Class: Cassava::Main

Inherits:
Object
  • Object
show all
Defined in:
lib/cassava/main.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args = nil) ⇒ Main

Returns a new instance of Main.



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# File 'lib/cassava/main.rb', line 11

def initialize args = nil
  @progname = File.basename($0)
  @args = (args || ARGV).dup
  @opts = { }
  @exit_code = 0
  @output = "/dev/stdout"
  @debug = true
  @select_where = { }
end

Instance Attribute Details

#args ⇒ Object

Returns the value of attribute args.



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# File 'lib/cassava/main.rb', line 7

def args
  @args
end

#by ⇒ Object

Returns the value of attribute by.



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# File 'lib/cassava/main.rb', line 9

def by
  @by
end

#cmd ⇒ Object

Returns the value of attribute cmd.



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# File 'lib/cassava/main.rb', line 7

def cmd
  @cmd
end

#columns ⇒ Object

Returns the value of attribute columns.



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# File 'lib/cassava/main.rb', line 9

def columns
  @columns
end

#exit_code ⇒ Object

Returns the value of attribute exit_code.



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# File 'lib/cassava/main.rb', line 7

def exit_code
  @exit_code
end

#opts ⇒ Object

Returns the value of attribute opts.



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# File 'lib/cassava/main.rb', line 7

def opts
  @opts
end

#output ⇒ Object

Returns the value of attribute output.



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# File 'lib/cassava/main.rb', line 8

def output
  @output
end

#progname ⇒ Object

Returns the value of attribute progname.



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# File 'lib/cassava/main.rb', line 6

def progname
  @progname
end

#result ⇒ Object

Returns the value of attribute result.



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# File 'lib/cassava/main.rb', line 8

def result
  @result
end

Class Method Details

.define_command(name, doc, &blk) ⇒ Object 



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# File 'lib/cassava/main.rb', line 107

def self.define_command name, doc, &blk
  meth = :"_#{name}!"
  define_method meth, &blk
  @@commands << { :name => name, :doc => doc }
end

Instance Method Details

#_cat! ⇒ Object 



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# File 'lib/cassava/main.rb', line 113

def _cat!
  self.result = next_document!
  until args.empty?
    other = next_document!
    result.append_rows!(other)
  end
end

#_cut! ⇒ Object 



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# File 'lib/cassava/main.rb', line 136

def _cut!
  self.columns = nil
  self.result = next_document!
  self.columns ||= [ result.columns[0] ]
  # pp result.columns
  result.to_column_names! columns
  new_result = result.dup.empty_rows!
  new_result.columns = columns & result.columns
  # pp new_result.columns
  # pp new_result.column_offset
  rows = self.result.rows.map do | r |
    r = r.dup
    r.keep_if { | c | new_result.column_offset[c] }
    # pp r
    r
  end
  new_result.append_rows! rows
  self.result = new_result
end

#_format! ⇒ Object 



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# File 'lib/cassava/main.rb', line 191

def _format!
  rows = result.to_text
  # $stderr.puts rows
  rows = rows.split("\n").map { | r | { :_ => r } }
  # require 'pp'; pp rows
  self.result = Cassava::Document.new(:name => "#{@result.name}->format", :columns => [ :_ ], :rows => rows)
end

#_join! ⇒ Object 



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# File 'lib/cassava/main.rb', line 156

def _join!
  self.result = next_document!
  until args.empty?
    left_key = args.shift.to_sym
    right_key = args.shift.to_sym
    right = next_document!
    new_result = Document.new
    result.columns.each do | c |
      new_result.add_column!(c)
    end
    right.columns.each do | c |
      new_result.add_column!(c)
    end
    result.rows.each do | lr |
      rrows = right.get(right_key, lr[left_key])
      unless rrows.empty?
        r = lr.dup
        rrows.each do | rr |
          r.merge(rr)
        end
        new_result.rows << r
      end
    end
    self.result = new_result
  end
end

#_sort! ⇒ Object 



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# File 'lib/cassava/main.rb', line 183

def _sort!
  self.by = nil
  self.result = next_document!
  by = self.by || args
  by.map! { | c | c.to_sym }
  result.sort!(by)
end

#_where! ⇒ Object Also known as: _select! 



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# File 'lib/cassava/main.rb', line 121

def _where!
  @select_where = { }
  self.result = next_document!
  result.coerce_to_strings!
  @select_where.each do | col, val |
    new_result = result.dup
    new_result.empty_rows!
    found_rows = result.get(col, val)
    # puts "  #{col}=#{val} => #{found_rows.size} rows"
    new_result.append_rows!(found_rows)
    self.result = new_result
  end
end

#next_cmd! ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/cassava/main.rb', line 62

def next_cmd!
  @cmd = @args.shift
  sel = :"_#{cmd}!"
  raise ArgumentError, "Invalid command: #{cmd.inspect}" unless respond_to?(sel)
  send(sel)
end

#next_document! ⇒ Object 



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# File 'lib/cassava/main.rb', line 69

def next_document!
  doc = nil
  opts = { }
  until args.empty?
    case arg = args.shift
    when '-cv'
      k = args.shift.to_sym
      v = args.shift
      @select_where[k] = v
    when /\A([^=]+)=(.*)\Z/
      k = $1.to_sym
      v = $2
      @select_where[k] = v
    when '--result'
      doc = @result
      break
    when '-c'
      self.columns = args.shift.split(/\s*,\s*|\s+/)
    when '-by'
      self.by = args.shift.split(/\s*,\s*|\s+/)
    when '-o'
      self.output = args.shift
    when '-FS'
      opts[:col_sep] = args.shift
    when '-IGNORE'
      opts[:ignore] = args.shift
    when '-C'
      opts[:columns] = args.shift.split(/\s*,\s*|\s+/)
    else
      opts[:name] = arg
      doc = Document.new(opts)
      doc.parse!
      break
    end
  end
  doc
end

#run! ⇒ Object 



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# File 'lib/cassava/main.rb', line 21

def run!
  cmds = [ ]
  last_arg = nil

  cmd = [ ]
  args = @args.dup
  while arg = args.shift
    if arg == '-'
      if last_arg
        cmd << last_arg
        last_arg = nil
      end
      last_arg = '--result'
      cmds << cmd
      cmd = [ ]
    else
      cmd << arg
    end
  end
  if last_arg
    cmd << last_arg
    last_arg = nil
  end
  cmds << cmd
  # pp cmds

  # Run each command:
  cmds.each do | cmd |
    @args = cmd.dup
    next_cmd!
  end

  result.emit!(@output) if result
  self
rescue ::Exception => exc
  $stderr.puts "#{progname}: ERROR: #{exc.inspect}"
  $stderr.puts "  #{exc.backtrace * "\n  "}" if @debug || $DEBUG
  @exit_code = 1
  self
end