Class: Masticate::MyOptionParser

Inherits:
Object
  • Object
show all
Defined in:
lib/masticate/myoptparse.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ MyOptionParser

Returns a new instance of MyOptionParser.



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# File 'lib/masticate/myoptparse.rb', line 6

def initialize
  @options = {}
  @parser = OptionParser.new do |opts|
    opts.banner = "Usage: masticate [command] [options]"

    opts.on("--output FILENAME", String, "Redirect output from stdout to file") do |f|
      @options[:output] = f
    end

    opts.on("--format FORMAT", String, "Specify format") do |v|
      @options[:format] = v
    end

    opts.on("--delim DELIMITER", String, "Specify field delimiter (character or TAB; default is ',')") do |v|
      @options[:col_sep] = v
      @options[:col_sep] = "\t" if @options[:col_sep] == "TAB"
    end

    opts.on("--quote QUOTE-CHAR", String, "Specify character used for quoting fields (optional; default is no quoting)") do |char|
      @options[:quote_char] = char
    end

    opts.on("--stats", "(for *sniff*) collect & display input stats") do
      @options[:stats] = true
    end

    opts.on("--fields LIST", Array, "Specify fields to select") do |list|
      @options[:fields] = list
    end

    opts.on("--field FIELD", String, "Specify field to convert") do |f|
      @options[:field] = f
    end

    # if I specify String here, then a blank string '' is considered invalid and triggers an exception.
    opts.on("--value VALUE", "(*exclude* only) Value to compare field to for exclusion") do |s|
      @options[:value] = s
    end

    opts.on("--snip DIRECTIVE", String, "Specify header fields to snip: first N, or by name") do |f|
      @options[:snip] = f.to_i
    end

    opts.on("--from REGEXP", String, "Regular expression for gsub conversion") do |s|
      @options[:from] = s
    end

    # if I specify String here, then a blank string '' is considered invalid and triggers an exception.
    opts.on("--to STRING", "Result string for gsub conversion") do |s|
      @options[:to] = s
    end

    opts.on("--inlined", "(for *mend* only) Source file has headers inlined on each line") do |b|
      @options[:inlined] = true
    end

    opts.on("--dejunk", "(for *mend* only) Expunge junk lines from source") do |b|
      @options[:dejunk] = true
    end

    opts.on("--by FIELD", String, "(for *maxrows* only) Field to group by") do |f|
      @options[:by] = f
    end

    opts.on("--max FIELD", String, "(for *maxrows* only) Field to find max value for") do |f|
      @options[:max] = f
    end

    opts.on("--recipe FILENAME", String, "(*cook* only) Recipe file") do |f|
      @options[:recipe] = f
    end

    opts.on("--rule {downcase,upcase}", String, "(*transform* only) Transformation rule") do |f|
      @options[:rule] = f
    end

    opts.on("--buried FIELD", String, "(*mend* only) Remove embedded delimiters from named field") do |f|
      @options[:buried] = f
    end
  end
end

Instance Attribute Details

#command ⇒ Object (readonly)

Returns the value of attribute command.



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# File 'lib/masticate/myoptparse.rb', line 4

def command
  @command
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/masticate/myoptparse.rb', line 4

def options
  @options
end

Instance Method Details

#execute(command, options, filenames = nil) ⇒ Object 



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# File 'lib/masticate/myoptparse.rb', line 112

def execute(command, options, filenames = nil)
  filename = filenames.first

  case command
  when 'sniff'
    results = Masticate.sniff(filename, options)
    col_sep = results[:col_sep]
    col_sep = "TAB" if col_sep == "\t"
    quote_char = results[:quote_char] || "NONE"
    $stderr.puts <<-EOT
Processing complete.
Input delimiter: #{col_sep}
Quote char: #{quote_char}
Field counts: #{results[:field_counts].inspect}
Headers: #{results[:headers].join(',')}
EOT

  when 'mend'
    results = Masticate.mend(filename, options)
    logmessage(command, options, results)

  when 'csvify'
    results = Masticate.csvify(filename, options)
    logmessage(command, options, results)

  when 'pluck'
    results = Masticate.pluck(filename, options)
    logmessage(command, options, results)

  when 'datify'
    results = Masticate.datify(filename, options)
    logmessage(command, options, results)

  when 'gsub'
    results = Masticate.gsub(filename, options)
    logmessage(command, options, results)

  when 'maxrows'
    results = Masticate.maxrows(filename, options)
    logmessage(command, options, results)

  when 'concat'
    results = Masticate.concat(ARGV, options)
    # logmessage(command, options, results)

  when 'relabel'
    results = Masticate.relabel(filename, options)
    # logmessage(command, options, results)

  when 'cook'
    results = Masticate.cook(filename, options)
    logmessage(command, options, results)

  when 'exclude'
    results = Masticate.exclude(filename, options)
    logmessage(command, options, results)

  when 'include'
    results = Masticate.include(filename, options)
    logmessage(command, options, results)

  when 'transform'
    results = Masticate.transform(filename, options)
    logmessage(command, options, results)

  else
    raise "unknown command #{command}"
  end
end

#logmessage(command, options, results) ⇒ Object 



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# File 'lib/masticate/myoptparse.rb', line 182

def logmessage(command, options, results)
  $stderr.puts <<-EOT
* masticate #{command} (#{options.keys.join(', ')})
Lines in input: #{results[:input_count]}
Lines in output: #{results[:output_count]}
Headers: #{results[:headers].inspect}
EOT
  if results[:field_counts]
    $stderr.puts "  Field counts: #{results[:field_counts].inspect}"
  end
end

#parse(argv = ARGV) ⇒ Object 



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# File 'lib/masticate/myoptparse.rb', line 88

def parse(argv = ARGV)
  @command = argv.shift
  filenames = @parser.parse(argv)
  # argv remnants are filenames
  [@command, @options, filenames]
end

#prepare(command, options) ⇒ Object 



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# File 'lib/masticate/myoptparse.rb', line 95

def prepare(command, options)
  klasses = {
    'gsub' => Masticate::Gsubber,
    'transform' => Masticate::Transform,
    'datify' => Masticate::Datify,
    'maxrows' => Masticate::MaxRows,
    'relabel' => Masticate::Relabel,
    'pluck' => Masticate::Plucker,
    'exclude' => Masticate::Exclude,
    'include' => Masticate::Include,
    'mend' => Masticate::Mender
  }

  klass = klasses[command]
  klass.new(options)
end