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okamsn edited this page Oct 31, 2020 · 100 revisions

When creating commands based on Selectrum, try to think about whether they actually need to use selectrum-read specifically. Can you make them work using just completing-read? If so, your commands will be useful to everybody, not just Selectrum users!

Note: all commands on this page expect lexical binding to be enabled, and may fail otherwise. Add -*- lexical-binding: t -*- at the top fo the file!


Table of Contents

Fonts

Setting Font

Select the xfont for set for the system. This should be improved by displaying the fonts in a more friendly format. And (like counsel-fonts) providing a preview of the fonts next to the candidates.

(defun void/set-font ()
  "Select xfont."
  (interactive)
  (set-frame-font (completing-read "Choose font:" (x-list-fonts "*"))))

Kill Ring

yank-ring menu

  • yank-ring-pop behaves just like yank-pop. If there was no recent yank it opens a yank menu and inserts the chosen text.
  • yank-ring-replace opens a yank menu and replaces the recent yank with a chosen text.
  • yank-ring-insert opens a yank menu and inserts the chosen text.
  • this commands work nicely together with a hydra if desired.
(defun yank-ring-pop ()
  "If there is a recent yank act like `yank-pop'.
Otherwise choose text from the kill ring and insert it."
  (interactive)
  (if (eq last-command 'yank) (yank-pop) (call-interactively 'yank-ring-insert)))

(defun yank-ring-read ()
  "Open kill ring menu and return chosen text."
  (completing-read "Ring: "
                   (cl-remove-duplicates kill-ring :test #'equal :from-end t)
                   nil ':require-match))

;; Replace just-yanked text with chosen text.
;; Adapted from the Emacs yank-pop function.
(defun yank-ring-replace (text)
  "Choose TEXT from the kill ring.
If there was no recent yank, insert the text.
Otherwise replace the just-yanked text with the chosen text."
  (interactive (list (yank-ring-read)))
  (if (not (eq last-command 'yank)) (yank-ring-insert text)
      (let ((inhibit-read-only t)
	    (before (< (point) (mark t))))
        (setq this-command 'yank)
        (if before
	    (funcall (or yank-undo-function 'delete-region) (point) (mark t))
          (funcall (or yank-undo-function 'delete-region) (mark t) (point)))
        (setq yank-undo-function nil)
        (set-marker (mark-marker) (point) (current-buffer))
        (insert-for-yank text)
        (set-window-start (selected-window) yank-window-start t)
        (if before
	    (goto-char (prog1 (mark t)
		         (set-marker (mark-marker) (point) (current-buffer)))))))
  nil)

;; Insert chosen text.
;; Adapted from the Emacs yank function.
(defun yank-ring-insert (text)
  "Choose TEXT from the kill ring and insert it."
  (interactive (list (yank-ring-read)))
  (setq yank-window-start (window-start))
  (push-mark)
  (insert-for-yank text)
  (setq this-command 'yank)
  nil)

(defhydra hydra-yank ()
  "yank"
  ("C-y" yank nil)
  ("y" yank-ring-pop "yank")
  ("r" yank-ring-replace "ring" :color blue)
  ("q" nil "quit"))

my-yank-pop

This is a command to replace the default yank-pop. It lets you choose in the kill-ring:

;; Ref: https://www.gnu.org/software/emacs/manual/html_node/eintr/yank.html
(defun my-yank-pop (&optional arg)
  "Paste a previously killed string.
With just \\[universal-argument] as ARG, put point at beginning,
and mark at end.  Otherwise, put point at the end, and mark at
the beginning without activating it.

This is like `yank-pop'.  The differences are:

- This let you manually choose a candidate to paste.

- This doesn't delete the text just pasted if the previous
  command is `yank'."
  (interactive "P")
  (let* ((selectrum-should-sort-p nil)
         (text nil))
    (setq text
          (completing-read "Yank: "
                           (cl-remove-duplicates
                            kill-ring :test #'equal :from-end t)
                           nil 'require-match))
    (unless (eq last-command 'yank)
      (push-mark))
    (setq last-command 'yank)
    (setq yank-window-start (window-start))
    (when (and delete-selection-mode (use-region-p))
      (delete-region (region-beginning) (region-end)))
    (insert-for-yank text)
    (if (consp arg)
        (goto-char (prog1 (mark t)
                     (set-marker (mark-marker) (point) (current-buffer)))))))

yank-pop+

This command also provides completion, but otherwise acts as close to the original yank-pop as possible.

(defun yank-pop+ (&optional arg)
 "Call `yank-pop' with ARG when appropriate, or offer completion."
 (interactive "*P")
 (if arg (yank-pop arg)
   (let* ((old-last-command last-command)
          (selectrum-should-sort-p nil)
          (enable-recursive-minibuffers t)
          (text (completing-read
                 "Yank: "
                 (cl-remove-duplicates
                  kill-ring :test #'string= :from-end t)
                 nil t nil nil))
          ;; Find `text' in `kill-ring'.
          (pos (cl-position text kill-ring :test #'string=))
          ;; Translate relative to `kill-ring-yank-pointer'.
          (n (+ pos (length kill-ring-yank-pointer))))
     (unless (string= text (current-kill n t))
       (error "Could not setup for `current-kill'"))
     ;; Restore `last-command' over Selectrum commands.
     (setq last-command old-last-command)
     ;; Delegate to `yank-pop' if appropriate or just insert.
     (if (eq last-command 'yank)
         (yank-pop n) (insert-for-yank text)))))

Isearch

You can use these commands to pick an element from isearch history and drop back into search:

(defun isearch--switch-direction-on-fail+ ()
  (when (isearch-fail-pos)
    (isearch-repeat-backward)))

(define-key isearch-mode-map (kbd "C-c r") 'isearch-history-from-isearch+)
(defun isearch-history-from-isearch+ ()
  (interactive)
  (with-isearch-suspended
   (let* ((history (if isearch-regexp
                       regexp-search-ring
                     search-ring))
          (selectrum-should-sort-p nil)
          (x (completing-read "Isearch History: " history)))
     (setq isearch-new-string x)
     (setq isearch-new-message x)))
  (isearch--switch-direction-on-fail+))

(global-set-key (kbd "C-c r") 'isearch-history+)
(defun isearch-history+ ()
  (interactive)
  (let* ((history (append (list (car search-ring)
                                (car regexp-search-ring))
                          (cdr search-ring)
                          (cdr regexp-search-ring)))
         (selectrum-should-sort-p nil)
         (x (completing-read "Isearch History: " history)))
    (isearch-forward (member x regexp-search-ring) t)
    (setq isearch-yank-flag t)
    (isearch-process-search-string
     x
     (mapconcat 'isearch-text-char-description x ""))
    (isearch--switch-direction-on-fail+)))

Jumping to Lines

Note: Previous versions of the commands selectrum-swiper and selectrum-outline had a more generic approach which used the standard completing-read function. To bypass some of Emacs's built-in limitations (which may change in the future) and to improve the experience regarding sorting and the default candidate, these commands were changed to use selectrum-read. If you wish to see/use the more generic versions, they are still accessible via the Page History button.

Swiper-like Jumping to Matching Lines

For those who want it, here is a command to jump to the beginning of a matching line. See also Using swiper in an org buffer.

(defvar selectrum-swiper-history nil "Submission history for `selectrum-swiper'.")
(autoload 'selectrum-read "selectrum")
(defun selectrum-swiper ()
  "Search for a matching line and jump to the beginning of its text.  Obeys narrowing."
  (interactive)
  (let* ((selectrum-should-sort-p nil)
         ;; Get the current line number for determining the travel distance.
         (current-line-number (line-number-at-pos (point) t))

         (default-cand-and-line-choices
           (cl-loop
            with minimum-line-number = (line-number-at-pos (point-min) t)
            with buffer-text-lines = (split-string (buffer-string) "\n")
            with number-format = (concat
                                  "L%0"
                                  (number-to-string
                                   (length (number-to-string
                                            (length buffer-text-lines))))
                                  "d: ")

            with closest-candidate = nil
            with distance-to-current-line = nil
            with smallest-distance-to-current-line = most-positive-fixnum

            with formatted-line = nil
            with formatted-lines = nil

            for txt in buffer-text-lines
            for num = minimum-line-number then (1+ num)
            unless (string-empty-p txt) ; Just skip empty lines.
            do
            (setq formatted-line (propertize
                                  txt
                                  'selectrum-candidate-display-prefix
                                  (propertize
                                   (format number-format num)
                                   'face 'completions-annotations)
                                  'line-num num)
                  distance-to-current-line (abs (- current-line-number num)))
            (push formatted-line formatted-lines)
            (when (< distance-to-current-line
                     smallest-distance-to-current-line)
              (setq smallest-distance-to-current-line distance-to-current-line
                    closest-candidate formatted-line))
            finally return (cons closest-candidate
                                 (nreverse formatted-lines))))
         (default-cand (car default-cand-and-line-choices))
         (line-choices (cdr default-cand-and-line-choices))

         ;; Get the matching line.
         (chosen-line (selectrum-read "Jump to matching line: "
                                      line-choices
                                      :default-candidate default-cand
                                      :history 'selectrum-swiper-history
                                      :require-match t
                                      :no-move-default-candidate t))

         (chosen-line-number (get-text-property 0 'line-num chosen-line)))

    (push-mark (point) t)
    (forward-line (- chosen-line-number current-line-number))
    (beginning-of-line-text 1)))

Jumping to Outline Headings

Except for formatting the headings, this command is very similar to the above selectrum-swiper. It is functionally similar to counsel-outline. The current heading is the default candidate.

(autoload 'selectrum-read "selectrum")
((defvar selectrum-outline-history nil
  "History of chosen headings for `selectrum-outline'.")

(defcustom selectrum-outline-formats
  ;; Groups: (1) level determinant, (2) heading text.
  ;; The top level is 0, for a zero-length determinant.
  '((emacs-lisp-mode
     . "^;;;\\(?1:;*\\)[[:blank:]]*\\(?2:[[:alnum:]][^z-a]*\\)\\'")
    (markdown-mode
     . "^#\\(?1:#*\\)[[:blank:]]*\\(?2:[[:alnum:]][^z-a]*\\)\\'")
    (outline-mode
     . "^\\*\\(?1:\\**\\)[[:blank:]]*\\(?2:[[:alnum:]][^z-a]*\\)\\'")
    ;; For Org, see also `org-goto'.
    (org-mode
     . "^\\*\\(?1:\\**\\)[[:blank:]]*\\(?2:[[:alnum:]][^z-a]*\\)\\'")
    (python-mode
     . "^##\\(?1:\\**\\|#*\\)[[:blank:]]*\\(?2:[[:alnum:]][^z-a]*\\)\\'"))
  "An alist of regexps to use for identifying outline headings, one for each major mode.

The `car' of an item in the list should be a symbol of the major mode.
The `cdr' should be a regular expression with two required match groups:
1. Match group 1, whose length determines the outline level of that heading.
   For best formatting, the top level should be level 0 for zero length.
2. Match group 2, which is the actual heading text.

A heading is assumed to be on only one line. "
  :group 'selectrum
  :type '(alist
          :key-type (symbol :tag "Major mode symbol")
          :value-type (string :tag "Regexp")))

;;;###autoload
(defun selectrum-outline ()
  "Jump to a heading.  Regexps are pre-defined.  Obeys narrowing."
  (interactive)
  ;; Signal a `user-error' if we don't have a regexp for this major mode.
  (if-let ((heading-regexp (alist-get major-mode selectrum-outline-formats)))
      (let ((selectrum-should-sort-p nil) ; Headings should stay in order of appearance.
            ;; Get the basic information of each heading in the accessible
            ;; portion of the buffer.
            (buffer-lines (split-string (buffer-string) "\n"))
            (line-number 0)
            (line-number-format)

            ;; Finding the default heading
            (default-heading)
            (current-line-number (line-number-at-pos (point)))

            ;; Keeping track of the tree.
            (backwards-prefix-list)
            (prev-heading-text)
            (prev-heading-level)

            ;; Backwards result of the `dolist'. Will `nreverse'.
            (formatted-headings))

        (setq line-number-format
              (concat "L%0"
                      (number-to-string
                       (length (number-to-string (length buffer-lines))))
                      "d: "))

        (save-match-data
          (dolist (text-line buffer-lines)
            ;; Increment line number when moving to next.
            (cl-incf line-number)
            (when (string-match heading-regexp text-line)
              (let ((heading-text (match-string-no-properties 2 text-line))
                    (heading-level
                     (length (match-string-no-properties 1 text-line)))
                    (formatted-heading))

                ;; Want to make sure this has a correct value.
                (when (null prev-heading-level)
                  (setq prev-heading-level heading-level))

                ;; Decide whether to update the prefix list and the previous
                ;; heading level.
                (cond
                  ;; If we've moved to a greater level (further down the tree),
                  ;; add the previous heading to the heading prefix list so
                  ;; that we can prepend it to the current heading when
                  ;; formatting.
                  ((> heading-level prev-heading-level)
                   (setq backwards-prefix-list (cons prev-heading-text
                                                     backwards-prefix-list)
                         prev-heading-level heading-level))
                  ;; Otherwise, if we've moved to a lower level (higher up the
                  ;; tree), and need to remove the most recently added prefix
                  ;; from the list (i.e., go from '(c b a) back to '(b a)).
                  ((< heading-level prev-heading-level)
                   (setq backwards-prefix-list (last backwards-prefix-list
                                                     heading-level)
                         prev-heading-level heading-level))
                  ;; Otherwise, do nothing.
                  (t nil))

                ;; Regardless of what happens, update the previous heading text.
                (setq prev-heading-text heading-text)

                ;; Decide whether the previous formatted heading was the
                ;; default.
                (when (and (null default-heading)
                           (> (- line-number current-line-number) 0))
                  (setq default-heading (car formatted-headings)))

                ;; Finally, add to list of formatted headings.
                ;; Create heading of form "L#: a/b/c" as:
                ;; - having a text property holding the line number
                ;; - prepended with a formatted line number,
                ;;   with the face `completions-annotations'.
                (push (propertize
                       (concat (string-join (reverse backwards-prefix-list) "/")
                               (and backwards-prefix-list "/")
                               heading-text)
                       'line-number line-number
                       'selectrum-candidate-display-prefix
                       (propertize
                        (format line-number-format line-number)
                        'face 'completions-annotations))
                      formatted-headings)))))

        ;; Now that candidates formatted, select from candidates.
        (let ((chosen-heading
               (selectrum-read "Jump to heading: "
                               (nreverse formatted-headings)
                               :default-candidate default-heading
                               :history 'selectrum-outline-history
                               :require-match t
                               :no-move-default-candidate t)))
          ;; Push mark, in case we want to return to current location.  This
          ;; needs to happen /after/ the user has made it clear that they want
          ;; to go somewhere.
          (push-mark (point) t)
          ;; Move to beginning of chosen line.
          (forward-line (- (get-text-property 0 'line-number chosen-heading)
                           current-line-number))
          (beginning-of-line-text 1)))
    (user-error "selectrum-outline: No headings defined for %s." major-mode)))

Keyboard Macros

The formatting of macros is a bit different in different Emacs versions. In Emacs 26, the function edmacro-fix-menu-commands throws an error when it tries to handle a mouse click. In Emacs 27.0.91, it looks like mouse clicks are silently removed from the formatting.

(defvar kmacro-ring)
(defvar kmacro-counter)
(defvar kmacro-counter-format)
(declare-function kmacro-call-macro "kmacro")

;;;###autoload
(defun selectrum-kmacro (arg)
  "Run a chosen keyboard macro.  With prefix ARG, run the macro that many times.

Macros containing mouse clicks can't be displayed properly.  To keep things simple,
macros with an empty display string (e.g., ones made entirely of mouse clicks)
are not shown."
  (interactive "p")
  (if (or last-kbd-macro kmacro-ring)
      (let* ((selectrum-should-sort-p nil)
             ;; The most recent macro is not on the ring,so must include it explicitly.
             (all-kmacros (cons (if (listp last-kbd-macro)
                                    last-kbd-macro
                                  (list last-kbd-macro
                                        kmacro-counter
                                        kmacro-counter-format))
                                kmacro-ring))
             ;; Give the actual kmacro a number, which we use for rotating/cycling the ring.
             ;; Mouse clicks are removed by the format function. Decided to remove resulting
             ;; empty strings, since their meaning would be confusing.
             (formatted-kmacros
              (mapcar (lambda (kmacro)
                        (propertize (condition-case nil
                                        (format-kbd-macro (if (listp kmacro) (car kmacro) kmacro) 1)
                                      ;; Recover from error from `edmacro-fix-menu-commands'.
                                      ;; In Emacs 27, it looks like mouse events are silently skipped over.
                                      (error "Warning: Cannot display macros containing mouse clicks"))
                                    'selectrum-candidate-display-prefix
                                    (when (consp kmacro)
                                      (concat (number-to-string (cadr kmacro))
                                              "," (caddr kmacro) ": "))))
                      all-kmacros))
             (numbered-kmacros
              (seq-remove #'null (seq-map-indexed (lambda (kmacro index)
                                                    (unless (string-empty-p kmacro)
                                                      (cons kmacro index)))
                                                  formatted-kmacros)))
             ;; The index corresponding to the chosen kmacro.
             (chosen-kmacro-number (alist-get
                                    (completing-read "Select kmacro: " numbered-kmacros nil t)
                                    numbered-kmacros
                                    nil nil #'string=)))
        (if (= chosen-kmacro-number 0)
            ;; If 0, just run the current (last) macro.
            (kmacro-call-macro (or arg 1) t nil)
          ;; Otherwise, run a kmacro from the ring.
          ;; Get actual index, since we prepended `kmacro-ring'
          ;; with `last-kbd-macro' in selection.
          (let ((actual-index (1- chosen-kmacro-number)))
            ;; Temporarily change the variables to retrieve the correct
            ;; settings.  Mainly, want the macro counter to persist, which
            ;; automatically happens when cycling the ring.
            (seq-let (last-kbd-macro kmacro-counter kmacro-counter-format-start)
                (nth actual-index kmacro-ring)
              (kmacro-call-macro (or arg 1) t)
              ;; Once done, put updated variables back into the ring.
              (setf (seq-elt kmacro-ring actual-index)
                    (list last-kbd-macro
                          kmacro-counter
                          kmacro-counter-format))))))
    (user-error "selectrum-kmacro: No keyboard macros defined.")))

Markers

The Mark Ring

While pop-to-mark-command is good for quickly returning to a previous location, it is nice to have more context when trying to go further back in the mark ring. The following command shows the line and position of each mark in mark-ring, representing the mark location as a highlighted |. The | is highlighted using the face selectrum-marks-highlight, which by default inherits from the face highlight.

(defface selectrum-marks-highlight '((t :inherit highlight))
  "Face used to highlight the position of the mark in `selectrum-marks'."
  :group 'selectrum)

(defvar selectrum--marks-history ()
  "History for the command `selectrum-marks'.
This is probably not so useful, since marks can move with text.")

;;;###autoload
(defun selectrum-marks ()
  "Jump to a marker in `mark-ring', signified by a highlighted \"|\" (the vertical bar character).
Currently truncates line if longer than window body width."
  (interactive)
  (if (null (marker-position (mark-marker)))
      ;; If the first marker is not placed (though it probably exists),
      ;; assume that no valid marks exist.
      (user-error "selectrum-marks: No marks currently exist.")
    (let* ((selectrum-should-sort-p nil)
           (formatted-candidates
            (save-excursion
              (cl-loop with window-width = (window-body-width (minibuffer-window))
                       for marker in (cons (mark-marker)
                                           ;; Some markers have the same position,
                                           ;; so we skip them.
                                           (cl-remove-duplicates
                                            mark-ring
                                            :test (lambda (m1 m2)
                                                    (= (marker-position m1)
                                                       (marker-position m2)))))
                       ;; Since we need to go to the marker's position anyway,
                       ;; we get and go to the position in one step.
                       ;; Since `mark-ring' is buffer local, we assume that
                       ;; all markers in it have a valid position.
                       for pos          = (goto-char (marker-position marker))
                       for line-beg-pos = (line-beginning-position)
                       ;; Get where we'll show the marker in the candidate.
                       ;; NOTE: At some point, we'll want to make sure this
                       ;; is actually visible for long lines.
                       for str-pos      = (- pos line-beg-pos)
                       ;; Get the marker's context.
                       for line-string  = (buffer-substring
                                           line-beg-pos (line-end-position))
                       ;; Display the marker in the candidate.
                       for highlighted-candidate = (concat (substring line-string 0 str-pos)
                                                           (propertize
                                                            "|"
                                                            'face 'selectrum-marks-highlight)
                                                           (substring line-string str-pos))

                       ;; Create the final formatting of each candidate.
                       ;; Need to do formatting at end to make sure things are properly aligned.
                       collect pos                   into marker-positions
                       collect highlighted-candidate into highlighted-candidates

                       for      line-number =    (line-number-at-pos pos t)
                       collect  line-number into line-numbers
                       maximize line-number into max-line-number

                       collect  str-pos into column-numbers
                       maximize str-pos into max-col-number

                       finally return
                       (cl-loop with form = (concat "%0"   (number-to-string (length (number-to-string max-line-number)))
                                                    "d,%0" (number-to-string (length (number-to-string max-col-number)))
                                                    "d: %s")
                                for marker-pos in marker-positions
                                for line-num   in line-numbers
                                for col-num    in column-numbers
                                for cand       in highlighted-candidates
                                for str        =  (format form line-num col-num cand)
                                collect (cons (if (> (length str) window-width)
                                                  (concat (substring str 0 (- window-width 10)) "...")
                                                str)
                                              marker-pos)))))
           ;; Get the desired marker from the user.
           (chosen-cand (completing-read "Go to marker: " formatted-candidates nil
                                         t nil selectrum--marks-history)))
      ;; Go to the chosen marker.
      (goto-char (cdr (assoc chosen-cand formatted-candidates))))))

Evil Marks

There aren't many changes needed to create a version for Evil marks (created with m in normal state). Only formatting really changes from the above selectrum-marks.

(defface selectrum-marks-highlight '((t :inherit highlight))
  "Face used to highlight the position of the mark in `selectrum-marks'."
  :group 'selectrum)
(defvar evil-markers-alist)
(defun selectrum-evil-marks ()
  "Jump to a marker in `evil-marker-alist', signified by a highlighted \"|\".
Currently truncates line if longer than window body width."
  (interactive)
  (if-let ((placed-markers
            (sort (cl-remove-if (lambda (elem)
                                  (not (markerp (cdr-safe elem))))
                                evil-markers-alist)
                  #'car-less-than-car)))
      (let* ((selectrum-should-sort-p nil)
             (formatted-candidates
              (save-excursion
                (cl-loop with window-width = (window-body-width (minibuffer-window))
                         for (char-key . marker) in placed-markers
                         for pos          = (goto-char (marker-position marker))
                         for line-beg-pos = (line-beginning-position)
                         for str-pos      = (- pos line-beg-pos)
                         for line-string  = (buffer-substring
                                             line-beg-pos (line-end-position))
                         for highlighted-candidate = (concat (substring line-string 0 str-pos)
                                                             (propertize
                                                              "|"
                                                              'face 'selectrum-marks-highlight)
                                                             (substring line-string str-pos))
                         ;; Final formatting.
                         collect  char-key              into char-keys
                         collect  pos                   into marker-positions
                         collect  highlighted-candidate into highlighted-candidates
                         for      line-number           =    (line-number-at-pos pos t)
                         collect  line-number           into line-numbers
                         maximize line-number           into max-line-number
                         collect  str-pos               into column-numbers
                         maximize str-pos               into max-col-number
                         finally return
                         (cl-loop with form = (concat "%0"   (number-to-string (length (number-to-string max-line-number)))
                                                      "d,%0" (number-to-string (length (number-to-string max-col-number)))
                                                      "d: %s")
                                  for marker-pos in marker-positions
                                  for line-num   in line-numbers
                                  for col-num    in column-numbers
                                  for cand       in highlighted-candidates
                                  for str        =  (format form line-num col-num cand)
                                  for key        in char-keys
                                  collect (cons (propertize
                                                 (if (> (length str) window-width)
                                                     (concat (substring str 0 (- window-width 10)) "...")
                                                   str)
                                                 'selectrum-candidate-display-prefix (format "%c: " key))
                                                marker-pos)))))
             (chosen-cand (completing-read "Go to position: " formatted-candidates nil
                                           t nil selectrum--marks-history)))
        (goto-char (cdr (assoc chosen-cand formatted-candidates))))
    (user-error "selectrum-evil-marks: No Evil marks placed.")))

Org

Using swiper in an org buffer

In an org mode buffer, when you search for text that is in a fold Selectrum swiper doesn't take care of opening the folds so you can see the text you're at. You can call the following function at the end of selectrum swiper.

(defun org:show-subtree-headlines ()
  "Show headlines surrounding point."
  (save-excursion
    (let ((points nil) (count 0))
      (unless (org-at-heading-p) (org-back-to-heading t))
      (push (point) points)
      (while (org-up-heading-safe)
        (push (point) points))
      (dolist (point points)
        (goto-char point)
        (when (org:heading-folded-p)
          (outline-toggle-children))))))

(defun selectrum:reveal-if-in-org-folds (orig-fn &rest args)
  (prog1 (apply orig-fn args)
    (when (eq major-mode 'org-mode)
      (org:show-subtree-headlines))))

(advice-add #'selectrum-swiper :around #'selectrum:reveal-if-in-org-folds)

Org Capture Template

This code is based on counsel-org-capture. It allows you to use selectrum to select an org capture template.

(defun selectrum/select-capture-template ()
  "Select capture template."
  (interactive)
  (let (prefixes)
    (alet (mapcan (lambda (x)
                    (let ((x-keys (car x)))
                      ;; Remove prefixed keys until we get one that matches the current item.
                      (while (and prefixes
                                  (let ((p1-keys (caar prefixes)))
                                    (or
                                     (<= (length x-keys) (length p1-keys))
                                     (not (string-prefix-p p1-keys x-keys)))))
                        (pop prefixes))
                      (if (> (length x) 2)
                          (let ((desc (mapconcat #'cadr (reverse (cons x prefixes)) " | ")))
                            (list (format "%-5s %s" x-keys desc)))
                        (push x prefixes)
                        nil)))
                  (-> org-capture-templates
                      (org-capture-upgrade-templates)
                      (org-contextualize-keys org-capture-templates-contexts)))
      (funcall #'org-capture nil (car (split-string (completing-read "Capture template: " it nil t)))) )))

Registers

Select a register, then perform the appropriate action (inserting text, jumping to a position, or activating a window or frame configuration).

Register contents and types are searchable. Therefore, to only browse registers containing basic text, search for registers matching "Text: ". For numbers, search "Number: ".

(require 'kmacro)
(require 'frameset)
(require 'register)


;;;###autoload
(defun selectrum-registers ()
  "Use a register, such as jumping to a buffer location or inserting text.

Each kind of register is prefixed with it's type, so that types are also
searchable.  Displayed type names are:

- \"File\": file names
- \"Frame configuration\": configurations of framesets
- \"Keyboard macro\": keyboard macros
- \"Position\": buffer makers and files queries (positions in closed files)
- \"Number\": numbers
- \"Rectangle\": rectangles of text

Basic text, rectangle of text, and numbers are inserted into the
current buffer at point.  Positions are moved to.  Frame and
window configurations are applied."

  (interactive)
  (let* ((selectrum-should-sort-p nil)
         (formatted-registers
          ;; Want to combine formatting and action function, so that we only
          ;; have to check the type of the register contents once.
          ;; Therefore, we create a list of lists, each inner list being of the
          ;; form ("Text form of candidate" #'action-function key-event).
          ;; Next, the text form is propertized.
          (mapcar
           (lambda (reg)
             (append (let ((val (cdr reg)))
                       ;; Many of these description strings are copied from
                       ;; their respective Emacs library.
                       (pcase val
                         ;; File Names
                         (`(file . ,file-name)
                          (list (concat "File: " file-name)
                                #'jump-to-register))

                         ;; File Queries
                         ;; Registered markers of file buffers are turned
                         ;; into file queries after their respective
                         ;; buffer is closed.
                         (`(file-query ,file-name ,position)
                          (list (concat "Position: " file-name
                                        " at " (number-to-string position))
                                #'jump-to-register))

                         ;; Frame Configurations or Frame Set
                         ((pred frameset-register-p)
                          (list
                           (let* ((fs (frameset-register-frameset val))
	                          (ns (length (frameset-states fs))))
                             (format
                              "Frame configuration: %d frame%s, saved on %s."
		              ns
		              (if (= 1 ns) "" "s")
		              (format-time-string "%c"
                                                  (frameset-timestamp fs))))
                           #'jump-to-register))

                         ;; Keyboard Macros
                         ((pred kmacro-register-p)
                          (list
                           (concat
                            "Keyboard macro: "
                            (condition-case nil
                                (format-kbd-macro
                                 (kmacro-register-macro val)
                                 1)
                              ;; Recover from error from
                              ;; `edmacro-fix-menu-commands'.  In Emacs
                              ;; 27, it looks like mouse events are
                              ;; silently skipped over.
                              (error "Warning: Cannot display macros containing mouse clicks")))
                           #'jump-to-register))

                         ;; Markers
                         ((pred markerp)
                          (list
                           (concat "Position: "
                                   (if-let ((buf (marker-buffer val)))
                                       (concat
                                        (buffer-name buf)
                                        " at "
                                        (number-to-string
                                         (marker-position val)))
                                     "Buffer no longer exists."))
                           #'jump-to-register))

                         ;; Numbers
                         ((pred numberp)
                          (list (concat "Number: " (number-to-string val))
                                #'insert-register))

                         ;; Rectangles
                         ((and `(,elem1 . ,_)
                               (guard (stringp elem1)))
                          (list (concat "Rectangle: " (string-join val "\n"))
                                #'insert-register))

                         ;; Strings
                         ((pred stringp)
                          (list (concat "Text: " val)
                                #'insert-register))

                         ;; Window Configurations
                         ((and `(,window-config ,_)
                               (guard (window-configuration-p window-config)))
                          (list
                           (let* ((stored-window-config window-config)
                                  (window-config-frame
                                   (window-configuration-frame stored-window-config))
                                  (current-frame (selected-frame)))
                             ;; These mostly copied from register.el.
                             (format
                              "Window configuration: %s."
                              (if (frame-live-p window-config-frame)
                                  (with-selected-frame window-config-frame
                                    (save-window-excursion
                                      (set-window-configuration stored-window-config)
                                      (concat
                                       (mapconcat
                                        (lambda (w)
                                          (buffer-name (window-buffer w)))
                                        (window-list (selected-frame)) ", ")
                                       (unless (eq current-frame
                                                   window-config-frame)
                                         " in another frame"))))
                                "dead frame")))
                           #'jump-to-register))

                         ;; For anything else, just mark it as garbage.
                         (_ '(garbage))))
                     ;; The register key.
                     (list (car reg))))
           ;; Destructively sort a copy of the alist by ordering the keys.
           (sort (copy-sequence register-alist) #'car-less-than-car)))
         ;; Remove anything marked as garbage.
         (filtered-choices (seq-remove (lambda (choice)
                                         (eq (car choice) 'garbage))
                                       formatted-registers))

         ;; Create candidates as a list of strings.
         (actual-candidates (mapcar (lambda (choice)
                                      (propertize
                                       (car choice)
                                       'selectrum-candidate-display-prefix
                                       (concat
                                        (single-key-description (caddr choice))
                                        ": ")))
                                    filtered-choices))

         ;; Use the selected string to match the desired register.
         (chosen-register (assoc (completing-read "Select register: "
                                                  actual-candidates
                                                  nil t)
                                 filtered-choices)))

    ;; Apply the correct action function to the register key.
    (funcall (cadr chosen-register) (caddr chosen-register))))

Switching buffers / files

Toggle to project file search

(defvar selectrum--toggle-project-data+ nil)

(push (cons "C-," 'selectrum-toggle-project-file-scope+)
      selectrum-minibuffer-bindings)

(defun selectrum-toggle-project-file-scope+ ()
  "Toggle to project scope when reading file names.
Depends on `projectile'."
  (interactive)
  (unless minibuffer-completing-file-name
    (user-error "Not reading file names"))
  (require 'projectile)
  (setq selectrum--previous-input-string nil)
  (cond ((and selectrum--toggle-project-data+
              (string-match "in project: \\'"
                            (buffer-substring
                             (point-min) (minibuffer-prompt-end))))
         (let ((inhibit-read-only t))
           (save-excursion
             (goto-char (minibuffer-prompt-end))
             (search-backward " in project")
             (delete-region (match-beginning 0)
                            (match-end 0)))
           (delete-minibuffer-contents))
         (insert (car selectrum--toggle-project-data+))
         (setq selectrum--preprocessed-candidates
               (cdr selectrum--toggle-project-data+))
         (setq selectrum--toggle-project-data+ nil))
        (t
         (if-let ((input (selectrum-get-current-input))
                  (project (projectile-project-root
                            (file-name-directory input))))
             (let* ((inhibit-read-only t)
                    (ematch (file-name-nondirectory input))
                    (cands
                     (mapcar
                      (lambda (i)
                        (add-text-properties
                         0 (length i)
                         `(selectrum-candidate-full
                           ,(concat project i))
                         i)
                        i)
                      (projectile-project-files project))))
               (save-excursion
                 (goto-char (minibuffer-prompt-end))
                 (search-backward ":")
                 (insert
                  (apply #'propertize
                         " in project"
                         (text-properties-at (point)))))
               (setq selectrum--toggle-project-data+
                     (cons
                      input
                      selectrum--preprocessed-candidates))
               (delete-minibuffer-contents)
               (insert
                (concat (abbreviate-file-name project) ematch))
               (setq selectrum--preprocessed-candidates
                     (lambda (input)
                       (let ((ematch (file-name-nondirectory input)))
                         `((input . ,ematch)
                           (candidates . ,cands))))))
           (user-error "Not in project")))))

Switch to recent file

Simple function to list recent files using Selectrum. I bind to C-x C-r.

(defun recentf-open-files+ ()
  "Use `completing-read' to open a recent file."
  (interactive)
  (let ((files (mapcar 'abbreviate-file-name recentf-list)))
    (find-file (completing-read "Find recent file: " files nil t))))

Including files listed in the XDG specification (used on Linux).

Below is an example of including files recently used by Linux desktop environments, such as GNOME, KDE, MATE, Xfce, etc. This command uses functions introduced in Emacs 26. It can be finicky to evaluate and compile.

This is based on the same feature found in Counsel.

(eval-and-compile
  (require 'dom)
  (require 'xdg))

(declare-function dom-attr "dom")
(declare-function dom-by-tag "dom")
(defvar recentf-list)

(defun selectrum--recentf-get-xdg ()
  (let ((file-of-recent-files
         (expand-file-name "recently-used.xbel" (xdg-data-home))))
    (if (not (file-readable-p file-of-recent-files))
        (user-error "List of XDG recent files not found.")
      (delq
       nil
       (mapcar
        (lambda (bookmark-node)
          (let ((local-path
                 (string-remove-prefix "file://"
                                       (dom-attr bookmark-node
                                                 'href))))
            (when local-path
              (let ((full-file-name
                     (decode-coding-string
                      (url-unhex-string local-path)
                      'utf-8)))
                (when (file-exists-p full-file-name)
                  full-file-name)))))
        (nreverse (dom-by-tag (with-temp-buffer
                                (insert-file-contents file-of-recent-files)
                                (libxml-parse-xml-region (point-min)
                                                         (point-max)))
                              'bookmark)))))))

(defun selectrum-recentf ()
  "Open a recently used file (including XDG)."
  (interactive)
  (let* ((selectrum-should-sort-p nil)
         (all-recent-files
          (append (mapcar #'substring-no-properties
                          recentf-list)
                  (seq-filter #'recentf-include-p
                              (selectrum--recentf-get-xdg))))
         (files-with-times
          (mapcar (lambda (file)
                    (cons file
                          ;; Use modification time, since getting file access time
                          ;; seems to count as accessing the file, ruining future uses.
                          (file-attribute-modification-time (file-attributes file))))
                  all-recent-files))
         (sorted-files
          (delete-dups (sort files-with-times
                             (lambda (file1 file2)
                               ;; Want existing most recent local files first.
                               (cond ((or (not (file-exists-p (car file1)))
                                          (file-remote-p (car file1)))
                                      nil)
                                     ((or (not (file-exists-p (car file2)))
                                          (file-remote-p (car file2)))
                                      t)
                                     (t (time-less-p (cdr file2)
                                                     (cdr file1))))))))
         (propertized-files (mapcar (lambda (f)
                                      (propertize (abbreviate-file-name (car f))
                                                  'selectrum-candidate-display-right-margin
                                                  (propertize (current-time-string (cdr f))
                                                              'face 'completions-annotations)))
                                    sorted-files)))
    (find-file (completing-read "Select recent file: " propertized-files
                                nil t nil 'file-name-history
                                (car propertized-files)))))

Switch to buffer or recent file

Switch to open buffer or recent file. Narrow to hidden buffer with " " prefix, to files with "f " prefix and to buffers with "b " prefix. (See https://github.com/raxod502/selectrum/issues/9#issuecomment-631325725)

;; -*- lexical-binding: t -*-

(defun selectrum-switch-buffer+ ()
  (interactive)
  (let* ((selectrum-should-sort-p nil)
         (candidates
          (let* ((cb (window-buffer
                      (minibuffer-selected-window)))
                 (bf (or (buffer-file-name cb) "")))
            (lambda (input)
              (let* ((buffers (mapcar #'buffer-name
                                      (cl-delete-if
                                       (lambda (buf)
                                         (eq buf cb))
                                       (buffer-list))))
                     (files (cl-delete-if (lambda (f) (string= f bf))
                                          (copy-sequence recentf-list)))
                     (candidates ()))
                (cond ((string-prefix-p " " input)
                       (setq input (substring input 1))
                       (setq candidates
                             (cl-delete-if-not
                              (lambda (name)
                                (string-prefix-p " " name))
                              buffers)))
                      ((string-prefix-p "b " input)
                       (setq input (substring input 2))
                       (setq candidates
                             (cl-delete-if
                              (lambda (name)
                                (string-prefix-p " " name))
                              buffers)))
                      ((string-prefix-p "f " input)
                       (setq input (substring input 2))
                       (setq candidates files))
                      (t
                       (setq candidates
                             (append
                              (cl-delete-if
                               (lambda (name)
                                 (string-prefix-p " " name))
                               buffers)
                              files))))
                `((candidates . ,candidates)
                  (input . ,input))))))
         (cand (selectrum-read "Switch to: " candidates)))
    (cond ((member cand recentf-list)
           (find-file cand))
          (t
           (switch-to-buffer cand)))))

Info

Jumping to an Info Node

The command selectrum-info has you select a top-level node, like "emacs" or "elisp", and then select a sub-level node. You can also just pass in a top-level node as an argument, like in the example commands selectrum-info-emacs-manual or selectrum-info-elisp-manual. This is based on the work of the user Luis-Henriquez-Perez, who wrote a similar feature for Counsel.

(defvar Info-directory-list)
(defvar Info-additional-directory-list)
(defvar Info-default-directory-list)
(declare-function info-initialize "info")
(declare-function cl-mapcar "cl-lib")

(defvar selectrum-info-history nil
  "Completion history for `selectrum-info' and derived commands.")

(defcustom selectrum-info-default-other-window t
  "Whether `selectrum-info' (and derived commands) should display
the Info buffer in the other window by default. Use a prefix argument to
do the opposite."
  :type 'boolean
  :group 'selectrum)

(defun selectrum--info-get-child-node (top-node)
  "Create and select from a list of Info nodes found in the parent node TOP-NODE."
  (let (;; It's reasonable to assume that sections are intentionally
        ;; ordered in a certain way, so we preserve that order.
        (selectrum-should-sort-p nil)
        ;; Headers look like "* Some Thing::      Description",
        ;; where descriptions are optional and might continue on
        ;; the next line.
        (sub-topic-format (rx "* "
                              (group (+? (not ?:)))
                              "::"
                              ;; Include the description, if one exists.
                              ;; If it doesn't, the line ends immediately.
                              (or "\n"
                                  (seq
                                   (0+ blank)
                                   (group (+? anychar))
                                   ;; Sometimes a heading follows on the next line,
                                   ;; and sometimes there's any empty blank line
                                   ;; (such as before a section title).  For now,
                                   ;; assume continuation lines use indentation and
                                   ;; other lines don't.
                                   ;; (or "\n\n" "\n*")
                                   "\n" (not blank))))))
    (save-match-data
      (save-selected-window
        (completing-read
         "Info Sub-Topic: "
         (with-temp-buffer
           ;; Some nodes created from multiple files.
           (info top-node (current-buffer))
           (goto-char (point-min))
           (cl-loop while (re-search-forward sub-topic-format nil t)
                 do (forward-line 0)         ; Go back to start of line.
                 collect (match-string 1) into node-names
                 collect (match-string 2) into descriptions
                 ;; If a node has a description, it helps if that description is
                 ;; also searchable.  For the normal `*Completions*' buffer, that
                 ;; can be done using regular annotation data.  For Selectrum,
                 ;; (in which annotations can't currently be matched against),
                 ;; this can be done by including the annotation in the
                 ;; displayed text and setting the `selectrum-candidate-full'
                 ;; property to be the actual node name.
                 finally return
                 (if selectrum-mode
                     (cl-mapcar (lambda (node-name description)
                                  (propertize
                                   (concat
                                    node-name
                                    (when description
                                      (propertize
                                       (concat " - "
                                               (replace-regexp-in-string
                                                "\n" ""
                                                (replace-regexp-in-string
                                                 " +" " " description)))
                                       'face 'completions-annotations)))
                                   'selectrum-candidate-full
                                   node-name))
                                node-names descriptions)
                   (let ((name-desc-pairs
                          (cl-mapcar (lambda (node-name description)
                                       (cons node-name
                                             (when description
                                               (concat
                                                " - "
                                                (replace-regexp-in-string
                                                 "\n" ""
                                                 (replace-regexp-in-string
                                                  " +" " " description))))))
                                     node-names descriptions)))
                     (lambda (input predicate action)
                       (if (eq action 'metadata)
                           `(metadata
                             (annotation-function
                              . ,(lambda (cand)
                                   (cdr (assoc cand name-desc-pairs))))
                             (display-sort-function . identity)
                             (cycle-sort-function . identity))
                         (complete-with-action action
                                               name-desc-pairs
                                               input
                                               predicate)))))))
         nil t nil 'selectrum-info-history)))))

;;;###autoload
(defun selectrum-info (other-window-opposite-p &optional top-node)
  "Go to a node of an Info topic.
With a prefix argument, do the opposite
of `selectrum-info-default-other-window'.
For example, you can go to \"(magit)Notes\" by selecting \"magit\", then \"Notes\" ."
  (interactive "P")

  ;; Initialize Info information so that the proper directories
  ;; can be found.
  (info-initialize)

  (save-match-data
    (let* ((use-other-window (if other-window-opposite-p
                                 (not selectrum-info-default-other-window)
                               selectrum-info-default-other-window))
           ;; Get all Info files.
           (node-files
            (cl-loop for directory in (append (or Info-directory-list
                                                  Info-default-directory-list)
                                              Info-additional-directory-list)
                  ;; If the directory exists
                  when (file-directory-p directory)
                  ;; get all files with ".info" in their name.
                  append (directory-files directory nil "\\.info" t)))

           ;; Get the names of the Info nodes, based on the file names.
           (node-names (cl-remove-duplicates
                        (cl-loop for file in node-files
                              do (string-match "\\(.+?\\)\\." file)
                              collect (match-string 1 file))
                        :test #'equal))

           ;; Select a top node/topic.
           (chosen-top-node (cond
                              ((null top-node)
                               (completing-read "Info Topic: " node-names nil t))
                              ((member top-node node-names)
                               top-node)
                              (t (error "Top-level Info node does not exist: %s"
                                        top-node))))

           ;; Select a child node.
           (chosen-child-node (selectrum--info-get-child-node chosen-top-node)))

      ;; Go to the chosen child node.
      (funcall (if use-other-window
                   #'info-other-window
                 #'info)
               (format "(%s)%s" chosen-top-node chosen-child-node)))))

;;;###autoload
(defun selectrum-info-elisp-manual (other-window-opposite-p)
  "Like `selectrum-info', but directly choose nodes from the Emacs Lisp (Elisp) manual."
  (interactive "P")
  (selectrum-info other-window-opposite-p "elisp"))

;;;###autoload
(defun selectrum-info-emacs-manual (other-window-opposite-p)
  "Like `selectrum-info', but directly choose nodes from the Emacs manual."
  (interactive "P")
  (selectrum-info other-window-opposite-p "emacs"))

;;;###autoload
(defun selectrum-info-org-manual (other-window-opposite-p)
  "Like `selectrum-info', but directly choose nodes from the Org manual."
  (interactive "P")
  (selectrum-info other-window-opposite-p "org"))

Misc (by lorniu)

Use this helper macro to add action support.

(cl-defmacro selectrum-make-action ((&rest args) &body body)
  (declare (indent 1))
  `(lambda ()
     (interactive)
     (put 'quit 'error-message "")
     (run-at-time nil nil
                  (lambda (,@args)
                    (put 'quit 'error-message "Quit")
                    (with-demoted-errors "Error: %S"
                      ,@body))
                  ,@(seq-take
                     `((if selectrum--refined-candidates (nth selectrum--current-candidate-index selectrum--refined-candidates))
                       selectrum--refined-candidates
                       (selectrum-get-current-input)
                       selectrum--current-candidate-index)
                     (length args)))
     (abort-recursive-edit)))

Search with ripgrep, like `counsel-rg'

(defvar selectrum-search-rg-history nil)

(defun im/search-rg+ ()
  "Search like 'counsel-rg'.

Default, search for current directory, if the input begin with 'p ' then
will search current project, if begin with 'o ' then will search org-directory.

'C-c C-o' to pop the rg.el's Occur view, make sure package `rg' is installed."
  (interactive)
  (unless (executable-find "rg")
    (user-error "ripgrep must be installed."))
  (let* (type
         input
         (dir default-directory)
         (word (if (use-region-p)
                   (buffer-substring-no-properties (region-beginning) (region-end))
                 (let* ((sym (symbol-at-point)) (symn (symbol-name sym)))
                   (if (and sym (> 50 (length symn) 3)) symn nil))))
         (command (if (memq system-type '(ms-dos windows-nt))
                      "rg -M 240 --with-filename --no-heading --line-number --color never -S -e <R> ."
                    "rg -M 240 --with-filename --no-heading --line-number --color never -S -e <R>"))
         (cands (lambda (in)
                  (let ((msg)
                        (prop (lambda (cs)
                                (mapcar (lambda (c)
                                          (when (string-match "\\`\\([^:]+\\):\\([^:]+\\):" c)
                                            (add-face-text-property (match-beginning 1) (match-end 1) 'compilation-info nil c)
                                            (add-face-text-property (match-beginning 2) (match-end 2) '(:underline t :inherit compilation-line-number) nil c))
                                          c)
                                        cs))))
                    (cond
                      ;; search current project
                      ((string-prefix-p "p " in)
                       (cond ((not (project-current))
                              (setq msg "This is not in a project."))
                             ((< (length in) 5)
                              (setq msg "Search in current project, input should more than 3."))
                             (t
                              (setq type 'project)
                              (setq dir (cdr (project-current)))
                              (setq in (cl-subseq in 2)))))
                      ;; search org-directory
                      ((string-prefix-p "o " in)
                       (cond ((not (file-exists-p org-directory))
                              (setq msg "Org Directory not exist?"))
                             ((< (length in) 5)
                              (setq msg "Search in org-directory, input should more than 3."))
                             (t
                              (setq type 'org)
                              (setq dir org-directory)
                              (setq in (cl-subseq in 2)))))
                      ;; search current directory
                      (t (if (< (length in) 3)
                             (setq msg "Input should more than 3."))
                         (setq type nil)
                         (setq dir default-directory)))
                    ;; take space in INPUT as .*?
                    ;; take m-space as [[:blank:]]
                    (setq input
                          (replace-regexp-in-string
                           " +" "[[:blank:]]"
                           (replace-regexp-in-string
                            "\\([^ ]\\) \\([^ ]\\)" "\\1.+?\\2"
                            (string-trim in))))
                    (if msg
                        (prog1 nil
                          (setq-local selectrum-refine-candidates-function
                                      (lambda (_ __) (list msg))))
                      (kill-local-variable 'selectrum-refine-candidates-function)
                      (let* ((default-directory dir)
                             (cs (split-string
                                  (shell-command-to-string (grep-expand-template command input)) "\n")))
                        `((candidates . ,(funcall prop cs))
                          (input . ,input)))))))
         (cand (let ((selectrum-should-sort-p nil)
                     (selectrum-minibuffer-bindings
                      (append
                       selectrum-minibuffer-bindings
                       `(("C-c C-o" . ,(selectrum-make-action (c)
                                         ;; use rg.el to show the results in Occur buffer
                                         (require 'rg)
                                         (require 'compile)
                                         ;; jump to current candidate in the *rg* buffer.
                                         ;; rg implemented with `compile', so I make it work like below.
                                         ;; let-bound method not working, unkown reason.
                                         (let ((old-compilation-finish-functions compilation-finish-functions))
                                           (setq compilation-finish-functions
                                                 (list
                                                  (lambda (_a _b)
                                                    (unwind-protect
                                                         (progn
                                                           (pop-to-buffer (current-buffer))
                                                           (when (string-match "\\`\\(.*?\\):\\([0-9]+\\):\\(.*\\)\\'" c)
                                                             (let ((file-name (match-string-no-properties 1 c))
                                                                   (line-number (match-string-no-properties 2 c)))
                                                               (if rg-group-result
                                                                   (progn
                                                                     (re-search-forward (format "^File: %s" file-name) nil t)
                                                                     (re-search-forward (format "^ *%s" line-number) nil t)
                                                                     (re-search-forward input (point-at-eol) t))
                                                                 (re-search-forward (format "%s:%s:" file-name line-number) nil t)
                                                                 (re-search-forward input (point-at-eol) t)))))
                                                      (setq compilation-finish-functions old-compilation-finish-functions)))))
                                           ;; dispatch to rg.el search.
                                           (cond ((eq type 'project) (rg-project input "*"))
                                                 (t                  (rg input "*" dir))))))))))
                 (selectrum-read "rg: " cands
                                 :initial-input word
                                 :may-modify-candidates t
                                 :history 'selectrum-search-rg-history
                                 :require-match t))))
    (if (string-match "\\`\\(.*?\\):\\([0-9]+\\):\\(.*\\)\\'" cand)
        (let ((file-name (match-string-no-properties 1 cand))
              (line-number (match-string-no-properties 2 cand)))
          (xref-push-marker-stack) ; use M-, to go back!
          (find-file (expand-file-name file-name dir))
          (goto-char (point-min))
          (forward-line (1- (string-to-number line-number)))
          (re-search-forward input (point-at-eol) t)
          (recenter))
      (message "Bad candidate?"))))

Jump to Imenu item

(defvar selectrum-imenu+ nil)

(defun im/imenu+ ()
  "Choose from `imenu' just like `counsel-imenu'."
  (interactive)
  (require 'imenu)
  (let* ((selectrum-should-sort-p nil)
         (candidates (let* ((imenu-auto-rescan t)
                            (items (imenu--make-index-alist t)))
                       ;; remove *Rescan*
                       (setq items (delete (assoc "*Rescan*" items) items))
                       ;; special mode
                       (when (eq major-mode 'emacs-lisp-mode)
                         (let ((fns (cl-remove-if #'listp items :key #'cdr)))
                           (if fns (setq items (nconc (cl-remove-if #'nlistp items :key #'cdr) `(("Functions" ,@fns)))))))
                       ;; refine
                       (cl-labels ((get-candidates (alist &optional prefix)
                                     (cl-mapcan
                                      (lambda (elm)
                                        (if (imenu--subalist-p elm)
                                            (get-candidates
                                             (cl-loop for (e . v) in (cdr elm)
                                                   collect (cons e (if (integerp v) (copy-marker v) v)))
                                             (concat prefix (if prefix ".") (car elm)))
                                          (let ((key (concat (if prefix (concat (propertize prefix 'face 'font-lock-keyword-face) ": "))
                                                             (car elm))))
                                            (list (cons key (cons key (if (overlayp (cdr elm)) (overlay-start (cdr elm)) (cdr elm))))))))
                                      alist)))
                         (setq items (get-candidates items)))
                       ;; sort
                       (cl-sort items #'string< :key #'car)))
         (cand (completing-read "Imenu: " (mapcar #'car candidates) nil t nil selectrum-imenu+)))
    (imenu (cdr (cl-find cand candidates :test #'string= :key #'car)))))

Jump to Page Separater position

(defvar selectrum-pages+ nil)

(defun im/pages+ ()
  "Fast jump to position just like package `counsel-page'."
  (interactive)
  (let* ((selectrum-should-sort-p nil)
         (cands (let ((lst)
                      (delim "^\014")
                      (current-line (lambda ()
                                      (skip-chars-forward " \t\n")
                                      (let ((str (buffer-substring (point) (line-end-position)))
                                            (value (number-to-string (point))))
                                         (add-text-properties 0 (length str) (list 'selectrum-candidate-full value) str)
                                         str))))
                  (save-excursion
                    (goto-char (point-min))
                    (save-restriction
	                  (if (and (save-excursion (re-search-forward delim nil t))
		                       (= 1 (match-beginning 0)))
	                      (goto-char (match-end 0)))
	                  (push (funcall current-line) lst)
	                  (while (re-search-forward delim nil t)
	                    (push (funcall current-line) lst))))
                  (nreverse lst)))
         (cand (completing-read "Pages: " cands nil t nil selectrum-pages+)))
    (goto-char (string-to-number cand))
    (recenter-top-bottom 1)))

Toggle between different window layouts

(defvar selectrum-views nil)

(defun im/views+ ()
  "Toggle the window layout with this single command.

You will see the candidates after invoke this command.

Select a candidate can:
- Add the current window configuration to the candidates
- Update the current window configuration
- Toggle to the choosen window layout.

'C-d' to delete current candidate, and 'C-S-d' to delete all.
"
  (interactive)
  (cl-labels ((view-exist-p (name)
                (assoc name selectrum-views))
              (view-config ()
                "Get the window configuration (layout)"
                (dolist (w (window-list))
                  (set-window-parameter
                   w 'view-data
                   (with-current-buffer (window-buffer w)
                     (cond (buffer-file-name
                            (list 'file buffer-file-name (point)))
                           ((eq major-mode 'dired-mode)
                            (list 'file default-directory (point)))
                           (t (list 'buffer (buffer-name) (point)))))))
                (let ((window-persistent-parameters
                       (append window-persistent-parameters (list (cons 'view-data t)))))
                  (current-window-configuration)))
              (restore-view (view)
                "Restore the window configuration (layout)."
                (cond ((window-configuration-p view) ; window
                       (set-window-configuration view)
                       (dolist (w (window-list))
                         (with-selected-window w
                           (restore-view (window-parameter w 'view-data)))))
                      ((eq (car view) 'file) ; file
                       (let* ((name (nth 1 view)) buffer)
                         (cond ((setq buffer (get-buffer name))
                                (switch-to-buffer buffer nil 'force-same-window))
                               ((file-exists-p name)
                                (find-file name))))
                       (goto-char (nth 2 view)))
                      ((eq (car view) 'buffer) ; buffer
                       (switch-to-buffer (nth 1 view))
                       (goto-char (nth 2 view))))))
    (let* ((selectrum-minibuffer-bindings (append
                                           selectrum-minibuffer-bindings
                                           `(("C-d" . ,(selectrum-make-action (c)
                                                         (when (y-or-n-p (format "Delete this item `%s' ? " c))
                                                           (setq selectrum-views
                                                                 (cl-remove c selectrum-views :test 'string-equal :key 'car)))
                                                         (im/views+)))
                                             ("C-S-d" . ,(selectrum-make-action ()
                                                           (if (y-or-n-p (format "Clear *ALL* views? "))
                                                               (progn (setq selectrum-views nil)
                                                                      (message "Clear Done!"))
                                                             (message "Nothing Done.")))))))
           (face 'font-lock-builtin-face)
           (selectrum-should-sort-p nil)
           (current (concat "{} " (mapconcat #'identity
                                             (sort
                                              (mapcar (lambda (w)
                                                        (let* ((b (window-buffer w)) (f (buffer-file-name b)))
                                                          (if f (file-name-nondirectory f) (buffer-name b))))
                                                      (window-list))
                                              #'string-lessp)
                                             " ")))
           (views (if (view-exist-p current)
                      (mapcar (lambda (view)
                                (if (string-equal (car view) current)
                                    (propertize (car view) 'face face)
                                  (car view)))
                              selectrum-views)
                    (cons (propertize current 'face `(:underline t :inherit ,face)) (mapcar #'car selectrum-views))))
           (view (completing-read "Views: " views nil nil nil nil current)))
      (cond
        ;; check
        ((not (string-match-p "^{} " (or view "")))
         (message "Error view-name detected."))
        ;; update/add
        ((or (string-equal current view)
             (not (view-exist-p view)))
         (let ((x (assoc view selectrum-views))
               (config (view-config)))
           (if x (setcdr x (list config))
             (push (list (substring-no-properties view) config) selectrum-views))))
        ;; switch
        ((view-exist-p view)
         (let ((inhibit-message t))
           (delete-other-windows)
           (restore-view (cadr (assoc view selectrum-views)))))))))
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