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;;; ledger-xact.el --- Helper code for use with the "ledger" command-line tool -*- lexical-binding: t; -*-
;; Copyright (C) 2003-2016 John Wiegley (johnw AT gnu DOT org)
;; This file is not part of GNU Emacs.
;; This is free software; you can redistribute it and/or modify it under
;; the terms of the GNU General Public License as published by the Free
;; Software Foundation; either version 2, or (at your option) any later
;; version.
;;
;; This is distributed in the hope that it will be useful, but WITHOUT
;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
;; for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
;; MA 02110-1301 USA.
;;; Commentary:
;; Utilities for running ledger synchronously.
;;; Code:
(require 'eshell)
(require 'ledger-regex)
(require 'ledger-navigate)
(require 'ledger-exec)
(require 'ledger-post)
(declare-function ledger-read-date "ledger-mode" (prompt))
(declare-function ledger-format-date "ledger-init" (&optional date))
;; TODO: This file depends on code in ledger-mode.el, which depends on this.
(defcustom ledger-highlight-xact-under-point t
"If t highlight xact under point."
:type 'boolean
:group 'ledger)
(defvar-local ledger-xact-highlight-overlay (list))
(defun ledger-highlight-make-overlay ()
(let ((ovl (make-overlay 1 1)))
(overlay-put ovl 'font-lock-face 'ledger-font-xact-highlight-face)
(overlay-put ovl 'priority '(nil . 99))
ovl))
(defun ledger-highlight-xact-under-point ()
"Move the highlight overlay to the current transaction."
(when ledger-highlight-xact-under-point
(unless ledger-xact-highlight-overlay
(setq ledger-xact-highlight-overlay (ledger-highlight-make-overlay)))
(let ((exts (ledger-navigate-find-element-extents (point))))
(let ((b (car exts))
(e (cadr exts))
(p (point)))
(if (and (> (- e b) 1) ; not an empty line
(<= p e) (>= p b) ; point is within the boundaries
(not (region-active-p))) ; no active region
(move-overlay ledger-xact-highlight-overlay b (+ 1 e))
(move-overlay ledger-xact-highlight-overlay 1 1))))))
(defun ledger-xact-context ()
"Return the context of the transaction containing point or nil."
(let ((i 0))
(while (eq (ledger-context-line-type (ledger-context-other-line i)) 'acct-transaction)
(setq i (- i 1)))
(let ((context-info (ledger-context-other-line i)))
(if (eq (ledger-context-line-type context-info) 'xact)
context-info
nil))))
(defun ledger-xact-payee ()
"Return the payee of the transaction containing point or nil."
(let ((xact-context (ledger-xact-context)))
(if xact-context
(ledger-context-field-value xact-context 'payee)
nil)))
(defun ledger-xact-date ()
"Return the date of the transaction containing point or nil."
(let ((xact-context (ledger-xact-context)))
(if xact-context
(ledger-context-field-value xact-context 'date)
nil)))
(defun ledger-time-less-p (t1 t2)
"Say whether time value T1 is less than time value T2."
;; TODO: assert listp, or support when both are strings
(or (< (car t1) (car t2))
(and (= (car t1) (car t2))
(< (nth 1 t1) (nth 1 t2)))))
(defun ledger-xact-find-slot (moment)
"Find the right place in the buffer for a transaction at MOMENT.
MOMENT is an encoded date"
(let (last-xact-start)
(catch 'found
(ledger-xact-iterate-transactions
(function
(lambda (start date _mark _desc)
(setq last-xact-start start)
(if (ledger-time-less-p moment date)
(throw 'found t))))))
(when (and (eobp) last-xact-start)
(let ((end (cadr (ledger-navigate-find-xact-extents last-xact-start))))
(goto-char end)
(insert "\n")
(forward-line)))))
(defun ledger-xact-iterate-transactions (callback)
"Iterate through each transaction call CALLBACK for each."
(goto-char (point-min))
(let* ((now (current-time))
(current-year (nth 5 (decode-time now))))
(while (not (eobp))
(when (looking-at ledger-iterate-regex)
(let ((found-y-p (match-string 2)))
(if found-y-p
(setq current-year (string-to-number found-y-p)) ;; a Y directive was found
(let ((start (match-beginning 0))
(year (match-string 4))
(month (string-to-number (match-string 5)))
(day (string-to-number (match-string 6)))
(mark (match-string 7))
(desc (match-string 9)))
(if (and year (> (length year) 0))
(setq year (string-to-number year)))
(funcall callback start
(encode-time 0 0 0 day month
(or year current-year))
mark desc)))))
(forward-line))))
(defvar ledger-copy-transaction-insert-blank-line-after nil
"Non-nil means insert blank line after a transaction inserted with ‘ledger-copy-transaction-at-point’.")
(defun ledger-copy-transaction-at-point (date)
"Ask for a new DATE and copy the transaction under point to that date. Leave point on the first amount."
(interactive (list
(ledger-read-date "Copy to date: ")))
(let* ((extents (ledger-navigate-find-xact-extents (point)))
(transaction (buffer-substring-no-properties (car extents) (cadr extents)))
(encoded-date (ledger-parse-iso-date date)))
(ledger-xact-find-slot encoded-date)
(insert transaction
(if ledger-copy-transaction-insert-blank-line-after
"\n\n"
"\n"))
(beginning-of-line -1)
(ledger-navigate-beginning-of-xact)
(re-search-forward ledger-iso-date-regexp)
(replace-match date)
(ledger-next-amount)
(if (re-search-forward "[-0-9]")
(goto-char (match-beginning 0)))))
(defun ledger-delete-current-transaction (pos)
"Delete the transaction surrounging POS."
(interactive "d")
(let ((bounds (ledger-navigate-find-xact-extents pos)))
(delete-region (car bounds) (cadr bounds)))
(delete-blank-lines))
(defvar ledger-add-transaction-last-date nil
"Last date entered using `ledger-read-transaction'.")
(defun ledger-read-transaction ()
"Read the text of a transaction, which is at least the current date."
(let* ((reference-date (or ledger-add-transaction-last-date (current-time)))
(full-date-string (ledger-format-date reference-date))
;; Pre-fill year and month, but not day: this assumes DD is the last format arg.
(initial-string (replace-regexp-in-string "[0-9]+$" "" full-date-string))
(entered-string (read-string "Transaction: "
initial-string 'ledger-minibuffer-history)))
(if (string= initial-string entered-string)
full-date-string
entered-string)))
(defun ledger-parse-iso-date (date)
"Try to parse DATE using `ledger-iso-date-regexp' and return a time value or nil."
(save-match-data
(when (string-match ledger-iso-date-regexp date)
(encode-time 0 0 0 (string-to-number (match-string 4 date))
(string-to-number (match-string 3 date))
(string-to-number (match-string 2 date))))))
(defun ledger-add-transaction (transaction-text &optional insert-at-point)
"Use ledger xact TRANSACTION-TEXT to add a transaction to the buffer.
If INSERT-AT-POINT is non-nil insert the transaction there,
otherwise call `ledger-xact-find-slot' to insert it at the
correct chronological place in the buffer."
(interactive (list (ledger-read-transaction)))
(let* ((args (with-temp-buffer
(insert transaction-text)
(eshell-parse-arguments (point-min) (point-max))))
(ledger-buf (current-buffer))
(separator "\n"))
(unless insert-at-point
(let* ((date (car args))
(parsed-date (ledger-parse-iso-date date)))
(setq ledger-add-transaction-last-date parsed-date)
(push-mark)
;; TODO: what about when it can't be parsed?
(ledger-xact-find-slot (or parsed-date date))
(when (looking-at "\n*\\'")
(setq separator ""))))
(if (> (length args) 1)
(save-excursion
(insert
(with-temp-buffer
(apply #'ledger-exec-ledger ledger-buf (current-buffer) "xact"
(mapcar 'eval args))
(goto-char (point-min))
(ledger-post-align-postings (point-min) (point-max))
(buffer-string))
separator))
(progn
(insert (car args) " ")
(save-excursion (insert "\n" separator))))))
(provide 'ledger-xact)
;;; ledger-xact.el ends here
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