# Copyright (C) 2011-2012 Tanaka Akira  <akr@fsij.org>
#
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Tb::Cmd.subcommands << 'search'

Tb::Cmd.default_option[:opt_search_e] = nil
Tb::Cmd.default_option[:opt_search_ruby] = nil
Tb::Cmd.default_option[:opt_search_f] = nil
Tb::Cmd.default_option[:opt_search_v] = nil

def (Tb::Cmd).op_search
  op = OptionParser.new
  op.banner = "Usage: tb search [OPTS] REGEXP [TABLE ...]\n" +
    "Search rows using regexp or ruby expression."
  define_common_option(op, "hNo", "--no-pager")
  op.def_option('-f FIELD', 'search field') {|field| Tb::Cmd.opt_search_f = field }
  op.def_option('-e REGEXP', 'specify a regexp.') {|pattern| Tb::Cmd.opt_search_e = pattern }
  op.def_option('--ruby RUBY-EXP', 'predicate written in ruby.  A hash is given as _.  no usual regexp argument.') {|ruby_exp| Tb::Cmd.opt_search_ruby = ruby_exp }
  op.def_option('-v', 'ouput the records which doesn\'t match') { Tb::Cmd.opt_search_v = true }
  op
end

Tb::Cmd.def_vhelp('search', <<'End')
Example:

  % cat tst.csv
  a,b,c
  0,1,2
  4,5,6
  % tb search 0 tst.csv
  a,b,c
  0,1,2
End

def (Tb::Cmd).main_search(argv)
  op_search.parse!(argv)
  exit_if_help('search')
  if Tb::Cmd.opt_search_ruby
    pred = eval("lambda {|_| #{Tb::Cmd.opt_search_ruby} }")
  elsif Tb::Cmd.opt_search_e
    re = Regexp.new(Tb::Cmd.opt_search_e)
    pred = Tb::Cmd.opt_search_f ?
      lambda {|_| re =~ _[Tb::Cmd.opt_search_f] } :
      lambda {|_| _.any? {|k, v| re =~ v.to_s } }
  else
    err("no regexp given.") if argv.empty?
    re = Regexp.new(argv.shift)
    pred = Tb::Cmd.opt_search_f ?
      lambda {|_| re =~ _[Tb::Cmd.opt_search_f] } :
      lambda {|_| _.any? {|k, v| re =~ v.to_s } }
  end
  opt_v = Tb::Cmd.opt_search_v ? true : false
  argv = ['-'] if argv.empty?
  creader = Tb::CatReader.open(argv, Tb::Cmd.opt_N)
  er = Tb::Enumerator.new {|y|
    header = nil
    creader.with_header {|header0|
      header = header0
      y.set_header header
    }.each {|pairs|
      h = {}
      pairs.each {|f, v|
        h[f] = v
      }
      found = pred.call(h)
      found = opt_v ^ !!(found)
      if found
        y.yield pairs
      end
    }
  }
  output_tbenum(er)
end

