107 lines
2.2 KiB
Crystal
107 lines
2.2 KiB
Crystal
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require "crinja"
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def sanitize_path(path)
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path.gsub /\/\/+/, "/"
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end
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module Configure
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def self.parse_options(unparsed : Array(String))
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options = ARGV.map(&.split '=')
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hash = Hash(String, String | Array(String) | Crinja::Callable::Instance | Hash(String, String)).new
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options.each do |entry|
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key, value = entry
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old_value = hash[key]?
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case old_value
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when nil
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hash[key] = value
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when String
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hash[key] = [old_value, value]
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when Array(String)
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old_value << value
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end
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end
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hash
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end
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end
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class Configure::Exception < Exception
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end
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class Configure::Context
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getter root : String
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def initialize(@root)
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end
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def generate(template, target : String, options : Hash(String, String | Array(String) | Crinja::Callable::Instance | Hash(String, String)))
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target_file = File.open target, "w"
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# FIXME: Alter default sources at build-time.
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# FIXME: We’ll want a way to alter those context-wide.
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sources = [
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"/etc/templates",
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"/usr/share/templates"
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]
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sources = sources
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.map(&.+("/#{template}.j2"))
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.map { |x| sanitize_path x }
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source = sources.find do |source|
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if File.exists? source
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puts "Generating '#{target}' from '#{source}'"
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next true
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end
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end
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unless source
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raise Exception.new "Could not find template to generate file ('#{target}')."
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end
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options["id"] = ENV["SERVICE_ID"]? || ""
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options["environment"] = ENV["ENVIRONMENT"]? || ""
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options["port"] = Crinja.function do
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service = (arguments.varargs[0]? || "").to_s.gsub /\//, ':'
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`get-port #{service}`
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end
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providers = {} of String => String
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ENV["SERVICE_TOKENS"].try &.split(':').each do |token|
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providers[token] = ENV["#{token.upcase}_PROVIDER"]? || ""
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end
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options["providers"] = providers
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template = File.read source
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target_file << Crinja.render(template, options)
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target_file.close
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end
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end
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template = ARGV[0]?
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target = ARGV[1]?
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if target.nil?
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puts "usage: configure <template-name> <target> [option1=value1 [option2=value2 […]]]"
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exit 1
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end
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ARGV.shift
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ARGV.shift
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options = Configure.parse_options ARGV
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begin
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Configure::Context.new("/").generate(template, target, options)
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rescue e : Configure::Exception
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STDERR.puts "Fatal error: #{e.message}"
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exit 1
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end
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