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pyqgis_metadata.py

#pyqgis script to retrieve metadata of layer in directory

import os
import csv

FOLDER = '/home/jd'
RESULT = '/home/jd/metadata.csv'

def scan_directory(directory, extension=('.tab', '.shp', '.gpkg')):
    """return the list of files that matche the extension

    Args:
        directory (str): the folder to scan
        extension (tuple, optional): the extension. Defaults to ('.tab', '.shp', '.gpkg').
    """
    extension = tuple(map(str.lower, extension))
    for root, dirs, files in os.walk(directory, topdown=False):
        for filename in files:
            if filename.lower().endswith(extension):
                yield(root, filename, os.path.join(root, filename))

def get_metadata(layer):
    """Return metadata

    Args:
        layer ([ogr vectorlayer]): [Not sublayer]

    Returns:
        metadata: (name, comment, encoding....)
    """
    name = layer.name()
    comment = layer.dataComment()
    encoding = layer.dataProvider().encoding()
    datasource = layer.publicSource()
    feature_count = layer.featureCount()
    geom_type = geom_wkbtype = crs   =extent = None
    if layer.isSpatial():
        geom_type = layer.geometryType()
        if geom_type <0 or geom_type > QgsWkbTypes.NullGeometry:
            print(f'{layer} invalid geometry type')
        else:
            geom_wkbtype = QgsWkbTypes.displayString(layer.wkbType())
            geom_type = QgsWkbTypes.geometryDisplayString(geom_type)
        if layer.crs().isValid():
            crs = layer.crs().userFriendlyIdentifier(
                QgsCoordinateReferenceSystem.FullString )
        extent=layer.extent().toString()
    return (name, comment, encoding, geom_type, 
        geom_wkbtype, crs, extent, feature_count, datasource)
    

with open(RESULT, 'w', newline='') as myfile:
    wr = csv.writer(myfile, quoting=csv.QUOTE_ALL)
    wr.writerow(['name', 'comment', 'encoding',
        'geom_type', 'geom_wkbtype', 'crs', 'extent', 'feature_count','datasource'])
    
    for root, filename, path in scan_directory(FOLDER):
        layer = QgsVectorLayer(path, filename,'ogr')
        if not layer.isValid():
            print(f'{layer.name()} is not valid')
            continue
        wr.writerow(get_metadata(layer))