Cap hook output at terminal width to prevent wrapping

Previously, _compute_cols() would calculate the ideal column width based
on hook names and message lengths, with a minimum of 80 columns. However,
it didn't consider the actual terminal width, causing the "Passed/Failed"
status to wrap to the next line on narrower terminals.

This change:
- Adds terminal width detection using shutil.get_terminal_size()
- Caps the column width at the terminal width to prevent wrapping
- Maintains the minimum of 80 columns when terminal is wide enough
- Falls back to 80 columns if terminal size cannot be determined

The algorithm now ensures output always fits within the terminal width,
similar to how pytest handles its output formatting.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Kamil Monicz <kamil@monicz.dev>
Co-Authored-By: Claude <noreply@anthropic.com>

pre_commit/commands/run.py

@@ -6,6 +6,7 @@ import functools
 import logging
 import os
 import re
+import shutil
 import subprocess
 import time
 import unicodedata
@@ -247,7 +248,15 @@ def _compute_cols(hooks: Sequence[Hook]) -> int:
         name_len = 0
 
     cols = name_len + 3 + len(NO_FILES) + 1 + len(SKIPPED)
-    return max(cols, 80)
+    cols = max(cols, 80)
+
+    # Cap at terminal width to prevent wrapping
+    try:
+        term_width = shutil.get_terminal_size().columns
+    except OSError:
+        term_width = 80
+
+    return min(cols, term_width)
 
 
 def _all_filenames(args: argparse.Namespace) -> Iterable[str]:

tests/commands/run_test.py

@@ -574,21 +574,45 @@ def test_rebase(cap_out, store, repo_with_passing_hook):
 
 
 @pytest.mark.parametrize(
-    ('hooks', 'expected'),
+    ('term_width', 'hooks', 'expected'),
     (
-        ([], 80),
-        ([auto_namedtuple(id='a', name='a' * 51)], 81),
+        # Default 80-column terminal
+        (80, [], 80),
+        (80, [auto_namedtuple(id='a', name='a' * 51)], 80),
         (
+            80,
+            [
+                auto_namedtuple(id='a', name='a' * 51),
+                auto_namedtuple(id='b', name='b' * 52),
+            ],
+            80,
+        ),
+        # Wide terminal - ideal width is used
+        (120, [], 80),
+        (120, [auto_namedtuple(id='a', name='a' * 51)], 81),
+        (
+            120,
             [
                 auto_namedtuple(id='a', name='a' * 51),
                 auto_namedtuple(id='b', name='b' * 52),
             ],
             82,
         ),
+        # Narrow terminal - capped at terminal width
+        (70, [], 70),
+        (70, [auto_namedtuple(id='a', name='a' * 10)], 70),
     ),
 )
-def test_compute_cols(hooks, expected):
-    assert _compute_cols(hooks) == expected
+def test_compute_cols(term_width, hooks, expected):
+    class FakeTerminalSize:
+        def __init__(self):
+            self.columns = term_width
+
+    with mock.patch(
+        'shutil.get_terminal_size',
+        return_value=FakeTerminalSize(),
+    ):
+        assert _compute_cols(hooks) == expected
 
 
 @pytest.mark.parametrize(