bemenu-nb-todo.bash

#!/usr/bin/env bash

#########################
# bemenu-nb-todo
#
# Licence: GNU GPLv3
# Author: Tomasz Kapias
#
# Dependencies:
#   bemenu v0.6.23
#   bemenu-orange-wrapper
#   Nerd-Fonts
#   nb > v7.14.1
#   bash
#   GNU awk
#   sed
#   grep
#
#########################

shopt -s extglob

# locale
export LC_ALL="C.UTF-8"
export TZ=:/etc/localtime

# bemenu command
declare -a bemenu_cmd
bemenu_cmd=(bemenu)

# NB ENV: nb conf custom location
#export NBRC_PATH="$HOME"/.config/nb/nbrc
export NB_DEFAULT_EXTENSION=md
export NB_LIMIT=10000
# NB ENV: #top todos are pinned at the top of the listings
# priority for pinned items is currently broken: https://github.com/xwmx/nb/issues/341
export NB_PINNED_PATTERN="#top"

# nb command
declare -a nb_cmd
nb_cmd=(nb)

# Optional arguments $1, $2 & $3
declare notebook folder init_tag
# nb notebook's name, default is "home"
notebook="${1:-home}"
# dedicated folder, default is "todos"
folder="${2:-todos}"
# tag name for new todos, default is "bemenu-nb"
init_tag="${3:-todo}"

# to get the relative/short indicators
"${nb_cmd[@]}" use --no-color "$notebook" >/dev/null

# Variables
declare index title view state tags todo_id todo_path
index="0"
title=" NB TODO"
view="todos"
state=""
tags=""
todo_id=""
todo_path=""

header() {
	if [[ ! "$view" == "todos" ]]; then
		echo " Back to Todos"
	fi
	if [[ "$view" == "todos" ]]; then
		echo "󰣯 Filter by State$([[ -n "$state" ]] && echo ": ${state^}")"
		echo "󱤇 Filter by Tag(s)$([[ -n "$tags" ]] && echo ": $tags")"
		if [[ -n "$tags" ]] || [[ -n "$state" ]]; then
			echo "󰇾 Reset Filters"
		fi
	fi
	if [[ "$view" == "infos" ]]; then
		echo "󰗨 Delete Todo"
	fi
}

list() {
	header
	if [[ "$view" == "todos" ]]; then
		"${nb_cmd[@]}" todos --reverse --no-color "$notebook":"$folder"/ "$state" "$tags" 2>/dev/null |
			sed -r "s/^\[$folder\/([0-9]+)\][^\[]+(\[)/\{\1\}\t\2/g" # hiding indicators & brace id
	elif [[ "$view" == "state" ]]; then
		echo -e "open\nclosed"
	elif [[ "$view" == "tags" ]]; then
		"${nb_cmd[@]}" ls --no-color "$notebook":"$folder"/ --tags 2>/dev/null | /usr/bin/grep -Eo '^#.*'
	elif [[ "$view" == "infos" ]]; then
		"${nb_cmd[@]}" todo list --excerpt 500 --no-indicator --no-color "$notebook":"$folder"/"$todo_id" 2>/dev/null |
			sed -nr -e "s/^\[$folder\/([0-9]+)\]\s+(\[)/\{\1\} \2/" -e '2d' -e '/^##? /d;p' | awk 'NF'
	fi
}

back() {
	if [[ "$1" == " Back to Todos" ]]; then
		view="todos"
		todo_id=""
		todo_path=""
		index="0"
	else
		return 1
	fi
}

view_todo() {
	if [[ "$1" =~ ^\{[0-9] ]]; then
		view="infos"
		state=""
		tags=""
		todo_id=$(echo "$1" | sed -r -e 's/^\{([0-9]+)\}.+/\1/')
		todo_path=$("${nb_cmd[@]}" todo --no-color --no-id --no-indicator --path "$notebook":"$folder"/"$todo_id" 2>/dev/null)
		index="2"
	else
		return 1
	fi
}

view_filters() {
	if [[ "$1" =~ ^󰣯\ Filter\ by\ State ]]; then
		view="state"
		[[ "$state" == "open" ]] && index="2" || index="1"
	elif [[ "$1" =~ ^󱤇\ Filter\ by\ Tag ]]; then
		view="tags"
		index="1"
	else
		return 1
	fi
}

reset_filters() {
	if [[ "$1" == "󰇾 Reset Filters" ]]; then
		view="todos"
		state=""
		tags=""
		index="0"
	else
		return 1
	fi
}

add_todo() {
	if [[ ! "$1" =~ ^\{|^󰣯|^󱤇|^󰇾 ]]; then
		state=""
		tags=""
		todo_id=$("${nb_cmd[@]}" todo add --no-color "$notebook":"$folder"/ "$1" --tags="${init_tag}" 2>/dev/null |
			sed -r 's/.+\[todos\/([0-9]+).+/\1/')
		todo_path=$("${nb_cmd[@]}" todo --no-color --no-id --no-indicator --path "$notebook":"$folder"/"$todo_id" 2>/dev/null)
		view="infos"
		index="2"
	else
		return 1
	fi
}

filters() {
	if [[ "$1" =~ ^open|^closed ]]; then
		view="todos"
		state="$1"
		index="0"
	elif [[ "$1" =~ ^# ]]; then
		view="todos"
		tags="$(echo "$1" | tr '\n' ' ')"
		index="0"
	else
		return 1
	fi
}

delete_todo() {
	if [[ "$1" == "󰗨 Delete Todo" ]]; then
		"${nb_cmd[@]}" todo delete --force --no-color "$notebook":"$folder"/"$todo_id" >/dev/null
		view="todos"
		todo_id=""
		todo_path=""
		index="0"
	else
		return 1
	fi
}

chstate_todo() {
	if [[ "$1" =~ ^\{[0-9]+\}\ \[\ \] ]]; then
		"${nb_cmd[@]}" todo 'do' --no-color "$notebook":"$folder"/"$todo_id" >/dev/null
	elif [[ "$1" =~ ^\{[0-9]+\}\ \[x\] ]]; then
		"${nb_cmd[@]}" todo undo --no-color "$notebook":"$folder"/"$todo_id" >/dev/null
	else
		return 1
	fi
}

mod_tasks() {
	if [[ "$1" =~ ^-\ \[[\ x]\] ]]; then
		local pattern
		pattern=$(echo "$1" | sed 's/[]\/$*.^[]/\\&/g')
		if /usr/bin/grep -Eq -- "$pattern" "$todo_path" 2>/dev/null; then
			sed -i -e "/$pattern/ s/^\-\ \[\ \]/- [x]/" "$todo_path" \
				-e "/$pattern/ s/^\-\ \[x\]/- [ ]/" "$todo_path"
		elif /usr/bin/grep -Eq -- '## Tasks' "$todo_path" 2>/dev/null; then
			sed -i -e ':a' -e 'N;$! ba' -e "s/.*\(\n\)-\ [\[][\ x]\]\ [^\n]*/&\1$1/" "$todo_path"
		else
			echo -e "\n## Tasks\n\n${1}" >>"$todo_path"
		fi
	else
		return 1
	fi
}

mod_tags() {
	if [[ "$1" =~ ^#[a-zA-Z0-9] ]]; then
		if [[ "$("${nb_cmd[@]}" ls --no-color "$notebook":"$folder"/"$todo_id" --tags 2>/dev/null)" =~ ^No ]]; then
			sed -i -e '/^##\ Tags/d' -e 's/[\ ]*$//' "$todo_path"
			echo -e "\n## Tags\n\n#${init_tag}" >>"$todo_path"
			cat -s "$todo_path" | tee "$todo_path"
		fi
		local todo_tags
		local -a selection
		IFS=' ' read -r -a selection <<<"$1"
		for tag in "${selection[@]}"; do
			todo_tags=$(sed -n '/^#[a-zA-Z0-9]/p' "$todo_path" | tr '\n' ' ')
			if [[ "$todo_tags" =~ [\ ]*"$tag"[\ ]* ]] && [[ ! "#$init_tag" == "$tag" ]]; then
				sed -i -r -e "/^##\ Tags/{n;n;s/${tag}[\ ]*//}" -e 's/[\ ]*$//' "$todo_path"
			elif [[ ! "$todo_tags" =~ [\ ]*"$tag"[\ ]* ]] && [[ ! "#$init_tag" == "$tag" ]]; then
				sed -i "/^##\ Tags/{n;n;s/$/ ${tag}/}" "$todo_path"
			else
				return 1
			fi
		done
	else
		return 1
	fi
}

open_related() {
	if [[ "$1" =~ ^-\ \[\["$folder" ]]; then
		todo_id=$(echo "$1" | sed -r "s/.*$folder\/([0-9]+)\]\]/\1/")
		todo_path=$("${nb_cmd[@]}" todo --no-color --no-id --no-indicator --path "$notebook":"$folder"/"$todo_id" 2>/dev/null)
	elif [[ "$1" =~ ^-\ \< ]]; then
		local url
		url=$(echo "$1" | /usr/bin/grep -Eo "(((http|https|ftp|gopher)|mailto)[.:][^ >\"\]*|www\.[-a-z0-9.]+)[^ .,;\>\">\):]" 2>/dev/null)
		[[ -n "$url" ]] && open "$url"
	else
		return 1
	fi
}

while
	input=$(list | "${bemenu_cmd[@]}" --index "$index" --prompt "$title")
	[[ -n "$input" ]]
do
	back "$input" && continue
	if [[ "$view" == "todos" ]]; then
		view_todo     "$input" && continue
		view_filters  "$input" && continue
		reset_filters "$input" && continue
		add_todo      "$input" && continue
	elif [[ "$view" =~ ^state$|^tags$ ]]; then
		filters       "$input" && continue
	elif [[ "$view" == "infos" ]]; then
		delete_todo   "$input" && continue
		chstate_todo  "$input" && continue
		mod_tasks     "$input" && continue
		mod_tags      "$input" && continue
		open_related  "$input" && continue
	fi
done