fyoo 0.1.1

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Fyoo is a simple argument templatizer that wraps around a command. CLIs exist for pretty much everything, isn’t it about time we started using them in our pipelines as they are? The best data flow code is code you don’t have to write.

Basic Usage

Fyoo can provide context to a subcommand’s arguments after --. All arguments to that subcommand become pre-rendered jinja2 templates.

Setup for examples

# Create a sqlite3 db for this example
sqlite3 example.db \
'create table if not exists
   user (username string, created date default current_date);
insert into user(username) values ("cooluser");'

Fyoo allows you to inject context into shell arguments in a few ways, --fyoo-set being the simplest and easiest to get started with.

# run a templatized/dynamic query to csv output
fyoo \
  --fyoo-set table=user \
  --fyoo-set db=example.db \
  -- \
sqlite3 \
  '{{ db }}' \
  'select * from {{ table }} where date(created) = "{{ date() }}"' \
  -csv -header
# username,created
# cooluser,2020-06-21

This goes further than simple bash replacement, because you have the full template power of jinja2 between when arguments are processed and before the process is started.

select count(*)
from {{ table }}
{%- if condition %}
where {{ condition }}
{%- endif %}

# The template file contents are passed as a bash argument, but then
# fyoo renders the template before passing it to sqllite3 subcommand.
fyoo \
  --fyoo-set table=user \
  --fyoo-set db=example.db \
  --fyoo-set condition=1=1
  -- \
sqlite3 \
  '{{ db }}' \
  "$(cat count.tpl.sql)"
# 1 (assuming same example from before