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## Introduction

**nf-core/genomeassembler** is a bioinformatics pipeline that carries out genome assembly, polishing and scaffolding from long reads (ONT or pacbio). Assembly can be done via `flye` or `hifiasm`, polishing can be carried out with `medaka` (ONT), or `pilon` (requires short-reads), and scaffolding can be done using `LINKS`, `Longstitch`, or `RagTag` (if a reference is available). Quality control includes `BUSCO`, `QUAST` and `merqury` (requires short-reads).
Currently, this pipeline does not implement phasing of polyploid genomes or HiC scaffolding.

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## Usage

> [!NOTE]
> If you are new to Nextflow and nf-core, please refer to [this page](https://nf-co.re/docs/usage/installation) on how to set-up Nextflow. Make sure to [test your setup](https://nf-co.re/docs/usage/introduction#how-to-run-a-pipeline) with `-profile test` before running the workflow on actual data.

First, prepare a samplesheet with your input data that looks as follows:

`samplesheet.csv`:

```csv
sample,ontreads,hifireads,ref_fasta,ref_gff,shortread_F,shortread_R,paired
sampleName,ontreads.fa.gz,hifireads.fa.gz,assembly.fasta.gz,reference.fasta,reference.gff,short_F1.fastq,short_F2.fastq,true
```

Each row represents one genome to be assembled. `sample` should contain the name of the sample, `ontreads` should contain a path to ONT reads (fastq.gz), `hifireads` a path to HiFi reads (fastq.gz), `ref_fasta` and `ref_gff` contain reference genome fasta and annotations. `shortread_F` and `shortread_R` contain paths to short-read data, `paired` indicates if short-reads are paired. Columns can be omitted if they contain no data, with the exception of `shortread_R`, which needs to be present if `shortread_F` is there, even if it is empty.

Now, you can run the pipeline using:

```bash
nextflow run nf-core/genomeassembler \
   -profile <docker/singularity/.../institute> \
   --input samplesheet.csv \
   --outdir <OUTDIR>
```

> [!WARNING]
> Please provide pipeline parameters via the CLI or Nextflow `-params-file` option. Custom config files including those provided by the `-c` Nextflow option can be used to provide any configuration _**except for parameters**_; see [docs](https://nf-co.re/docs/usage/getting_started/configuration#custom-configuration-files).

For more details and further functionality, please refer to the [usage documentation](https://nf-co.re/genomeassembler/usage) and the [parameter documentation](https://nf-co.re/genomeassembler/parameters).

## Pipeline output

To see the results of an example test run with a full size dataset refer to the [results](https://nf-co.re/genomeassembler/results) tab on the nf-core website pipeline page.
For more details about the output files and reports, please refer to the
[output documentation](https://nf-co.re/genomeassembler/output).

## Credits

nf-core/genomeassembler was originally written by [Niklas Schandry](https://github.com/nschan), of the Faculty of Biology of the Ludwig-Maximilians University (LMU) in Munich, Germany.

I thank the following people for their extensive assistance and constructive reviews during the development of this pipeline:

- [Mahesh Binzer-Panchal](https://github.com/mahesh-panchal)
- [Matthias Hörtenhuber](https://github.com/mashehu)
- [Louis Le Nézet](https://github.com/LouisLeNezet)
- [Júlia Mir Pedrol](https://github.com/mirpedrol)
- [Daniel Straub](https://github.com/d4straub)

## Contributions and Support

If you would like to contribute to this pipeline, please see the [contributing guidelines](.github/CONTRIBUTING.md).

For further information or help, don't hesitate to get in touch on the [Slack `#genomeassembler` channel](https://nfcore.slack.com/channels/genomeassembler) (you can join with [this invite](https://nf-co.re/join/slack)).

## Citations

<!-- If you use nf-core/genomeassembler for your analysis, please cite it using the following doi: [10.5281/zenodo.XXXXXX](https://doi.org/10.5281/zenodo.XXXXXX) -->

An extensive list of references for the tools used by the pipeline can be found in the [`CITATIONS.md`](CITATIONS.md) file.

You can cite the `nf-core` publication as follows:

> **The nf-core framework for community-curated bioinformatics pipelines.**
>
> Philip Ewels, Alexander Peltzer, Sven Fillinger, Harshil Patel, Johannes Alneberg, Andreas Wilm, Maxime Ulysse Garcia, Paolo Di Tommaso & Sven Nahnsen.
>
> _Nat Biotechnol._ 2020 Feb 13. doi: [10.1038/s41587-020-0439-x](https://dx.doi.org/10.1038/s41587-020-0439-x).
