f-strings

mesonbuild/interpreter/compiler.py

@@ -719,7 +719,7 @@ class CompilerHolder(ObjectHolder['Compiler']):
         result, cached = self.compiler.has_func_attribute(attr, self.environment)
         cached_msg = mlog.blue('(cached)') if cached else ''
         h = mlog.green('YES') if result else mlog.red('NO')
-        mlog.log('Compiler for {} supports function attribute {}:'.format(self.compiler.get_display_language(), attr), h, cached_msg)
+        mlog.log(f'Compiler for {self.compiler.get_display_language()} supports function attribute {attr}:', h, cached_msg)
         return result
 
     @FeatureNew('compiler.has_function_attribute', '0.48.0')

mesonbuild/mesonlib/universal.py

@@ -1467,8 +1467,8 @@ def _substitute_values_check_errors(command: T.List[str], values: T.Dict[str, T.
         # Error out if any output-derived templates are present in the command
         match = iter_regexin_iter(outregex, command)
         if match:
-            m = 'Command cannot have {!r} since there are no outputs'
+            m = f'Command cannot have {match!r} since there are no outputs'
-            raise MesonException(m.format(match))
+            raise MesonException(m)
     else:
         # Error out if an invalid @OUTPUTnn@ template was specified
         for each in command:

mesonbuild/minit.py

@@ -75,14 +75,12 @@ def autodetect_options(options: 'argparse.Namespace', sample: bool = False) -> N
     if not options.name:
         options.name = Path().resolve().stem
         if not re.match('[a-zA-Z_][a-zA-Z0-9]*', options.name) and sample:
-            raise SystemExit('Name of current directory "{}" is not usable as a sample project name.\n'
+            raise SystemExit(f'Name of current directory "{options.name}" is not usable as a sample project name.\n'
-                             'Specify a project name with --name.'.format(options.name))
+                             'Specify a project name with --name.')
-        print('Using "{}" (name of current directory) as project name.'
+        print(f'Using "{options.name}" (name of current directory) as project name.')
-              .format(options.name))
     if not options.executable:
         options.executable = options.name
-        print('Using "{}" (project name) as name of executable to build.'
+        print(f'Using "{options.executable}" (project name) as name of executable to build.')
-              .format(options.executable))
     if sample:
         # The rest of the autodetection is not applicable to generating sample projects.
         return

mesonbuild/minstall.py

@@ -181,8 +181,8 @@ def sanitize_permissions(path: str, umask: T.Union[str, int]) -> None:
     try:
         set_chmod(path, new_perms, follow_symlinks=False)
     except PermissionError as e:
-        msg = '{!r}: Unable to set permissions {!r}: {}, ignoring...'
+        msg = f'{path!r}: Unable to set permissions {new_perms!r}: {e.strerror}, ignoring...'
-        print(msg.format(path, new_perms, e.strerror))
+        print(msg)
 
 
 def set_mode(path: str, mode: T.Optional['FileMode'], default_umask: T.Union[str, int]) -> None:
@@ -195,15 +195,15 @@ def set_mode(path: str, mode: T.Optional['FileMode'], default_umask: T.Union[str
         try:
             set_chown(path, mode.owner, mode.group, follow_symlinks=False)
         except PermissionError as e:
-            msg = '{!r}: Unable to set owner {!r} and group {!r}: {}, ignoring...'
+            msg = f'{path!r}: Unable to set owner {mode.owner!r} and group {mode.group!r}: {e.strerror}, ignoring...'
-            print(msg.format(path, mode.owner, mode.group, e.strerror))
+            print(msg)
         except LookupError:
-            msg = '{!r}: Non-existent owner {!r} or group {!r}: ignoring...'
+            msg = f'{path!r}: Non-existent owner {mode.owner!r} or group {mode.group!r}: ignoring...'
-            print(msg.format(path, mode.owner, mode.group))
+            print(msg)
         except OSError as e:
             if e.errno == errno.EINVAL:
-                msg = '{!r}: Non-existent numeric owner {!r} or group {!r}: ignoring...'
+                msg = f'{path!r}: Non-existent numeric owner {mode.owner!r} or group {mode.group!r}: ignoring...'
-                print(msg.format(path, mode.owner, mode.group))
+                print(msg)
             else:
                 raise
     # Must set permissions *after* setting owner/group otherwise the
@@ -213,8 +213,8 @@ def set_mode(path: str, mode: T.Optional['FileMode'], default_umask: T.Union[str
         try:
             set_chmod(path, mode.perms, follow_symlinks=False)
         except PermissionError as e:
-            msg = '{!r}: Unable to set permissions {!r}: {}, ignoring...'
+            msg = '{path!r}: Unable to set permissions {mode.perms_s!r}: {e.strerror}, ignoring...'
-            print(msg.format(path, mode.perms_s, e.strerror))
+            print(msg)
     else:
         sanitize_permissions(path, default_umask)
 
@@ -400,15 +400,13 @@ class Installer:
                     makedirs: T.Optional[T.Tuple[T.Any, str]] = None) -> bool:
         outdir = os.path.split(to_file)[0]
         if not os.path.isfile(from_file) and not os.path.islink(from_file):
-            raise RuntimeError('Tried to install something that isn\'t a file:'
+            raise RuntimeError(f'Tried to install something that isn\'t a file: {from_file!r}')
-                               '{!r}'.format(from_file))
         # copyfile fails if the target file already exists, so remove it to
         # allow overwriting a previous install. If the target is not a file, we
         # want to give a readable error.
         if os.path.exists(to_file):
             if not os.path.isfile(to_file):
-                raise RuntimeError('Destination {!r} already exists and is not '
+                raise RuntimeError(f'Destination {to_file!r} already exists and is not a file')
-                                   'a file'.format(to_file))
             if self.should_preserve_existing_file(from_file, to_file):
                 append_to_log(self.lf, f'# Preserving old file {to_file}\n')
                 self.preserved_file_count += 1

mesonbuild/modules/cmake.py

@@ -307,7 +307,7 @@ class CmakeModule(ExtensionModule):
             with open(infile, encoding='utf-8') as fin:
                 data = fin.readlines()
         except Exception as e:
-            raise mesonlib.MesonException('Could not read input file {}: {}'.format(infile, str(e)))
+            raise mesonlib.MesonException(f'Could not read input file {infile}: {e!s}')
 
         result = []
         regex = re.compile(r'(?:\\\\)+(?=\\?@)|\\@|@([-a-zA-Z0-9_]+)@')

mesonbuild/modules/gnome.py

@@ -205,10 +205,10 @@ class GnomeModule(ExtensionModule):
                         '<https://bugzilla.gnome.org/show_bug.cgi?id=774368>'
                     raise MesonException(m)
             else:
-                m = 'Unexpected dependency type {!r} for gnome.compile_resources() ' \
+                m = f'Unexpected dependency type {dep!r} for gnome.compile_resources() ' \
                     '"dependencies" argument.\nPlease pass the return value of ' \
                     'custom_target() or configure_file()'
-                raise MesonException(m.format(dep))
+                raise MesonException(m)
 
         if not mesonlib.version_compare(glib_version, gresource_dep_needed_version):
             ifile = args[1]
@@ -327,8 +327,8 @@ class GnomeModule(ExtensionModule):
         except (FileNotFoundError, PermissionError):
             raise MesonException('Could not execute glib-compile-resources.')
         if pc.returncode != 0:
-            m = 'glib-compile-resources failed to get dependencies for {}:\n{}'
+            m = f'glib-compile-resources failed to get dependencies for {cmd[1]}:\n{stderr}'
-            mlog.warning(m.format(cmd[1], stderr))
+            mlog.warning(m)
             raise subprocess.CalledProcessError(pc.returncode, cmd)
 
         dep_files = stdout.split('\n')[:-1]
@@ -1224,8 +1224,8 @@ class GnomeModule(ExtensionModule):
         if not mesonlib.version_compare(glib_version, '>= 2.49.1'):
             # Warn if requested, silently disable if not
             if 'autocleanup' in kwargs:
-                mlog.warning('Glib version ({}) is too old to support the \'autocleanup\' '
+                mlog.warning(f'Glib version ({glib_version}) is too old to support the \'autocleanup\' '
-                             'kwarg, need 2.49.1 or newer'.format(glib_version))
+                             'kwarg, need 2.49.1 or newer')
             return []
         autocleanup = kwargs.pop('autocleanup', 'all')
         values = ('none', 'objects', 'all')
@@ -1518,7 +1518,7 @@ class GnomeModule(ExtensionModule):
             fhead += '%s\n' % body_prefix
         fhead += '#include "%s"\n' % hdr_filename
         for hdr in sources:
-            fhead += '#include "%s"\n' % os.path.basename(str(hdr))
+            fhead += '#include "{}"\n'.format(os.path.basename(str(hdr)))
         fhead += '''
 #define C_ENUM(v) ((gint) v)
 #define C_FLAGS(v) ((guint) v)
@@ -1529,12 +1529,12 @@ class GnomeModule(ExtensionModule):
 /* enumerations from "@basename@" */
 '''
 
-        c_file_kwargs['vhead'] = '''
+        c_file_kwargs['vhead'] = f'''
 GType
-%s@enum_name@_get_type (void)
+{func_prefix}@enum_name@_get_type (void)
-{
+{{
   static gsize gtype_id = 0;
-  static const G@Type@Value values[] = {''' % func_prefix
+  static const G@Type@Value values[] = {{'''
 
         c_file_kwargs['vprod'] = '    { C_@TYPE@(@VALUENAME@), "@VALUENAME@", "@valuenick@" },'
 
@@ -1553,22 +1553,22 @@ GType
         # .h file generation
         h_file_kwargs = copy.deepcopy(mkenums_kwargs)
 
-        h_file_kwargs['fhead'] = '''#pragma once
+        h_file_kwargs['fhead'] = f'''#pragma once
 
 #include <glib-object.h>
-{}
+{header_prefix}
 
 G_BEGIN_DECLS
-'''.format(header_prefix)
+'''
 
         h_file_kwargs['fprod'] = '''
 /* enumerations from "@basename@" */
 '''
 
-        h_file_kwargs['vhead'] = '''
+        h_file_kwargs['vhead'] = f'''
-{}
+{decl_decorator}
-GType {}@enum_name@_get_type (void);
+GType {func_prefix}@enum_name@_get_type (void);
-#define @ENUMPREFIX@_TYPE_@ENUMSHORT@ ({}@enum_name@_get_type())'''.format(decl_decorator, func_prefix, func_prefix)
+#define @ENUMPREFIX@_TYPE_@ENUMSHORT@ ({func_prefix}@enum_name@_get_type())'''
 
         h_file_kwargs['ftail'] = '''
 G_END_DECLS'''
@@ -1630,9 +1630,7 @@ G_END_DECLS'''
             elif arg in known_kwargs and value:
                 cmd += ['--' + arg.replace('_', '-')]
             elif arg not in known_custom_target_kwargs:
-                raise MesonException(
+                raise MesonException(f'Genmarshal does not take a {arg} keyword argument.')
-                    'Genmarshal does not take a {} keyword argument.'.format(
-                        arg))
 
         install_header = kwargs.pop('install_header', False)
         install_dir = kwargs.pop('install_dir', None)

mesonbuild/modules/hotdoc.py

@@ -406,8 +406,7 @@ class HotDocModule(ExtensionModule):
             from hotdoc.run_hotdoc import run  # noqa: F401
             self.hotdoc.run_hotdoc = run
         except Exception as e:
-            raise MesonException('hotdoc {} required but not found. ({})'.format(
+            raise MesonException(f'hotdoc {MIN_HOTDOC_VERSION} required but not found. ({e})')
-                MIN_HOTDOC_VERSION, e))
         self.methods.update({
             'has_extensions': self.has_extensions,
             'generate_doc': self.generate_doc,

mesonbuild/modules/i18n.py

@@ -230,7 +230,7 @@ class I18nModule(ExtensionModule):
         lang_arg = '--langs=' + '@@'.join(languages) if languages else None
 
         _datadirs = ':'.join(self._get_data_dirs(state, kwargs['data_dirs']))
-        datadirs = '--datadirs={}'.format(_datadirs) if _datadirs else None
+        datadirs = f'--datadirs={_datadirs}' if _datadirs else None
 
         extra_args = kwargs['args']
         targets: T.List['Target'] = []

mesonbuild/modules/pkgconfig.py

@@ -100,8 +100,7 @@ class DependenciesHelper:
             else:
                 raise mesonlib.MesonException('requires argument not a string, '
                                               'library with pkgconfig-generated file '
-                                              'or pkgconfig-dependency object, '
+                                              'or pkgconfig-dependency object, got {obj!r}')
-                                              'got {!r}'.format(obj))
         return processed_reqs
 
     def add_cflags(self, cflags):

mesonbuild/modules/python.py

@@ -141,8 +141,7 @@ class PythonSystemDependency(SystemDependency, _PythonDependencyBase):
             elif pycc.startswith(('i686', 'i386')):
                 return '32'
             else:
-                mlog.log('MinGW Python built with unknown CC {!r}, please file'
+                mlog.log(f'MinGW Python built with unknown CC {pycc!r}, please file a bug')
-                         'a bug'.format(pycc))
                 return None
         elif self.platform == 'win32':
             return '32'
@@ -199,8 +198,7 @@ class PythonSystemDependency(SystemDependency, _PythonDependencyBase):
             return
         # Pyarch ends in '32' or '64'
         if arch != pyarch:
-            mlog.log('Need', mlog.bold(self.name), 'for {}-bit, but '
+            mlog.log('Need', mlog.bold(self.name), f'for {arch}-bit, but found {pyarch}-bit')
-                     'found {}-bit'.format(arch, pyarch))
             self.is_found = False
             return
         # This can fail if the library is not found

mesonbuild/modules/unstable_cuda.py

@@ -294,8 +294,7 @@ class CudaModule(NewExtensionModule):
                 }.get(arch_name, (None, None))
 
             if arch_bin is None:
-                raise InvalidArguments('Unknown CUDA Architecture Name {}!'
+                raise InvalidArguments(f'Unknown CUDA Architecture Name {arch_name}!')
-                                       .format(arch_name))
 
             cuda_arch_bin += arch_bin
 

mesonbuild/programs.py

@@ -106,15 +106,15 @@ class ExternalProgram(mesonlib.HoldableObject):
             cmd: T.List[T.Union[str, ExternalProgram]] = [self, '--version']
             res = interpreter.run_command_impl(interpreter.current_node, cmd, {}, True)
             if res.returncode != 0:
-                m = 'Running {!r} failed'
+                m = f'Running {raw_cmd!r} failed'
-                raise mesonlib.MesonException(m.format(raw_cmd))
+                raise mesonlib.MesonException(m)
             output = res.stdout.strip()
             if not output:
                 output = res.stderr.strip()
             match = re.search(r'([0-9][0-9\.]+)', output)
             if not match:
-                m = 'Could not find a version number in output of {!r}'
+                m = f'Could not find a version number in output of {raw_cmd!r}'
-                raise mesonlib.MesonException(m.format(raw_cmd))
+                raise mesonlib.MesonException(m)
             self.cached_version = match.group(1)
         return self.cached_version
 

mesonbuild/wrap/wrap.py

@@ -118,7 +118,7 @@ class PackageDefinition:
             config = configparser.ConfigParser(interpolation=None)
             config.read(self.filename)
         except configparser.Error as e:
-            raise WrapException('Failed to parse {}: {}'.format(self.basename, str(e)))
+            raise WrapException(f'Failed to parse {self.basename}: {e!s}')
         self.parse_wrap_section(config)
         if self.type == 'redirect':
             # [wrap-redirect] have a `filename` value pointing to the real wrap
@@ -149,8 +149,8 @@ class PackageDefinition:
             raise WrapException(f'Missing sections in {self.basename}')
         self.wrap_section = config.sections()[0]
         if not self.wrap_section.startswith('wrap-'):
-            m = '{!r} is not a valid first section in {}'
+            m = f'{self.wrap_section!r} is not a valid first section in {self.basename}'
-            raise WrapException(m.format(self.wrap_section, self.basename))
+            raise WrapException(m)
         self.type = self.wrap_section[5:]
         self.values = dict(config[self.wrap_section])
 
@@ -169,18 +169,18 @@ class PackageDefinition:
                     self.provided_programs += names_list
                     continue
                 if not v:
-                    m = ('Empty dependency variable name for {!r} in {}. '
+                    m = (f'Empty dependency variable name for {k!r} in {self.basename}. '
                          'If the subproject uses meson.override_dependency() '
                          'it can be added in the "dependency_names" special key.')
-                    raise WrapException(m.format(k, self.basename))
+                    raise WrapException(m)
                 self.provided_deps[k] = v
 
     def get(self, key: str) -> str:
         try:
             return self.values[key]
         except KeyError:
-            m = 'Missing key {!r} in {}'
+            m = f'Missing key {key!r} in {self.basename}'
-            raise WrapException(m.format(key, self.basename))
+            raise WrapException(m)
 
 def get_directory(subdir_root: str, packagename: str) -> str:
     fname = os.path.join(subdir_root, packagename + '.wrap')
@@ -234,14 +234,14 @@ class Resolver:
             for k in wrap.provided_deps.keys():
                 if k in self.provided_deps:
                     prev_wrap = self.provided_deps[k]
-                    m = 'Multiple wrap files provide {!r} dependency: {} and {}'
+                    m = f'Multiple wrap files provide {k!r} dependency: {wrap.basename} and {prev_wrap.basename}'
-                    raise WrapException(m.format(k, wrap.basename, prev_wrap.basename))
+                    raise WrapException(m)
                 self.provided_deps[k] = wrap
             for k in wrap.provided_programs:
                 if k in self.provided_programs:
                     prev_wrap = self.provided_programs[k]
-                    m = 'Multiple wrap files provide {!r} program: {} and {}'
+                    m = f'Multiple wrap files provide {k!r} program: {wrap.basename} and {prev_wrap.basename}'
-                    raise WrapException(m.format(k, wrap.basename, prev_wrap.basename))
+                    raise WrapException(m)
                 self.provided_programs[k] = wrap
 
     def merge_wraps(self, other_resolver: 'Resolver') -> None:
@@ -279,8 +279,8 @@ class Resolver:
         self.directory = packagename
         self.wrap = self.wraps.get(packagename)
         if not self.wrap:
-            m = 'Neither a subproject directory nor a {}.wrap file was found.'
+            m = f'Neither a subproject directory nor a {self.packagename}.wrap file was found.'
-            raise WrapNotFoundException(m.format(self.packagename))
+            raise WrapNotFoundException(m)
         self.directory = self.wrap.directory
 
         if self.wrap.has_wrap:
@@ -387,8 +387,8 @@ class Resolver:
         elif out == '':
             # It is not a submodule, just a folder that exists in the main repository.
             return False
-        m = 'Unknown git submodule output: {!r}'
+        m = f'Unknown git submodule output: {out!r}'
-        raise WrapException(m.format(out))
+        raise WrapException(m)
 
     def get_file(self) -> None:
         path = self.get_file_internal('source')
@@ -568,8 +568,8 @@ class Resolver:
 
     def apply_patch(self) -> None:
         if 'patch_filename' in self.wrap.values and 'patch_directory' in self.wrap.values:
-            m = 'Wrap file {!r} must not have both "patch_filename" and "patch_directory"'
+            m = f'Wrap file {self.wrap.basename!r} must not have both "patch_filename" and "patch_directory"'
-            raise WrapException(m.format(self.wrap.basename))
+            raise WrapException(m)
         if 'patch_filename' in self.wrap.values:
             path = self.get_file_internal('patch')
             try: