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+;;; org-awk.el --- AWK based flashcard indexing -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2020  Leon Rische
+
+;; Author: Leon Rische <emacs@leonrische.me>
+
+;; 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:
+;;
+;;
+;;
+;;; Code:
+
+(defun org-fc-awk--find (paths)
+  "Generate shell code to search PATHS for org files.
+Matches all .org files ignoring ones with names don't start with
+a '.' to exclude temporary / backup files.
+With the '-L' option, 'find' follows symlinks."
+  (format
+   "find -L %s -name \"*.org\" -not -name \".*\" -print0"
+   (mapconcat 'identity paths " ")))
+
+(defun org-fc-awk--indexer-variables ()
+  "Variables to pass to indexer scripts."
+  `(("fc_tag" . ,org-fc-flashcard-tag)
+    ("suspended_tag" . ,org-fc-suspended-tag)
+    ("type_property" . ,org-fc-type-property)
+    ("cloze_type_property" . ,org-fc-cloze-type-property)
+    ("created_property" . ,org-fc-created-property)
+    ("review_data_drawer" . ,org-fc-review-data-drawer)))
+
+(cl-defun org-fc-awk--command (file &optional &key variables utils input)
+  "Generate the shell command for calling awk.
+The script is called on FILE with (key . value) pairs VARIABLES.
+If UTILS is set to a non-nil value, the shared util file is
+included, too.  If INPUT is set to a string, use that
+file (absolute path) as input."
+  (concat "gawk "
+          (mapconcat
+           (lambda (kv) (format "-v %s=%s" (car kv) (cdr kv)))
+           variables
+           " ")
+          " "
+          (if utils
+              (concat "-f "
+                      (expand-file-name "awk/utils.awk" org-fc-source-path) " "))
+          (concat "-f " (expand-file-name file org-fc-source-path))
+          " " input))
+
+(defun org-fc-awk--pipe (&rest commands)
+  "Combine COMMANDS with shell pipes."
+  (mapconcat 'identity commands " | "))
+
+(defun org-fc-awk--xargs (command)
+  "Generate the shell command for calling COMMAND with xargs."
+  (concat "xargs -0 " command))
+
+;; Given two tag strings,
+;; one inherited and one for the current card,
+;; combine them respecting `org-use-tag-inheritance'
+;; and `org-tags-exclude-from-inheritance'.
+;; Inheritance code is based on `org-get-tags'
+(defun org-fc-awk-combine-tags (itags ltags)
+  "Simulate org tag inheritance on ITAGS and LTAGS.
+ITAGS and LTAGS are strings `\":tag1:tag2:\"'"
+  (delete-dups
+   (append
+    (org-remove-uninherited-tags (split-string itags ":" t))
+    (split-string ltags ":" t))))
+
+(defun org-fc-awk-flatten-index (index)
+  "Remove the file-level of INDEX."
+  (mapcan
+   (lambda (file)
+     (mapcar
+      (lambda (card)
+        (plist-put card :path (plist-get file :path)))
+      (plist-get file :cards)))
+   index))
+
+(defun org-fc-awk-index-paths (paths)
+  "Generate a list of all cards and positions in PATHS."
+  (let ((output (shell-command-to-string
+                 (org-fc-awk--pipe
+                  (org-fc-awk--find paths)
+                  (org-fc-awk--xargs
+                   (org-fc-awk--command
+                    "awk/index.awk"
+                    :utils t
+                    :variables (org-fc-awk--indexer-variables)))))))
+    (if (string-prefix-p "(" output)
+        (org-fc-awk-flatten-index
+         (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 output)))
+      (error "Org-fc shell error: %s" output))))
+
+(defun org-fc-awk-stats-reviews ()
+  "Statistics for all card reviews.
+Return nil there is no history file."
+  (if (file-exists-p org-fc-review-history-file)
+      (let ((output
+             (shell-command-to-string
+              (org-fc-awk--command
+               "awk/stats_reviews.awk"
+               :utils t
+               :input org-fc-review-history-file
+               :variables `(("min_box" . ,org-fc-stats-review-min-box))))))
+        (if (string-prefix-p "(" output)
+            (read output)
+          (error "Org-fc shell error: %s" output)))))
+
+;;; Footer
+
+(provide 'org-fc-awk)
+
+;;; org-fc-hydra.el ends here