name: "Well-known variable tests"
cases:
  - name: "Basic defaulted PATH var"
    stdin: |
      if [[ -z "$PATH" ]]; then
        echo "PATH is not set or is empty"
      else
        echo "PATH is set and non-empty"
      fi

  - name: "Basic variables"
    known_failure: true # Not fully implemented
    stdin: |
      declare -p > ./vars.txt
      # Filter out variables set by test infrastructure.
      # Filter out brush-specific variables.
      cat vars.txt | grep '^declare ' | grep -v LLVM | grep -v BRUSH | sed -e 's/=.*//'
      rm vars.txt

  - name: "Static well-known variables"
    stdin: |
      echo "EUID: $EUID"
      echo "UID: $UID"

      [[ $BASHPID == $$ ]]
      echo 'BASHPID == \$$: ' $?

      [[ $BASH_ARGV0 == $0 ]]
      echo 'BASH_ARGV0 == $0: ' $?

      [[ $MACHTYPE == ${BASH_VERSINFO[5]} ]]
      echo 'MACHTYPE == ${BASH_VERSINFO[5]: ' $?

  - name: "OSTYPE pattern match for current platform"
    stdin: |
      case "$OSTYPE" in
        linux*)           echo "prefix=linux" ;;
        darwin*)          echo "prefix=darwin" ;;
        freebsd*)         echo "prefix=freebsd" ;;
        netbsd*)          echo "prefix=netbsd" ;;
        openbsd*)         echo "prefix=openbsd" ;;
        dragonfly*)       echo "prefix=dragonfly" ;;
        solaris*)         echo "prefix=solaris" ;;
        cygwin*|msys*|windows*)
                          echo "prefix=windows-like" ;;
        *)                echo "prefix=other:$OSTYPE" ;;
      esac

  - name: "dollar-_"
    stdin: |
      # Check on start
      [[ "$0" == "$_" ]] && echo '$_ matches $0 on start'

      # Now do something
      echo first middle last >/dev/null
      echo "\$_ after first echo command: $_"
      echo
      echo "\$_ after second echo command: $_"

      # See if a child process sees _ set to its resolved pathname.
      echo "Spawning child process..."
      env -v | grep '^_='
      echo "\$_ after child process exited: $_"

  - name: "BASH_ALIASES"
    stdin: |
      echo "Initial BASH_ALIASES: " ${BASH_ALIASES[@]}
      alias x=y
      echo "Updated BASH_ALIASES: " ${BASH_ALIASES[@]}
      unalias x
      echo "Final BASH_ALIASES: " ${BASH_ALIASES[@]}

  - name: "BASHOPTS"
    min_oracle_version: "5.3" # Changed in bash 5.3
    stdin: |
      # Workaround for brush forcing on extglob
      shopt -u extglob

      echo "BASHOPTS: $BASHOPTS"

  - name: "BASH_SOURCE"
    max_oracle_version: "5.2" # Behavior changed in bash 5.3; still needs investigation
    stdin: |
      echo "Input entry"; declare -p BASH_SOURCE

      function myfunc() {
          echo "In function: \$1: $1"
          declare -p BASH_SOURCE

          if [[ $1 -gt 0 ]]; then
              myfunc $(( $1 - 1 ))
          fi
      }

      myfunc 4

      echo "Input exit"; declare -p BASH_SOURCE

  - name: "FUNCNAME"
    stdin: |
      echo "Input entry"; declare -p FUNCNAME

      function myfunc() {
          echo "In function: \$1: $1"
          declare -p FUNCNAME

          if [[ $1 -gt 0 ]]; then
              myfunc $(( $1 - 1 ))
          fi
      }

      myfunc 4

      echo "Input exit"; declare -p FUNCNAME

  - name: "BASH_SUBSHELL"
    stdin: |
      echo "Initial BASH_SUBSHELL: $BASH_SUBSHELL"
      (echo "Subshell BASH_SUBSHELL: $BASH_SUBSHELL")
      (
        ( echo "Nested subshell BASH_SUBSHELL: $BASH_SUBSHELL"  )
      )

      echo $(echo "Command substitution BASH_SUBSHELL: $BASH_SUBSHELL")

  - name: "BASH_VERSINFO"
    stdin: |
      shopt -s extglob

      echo "len(BASH_VERSINFO): " ${#BASH_VERSINFO[@]}

      # Only inspect the first 4 elements.
      for ((i = 0; i < 4; i++)); do
        cleaned=${BASH_VERSINFO[i]//+([0-9])/d}
        echo "Cleaned BASH_VERSINFO[$i]: $cleaned"
      done

  - name: "BASH_VERSION"
    stdin: |
      shopt -s extglob

      # Replace specific numbers with placeholder text.
      cleaned=${BASH_VERSION//+([0-9])/d}
      echo "Cleaned BASH_VERSION: $cleaned"

  - name: "COMP_WORDBREAKS"
    stdin: |
      dump_var() {
        echo -n "COMP_WORDBREAKS:"
        for ((i=0; i<${#COMP_WORDBREAKS}; i++)); do
          c="${COMP_WORDBREAKS:i:1}"
          echo "  ${c@Q}"
        done | sort
      }

      dump_var

  - name: "EPOCHSECONDS"
    stdin: |
      external=$(date +%s)

      es1=${EPOCHSECONDS}
      [[ $es1 =~ ^[0-9]+$ ]] && echo "EPOCHSECONDS is a number"

      es2=${EPOCHSECONDS}
      [[ $es2 =~ ^[0-9]+$ ]] && echo "EPOCHSECONDS is still a number"

      (( es1 >= external )) && echo "Time is moving forward"
      (( es1 >= es2 )) && echo "Time is moving forward within the shell"

  - name: "GROUPS"
    skip: true # TODO(well-known-vars): macOS failure needs investigation (passes elsewhere)
    stdin: |
      (for group in ${GROUPS[@]}; do
        echo $group
      done) | sort

  - name: "LINENO"
    stdin: |
      echo "LINENO: $LINENO"
      echo "LINENO: $LINENO"
      echo "LINENO: $LINENO"

  - name: "LINENO with multi-line input"
    stdin: |
      for f in 1 2 3; do
        echo "LINENO: $LINENO"
      done

  - name: "RANDOM"
    stdin: |
      first=${RANDOM}
      second=${RANDOM}

      [[ $first != $second ]] && echo "Confirmed RANDOM at least isn't static"
      [[ $first -ge 0 && $first -lt 32768 ]] && echo "RANDOM value is within expected range"
      [[ $second -ge 0 && $second -lt 32768 ]] && echo "RANDOM value is within expected range"

  - name: "SHELL"
    stdin: |
      declare -p SHELL
      echo "SHELL: $SHELL"

  - name: "SHELLOPTS"
    stdin: |
      echo "SHELLOPTS: $SHELLOPTS"

  - name: "SHLVL"
    stdin: |
      echo "SHLVL: $SHLVL"
      bash -c 'echo "bash SHLVL: $SHLVL"'
      $0 -c 'echo "nested SHLVL: $SHLVL"'

  - name: "SRANDOM"
    stdin: |
      first=${SRANDOM}
      second=${SRANDOM}

      [[ $first != $second ]] && echo "Confirmed SRANDOM at least isn't static"