WDL

WDL, aka Workflow Description Language, is an open source programming language created in 2012.

Source code:

git clone https://github.com/openwdl/wdl

#446on PLDB

11Years Old

888Repos

The Workflow Description Language (WDL) is a way to specify data processing workflows with a human-readable and -writeable syntax. WDL makes it straightforward to define analysis tasks, chain them together in workflows, and parallelize their execution. The language makes common patterns simple to express, while also admitting uncommon or complicated behavior; and strives to achieve portability not only across execution platforms, but also different types of users. Whether one is an analyst, a programmer, an operator of a production system, or any other sort of user, WDL should be accessible and understandable.

WDL website
WDL is developed on GitHub and has 550 stars
There are at least 888 WDL repos on GitHub
file extensions for WDL include wdl
WDL on Twitter
The Google BigQuery Public Dataset GitHub snapshot shows 23 users using WDL in 30 repos on GitHub
GitHub supports syntax highlighting for WDL
openwdl.org was registered in 2017
Read more about WDL on the web: 1.

Example from Linguist:

# Sample originally from https://github.com/broadinstitute/centaur

task hello {
  String addressee
  command {
    echo "Hello ${addressee}!"
  }
  output {
    String salutation = read_string(stdout())
  }
  runtime {
    docker: "ubuntu@sha256:71cd81252a3563a03ad8daee81047b62ab5d892ebbfbf71cf53415f29c130950"
  }
}

workflow wf_hello {
  call hello
  output {
     hello.salutation
  }
}

Feature	Supported	Token	Example
Comments	✓		# A comment
Line Comments	✓	#	# A comment
Semantic Indentation	X

WDL - Programming language

Language features