ladd

#!/bin/sh
USAGE="
$(basename $0) [-a add_file] query_files...

Copies a previous transaction to today.

Select a previous transaction by fuzzy matching on the titles. This
transaction is then copied to the end of the journal, uncleared and set
to the current date. Finally, it opens the end of the file in $EDITOR.

Bonus over 'hledger add': interactive matching it easier, and
transaction formatting is retained because it's just a copy.

    add_file     The transaction is appended to this file.
                 Default (if set): \$LEDGER_ADD_FILE
                 Default (otherwise): \$LEDGER_FILE

    query_files  A list of files to query for previous transactions.
                 Default: \$LEDGER_FILE

Depends on:
- fzf (https://github.com/junegunn/fzf)
- sponge (https://joeyh.name/code/moreutils/)

If you split files by year, it may be useful to alias (in 2020):

    alias ladd='ladd -a .../2020/main.journal .../*/main.journal'
"

add_file="${LEDGER_ADD_FILE:-$LEDGER_FILE}"
while getopts a: f; do
	case "$f" in
	a) add_file="$OPTARG";;
	\?) echo "$USAGE"; exit 1;;
	esac
done
shift $((OPTIND - 1))

# fuzzy select a transaction title
selection="$(sed -n 's/....-..-..\( [*!]\)\? //p' "${@:-$LEDGER_FILE}" | sort | uniq | fzf)"
[ -z "$selection" ] && exit 0 # quit if escaped

sed -n "/....-..-..\( [*!]\)\? ${selection}\$/,/^\$/p" "${@:-$LEDGER_FILE}" | # print matching transactions
	sed '${/^$/d}' | # remove trailing empty line
	sed -n '/^$/{s/.*//;x;d};H;${x;p}' | # remove all before the last empty line
	sed "s/^....-..-..\( [*!]\)\?/$(date +'%Y-%m-%d')/" | # replace date with today, remove marker
	sponge -a "$add_file" # append to the file, use sponge in case it's also an input file

# review change: open end of the file (if I know how)
case "$EDITOR" in
vi*|nvi*) "$EDITOR" +\$ "$add_file" ;;
emacs)    "$EDITOR" "$add_file" -f end-of-buffer ;;
*)        "$EDITOR" "$add_file" ;;
esac