setup-tuxhat (modified cdm code for my scripts main menu)

#!/bin/bash
# Tux Hat Linux Main Menu Setup Script

name=$(basename "$0")
longname='Tux Hat Linux'
ver='3.3 - Main Menu Setup'

trap '' SIGINT SIGTSTP

# Helper functions.

warn() { (printf ' \033[01;33m*\033[00m '; echo "$name: $*") > /dev/stderr; }
error() { (printf ' \033[01;31m*\033[00m '; echo "$name: $*") > /dev/stderr; }
exitnormal() { exit 0; }
exiterror() { sleep 1; exit 1; }
exitcancel() { exit 2; }
yesno()
{
    [ -z "$1" ] && return 1
    eval value=\$${1}

    case "$value" in
        [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1) return 0;;
        [Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|[Oo][Ff][Ff]|0) return 1;;
        *) warn "invalid value for \`$1'; falling back to \`no' for now.";;
    esac
}

# Source setup-tuxhat configurations.

if [[ -n "$1" ]]; then
    if [[ -f "$1" ]]
    then
        source "$1"
    else
        error "config file \`$1' does not exist."
        exiterror
    fi
elif [[ -f "$HOME/.sthrc" ]]; then
    source "$HOME/.sthrc"
elif [[ -f /etc/sthrc ]]; then
    source /etc/sthrc
fi

# Default options.

dialogrc=${dialogrc:-}
display=${display:-0}
[[ -z "${binlist[*]}" ]] && binlist=()
[[ -z "${namelist[*]}" ]] && namelist=()
[[ -z "${flaglist[*]}" ]] && flaglist=()

# If $binlist is not set in cdmrc or by files in /etc/X11/Sessions,
# try .desktop files in /usr/share/xsessions/ .

if [[ "${#binlist[@]}" == 0 && -d /usr/share/xsessions ]]; then
    desktopsessions=($(find /usr/share/xsessions/ -regex .\*.desktop))
    #TODO: allow full quoting and expansion according to desktop entry spec:
    # http://standards.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#exec-variables

    for ((count=0; count < ${#desktopsessions[@]}; count++)); do
        # TryExec key is there to determine if executable is present,
        # but as we are going to test the Exec key anyway, we ignore it.
        execkey=$(sed -n -e 's/^Exec=//p' <${desktopsessions[${count}]})
        namekey=$(sed -n -e 's/^Name=//p' <${desktopsessions[${count}]})
        if [[ -n ${execkey} && -n ${namekey} ]]; then
            # The .desktop files allow there Exec keys to use $PATH lookup.
            binitem="$(which $(cut -f 1 -d ' ' <<< ${execkey}))"
            # If which fails to return valid path, skip to next .desktop file.
            if [[ $? != 0 ]]; then continue; fi
            binlist+=("${binitem} $(cut -s -f 2- -d ' ' <<< ${execkey})")
            flaglist+=('X')
            namelist+=("${namekey}")
        fi
    done
fi

case "${#binlist[@]}" in
    0)
        error "No programs found in cdm config file, /etc/X11/Sessions or /usr/share/xsessions."
        exiterror
        ;;
    1)
        # No need to call dialog AND clear, only one possible program
        binindex=0
        ;;
    *)
        menu=()
        for ((count = 0; count < ${#namelist[@]}; count++)); do
            menu=("${menu[@]}" "$((count+countfrom))" "${namelist[${count}]}")
        done
        binindex=$(
            DIALOGRC="$dialogrc" dialog --colors --stdout \
            --backtitle "$longname v$ver" --ok-label ' Select ' \
            --cancel-label ' Exit ' --menu 'Select Setup Script' 0 0 0 "${menu[@]}"
        )
        if [[ $? != 0 ]]; then
            clear; exitcancel
        fi
        clear
        let binindex-=countfrom
        ;;
esac

# Run $bin according to its flag.
bin=($(eval echo "${binlist[${binindex}]}"))
case ${flaglist[$binindex]} in
    # *C*onsole programs.
    [Cc])
        # If $bin is a login shell, it might `exec' cdm again, causing an endless
        # loop. To solve this problem, export $CDM_SPAWN when `exec'ing $bin and
        # only let the shell automatically `exec' cdm when $CDM_SPAWN is not set.
        # See also the example shell profile file shipped with the cdm package.

        # Also untrap SIGINT and SIGTSTP before spawning process: If this is not
        # done, any child process of any child (bash) shell will completely
        # ignore SIGINT, which is rather confusing, and cannot be undone.

        trap - SIGINT SIGTSTP
        CDM_SPAWN=$$ exec "${bin[@]}"
        ;;


esac

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