generate-bindings: allow to use local files

shacl2code needs to download the following URLs during build time:
 - https://spdx.org/rdf/3.0.1/spdx-model.ttl
 - https://spdx.org/rdf/3.0.1/spdx-json-serialize-annotations.ttl
 - https://spdx.org/rdf/3.0.1/spdx-context.jsonld

There are a lot of package build tools that do not allow to download
a file during the build. So provide a way to use local file:
If the environment variable SHACL2CODE_SPDX_DIR is defined, load
the SPDX model and SPDX context from the directory specified by this
environment variable.

Signed-off-by: Benjamin Robin <benjamin.robin@bootlin.com>

Author: benjarobin

gen/generate-bindings

@@ -14,12 +14,22 @@ echo "# Import all versions" > __init__.py
 for v in $SPDX_VERSIONS; do
     MODNAME="v$(echo "$v" | sed 's/[^a-zA-Z0-9_]/_/g')"
 
-    shacl2code generate --input https://spdx.org/rdf/$v/spdx-model.ttl \
-        --input https://spdx.org/rdf/$v/spdx-json-serialize-annotations.ttl \
-        --context https://spdx.org/rdf/$v/spdx-context.jsonld \
-        --license Apache-2.0 \
-        python \
-        -o "$MODNAME.py"
+    if [ -n "${SHACL2CODE_SPDX_DIR}" ] && [ -d "${SHACL2CODE_SPDX_DIR}/$v" ]
+    then
+        shacl2code generate --input "file://${SHACL2CODE_SPDX_DIR}/$v/spdx-model.ttl" \
+            --input "file://${SHACL2CODE_SPDX_DIR}/$v/spdx-json-serialize-annotations.ttl" \
+            --context-url "file://${SHACL2CODE_SPDX_DIR}/$v/spdx-context.jsonld" https://spdx.org/rdf/$v/spdx-context.jsonld  \
+            --license Apache-2.0 \
+            python \
+            -o "$MODNAME.py"
+    else
+        shacl2code generate --input https://spdx.org/rdf/$v/spdx-model.ttl \
+            --input https://spdx.org/rdf/$v/spdx-json-serialize-annotations.ttl \
+            --context https://spdx.org/rdf/$v/spdx-context.jsonld \
+            --license Apache-2.0 \
+            python \
+            -o "$MODNAME.py"
+    fi
 
     echo "from . import $MODNAME" >> __init__.py
 done