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mvtn-backlink-buffer.el
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mvtn-backlink-buffer.el
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;;; mvtn-backlink-buffer.el --- Display backlinks in a side buffer -*- lexical-binding: t -*-
;;; Commentary:
;; Provides the function `mvtn-backlink-buffer-toggle-side-window' which toggles
;; the visibility of a buffer containing backlinks to the currently open mvtn
;; note.
;;; Code:
(require 'mvtn)
(require 'mvtn-link-buttons)
(require 'mvtn-file-helpers)
(require 'org)
(defcustom mvtn-search-async-command
(if (eq mvtn-search-function 'mvtn-search-full-text-rg) 'rg 'grep)
"The command-line program used to populate the backlink buffer.
Can be one of '(grep rg)."
:type 'symbol :group 'mvtn)
(defcustom mvtn-backlink-buffer-heading-face '(:inherit font-lock-string-face)
"How headings should be displayed in the backlink buffer.
Headings refer to the actual backlinks here."
:type 'list :group 'mvtn)
(defcustom mvtn-backlink-buffer-display-settings
'(display-buffer-in-side-window . ((side . right) (window-width . 0.2)))
"How the backlink window should be displayed.
This will be passed to `display-buffer' as ACTION. See
`display-buffer' and Info node `(elisp) Buffer Display Action
Alists' for available options."
:type 'sexp :group 'mvtn)
(defcustom mvtn-backlink-buffer-mode-line-format " *mvtn-backlinks*"
"The format of the backlink buffers mode-line.
See `mode-line-format' for further details."
:type 'string :group 'mvtn)
(defvar mvtn-backlink-buffer--log-updates nil
"Log updates of the backlink buffer to the *Messages* buffer.")
(defvar mvtn-backlink-buffer--title ""
"The title of the current backlink buffer.")
(defconst mvtn-search-async-buffer "*mvtn-search-async-output*"
"The name of the process buffer populating the backlink buffer.")
(defconst mvtn-backlink-buffer "*mvtn-backlinks*"
"The name of the backlink buffer.")
(defun mvtn-backlink-buffer-parse-command-output (command-output)
"Parse a COMMAND-OUTPUT from `mvtn-search-full-text-grep-async-command'.
The result is a list of property lists, each with the keys :file,
:line and :text."
(save-match-data
(let ((text-tmp "") (result nil))
(dolist (line (butlast (split-string command-output "\n")))
(cond
;; lines with context ("-B" flag)
((string-match (format "\\(.+\\)%s\\([0-9]+\\)-\\(.+\\)"
(byte-to-string 0))
line)
(setq text-tmp (concat text-tmp
(match-string-no-properties 3 line) "\n ")))
;; lines matching search query
((string-match (format "\\(.+\\)%s\\([0-9]+\\):\\(.+\\)"
(byte-to-string 0))
line)
(push (list :file (match-string-no-properties 1 line)
:line (match-string-no-properties 2 line)
:text (concat text-tmp
(match-string-no-properties 3 line)))
result)
(setq text-tmp ""))))
result)))
(defun mvtn-backlink-buffer-sentinel (process signal)
"Runs after the command from `mvtn-backlink-buffer-populate' has exited.
When the command was successful, it will populate the backlink
buffer. PROCESS will be the process created in
`mvtn-backlink-buffer-populate' and SIGNAL the signal the process
is emitting."
(ignore signal)
;; (print (format "signal: %s" (process-exit-status process)))
;; (print (format "status: %s" (process-status process)))
(when mvtn-backlink-buffer--log-updates
(message "Updating the backlink buffer"))
(when (memq (process-status process) '(exit))
(let ((code (process-exit-status process)))
(when (not (or (eq code 0) (eq code 1)))
(error "Process failed with unexpected exit-code %s" code)))
(let* ((result (with-current-buffer (process-buffer process)
(buffer-substring-no-properties (point-min) (point-max))))
(parsed (mvtn-backlink-buffer-parse-command-output result)))
(kill-buffer (process-buffer process))
(with-current-buffer (get-buffer-create mvtn-backlink-buffer)
(mvtn-backlink-buffer-mode)
(read-only-mode 0)
(erase-buffer)
(insert (format "*%s*\n" mvtn-backlink-buffer--title))
(insert "==============================\n\n")
(cond ((= (length parsed) 0) (insert "No Backlinks found."))
((= (length parsed) 1) (insert (format "%d Backlink:\n\n"
(length parsed))))
((> (length parsed) 1) (insert (format "%d Backlinks:\n\n"
(length parsed)))))
(dolist (el parsed)
(let* ((id+name (mvtn--extract-note-identity (plist-get el :file) t))
(name (substring id+name 16))
(link (format "^^%s :l: %s^^" id+name (plist-get el :line))))
(insert "- ")
(insert-button (format "%s" name)
'button t
'help-echo (format "Follow link: %s" link)
'mvtn-link link
'action (lambda (b) (mvtn-follow-link (button-get b 'mvtn-link))
(mvtn-backlink-buffer-populate))
'keymap '(keymap
(mouse-1 . push-button)
(13 . push-button)) ;; RET
))
(insert (format "\n %s\n\n" (plist-get el :text))))
(read-only-mode 1)))))
(defun mvtn-search-full-text-grep-async-command (string)
"Return a grep command for a full text search in all notes.
Searches for the regexp STRING."
(let ((default-directory (plist-get (car mvtn-note-directories) :dir)))
(append (list mvtn-grep-program "-nHrIZ" "--before-context=2" string)
(mvtn--search-dirs))))
(defun mvtn-backlink-buffer-populate ()
"Start a process that will populate the backlink buffer."
(when (not (member mvtn-search-async-command '(grep rg)))
(error "Invalid value of `mvtn-search-async-command': %s"
mvtn-search-async-command))
(setq mvtn-backlink-buffer--title (mvtn-current-buffer-title))
(let ((default-directory (plist-get (car mvtn-note-directories) :dir)))
(make-process
:name "mvnt-backlink-search"
:buffer (generate-new-buffer mvtn-search-async-buffer)
:command (funcall (cond ((eq mvtn-search-async-command 'grep)
'mvtn-search-full-text-grep-async-command)
((eq mvtn-search-async-command 'rg)
'mvtn-search-full-text-rg-async-command))
(format "\\^\\^%s" (mvtn--extract-note-identity
(buffer-file-name))))
:noquery t
:sentinel 'mvtn-backlink-buffer-sentinel)))
(define-minor-mode mvtn-backlink-buffer-side-window-mode
"This minor mode will enable automatic updates of the backlink buffer.
Should not be used manually as calling
`mvtn-backlink-buffer-toggle-side-window' is more intuitive."
nil " backlinks" nil
:global t
(let ((hooks (if (> emacs-major-version 26)
'(window-state-change-hook)
'(window-configuration-change-hook post-command-hook))))
(dolist (hook hooks)
(if (bound-and-true-p mvtn-backlink-buffer-side-window-mode)
(add-hook hook 'mvtn-backlink-buffer-maybe-update-side-window)
(remove-hook hook 'mvtn-backlink-buffer-maybe-update-side-window)))))
(defun mvtn-backlink-buffer-maybe-update-side-window ()
"Maybe run `mvtn-backlink-buffer-populate'.
Only runs said function if in `mvtn-minor-mode' and the
`mvtn-backlink-buffer' is visible."
(when (and (bound-and-true-p mvtn-minor-mode)
(get-buffer-window mvtn-backlink-buffer))
(mvtn-backlink-buffer-populate)))
(define-derived-mode mvtn-backlink-buffer-mode org-mode
"Mvtn Backlink Buffer Mode"
"The major mode for `mvtn-backlink-buffer-toggle-side-window'."
(setq-local org-hide-emphasis-markers t)
(org-indent-mode 1)
(visual-line-mode 1)
(setq-local mode-line-format mvtn-backlink-buffer-mode-line-format)
(apply 'face-remap-add-relative
(append '(button) mvtn-backlink-buffer-heading-face))
(mvtn-link-buttons-fontify))
(defun mvtn-backlink-buffer-next-backlink (count)
"Move forward COUNT backlinks in the backlink buffer."
(interactive "p")
(dotimes (_ count) (search-forward-regexp "^- " nil t)))
(defun mvtn-backlink-buffer-previous-backlink (count)
"Move backward COUNT backlinks in the backlink buffer."
(interactive "p")
(condition-case nil
(dotimes (_ count)
(search-backward-regexp
"^- " nil nil (if (string-equal
"- " (buffer-substring-no-properties
(point-at-bol) (+ (point-at-bol) 2)))
2 1))
(forward-char 2))
(error nil)))
(define-key mvtn-backlink-buffer-mode-map (kbd "n")
'mvtn-backlink-buffer-next-backlink)
(define-key mvtn-backlink-buffer-mode-map (kbd "p")
'mvtn-backlink-buffer-previous-backlink)
(define-key mvtn-backlink-buffer-mode-map (kbd "q")
'mvtn-backlink-buffer-toggle-side-window)
;;;###autoload
(defun mvtn-backlink-buffer-toggle-side-window (action)
"Toggle visibility of a side window showing backlinks to the current note.
When called interactively, the visibility is toggled. When
called programmatically, the visibility is defined by
ACTION (either 'show or 'hide). See
`mvtn-backlink-buffer-side-window-side' for customization. Uses
`mvtn-search-async-command' to search for backlinks."
(interactive '(nil))
(let ((win (get-buffer-window mvtn-backlink-buffer)))
(when (or (eq action 'show) (and (eq action nil) (not win)))
(mvtn-backlink-buffer-side-window-mode 1)
(display-buffer (get-buffer-create mvtn-backlink-buffer)
mvtn-backlink-buffer-display-settings))
(when (and win (or (eq action 'hide) (eq action nil)))
(delete-window win))))
(provide 'mvtn-backlink-buffer)
;;; mvtn-backlink-buffer.el ends here