lf

lf is a lightweight command-line LTSV processor.

Installation

Install it yourself as:

$ gem install lf

Usage

$ lf -h
Usage: lf [options] <filters ...> [file]
    -r, --require FILE               Require a file
    -c, --[no-]color                 Colored output
    -f, --format FORMAT              Choose a format(ltsv, table)
    -b, --[no-]buffered              Flush the output after each LTSV row
    -h, --help                       Show this message
    -v, --version                    Show version

Input

Specify LTSV file path:

$ lf example.ltsv

Or input via pipe:

$ tail -f example.ltsv | lf

Filters

You can set filters to lf: filter-name:args

$ lf label:tag1,foo example.ltsv
tag1:test   foo:bar
$ lf label:tag1 example.ltsv
tag1:test

Label filter

label:select labels(comma separated)

$ lf label:tag1,foo example.ltsv
tag1:test   foo:bar
tag1:test   foo:baz
$ lf label:tag1 example.ltsv
tag1:test
tag1:test

Ignore filter

ignore:ignore labels(comma separated)

$ lf ignore:tag1 example.ltsv
foo:bar test:key    long:long long long message long long long label:short
foo:baz test:key    long:long long long message long long long label:short

Equal filter

equal:label:value

$ lf eq:foo:bar example.ltsv
tag1:test   foo:bar test:key    long:long long long message long long long label:short

Regexp filter

regexp:label:regexp

$ lf reg:foo:r$ example.ltsv
tag1:test   foo:bar test:key    long:long long long message long long long label:short

Customu filter

Make your custom filters:

# custom-filter.rb
class StatusCode < Lf::Filter
    filter_alias :status

  def initialize(status_code)
    @status_code = status_code.to_i
  end

  def apply(row)
        row[:status].to_i == @status_code ? row : nil
  end
end

$ lf --require custom-filter.rb status:200 nginx.log

Contributing

1. Fork it ( https://github.com/rosylilly/lf/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request