commit 7772d1930cf13103ff09fcbfcb6e3f6e2377e91a
Author: gd <gechandev@gmail.com>
Date:   Wed Aug 25 18:31:43 2021 +0300

    init

diff --git a/LICENSE.md b/LICENSE.md
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+MIT License
+
+Copyright (c) 2021 gd <http://nixhacks.net/interact>
+
+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.
diff --git a/README.md b/README.md
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+# Interact — Bash powered interactive interfaces
+
+**Interact** — is Bash functions library that implements some interactive elements like menus, checkboxes and others.
+
+You can use Interact instead of Whiptail and Dialog. Interact depends only Bash native commands and basic utils.
+
+# Usage
+
+Clone [lib/interact.bash](lib/interact.bash) in your project and source it:
+
+```shell
+source lib/*
+
+# do something
+```
+
+# Functions
+
+## menu
+
+Simple menu. Returns string with an item as `SELECTED_ITEM`. Navigation keys: `HJKL` (vim-style), arrow keys and `[`, `]`.
+
+![menu](images/menu.gif)
+
+Usage:
+
+```shell
+menu "${array[@]}"
+echo "$SELECTED_ITEM"
+```
+
+Demo script: [menu.sh](menu.sh).
+
+You can override default help text and prompt via variables:
+
+```
+MENU_PROMPT   -- string with prompt message;
+MENU_INDENT   -- string with intentation chars;
+MENU_HELP     -- string with help message.
+```
+
+## checklist
+
+Checklist. Returns array of checked items as `CHECKED_ITEMS`. Mostly same as menu, but needed changes. Features: automove to next item, check/uncheck items, variables supported too.
+
+![checklist](images/checklist.gif)
+
+Syntax:
+
+```shell
+checklist "${array[@]}"
+echo "${CHECKED_ITEMS[@]}"
+```
+
+Demo script: [checklist.sh](checklist.sh).
+
+Varisables:
+```
+CHECK_PROMPT -- string with prompt message;
+CHECK_INDENT -- string with intentation chars;
+CHECK_HELP   -- string with help message.
+```
+
+## messagebox
+
+Just screen with text message. Press any key to close it.
+
+Usage:
+
+```shell
+MSGBOX_TITLE='My title'
+messagebox 'My message'
+```
+
+Demo script: [messagebox.sh](messagebox.sh).
+
+Varisbles:
+```
+MSGBOX_TITLE    -- title (centered and bold);
+MSGBOX_WIDTH    -- terminal width. Default: 75 cols;
+MSGBOX_HELP     -- help message.
+```
+
+## yesno
+
+Yes/No dialog. You can type Y or N or select item in menu.
+
+Usage:
+
+```shell
+if yesno "Question?\n"; then
+  do_something
+else
+  do_nothing
+fi
+```
+
+Demo script: [yesno.sh](yesno.sh).
+
+Variables:
+```
+ASSUME_YES  -- skip dialog, return "Yes";
+YN_INDENT   -- indent;
+YN_HELP     -- help text.
+```
+
+# License
+
+[MIT License :)](LICENSE.md)
diff --git a/checklist.sh b/checklist.sh
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+#!/usr/bin/env bash
+
+source lib/*
+
+items=(
+    "first item"
+    "second item"
+    "third item"
+    "some another item" )
+
+checklist "${items[@]}"
+
+__text() {
+    echo "Checked items is:"
+    for item in "${CHECKED_ITEMS[@]}"; do
+        echo -e " - $item"
+    done
+}
+
+messagebox "$(__text)"
diff --git a/images/checklist.gif b/images/checklist.gif
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diff --git a/images/menu.gif b/images/menu.gif
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diff --git a/lib/interact.bash b/lib/interact.bash
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--- /dev/null
+++ b/lib/interact.bash
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+#!/usr/bin/env bash
+#   _
+#  | |       _                             _
+#  | |____ _| |_ _____  ____ _____  ____ _| |_
+#  | |  _ (_   _) ___ |/ ___|____ |/ ___|_   _)
+#  | | | | || |_| ____| |   / ___ ( (___  | |_
+#  |_|_| |_| \__)_____)_|   \_____|\____)  \__)
+#
+#  Bash powered interactive interfaces.
+#
+#  Interact is Bash functions library that implements some
+#  interactive elements like menus, checkboxes and others.
+#  You can use Interact instead of Whiptail and Dialog.
+#  Interact depends only Bash native commands and basic utils.
+
+menu() {
+    # Interactive menu
+    #
+    # Return string SELECTED_ITEM from array.
+    # Array must be passed as argument.
+    #
+    # Variables:
+    #   MENU_PROMPT -- string with prompt message;
+    #   MENU_INDENT -- string with intentation chars;
+    #   MENU_HELP   -- string with help message.
+
+    local menu_items=("$@") # array of items
+    local inp=              # reset input
+    local pos=0             # initial cursor position
+
+    tput smcup      # save screen contents
+    tput civis      # hide cursor
+
+    while [[ ! "$inp" =~ [qQ] ]]; do
+        clear  # clear screen
+
+        if [ "$MENU_PROMPT" ]
+        then echo -e "$MENU_PROMPT"
+        else echo -e "Select item:\n"
+        fi
+
+        # Print menu items
+        for i in "${!menu_items[@]}"; do
+            [ "$MENU_INDENT" ] && echo -en "$MENU_INDENT"
+            # Highlight selected item (invert colors)
+            if [ $i -eq $pos ]
+            then echo -e "> \e[7m${menu_items[${i}]}\e[27m"
+            else echo -e "  ${menu_items[${i}]}"
+            fi
+        done
+
+        # Print help text
+        if [ ! "$MENU_HELP" ]; then
+        tput cup $(tput lines) 0
+        echo -en \
+        "\e[7mUse HJKL or arrow keys to move, Enter to select, q to quit\e[27m"
+        tput home
+        else echo -e "$MENU_HELP"
+        fi
+
+        # Read input (including arrow keys)
+        inp=
+        local escape_char=$(printf "\u1b")
+        read -r -s -n 1 inp # get 1 character
+        # Read 2 more chars
+        if [[ $inp == $escape_char ]]; then read -r -s -n 2 inp; fi
+
+        case "$inp" in
+            [[hHjJ]|'[A'|'[D' )  pos=$(( $pos - 1 ))   ;; # move up
+            []kKlL]|'[B'|'[C' )  pos=$(( $pos + 1 ))   ;; # move down
+            '' )  SELECTED_ITEM="${menu_items[${pos}]}"; break  ;; # enter
+        esac
+
+        # Jump to last item if user press "up" when pos=0 and vice versa
+        if [ $pos -lt 0 ]; then pos=$(( ${#menu_items[@]} - 1 )); fi
+        if [ $pos -gt $(( ${#menu_items[@]} - 1 )) ]; then pos=0; fi
+    done
+
+    tput rmcup  # restore screen contents
+    tput cnorm  # show terminal cursor
+}
+
+checklist() {
+    # Interactive checklist
+    #
+    # Return string CHECKED_ITEMS from array.
+    # Array must be passed as argument.
+    #
+    # Variables:
+    #   CHECK_PROMPT -- string with prompt message;
+    #   CHECK_INDENT -- string with intentation chars;
+    #   CHECK_HELP   -- string with help message.
+
+    local checklist_items=("$@") # array of items
+    local inp=              # reset input
+    local pos=0             # initial cursor position
+
+    tput smcup      # save screen contents
+    tput civis      # hide terminal cursor
+
+    while [[ ! "$inp" =~ [qQ] ]]; do
+        clear  # clear screen
+
+        if [ "$CHECK_PROMPT" ]
+        then echo -e "$CHECK_PROMPT"
+        else echo -e "Check items:\n"
+        fi
+
+        # Print menu items
+        for i in "${!checklist_items[@]}"; do
+            [ "$CHECK_INDENT" ] && echo -en "$CHECK_INDENT"
+
+            if [[ "${checked[@]}" =~ "${checklist_items[${i}]}" ]]
+            then marker="[x] "
+            else marker="[ ] "
+            fi
+
+            # Highlight selected item (invert colors)
+            if [ $i -eq $pos ]
+            then echo -e "> \e[7m${marker}${checklist_items[${i}]}\e[27m"
+            else echo -e "  ${marker}${checklist_items[${i}]}"
+            fi
+        done
+
+        # Print help text
+        if [ ! "$CHECK_HELP" ]; then
+        tput cup $(tput lines) 0
+        echo -en \
+        "\e[7mUse HJKL or arrow keys to move, Enter to check, q to quit\e[27m"
+        tput home
+        else echo -e "$CHECK_HELP"
+        fi
+
+        # Read input (including arrow keys)
+        inp=
+        local escape_char=$(printf "\u1b")
+        read -r -s -n 1 inp # get 1 character
+        # Read 2 more chars
+        if [[ $inp == $escape_char ]]; then read -r -s -n 2 inp; fi
+
+        case "$inp" in
+            [[hHjJ]|'[A'|'[D' )  pos=$(( $pos - 1 ))   ;; # move up
+            []kKlL]|'[B'|'[C' )  pos=$(( $pos + 1 ))   ;; # move down
+            '' )
+                # Check / uncheck items
+                if [[ "${checked[@]}" =~ "${checklist_items[${pos}]}" ]]
+                then
+                    # Uncheck item
+                    checked=( "${checked[@]/${checklist_items[${pos}]}}" )
+                else
+                    # Check new item
+                    checked+=("${checklist_items[${pos}]}")
+                fi
+                # Automove cursor
+                [ $pos -lt $(( ${#checklist_items[@]} - 1 )) ] \
+                && pos=$(( $pos + 1 ));;
+        esac
+
+        # Jump to last item if user press "up" when pos=0 and vice versa
+        if [ $pos -lt 0 ]; then pos=$(( ${#checklist_items[@]} - 1 )); fi
+        if [ $pos -gt $(( ${#checklist_items[@]} - 1 )) ]; then pos=0; fi
+    done
+
+    # Remove blank items from array
+    for item in "${checked[@]}"; do
+        if [[ "$item" != "" ]]; then
+            CHECKED_ITEMS+=("$item")
+        fi
+    done
+
+    clear       # clear screen
+    tput rmcup  # restore screen contents
+    tput cnorm  # show terminal cursor
+}
+
+messagebox() {
+    # Message box
+    #
+    # Variables:
+    #   MSGBOX_TITLE    -- title (centered and bold);
+    #   MSGBOX_WIDTH    -- terminal width. Default: 75 cols;
+    #   MSGBOX_HELP     -- help message.
+    tput smcup      # save screen contents
+    tput civis  # hide terminal cursor
+    clear       # clear screen
+
+    local w=""
+    [ "$MSGBOX_WIDTH" ] && w="$MSGBOX_WIDTH" || w=75
+
+    if [ "$MSGBOX_TITLE" ]; then
+        local hw=$(( ( ( $w - ${#MSGBOX_TITLE} ) - 2 ) / 2 ))
+        local chars=0
+        local filler=""
+        while [ $chars -ne $hw ]; do filler+=" "; let chars++; done
+        MSGBOX_TITLE=$(tr '[:lower:]' '[:upper:]' <<< ${MSGBOX_TITLE})
+        echo -e "$filler \e[1m$MSGBOX_TITLE\e[0m $filler"
+    fi
+
+    echo -e "$@" #| fmt --width="$w" # diplay message
+
+    if [ "$MSGBOX_HELP" ]; then
+        echo -e "$MSGBOX_HELP"
+    else
+        tput cup $(tput lines) 0
+        echo -en "\e[7mPress any key to quit\e[27m"
+        tput home
+    fi
+
+    read -r -s -n 1 inp
+    case "$inp" in
+        *       )   clear -x; tput rmcup; tput cnorm; return 0;;
+    esac
+}
+
+yesno() {
+    # Yes/No interactive dialog
+    #
+    # Variales:
+    #   ASSUME_YES  -- skip dialog, return "Yes";
+    #   YN_INDENT   -- indent;
+    #   YN_HELP     -- help text.
+
+    [ "$ASSUME_YES" ] && return 0
+
+    tput smcup  # save screen contents
+    tput civis  # hide terminal cursor
+
+    local pos=0
+    local yn=( Yes No )
+    local answer=
+    local prompt="$@"
+
+    while [[ ! "$inp" =~ [qQ] ]]; do
+        clear
+
+        if [ "$prompt" ]
+        then echo -e "$prompt"
+        else echo -e "Continue?\n"
+        fi
+
+        for i in "${!yn[@]}"; do
+            [ "$YN_INDENT" ] && echo -en "$YN_INDENT"
+
+            if [ $i -eq $pos ]
+            then echo -en "> \e[7m${yn[${i}]}\e[27m\t"
+            else echo -en "  ${yn[${i}]}\t"
+            fi
+        done
+
+        if [ "$YN_HELP" ]; then
+            echo -en "$YN_HELP"
+        else
+            tput cup $(tput lines) 0
+            echo -en "\e[7mY - yes, N - no, q to qiut\e[27m"
+            tput home
+        fi
+
+        # Read input (including arrow keys)
+        local inp=
+        local escape_char=$(printf "\u1b")
+        read -r -s -n 1 inp # get 1 character
+        # Read 2 more chars
+        if [[ $inp == $escape_char ]]; then read -r -s -n 2 inp; fi
+
+        case "$inp" in
+            [[hHjJ]|'[A'|'[D' )  pos=$(( $pos - 1 ))   ;; # move up
+            []kKlL]|'[B'|'[C' )  pos=$(( $pos + 1 ))   ;; # move down
+            [yY]              )  answer=Yes; break     ;;
+            [nN]              )  answer=No;  break     ;;
+            '' ) answer="${yn[${pos}]}"; break  ;; # enter
+        esac
+
+        # Jump to last item if user press "up" when pos=0 and vice versa
+        if [ $pos -lt 0 ]; then pos=$(( ${#yn[@]} - 1 )); fi
+        if [ $pos -gt $(( ${#yn[@]} - 1 )) ]; then pos=0; fi
+    done
+
+    case $answer in
+        Yes) answer=0;;
+        No) answer=1;;
+    esac
+
+    tput rmcup  # restore screen
+    tput cnorm  # show cursor
+
+    return $answer  # return exit code
+}
diff --git a/menu.sh b/menu.sh
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+++ b/menu.sh
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+#!/usr/bin/env bash
+
+source lib/*
+
+items=(
+    "first item"
+    "second item"
+    "third item"
+    "some another item" )
+
+menu "${items[@]}"
+messagebox "Selected item is: $SELECTED_ITEM"
diff --git a/messagebox.sh b/messagebox.sh
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--- /dev/null
+++ b/messagebox.sh
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+#!/usr/bin/env bash
+
+source lib/*
+
+MSGBOX_TITLE="MIT License"
+
+message="$(cat << EOF
+Copyright (c) 2021 gd <http://nixhacks.net/nexclamation>
+
+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.
+EOF
+)"
+
+messagebox "$message"
diff --git a/yesno.sh b/yesno.sh
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--- /dev/null
+++ b/yesno.sh
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+#!/usr/bin/env bash
+
+source lib/*
+
+if yesno "Are you okay?\n"
+then messagebox "=)"
+else messagebox "=("
+fi