blob: 83fee3792531f9cb8ea6040a40c445cab220d185 (
about) (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
;;; org-fc-cache.el --- Cache for org-fc -*- lexical-binding: t; -*-
;; Copyright (C) 2020-2021 Leon Rische
;; Author: Leon Rische <emacs@leonrische.me>
;; Url: https://www.leonrische.me/pages/org_flashcards.html
;; Package-requires: ((emacs "26.3") (org "9.3"))
;; Version: 0.1.0
;; This program 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 3 of the License, or
;; (at your option) any later version.
;; This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Even with the AWK based indexer, indexing cards before each review
;; gets slow if there are a lot of files / cards.
;;
;; After running the indexer one time, file checksums are used to
;; determine which cache entries need to be updated, assuming only a
;; small subset of the flashcard files is changed between reviews,
;; this is much faster than building the full index each time.
;;; Code:
(require 'org-fc-core)
;;; Queue / Processing of Files
(defvar org-fc-cache
(make-hash-table :test #'equal)
"Cache mapping filenames to card lists.")
(defun org-fc-cache-update ()
"Make sure the cache is up to date."
(let* ((hashes (org-fc-cache-hashes org-fc-directories))
(changed
(cl-remove-if
(lambda (file)
(string=
(plist-get (gethash file org-fc-cache) :hash)
(gethash file hashes)))
(hash-table-keys hashes))))
;; Update changed files
(dolist (new (org-fc-awk-index-files changed))
(let* ((path (plist-get new :path))
(hash (gethash path hashes)))
(puthash
path
(plist-put new :hash hash)
org-fc-cache)))
;; Remove deleted files
(dolist (file (hash-table-values org-fc-cache))
(unless (gethash file hashes)
(remhash file org-fc-cache)))))
;;; Filtering Entries
(defun org-fc-cache-index (paths &optional filter)
"Find cards in PATHS matching an optional FILTER.
FILTER is assumed to be a predicate function taking a single card
as its input."
(org-fc-cache-update)
;; Make sure paths are absolute & canonical
;; Keys of the hash table can be assumed to be absolute & canonical.
(setq paths (mapcar #'expand-file-name paths))
(let (res)
(maphash
(lambda (path file)
(when (cl-some (lambda (p) (string-prefix-p p path)) paths)
;; Use push instead of `nconc' because `nconc' would break
;; the entries of the hash table.
(if filter
(dolist (card (cl-remove-if-not filter (plist-get file :cards)))
(push (plist-put
(plist-put card :path path)
:filetitle
(plist-get file :title)) res))
(dolist (card (plist-get file :cards))
(push
(plist-put
(plist-put card :path path)
:filetitle
(plist-get file :title)) res)))))
org-fc-cache)
res))
;; TODO: Check for awk errors
;; TODO: This should go into the awk file
(defun org-fc-awk-index-files (files)
"Generate a list of all cards and positions in FILES.
Unlike `org-fc-awk-index-paths', files are included directly in
the AWK command and directories are not supported."
(mapcar
(lambda (file)
(plist-put file :cards
(mapcar
(lambda (card)
(plist-put
card :tags
(org-fc-awk-combine-tags
(plist-get card :inherited-tags)
(plist-get card :local-tags))))
(plist-get file :cards))))
(read
(shell-command-to-string
(org-fc-awk--command
"awk/index.awk"
:variables (org-fc-awk--indexer-variables)
:input (mapconcat #'identity files " "))))))
;;; Cache Mode
(defun org-fc-cache--enable ()
"Enable org-fc-cache.
Initializes the cache and adds hooks."
(message "building org-fc cache...")
(org-fc-cache-update)
(add-hook 'org-fc-before-setup-hook #'org-fc-cache-coherence-check)
(setq org-fc-index-function #'org-fc-cache-index)
(message "org-fc cache enabled"))
(defun org-fc-cache--disable ()
"Disable org-fc-cache.
Resets the cache and removes hooks."
(setq org-fc-cache (make-hash-table :test #'equal))
(remove-hook 'org-fc-before-setup-hook #'org-fc-cache-coherence-check)
(setq org-fc-index-function #'org-fc-awk-index)
(message "org-fc cache disabled"))
(define-minor-mode org-fc-cache-mode
"Minor mode for caching org-fc card data.
This mode sets up several hooks to ensure the case updated when files change,
are renamed or deleted."
:lighter "org-fc cache"
:group 'org-fc
:require 'org-fc
:global t
(if org-fc-cache-mode
(org-fc-cache--enable)
(org-fc-cache--disable)))
;;; Coherence Check
;; TODO: There already is a similar check in org-fc,
;; those should be combined.
;;;###autoload
(defun org-fc-cache-coherence-check ()
"Check if the entry at point is coherent with its cache representation.
This is especially relevant w.r.t a card's due date / suspension state before review."
(org-fc-review-with-current-item cur
(if (org-fc-suspended-entry-p)
(error "Trying to review a suspended card"))
(let* ((position (plist-get cur :position))
(review-data (org-fc-get-review-data))
(row (assoc position review-data #'string=))
(due (parse-iso8601-time-string (nth 4 row))))
(unless (time-less-p due (current-time))
(error "Trying to review a non-due card")))))
;;; Hashing
(defun org-fc-cache-hashes (directories)
"Compute hashsums of all org files in DIRECTORIES."
(let ((output (shell-command-to-string
(org-fc-awk--pipe
(org-fc-awk--find directories)
(org-fc-awk--xargs "sha1sum"))))
(table (make-hash-table :test #'equal)))
(dolist (line (split-string output "\n" t))
(let ((parts (split-string line " ")))
(puthash (cadr parts) (car parts) table)))
table))
;;; Footer
(provide 'org-fc-cache)
;;; org-fc-cache.el ends here
|
