## 17.6 Collaborate on Rmd documents through Google Drive with trackdown

The trackdown package offers a simple solution for collaborative writing and editing of R Markdown (or Sweave) documents. Based on the googledrive package , trackdown allows to upload the local .Rmd (or .Rnw) file as a plain-text file to Google Drive. By taking advantage of the easily readable Markdown (or LaTeX) syntax and the well-known online interface offered by Google Docs, collaborators can easily contribute to the writing and editing process. After integrating all authors’ contributions, the final document can be downloaded and rendered locally.

You can install trackdown from CRAN, or you may try the development version on GitHub (https://github.com/claudiozandonella/trackdown):

# install from CRAN
install.packages("trackdown")

# install the development version
remotes::install_github("claudiozandonella/trackdown", build_vignettes = TRUE)

The package documentation is available at https://claudiozandonella.github.io/trackdown/.

### 17.6.1 The trackdown Workflow

During the collaborative writing/editing of an .Rmd (or .Rnw) document, it is important to employ different workflows for computer code and narrative text:

• Code - Collaborative code writing is done most efficiently by following a traditional Git-based workflow using an online repository (e.g., GitHub or GitLab).
• Narrative Text - Collaborative writing of narrative text is done most efficiently using Google Docs which provides a familiar and simple online interface that allows multiple users to simultaneously write/edit the same document.

Thus, the workflow’s main idea is simple: Upload the .Rmd (or .Rnw) document to Google Drive to collaboratively write/edit the narrative text in Google Docs; download the document locally to continue working on the code while harnessing the power of Git for version control and collaboration. This iterative process of uploading to and downloading from Google Drive continues until the desired results are obtained (See Figure 17.2). The workflow can be summarized as:

Collaborative code writing using Git & collaborative writing of narrative text using Google Docs

For a detailed example of the workflow see https://claudiozandonella.github.io/trackdown/articles/trackdown-workflow.html.

#### Functions and Special Features

trackdown offers different functions to manage the workflow:

• upload_file() uploads a file for the first time to Google Drive.
• update_file() updates the content of an existing file in Google Drive with the contents of a local file.
• download_file() downloads the edited version of a file from Google Drive and updates the local version.
• render_file() downloads a file from Google Drive and renders it locally.

Moreover, trackdown offers additional features to facilitate the collaborative writing and editing of documents in Google Docs. In particular, it is possible to:

• Hide Code: Code in the header of the document (YAML header or LaTeX preamble) and code chunks are removed from the document when uploading to Google Drive and are automatically restored during download. This prevents collaborators from inadvertently making changes to the code which might corrupt the file and allows them to focus on the narrative text.
• Upload Output: The actual output document (i.e., the rendered file) can be uploaded to Google Drive in conjunction with the .Rmd (or .Rnw) document. This helps collaborators to evaluate the overall layout including figures and tables and allows them to add comments to suggest and discuss changes.
• Use Google Drive shared drives: The documents can be uploaded to either a personal Google Drive or to a shared drive to facilitate collaboration.

Google Docs offers users a familiar, intuitive, and free web-based interface that allows multiple users to simultaneously write/edit the same document. In Google Docs it is possible to:

• track changes (incl. accepting/rejecting suggestions)