test(fortran): isolate further

Author: mbdevpl

test/test_dependencies.py

@@ -6,10 +6,6 @@
 
 class Tests(unittest.TestCase):
 
-    def test_gfortran(self):
-        gfortran_path = shutil.which('gfortran')
-        self.assertIsNotNone(gfortran_path)
-
     def test_swig(self):
         swig_path = shutil.which('swig')
         self.assertIsNotNone(swig_path)

test/test_fortran.py

@@ -13,23 +13,23 @@
 from transpyle.general import AstGeneralizer, Binder, CodeReader, Compiler, Parser, Unparser
 try:
     from transpyle.fortran.parser import FortranParser
-except ImportError:
+except (ImportError, ExternalToolError):
     pass
 try:
     from transpyle.fortran.ast_generalizer import FortranAstGeneralizer
-except ImportError:
+except (ImportError, ExternalToolError):
     pass
 try:
     from transpyle.fortran.unparser import Fortran77Unparser
-except ImportError:
+except (ImportError, ExternalToolError):
     pass
 try:
     from transpyle.fortran.compiler import F2PyCompiler
-except ImportError:
+except (ImportError, ExternalToolError):
     pass
 try:
     from transpyle.fortran.compiler_interface import GfortranInterface, PgifortranInterface
-except ImportError:
+except (ImportError, ExternalToolError):
     pass
 
 from .common import \

transpyle/__init__.py

@@ -28,7 +28,7 @@
 
 try:
     from .fortran import *
-except ImportError:
+except (ImportError, ExternalToolError):
     _LOG.warning("Fortran unavailable")
 
 # try:

transpyle/fortran/compiler_interface.py

@@ -5,8 +5,10 @@
 
 import argunparse
 import numpy.f2py
+import version_query
 
-from ..general import call_tool, CompilerInterface
+from ..general import call_tool, CompilerInterface, ExternalTool
+from ..general.exc import ExternalToolVersionError
 
 _LOG = logging.getLogger(__name__)
 
@@ -33,6 +35,24 @@ class GfortranInterface(CompilerInterface):
     }
 
 
+class Gfortran(ExternalTool):
+
+    """GNU Fortran compiler tool."""
+
+    path = GfortranInterface._executables['']
+    _version_arg = '--version'
+
+    @classmethod
+    def _version_output_filter(cls, output: str) -> str:
+        for output_line in output.splitlines():
+            if output_line.startswith('GNU Fortran '):
+                return output_line.split(' ')[-1]
+        raise ExternalToolVersionError(f'could not extract version from output: {output}')
+
+
+Gfortran.assert_version_at_least(version_query.Version(10, 0))
+
+
 class PgifortranInterface(CompilerInterface):
 
     """PGI Fortran compiler interface."""