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;; -*- lexical-binding: t; -*-
(defvar hmm-web-search-engines nil "hmm web search engines.")
(defvar hmm-web-browsers nil "hmm web browers.")
(defvar hmm-handlers '(:query nil :url nil :file nil))
(defmacro hmm-define-web-search-engine (engine browser)
(let* ((engine-name (plist-get engine :name))
(browser-name (plist-get browser :name))
(function-name (intern
(format "hmm-search-%s-%s" engine-name browser-name))))
`(progn
(defun ,function-name (query)
,(format "Search %s in %s." engine-name browser-name)
(interactive ,(format "sSearch %s in %s for: " engine-name browser-name))
(,(plist-get browser :command)
(format ,(plist-get engine :format) query)))
(hmm-add-handler '(:command ,function-name) :query))))
(defmacro hmm-define-external-xdg-handler (xdg-handler)
(let* ((description (format "%s - %s"
(plist-get xdg-handler :name)
(plist-get xdg-handler :description)))
(function-name (intern
(format "hmm-%s"
(plist-get xdg-handler :xdg-desktop-name))))
(external-command
(mapcar (lambda (token)
(if (string-match "^%[fFuU]$" token)
`arg
token))
(split-string (plist-get xdg-handler :external-command))))
(name (plist-get xdg-handler :name))
(handler (plist-put xdg-handler :command function-name)))
`(progn
(defun ,function-name (arg)
,description
(interactive ,(format "sRun %s with: " name))
(apply 'start-process
(append
(list (format ,(format "%s-%%s" function-name) arg)
(format ,(format "*%s-%%s*" function-name) arg))
,(cons 'list external-command))))
(hmm-add-handler ',handler :file))))
(defun hmm-add-handler (handler handling)
(let ((handlers (plist-get hmm-handlers handling)))
(add-to-list 'handlers handler)
(plist-put hmm-handlers handling handlers)))
(defun hmm-thing-in-region (from to)
(interactive "r")
(unless (region-active-p) (error "Region not active."))
(let* ((query (buffer-substring from to)))
(hmm-query query)))
(defun hmm-thing-at-point ()
(interactive)
"Prompt for what to do with thing at point.
If it is a file, display a list of file handlers.
If it is a url, display a list of url handlers."
(let ((thing))
(cond ((setq thing (thing-at-point-url-at-point))
(hmm-url thing))
((setq thing (thing-at-point-file-at-point))
(hmm-file thing))
((and (derived-mode-p 'dired-mode)
(setq thing (dired-get-filename nil t)))
(hmm-file thing))
((derived-mode-p 'dired-mode)
(hmm-file (expand-file-name default-directory)))
((and (derived-mode-p 'org-mode)
(setq thing (my-org-link-at-point)))
(hmm-url thing))
((setq thing (get-text-property (point) 'shr-url))
(hmm-url thing))
((setq thing (thing-at-point 'symbol))
(hmm-query thing))
((setq thing (buffer-file-name))
(hmm-file thing))
((setq thing (expand-file-name default-directory))
(hmm-file thing))
(t (error "Cannot guess what to do with what.")))))
(defun hmm ()
(interactive)
(cond ((region-active-p)
(call-interactively 'hmm-thing-in-region))
(t (call-interactively 'hmm-thing-at-point))))
(define-key global-map (kbd "C-M-<return>") 'hmm)
(defun hmm-query (query)
(interactive "sQuery: ")
(hmm-open-internal query :query "Search %s using: "))
(defun hmm-url (url)
(interactive (list (read-string "URL: " (thing-at-point-url-at-point))))
(hmm-handle-internal url :url "Handle url %s using: "))
(defun hmm-file (file)
(interactive (list (read-file-name "File: " default-directory
(thing-at-point-file-at-point))))
(hmm-handle-internal file :file "Handle file %s using: "))
(defun hmm-handle-internal (thing type prompt)
(let ((selected
(completing-read
(format prompt thing)
(mapcar
(lambda (command)
(format "%s (%s)" command
(if (documentation command)
(car
(split-string
(documentation command)
"\n"))
"Undocumented")))
(hmm-filter-commands thing type)))))
(funcall-interactively (intern (car (split-string selected " ("))) thing)))
(defun hmm-filter-commands (thing type)
(let ((mimetype (hmm-file-mime-type thing)))
(mapcar
(lambda (handler)
(plist-get handler :command))
(seq-filter
(lambda (handler)
(and
(hmm-thing-match thing type handler)
(or (member mimetype
(plist-get handler :mimetypes))
(and (null (plist-get handler :mimetypes))
(not (plist-get handler :xdg-desktop-name))))))
(plist-get hmm-handlers type)))))
(defun hmm-thing-match (thing type handler)
(let ((regex (plist-get handler :regex)))
(cond ((eq type :url)
(let ((schemes (plist-get handler :schemes))
(url (url-generic-parse-url thing))
(url-no-scheme))
(and
(or (null schemes)
(member (url-type url) schemes))
(or (not regex)
(string-match
regex
(progn
(setf (url-type url) nil
(url-fullness url) nil)
(setq url-no-scheme (url-recreate-url url))))))))
(t (or (not regex)
(string-match regex thing))))))
(defun hmm-update-handlers ()
(interactive)
(dolist (engine hmm-web-search-engines)
(dolist (browser hmm-web-browsers)
(eval `(hmm-define-web-search-engine ,engine ,browser))))
(dolist (xdg-handler (hmm-get-xdg-handlers))
(eval `(hmm-define-external-xdg-handler ,xdg-handler)))
(dolist (browser hmm-web-browsers)
(hmm-add-handler
(list :command (plist-get browser :command)
:schemes (list "http" "https"))
:url)))
(defun hmm-get-xdg-handlers ()
(seq-filter
'identity
(mapcar
(lambda (desktop-file)
(condition-case nil
(let ((parsed (xdg-desktop-read-file desktop-file)))
(list
:name (gethash "Name" parsed)
:description (gethash "Comment" parsed)
:xdg-desktop-name (intern (concat "xdg-desktop-"
(file-name-base desktop-file)))
:external-command (gethash "Exec" parsed)
:mimetypes (seq-filter (lambda (s) (not (string-empty-p s)))
(split-string (gethash "MimeType" parsed) ";"))))
(error nil)))
(hmm-get-all-desktop-files))))
(defun hmm-get-all-desktop-files ()
(mapcan (lambda (dir)
(let ((app-dir (expand-file-name "applications" dir)))
(when (file-exists-p app-dir)
(directory-files app-dir t "\\.desktop$"))))
(cons (xdg-data-home) (xdg-data-dirs))))
(defun hmm-file-mime-type (file)
"Returns (or print if called interactively) mimetype of FILE."
(interactive)
(let ((out))
(when (file-exists-p file)
(replace-regexp-in-string
"^.*: \\(.*\\); .*$" "\\1"
(with-temp-buffer
(call-process "file" nil '(t t) nil "-Li" file)
(setq out (string-trim (buffer-string)))
(if (called-interactively-p)
(message out)
out))))))
(provide 'hmm)
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