<tool id="random_lines1" name="Select random lines" version="2.0.1">
  <description>from a file</description>
  <command interpreter="python">random_lines_two_pass.py "${input}" "${out_file1}" "${num_lines}"
  #if str( $seed_source.seed_source_selector ) == "set_seed":
      --seed "${seed_source.seed}"
  #end if
  </command>
  <inputs>
    <param name="num_lines" size="5" type="integer" value="1" label="Randomly select" help="lines"/>
    <param format="txt" name="input" type="data" label="from"/>
    <conditional name="seed_source">
      <param name="seed_source_selector" type="select" label="Set a random seed">
        <option value="no_seed" selected="True">Don't set seed</option>
        <option value="set_seed">Set seed</option>
      </param>
      <when value="no_seed">
        <!-- Do nothing here -->
      </when>
      <when value="set_seed"> 
        <param name="seed" type="text" label="Random seed" />
      </when>
    </conditional>
  </inputs>
  <outputs>
    <data format="input" name="out_file1" metadata_source="input"/>
  </outputs>
  <tests>
    <test>
      <param name="num_lines" value="65"/>
      <param name="input" value="1.bed"/>
      <param name="seed_source_selector" value="no_seed"/>
      <output name="out_file1" file="1.bed"/>
    </test>
    <test>
      <param name="num_lines" value="1"/>
      <param name="input" value="1.bed"/>
      <param name="seed_source_selector" value="set_seed"/>
      <param name="seed" value="asdf"/>
      <output name="out_file1" file="1_bed_random_lines_1_seed_asdf_out.bed"/>
    </test>
  </tests>
  <help>

**What it does**

This tool selects N random lines from a file, with no repeats, and preserving ordering.

-----

**Example**

Input File::

    chr7  56632  56652   D17003_CTCF_R6  310  +
    chr7  56736  56756   D17003_CTCF_R7  354  +
    chr7  56761  56781   D17003_CTCF_R4  220  +
    chr7  56772  56792   D17003_CTCF_R7  372  +
    chr7  56775  56795   D17003_CTCF_R4  207  +

Selecting 2 random lines might return this::

    chr7  56736  56756   D17003_CTCF_R7  354  +
    chr7  56775  56795   D17003_CTCF_R4  207  +

    </help>
</tool>