.gitlab-ci.yml

stages:
    - Build
    - Run
    - Verify

Build code:
    only:
        - merge_requests
    image: gcc
    stage: Build
    script:
        - make
    artifacts:
        paths:
            - hello
        
Nominal Run:
    only:
        - merge_requests
    image: gcc
    stage: Run
    script:
        - ./hello | tee output/nominal.txt
    artifacts:
        paths:
            - output

Cmd-line Run:
    only:
        - merge_requests
    image: gcc
    stage: Run
    script:
        - ./hello a b c d e f g h i j k l m n o p q r s t u v w x y z
    artifacts:
        paths:
            - output

Nominal Width Check:
    only:
        - merge_requests
    stage: Verify
    script:
        - "ls output/nominal.txt"  # File must exist
        - "! grep 'Width:  [^2]' output/nominal.txt" # If any width is not 4, fail

Cmd-line Length Check:
    only:
        - merge_requests
    stage: Verify
    script:
        - "ls output/[abcdefghijklmnopqrstuvwxyz].txt"  # Files must exist
        - "! grep 'Length: [^1]' output/[abcdefghijklmnopqrstuvwxyz].txt" # If any length is not 3, fail