def layer_summary(layer_id: str, layer: QgsMapLayer):
return dict(
id=layer_id,
name=layer.name(),
source=layer.publicSource(),
crs=layer.crs().userFriendlyIdentifier(),
valid=layer.isValid(),
spatial=layer.isSpatial(),
)
def add_layer_metadata(map_layer: qgc.QgsMapLayer, layer_cfg: Layer) -> None:
"""Add layer metadata.
Renders a jinja template to a temporary file location as a valid QGIS qmd
metadata file. This metadata then gets associated with the `map_layer` using
its `loadNamedMetadata` method. This metadata gets written to the project
file when the layer is added to the `project`.
"""
qmd_template = load_template('metadata.jinja')
# Set the layer's tooltip
tooltip = _build_layer_tooltip(layer_cfg)
map_layer.setAbstract(tooltip)
# Render the qmd template.
abstract = escape(build_layer_metadata(layer_cfg))
layer_extent = map_layer.extent()
layer_crs = map_layer.crs()
if layer_cfg.steps:
provenance_list = [escape(step.provenance) for step in layer_cfg.steps]
else:
provenance_list = []
rendered_qmd = qmd_template.render(
provenance_list=provenance_list,
abstract=abstract,
title=layer_cfg.title,
crs_proj4_str=layer_crs.toProj4(),
crs_srsid=layer_crs.srsid(),
crs_postgres_srid=layer_crs.postgisSrid(),
crs_authid=layer_crs.authid(),
crs_description=layer_crs.description(),
crs_projection_acronym=layer_crs.projectionAcronym(),
crs_ellipsoid_acronym=layer_crs.ellipsoidAcronym(),
minx=layer_extent.xMinimum(),
miny=layer_extent.yMinimum(),
maxx=layer_extent.xMaximum(),
maxy=layer_extent.yMaximum(),
)
# Write the rendered tempalte to a temporary file
# location. `map_layer.loadNamedMetadata` expects a string URI corresponding
# to a file on disk.
with tempfile.NamedTemporaryFile('w') as temp_file:
temp_file.write(rendered_qmd)
temp_file.flush()
map_layer.loadNamedMetadata(temp_file.name)
