Class: InteractiveGrep::Grepper

Inherits:
Object
  • Object
show all
Defined in:
lib/interactive_grep/grepper.rb

Constant Summary collapse

DEFAULT_PATTERN = 
%r{.}.freeze
DEFAULT_PROGRESS_INDICATOR_COUNT =

in verbose mode, show signs of life after processing every N lines

100.freeze
DEBUG = 
false.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = nil) ⇒ Grepper

Returns a new instance of Grepper.



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# File 'lib/interactive_grep/grepper.rb', line 12

def initialize( options = nil )
  options ||= {}

  @progress_indicator_count = options[:progress_indicator_count] || DEFAULT_PROGRESS_INDICATOR_COUNT
  @verbose = options.has_key?("verbose") ? options[ "verbose" ] : DEBUG
  # puts "verbose: #{@verbose.inspect}"
  @mode = options[ "mode" ] || "normal"
  @gz = options[ "gz" ]
  @initial_pattern = !!options[ "pattern" ] ? %r{#{options[ "pattern" ]}} : DEFAULT_PATTERN
  @current_pattern = @initial_pattern
  reset_file_index
  @file_names = self.class.globs_to_files( options[ "files" ] )

  if !current_file || !File.exists?( current_file )
    raise "must specify at least one valid file (and/or file_glob)"
  end

  puts "using:\n\tfiles: #{file_names}\n\tending in: #{ending}\n\tinitial_pattern: #{current_pattern_string}\n" if verbose?
end

Instance Attribute Details

#file_names ⇒ Object (readonly)

Returns the value of attribute file_names.



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# File 'lib/interactive_grep/grepper.rb', line 9

def file_names
  @file_names
end

#initial_pattern ⇒ Object

Returns the value of attribute initial_pattern.



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# File 'lib/interactive_grep/grepper.rb', line 10

def initial_pattern
  @initial_pattern
end

#progress_indicator_count ⇒ Object

Returns the value of attribute progress_indicator_count.



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# File 'lib/interactive_grep/grepper.rb', line 10

def progress_indicator_count
  @progress_indicator_count
end

Class Method Details

.globs_to_files(files_or_globs) ⇒ Object 



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# File 'lib/interactive_grep/grepper.rb', line 32

def self.globs_to_files( files_or_globs )
  files_or_globs = files_or_globs.is_a?( Array ) ? files_or_globs : [ files_or_globs ]
  files_or_globs.map {|file_or_glob| Dir.glob( file_or_glob ) }.flatten
end

Instance Method Details

#current_file ⇒ Object 



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# File 'lib/interactive_grep/grepper.rb', line 53

def current_file
  file_names[ file_index ]
end

#current_pattern_string ⇒ Object 



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# File 'lib/interactive_grep/grepper.rb', line 41

def current_pattern_string
  default_pattern? ? "<match every line>" : current_pattern
end

#default_pattern? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/interactive_grep/grepper.rb', line 37

def default_pattern?
  DEFAULT_PATTERN == current_pattern
end

#ending ⇒ Object 



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# File 'lib/interactive_grep/grepper.rb', line 45

def ending
  File.extname( current_file )
end

#gz? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/interactive_grep/grepper.rb', line 49

def gz?
  @gz || ending[/.?gz$/]
end

#increment_file_index ⇒ Object 



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# File 'lib/interactive_grep/grepper.rb', line 61

def increment_file_index
  @file_index += 1
end

#matches?(_line, _pattern) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/interactive_grep/grepper.rb', line 65

def matches?(_line, _pattern)
  return _line =~ _pattern
rescue ArgumentError
  return false
end

#reset_file_index ⇒ Object 



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# File 'lib/interactive_grep/grepper.rb', line 57

def reset_file_index
  @file_index = 0
end

#run ⇒ Object 



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# File 'lib/interactive_grep/grepper.rb', line 71

def run
  counter = 0
  results = []
  @current_pattern = initial_pattern
  while line = next_line
    # if line[@current_pattern]
    if matches?(line, @current_pattern)
      line.strip!
      counter += 1
      unless just_count? || ( verbose? && interactive? )
        results << line
      end
      @current_pattern = prompt( line )
    end
    puts "." if verbose? && 0 == (counter % progress_indicator_count)
  end
  reset_file_index
  puts "no more files.\n" if verbose?
  if just_count?
    puts "matched #{counter} line(s)\ndone.\n"
    counter
  else
    puts "done.\n" if verbose?
    results
  end
end