Module: Twin::Template

Defined in:
lib/twin/template.rb

Constant Summary collapse

PATTERN = 
/\{\{([^}]+)\}\}/
FIELDS =

Fields in a grubber record that may contain {tokens}.

%w[Source Target Path Target-Path Exclude Cmd].freeze

Class Method Summary collapse

Class Method Details

.render_file(path, vars, context:) ⇒ Object

Read a template file and substitute {tokens} in its content. Binary read preserves bytes exactly; raises on unknown token.



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# File 'lib/twin/template.rb', line 21

def render_file(path, vars, context:)
  substitute(File.binread(path), vars, context: context)
end

.substitute(value, vars, context:) ⇒ Object

Replace {token} in value using vars. Raises on unknown token.



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# File 'lib/twin/template.rb', line 11

def substitute(value, vars, context:)
  return value unless value.is_a?(String)
  value.gsub(PATTERN) do
    token = $1
    vars.fetch(token) { raise "unknown template token {{#{token}}} in #{context}" }
  end
end

.substitute_record(r, vars, context:) ⇒ Object

Return a copy of grubber record r with FIELDS substituted.



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# File 'lib/twin/template.rb', line 26

def substitute_record(r, vars, context:)
  return r if vars.empty?
  result = r.dup
  FIELDS.each do |field|
    next unless result.key?(field) && result[field].is_a?(String)
    result[field] = substitute(result[field], vars, context: context)
  end
  result
end