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|
;;; browser-config.el --- Browser Configuration -*- lexical-binding: t; coding: utf-8; -*-
;; author: Craig Jennings <c@cjennings.net>
;;; Commentary:
;;
;; Layer: 3 (Domain Workflow).
;; Category: D/P.
;; Load shape: eager.
;; Eager reason: registers one browser-selection key; a command-loaded deferral
;; candidate.
;; Top-level side effects: one global key binding.
;; Runtime requires: cl-lib.
;; Direct test load: yes.
;;
;; This module provides browser selection and configuration for Emacs.
;; It automatically discovers available browsers on the system, allows the user
;; to choose their preferred browser via completing-read, and persists the choice
;; to a file. Works with all link types including org-mode links.
;;
;; Interactive Commands:
;; M-x cj/choose-browser - Select default browser from available options
;;; Code:
(require 'cl-lib)
;; Persistence file for storing browser choice
(defvar cj/browser-choice-file
(expand-file-name "browser-choice.el" user-emacs-directory)
"File to persist the user's browser choice.")
;; Browser definitions: (executable-name browse-function display-name [program-var])
;; Use nil for executable-name to indicate a built-in Emacs browser (always available)
(defvar cj/browser-definitions
'((nil eww-browse-url "EWW (Emacs Browser)" nil)
("google-chrome" browse-url-chrome "Google Chrome" browse-url-chrome-program)
("google-chrome-stable" browse-url-chrome "Google Chrome" browse-url-chrome-program)
("chrome" browse-url-chrome "Chrome" browse-url-chrome-program)
("chromium" browse-url-chromium "Chromium" browse-url-chromium-program)
("chromium-browser" browse-url-chromium "Chromium" browse-url-chromium-program)
("firefox" browse-url-firefox "Firefox" browse-url-firefox-program)
("brave" browse-url-chrome "Brave" browse-url-chrome-program)
("brave-browser" browse-url-chrome "Brave Browser" browse-url-chrome-program)
("microsoft-edge" browse-url-chrome "Microsoft Edge" browse-url-chrome-program)
("vivaldi" browse-url-chrome "Vivaldi" browse-url-chrome-program)
("opera" browse-url-chrome "Opera" browse-url-chrome-program)
("qutebrowser" browse-url-generic "qutebrowser" browse-url-generic-program))
"List of browser definitions.
Each entry is (EXECUTABLE BROWSE-FUNCTION DISPLAY-NAME [PROGRAM-VAR]).
Use nil for EXECUTABLE to indicate a built-in Emacs browser (always available).")
(defun cj/discover-browsers ()
"Discover available browsers on the system.
Returns a list of plists with :executable, :function, :name, and :path.
Includes built-in Emacs browsers (those with nil executable)."
(let ((found-browsers '())
(seen-names (make-hash-table :test 'equal)))
(dolist (def cj/browser-definitions)
(let* ((executable (nth 0 def))
(browse-fn (nth 1 def))
(display-name (nth 2 def))
(program-var (nth 3 def))
(path (when executable (executable-find executable)))
;; Built-in browsers (nil executable) are always available
(available-p (or (null executable) path)))
(when (and available-p (not (gethash display-name seen-names)))
(puthash display-name t seen-names)
(push (list :executable executable
:function browse-fn
:name display-name
:path path
:program-var program-var)
found-browsers))))
(nreverse found-browsers)))
(defun cj/save-browser-choice (browser-plist)
"Save BROWSER-PLIST to the persistence file."
(with-temp-file cj/browser-choice-file
(insert ";;; browser-choice.el --- Generated browser selection -*- lexical-binding: t; -*-\n")
(insert ";;\n")
(insert ";; Generated by browser-config.el. Do not edit by hand; use\n")
(insert ";; `cj/choose-browser' to rewrite this file.\n")
(insert (format "(setq cj/saved-browser-choice '%S)\n" browser-plist))))
(defun cj/load-browser-choice ()
"Load browser choice from the persistence file.
Returns the browser plist if found, nil otherwise."
(when (file-exists-p cj/browser-choice-file)
(condition-case nil
(progn
(load cj/browser-choice-file)
(when (boundp 'cj/saved-browser-choice)
cj/saved-browser-choice))
(error nil))))
(defun cj/--do-apply-browser-choice (browser-plist)
"Apply the browser settings from BROWSER-PLIST.
Returns: \\='success if applied successfully,
\\='invalid-plist if browser-plist is nil or missing required keys."
(if (null browser-plist)
'invalid-plist
(let ((browse-fn (plist-get browser-plist :function))
(executable (plist-get browser-plist :executable))
(path (plist-get browser-plist :path))
(program-var (plist-get browser-plist :program-var)))
(if (null browse-fn)
'invalid-plist
(setq browse-url-browser-function browse-fn)
;; Set the specific browser program variable if it exists
(when program-var
(set program-var (or path executable)))
'success))))
(defun cj/--do-choose-browser (browser-plist)
"Save and apply BROWSER-PLIST as the default browser.
Returns: \\='success if browser was saved and applied,
\\='save-failed if save operation failed,
\\='invalid-plist if browser-plist is invalid."
(condition-case _err
(progn
(cj/save-browser-choice browser-plist)
(let ((result (cj/--do-apply-browser-choice browser-plist)))
(if (eq result 'success)
'success
'invalid-plist)))
(error 'save-failed)))
(defun cj/choose-browser ()
"Interactively choose a browser from available options.
Persists the choice for future sessions."
(interactive)
(let* ((browsers (cj/discover-browsers))
(choices (mapcar (lambda (b) (plist-get b :name)) browsers)))
(if (null browsers)
(message "No supported browsers found on system PATH")
(let* ((choice (completing-read "Choose default browser: " choices nil t))
(selected (cl-find-if (lambda (b)
(string= (plist-get b :name) choice))
browsers)))
(when selected
(pcase (cj/--do-choose-browser selected)
('success (message "Default browser set to: %s" (plist-get selected :name)))
('save-failed (message "Failed to save browser choice"))
('invalid-plist (message "Invalid browser configuration"))))))))
(defun cj/--preferred-default-browser (browsers)
"Return the browser plist to adopt as the first-run default from BROWSERS.
Prefers the first entry with a non-nil :executable -- a real external
browser -- and falls back to the first entry overall when none is
installed. Built-in browsers carry a nil :executable and so are always
\"available\", which put EWW at the head of `cj/discover-browsers' on
every machine. Taking the head therefore opened every link in the text
browser on a fresh checkout even with Chrome installed, until the user
happened to run `cj/choose-browser'. EWW stays reachable as the
deliberate fallback when nothing external is on PATH.
Returns nil for an empty BROWSERS list."
(or (seq-find (lambda (b) (plist-get b :executable)) browsers)
(car browsers)))
;; Initialize: Load saved choice or use the preferred available browser
(defun cj/--do-initialize-browser ()
"Initialize browser configuration.
Returns: (cons \\='loaded browser-plist) if saved choice was loaded,
(cons \\='first-available browser-plist) if using first
discovered browser,
(cons \\='no-browsers nil) if no browsers found."
(let ((saved-choice (cj/load-browser-choice)))
(if saved-choice
(cons 'loaded saved-choice)
;; No saved choice - adopt the preferred available browser
(let ((browsers (cj/discover-browsers)))
(if browsers
(cons 'first-available (cj/--preferred-default-browser browsers))
(cons 'no-browsers nil))))))
(defun cj/initialize-browser ()
"Initialize browser configuration on startup."
(let ((result (cj/--do-initialize-browser)))
(pcase (car result)
('loaded
(cj/--do-apply-browser-choice (cdr result)))
('first-available
(let ((browser (cdr result)))
(cj/--do-apply-browser-choice browser)
(message "No browser configured. Using %s. Run M-x cj/choose-browser to change."
(plist-get browser :name))))
('no-browsers
(message "No supported browsers found")))))
;; Run initialization
(cj/initialize-browser)
(keymap-global-set "C-; B" #'cj/choose-browser)
(provide 'browser-config)
;;; browser-config.el ends here
|
