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GNU GENERAL PUBLIC LICENSE
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===============================================================================
FAREND(.SH)
===============================================================================
Farend is a very simple todo-list program in shell.
It doesn't manage your todo-list; it can't delete, add, or edit events.
All it does is *display* them in a friendly way, ordered by earliest to latest.
By default, it will print a report listing “TODAY”'s events, followed by the
events of the following seven days. Anything not happening today— or in 7 days—
is ignored.
The idea is that it'll just take your todo-list text file, which you may fill
up with as many events as you want, and only print the immediately relevant
ones.
————————————————————————————————————————
TODO FILE
————————————————————————————————————————
TODO files are formatted like this:
YYYY-MM-DD HH:MM Event description goes here.
You can use wildcard in any of the date slots; if you don't know the specific
date, to signfify it happens all day (*:*), to signify it's yearly (*-MM-DD),
etc etc.
————————————————————————————————————————
USAGE
————————————————————————————————————————
-l $LIMIT | The amount of days you'd like to print events in advance (7)
-d $DIVIDER | Set the divider string under headers (default is 40 "-" chars)
-T $TODAY_MSG | Set the header title for today's events ("TODAY")
-P $PAST_MSG | Set the header title for events already past ("LONG GONE")
-L $LATER_MSG | Set the header title to non-today upcoming events ("NEXT")
-q | Print upcoming events without dividers or headers ($*_MSG)
-h | Print the help message
$ farend -l 100 -q /tmp/todo
# Will print upcoming events for the next 100 days, without headers or anything
# … usage goes on along those lines.
————————————————————————————————————————
BORING STUFF
————————————————————————————————————————
License is GPLv3-- check COPYING.txt.
Author is Jaidyn Ann <jadedctrl@teknik.io>
Sauce is at https://git.xwx.moe/farend.git

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#!/bin/sh
# --------------------------------------
# name: farend
# desc: a simple todo system in shell
# main: jaidyn ann <jadedctrl@teknik.io>
# --------------------------------------
# Take in everything in stdin, then print
# (Useful for piping something into a variable)
#
# local distance=0
function reade {
local stack=""
while read input; do
stack="$(printf '%s\n%s' "$stack" "$input")"
done
echo "$stack"
}
# --------------------------------------
# BASIC MATH
# Add together two numbers
function add {
local a="$1"; local b="$2"
echo "$a + $b" \
| bc
}
# Subtract two numbers
function subtract {
local a="$1"; local b="$2"
echo "$a - $b" \
| bc
}
# Multiply two numbers
function multiply {
local a="$1"; local b="$2"
echo "$a * $b" \
| bc
}
# Increment a number by one
function inc {
local a="$1"
add 1 "$a"
}
# Decrement a number by one
function dec {
local a="$1"
subtract "$a" 1
}
# Return whether or not a number is negative
function is_negative {
local a="$!"
echo "$a" \
| grep "^-" \
> /dev/null
}
# Format a number to be a certain amount of digits long
# (done by prepending zeroes)
function digits {
local number="$(reade)"
local digits="$1"
if test "$(dec "$(echo "$number" | wc -c )")" -lt "$(inc "$digits")"
then
local i=1;
while test $i -lt "$digits"; do
printf "0";
i="$(inc "$i")"
done
printf %s $number
else echo "$number";
fi
}
# --------------------------------------
# DATE PRIMITIVES
# Return today's date, YYYY-MM-DD
function today {
date +"%Y-%m-%d"
}
# Return current time, HH:MM
function now {
date +"%H:%M"
}
# Return the day of a given date
function date_day {
local date="$1"
echo "$date" \
| awk -F "-" '{print $3}'
}
# Return the month of a given date
function date_month {
local date="$1"
echo "$date" \
| awk -F "-" '{print $2}'
}
# Return the year of a given date
function date_year {
local date="$1"
echo "$date" \
| awk -F "-" '{print $1}'
}
# Return the hour of a given time
function time_hour {
local time="$1"
echo "$time" \
| awk -F ":" '{print $1}'
}
# Return the minute of a given time
function time_minute {
local time="$1"
echo "$time" \
| awk -F ":" '{print $2}'
}
# Return current year
function this_year {
date_year "$(today)"
}
# Return current month
function this_month {
date_month "$(today)"
}
# Return current day
function this_day {
date_day "$(today)"
}
# Return current hour
function this_hour {
time_hour "$(now)"
}
# Return current minute
function this_minute {
time_minute "$(now)"
}
# Return how many days ought to be in the given month
function month_days {
local month="$1"
case "$month" in
09) echo 30;;
04) echo 30;;
06) echo 30;;
11) echo 30;;
*) echo 31;;
esac
}
# --------------------------------------
# DATE ARITHMETIC
# Add an amount of days to a given date
function add_days {
local date="$1"
local days_added="$2"
local date_day="$(date_day "$date")"
carry_date "$date" "$(add "$date_day" "$days_added")"
}
# Return the amount of days between two dates
function date_distance {
local date_a="$1"; local date_b="$2"
local year_a="$(date_year "$date_a")"; local year_b="$(date_year "$date_b")"
local month_a="$(date_month "$date_a")"
local month_b="$(date_month "$date_b")"
local day_a="$(date_day "$date_a")"; local day_b="$(date_day "$date_b")"
if test "$month_a" -eq "$month_b" -a "$year_a" -eq "$year_a"; then
same_year_month_distance "$month_a" "$day_a" "$day_b"
elif test "$year_a" -eq "$year_b"; then
same_year_distance "$month_a" "$day_a" "$month_b" "$day_b"
else different_year_distance "$year_a" "$month_a" "$day_a" \
"$year_b" "$month_b" "$day_b"
fi
}
# Return whether or not a given date is valid
# (I.E., not too month months or days)
function is_balanced_date {
local date="$1"
local month="$(date_month "$date")"
local day="$(date_day "$date")"
local month_max="$(month_days "$month")"
if test "$month" -gt 12; then
echo "1"
elif test "$day" -gt "$month_max" ; then
echo "1";
else echo "0"
fi
}
# Correct an unbalanced date
function carry_date {
local date="$1"
while test "$(is_balanced_date "$date")" -eq 1; do
date="$(carry_months "$(carry_days "$date")")"
done
echo "$date"
}
# If too many days in a given month, carry them over
function carry_days {
local date="$1"
local year="$(date_year "$date")"
local month="$(date_month "$date")"
local days="$(date_day "$date")"
if test "$days" -gt "$(month_days "$month")"; then
local new_days="$(subtract "$days" "$(month_days "$month")" | digits 2)"
local new_month="$(add "$month" "1")"
echo "${year}-${new_month}-${new_days}"
else
echo "$date"
fi
}
# If too many months in a year, carry them over
function carry_months {
local date="$1"
local year="$(date_year "$date")"
local day="$(date_day "$date")"
local month="$(date_month "$date")"
if test "$month" -gt 12; then
month="$(subtract "$month" 12 | digits 2)"
year="$(inc "$year")"
fi
echo "${year}-${month}-${day}"
}
# Return the distance between two dates of different years
# (Helper function to date_distance)
function different_year_distance {
local year_a="$1"; local month_a="$2"; local day_a="$3"
local year_b="$4"; local month_b="$5"; local day_b="$6"
add "$(multiply 365 $(subtract $year_b $year_a))" \
"$(same_year_distance "$month_a" "$day_a" "$month_b" "$day_b")"
}
# Return the distance between two dates of the same year and month
# (Helper function to date_distance)
function same_year_month_distance {
local month="$1"
local day_a="$2"; local day_b="$3"
subtract "$day_b" "$day_a"
}
# Return the distance between two dates of the same year
# (Helper function to date_distance)
function same_year_distance {
local month_a="$1"; local day_a="$2"
local month_b="$3"; local day_b="$4"
local month_days_a="$(month_days "$month_a")"
local distance=0
if test "$month_a" -gt "$month_b"; then
echo "-$(same_year_distance "$month_b" "$day_b" "$month_a" "$day_a")"
else
distance="$(subtract "$month_days_a" "$day_a")"
month_a="$(inc "$month_a")"
while test "$month_a" -lt "$month_b"; do
month_a="$(inc "$month_a")"
distance="$(add "$distance" "$(month_days "$month_a")")"
done
add "$distance" "$day_b"
fi
}
# --------------------------------------
# TODO HANDLING
# Replace piped todo's vague dates with current dates
function demystify_todo_times {
sed 's%^\*-%'"$(this_year)"'-%g' \
| sed 's%-\*-%-'"$(this_month)"'-%g' \
| sed 's%-\*%-'"$(this_day)"'%g' \
| sed 's%\*:%'"$(this_hour)"':%g' \
| sed 's%:\*%:'"$(this_minute)"'%g'
}
# Filter out comments and blank lines from piped todo
function ignore_todo_blanks {
grep -v "^#" \
| grep -v "^$"
}
function preprocess_todo {
ignore_todo_blanks \
| demystify_todo_times
}
function todo_line_date {
awk '{print $1}'
}
function todo_line_time {
awk '{print $2}'
}
function todo_line_desc {
awk '{print $2}'
}
function todo_line_distance {
local line_date="$(todo_line_date)"
date_distance "$(today)" "$line_date"
}
function todo_line_is_trash {
if is_negative "$(todo_line_distance)"; then
return 0
else
return 1
fi
}
function upcoming_todo_lines {
local limit="$1"
preprocess_todo \
| while IFS= read -r line; do
if test "$limit" -gt "$(echo "$line" | todo_line_distance)"; then
echo "$line"
fi
done
}
function today_todo_lines {
grep "$(today)"
}
function generate_report {
local todo_file="$1"
local limit="$2"
local today_lines="$(cat "$todo_file" | preprocess_todo | today_todo_lines)"
echo "$TODAY_MSG"
echo "$DIVIDER"
echo "$today_lines"
echo
echo "$LATER_MSG"
echo "$DIVIDER"
grep -v "$(today)" $todo_file \
| upcoming_todo_lines $limit \
| sort -n
}
# --------------------------------------
# INVOCATION
TODO_FILE="$HOME/.todo"
LIMIT=7
DIVIDER="----------------------------------------"
TODAY_MSG="TODAY"
LATER_MSG="NEXT EPISODE..."
PAST_MSG="FROM THE GRAVE"
QUIET_MODE=1
while getopts 'l:D:T:L:P:qh' c; do
case "$c" in
l) LIMIT="$OPTARG" ;;
D) DIVIDER="$OPTARG" ;;
T) TODAY_MSG="$OPTARG" ;;
L) LATER_MSG="$OPTARG" ;;
P) PAST_MSG="$OPTARG" ;;
q) QUIET_MODE=0 ;;
h) echo "$HELP"; exit 2 ;;
esac
done
if test $QUIET_MODE -eq 1; then
generate_report "$TODO_FILE" "$LIMIT"
else
cat "$TODO_FILE" \
| preprocess_todo \
| upcoming_todo_lines "$LIMIT" \
| sort -n
fi