go install github.com/akm/text-template-cli@latest

$ text-template-cli --help
A simple CLI tool to render text templates.
This application is a tool to render text templates using Go's text/template package.
See https://pkg.go.dev/text/template for more information about template file.

SOURCE must be a file or a directory.
If SOURCE is a file, the rendered content will be written to the standard output, 
or will be written a file in the output directory when --output-directory is given.
If SOURCE is a directory, the rendered content will be written to the output directory.

You can use this application without any INPUT_FILE, but you can also pass JSON, YAML and/or .env files as INPUT FILE to render the template.

Usage:
  text-template-cli SOURCE [INPUT_FILE...] [flags]

Flags:
  -h, --help                      help for text-template-cli
  -o, --output-directory string   Output directory
  -e, --template-ext strings      Template file extensions (default [.tmpl])
  -v, --version                   version for text-template-cli