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render-template.sh

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#!/usr/bin/env bash

# This script is used to render GitHub Workflow templates.

set -euo pipefail

# Check the number of arguments. 2 or 3 are expected.

if [ $# -lt 2 ] || [ $# -gt 3 ]; then

echo "Usage: render.sh <template> <context> <output>"

exit 1

fi

template="$1"

context="$2"

output="${3:-}"

engine='

s#\$\{\{\{\s*\.?(.*?)\s*\}\}\}#

my $key = $1;

my $result = `jq -cjn '"'"'env.context | fromjson | .$key'"'"'`;

if($? != 0) {

print STDERR "jq: error on line: $_";

exit 1;

}

$result

#gex

'

# Render the template.

export context

# If template and output are the same, perform the rendering in-place.

if [ "$template" = "$output" ]; then

perl -p -i -e "$engine" "$template"

# Otherwise, if output is not specified, print the result to stdout.

elif [ -z "$output" ]; then

perl -p -e "$engine" "$template"

# Otherwise, write the result to the specified output file.

else

perl -p -e "$engine" "$template" > "$output"

fi