bashscope

#!/bin/bash

set_variables()
{
    v_named="outer_named"
    declare v_declare="outer_declared"
    local v_local="outer_local"

    echo "Result 1:"
    show_caller_variables

    echo "Result 2:"
    reassign_variables

    echo "Result 3:"
    show_caller_variables
}

show_caller_variables()
{
    echo "Reading functions set in calling function:"
    echo "v_named='${v_named}'"
    echo "v_declare='${v_declare}'"
    echo "v_local='${v_local}'"
    echo
}

reassign_variables()
{
    echo "Reassigning variables named in set_variables():"
    v_named="reassigned, name only"
    declare v_declare="reassigned, declared unspecified" 
    local v_local

    show_caller_variables
}

demo_declare_trap()
{
    cmd=(
        --title="BASH Declare Assign Trap"
        --fixed
        --center
        --text="Click on a button below to set the exit status on the button label."
        --entry
        --entry-label "Text Entry"
        --entry-text "Text to return. Replace it if you want to."
        --always-print-result
        --button="Return 1":1
        --button="Return 2":2
        --button="Return 3":3
    )

    # Experiment 1: Variable result used without declaration:
    result=$( yad "${cmd[@]}" --entry-text "Call without declare/local/global" )
    exval=$?
    echo "YAD exit status='$exval', result='${result}'"

    # Experiment 2: Variable l_result declared (as local) on same line as the subshell assignment:
    local l_result=$( yad "${cmd[@]}" --entry-text "Call with co-lined declare/local/global" )
    exval=$?
    echo "YAD exit status='$exval', result='${l_result}'"

    # Experiment 3: Variable m_result declared on a separate line from the subshell assignment:
    local m_result
    m_result=$( yad "${cmd[@]}" --entry-text "Call with m_result declared local on previous line." )
    exval=$?
    echo "YAD exit status='$exval', result='${m_result}'"
}


if [ $# -gt 0 ]; then
    case "$1" in
        scope) set_variables ;;
        trap)  demo_declare_trap ;;
        maker)
            echo "PS1='\\[\\033[01;36m\\]user\\[\\033[0m\\] $ '" > /tmp/doctips_profile
            xterm -fa mono -fs 8 -geometry 86x20 -e bash --rcfile /tmp/doctips_profile &
            gedit scripts_basharray.sh
            unlink /tmp/doctips_profile
            ;;
    esac
else
    echo
    echo "Usage: ./bashscope (scope|trap|maker)"
    echo
    echo "'scope' shows scope experiment"
    echo "'trap' shows exit value trap"
    echo "'maker' opens a small shell for making screen-prints of code and results."
    echo
fi