Added nodejs code generator. (#1)

docker/scripts/codegen.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+platform=$1
+apptype=$2
+projname=$3
+
+templates_dir="/code-templates"
+placeholder="_projname_"
+output_dir=$CODEGEN_OUTPUT
+usage="Usage: <platform> <app type> <project name>"
+
+if [ -z $templates_dir ] || [ -z $output_dir ] ; then
+    echo "Mandatory values missing." && exit 1
+fi
+
+[ -z $platform ] && echo "Platform is required. $usage" && exit 1
+[ -z $apptype ] && echo "App type is required. $usage" && exit 1
+[ -z $projname ] && echo "Project name is required. $usage" && exit 1
+
+[ ! -d $templates_dir/$platform ] && echo "Invalid platform '$platform' specified." && exit 1
+[ ! -d $templates_dir/$platform/$apptype ] && echo "Invalid application type '$apptype' specified." && exit 1
+if ! [[ "$projname" =~ ^[a-z][a-z0-9_-]*$ ]]; then
+  echo "Invalid project name. Must be lowercase. Must start with a letter. Can only contain letters, numbers, dash and underscore."
+  exit 1
+fi
+
+mkdir -p $output_dir && rm -rf $output_dir/*
+cp -r $templates_dir/$platform/$apptype/* $output_dir
+
+pushd $output_dir > /dev/null
+
+# Replace placeholder in all file contents.
+find -type f -exec sed -i "s/${placeholder}/${projname}/g" {} \;
+
+# Rename files with placeholder name.
+for f in $(find -type f -name "*${placeholder}*")
+do
+    mv "$f" "$(echo "$f" | sed s/${placeholder}/${projname}/g)"
+done
+
+popd > /dev/null