public static LambdaConfigInfo LoadFromFile()

in Tools/LambdaTestTool/src/Amazon.Lambda.TestTool/Runtime/LambdaDefaultsConfigFileParser.cs [33:81]
42 lines of code
13 McCabe index (conditional complexity)

        public static LambdaConfigInfo LoadFromFile(LambdaConfigFile configFile)
        {
            var configInfo = new LambdaConfigInfo
            {
                AWSProfile = !string.IsNullOrEmpty(configFile.Profile) ? configFile.Profile : "default",
                AWSRegion = !string.IsNullOrEmpty(configFile.Region) ? configFile.Region : null,
                FunctionInfos = new List<LambdaFunctionInfo>()
            };

            if (string.IsNullOrEmpty(configInfo.AWSProfile))
                configInfo.AWSProfile = "default";


            var templateFileName = !string.IsNullOrEmpty(configFile.Template) ? configFile.Template : null;
            var functionHandler = !string.IsNullOrEmpty(configFile.DetermineHandler()) ? configFile.DetermineHandler() : null;

            if (!string.IsNullOrEmpty(templateFileName))
            {
                var directory = Directory.Exists(configFile.ConfigFileLocation) ? configFile.ConfigFileLocation : Path.GetDirectoryName(configFile.ConfigFileLocation);
                var templateFullPath = Path.Combine(directory, templateFileName);
                if (!File.Exists(templateFullPath))
                {
                    throw new FileNotFoundException($"Serverless template file {templateFullPath} not found");
                }
                ProcessServerlessTemplate(configInfo, templateFullPath);
            }
            else if(!string.IsNullOrEmpty(functionHandler))
            {
                var info = new LambdaFunctionInfo
                {
                    Handler = functionHandler
                };

                info.Name = !string.IsNullOrEmpty(configFile.FunctionName) ? configFile.FunctionName : null;
                if (string.IsNullOrEmpty(info.Name))
                {
                    info.Name = functionHandler;
                }

                if(configFile.EnvironmentVariables != null)
                {
                    ParseKeyValueOption(configFile.EnvironmentVariables, info.EnvironmentVariables);
                }
            
                configInfo.FunctionInfos.Add(info);
            }
            configInfo.FunctionInfos.Sort((x, y ) => string.CompareOrdinal(x.Name, y.Name));
            return configInfo;
        }