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Comments on process template syntax
From: |
Ricardo Wurmus |
Subject: |
Comments on process template syntax |
Date: |
Sun, 02 Feb 2020 11:20:36 +0100 |
User-agent: |
mu4e 1.2.0; emacs 26.3 |
Hi,
While looking at the examples at https://www.guixwl.org/beyond-started,
I found that process templates might be difficult to understand, and
that they have no pretty syntax.
--8<---------------cut here---------------start------------->8---
process: (list-file-template filename)
name
string-append "list-file-"
basename filename
packages "gzip"
inputs filename
outputs
string-append filename ".list"
run-time
complexity
space 20 mebibytes
time 30 seconds
# { gzip --list {{inputs}} > {{outputs}} }
--8<---------------cut here---------------end--------------->8---
The first line is easy to understand for lispers but it might look weird
to people who come from other workflow languages or programming
languages. This describes a procedure called “list-file-template” that
returns a process parameterized on the argument “filename”.
Nextflow has no concept of procedures that produce processes when given
arguments. It does however have a concept of data streams that can be
fed into processes, which results in a process to be instantiated for
every element of the stream. The stream may be created from a directory
containing files.
This implementation likely stems from the realization that the “template
case” is the most common case for processes. Rarely ever is it
necessary to define a process that does *not* require parameterization
on its inputs.
Can we make the common case simpler and easier to understand? (FWIW, I
intend to rename the “process:” macro to just “process” to remove
confusing syntactic noise, so anything about the first line may be
changed.)
--
Ricardo
- Comments on process template syntax,
Ricardo Wurmus <=
- Re: Comments on process template syntax, Kyle Meyer, 2020/02/02
- Re: Comments on process template syntax, Ricardo Wurmus, 2020/02/03
- Re: Comments on process template syntax, Kyle Meyer, 2020/02/03
- Re: Comments on process template syntax, Ricardo Wurmus, 2020/02/03
- Re: Comments on process template syntax, Kyle Meyer, 2020/02/03
- Re: Comments on process template syntax, Ricardo Wurmus, 2020/02/04
- Re: Comments on process template syntax, Kyle Meyer, 2020/02/04
- Re: Comments on process template syntax, zimoun, 2020/02/05
Re: Comments on process template syntax, Roel Janssen, 2020/02/03