dropdownterminal

#!/bin/bash
# Make sure to 'chmod +x' this, and mv it in your path.

# Quick dl command:
#$ wget https://gist.githubusercontent.com/romgrk/0ba7a864a4e6c76eefd3/raw/92015b98899d77ab908d4b90e67b4fcfd39ad1d6/dropdownterminal && chmod +x ./dropdownterminal

# Recommended invocation: (interactive mode)
#$ ./dropdownterminal -i

func_dropdownterminal () {
local USAGE="
Usage:
  $0                              help
  $0 [options] [key]              key range (datatype)
  $0 [options] [key] [value]      set value of key

Options:
  -h       help
  -l       list keys
  -i       interactive mode

Shortkeys: Keys:
  h        terminal-height
  height   terminal-height
  fg       foreground-color
  bg       background-color
  a        transparency-level
  alpha    transparency-level
  fx       opening-animation-time
  fxe      enable-animation
  scroll   scrollbar-visible
  custom   custom-command

Env:
  DROPDOWN_DIR    (default ~/.local/share/gnome-shell/extensions)
  DROPDOWN_SCHEMA (default org.zzrough.gs-extensions.drop-down-terminal)
"
    if [[ $# -eq 0 ]]; then
        printf "%s\n" "$USAGE"
        exit 0
    fi

    local DIR SCHEMA;
    DIR=${DROPDOWN_DIR:="$HOME/.local/share/gnome-shell/extensions"}
    DIR="$DIR/drop-down-terminal@gs-extensions.zzrough.org"
    SCHEMA=${DROPDOWN_SCHEMA:="org.zzrough.gs-extensions.drop-down-terminal"}

    print_usage () { printf "%s\n" "$USAGE"; }
    list_keys () { gsettings --schemadir $DIR list-keys $SCHEMA $1 $2; }
    set_key () { 
        local v=`gsettings --schemadir $DIR set $SCHEMA $1 $2`
        if [[ $? -eq 0 ]]; then
            exit 0
        else
            exit 1
        fi; }
    get_key () { 
        local v=`gsettings --schemadir $DIR get $SCHEMA $1`
        if [[ $? -eq 0 ]]; then
            printf "%s" $v
            exit 0
        else
            printf ""
            exit 1
        fi; }
    get_type () { 
        local v=`gsettings --schemadir $DIR range $SCHEMA $1`
        if [[ $? -eq 0 ]]; then
            printf "%s" $v
            exit 0
        else
            printf ""
            exit 1
        fi; }
    expand_key () { 
        local k=$(printf "%s\n" "$USAGE" | sed -r -n -e 's/^\s+'$1'\s+//p')
        [[ -z $k ]] && k="$1"; printf "$k"; }

    esc() { [[ -n $2 ]] && printf "\e[${1}m$2\e[0m" || printf "\e[${1}m"; }
    xfg() { esc "38;5;$1"; }
    xbg() { esc "48;5;$1"; }
    rst()  { esc '0' "$@"; }
    bold() { esc '1:97' "$@"; }
    comment() { esc '38;5;242' "$@"; }
    bval() { esc '0;47;34' "$@"; }
    inputfd() { esc '38;5;160;48;5;250' "$@"; }
    inputhd() { esc '38;5;124;48;5;236' "$@"; }
    hl() { esc '1;91' "$1"; printf ' '; printf "%s " "${@:2}"; }

    rep() { [[ $# -eq 1 || ${#2} -lt 1 ]] && printf "%${1}s" || (printf "%${1}s" |tr " " "$2"); }

    # key being modified 
    local key
    # value of the key
    local val
    # datatype of the value
    local valType
    # unit of the value
    local unit
    # onscreen textBuffer
    local textBuffer

    local -A PROMPT
    PROMPT[title]='enter key'
    PROMPT[lead]='=> '
    PROMPT[size]=25
    PROMPT[msglead]=' ['
    PROMPT[msg]='esc exits, tab list keys'
    PROMPT[msgend]=']'

    prompt_reset () {
        PROMPT[title]='enter key'
        PROMPT[lead]='=> '
        PROMPT[size]=25
        PROMPT[msglead]=' ['
        PROMPT[msg]='esc exits, tab list keys'
        PROMPT[msgend]=']'
        key=''
        val=''
        unit=''
        textBuffer=''
    }

    prompt_display () {
        local len fill txt1 txt2; 
        tput cr
        tput el
        printf "$(rst)"
        printf "$(esc '0;38;5;254' [)"
        printf "$(esc '1;31')%s$(esc '0;38;5;254' ]) " ${PROMPT[title]}
        if [[ -n $textBuffer ]]; then
            len=PROMPT[size]
            if [[ -z $unit ]]; then
                fill=$(( len - ${#textBuffer} ))
                printf "$(inputfd)%s" $textBuffer
                printf $(rep $fill)
            else
                fill=$(( len - ${#textBuffer} - ${#unit} - 1 ))
                printf "$(inputfd)%s" $textBuffer
                printf $(rep $fill)
                printf "%s " $unit
            fi
        else
            len=$(( PROMPT[size] ))
            printf "$(inputfd)"
            printf "%${len}s"
        fi
        printf "$(xbg '238')"
        printf "$(xfg '247')"
        printf "${PROMPT[msglead]}"
        printf "%s" ${PROMPT[msg]} 
        printf "$(xbg '238')"
        printf "$(xfg '247')"
        printf "%s " ${PROMPT[msgend]}
        printf "$(rst)"
        tput cr
        tput cuf $(( ${#PROMPT[title]} + 3 + ${#textBuffer} ))
    }

    prompt_confirm () {
        # Key 
        if [[ -z $key ]]; then
            key=`expand_key $textBuffer`
            val=`get_key $key`
            if [[ -n $val ]]; then
                valType=`get_type $key`
                parse_value $val
                textBuffer=$val
                PROMPT[title]=$key
                PROMPT[msg]='<esc> go back'
            else
                PROMPT[title]='enter key'
                key=''
                val=''
                unit=''
                textBuffer=''
                PROMPT[msg]='No such key'
            fi
        # Value
        else
            local newval="$textBuffer"
            [[ $textBuffer =~ ^[0-9]+$ ]] && newval="${textBuffer}$unit"
            local res=`set_key $key $newval`
            if [[ $? -ne 0 ]]; then
                PROMPT[msg]=$(esc '91')'error'$(xfg '247')
            else
                PROMPT[msg]=$(esc '92')'ok'$(xfg '247')
                parse_value $newval
                textBuffer=$val
            fi
        fi
    }

    prompt_loop () {
        SELECT=""
        IFS=''     
        if [[ -n $key ]]; then
            textBuffer=$key
            key=''
            prompt_confirm
        fi
        prompt_display
        while [[ "$SELECT" != $'BBB' ]]; do
            read -s -r -N 1 SELECT
            if [[ "$SELECT" == $'\x0a' ]]; then 
                prompt_confirm
            elif [[ "$SELECT" == $'\t' ]]; then 
                echo ""
                local shorts=`echo $USAGE | sed -r -n -e '/^Short/,/^\s*$/ p'`
                while read -r k; do
                    if [[ $shorts =~ $k ]]; then
                        sed -r -n -e "/$k/ p" <<< $shorts
                    else
                        printf " (none)    %s\n" $k
                    fi
                done <<< "`list_keys`"
            elif [[ "$SELECT" == $'\e' ]]; then 
                if [[ -n $key ]]; then
                    prompt_reset
                else
                    exit 0
                fi
            elif [[ "$SELECT" == $'\x7f' ]]; then 
                local len=${#textBuffer}
                [[ $len -ne 0 ]] && textBuffer="${textBuffer:0:len-1}"
            else
                if [[ -n $key && "$SELECT" == $'j' ]]; then 
                    [[ $textBuffer =~ ^[0-9]+$ ]] && let "val -= 1"
                    textBuffer="$val"
                    prompt_confirm
                elif [[ -n $key && "$SELECT" == $'k' ]]; then 
                    [[ $textBuffer =~ ^[0-9]+$ ]] && let "val += 1"
                    textBuffer="$val"
                    prompt_confirm
                elif [[ "$SELECT" =~ [a-zA-Z0-9%\'] ]]; then
                    textBuffer+="$SELECT" 
                    [[ -n $key ]] && PROMPT[msg]='<esc> go back'
                fi
            fi
            [[ -n $key && -n $unit ]] && PROMPT[msg]+='; j/k -/+'
            prompt_display
        done
    }

    parse_value () {
        local newval=$1
        case $newval in   # $( arch ) returns machine architecture.
        *[0-9]%*) 
            newval=$(echo "$newval" | sed -e 's/[^0-9]//g')
            unit="%"
            val=$newval
            ;;
        *[0-9]px* )
            newval=$(echo "$newval" | sed -e 's/[^0-9]//g')
            unit='px'
            val=$newval
            ;;
        *\ [0-9]* ) 
            newval=$(echo "$newval" | sed -r -e 's/^.+ //g')
            unit=''
            val=$newval
            ;;
        +[0-9] )
            unit=''
            val=$newval
            ;;
        * )
            newval=${newval##\'}
            newval=${newval/%\'}
            unit=''
            val=$newval
        esac
    }

    local -A ARGV;
    ARGV[key]=0
    ARGV[value]=0
    ARGV[interactive]=0
    while getopts "ihl" opt; do
        case $opt in
            i)
                ARGV[interactive]=1
            ;;
            l)
                echo ""
                local shorts=`printf $USAGE | \sed -r -n -e '/^Short/,/^\s*$/ p'`
                while read -r k; do
                    if [[ $shorts =~ $k ]]; then
                        sed -r -n -e "/$k/ p" <<< $shorts
                    else
                        printf " (none)    %s\n" $k
                    fi
                done <<< "`list_keys`"
                exit 0;
            ;;
            h)
                printf "$(print_usage)\n"; exit 0;
            ;;
            \?)
                printf "Invalid option: $OPTARG; $OPTERR"
                printf "$(print_usage)\n"; exit 1;
            ;;
        esac
    done
    shift $(($OPTIND-1))

    if [[ $# -gt 0 ]]; then
        key=$1
        key=`expand_key $key`
    fi
    if [[ $# -gt 1 ]]; then
        val=$2
    fi
    
    if [[ ${ARGV[interactive]} -eq 1 ]]; then
        prompt_loop
        exit 0
    fi

    if [[ $# -eq 1  ]]; then
        val="`get_key $key`"
        [[ -z $val ]] && exit 1
        valType="`get_type $key`"
        echo -en " $(comment '=>') $(esc '38;5;202')$val"
        echo -e  " $(comment)$valType"
    else
        set_key $key "$val"
        exit $?
    fi
}
func_dropdownterminal $@
unset -f func_dropdownterminal