Add pipeline show subcommand

[SoManyHs]

Experience

The help menu

$ ecs-preview pipeline show -h
Show details of the pipeline associated with your project.

Usage
  ecs-preview pipeline show [flags]

Flags
      -h,  --help                    Help for command.
      -p, --project string  Name of the project.
      --json            Optional. Output in JSON format.
      --resources       Optional. Resources of your environment.

Examples
  $ ecs-preview pipeline show

Output

**About**
  Name           backend-pipeline-backend-SoManyHs-aws-reinvent-trivia-2019-backend
  Region         us-west-2
  AccountID    xxxxxxxxxx

**Stages**

  Name                  Provider             Details
  ----------           -----------        ----------       
 Source               GitHub                 Repo:  https://github.com/SoManyHs/aws-reinvent-trivia-2019- backend
 Build                   CodeBuild           Project name: backend-pipeline-backend-SoManyHs-aws-reinvent-trivia-2019-backend-BuildProject
 DeployTo-test       Cloudformation   Stack name: backend-test-myapp
 DeployTo-prod      Cloudformation  Stack name: backend-prod-myapp


**Resources**

AWS::IAM::Role                             backend-hotdog-brownies-CustomResourceRole-1BLCINGWXTAJQ
AWS::IAM::Role                             backend-hotdog-brownies-ExecutionRole-1BGL72COFIILB
AWS::CodeBuild::Project              ...
AWS::CodePipeline::Pipeline        ... 

etc

JSON:

$ ecs-preview pipeline show --json

[
  {
    "Project": "my-project",
    "Account": "1234567890"
    "Stages": [
            {
                "name": "Source",
                "actions": [
                    {
                        "inputArtifacts": [],
                        "name": "SourceCodeFor-backend",
                        "actionTypeId": {
                            "category": "Source",
                            "owner": "ThirdParty",
                            "version": "1",
                            "provider": "GitHub"
                        },
                        "outputArtifacts": [
                            {
                                "name": "SCCheckoutArtifact"
                            }
                        ],
                        "configuration": {
                            "Owner": "SoManyHs",
                            "Repo": "aws-reinvent-trivia-2019-backend",
                            "Branch": "master",
                            "OAuthToken": "****"
                        },
                        "runOrder": 1
                    }
                ]
            },
            {
                "name": "Build",
                "actions": [
                    {
                        "inputArtifacts": [
                            {
                                "name": "SCCheckoutArtifact"
                            }
                        ],
                        "name": "Build",
                        "actionTypeId": {
                            "category": "Build",
                            "owner": "AWS",
                            "version": "1",
                            "provider": "CodeBuild"
                        },
                        "outputArtifacts": [
                            {
                                "name": "BuildOutput"
                            }
                        ],
                        "configuration": {
                            "ProjectName": "backend-pipeline-backend-SoManyHs-aws-reinvent-trivia-2019-backend-BuildProject"
                        },
                        "runOrder": 1
                    }
                ]
            },
            {
                "name": "DeployTo-staging",
                "actions": [
                    {
                        "inputArtifacts": [
                            {
                                "name": "BuildOutput"
                            }
                        ],
                        "name": "CreateOrUpdate-ducky-staging",
                        "roleArn": "arn:aws:iam::xxxxxxxxxx:role/backend-staging-EnvManagerRole",
                        "actionTypeId": {
                            "category": "Deploy",
                            "owner": "AWS",
                            "version": "1",
                            "provider": "CloudFormation"
                        },
                        "outputArtifacts": [],
                        "configuration": {
                            "ActionMode": "CREATE_UPDATE",
                            "ChangeSetName": "backend-staging-ducky",
                            "RoleArn": "arn:aws:iam::xxxxxxxx:role/backend-staging-CFNExecutionRole",
                            "Capabilities": "CAPABILITY_NAMED_IAM",
                            "StackName": "backend-staging-ducky",
                            "TemplateConfiguration": "BuildOutput::infrastructure/ducky-staging.params.json",
                            "TemplatePath": "BuildOutput::infrastructure/ducky.stack.yml"
                        },
                        "region": "us-east-2",
                        "runOrder": 2
                    }
                ]
            },
            {
                "name": "DeployTo-hotdog",
                "actions": [
                    {
                        "inputArtifacts": [
                            {
                                "name": "BuildOutput"
                            }
                        ],
                        "name": "CreateOrUpdate-ducky-hotdog",
                        "roleArn": "arn:aws:iam::xxxxxx:role/backend-hotdog-EnvManagerRole",
                        "actionTypeId": {
                            "category": "Deploy",
                            "owner": "AWS",
                            "version": "1",
                            "provider": "CloudFormation"
                        },
                        "outputArtifacts": [],
                        "configuration": {
                            "ActionMode": "CREATE_UPDATE",
                            "ChangeSetName": "backend-hotdog-ducky",
                            "RoleArn": "arn:aws:iam::xxxxxxx:role/backend-hotdog-CFNExecutionRole",
                            "Capabilities": "CAPABILITY_NAMED_IAM",
                            "StackName": "backend-hotdog-ducky",
                            "TemplateConfiguration": "BuildOutput::infrastructure/ducky-hotdog.params.json",
                            "TemplatePath": "BuildOutput::infrastructure/ducky.stack.yml"
                        },
                        "region": "us-east-2",
                        "runOrder": 2
                    }
                ]
            }
        ]
}

Related: #632

[iamhopaul123]

What is the "Details" section for the human output?

[SoManyHs]

@iamhopaul123 depends on the stage. I figured for source, it makes sense to show the github repo name, for build, the name of the build project, etc. Since it's not the same for each stage though not sure if there's a better way to display that information, or what else to potentially include that wouldn't be overkill

[iamhopaul123]

@SoManyHs how about another nested structure in "stages" so that we can flatten the "configuration" field? Not sure either if that will be very verbose.

[SoManyHs]

Good idea.

Think we need a flag for project or nah?

[iamhopaul123]

Yeah I think we still need a flag for project.