729,50 @@ installed, will expose packages in a local directory on @code{sys.path} in
 reflected in the package visible to Python, without needing a reinstall.")
     (license license:expat)))
 
+;; This package may be removed when we have Python 3.11 on board.
+(define-public python-exceptiongroup
+  (package
+    (name "python-exceptiongroup")
+    (version "1.1.1")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/agronholm/exceptiongroup")
+                    (commit version)))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "0wcvzwgjs0xmggs6dh92jxdqi988gafzh10hrzvw10kasy0xakfj"))))
+    (build-system python-build-system)
+    (arguments
+     (list
+      #:tests? #f                       ;TODO: Circular dependency on pytest
+      #:phases
+      #~(modify-phases %standard-phases
+          ;; XXX: PEP 517 manual build/install procedures copied from
+          ;; python-isort.
+          (replace 'build
+            (lambda _
+              (setenv "SETUPTOOLS_SCM_PRETEND_VERSION" #$version)
+              ;; ZIP does not support timestamps before 1980.
+              (setenv "SOURCE_DATE_EPOCH" "315532800")
+              (invoke "python" "-m" "build" "--wheel" "--no-isolation" ".")))
+          (replace 'install
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let ((whl (car (find-files "dist" "\\.whl$"))))
+                (invoke "pip" "--no-cache-dir" "--no-input"
+                        "install" "--no-deps" "--prefix" #$output whl))))
+          (replace 'check
+            (lambda* (#:key tests? #:allow-other-keys)
+              (when tests?
+                (invoke "pytest" "-vv" "tests")))))))
+    (native-inputs (list python-flit-scm python-pypa-build))
+    (home-page "https://github.com/agronholm/exceptiongroup")
+    (synopsis "PEP 654 backport from Python 3.11")
+    (description "This is a backport of the @code{BaseExceptionGroup} and
+@code{ExceptionGroup} classes from Python 3.11.")
+    (license license:expat)))
+
 (define-public python-hatchling
   (package
     (name "python-hatchling")