A daily log of experiences (daybook, journal), a personal organizer or an appointment diary to be run in a linux terminal. Totally written in shell script. Support AES-256 symmetric encryption through 7-Zip.

diario

#!/bin/zsh
##############################################################################
# DIÁRIO NUM TERMINAL
#
# Copyright (C) 2023, 2024, 2025 Daniel Dias Rodrigues
#
# Source code is available at:
#     https://gist.github.com/nerun/25bad2359b873351a65c40b1d425766f
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the Creative Commons Zero 1.0 Universal (CC0 1.0) Public
# Domain Dedication (https://creativecommons.org/publicdomain/zero/1.0/).
#
# INSTALLATION:
#   Copy "diario" to one of:
#       ~/.local/bin
#       /usr/bin
#       /usr/local/bin
##############################################################################

# Settings
journal="$HOME/.diario"
editor="nano"
software_title="Diário num terminal"
crypt_journal="journal.7z"

if [[ ! -d "$journal" ]]; then
    mkdir -p "$journal"
fi

about="
Copyright (C) 2023, 2024, 2025 Daniel Dias Rodrigues

Source code is available at:

 https://gist.github.com/nerun/25bad2359b873351a65c40b1d425766f

This program is free software; you can redistribute it and/or modify it under the terms of the Creative Commons Zero 1.0 Universal (CC0 1.0) Public Domain Dedication:

 https://creativecommons.org/publicdomain/zero/1.0
"

# Auxiliary function for selecting a record.
select_record() {
    local title="$1"
    local message="$2"
    
    # Create an array of items for the menu.
    local menu_items=()
    local records=($(find "$journal" -type f -not -name "$crypt_journal" | sort -r))
    
    for record in "${records[@]}"; do
        local filename=$(basename "$record")
        local preview=$(cut -c 1-46 "$record" 2>/dev/null | sed 's/[[:cntrl:]]//g')
        
        # If preview is empty, show "(empty)"
        if [[ -z "$preview" ]]; then
            preview="(vazio)"
        fi
        
        # Add to array: "filename" "preview"
        menu_items+=("$filename" "$preview")
    done

    if [[ ${#menu_items[@]} -eq 0 ]]; then
        dialog --clear --backtitle "$software_title" \
            --title "Nenhum Registro" \
            --msgbox "\nNão há registros disponíveis." 7 40
        echo ""
        return 1
    fi

    local selected_record=$(dialog --clear --backtitle "$software_title" \
        --title "$title" \
        --menu "$message" 17 72 10 \
        "${menu_items[@]}" \
        3>&1 1>&2 2>&3 3>&-)

    echo "$selected_record"
}

crypt(){
    # Use 7-ZIP with 7zAES:19, that means
    # AES-256 + (2^19) SHA-256 iterations in password to key function
    # encrypt = $crypt_journal and delete text files
    # decrypt = delete $crypt_journal
    if [[ "$2" = "Encriptar diário" ]]; then
        7za a -mhe=on -mx=0 -P"$1" $journal/$crypt_journal $journal/* >/dev/null

        if [[ -f $journal/$crypt_journal ]]; then
            find $journal -type f -not -name "$crypt_journal" -delete
        fi
    else
        # "$2" = "Decriptar diário"
        7za x -P"$1" $journal/$crypt_journal -o"$journal" >/dev/null

        if [[ $? = 0 ]]; then
            rm $journal/$crypt_journal
        else
            dialog --clear --backtitle "$software_title" \
                --title "Senha Incorreta" \
                --msgbox "\n A senha está incorreta!" 6 29
        fi
    fi
}

menu(){
    clear

    local records=($(find $journal -type f))

    if [[ ! "${records[@]}" =~ "$crypt_journal" ]]; then
        # Journal IS NOT encrypted
        if [[ ${#records[@]} > 0 ]]; then
            local num_registros="Foi encontrado 1 registro."

            if [[ ${#records[@]} > 1 ]]; then
                local num_registros="Foram encontrados ${#records[@]} registros."
            fi

            local choice=$(dialog --clear --backtitle "$software_title" \
                --title "Menu Principal" \
                --menu "\n$num_registros\n\nO que deseja fazer?" 15 40 4 \
                1 "Criar um novo registro" \
                2 "Editar e/ou Ler um registro" \
                3 "Apagar um registro" \
                4 "Encriptar diário" \
                5 "Sobre" \
                3>&1 1>&2 2>&3 3>&- )
                
                # "3>&1 1>&2 2>&3 3>&-" means:
                # 3>&1 opens a new file descriptor which points to stdout
                # 1>&2 redirects stdout to stderr
                # 2>&3 points stderr to stdout
                # 3>&- deletes the files descriptor 3 after the command has been
                # executed.
                
        else
            local choice=$(dialog --clear --backtitle "$software_title" \
                --title "Menu Principal" \
                --menu "\nNenhum registro foi encontrado.\n\nO que deseja fazer?" 12 40 4 \
                1 "Criar um novo registro" \
                5 "Sobre" \
                3>&1 1>&2 2>&3 3>&- )
        fi

        local crypt="Encriptar diário"
    else
        # Journal IS encrypted and MUST be decrypted first
        local choice=4
        local crypt="Decriptar diário"
    fi

    actions $choice $crypt
}

actions(){
    case $1 in
        1)
            $editor "$journal/$(date +%Y%m%d_%Hh%Mm%Ss)" && menu
            ;;

        2)
            local record=$(select_record "Escolha um registro para Editar e/ou Ler" "\nArquivos:")
            if [[ -n "$record" && "$record" != "$journal/" ]]; then
                $editor "$journal/$record"
            fi
            menu
            ;;

        3)
            local record=$(select_record "Escolha um registro para Apagar" "\nArquivos:")
            if [[ -n "$record" && "$record" != "$journal/" ]]; then
                rm -f "$journal/$record"
            fi
            menu
            ;;

        4)
            if [[ $2 = "Decriptar diário" ]]; then
                passphrase=$(dialog --clear --backtitle "$software_title" \
                    --title "$2" --insecure \
                    --passwordbox "\nFoi encontrado um diário encriptado.
Decripte-o primeiro.\n\nDigite a senha:" 11 45 \
                    3>&1 1>&2 2>&3 3>&- )

                if [[ $? = 1 ]]; then
                    exit
                else
                    crypt $(echo "$passphrase" | sha256sum | cut -d' ' -f1) "$2"
                    passphrase=''
                    menu
                fi
            else
                # $2 = "Encriptar diário"
                passphrase=$(dialog --clear --backtitle "$software_title" \
                    --title "$2" --insecure \
                    --passwordform "\nDefina uma senha a seguir." 11 45 3 \
                    "Senha:"  1 1 "" 1 9 31 0 \
                    "Repita:" 3 1 "" 3 9 31 0 \
                    3>&1 1>&2 2>&3 3>&- )

                if [[ $? = 1 ]]; then
                    menu
                else
                    if [[ "$(echo $passphrase | head -1)" =
                          "$(echo $passphrase | tail -1)" &&
                           $(echo $passphrase | wc -l) > 1 ]]; then
                        crypt "$(echo "$passphrase" | head -1 | sha256sum | cut -d' ' -f1)" "$2"
                        passphrase=''
                    else
                        dialog --clear --backtitle "$software_title" \
                            --title "Senhas não conferem" \
                            --msgbox "\nAs senhas digitadas não são iguais. Tente novamente." 7 31
                    fi

                    menu
                fi
            fi

            ;;

        5)
            dialog --clear --backtitle "$software_title" \
                --title "Sobre \"$software_title\"" \
                --msgbox "$about" 17 72

            menu

            ;;

        *)
            clear
            exit
            ;;

    esac
}

menu