Add a new user option in Python mode to improve the indentation

* lisp/progmodes/python.el (python-indent-block-paren-deeper): New
user option.
(python-indent-context): Add a new context :inside-paren-from-block.
(python-indent--calculate-indentation): Modify according to
`python-indent-block-paren-deeper' and :inside-paren-from-block.
* test/lisp/progmodes/python-tests.el
(python-indent-inside-paren-block-1)
(python-indent-inside-paren-block-2)
(python-indent-inside-paren-block-3)
(python-indent-inside-paren-block-4): New tests.
(python-indent-inside-paren-5, python-indent-dedenters-8): Modify
according to the new context.
* etc/NEWS: Document the new user option.  (Bug#62696)

1 files changed, 114 insertions, 2 deletions

diff --git a/test/lisp/progmodes/python-tests.el b/test/lisp/progmodes/python-tests.el
index 50153e66da5..60b11d572cf 100644
--- a/test/lisp/progmodes/python-tests.el
+++ b/test/lisp/progmodes/python-tests.el
@@ -1139,7 +1139,7 @@ while ((not some_condition) and
    (should (eq (car (python-indent-context)) :no-indent))
    (should (= (python-indent-calculate-indentation) 0))
    (forward-line 1)
-   (should (eq (car (python-indent-context)) :inside-paren))
+   (should (eq (car (python-indent-context)) :inside-paren-from-block))
    (should (= (python-indent-calculate-indentation) 7))
    (forward-line 1)
    (should (eq (car (python-indent-context)) :after-block-start))
@@ -1174,6 +1174,118 @@ CHOICES = (('some', 'choice'),
    ;; This signals an error if the test fails
    (should (eq (car (python-indent-context)) :inside-paren-newline-start))))
 
+(ert-deftest python-indent-inside-paren-block-1 ()
+  "`python-indent-block-paren-deeper' set to nil (default).
+See Bug#62696."
+  (python-tests-with-temp-buffer
+   "
+if ('VALUE' in my_unnecessarily_long_dictionary and
+    some_other_long_condition_case):
+    do_something()
+elif (some_case or
+      another_case):
+    do_another()
+"
+   (python-tests-look-at "if")
+   (should (eq (car (python-indent-context)) :no-indent))
+   (should (= (python-indent-calculate-indentation) 0))
+   (forward-line 1)
+   (should (eq (car (python-indent-context)) :inside-paren-from-block))
+   (should (= (python-indent-calculate-indentation) 4))
+   (forward-line 1)
+   (should (eq (car (python-indent-context)) :after-block-start))
+   (should (= (python-indent-calculate-indentation) 4))
+   (forward-line 1)
+   (should (eq (car (python-indent-context)) :at-dedenter-block-start))
+   (should (= (python-indent-calculate-indentation) 0))
+   (forward-line 1)
+   (should (eq (car (python-indent-context)) :inside-paren-from-block))
+   (should (= (python-indent-calculate-indentation) 6))
+   (forward-line 1)
+   (should (eq (car (python-indent-context)) :after-block-start))
+   (should (= (python-indent-calculate-indentation) 4))))
+
+(ert-deftest python-indent-inside-paren-block-2 ()
+  "`python-indent-block-paren-deeper' set to t.
+See Bug#62696."
+  (python-tests-with-temp-buffer
+   "
+if ('VALUE' in my_unnecessarily_long_dictionary and
+        some_other_long_condition_case):
+    do_something()
+elif (some_case or
+      another_case):
+    do_another()
+"
+   (let ((python-indent-block-paren-deeper t))
+     (python-tests-look-at "if")
+     (should (eq (car (python-indent-context)) :no-indent))
+     (should (= (python-indent-calculate-indentation) 0))
+     (forward-line 1)
+     (should (eq (car (python-indent-context)) :inside-paren-from-block))
+     (should (= (python-indent-calculate-indentation) 8))
+     (forward-line 1)
+     (should (eq (car (python-indent-context)) :after-block-start))
+     (should (= (python-indent-calculate-indentation) 4))
+     (forward-line 1)
+     (should (eq (car (python-indent-context)) :at-dedenter-block-start))
+     (should (= (python-indent-calculate-indentation) 0))
+     (forward-line 1)
+     (should (eq (car (python-indent-context)) :inside-paren-from-block))
+     (should (= (python-indent-calculate-indentation) 6))
+     (forward-line 1)
+     (should (eq (car (python-indent-context)) :after-block-start))
+     (should (= (python-indent-calculate-indentation) 4)))))
+
+(ert-deftest python-indent-inside-paren-block-3 ()
+  "With backslash.  `python-indent-block-paren-deeper' set to nil (default).
+See Bug#62696."
+  (python-tests-with-temp-buffer
+   "
+if 'VALUE' in my_uncessarily_long_dictionary and\\
+   (some_other_long_condition_case or
+    another_case):
+    do_something()
+"
+   (python-tests-look-at "if")
+   (should (eq (car (python-indent-context)) :no-indent))
+   (should (= (python-indent-calculate-indentation) 0))
+   (forward-line 1)
+   (should (eq (car (python-indent-context))
+               :after-backslash-block-continuation))
+   (should (= (python-indent-calculate-indentation) 3))
+   (forward-line 1)
+   (should (eq (car (python-indent-context)) :inside-paren-from-block))
+   (should (= (python-indent-calculate-indentation) 4))
+   (forward-line 1)
+   (should (eq (car (python-indent-context)) :after-block-start))
+   (should (= (python-indent-calculate-indentation) 4))))
+
+(ert-deftest python-indent-inside-paren-block-4 ()
+  "With backslash.  `python-indent-block-paren-deeper' set to t.
+See Bug#62696."
+  (python-tests-with-temp-buffer
+   "
+if 'VALUE' in my_uncessarily_long_dictionary and\\
+   (some_other_long_condition_case or
+        another_case):
+    do_something()
+"
+   (let ((python-indent-block-paren-deeper t))
+     (python-tests-look-at "if")
+     (should (eq (car (python-indent-context)) :no-indent))
+     (should (= (python-indent-calculate-indentation) 0))
+     (forward-line 1)
+     (should (eq (car (python-indent-context))
+                 :after-backslash-block-continuation))
+     (should (= (python-indent-calculate-indentation) 3))
+     (forward-line 1)
+     (should (eq (car (python-indent-context)) :inside-paren-from-block))
+     (should (= (python-indent-calculate-indentation) 8))
+     (forward-line 1)
+     (should (eq (car (python-indent-context)) :after-block-start))
+     (should (= (python-indent-calculate-indentation) 4)))))
+
 (ert-deftest python-indent-after-block-1 ()
   "The most simple after-block case that shouldn't fail."
   (python-tests-with-temp-buffer
@@ -1670,7 +1782,7 @@ a == 4):
    (should (= (python-indent-calculate-indentation) 0))
    (should (= (python-indent-calculate-indentation t) 0))
    (python-tests-look-at "a == 4):\n")
-   (should (eq (car (python-indent-context)) :inside-paren))
+   (should (eq (car (python-indent-context)) :inside-paren-from-block))
    (should (= (python-indent-calculate-indentation) 6))
    (python-indent-line)
    (should (= (python-indent-calculate-indentation t) 4))