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org-ql.el
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;;; org-ql.el --- Org Query Language, search command, and agenda-like view -*- lexical-binding: t; -*-
;; Author: Adam Porter <[email protected]>
;; Url: https://github.com/alphapapa/org-ql
;; Version: 0.6-pre
;; Package-Requires: ((emacs "26.1") (dash "2.13") (dash-functional "1.2.0") (f "0.17.2") (map "2.1") (org "9.0") (org-super-agenda "1.2") (ov "1.0.6") (peg "1.0") (s "1.12.0") (transient "0.1") (ts "0.2-pre"))
;; Keywords: hypermedia, outlines, Org, agenda
;;; Commentary:
;; `org-ql' is a lispy query language for Org files. It allows you to
;; find Org entries matching certain criteria and return a list of
;; them or perform actions on them. Commands are also provided which
;; display a buffer with matching results, similar to an Org Agenda
;; buffer.
;;; License:
;; 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/>.
;;; Code:
;;;; Requirements
(require 'cl-lib)
(require 'org)
(require 'org-element)
(require 'org-habit)
(require 'seq)
(require 'subr-x)
(require 'dash)
(require 'dash-functional)
(require 'map)
(require 'ts)
;;;; Constants
;; Note the use of the `rx' `blank' keyword, which matches "horizontal" whitespace.
(defconst org-ql-tsr-regexp-inactive
(concat org-ts-regexp-inactive "\\(--?-?"
org-ts-regexp-inactive "\\)?")
;; MAYBE: Propose this for org.el.
"Regular expression matching an inactive timestamp or timestamp range.")
(defconst org-ql-clock-regexp
(rx bol (0+ blank) "CLOCK:" (group (1+ not-newline)))
"Regular expression matching Org \"CLOCK:\" lines.
Like `org-clock-line-re', but matches the timestamp range in a
match group.")
(defconst org-ql-planning-regexp
(rx bol (0+ blank) (or "CLOSED" "DEADLINE" "SCHEDULED") ":" (1+ blank) (group (1+ not-newline)))
"Regular expression matching Org \"planning\" lines.
That is, \"CLOSED:\", \"DEADLINE:\", or \"SCHEDULED:\".")
(defconst org-ql-tag-line-re
"^\\*+ \\(?:.*[ \t]\\)?\\(:\\([[:alnum:]_@#%:]+\\):\\)[ \t]*$"
;; Copied from `org-tag-line-re' from org.el.
"Regexp matching tags in a headline.
Tags are stored in match group 1. Match group 2 stores the tags
without the enclosing colons.")
(defconst org-ql-link-regexp
(if (bound-and-true-p org-link-bracket-re)
org-link-bracket-re
org-bracket-link-regexp)
"Regexp used to match Org bracket links.
Necessary because of changes in Org 9.something.")
(defconst org-ql-link-description-group
(if (bound-and-true-p org-link-bracket-re)
2
3)
;; I wish Org would not introduce backward-incompatible changes like this in
;; minor releases. It requires awkward workarounds to be maintained for years.
"Regexp match group used to extract description from Org bracket links.
Necessary because of backward-incompatible changes in Org
9.something: when `org-link-bracket-re' was added,
`org-bracket-link-regexp' was marked as an obsolete alias for it,
but the match groups were changed, so they are not compatible.")
;;;; Variables
(defvar org-ql--today nil)
(defvar org-ql-use-preamble t
;; MAYBE: Naming things is hard. There must be a better term than "preamble."
"Use query preambles to speed up searches.
May be disabled for debugging, benchmarks, etc.")
(defvar org-ql-cache (make-hash-table :weakness 'key)
;; IIUC, setting weakness to `key' means that, when a buffer is closed,
;; its entries will be removed from this table at the next GC.
"Query cache, keyed by buffer.
Each value is a list of the buffer's modified tick and another
hash table, keyed by arguments passed to
`org-ql--select-cached'.")
(defvar org-ql-tags-cache (make-hash-table :weakness 'key)
"Per-buffer tags cache.
Keyed by buffer. Each value is a cons of the buffer's modified
tick, and another hash table keyed on buffer position, whose
values are a list of two lists, inherited tags and local tags, as
strings.")
(defvar org-ql-node-value-cache (make-hash-table :weakness 'key)
"Per-buffer node cache.
Keyed by buffer. Each value is a cons of the buffer's modified
tick, and another hash table keyed on buffer position, whose
values are alists in which the key is a function and the value is
the value returned by it at that node.")
(eval-and-compile
(defvar org-ql-predicates
;; FIXME: Is this remapping still necessary? It was mapping `org-back-to-heading'
;; to itself until now, so maybe I broke it and it doesn't matter anymore.
(list (cons 'org-back-to-heading (list :name 'org-back-to-heading :fn (symbol-function 'outline-back-to-heading))))
"Plist of predicates, their corresponding functions, and their docstrings.
This list should not contain any duplicates."))
;;;; Customization
(defgroup org-ql nil
"Customization for `org-ql'."
:group 'org
:link '(custom-manual "(org-ql)Usage")
:link '(url-link "https://github.com/alphapapa/org-ql"))
(defcustom org-ql-ask-unsafe-queries t
"Ask before running a query that could run arbitrary code.
Org QL queries in sexp form can contain arbitrary expressions.
When opening an \"org-ql-search:\" link or updating a dynamic
block that contains a query in sexp form, and this option is
non-nil, the user will be prompted for confirmation before
opening the link.
This variable may be set file-locally to disable this warning in
files that the user assumes are safe (e.g. of known provenance).
Users who are entirely unconcerned about this issue may disable
the option globally (at their own risk, however minimal it
probably is).
See Info node `(org-ql)Queries'."
:type 'boolean
:risky t)
;;;; Macros
;;;###autoload
(cl-defmacro org-ql (buffers-or-files query &key sort narrow action)
"Expands into a call to `org-ql-select' with the same arguments.
For convenience, arguments should be unquoted."
(declare (indent defun)
(obsolete "Please use functions `org-ql-select' or `org-ql-query' instead" "org-ql 0.5"))
`(org-ql-select ,buffers-or-files
',query
:action ',action
:narrow ,narrow
:sort ',sort))
;;;; Functions
;;;;; Query execution
(define-hash-table-test 'org-ql-hash-test #'equal (lambda (args)
(sxhash-equal (prin1-to-string args))))
;;;###autoload
(cl-defun org-ql-select (buffers-or-files query &key action narrow sort)
"Return items matching QUERY in BUFFERS-OR-FILES.
BUFFERS-OR-FILES is a file or buffer, a list of files and/or
buffers, or a function which returns such a list.
QUERY is an `org-ql' query sexp (quoted, since this is a
function).
ACTION is a function which is called on each matching entry with
point at the beginning of its heading. It may be:
- `element' or nil: Equivalent to `org-element-headline-parser'.
- `element-with-markers': Equivalent to calling
`org-element-headline-parser', with markers added using
`org-ql--add-markers'. Suitable for formatting with
`org-ql-view--format-element', allowing insertion into an Org
Agenda-like buffer.
- A sexp, which will be byte-compiled into a lambda function.
- A function symbol.
If NARROW is non-nil, buffers are not widened (the default is to
widen and search the entire buffer).
SORT is either nil, in which case items are not sorted; or one or
a list of defined `org-ql' sorting methods (`date', `deadline',
`scheduled', `todo', `priority', or `random'); or a user-defined
comparator function that accepts two items as arguments and
returns nil or non-nil."
(declare (indent defun))
(-let* ((buffers (->> (cl-typecase buffers-or-files
(null (list (current-buffer)))
(function (funcall buffers-or-files))
(list buffers-or-files)
(otherwise (list buffers-or-files)))
(--map (cl-etypecase it
;; NOTE: This etypecase is essential to opening links safely,
;; as it rejects, e.g. lambdas in the buffers-files argument.
(buffer it)
(string (or (find-buffer-visiting it)
(when (file-readable-p it)
;; It feels unintuitive that `find-file-noselect' returns
;; a buffer if the filename doesn't exist.
(find-file-noselect it))
(user-error "Can't open file: %s" it)))))
;; Ignore special/hidden buffers.
(--remove (string-prefix-p " " (buffer-name it)))))
(query (org-ql--normalize-query query))
((&plist :query :preamble :preamble-case-fold) (org-ql--query-preamble query))
(predicate (org-ql--query-predicate query))
(action (pcase action
;; NOTE: These two lambdas are backquoted to prevent "unused lexical
;; variable" warnings from byte-compilation, because they don't use
;; all of the variables from their enclosing scope.
('element-with-markers (byte-compile
`(lambda (&rest _ignore)
(org-ql--add-markers
(org-element-headline-parser (line-end-position))))))
((or 'nil 'element) (byte-compile
`(lambda (&rest _ignore)
(org-element-headline-parser (line-end-position)))))
((pred functionp) action)
((and (pred listp) (guard (or (special-form-p (car action))
(macrop (car action))
(functionp (car action)))))
(byte-compile
`(lambda (&rest _ignore)
,action)))
(_ (user-error "Invalid action form: %s" action))))
(org-ql--today (ts-now))
(items (let (orig-fns)
(unwind-protect
(progn
(--each org-ql-predicates
;; Set predicate functions.
(-let (((&plist :name :fn) (cdr it)))
;; Save original function.
(push (list :name name :fn (symbol-function name)) orig-fns)
;; Temporarily set new function definition.
(fset name fn)))
;; Run query on buffers.
(->> buffers
(--map (with-current-buffer it
(unless (derived-mode-p 'org-mode)
(user-error "Not an Org buffer: %s" (buffer-name)))
(org-ql--select-cached :query query :preamble preamble :preamble-case-fold preamble-case-fold
:predicate predicate :action action :narrow narrow)))
(-flatten-n 1)))
(--each orig-fns
;; Restore original function mappings.
(-let (((&plist :name :fn) it))
(fset name fn)))))))
;; Sort items
(pcase sort
(`nil items)
((guard (cl-loop for elem in (-list sort)
always (memq elem '(date deadline scheduled todo priority random))))
;; Default sorting functions
(org-ql--sort-by items (-list sort)))
;; Sort by user-given comparator.
((pred functionp) (sort items sort))
(_ (user-error "SORT must be either nil, one or a list of the defined sorting methods (see documentation), or a comparison function of two arguments")))))
;;;###autoload
(cl-defun org-ql-query (&key (select 'element-with-markers) from where narrow order-by)
"Like `org-ql-select', but arguments are named more like a SQL query.
SELECT corresponds to the `org-ql-select' argument ACTION. It is
the function called on matching headings, the results of which
are returned by this function. It may be:
- `element' or nil: Equivalent to `org-element-headline-parser'.
- `element-with-markers': Equivalent to
`org-element-headline-parser', with markers added using
`org-ql--add-markers'. Suitable for formatting with
`org-ql-view--format-element', allowing insertion into an Org
Agenda-like buffer.
- A sexp, which will be byte-compiled into a lambda function.
- A function symbol.
FROM corresponds to the `org-ql-select' argument BUFFERS-OR-FILES.
It may be one or a list of file paths and/or buffers.
WHERE corresponds to the `org-ql-select' argument QUERY. It
should be an `org-ql' query sexp.
ORDER-BY corresponds to the `org-ql-select' argument SORT, which
see.
NARROW corresponds to the `org-ql-select' argument NARROW."
(declare (indent 0))
(org-ql-select from where
:action select
:narrow narrow
:sort order-by))
(defun org-ql--select-cached (&rest args)
"Return results for ARGS and current buffer using cache."
;; MAYBE: Timeout cached queries. Probably not necessarily since they will be removed when a
;; buffer is closed, or when a query is run after modifying a buffer.
(-let* (((&plist :query :preamble :action :narrow :preamble-case-fold) args)
(query-cache-key
;; The key must include the preamble, because some queries are replaced by
;; the preamble, leaving a nil query, which would make the key ambiguous.
(list :query query :preamble preamble :action action :preamble-case-fold preamble-case-fold
(if narrow
;; Use bounds of narrowed portion of buffer.
(cons (point-min) (point-max))
nil))))
(if-let* ((buffer-cache (gethash (current-buffer) org-ql-cache))
(query-cache (cadr buffer-cache))
(modified-tick (car buffer-cache))
(buffer-unmodified-p (eq (buffer-modified-tick) modified-tick))
(cached-result (gethash query-cache-key query-cache)))
(pcase cached-result
('org-ql-nil nil)
(_ cached-result))
(let ((new-result (apply #'org-ql--select args)))
(cond ((or (not query-cache)
(not buffer-unmodified-p))
(puthash (current-buffer)
(list (buffer-modified-tick)
(let ((table (make-hash-table :test 'org-ql-hash-test)))
(puthash query-cache-key (or new-result 'org-ql-nil) table)
table))
org-ql-cache))
(t (puthash query-cache-key (or new-result 'org-ql-nil) query-cache)))
new-result))))
(cl-defun org-ql--select (&key preamble preamble-case-fold predicate action narrow
&allow-other-keys)
"Return results of mapping function ACTION across entries in current buffer matching function PREDICATE.
If NARROW is non-nil, buffer will not be widened."
;; Since the mappings are stored in the variable `org-ql-predicates', macros like `flet'
;; can't be used, so we do it manually (this is same as the equivalent `flet' expansion).
;; Mappings are stored in the variable because it allows predicates to be defined with a
;; macro, which allows documentation to be easily generated for them.
(save-excursion
(save-restriction
(unless narrow
(widen))
(goto-char (point-min))
(when (and (org-before-first-heading-p)
(not (org-at-heading-p)))
(outline-next-heading))
(if (not (org-at-heading-p))
(progn
;; No headings in buffer: return nil.
(unless (string-prefix-p " " (buffer-name))
;; Not a special, hidden buffer: show message, because if a user accidentally
;; searches a buffer without headings, he might be confused.
(message "org-ql: No headings in buffer: %s" (current-buffer)))
nil)
;; Find matching entries.
;; TODO: Bind `case-fold-search' around the preamble loop.
(cond (preamble (cl-loop while (let ((case-fold-search preamble-case-fold))
(re-search-forward preamble nil t))
do (outline-back-to-heading 'invisible-ok)
when (funcall predicate)
collect (funcall action)
do (outline-next-heading)))
(t (cl-loop when (funcall predicate)
collect (funcall action)
while (outline-next-heading))))))))
;;;;; Helpers
(defun org-ql--tags-at (position)
;; FIXME: This function actually assumes that point is already at POSITION.
"Return tags for POSITION in current buffer.
Returns cons (INHERITED-TAGS . LOCAL-TAGS)."
;; I'd like to use `-if-let*', but it doesn't leave non-nil variables
;; bound in the else clause, so destructured variables that are non-nil,
;; like found caches, are not available in the else clause.
(if-let* ((buffer-cache (gethash (current-buffer) org-ql-tags-cache))
(modified-tick (car buffer-cache))
(tags-cache (cdr buffer-cache))
(buffer-unmodified-p (eq (buffer-modified-tick) modified-tick))
(cached-result (gethash position tags-cache)))
;; Found in cache: return them.
;; FIXME: Isn't `cached-result' a list of (INHERITED . LOCAL)? It
;; will never be just `org-ql-nil', but the CAR and CDR may be, so
;; they need to each be checked and replaced with nil if necessary.
(pcase cached-result
('org-ql-nil nil)
(_ cached-result))
;; Not found in cache: get tags and cache them.
(let* ((local-tags (or (when (looking-at org-ql-tag-line-re)
(split-string (match-string-no-properties 2) ":" t))
'org-ql-nil))
(inherited-tags (or (when org-use-tag-inheritance
(save-excursion
(org-with-wide-buffer
(if (org-up-heading-safe)
;; Return parent heading's tags.
(-let* (((inherited local) (org-ql--tags-at (point)))
(tags (when (or inherited local)
(cond ((and (listp inherited)
(listp local))
(->> (append inherited local)
-non-nil -uniq))
((listp inherited) inherited)
((listp local) local)))))
(cl-typecase org-use-tag-inheritance
(list (setf tags (-intersection tags org-use-tag-inheritance)))
(string (setf tags (--select (string-match org-use-tag-inheritance it)
tags))))
(pcase org-tags-exclude-from-inheritance
('nil tags)
(_ (-difference tags org-tags-exclude-from-inheritance))))
;; Top-level heading: use file tags.
org-file-tags))))
'org-ql-nil))
(all-tags (list inherited-tags local-tags)))
;; Check caches again, because they may have been set now.
;; TODO: Is there a clever way we could avoid doing this, or is it inherently necessary?
(setf buffer-cache (gethash (current-buffer) org-ql-tags-cache)
modified-tick (car buffer-cache)
tags-cache (cdr buffer-cache)
buffer-unmodified-p (eq (buffer-modified-tick) modified-tick))
(unless (and buffer-cache buffer-unmodified-p)
;; Buffer-local tags cache empty or invalid: make new one.
(setf tags-cache (make-hash-table))
(puthash (current-buffer)
(cons (buffer-modified-tick) tags-cache)
org-ql-tags-cache))
(puthash position all-tags tags-cache))))
(defun org-ql--outline-path ()
"Return outline path for heading at point."
(save-excursion
(let ((heading (save-match-data
(if (looking-at org-complex-heading-regexp)
(or (match-string 4) "")
""))))
(if (org-up-heading-safe)
;; MAYBE: It seems wrong to call the cache function from
;; inside this function, like a violation of separation of
;; concern. Can this be rewritten to not work that way?
(append (org-ql--value-at (point) #'org-ql--outline-path)
(list heading))
(list heading)))))
;; TODO: Use --value-at for tags cache.
(defun org-ql--value-at (position fn)
;; TODO: Either rename to `value-at-point' and remove `position' arg, or move point.
"Return FN's value at POSITION in current buffer.
Values compared with `equal'."
;; I'd like to use `-if-let*', but it doesn't leave non-nil variables
;; bound in the else clause, so destructured variables that are non-nil,
;; like found caches, are not available in the else clause.
(pcase (if-let* ((buffer-cache (gethash (current-buffer) org-ql-node-value-cache))
(modified-tick (car buffer-cache))
(position-cache (cdr buffer-cache))
(buffer-unmodified-p (eq (buffer-modified-tick) modified-tick))
(value-cache (gethash position position-cache))
(cached-value (alist-get fn value-cache nil nil #'equal)))
;; Found in cache: return it.
cached-value
;; Not found in cache: call FN, cache and return its value.
(let ((new-value (or (funcall fn) 'org-ql-nil)))
;; Check caches again, because it may have been set now, e.g. by
;; recursively going up an outline tree.
;; TODO: Is there a clever way we could avoid doing this, or is it inherently necessary?
(setf buffer-cache (gethash (current-buffer) org-ql-node-value-cache)
modified-tick (car buffer-cache)
position-cache (cdr buffer-cache)
value-cache (when position-cache
(gethash position position-cache))
buffer-unmodified-p (eq (buffer-modified-tick) modified-tick))
(unless (and buffer-cache buffer-unmodified-p)
;; Buffer-local node cache empty or invalid: make new one.
(setf position-cache (make-hash-table)
value-cache (gethash position position-cache))
(puthash (current-buffer)
(cons (buffer-modified-tick) position-cache)
org-ql-node-value-cache))
(setf (alist-get fn value-cache nil nil #'equal) new-value)
(puthash position value-cache position-cache)
new-value))
;; Return nil or the non-nil value.
('org-ql-nil nil)
(else else)))
(defun org-ql--add-markers (element)
"Return ELEMENT with Org marker text properties added.
ELEMENT should be an Org element like that returned by
`org-element-headline-parser'. This function should be called
from within ELEMENT's buffer."
;; NOTE: `org-agenda-new-marker' works, until it doesn't, because...I don't know. It sometimes
;; raises errors or returns markers that don't point into a buffer. `copy-marker' always works,
;; of course, but maybe it will leave "dangling" markers, which could affect performance over
;; time? I don't know, but for now, it seems that we have to use `copy-marker'.
(let* ((marker (copy-marker (org-element-property :begin element)))
(properties (--> (cadr element)
(plist-put it :org-marker marker)
(plist-put it :org-hd-marker marker))))
(setf (cadr element) properties)
element))
(defun org-ql--ask-unsafe-query (query)
"Signal an error if user rejects running QUERY.
If `org-ql-view-ask-unsafe-links' is nil, does nothing and
returns nil."
(when org-ql-ask-unsafe-queries
(let ((query-string (propertize (cl-etypecase query
(list (prin1-to-string query))
(string query))
'face 'font-lock-warning-face)))
(unless (yes-or-no-p (concat "Query is in sexp form and could contain arbitrary code: "
query-string " Execute it? "))
(user-error "Query aborted by user")))))
;;;;; Query processing
;; Processing, compiling, etc. for queries.
;; This error is used for when compiling a query signals an error,
;; making it easier for the UI to avoid spurious warnings, e.g. for
;; partially typed queries in the Helm commands.
(define-error 'org-ql-invalid-query "Invalid Org QL query" 'user-error)
(defun org-ql--sanity-check-form (form)
"Signal error if any forms in FORM do not have preconditions met.
Or, when possible, fix the problem."
(cl-flet ((check (symbol)
(cl-case symbol
('done (unless org-done-keywords
;; NOTE: This check needs to be done from within the Org buffer being checked.
(error "Variable `org-done-keywords' is nil. Are you running this from an Org buffer?"))))))
(cl-loop for elem in form
if (consp elem)
do (progn
(check (car elem))
(org-ql--sanity-check-form (cdr elem)))
else do (check elem))))
(cl-defun org-ql--link-regexp (&key description-or-target description target)
"Return a regexp matching Org links according to arguments.
Each argument is treated as a regexp (so non-regexp strings
should be quoted before being passed to this function). If
DESCRIPTION-OR-TARGET, match it in either description or target.
If DESCRIPTION, match it in the description. If TARGET, match it
in the target. If both DESCRIPTION and TARGET, match both,
respectively."
(cl-labels
((no-desc
(match) (rx-to-string `(seq (or bol (1+ blank))
"[[" (0+ (not (any "]"))) (regexp ,match) (0+ (not (any "]")))
"]]")))
(match-both
(description target)
(rx-to-string `(seq (or bol (1+ blank))
"[[" (0+ (not (any "]"))) (regexp ,target) (0+ (not (any "]")))
"][" (0+ (not (any "]"))) (regexp ,description) (0+ (not (any "]")))
"]]")))
;; Note that these actually allow empty descriptions
;; or targets, depending on what they are matching.
(match-desc
(match) (rx-to-string `(seq (or bol (1+ blank))
"[[" (0+ (not (any "]")))
"][" (0+ (not (any "]"))) (regexp ,match) (0+ (not (any "]")))
"]]")))
(match-target
(match) (rx-to-string `(seq (or bol (1+ blank))
"[[" (0+ (not (any "]"))) (regexp ,match) (0+ (not (any "]")))
"][" (0+ (not (any "]")))
"]]"))))
(cond (description-or-target
(rx-to-string `(or (regexp ,(no-desc description-or-target))
(regexp ,(match-desc description-or-target))
(regexp ,(match-target description-or-target)))))
((and description target)
(match-both description target))
(description (match-desc description))
(target (rx-to-string `(or (regexp ,(no-desc target))
(regexp ,(match-target target))))))))
(defun org-ql--format-src-block-regexp (&optional lang)
"Return regexp equivalent to `org-babel-src-block-regexp' with LANG filled in."
;; I couldn't find a way to match block contents without the regexp
;; also matching past the end of the block and into later blocks. Even
;; using `minimal-match' in several different combinations didn't work.
;; So matching contents will have to be done with the predicate.
(rx-to-string `(seq bol (group (zero-or-more (any " ")))
"#+begin_src"
(one-or-more (any " "))
,(or lang `(1+ (not (any " \n \f "))))
(zero-or-more (any " "))
(group (or (seq (zero-or-more (not (any "\n\":")))
"\""
(zero-or-more (not (any "\n\"*")))
"\""
(zero-or-more (not (any "\n\":"))))
(zero-or-more (not (any "\n\":")))))
(group (zero-or-more (not (any "\n")))) "\n"
(63 (group (*\? (not (any " "))) "\n"))
(zero-or-more (any " "))
"#+end_src")
t))
(defun org-ql--byte-compile-warning (_string _pos _fill level)
"Signal an `org-ql-invalid-query' error.
Arguments STRING, POS, FILL, and LEVEL are according to
`byte-compile-log-warning-function'."
;; Used as the `byte-compile-log-warning-function' in `org-ql--query-preamble'.
(signal 'org-ql-invalid-query level))
(defun org-ql--query-predicate (query)
"Return predicate function for QUERY."
;; Use custom log function to prevent warnings for e.g. partially typed queries.
(let ((byte-compile-log-warning-function #'org-ql--byte-compile-warning))
(byte-compile
`(lambda ()
(cl-macrolet ((clocked (&key from to on)
(org-ql--from-to-on)
`(org-ql--predicate-clocked :from ,from :to ,to))
(closed (&key from to on)
(org-ql--from-to-on)
`(org-ql--predicate-closed :from ,from :to ,to))
(deadline (&key from to on)
(org-ql--from-to-on)
`(org-ql--predicate-deadline :from ,from :to ,to))
(planning (&key from to on)
(org-ql--from-to-on)
`(org-ql--predicate-planning :from ,from :to ,to))
(scheduled (&key from to on)
(org-ql--from-to-on)
`(org-ql--predicate-scheduled :from ,from :to ,to))
(ts (&key from to on (type 'both))
(org-ql--from-to-on)
`(org-ql--predicate-ts :from ,from :to ,to
:regexp ,(pcase type
('both org-tsr-regexp-both)
('active org-tsr-regexp)
('inactive org-ql-tsr-regexp-inactive)))))
,query)))))
;;;;; String query parsing
;; This section implements parsing of "plain," non-Lisp queries using the `peg'
;; library. NOTE: This needs to appear after the predicates are defined.
(require 'peg)
(defun org-ql--def-query-string-to-sexp-fn (predicates)
"Define function `org-ql--query-string-to-sexp' according to PREDICATES.
Builds the PEG expression using PREDICATES (which should be the
value of `org-ql-predicates')."
(let* ((names (--map (symbol-name (plist-get (cdr it) :name))
predicates))
(aliases (->> predicates
(--map (plist-get (cdr it) :aliases))
-non-nil
-flatten
(-map #'symbol-name)))
(predicate-names (->> (append names aliases)
-uniq
;; Sort the keywords longest-first to work around what seems to be an
;; obscure bug in `peg': when one keyword is a substring of another,
;; and the shorter one is listed first, the shorter one fails to match.
(-sort (-on #'> #'length))))
(pexs `((query (+ term
(opt (+ (syntax-class whitespace) (any)))))
(term (or (and negation (list positive-term)
;; This is a bit confusing, but it seems to work. There's probably a better way.
`(pred -- (list 'not (car pred))))
positive-term))
(positive-term (or (and predicate-with-args `(pred args -- (cons (intern pred) args)))
(and predicate-without-args `(pred -- (list (intern pred))))
(and plain-string `(s -- (list 'regexp s)))))
(plain-string (or quoted-arg unquoted-arg))
(predicate-with-args (substring predicate) ":" args)
(predicate-without-args (substring predicate) ":")
(predicate (or ,@predicate-names))
(args (list (+ (and (or keyword-arg quoted-arg unquoted-arg) (opt separator)))))
(keyword-arg (and keyword "=" `(kw -- (intern (concat ":" kw)))))
(keyword (substring (+ (not (or separator "=" "\"" (syntax-class whitespace))) (any))))
(quoted-arg "\"" (substring (+ (not (or separator "\"")) (any))) "\"")
(unquoted-arg (substring (+ (not (or separator "\"" (syntax-class whitespace))) (any))))
(negation "!")
(separator "," )))
(closure (lambda (input &optional boolean)
"Return query parsed from plain query string INPUT.
Multiple predicate-names are combined with BOOLEAN (default: `and')."
;; HACK: Silence unused lexical variable warnings.
(ignore predicates predicate-names names aliases)
(unless (s-blank-str? input)
(let* ((boolean (or boolean 'and))
(parsed-sexp
(with-temp-buffer
(insert input)
(goto-char (point-min))
;; Copied from `peg-parse'. There is no function in `peg' that
;; returns a matcher function--every entry point is a macro,
;; which means that, since we define our PEG rules at runtime when
;; predicate-names are defined, we either have to use `eval', or we
;; have to borrow some code. It ends up that we only have to
;; borrow this `with-peg-rules' call, which isn't too bad.
(eval `(with-peg-rules ,pexs
(peg-run (peg ,(caar pexs)) #'peg-signal-failure))))))
(pcase parsed-sexp
(`(,one-predicate) one-predicate)
(`(,_ . ,_) (cons boolean (reverse parsed-sexp)))
(_ nil)))))))
(fset 'org-ql--query-string-to-sexp closure)))
;;;;; Predicate definition
;; HACK: These functions *will* be defined at runtime, so we silence
;; compiler warnings about them:
(declare-function org-ql--normalize-query "ext:org-ql" (query) t)
(declare-function org-ql--query-preamble "ext:org-ql" (query) t)
(defvar org-ql-defpred-defer nil
"Defer expensive function redefinitions when defining predicates.
When non-nil, defining a predicate with `org-ql-defpred' does not
cause the functions `org-ql--normalize-query',
`org-ql--query-preamble', and `org-ql--query-string-to-sexp' to
be redefined. These functions must be redefined in order to
account for new predicates, but when defining many
predicates (like at load time), that may be deferred for
performance (after which those functions should be updated
manually; see the definition of `org-ql-defpred').")
;; Yes, these two functions are a little hairy: `pcase' is challenging
;; enough, but splicing forms into one is something else. But it's
;; worth it to do this ugly stuff here, in one place, so the
;; `org-ql-defpred' macro becomes easy to use.
(defun org-ql--define-normalize-query-fn (predicates)
"Define function `org-ql--normalize-query' for PREDICATES.
PREDICATES should be the value of `org-ql-predicates'."
(let ((normalizer-patterns (->> predicates
(--map (plist-get (cdr it) :normalizers))
(-flatten-n 1))))
(fset 'org-ql--normalize-query
(byte-compile
`(lambda (query)
"Return normalized form of QUERY expression.
This function is defined by calling
`org-ql--define-normalize-query-fn', which uses normalizer forms
defined in `org-ql-predicates' by calling `org-ql-defpred'."
(cl-labels ((org-ql-normalize-query (element)
(pcase element
((pred stringp) `(regexp ,element))
,@normalizer-patterns
;; Any other form: passed through unchanged.
(_ element))))
(org-ql-normalize-query query)))))))
(defun org-ql--define-query-preamble-fn (predicates)
"Define function `org-ql--query-preamble' for PREDICATES.
PREDICATES should be the value of `org-ql-predicates'."
;; NOTE: I don't how the `list' symbol ends up in the list, but anyway...
(let* ((preamble-patterns
(-flatten-n 1 (-non-nil
;; NOTE: Using -let instead of pcase-let here because I can't make map 2.1 install in the test sandbox.
(--map (-let* (((&plist :preambles) (cdr it)))
(--map (pcase-let* ((`(,pattern ,exp) it))
`(,pattern ,exp))
preambles))
predicates)))))
(fset 'org-ql--query-preamble
`(lambda (query)
"Return preamble data plist for QUERY.
The plist has the following keys:
:preamble Regexp to search the Org buffer for to find potential
matches. If the regexp doesn't guarantee a match to
QUERY, the :query key should be an appropriate query
expression to test against the heading (i.e. usually
QUERY again).
:preamble-case-fold What to bind variable `case-fold-search' to
around the regexp search.
:query The query expression to use instead of QUERY (or QUERY
again, when appropriate).
This function is defined by calling
`org-ql--define-query-preamble-fn', which uses preamble forms
defined in `org-ql-predicates' by calling `org-ql-defpred'."
(pcase org-ql-use-preamble
('nil (list :query query :preamble nil))
(_ (cl-labels ((org-ql-query-preamble (element)
(pcase element
,@preamble-patterns
(_ (list :query element)))))
(-let* (((&plist :regexp :case-fold :query) (org-ql-query-preamble query)))
(setq query (pcase query
((or `nil
`(nil)
`((nil))
`((and))
`((or)))
t)
(`(t) t)
(_ query)))
(list :query query :preamble regexp :preamble-case-fold case-fold)))))))
;; For some reason, byte-compiling the backquoted lambda form directly causes a warning
;; that `query' refers to an unbound variable, even though that's not the case, and the
;; function still works. But to avoid the warning, we byte-compile it afterward.
(byte-compile 'org-ql--query-preamble)))
(cl-defmacro org-ql-defpred (name args docstring &key body preambles normalizers)
"Define an `org-ql' selector predicate named `org-ql--predicate-NAME'.
NAME may be a symbol or a list of symbols: if a list, the first
is used as NAME and the rest are aliases. A function is only
created for NAME, not for aliases, so a normalizer should be used
to replace aliases with NAME in queries (keep reading).
ARGS is a `cl-defun'-style argument list. DOCSTRING is the
function's docstring.
BODY is the body of the predicate. It will be evaluated with
point on the beginning of an Org heading and should return
non-nil if the heading's entry is a match.
PREAMBLES and NORMALIZERS are lists of `pcase' forms matched
against Org QL query sexps. They are spliced into `pcase' forms
in the definitions of the functions `org-ql--query-preamble' and
`org-ql--normalize-query', which see. Those functions are
redefined when this macro is expanded, unless variable
`org-ql-defpred-defer' is non-nil, in which case those functions
should be redefined manually after defining predicates by calling
`org-ql--define-query-preamble-fn' and `org-ql--define-normalize-query-fn'.
NORMALIZERS are used to normalize query expressions to standard
forms. For example, when the predicate has aliases, the aliases
should be replaced with predicate names using a normalizer.
Also, predicate arguments may be put into a more optimal form so
that the predicate has less work to do at query time.
PREAMBLES refer to regular expressions which may be used to
search through a buffer directly to a potential match rather than
testing the predicate body on each heading. (Naming things is
hard.) In each `pcase' form in PREAMBLES, the `pcase'
expression (not the pattern) should be a plist with the following
keys, each value of which should be an expression which may refer
to variables bound in the pattern:
:regexp Regular expression which searches directly to a
potential match.
:case-fold Bound to `case-fold-search' around the regexp search.
:query Expression which should replace the query expression,
or `query' if it should not be changed (e.g. if the
regexp is insufficient to determine whether a
heading matches, in which case the predicate's body
needs to be tested on the heading). If the regexp
guarantees a match, this may be simply t, leaving the
query expression with no work to do, which improves
performance.
For convenience, within the `pcase' patterns, the symbol
`predicate-names' is a special form which is replaced with a
pattern matching any of the predicate's name and aliases. For
example, if NAME were:
(heading h)
Then if NORMALIZERS were:
((`(,predicate-names . ,args)
`(heading ,@args)))
It would be expanded to:
((`(,(or 'heading 'h) . ,args)
`(heading ,@args)))
Also, `org-ql-normalize-query' and `org-ql-query-preamble' are defined
locally inside (respectively) normalizer and preamble forms. They can
be used to perform normalization or generate preambles recursively.
Example:
The following naive definition will not normalize QUERIES passed to
the predicate.
(org-ql-defpred myxor (&rest _)
\"Apply boolean xor operation.\"
:normalizers ((`(,predicate-names . ,queries)
`(xor ,@queries))))
More optimal definition would be:
(org-ql-defpred myxor (&rest _)
\"Apply boolean xor operation.\"
:normalizers ((`(,predicate-names . ,queries)
`(xor ,@(mapcar #'org-ql-normalize-query queiries)))))"
;; NOTE: The debug form works, completely! For example, use `edebug-defun'
;; on the `heading' predicate, then evaluate this form:
;; (let* ((query '(heading "HEADING"))
;; (normalized (org-ql--normalize-query query))
;; (preamble (org-ql--query-preamble normalized)))
;; (list :query query
;; :normalized normalized
;; :preamble preamble))
(declare (debug ([&or symbolp listp] listp stringp
&rest [&or [":body" def-body]
[":normalizers" (&rest (sexp def-body))]
[":preambles" (&rest (sexp def-body))]]))
(indent defun))
(let* ((aliases (when (listp name)
(cdr name)))
(name (cl-etypecase name
(list (car name))
(atom name)))
(fn-name (intern (concat "org-ql--predicate-" (symbol-name name))))
(predicate-name (intern (symbol-name name)))
(predicate-names (delq nil (cons predicate-name aliases)))
(normalizers (cl-sublis (list (cons 'predicate-names (cons 'or (--map (list 'quote it) predicate-names))))
normalizers))
(preambles (cl-sublis (list (cons 'predicate-names (cons 'or (--map (list 'quote it) predicate-names))))
preambles)))
`(progn
(cl-defun ,fn-name ,args ,docstring ,body)
;; SOMEDAY: Use `map-elt' here, after map 2.1 can be automatically installed in CI sandbox...
(setf (alist-get ',predicate-name org-ql-predicates)
`(:name ,',name :aliases ,',aliases :fn ,',fn-name :docstring ,(\, docstring) :args ,',args
:normalizers ,',normalizers :preambles ,',preambles))
(unless org-ql-defpred-defer
;; Reversing preserves the order in which predicates were defined.
(org-ql--define-normalize-query-fn (reverse org-ql-predicates))
(org-ql--define-query-preamble-fn (reverse org-ql-predicates))
(org-ql--def-query-string-to-sexp-fn (reverse org-ql-predicates))))))
(defmacro org-ql--from-to-on ()
"For internal use.
Expands into a form that processes arguments to timestamp-related
predicates."
;; Several attempts to use `cl-macrolet' and `cl-symbol-macrolet' failed, so I
;; resorted to this top-level macro. It will do for now.
`(progn
(when on
(setq from on
to on))
(when from
(setq from (pcase from
((or 'today "today") (->> (ts-now)
(ts-apply :hour 0 :minute 0 :second 0)))
((pred numberp) (->> (ts-now)
(ts-adjust 'day from)
(ts-apply :hour 0 :minute 0 :second 0)))
((and (pred stringp)
(guard (ignore-errors (cl-parse-integer from))))
;; The `pcase' `let' pattern doesn't bind values in the
;; body forms, so we have to parse the integer again.
(->> (ts-now)
(ts-adjust 'day (cl-parse-integer from))
(ts-apply :hour 0 :minute 0 :second 0)))
((pred stringp) (ts-parse-fill 'begin from))
((pred ts-p) from))))
(when to
(setq to (pcase to
((or 'today "today") (->> (ts-now)
(ts-apply :hour 23 :minute 59 :second 59)))
((pred numberp) (->> (ts-now)
(ts-adjust 'day to)
(ts-apply :hour 23 :minute 59 :second 59)))
((and (pred stringp)
(guard (ignore-errors (cl-parse-integer to))))
;; The `pcase' `let' pattern doesn't bind values in the
;; body forms, so we have to parse the integer again.
(->> (ts-now)
(ts-adjust 'day (cl-parse-integer to))
(ts-apply :hour 23 :minute 59 :second 59)))
((pred stringp) (ts-parse-fill 'end to))
((pred ts-p) to))))))