Mini Bash Todo

todo.bash

#!/bin/bash

# File that contains the tasks
DATA=$HOME/.config/todo.lst
touch $DATA

esc=$(printf '\033')
tab=$'\t'

# Highlight search term.
light()
{
	[[ -z $1 ]] && cat || sed "s/\($1\)/${esc}[7m\\1${esc}[27m/g"
}

# Will colorize the @tag according to it's hash. Mark as bold @tag that contains numbers or uppercase letters.
color()
{
	awk -F $'\t' '{chk="cksum|awk \"{print $2}\""; print $2|& chk; close(chk,"to"); while(chk |& getline color > 0) bold=match($2,/^@[A-Z|0-9][A-Z|0-9]*$/); printf("\033[%sm%s\t\033[%dm%s\033[39m\t%s\t%s\033[0m\n",bold,$1,color%6+31,$2,$3,$4); close(chk)}'\
	| perl -pe "s/([^\w])\*([\s\w]+)\*([^\w])/\$1${esc}[4m\$2${esc}[24m\$3/"
}

# Format the output in columns.
col()
{
	column -s$'\t' -t
}

while getopts "ha" o; do
	case $o in
	h)
		cat << EOF
TODO - Simple task manager
This script is a simple task manager that allows you to add, list, and mark tasks as done.
It uses a text file to store the tasks and allows you to open it in your favorite text editor.
Sauce: https://gist.github.com/moechofe/f55a0e1e62ad765c197a84f3ae8567aa

Usage:
  todo               List undone tasks
  todo TERM          List undone tasks and highlight TERM
  todo NUM           Show task number NUM
  todo ed            Open tasks list in text editor
  todo @TAG TASK     Add the TASK with TAG
  todo NUM ok|done   Mark the task number NUM has done
  todo ok|done NUM   Mark the task number NUM has done
  todo -h            Show this help message
  todo -a            Show all tasks with description

Arguments:
  TERM   Search term (no spaces)
  NUM    Task number (digits only)
  TAG    Task tag (no spaces)
  TASK   Task title, can contain description after 1 dot+space (. )

EOF
		exit 1;;
	a)
		# last all
		cat "$DATA"\
		| awk -F$'\t' '{gsub(/\. +/,".\n\t\t\t",$4); printf("%s\t%s\t%s\t%s\n",$2,$3,$1,$4)}'\
		| color "${1:-}"\
		| light "$2"\
		| col
		exit 0;;
	esac
done


# editor
if [[ $# -eq 1 ]] && [[ $1 == "ed" ]]; then
	eval "${EDITOR:-vim} $DATA"

# mark as done
elif [[ $# -eq 2 ]] && [[ $2 =~ ([oO][kK]|[dD][oO][nN][eE]) ]] && [[ $1 =~ ^[0-9][0-9]*$ ]]; then
	sed -i "s#^\(-\+\t\)\($1\t.*\)#$(date -u +"%Y-%m-%dT%H:%M:%SZ")\t\\2#" "$DATA"

# mark as done
elif [[ $# -eq 2 ]] && [[ $1 =~ ([oO][kK]|[dD][oO][nN][eE]) ]] && [[ $2 =~ ^[0-9][0-9]*$ ]]; then
	sed -i "s#^\(-\+\t\)\($2\t.*\)#$(date -u +"%Y-%m-%dT%H:%M:%SZ")\t\\2#" "$DATA"

# add a task
elif [[ $# -gt 1 ]] && [[ $1 =~ ^(@..*)$ ]]; then
	id=0
	[[ -f "$DATA" ]] && id=$(cat "$DATA" | awk -F"$tab" '{print $2}' | sed 's/^#//' | sort -nr | head -1)
	((id++))
	echo "${@:2}"\
	| awk -F"$tab" -v i="$id" -v p="${BASH_REMATCH[1]}" '{f=$1;$1="";printf("--------------------\t%s\t%s\t%s\n",i,p,f,$0)}'\
	>>"$DATA"

# show one task
elif [[ $# -eq 1 ]] && [[ $1 =~ ^[0-9][0-9]*$ ]]; then
	cat "$DATA"\
	| grep "^[0-9A-Z:-][0-9A-Z:-]*$tab$1$tab"\
	| awk -F$'\t' '{gsub(/\. +/,".\n\t\t",$4); printf("%s\t%s\t%s\n",$2,$3,$4)}'\
	| color "${1:-}"\
	| col

# list all tasks
else
	cat "$DATA"\
	| grep '^-'\
	| awk -F"$tab" '{sub(/\. .*/,"...",$4); printf("%s\t%s\t%s\n",$2,$3,$4)}'\
	| color "${1:-}"\
	| light "$1"\
	| col

fi