Some manual .format() -> f-strings

pre_commit/commands/autoupdate.py

@@ -80,13 +80,12 @@ def _check_hooks_still_exist_at_rev(
     hooks_missing = hooks - {hook['id'] for hook in manifest}
     if hooks_missing:
         raise RepositoryCannotBeUpdatedError(
-            'Cannot update because the tip of master is missing these hooks:\n'
-            '{}'.format(', '.join(sorted(hooks_missing))),
+            f'Cannot update because the tip of HEAD is missing these hooks:\n'
+            f'{", ".join(sorted(hooks_missing))}',
         )
 
 
 REV_LINE_RE = re.compile(r'^(\s+)rev:(\s*)([^\s#]+)(.*)(\r?\n)$', re.DOTALL)
-REV_LINE_FMT = '{}rev:{}{}{}{}'
 
 
 def _original_lines(
@@ -126,9 +125,7 @@ def _write_new_config(path: str, rev_infos: List[Optional[RevInfo]]) -> None:
             comment = ''
         else:
             comment = match.group(4)
-        lines[idx] = REV_LINE_FMT.format(
-            match.group(1), match.group(2), new_rev, comment, match.group(5),
-        )
+        lines[idx] = f'{match[1]}rev:{match[2]}{new_rev}{comment}{match[5]}'
 
     with open(path, 'w') as f:
         f.write(''.join(lines))

pre_commit/commands/install_uninstall.py

@@ -89,8 +89,8 @@ def _install_hook_script(
         os.remove(legacy_path)
     elif os.path.exists(legacy_path):
         output.write_line(
-            'Running in migration mode with existing hooks at {}\n'
-            'Use -f to use only pre-commit.'.format(legacy_path),
+            f'Running in migration mode with existing hooks at {legacy_path}\n'
+            f'Use -f to use only pre-commit.',
         )
 
     params = {
@@ -110,7 +110,7 @@ def _install_hook_script(
         hook_file.write(before + TEMPLATE_START)
         for line in to_template.splitlines():
             var = line.split()[0]
-            hook_file.write('{} = {!r}\n'.format(var, params[var]))
+            hook_file.write(f'{var} = {params[var]!r}\n')
         hook_file.write(TEMPLATE_END + after)
     make_executable(hook_path)
 

pre_commit/commands/run.py

@@ -243,9 +243,10 @@ def _run_hooks(
         output.write_line('All changes made by hooks:')
         # args.color is a boolean.
         # See user_color function in color.py
+        git_color_opt = 'always' if args.color else 'never'
         subprocess.call((
             'git', '--no-pager', 'diff', '--no-ext-diff',
-            '--color={}'.format({True: 'always', False: 'never'}[args.color]),
+            f'--color={git_color_opt}',
         ))
 
     return retval
@@ -282,8 +283,8 @@ def run(
         return 1
     if _has_unstaged_config(config_file) and not no_stash:
         logger.error(
-            'Your pre-commit configuration is unstaged.\n'
-            '`git add {}` to fix this.'.format(config_file),
+            f'Your pre-commit configuration is unstaged.\n'
+            f'`git add {config_file}` to fix this.',
         )
         return 1
 
@@ -308,9 +309,7 @@ def run(
 
         if args.hook and not hooks:
             output.write_line(
-                'No hook with id `{}` in stage `{}`'.format(
-                    args.hook, args.hook_stage,
-                ),
+                f'No hook with id `{args.hook}` in stage `{args.hook_stage}`',
             )
             return 1