build.sh

#!/usr/bin/env bash

HOME=$(pwd)
OUTPUT=${HOME}/output

# Check commands exist
if [[ ! "$(command -v yq)" ]]; then
    echo "Please install yq first: https://github.com/mikefarah/yq"
    exit 1
fi

# Check config yaml file
if [[ ! -f "$1" ]]; then
    echo "Config file $1 doesn't exist!"
    echo "./build.sh <config.yaml>"
    exit 1
fi

# Create directory for output
mkdir -p "$OUTPUT"

for filename in $(yq '.[] | key' "$1"); do
    echo "Generating ${filename}..."
    if [[ ! -f "$filename" ]]; then
        echo "$filename doesn't exist!"
        break
    fi

    if [[ -n "$2" && "$2" != *"$filename"* ]]; then
        echo "Skip $filename!"
        continue
    fi

    if [[ "$filename" = *"/"* ]]; then
        mkdir -p "$OUTPUT/$(dirname "$filename")"
    fi

    cmd="sed"
    for key in $(yq '.["'$filename'"][] | key' "$1"); do
        var=$(yq '.["'$filename'"]["'$key'"]' "$1")
        echo "  Key: $key, Value: $var"
        cmd="$cmd -e 's/%$key%/$var/g'"
    done
    cmd="$cmd $HOME/$filename > $OUTPUT/$filename"
    eval "$cmd"
done

# Show unreplaced variables
echo
grep -rE '%\w\w+%' "$OUTPUT"/*