feat: split the folder actions out of the repository extension

Open Terminal Here and Open in Editor were bundled with git emblems, columns and a properties tab, but neither of them has anything to do with git and both work on any folder. They are their own plugin now, on the nemo-repo-core config and launcher layer.

The editor entry used to be shown only when Visual Studio Code was installed, whatever editor_command said; it now checks the configured command. The terminal entry is hidden when no emulator is present instead of appearing and doing nothing.

nemoFolderTools.py

@@ -0,0 +1,84 @@
+#!/usr/bin/python3
+"""nemo-folder-tools: "Open Terminal Here" and "Open in Editor" for Nemo.
+
+Nothing here is git specific: the entries appear on any local folder. The
+terminal and the editor command are configurable, and the terminal is
+detected from a list of the common emulators when it is not configured.
+
+Requires nemo-repo-core: https://github.com/dualfroz/nemo-repo-core
+"""
+
+import importlib.util
+import os
+import sys
+
+
+def _ensureCoreOnPath():
+    if importlib.util.find_spec("nemoRepoCore") is not None:
+        return
+    dataHome = os.environ.get("XDG_DATA_HOME") or os.path.expanduser("~/.local/share")
+    dataDirs = (os.environ.get("XDG_DATA_DIRS") or "/usr/local/share:/usr/share").split(":")
+    for base in [dataHome] + dataDirs:
+        candidate = os.path.join(base, "nemo-repo-core")
+        if os.path.isdir(os.path.join(candidate, "nemoRepoCore")):
+            sys.path.insert(0, candidate)
+            return
+
+
+_ensureCoreOnPath()
+
+import gi
+
+gi.require_version("Nemo", "3.0")
+from gi.repository import GObject, Nemo
+
+from nemoRepoCore import (coreConfig, editorAvailable, launchEditor,
+                          launchTerminal, localDirectoryPath, requireCore,
+                          resolveTerminal)
+
+requireCore("1.0.0")
+
+pluginDefaults = {
+    "actions": {
+        "open_terminal": True,
+        "open_editor": True,
+    },
+}
+
+coreConfig.registerDefaults(pluginDefaults)
+
+
+class FolderToolsMenuProvider(GObject.GObject, Nemo.MenuProvider,
+                              Nemo.NameAndDescProvider):
+
+    def _itemsFor(self, path):
+        items = []
+
+        if coreConfig.sectionFlag("actions", "open_terminal", True) and resolveTerminal():
+            item = Nemo.MenuItem(name="NemoFolderTools::open_terminal",
+                                 label="Open Terminal Here",
+                                 tip="Open a terminal in %s" % path)
+            item.connect("activate", lambda *arguments: launchTerminal(path))
+            items.append(item)
+
+        if coreConfig.sectionFlag("actions", "open_editor", True) and editorAvailable():
+            item = Nemo.MenuItem(name="NemoFolderTools::open_editor",
+                                 label="Open in Editor",
+                                 tip="Open %s in %s" % (path, coreConfig.editorCommand))
+            item.connect("activate", lambda *arguments: launchEditor(path))
+            items.append(item)
+
+        return items
+
+    def get_file_items(self, window, files):
+        if len(files) != 1:
+            return []
+        path = localDirectoryPath(files[0])
+        return self._itemsFor(path) if path else []
+
+    def get_background_items(self, window, currentFolder):
+        path = localDirectoryPath(currentFolder)
+        return self._itemsFor(path) if path else []
+
+    def get_name_and_desc(self):
+        return ["nemo-folder-tools:::Open Terminal Here and Open in Editor for any folder"]