Update vim's ":help compatible" table from source code extract

update_table

#!/bin/bash -eu
table_to_update=./compatible_table
source_extract=./option_extract

function get_decorated_options {
  # option_extract > while read -r option;
  while read -r line; do
    name=$(printf %s "$line" | sed -rn 's/^\s*\{\s*"(\w+).*/\1/p')

    # Get decoration
    if [[ $line =~ 'P_VI_DEF' ]]; then
      if [[ $line =~ 'P_VIM' ]]; then
        decoration='+'
      else
        decoration='XXXXXX' # Shouldn't happen, means bad input
      fi
    elif [[ $line =~ 'P_VIM' ]]; then
      decoration='\*' # Prevent shell expansion in 'set'
    else
      decoration='-'
    fi

    printf '%s '%s'\n' "$name" "$decoration"
  done < "$source_extract"
}

# Clear out the current character flag column to check for options
# which should not be listed - an 'X' in final output
sed -r "s/^(\s*'\w+'\t+)[-+* ]/\\1X/" -i "$table_to_update"

# Process list of <option> <decoration>
get_decorated_options |
while read -r decorated_option; do
  set $decorated_option # shellcheck disable=SC2086
  name="$1"; decoration="$2"

  # Add missing entries to table
  # grep -q "'$name'" "$table_to_update"
  # if [[ ! $? ]]; then
  if ! grep -q "'$name'" "$table_to_update"; then
    printf "\t'%s'\t  \t\t\n" "$name" >> "$table_to_update"
  fi

  sed -r "s/^(\s*'$name'\t+)[-+* X]/\\1$decoration/" -i "$table_to_update"
done

sort -o "$table_to_update" "$table_to_update"