feat: strip and truncate doc strings

Author: whwright

click_command_tree.py

@@ -47,6 +47,8 @@ def _print_tree(command, depth=0, is_last_item=False, is_last_parent=False):
     line = prefix * (depth - 1) + tree_item + command.name
     doc = command.command.__doc__
     if doc:
+        doc = doc.strip()
+        doc = doc[:80] + ' ...' if len(doc) > 80 else doc
         line += ' - {}'.format(doc)
 
     click.echo(line)

tests.py

@@ -191,6 +191,26 @@ def command_three():
 root
 ├── command-one
 └── command-three
+"""[1:]
+
+        self._assert_correct_output(root, expected_output)
+
+    def test_long_docstring(self):
+        @click.group(name='root')
+        def root():
+            pass
+
+        @root.command(name='command')
+        def command():
+            """
+            this is a really long multi line doc string this is a really long multi line doc string
+            this is a really long multi line doc string this is a really long multi line doc string
+            """
+            pass
+
+        expected_output = """
+root
+└── command - this is a really long multi line doc string this is a really long multi line doc ...
 """[1:]
 
         self._assert_correct_output(root, expected_output)