feat: show basic map for "fixed" assets

this is just to get our foot in the door so to speak.  not sure yet
how sophisticated this map needs to be etc. but thought it would be
nice to at least show something..since the data is available

src/wuttafarm/web/templates/assets/master/view.mako

@@ -10,5 +10,74 @@
       </b-notification>
   % endif
 
+  <div style="display: flex; margin-right: 0.5rem;">
+
+    ## main form
+    <div style="flex-grow: 1;">
       ${parent.page_content()}
+    </div>
+
+    ## location map
+    % if map_polygon:
+        <div ref="map" style="flex-grow: 2; height: 500px;" />
+    % endif
+
+  </div>
+
+</%def>
+
+<%def name="modify_vue_vars()">
+  ${parent.modify_vue_vars()}
+  % if map_polygon:
+      <script>
+
+        ThisPageData.map = null
+
+        ThisPage.mounted = function() {
+
+            this.map = new maplibregl.Map({
+                container: this.$refs.map,
+                style: 'https://tiles.openfreemap.org/styles/liberty',
+                center: ${json.dumps(map_center)|n},
+                zoom: 16,
+            })
+
+            this.map.on('load', () => {
+
+                this.map.addSource('assetGeometry', {
+                    'type': 'geojson',
+                    'data': {
+                        'type': 'Feature',
+                        'geometry': {
+                            'type': 'Polygon',
+                            'coordinates': ${json.dumps(map_polygon)|n},
+                        }
+                    }
+                })
+
+                this.map.addLayer({
+                    'id': 'assetGeometry',
+                    'source': 'assetGeometry',
+                    'type': 'line',
+                    'paint': {
+                        'line-color': 'orange',
+                        'line-width': 2,
+                    },
+                })
+
+                this.map.fitBounds(${json.dumps(map_bounds)|n}, {
+                    linear: true,
+                })
+
+                this.map.addControl(new maplibregl.FullscreenControl())
+                this.map.addControl(new maplibregl.NavigationControl(), 'top-left')
+                this.map.addControl(new maplibregl.ScaleControl({
+                    maxWidth: 80,
+                    unit: 'imperial',
+                }))
+            })
+        }
+
+      </script>
+  % endif
 </%def>

src/wuttafarm/web/templates/base.mako

@@ -1,6 +1,16 @@
 <%inherit file="wuttaweb:templates/base.mako" />
 <%namespace file="/wuttafarm-components.mako" import="make_wuttafarm_components" />
 
+<%def name="head_tags()">
+  ${parent.head_tags()}
+
+  ## TODO: this likely does not belong in the base template, and should be
+  ## included per template where actually needed.  but this is easier for now.
+  <script src="https://unpkg.com/maplibre-gl@latest/dist/maplibre-gl.js"></script>
+  <link rel="stylesheet" href="https://unpkg.com/maplibre-gl@latest/dist/maplibre-gl.css" />
+
+</%def>
+
 <%def name="index_title_controls()">
   ${parent.index_title_controls()}
 

src/wuttafarm/web/views/assets.py

@@ -23,6 +23,7 @@
 Master view for Assets
 """
 
+import re
 from collections import OrderedDict
 
 from webhelpers2.html import tags
@@ -359,6 +360,36 @@ class AssetMasterView(WuttaFarmMasterView):
 
         return buttons
 
+    def get_template_context(self, context):
+        context = super().get_template_context(context)
+
+        if self.viewing:
+            asset = context["instance"]
+
+            # add location geometry if applicable
+            if asset.is_fixed and asset.farmos_uuid and not self.app.is_standalone():
+
+                # TODO: eventually sync GIS data, avoid this API call?
+                client = get_farmos_client_for_user(self.request)
+                result = client.asset.get_id(asset.asset_type, asset.farmos_uuid)
+                geometry = result["data"]["attributes"]["intrinsic_geometry"]
+
+                context["map_center"] = [geometry["lon"], geometry["lat"]]
+
+                context["map_bounds"] = [
+                    [geometry["left"], geometry["bottom"]],
+                    [geometry["right"], geometry["top"]],
+                ]
+
+                if match := re.match(
+                    r"^POLYGON \(\((?P<points>[^\)]+)\)\)$", geometry["value"]
+                ):
+                    points = match.group("points").split(", ")
+                    points = [[float(pt) for pt in pair.split(" ")] for pair in points]
+                    context["map_polygon"] = [points]
+
+        return context
+
     def get_version_joins(self):
         """
         We override this to declare the relationship between the