Bash - How to make dynamic menu selection without eval

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                          I'm making a script for Docker environments, and I'm a bit stuck with a pigeonhole I've gotten myself into. 

    #!/bin/bash
    
    set -euo pipefail
    
    # Variables
    gituser="modem7"
    gitrepo="docker-devenv"
    gitfolder="Environments"
    buildername="DockerDevBuilder"
    
    # Colours
    RED="\e[31m"
    GREEN="\e[32m"
    END="\e[0m"
    
    echo "========================================="
    printf "        Checking Dependencies\n"
    echo "========================================="
    printf "Checking if dependencies are installed...\n"
    pkg_list=(docker jq)
    tc() { set ${*,,} ; echo ${*^} ; }
    for pkg in "${pkg_list[@]}"
    do
      titlecase=$(tc $pkg)
      isinstalled=$(dpkg-query -l $pkg > /dev/null 2>&1)
        if [ $? -eq 0 ];
         then
           printf "~ $titlecase is...${GREEN}installed${END}\n"
         else
           printf "~ $titlecase is...${RED}not installed${END}\n"
           printf "Exiting Script. Install $pkg.\n"
           echo "========================================="
           exit
        fi
    done
    echo "========================================="
    
    cat  /dev/null 2>&1; then
                  echo ""
                  echo "Builder $buildername created"
                else
                  echo "Builder already created, using $buildername"
                  docker buildx use "DockerDevBuilder"
                  echo ""
              fi
              echo "Creating $dev_name Environment..."
              docker buildx build --rm=true --build-arg BUILDKIT_INLINE_CACHE=1 --load -t $lowerdev:dev https://github.com/$gituser/$gitrepo.git#:$gitfolder/$dev_name  \
              && clear \
              && echo "=========================================" \
              && echo "Activating $dev_name Dev Environment..." \
              && echo "Press CTRL + D or type exit to leave the container" \
              && docker run --rm -it --name "$dev_name"Dev"$RANDOM" --hostname "$dev_name"Dev"$RANDOM" "$lowerdev:dev"
              break
              ;;
          "Prune")
              echo "Clearing Docker cache..."
              docker system prune -af
              echo ""
              echo "Removing Docker buildx builder..."
              if docker buildx rm "$buildername" > /dev/null 2>&1; then
                  echo ""
                  echo "Builder $buildername removed"
                else
                  echo "Builder already removed, no action performed"
                  echo ""
              fi          
              exec bash $0
              ;;
          "Quit")
              echo "Exiting script"
              exit
              ;;
           *)
              echo "invalid option $REPLY"
              ;;
        esac"
    done
    
    exit 0

I'm currently using "eval "case \"$dev_name\" in" but that seems problematic from what I've read. 

It works, but I'm not sure if there is a better way to achieve what the results.

The choices are created from the folder names in the repo , but I'm not quite sure how to get out of using eval. Am I worrying about something pointless?
                        
Asked by Modem7 (11 rep)
Nov 3, 2022, 06:56 PM
Last activity: Nov 4, 2022, 01:17 AM
Bash - How to make dynamic menu selection without eval

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