Wrapper script for the Vim Notes plugin

vnotes.sh

#!/usr/bin/env bash
#
# VimNotes: Wrapper script for the Vim Notes plugin
#
#   Version: 1.0
#
# Written by Kevin MacMartin <prurigro@gmail.com>
# Released under the MIT license
#

VIMNOTES_FOLDER=${VIMNOTES_FOLDER:="$HOME/Notes"}
NOTES_SUFFIX=${NOTES_SUFFIX:='txt'}

declare -a documents=()
max_docwidth=0
key="$1"

# Colour Scheme
[[ -t 1 ]] && {
    c_d=$'\e[1;30m'   # DARK GREY
    c_r=$'\e[1;31m'   # RED
    c_g=$'\e[1;32m'   # GREEN
    c_y=$'\e[1;33m'   # YELLOW
    c_b=$'\e[1;34m'   # BLUE
    c_m=$'\e[1;35m'   # VIOLET
    c_t=$'\e[1;36m'   # TEAL
    c_w=$'\e[1;37m'   # WHITE
    c_u=$'\e[1;4;37m' # UNDERLINE WHITE
    c_h=$'\e[1;41m'   # HIGHLIGHT RED
    c_c=$'\e[0m'      # DISABLES COLOUR
}

# open a doc
function open_note {
    printf '%s %s\n' "${c_y}Opening:" "$c_m${documents[$1]}$c_c"
    [[ -n "$tty_state" ]] \
        && stty "$tty_state"
    vim -c ":Note ${documents[$1]}"
    exit 0
}

function prompt {
    printf '%s ' "${c_w}Please choose a number from the list $c_d[$c_b$one_display-$upto$c_d] $c_d(${c_m}Q$c_w to quit$c_d)$c_w:$c_c"
}

function power {
    local number="$1" power="$2" total=1
    for (( x=0; x<"$power"; x++ )); do
        total=$(( total * number ))
    done
    printf '%s\n' "$total"
}

# Display help text
function help {
    script_name="${0//*\/}"
    printf '\n%s\n\n' "${c_m}VimNotes${c_w} - Wrapper script for the Vim Notes plugin$c_c"
    printf '%s\n'     "${c_b}USAGE$c_c"
    printf '  %s\n\n' "$c_y$script_name $c_d[${c_r}OPTION$c_d] ${c_g}PATTERN$c_c"
    printf '%s\n'     "${c_b}OPTIONS$c_c"
    printf '  %-38s%s\n'   "$c_w-c$c_d|$c_w--create$c_c" "create new note if one with the same name doesn't exist"
    printf '  %-38s%s\n\n' "$c_w-h$c_d|$c_w--help$c_c"   "show this help text"
    exit 0
}

# Function to process key codes
function getkeycode {
    while read -r; do
        [[ "$REPLY" =~ ^[0-9][0-9]*\ (.*)$ ]] && {
            printf '%s\n' "${BASH_REMATCH[1]}"
            break
        }
    done <<< "$1"
}

# Define Q, q, and Return respectively
alpha_Q=$(getkeycode "$(printf '%s' 'Q' | od -t o1)")
alpha_q=$(getkeycode "$(printf '%s' 'q' | od -t o1)")
key_cr=$(getkeycode "$(printf '\n' | od -t o1)")

[[ -d "$VIMNOTES_FOLDER" ]] \
    || install -d "$VIMNOTES_FOLDER"

# Parse for command line arguments
case $1 in
    -c|--create)
        if [[ -n "$2" ]]; then
            vim -c ":Note $2"
            exit $?
        else
            printf '%s %s\n' "${c_r}ERROR:$c_c" 'No name given for the new note' >&2
            exit 1
        fi
        ;;
    -h|--help)
        help
        ;;
esac

# Build the list of notes and track the longest document name
if [[ -n "$key" ]]; then
    for each in "$VIMNOTES_FOLDER"/*."$NOTES_SUFFIX"; do
        [[ "$each" =~ $key ]] && {
            each="${each/*\/}"
            each="${each/\.$NOTES_SUFFIX}"
            documents=( "${documents[@]}" "$each" )
            (( max_docwidth < ${#each} )) \
                && max_docwidth=${#each}
        }
    done
else
    for each in "$VIMNOTES_FOLDER"/*."$NOTES_SUFFIX"; do
        each="${each/*\/}"
        each="${each/\.$NOTES_SUFFIX}"
        documents=( "${documents[@]}" "$each" )
        (( max_docwidth < ${#each} )) \
            && max_docwidth=${#each}
    done
fi

# Exit with an error if the list of notes is empty
(( ${#documents[*]} )) || {
    printf '%s\n' "Can't find $key"
    exit 1
}

if (( ${#documents[*]} == 1 )); then
    [[ "${documents[0]}" =~ ^\ *\*\ *$ ]] && {
        printf '%s %s\n' "${c_r}ERROR:$c_c" "${c_w}No notes in $c_m$VIMNOTES_FOLDER$c_c" >&2
        exit 1
    }
    # Open the single document matching the search term
    open_note 0
else
    # Display the multiple matching documents (or the full list if no term was passed)
    screen_width=$(tput cols)
    if [[ -n "$screen_width" ]]; then
        maxcolumns=0
        while (( 1 )); do
            (( (( (( max_docwidth + 8 )) * maxcolumns )) > screen_width )) && {
                (( maxcolumns-- ))
                break
            }
            (( maxcolumns++ ))
        done
    else
        maxcolumns=3
    fi

    # Get the number of values
    upto=${#documents[@]}

    # Calculate the number of digits in $upto
    digits=1
    while (( 1 )); do
        digits_power=$(power 10 $digits)
        (( digits++ ))
        (( (( upto / (( 10 * digits_power )) )) < 1 )) \
            && break
    done
    unset digits_power

    # Draw the list
    printf '\n'
    cnt=1
    for (( x=0; x<${#documents[*]}; x++ )); do
        count_display=$(printf "%${digits}s" "$((x+1))")
        count_display="${count_display//\ /0}"
        (( x )) || one_display="$count_display"
        printf "$c_b[%${digits}s]$c_c$c_u%$(( max_docwidth + 1 ))s$c_c" "$count_display" "${documents[$x]}"
        if (( (( cnt + 1 )) > maxcolumns )); then
            cnt=1
            printf '\n'
        else
            (( cnt++ ))
            printf '%4s' ' '
            (( (( x + 1 )) >= ${#documents[*]} )) \
                && printf '\n'
        fi
    done
    unset cnt
    printf '\n'

    # Initialize the interactive entry line
    tput init
    prompt
    tput sc
    tput rc

    # Save the tty state
    tty_state="$(stty -g)"
    # Trap a function to restore the tty on exit
    trap 'stty "$tty_state"; exit' SIGINT SIGQUIT SIGTERM
    # Begin to capture input
    stty cs8 -icanon -echo min 1 time 1
    stty intr '' susp ''

    # Loop the input loop and a set of input testing commands
    while (( 1 )); do
        # The input loop which accepts 0-9, q/Q/Ctrl-C to quit, Backspace and Enter
        value=''
        while (( 1 )); do
            # Break out of the loop if $value is as long as the largest number to select from
            (( ${#value} >= digits )) \
                && break

            # Wait for and accept input
            keypress=$(getkeycode "$(dd bs=10 count=1 2> /dev/null | od -t o1)")
            case "$keypress" in
                '177'|'010'|'033 133 063 176')
                    # Backspace
                    [[ -n "$value" ]] && value="${value:0:$((${#value}-1))}"
                ;;
                $alpha_q|$alpha_Q) value='-1'; break ;;
                $key_cr) [[ -n "$value" ]] && break ;;
                '003') value='-1'; break ;; # Ctrl-C
                '060') value="${value}0" ;; # 0
                '061') value="${value}1" ;; # 1
                '062') value="${value}2" ;; # 2
                '063') value="${value}3" ;; # 3
                '064') value="${value}4" ;; # 4
                '065') value="${value}5" ;; # 5
                '066') value="${value}6" ;; # 6
                '067') value="${value}7" ;; # 7
                '070') value="${value}8" ;; # 8
                '071') value="${value}9" ;; # 9
            esac

            # Redraw the input line with an up to date $value
            tput el1
            tput cr
            prompt
            printf '%s' "$value"
        done

        # Quit if input was given to do so
        (( value == -1 )) && {
            printf '\n%s\n' "${c_r}Quitting!$c_c"
            [[ -n "$tty_state" ]] \
                && stty "$tty_state"
            exit 0
        }

        # Evaluate the numbers and exit if valid, otherwise display an error and start again
        if (( 1 <= value && value <= upto )); then
            printf '\n'
            open_note $(( value - 1 ))
        else
            tput el1
            tput cr
            printf '%s' "$c_h Invalid number: $value $c_c"
            sleep .8
            tput el1
            tput cr
            prompt
        fi
    done
fi

# Restore the tty state
[[ -n "$tty_state" ]] \
    && stty "$tty_state"