Merge pull request #18 from unacast/geojson2csv

Add an action for geojson2csv

geojson2csv/Dockerfile

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+FROM python:3.7-alpine
+
+LABEL "name"="geojson2csv"
+LABEL "maintainer"="Unacast <developers+github@unacast.com>"
+LABEL "version"="1.0.0"
+
+LABEL "com.github.actions.name"="Geojson2csv"
+LABEL "com.github.actions.description"="Convert geojson to csv"
+LABEL "com.github.actions.icon"="truck"
+LABEL "com.github.actions.color"="green"
+
+RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories
+
+RUN apk add --no-cache \
+gcc \
+libc-dev \
+geos-dev \
+curl
+
+RUN pip install geojson shapely
+
+COPY geojson2csv.py /usr/bin/geojson2csv
+RUN chmod +x /usr/bin/geojson2csv
+
+CMD ["geojson2csv", "-h"]

geojson2csv/README.md

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+# geojson2csv
+Github Action for tansforming geojson FeatureCollections to CSVs with WKT geometry. 
+
+## Usage
+
+## Example Workflow file
+
+An example workflow to transform a geojson in the repository
+
+```
+workflow "Deploy geometries" {
+  on = "deployment"
+  resolves = "Transform to csv"
+}
+
+action "Transform to csv" {
+  uses = "unacast/actions/geojson2csv@master"
+  runs = "geojson2csv"
+  args = "input.geojson output.csv"
+}
+```

geojson2csv/geojson2csv.py

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+#!/usr/bin/env python
+import argparse
+import csv
+import json
+import sys
+import geojson
+from shapely.geometry import shape
+
+def parse_geojson(infile, outfile, geometry_column_name):
+    with open(infile, 'r') as geojsonfile:
+        input_geojson = geojson.load(geojsonfile)
+
+    records = []
+    for elm in input_geojson.features:
+        geom = shape(elm['geometry']).wkt
+        geom = {geometry_column_name: geom}
+        prop = elm['properties']
+        prop.update(geom)
+        records.append(prop)
+
+    with open(outfile, 'w') as csvfile:
+        fieldnames = records[0].keys()
+        writer = csv.DictWriter(csvfile, fieldnames)
+
+        writer.writeheader()
+        writer.writerows(records)
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description='Convert geojson to csv with WKT geometries.')
+    parser.add_argument('infile', help="Input geojson file name")
+    parser.add_argument('outfile', help="Output csv file name")
+    parser.add_argument('--colname', default='geometry', help="Geometry column name")
+    args = parser.parse_args()
+
+    parse_geojson(args.infile, args.outfile, args.colname)