--no-truncate flag in show command

docs/cli.md

@@ -529,6 +529,7 @@ required by
 * `--outdated (-o)`: Show the latest version but only for packages that are outdated.
 * `--all (-a)`: Show all packages (even those not compatible with current system).
 * `--top-level (-T)`: Only show explicitly defined packages.
+* `--no-truncate`: Do not truncate the output based on the terminal width.
 
 {{% note %}}
 When `--only` is specified, `--with` and `--without` options are ignored.

src/poetry/console/commands/show.py

@@ -69,6 +69,11 @@ class ShowCommand(GroupCommand, EnvCommand):
             "Show all packages (even those not compatible with current system).",
         ),
         option("top-level", "T", "Show only top-level dependencies."),
+        option(
+            "no-truncate",
+            None,
+            "Do not truncate the output based on the terminal width.",
+        ),
     ]
 
     help = """The show command displays detailed information about a package, or
@@ -306,14 +311,18 @@ def _display_packages_information(
                         required_by_length, len(" from " + ",".join(required_by.keys()))
                     )
 
-        write_version = name_length + version_length + 3 <= width
-        write_latest = name_length + version_length + latest_length + 3 <= width
+        if self.option("no-truncate"):
+            write_version = write_latest = write_description = True
+            write_why = self.option("why")
+        else:
+            write_version = name_length + version_length + 3 <= width
+            write_latest = name_length + version_length + latest_length + 3 <= width
 
-        why_end_column = (
-            name_length + version_length + latest_length + required_by_length
-        )
-        write_why = self.option("why") and (why_end_column + 3) <= width
-        write_description = (why_end_column + 24) <= width
+            why_end_column = (
+                name_length + version_length + latest_length + required_by_length
+            )
+            write_why = self.option("why") and (why_end_column + 3) <= width
+            write_description = (why_end_column + 24) <= width
 
         requires = root.all_requires
 
@@ -391,7 +400,9 @@ def _display_packages_information(
                 if show_latest:
                     remaining -= latest_length
 
-                if len(locked.description) > remaining:
+                if len(locked.description) > remaining and not self.option(
+                    "no-truncate"
+                ):
                     description = description[: remaining - 3] + "..."
 
                 line += " " + description

tests/console/commands/test_show.py

@@ -1987,6 +1987,120 @@ def test_show_required_by_deps(
     assert actual == expected
 
 
+def test_show_entire_description_with_no_truncate(
+    tester: CommandTester, poetry: Poetry, installed: Repository
+) -> None:
+    poetry.package.add_dependency(Factory.create_dependency("cachy", "^0.2.0"))
+
+    cachy2 = get_package("cachy", "0.2.0")
+    cachy2.description = (
+        "This is a veeeeeeeery long description that should not be truncated."
+    )
+    cachy2.add_dependency(Factory.create_dependency("msgpack-python", ">=0.5 <0.6"))
+
+    installed.add_package(cachy2)
+
+    assert isinstance(poetry.locker, TestLocker)
+    poetry.locker.mock_lock_data(
+        {
+            "package": [
+                {
+                    "name": "cachy",
+                    "version": "0.2.0",
+                    "description": "This is a veeeeeeeery long description that should not be truncated.",
+                    "category": "main",
+                    "optional": False,
+                    "platform": "*",
+                    "python-versions": "*",
+                    "checksum": [],
+                    "dependencies": {"msgpack-python": ">=0.5 <0.6"},
+                },
+                {
+                    "name": "msgpack-python",
+                    "version": "0.5.1",
+                    "description": "",
+                    "category": "main",
+                    "optional": False,
+                    "platform": "*",
+                    "python-versions": "*",
+                    "checksum": [],
+                },
+            ],
+            "metadata": {
+                "python-versions": "*",
+                "platform": "*",
+                "content-hash": "123456789",
+                "files": {"cachy": [], "msgpack-python": []},
+            },
+        }
+    )
+
+    tester.execute("--no-truncate")
+
+    expected = """\
+cachy              0.2.0 This is a veeeeeeeery long description that should not be truncated.
+msgpack-python (!) 0.5.1"""
+
+    assert tester.io.fetch_output().strip() == expected
+
+
+def test_show_entire_description_with_truncate(
+    tester: CommandTester, poetry: Poetry, installed: Repository
+) -> None:
+    poetry.package.add_dependency(Factory.create_dependency("cachy", "^0.2.0"))
+
+    cachy2 = get_package("cachy", "0.2.0")
+    cachy2.description = (
+        "This is a veeeeeeeery long description that should be truncated."
+    )
+    cachy2.add_dependency(Factory.create_dependency("msgpack-python", ">=0.5 <0.6"))
+
+    installed.add_package(cachy2)
+
+    assert isinstance(poetry.locker, TestLocker)
+    poetry.locker.mock_lock_data(
+        {
+            "package": [
+                {
+                    "name": "cachy",
+                    "version": "0.2.0",
+                    "description": "This is a veeeeeeeery long description that should be truncated.",
+                    "category": "main",
+                    "optional": False,
+                    "platform": "*",
+                    "python-versions": "*",
+                    "checksum": [],
+                    "dependencies": {"msgpack-python": ">=0.5 <0.6"},
+                },
+                {
+                    "name": "msgpack-python",
+                    "version": "0.5.1",
+                    "description": "",
+                    "category": "main",
+                    "optional": False,
+                    "platform": "*",
+                    "python-versions": "*",
+                    "checksum": [],
+                },
+            ],
+            "metadata": {
+                "python-versions": "*",
+                "platform": "*",
+                "content-hash": "123456789",
+                "files": {"cachy": [], "msgpack-python": []},
+            },
+        }
+    )
+
+    tester.execute()
+
+    expected = """\
+cachy              0.2.0 This is a veeeeeeeery long description that should...
+msgpack-python (!) 0.5.1"""
+
+    assert tester.io.fetch_output().strip() == expected
+
+
 def test_show_errors_without_lock_file(tester: CommandTester, poetry: Poetry) -> None:
     assert not poetry.locker.lock.exists()