show default filepath in Export plugin

CHANGES.rst

@@ -14,6 +14,8 @@ New Features
 - Descriptions are shown in the color mode dropdown for image layers to help describe the use-cases
   for ``Colormap`` vs ``Color``. [#2894]
 
+- Display default filepath in Export plugin. [#2896]
+
 Cubeviz
 ^^^^^^^
 

jdaviz/configs/default/plugins/export/export.py

@@ -81,6 +81,8 @@ class Export(PluginTemplateMixin, ViewerSelectMixin, SubsetSelectMixin,
     filename_auto = Bool(True).tag(sync=True)
     filename_invalid_msg = Unicode('').tag(sync=True)
 
+    default_filepath = Unicode().tag(sync=True)
+
     # if selected subset is spectral or composite, display message and disable export
     subset_invalid_msg = Unicode().tag(sync=True)
     data_invalid_msg = Unicode().tag(sync=True)
@@ -254,6 +256,12 @@ def _set_filename_default(self, *args, **kwargs):
         else:
             self.filename_default = ''
 
+        # Call to initially set the default filepath
+        if hasattr(self, 'viewer_format') and self.filename_default:
+            self._normalize_filename(filename=self.filename_default,
+                                     filetype=self.viewer_format.selected,
+                                     default_path=True)
+
     @observe('filename_value')
     def _is_filename_changed(self, event):
         # Clear overwrite warning when user changes filename
@@ -333,7 +341,7 @@ def _set_dataset_not_supported_msg(self, msg=None):
         else:
             self.data_invalid_msg = ''
 
-    def _normalize_filename(self, filename=None, filetype=None, overwrite=False):
+    def _normalize_filename(self, filename=None, filetype=None, overwrite=False, default_path=False):  # noqa: E501
         # Make sure filename is valid and file does not end up in weird places in standalone mode.
         if not filename:
             raise ValueError("Invalid filename")
@@ -349,6 +357,12 @@ def _normalize_filename(self, filename=None, filetype=None, overwrite=False):
         elif ((not filepath or str(filepath).startswith(".")) and os.environ.get("JDAVIZ_START_DIR", "")):  # noqa: E501 # pragma: no cover
             filename = os.environ["JDAVIZ_START_DIR"] / filename
 
+        # Set the default filepath to inform user where file will be exported to
+        if default_path:
+            if not filepath.is_absolute():
+                abs_path = filepath.resolve()
+                self.default_filepath = str(abs_path)
+
         if filename.exists() and not overwrite:
             self.overwrite_warn = True
         else:

jdaviz/configs/default/plugins/export/export.vue

@@ -225,6 +225,18 @@
     <div style="display: grid; position: relative"> <!-- overlay container -->
     <div style="grid-area: 1/1">
 
+    <v-row class="row-no-outside-padding row-min-bottom-padding">
+      <v-col>
+        <v-text-field
+          :value="filepath_value"
+          label="Filepath"
+          hint="Default filepath export location."
+          persistent-hint
+          disabled
+        ></v-text-field>
+      </v-col>
+    </v-row>
+
     <plugin-auto-label
       :value.sync="filename_value"
       :default="filename_default"