Link to new operation user docs

The help button in the operations window now links to the new user docs.

THe new docs have a link to the API docs if needed.

docs/ext/operations_user_doc.py

@@ -72,6 +72,9 @@ def run(self) -> List[Node]:
                 rst_lines += get_params(op.filter_func.__doc__)
                 rst_lines.append("")
 
+            rst_lines.append(f":class:`{op.filter_name} API docs<{op.__module__}>`")
+            rst_lines.append("")
+
         rst = ViewList()
         for n, rst_line in enumerate(rst_lines):
             rst.append(rst_line, "generated.rst", n)

mantidimaging/core/net/help_pages.py

@@ -1,19 +1,26 @@
 # Copyright (C) 2021 ISIS Rutherford Appleton Laboratory UKRI
 # SPDX - License - Identifier: GPL-3.0-or-later
 
+from typing import Optional
+
 from PyQt5.QtCore import QUrl
 from PyQt5.QtGui import QDesktopServices
 
 DOCS_BASE = "https://mantidproject.github.io/mantidimaging"
-SECTION_API = f"{DOCS_BASE}/api/"
 SECTION_USER_GUIDE = f"{DOCS_BASE}/user_guide/"
 
 
-def open_api_webpage(page_url: str):
-    open_help_webpage(SECTION_API, page_url)
+def open_user_operation_docs(operation_name: str):
+    page_url = "operations/index"
+    section = operation_name.lower().replace(" ", "-")
+    open_help_webpage(SECTION_USER_GUIDE, page_url, section)
+
 
+def open_help_webpage(section_url: str, page_url: str, section: Optional[str] = None):
+    if section is not None:
+        url = f"{section_url}{page_url}.html#{section}"
+    else:
+        url = f"{section_url}{page_url}.html"
 
-def open_help_webpage(section_url: str, page_url: str):
-    url = QUrl(f"{section_url}{page_url}.html")
-    if not QDesktopServices.openUrl(url):
-        raise RuntimeError(f"Url could not be opened: {url.toString()}")
+    if not QDesktopServices.openUrl(QUrl(url)):
+        raise RuntimeError(f"Url could not be opened: {url}")

mantidimaging/gui/windows/operations/view.py

@@ -9,7 +9,7 @@
                              QPushButton, QSizePolicy, QSplitter, QStyle, QVBoxLayout)
 from pyqtgraph import ImageItem
 
-from mantidimaging.core.net.help_pages import open_api_webpage
+from mantidimaging.core.net.help_pages import open_user_operation_docs
 from mantidimaging.gui.mvp_base import BaseMainWindowView
 from mantidimaging.gui.utility import delete_all_widgets_from_layout
 from mantidimaging.gui.widgets.mi_image_view.view import MIImageView
@@ -188,11 +188,10 @@ def show_operation_completed(self, operation_name):
         self.notification_text.setText(f"{operation_name} completed successfully!")
 
     def open_help_webpage(self):
-        filter_id = self.presenter.model._find_filter_index_from_filter_name(self.filterSelector.currentText())
-        filter_module_path = self.presenter.get_filter_module_name(filter_id)
+        filter_name = self.filterSelector.currentText()
 
         try:
-            open_api_webpage(filter_module_path)
+            open_user_operation_docs(filter_name)
         except RuntimeError as err:
             self.show_error_dialog(str(err))