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bash_ui.sh
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bash_ui.sh
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# MIT license, explained here:
# http://www.tldrlegal.com/l/mit
# Copyright (c) 2020 Cefan Daniel Rubin
#
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
# Latest:
# https://github.com/cdrubin/bash_ui
if [ "${BASH_VERSINFO[0]}" -lt 4 ]; then
echo "bash_ui.sh requires bash version 4 or greater"
exit
fi
declare -A _CHOICES
declare _CHOICES_ORDER
declare _NUMBER_OF_CHOICES
declare _HIGHLIGHTED_CHOICE
function _initialise() {
local CHOICE_NUMBER=0
local PARTS=''
_CHOICES=()
_CHOICES_ORDER=()
#unset _CHOICES; declare -A _CHOICES
#unset _CHOICES_ORDER; declare _CHOICES_ORDER
local IFS=$'\n';
for ENTRY in $CHOICES; do
IFS='=' PARTS=( $ENTRY )
local KEY="${PARTS[0]}"; local VALUE="${PARTS[1]}"
if [ "$VALUE" == "" ]; then VALUE="$KEY"; fi
_CHOICES["$KEY"]=$VALUE
_CHOICES_ORDER+=( "$KEY" )
done
_NUMBER_OF_CHOICES="${#_CHOICES[@]}"
}
function set_y() {
exec < /dev/tty
local OLDSTTY=$(stty -g)
stty raw -echo min 0
echo -en "\033[6n" > /dev/tty
IFS=';' read -r -d R -a pos
stty $OLDSTTY
_Y=$((${pos[0]:2} - 1))
}
function _choose_refresh() {
echo -e "\033[${_TOP};0H"
local NUM=1
for ENTRY in "${_CHOICES_ORDER[@]}"; do
if [ $NUM -eq $_HIGHLIGHTED_CHOICE ]; then
echo -n -e "\033[7m"; echo -n "$ENTRY"; echo -e "\033[0m"
else
echo -n -e "\033[K"; echo $ENTRY
fi
((NUM++))
done
}
# if CHOSEN key has a value with newlines (when refer to multiple keys) then update CHOSEN to all of those keys
function _chosen_handle_multiple_valuekeys() {
local KEY="$CHOSEN"
local VALUE=${_CHOICES[$KEY]}
# if the value at this key contains newlines then convert to an array of keys
if [[ "$VALUE" == *"\n"* ]]; then
local DELIMITER="\n"
local ORIG=$VALUE$DELIMITER
CHOSEN=()
while [[ $ORIG ]]; do
CHOSEN+=( "${ORIG%%"$DELIMITER"*}" );
ORIG=${ORIG#*"$DELIMITER"};
done;
fi
}
# convert a single key or array of keys to their corresponding values
function _chosen_keys_to_values() {
local KEYS="${CHOSEN[@]}"
CHOSEN=()
local IFS=$'\n'
for KEY in ${KEYS[@]}; do
CHOSEN+=( ${_CHOICES[$KEY]} )
done;
}
function _chosen_to_newlines_output() {
local OUTPUT
printf -v OUTPUT "%s\n" "${CHOSEN[@]}"
CHOSEN=${OUTPUT%?}
}
function choose_one() {
_initialise
_HIGHLIGHTED_CHOICE=1
for ENTRY in "${_CHOICES_ORDER[@]}"; do
echo $ENTRY
done
set_y
_TOP=$((_Y - _NUMBER_OF_CHOICES))
_choose_refresh
# kwy handling thanks to: https://stackoverflow.com/a/56200043
while read -sn1 key; do
read -sn1 -t 0.0001 k1; read -sn1 -t 0.0001 k2; read -sn1 -t 0.0001 k3
key+=${k1}${k2}${k3}
case "$key" in
$'\e[A'|$'\e0A') # up arrow
if [ $_HIGHLIGHTED_CHOICE -gt 1 ]; then ((_HIGHLIGHTED_CHOICE--)); fi; _choose_refresh;;
$'\e[B'|$'\e0B') # down arrow
if [ $_HIGHLIGHTED_CHOICE -lt $_NUMBER_OF_CHOICES ]; then ((_HIGHLIGHTED_CHOICE++)); fi; _choose_refresh;;
'') # whitespace character
break
esac
done
# CHOSEN set to the selected key
CHOSEN=${_CHOICES_ORDER[((_HIGHLIGHTED_CHOICE-1))]}
_chosen_handle_multiple_valuekeys
_chosen_keys_to_values
_chosen_to_newlines_output
}
function choose_multiple() {
_initialise
_HIGHLIGHTED_CHOICE=1
# add 'submit' faux last choice
_CHOICES_ORDER+=( ">" )
((_NUMBER_OF_CHOICES++))
# associative array, indexed by choice key, when set it has been selected
declare -A CHOSEN_KEYS
# print choices for the first time
for ENTRY in "${_CHOICES_ORDER[@]}"; do
echo "$ENTRY"
done
set_y
_TOP=$((_Y - _NUMBER_OF_CHOICES ))
_choose_refresh
# kwy handling thanks to: https://stackoverflow.com/a/56200043
while read -sn1 key; do
read -sn1 -t 0.0001 k1; read -sn1 -t 0.0001 k2; read -sn1 -t 0.0001 k3
key+=${k1}${k2}${k3}
case "$key" in
$'\e[A'|$'\e0A') # up arrow
if [ $_HIGHLIGHTED_CHOICE -gt 1 ]; then ((_HIGHLIGHTED_CHOICE--)); fi; _choose_refresh;;
$'\e[B'|$'\e0B') # down arrow
if [ $_HIGHLIGHTED_CHOICE -lt $_NUMBER_OF_CHOICES ]; then ((_HIGHLIGHTED_CHOICE++)); fi; _choose_refresh;;
'') # whitespace character
# if last entry '> ...' was selected stop
if [ $_HIGHLIGHTED_CHOICE -eq $_NUMBER_OF_CHOICES ]; then
unset CHOSEN;
for i in "${_CHOICES_ORDER[@]}"; do
if [ -v "CHOSEN_KEYS[$i]" ]; then
CHOSEN+=( "$i" )
fi
done
_chosen_keys_to_values
_chosen_to_newlines_output
break
fi
unset CHOSEN; CHOSEN=${_CHOICES_ORDER[(($_HIGHLIGHTED_CHOICE - 1))]}
_chosen_handle_multiple_valuekeys
for i in "${CHOSEN[@]}"; do
if [ -v "CHOSEN_KEYS[$i]" ]; then
unset CHOSEN_KEYS["$i"]
else
CHOSEN_KEYS["$i"]="chosen"
fi
done
# update the last entry to show selection
local _DISPLAY_CHOSEN=">"
for i in "${_CHOICES_ORDER[@]}"; do
if [ -v "CHOSEN_KEYS[$i]" ]; then
_DISPLAY_CHOSEN+=" $i"
fi
done
_CHOICES_ORDER[$((_NUMBER_OF_CHOICES - 1))]=$_DISPLAY_CHOSEN
_choose_refresh
esac
done
}