Add terminal support for mac with example .comeback file

comeback/plugins/terminal/main.py

@@ -0,0 +1,50 @@
+import pathlib
+from typing import Optional
+
+from comeback import utils
+
+
+def check_plugin(cwd: Optional[str] = None) -> utils.RUN_STATUS:
+    """Test if we can use this plugin"""
+    if cwd is None:
+        return False, 'cwd parameter is not set.'
+    if not pathlib.Path(cwd).is_dir():
+        return False, 'cwd is not an existing directory'
+    return True, None
+
+
+def run_windows(cwd: Optional[str]) -> utils.RUN_STATUS:
+    raise NotImplementedError()
+
+
+def run_linux(cwd: Optional[str]) -> utils.RUN_STATUS:
+    raise NotImplementedError()
+
+
+def run_mac(cwd: str) -> utils.RUN_STATUS:
+    terminal_type = 'iTerm'
+    apps_path = pathlib.Path('/Applications')
+    iterm_dir_pattern = '*[iI][tT]erm*'
+    results = list(apps_path.glob(iterm_dir_pattern))
+    if not results:
+        terminal_type = 'Terminal'
+
+    utils.run(f'open -a {terminal_type} {cwd}')
+
+    return True, 'Opened terminal successfully'
+
+
+def run_plugin(cwd: Optional[str]) -> utils.RUN_STATUS:
+    is_startable, err = check_plugin(cwd)
+    if not is_startable:
+        return False, err
+
+    assert isinstance(cwd, str)
+
+    platform = utils.get_platform()
+    if platform == 'windows':
+        return run_windows(cwd)
+    elif platform == 'linux':
+        return run_linux(cwd)
+    elif platform == 'mac':
+        return run_mac(cwd)

example/example_ktamir/.comeback

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+terminal:
+  cwd: /