From the root of the xCode project, this will transform all environment variables to a Secrets.swift in the Source folder.

prepare.sh

#!/bin/bash

# prepareSecrets
#
# prepare the Secrets.swift file from environment variables
#

# Define output file
OUTPUT_FILE="Sources/Secrets.swift"

echo "//" > "$OUTPUT_FILE"
echo "//  Secrets.swift" >> "$OUTPUT_FILE"
echo "//  SeenOnScreen" >> "$OUTPUT_FILE"
echo "//" >> "$OUTPUT_FILE"
echo "// Generated file. Please do not delete, nor edit" >> "$OUTPUT_FILE"
echo "//" >> "$OUTPUT_FILE"
echo "" >> "$OUTPUT_FILE"

# Start writing to the Secrets.swift file
echo "enum Secrets {" >> "$OUTPUT_FILE"

# Read each environment variable
env | while IFS='=' read -r key value; do
    # Ignore empty lines and comments
    if [[ -z "$key" || "$key" =~ ^# || "$key" == "_"|| "$key" == "PATH" ]]; then
        continue
    fi
    
    # Trim whitespace
    key=$(echo "$key" | xargs)
    value=$(echo "$value" | xargs)
    
    # Convert key to lowercase before processing
    key=$(echo "$key" | tr '[:upper:]' '[:lower:]')

    # Convert key to camelCase (basic transformation)
    key=$(echo "$key" | awk 'BEGIN{FS=OFS="_"}{
        for (i=1; i<=NF; i++) {
            if (i == 1) printf("%s", tolower($i));
            else printf("%s%s", toupper(substr($i,1,1)), substr($i,2));
        }
    }')
    
    # Escape double quotes in values
    value=$(echo "$value" | sed 's/"/\\"/g')
    
    # Write to Secrets.swift
    echo "    static var $key: String { \"$value\" }" >> "$OUTPUT_FILE"
done

# Close the enum
echo "}" >> "$OUTPUT_FILE"

echo "Secrets.swift has been generated successfully."