Create convertSvgToAssetCatalog.sh (#503)

This adds a bash script which can convert a list of SVG files from the input to a Xcode asset catalog containing PDF's. PDF's is iOS's standard vector format. This is very handy when you're an iOS developer and need to create e.g. a country picker.

convertSvgToAssetCatalog.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+usage() {
+  echo "$1"
+  echo "Usage: $0 <input_folder> <output_folder>"
+  echo "Quit..."
+}
+
+INPUT_FOLDER=$1
+OUTPUT_FOLDER=$2
+
+if [ -z "$INPUT_FOLDER" ]; then usage "Input Folder missing!"; exit 1; fi
+if [ -z "$OUTPUT_FOLDER" ]; then usage "Output Folder missing!"; exit 1; fi
+
+command -v rsvg-convert >/dev/null 2>&1 || { 
+  echo >&2 usage "RsvgConvert missing - Install using \"brew install librsvg\"."; exit 1;
+}
+
+SVG_LIST=($(ls $INPUT_FOLDER/*.svg))
+JSON="{\"images\":[{\"idiom\":\"universal\",\"filename\":\"##FILE_NAME##\"}],\"info\":{\"version\":1,\"author\":\"xcode\"},\"properties\":{\"preserves-vector-representation\":true}}"
+ASSET_FOLDER="/tmp/Assets.xcassets"
+
+
+rm -rf $ASSET_FOLDER
+
+for SVG in "${SVG_LIST[@]}"; do
+  ID=$(echo $(basename $SVG) | cut -d. -f1)
+  IMAGESET="$ASSET_FOLDER/$ID.imageset"
+
+  mkdir -p $IMAGESET
+  rsvg-convert -f pdf -o $IMAGESET/$ID.pdf $SVG
+  echo ${JSON/"##FILE_NAME##"/"$ID.pdf"} > "$IMAGESET/Contents.json"
+done
+
+mv $ASSET_FOLDER $OUTPUT_FOLDER