Handlematters
Self-contained template system with Handlebars and inline shell scripts
Introduction
Handlematters is a template system that combines Handlebars and shell scripts. It is intended to replace simple substitution tasks such as those done by envsubst.
Here is an example of a Handlematters template:
hello.hms
Any text before the context or template block is just a comment.
It will not be output.
--- context ---
greeting: echo 'hello, world'
count: |
echo -n 'hello, world' | wc --chars
--- template ---
{{greeting}} (length: {{count}})
Passing this file to handlematters will result in the following output:
$ handlematters hello.hms
hello, world (length: 12)
Let's take a closer look.
--- context ---
greeting: echo 'hello, world'
count: |
echo -n 'hello, world' | wc --chars
The context block is a YAML document. Each value of the property will be executed as a shell script and the output will be the resulting value.
--- template ---
{{greeting}} (length: {{count}})
The template block is a Handlebars template. {{...}} to output the context value. If you are not familiar with Handlebars syntax, have a look at https://handlebarsjs.com/.
Let's look at a more practical example:
Note: The expression in triplet braces {{{...}}} will be output without HTML escaping.
--- context ---
name: cargo metadata --format-version=1 --no-deps | jq -r .packages[0].name
author: cargo metadata --format-version=1 --no-deps | jq -r .packages[0].authors[0]
--- template ---
{{{name}}} by {{{author}}}
Will result in:
handlematters by Keita Urashima
Of course, this README is also generated by Handlematters. See: https://github.com/ursm/handlematters/blob/main/README.md.hms
Usage
handlematters 0.1.0
Keita Urashima
Self-contained template system with Handlebars and inline shell scripts
USAGE:
handlematters [FILE]
ARGS:
Input file [default: stdin]
OPTIONS:
-h, --help Print help information
-V, --version Print version information
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