parse_yaml.sh

# originally courtesy of https://gist.github.com/pkuczynski/8665367
# note: only supports 2 space indented YAML.
# additions:
# - only set environment variable if not already set
# - uppercase parsed variables to avoid case sensitivity
parse_yaml() {
   local prefix=$2
   local s='[[:space:]]*' w='[a-zA-Z0-9_]*' fs=$(echo @|tr @ '\034')
   sed -ne "s|^\($s\)\($w\)$s:$s\"\(.*\)\"$s\$|\1$fs\2$fs\3|p" \
        -e "s|^\($s\)\($w\)$s:$s\(.*\)$s\$|\1$fs\2$fs\3|p"  $1 |
   awk -F$fs '{
      indent = length($1)/2;
      vname[indent] = $2;
      for (i in vname) {if (i > indent) {delete vname[i]}}
      if (length($3) > 0) {
         vn=""; for (i=0; i<indent; i++) {vn=(vn)(vname[i])("_")}
         printf("test \"$%s%s\" != \"\" || export %s%s=\"%s\"; ", toupper(vn), toupper($2), toupper(vn), toupper($2), $3);
      }
   }'
}