1 files changed, 82 insertions, 18 deletions

diff --git a/mesonbuild/modules/fs.py b/mesonbuild/modules/fs.py
index 61ad917..86861ae 100644
--- a/mesonbuild/modules/fs.py
+++ b/mesonbuild/modules/fs.py
@@ -12,13 +12,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
+import typing
+import hashlib
+from pathlib import Path, PurePath
 
+from .. import mlog
 from . import ExtensionModule
 from . import ModuleReturnValue
 from ..mesonlib import MesonException
 
 from ..interpreterbase import stringArgs, noKwargs
+if typing.TYPE_CHECKING:
+    from ..interpreter import ModuleState
 
 class FSModule(ExtensionModule):
 
@@ -26,34 +31,93 @@ class FSModule(ExtensionModule):
         super().__init__(interpreter)
         self.snippets.add('generate_dub_file')
 
+    def _resolve_dir(self, state: 'ModuleState', arg: str) -> Path:
+        """
+        resolves (makes absolute) a directory relative to calling meson.build,
+        if not already absolute
+        """
+        return Path(state.source_root) / state.subdir / Path(arg).expanduser()
+
+    def _check(self, check: str, state: 'ModuleState', args: typing.Sequence[str]) -> ModuleReturnValue:
+        if len(args) != 1:
+            MesonException('fs.{} takes exactly one argument.'.format(check))
+        test_file = self._resolve_dir(state, args[0])
+        return ModuleReturnValue(getattr(test_file, check)(), [])
+
     @stringArgs
     @noKwargs
-    def exists(self, state, args, kwargs):
-        if len(args) != 1:
-            MesonException('method takes exactly one argument.')
-        test_file = os.path.join(state.source_root, state.subdir, args[0])
-        return ModuleReturnValue(os.path.exists(test_file), [])
+    def exists(self, state: 'ModuleState', args: typing.Sequence[str], kwargs: dict) -> ModuleReturnValue:
+        return self._check('exists', state, args)
 
-    def _check(self, check_fun, state, args):
-        if len(args) != 1:
-            MesonException('method takes exactly one argument.')
-        test_file = os.path.join(state.source_root, state.subdir, args[0])
-        return ModuleReturnValue(check_fun(test_file), [])
+    @stringArgs
+    @noKwargs
+    def is_symlink(self, state: 'ModuleState', args: typing.Sequence[str], kwargs: dict) -> ModuleReturnValue:
+        return self._check('is_symlink', state, args)
 
     @stringArgs
     @noKwargs
-    def is_symlink(self, state, args, kwargs):
-        return self._check(os.path.islink, state, args)
+    def is_file(self, state: 'ModuleState', args: typing.Sequence[str], kwargs: dict) -> ModuleReturnValue:
+        return self._check('is_file', state, args)
 
     @stringArgs
     @noKwargs
-    def is_file(self, state, args, kwargs):
-        return self._check(os.path.isfile, state, args)
+    def is_dir(self, state: 'ModuleState', args: typing.Sequence[str], kwargs: dict) -> ModuleReturnValue:
+        return self._check('is_dir', state, args)
 
     @stringArgs
     @noKwargs
-    def is_dir(self, state, args, kwargs):
-        return self._check(os.path.isdir, state, args)
+    def hash(self, state: 'ModuleState', args: typing.Sequence[str], kwargs: dict) -> ModuleReturnValue:
+        if len(args) != 2:
+            MesonException('method takes exactly two arguments.')
+        file = self._resolve_dir(state, args[0])
+        if not file.is_file():
+            raise MesonException('{} is not a file and therefore cannot be hashed'.format(file))
+        try:
+            h = hashlib.new(args[1])
+        except ValueError:
+            raise MesonException('hash algorithm {} is not available'.format(args[1]))
+        mlog.debug('computing {} sum of {} size {} bytes'.format(args[1], file, file.stat().st_size))
+        h.update(file.read_bytes())
+        return ModuleReturnValue(h.hexdigest(), [])
+
+    @stringArgs
+    @noKwargs
+    def size(self, state: 'ModuleState', args: typing.Sequence[str], kwargs: dict) -> ModuleReturnValue:
+        if len(args) != 1:
+            MesonException('method takes exactly one argument.')
+        file = self._resolve_dir(state, args[0])
+        if not file.is_file():
+            raise MesonException('{} is not a file and therefore cannot be sized'.format(file))
+        try:
+            return ModuleReturnValue(file.stat().st_size, [])
+        except ValueError:
+            raise MesonException('{} size could not be determined'.format(args[0]))
+
+    @stringArgs
+    @noKwargs
+    def samefile(self, state: 'ModuleState', args: typing.Sequence[str], kwargs: dict) -> ModuleReturnValue:
+        if len(args) != 2:
+            MesonException('method takes exactly two arguments.')
+        file1 = self._resolve_dir(state, args[0])
+        file2 = self._resolve_dir(state, args[1])
+        if not file1.exists():
+            raise MesonException('{} is not a file, symlink or directory and therefore cannot be compared'.format(file1))
+        if not file2.exists():
+            raise MesonException('{} is not a file, symlink or directory and therefore cannot be compared'.format(file2))
+        try:
+            return ModuleReturnValue(file1.samefile(file2), [])
+        except OSError:
+            raise MesonException('{} could not be compared to {}'.format(file1, file2))
+
+    @stringArgs
+    @noKwargs
+    def replace_suffix(self, state: 'ModuleState', args: typing.Sequence[str], kwargs: dict) -> ModuleReturnValue:
+        if len(args) != 2:
+            MesonException('method takes exactly two arguments.')
+        original = PurePath(args[0])
+        new = original.with_suffix(args[1])
+        return ModuleReturnValue(str(new), [])
+
 
-def initialize(*args, **kwargs):
+def initialize(*args, **kwargs) -> FSModule:
     return FSModule(*args, **kwargs)