Add --report argument to __main__.py to omit supported formats

.github/ISSUE_TEMPLATE/ISSUE_REPORT.md

@@ -48,6 +48,14 @@ Thank you.
 * Python: 
 * Pillow: 
 
+```text
+Please paste here the output of running `python3 -m PIL --report`,
+or the output of the following Python code:
+
+from PIL import features
+features.pilinfo(supported_formats=False)
+```
+
 <!--
 Please include **code** that reproduces the issue and whenever possible, an **image** that demonstrates the issue. Please upload images to GitHub, not to third-party file hosting sites. If necessary, add the image to a zip or tar archive.
 

Tests/test_features.py

@@ -129,9 +129,15 @@ def test_pilinfo() -> None:
     while lines[0].startswith("    "):
         lines = lines[1:]
     assert lines[0] == "-" * 68
-    assert lines[1].startswith("Python modules loaded from ")
-    assert lines[2].startswith("Binary modules loaded from ")
-    assert lines[3] == "-" * 68
+    assert lines[1].startswith("Python executable is")
+    lines = lines[2:]
+    if lines[0].startswith("Environment Python files loaded from"):
+        lines = lines[1:]
+    assert lines[0].startswith("System Python files loaded from")
+    assert lines[1] == "-" * 68
+    assert lines[2].startswith("Python Pillow modules loaded from ")
+    assert lines[3].startswith("Binary Pillow modules loaded from ")
+    assert lines[4] == "-" * 68
     jpeg = (
         "\n"
         + "-" * 68

Tests/test_main.py

@@ -15,9 +15,15 @@ def test_main() -> None:
     while lines[0].startswith("    "):
         lines = lines[1:]
     assert lines[0] == "-" * 68
-    assert lines[1].startswith("Python modules loaded from ")
-    assert lines[2].startswith("Binary modules loaded from ")
-    assert lines[3] == "-" * 68
+    assert lines[1].startswith("Python executable is")
+    lines = lines[2:]
+    if lines[0].startswith("Environment Python files loaded from"):
+        lines = lines[1:]
+    assert lines[0].startswith("System Python files loaded from")
+    assert lines[1] == "-" * 68
+    assert lines[2].startswith("Python Pillow modules loaded from ")
+    assert lines[3].startswith("Binary Pillow modules loaded from ")
+    assert lines[4] == "-" * 68
     jpeg = (
         os.linesep
         + "-" * 68

src/PIL/__main__.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import sys
+
 from .features import pilinfo
 
-pilinfo()
+pilinfo(supported_formats="--report" not in sys.argv)

src/PIL/features.py

@@ -230,6 +230,9 @@ def pilinfo(out=None, supported_formats=True):
     """
     Prints information about this installation of Pillow.
     This function can be called with ``python3 -m PIL``.
+    It can also be called with ``python3 -m PIL --report`` to have
+    "supported_formats" set to ``False``, omitting the list of all supported image
+    file formats.
 
     :param out:
         The output stream to print to. Defaults to ``sys.stdout`` if ``None``.
@@ -249,12 +252,17 @@ def pilinfo(out=None, supported_formats=True):
     for py_version in py_version[1:]:
         print(f"       {py_version.strip()}", file=out)
     print("-" * 68, file=out)
+    print(f"Python executable is {sys.executable or 'unknown'}", file=out)
+    if sys.prefix != sys.base_prefix:
+        print(f"Environment Python files loaded from {sys.prefix}", file=out)
+    print(f"System Python files loaded from {sys.base_prefix}", file=out)
+    print("-" * 68, file=out)
     print(
-        f"Python modules loaded from {os.path.dirname(Image.__file__)}",
+        f"Python Pillow modules loaded from {os.path.dirname(Image.__file__)}",
         file=out,
     )
     print(
-        f"Binary modules loaded from {os.path.dirname(Image.core.__file__)}",
+        f"Binary Pillow modules loaded from {os.path.dirname(Image.core.__file__)}",
         file=out,
     )
     print("-" * 68, file=out)