refactor(analyzer): redefine *_analyzer into steps

- update imports and names
- define step as a protocol
- extract analyzer function from classes

analyzer/libretime_analyzer/steps/analyze_playability.py

@@ -1,49 +1,45 @@
 __author__ = "asantoni"
 
 import subprocess
+from typing import Any, Dict
 
 from loguru import logger
 
-from .analyzer import Analyzer
-
 
 class UnplayableFileError(Exception):
     pass
 
 
-class PlayabilityAnalyzer(Analyzer):
-    """This class checks if a file can actually be played with Liquidsoap."""
+LIQUIDSOAP_EXECUTABLE = "liquidsoap"
 
-    LIQUIDSOAP_EXECUTABLE = "liquidsoap"
 
-    @staticmethod
-    def analyze(filename, metadata):
-        """Checks if a file can be played by Liquidsoap.
-        :param filename: The full path to the file to analyzer
-        :param metadata: A metadata dictionary where the results will be put
-        :return: The metadata dictionary
-        """
-        command = [
-            PlayabilityAnalyzer.LIQUIDSOAP_EXECUTABLE,
-            "-v",
-            "-c",
-            "output.dummy(audio_to_stereo(single(argv(1))))",
-            "--",
-            filename,
-        ]
-        try:
-            subprocess.check_output(command, stderr=subprocess.STDOUT, close_fds=True)
+def analyze_playability(filename: str, metadata: Dict[str, Any]):
+    """Checks if a file can be played by Liquidsoap.
+    :param filename: The full path to the file to analyzer
+    :param metadata: A metadata dictionary where the results will be put
+    :return: The metadata dictionary
+    """
+    command = [
+        LIQUIDSOAP_EXECUTABLE,
+        "-v",
+        "-c",
+        "output.dummy(audio_to_stereo(single(argv(1))))",
+        "--",
+        filename,
+    ]
+    try:
+        subprocess.check_output(command, stderr=subprocess.STDOUT, close_fds=True)
 
-        except OSError as e:  # liquidsoap was not found
-            logger.warning(
-                "Failed to run: %s - %s. %s"
-                % (command[0], e.strerror, "Do you have liquidsoap installed?")
-            )
-        except (
-            subprocess.CalledProcessError,
-            Exception,
-        ) as e:  # liquidsoap returned an error code
-            logger.warning(e)
-            raise UnplayableFileError()
+    except OSError as e:  # liquidsoap was not found
+        logger.warning(
+            "Failed to run: %s - %s. %s"
+            % (command[0], e.strerror, "Do you have liquidsoap installed?")
+        )
+    except (
+        subprocess.CalledProcessError,
+        Exception,
+    ) as e:  # liquidsoap returned an error code
+        logger.warning(e)
+        raise UnplayableFileError()
 
-        return metadata
+    return metadata