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Pipeline tool for NGS data

Project description

# Pigeon

## Introduction Tool for pipeing inputs and outputs of multiple cli tools. Pigeon takes in only a config file as input. Everything required to run the pipeline are specified in config file. The config file is specified according to [python configparser](

## Quick Install #### Linux&Mac

> sudo pip3 install –index-url pigeon

#### Windows

> pip install –index-url pigeon

## Resources for NGS None of the tools or data files are supplemented by pigeon so they need to be downloaded. For example configuration file, exome sequencing pipeline,

## How to use Create yourself a configuration file

> pigeon createconfig

Modify for your analysis. (See below.)

> pigeon -c my_config.conf -d

If everything looks alright run for real.

> pigeon -c my_config.conf

## Config File

Config file consists of three parts.

  • General
  • Pipeline
  • Individual tool blocks

## General Area used to define project name, output directory, input files, and resource files like reference genome or target file. Following variables are necessary for run.


  • project_name : name of your project

  • output_dir : where to write output files

  • input_files : input files for analysis, space separated, pairs should be next to each other. e.g.

    > input_files = A.txt B.txt C.txt

    or for paired

    > input_files = A1.txt A2.txt B1.txt B2.txt C1.txt C2.txt

Optional variable can also be decleared here. Based on your or tool requirements. Later these variables can be called in the config file using ${GENERAL:optional_variable}.


> reference_genome = /path/to/my/reference_genome.fa

> bed_file = /path/to/my/target.bed

> known_snp = /path/to/my/snp.vcf

> my_database = /path/to/my/favorite.db

## Pipeline This area should contain paths to tools that is understanble by your shell. As well as the run order of tools. e.g.

> pipeline = job1 job2 job3

> A = path/to/A

> B = path/to/B

> C = path/to/C

## Tool Blocks Name of the block should be same as in pipeline. By continuing example above;

> [job1]

> [job2]

> [job3]

Arguments that can be used in these blocks as follows:

#### Run Args

  • tool: tool variable from pipeline block. e.g.

    > tool = ${PIPELINE:A}

  • sub_tool: if tool has a sub tool like ‘bwa mem’. e.g.

    > sub_tool = mem

  • args: arguments of the tools

  • java: if tool is a jar file add java -jar before it.

  • pass: if True it won’t run the block. But the block still be part of the pipeline. This option is helpful for resuming interrupted pipeline.

#### Input Args * input_from: Name of the block that that’s output is this jobs input. First jobs input_from should be input_files. * input_multi: can be ‘paired’ or ‘all’. Paired option splits input files stream into groups of two. All option uses all of the input files. * input_flag_repeat: If tool requires input flag for each input this command will add given flag before each input.

  • secondary_in_placeholder

#### Output Args

  • suffix: add suffix to output file name
  • ext: file extension of the output
  • dump_dir: creates a directory and outputs there.
  • paired_output: this option will pair the input and the output of the tool.
  • secondary_out_placeholder
  • secondary_suffix
  • secondary_ext
  • secondary_dump_dir

#### Placeholders These are joker words that can be used in args.

  • input_placeholder
  • secondary_input_placeholder
  • output_placeholder
  • secondary_output_placeholder

### Example Config

> [[GENERAL]] > project_name = my_project > output_dir = /path/to/output_directory > input_files = A.txt B.txt C.txt > my_db = /path/to/my.db

> [[PIPELINE]] > pipeline = job1 job2 job3 > A = /path/to/A > B = /path/to/B > C = /path/to/C

> [job1] > tool = A > input_from = input_files > args = -i input_placeholder -o output_placeholder > suffix = job1_A > ext = txt

> [job2] > tool = B > input_from = job1 > args = -i input_placeholder -o output_placeholder > suffix = job2_B > ext = txt

> [job3] > tool = C > input_from = job2 > args = -i input_placeholder -o output_placeholder > suffix = job3_C > ext = txt

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