Implement automatic discovery of terminal adapters

README.md

@@ -178,7 +178,7 @@ Alternatively, you can delete images from this folder and it will not break the
    $ sudo apt-get update
    $ sudo apt install terminology
    ```
-* If you get the error `39:46: syntax error: Expected end of line but found identifier. (-2741)`: Locate the file `ITerm.py` in `pokemonterminal/adapter/implementations` and on line 7, change `iTerm` to `iTerm2`. If you still experience the error, try changing it to `iTerm 2`.
+* If you get the error `39:46: syntax error: Expected end of line but found identifier. (-2741)`: Locate the file `ITerm.py` in `pokemonterminal/terminal/adapters` and on line 9, change `iTerm` to `iTerm2`. If you still experience the error, try changing it to `iTerm 2`.
 
 ## Saving
 

pokemonterminal/adapter/__init__.py

@@ -1,24 +0,0 @@
-from pokemonterminal.adapter.implementations.ITerm import ITerm
-from pokemonterminal.adapter.implementations.NullAdapter import NullAdapter
-from pokemonterminal.adapter.implementations.Terminology import Terminology
-from pokemonterminal.adapter.implementations.Tilix import Tilix
-
-
-available_terminals = [
-    Terminology,
-    Tilix,
-    ITerm
-]
-
-
-def identify():
-    """
-    Identify the terminal we are using based on env vars.
-    :return: A terminal adapter interface or a NullAdapter.
-    :rtype: TerminalAdapterInterface
-    """
-    for terminal in available_terminals:
-        if terminal.is_available():
-            return terminal()
-
-    return NullAdapter()

pokemonterminal/adapter/base.py

@@ -1,22 +0,0 @@
-class TerminalAdapterInterface(object):
-    @staticmethod
-    def is_available():
-        """
-        :return: True if the environment implies we are using this terminal.
-        :rtype bool
-        """
-        raise NotImplementedError()
-
-    def set_image_file_path(self, image_file_path):
-        """
-        Set the background image of the terminal.
-        :param image_file_path: Path to an image file.
-        :rtype str
-        """
-        raise NotImplementedError()
-
-    def clear(self):
-        """
-        Clear the terminal's background image.
-        """
-        raise NotImplementedError()

pokemonterminal/adapter/implementations/ITerm.py

@@ -1,33 +0,0 @@
-import os
-import subprocess
-
-from pokemonterminal.adapter.base import TerminalAdapterInterface
-
-
-# OSA script that will change the terminal background image
-osa_script_fmt = """tell application "iTerm"
-\ttell current session of current window
-\t\tset background image to "{}"
-\tend tell
-end tell"""
-
-
-class ITerm(TerminalAdapterInterface):
-    @staticmethod
-    def is_available():
-        return os.environ.get("ITERM_PROFILE")
-
-    def __run_osascript(self, stream):
-        p = subprocess.Popen(['osascript'], stdout=subprocess.PIPE,
-                             stdin=subprocess.PIPE)
-        p.stdin.write(stream)
-        p.communicate()
-        p.stdin.close()
-
-    def set_image_file_path(self, image_file_path):
-        stdin = osa_script_fmt.format(image_file_path)
-        self.__run_osascript(str.encode(stdin))
-
-    def clear(self):
-        stdin = osa_script_fmt.format("")
-        self.__run_osascript(str.encode(stdin))

pokemonterminal/adapter/implementations/NullAdapter.py

@@ -1,15 +0,0 @@
-from pokemonterminal.adapter.base import TerminalAdapterInterface
-
-
-class NullAdapter(TerminalAdapterInterface):
-    err = "This terminal emulator is not supported."
-
-    @staticmethod
-    def is_available():
-        return True
-
-    def set_image_file_path(self, image_file_path):
-        print(self.err)
-
-    def clear(self):
-        print(self.err)

pokemonterminal/adapter/implementations/Terminology.py

@@ -1,15 +0,0 @@
-import os
-
-from pokemonterminal.adapter.base import TerminalAdapterInterface
-
-
-class Terminology(TerminalAdapterInterface):
-    @staticmethod
-    def is_available():
-        return os.environ.get("TERMINOLOGY") == '1'
-
-    def set_image_file_path(self, image_file_path):
-        os.system('tybg "{}"'.format(image_file_path))
-
-    def clear(self):
-        os.system("tybg")

pokemonterminal/scripter.py

@@ -1,17 +1,47 @@
 # Used for creating, running and analyzing applescript and bash scripts.
 import sys
 
-from pokemonterminal.adapter import identify
-from .wallpaper import get_current_adapters
+from .terminal import get_current_terminal_adapters
+from .wallpaper import get_current_wallpaper_adapters
 
+TERMINAL_PROVIDER = None
 WALLPAPER_PROVIDER = None
 
 
+def __init_terminal_provider():
+    global TERMINAL_PROVIDER
+    if TERMINAL_PROVIDER is not None:
+        return
+    providers = get_current_terminal_adapters()
+    if len(providers) > 1:
+        # All this if is really not supposed to happen at all whatsoever
+        # really what kind of person has 2 simultaneous D.E???
+        print("Multiple providers found select the appropriate one:")
+        [print(str(x)) for x in providers]
+        print("If some of these make no sense or are irrelevant please file" +
+              "an issue in https://github.com/LazoCoder/Pokemon-Terminal")
+        print("=> ", end='')
+        inp = None
+        while inp is None:
+            try:
+                inp = int(input())
+                if inp >= len(providers):
+                    raise ValueError()
+            except ValueError as _:
+                print("Invalid number, try again!")
+        TERMINAL_PROVIDER = providers[inp]
+    elif len(providers) <= 0:
+        print("Your terminal emulator isn't supported at this time.")
+        sys.exit()
+    else:
+        TERMINAL_PROVIDER = providers[0]
+
+
 def __init_wallpaper_provider():
     global WALLPAPER_PROVIDER
     if WALLPAPER_PROVIDER is not None:
         return
-    providers = get_current_adapters()
+    providers = get_current_wallpaper_adapters()
     if len(providers) > 1:
         # All this if is really not supposed to happen at all whatsoever
         # really what kind of person has 2 simultaneous D.E???
@@ -37,18 +67,16 @@ def __init_wallpaper_provider():
 
 
 def clear_terminal():
-    adapter = identify()
-    adapter.clear()
+    __init_terminal_provider()
+    TERMINAL_PROVIDER.clear()
 
 
 def change_terminal(image_file_path):
     if not isinstance(image_file_path, str):
         print("A image path must be passed to the change terminal function.")
         return
-    adapter = identify()
-    if adapter is None:
-        print("Terminal not supported")
-    adapter.set_image_file_path(image_file_path)
+    __init_terminal_provider()
+    TERMINAL_PROVIDER.change_terminal(image_file_path)
 
 
 def change_wallpaper(image_file_path):

pokemonterminal/terminal/__init__.py

@@ -0,0 +1,34 @@
+import os
+import importlib
+import inspect
+from .adapters import TerminalProvider
+
+
+def _is_adapter(member) -> bool:
+    return (inspect.isclass(member)
+            and issubclass(member, TerminalProvider)
+            and member != TerminalProvider)
+
+
+def _get_adapter_classes() -> [TerminalProvider]:
+    """
+    This methods reads all the modules in the adapters folder searching for
+    all the implementing wallpaper adapter classes
+    thanks for/adapted from https://github.com/cclauss/adapter_pattern/
+    """
+    dirname = os.path.join(os.path.dirname(
+        os.path.abspath(__file__)), 'adapters')
+    adapter_classes = []
+    for file_name in sorted(os.listdir(dirname)):
+        root, ext = os.path.splitext(file_name)
+        if ext.lower() == '.py' and not root.startswith('__'):
+            module = importlib.import_module(
+                '.' + root, 'pokemonterminal.terminal.adapters')
+            for _, c in inspect.getmembers(module, _is_adapter):
+                adapter_classes.append(c)
+    return adapter_classes
+
+
+def get_current_terminal_adapters() -> [TerminalProvider]:
+    arr = _get_adapter_classes()
+    return [x for x in arr if x.is_compatible()]

pokemonterminal/terminal/adapters/ITerm.py

@@ -0,0 +1,31 @@
+import os
+import subprocess
+
+from . import TerminalProvider as _TProv
+
+
+class ITerm(_TProv):
+    # OSA script that will change the terminal background image
+    osa_script_fmt = """tell application "iTerm"
+    \ttell current session of current window
+    \t\tset background image to "{}"
+    \tend tell
+    end tell"""
+
+    def is_compatible() -> bool:
+        return os.environ.get("ITERM_PROFILE")
+
+    def __run_osascript(stream):
+        p = subprocess.Popen(['osascript'], stdout=subprocess.PIPE,
+                             stdin=subprocess.PIPE)
+        p.stdin.write(stream)
+        p.communicate()
+        p.stdin.close()
+
+    def change_terminal(self, path: str):
+        stdin = self.osa_script_fmt.format(path)
+        self.__run_osascript(str.encode(stdin))
+
+    def clear(self):
+        stdin = self.osa_script_fmt.format("")
+        self.__run_osascript(str.encode(stdin))

pokemonterminal/terminal/adapters/Terminology.py

@@ -0,0 +1,14 @@
+import os
+
+from . import TerminalProvider as _TProv
+
+
+class Terminology(_TProv):
+    def is_compatible() -> bool:
+        return os.environ.get("TERMINOLOGY") == '1'
+
+    def change_terminal(path: str):
+        os.system('tybg "{}"'.format(path))
+
+    def clear():
+        os.system("tybg")

pokemonterminal/terminal/adapters/Tilix.py

@@ -1,21 +1,20 @@
 import os
 
-from pokemonterminal.adapter.base import TerminalAdapterInterface
+from . import TerminalProvider as _TProv
 
 
-class Tilix(TerminalAdapterInterface):
+class Tilix(_TProv):
     setting_key = "com.gexperts.Tilix.Settings"
     setting_field = "background-image"
 
-    @staticmethod
-    def is_available():
+    def is_compatible() -> bool:
         return "TILIX_ID" in os.environ
 
-    def set_image_file_path(self, image_file_path):
+    def change_terminal(self, path: str):
         command = 'gsettings set {} {} "{}"'
         os.system(command.format(self.setting_key,
                                  self.setting_field,
-                                 image_file_path))
+                                 path))
 
     def clear(self):
         command = 'gsettings set {} {}'

pokemonterminal/terminal/adapters/__init__.py

@@ -0,0 +1,27 @@
+class TerminalProvider:
+    """
+    Interface representing all the different terminal emulators supported
+    by pokemon-terminal if you want to implement a TE, create a module in this
+    folder that implements this interface, reflection will do the rest.
+    """
+
+    def change_terminal(path: str):
+        """
+        This sets the wallpaper of the corresponding TE of this adapter.
+        :param path The full path of the required pokemon image
+        """
+        raise NotImplementedError()
+
+    def is_compatible() -> bool:
+        """
+        checks for compatibility
+        :return a boolean saying whether or not the current adaptor is
+        compatible with the running TE
+        """
+        raise NotImplementedError()
+
+    def clear(self):
+        """
+        Clear the terminal's background image.
+        """
+        raise NotImplementedError()

pokemonterminal/wallpaper/__init__.py

@@ -29,6 +29,6 @@ def _get_adapter_classes() -> [WallpaperProvider]:
     return adapter_classes
 
 
-def get_current_adapters() -> [WallpaperProvider]:
+def get_current_wallpaper_adapters() -> [WallpaperProvider]:
     arr = _get_adapter_classes()
     return [x for x in arr if x.is_compatible()]