filler

Filler is a simple tool to fill config templates using environment variables.

CLI usage

Usage:

filler --src <directory> --ext <template_extension>

Sample usage:

filler --src /etc --ext tpl

sample test.conf.tpl placed in /etc :

This is template file version {{ getEnv "VERSION" }}

1. This sample command runs filler on /etc directory
2. Filler will search for files with mask *.devops_template (recursively)
3. Filler will find test.conf.devops_template
4. Fills every action getEnv with value of defined variable name.
5. Saves in file without template extension (in this case test.conf)
6. Removes template files

Sample with array:

Variable with array should looks like this:

ARRAY="golang,c,python,ruby""

Template file which use this array:

{{ range getEnvArray "ARRAY"}}{{ . }}
{{ end }}

Output file:

golang
c
python
ruby

With direct environment variable access

{{ .ENV1 }}
{{ .ENV2 }}

With required function

{{ required .MISSING_ENV }}

If MISSING_ENV is not set in the shell an error will be returned:

template: templateCli:2:17: executing "templateCli" at <required>: error calling required: ENV variable is missing

With custom delimiter

~~ .ENV1 ~~

filler --left-delim '~~' --right-delim '~~'

With in-place templating

filler --in-place - extension doesn't need to be provided

Development

Tools

• finch - to build and publish images on MacOS
• devbox - to prepare development environment with required tools, execute devbox shell to enter development environment
• taskfile - to execute tasks related to builds or tests, run task build-and-test to build Filler and execute tests