Inject some more variables into metadata

build.sh

@@ -8,7 +8,7 @@ SCRIPTPATH=`dirname $SCRIPT`
 ADDITIONAL_ARGS=${@:2}
 
 INPUT_FILE=`realpath $1`
-INPUT_DIR=`dirname $INPUT_FILE`
+export INPUT_DIR=`dirname $INPUT_FILE`
 METADATA_FILE="$INPUT_DIR/metadata.yaml"
 export OUTPUT_FILE="$PWD/output.pdf"
 

variables.lua

@@ -19,7 +19,11 @@ end
 
 return {
     {
-        Meta = getVars
+        Meta = function (meta)
+            meta = getVars(meta)
+            meta['outputFile'] = os.getenv("OUTPUT_FILE")
+            meta['inputDir'] = os.getenv("INPUT_DIR")
+        end
     },
     {
         Str = function (el)