notmuch/devel/try-emacs-mua
Jonas Bernoulli 1c80020e70 try-emacs-mua: Trim `require' advice for Emacs 25
- Since Emacs 25 comes with `load-prefer-newer' we can remove the
  complicated variant of the advice, which implemented a poorman's
  version of that.

- Since Emacs 25 comes with the new advice mechanism, we can use
  that now for the simple variant of the advice, which just informs
  about the library that is being required.
2020-08-09 21:17:50 -03:00

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#!/bin/sh
:; set -x; exec "${EMACS:-emacs}" --debug-init --load "$0" "$@"; exit
;;
;; Try the notmuch emacs client located in ../emacs/ directory
;;
;; Run this without arguments; emacs window opens with some usage information
;;
;; Authors: Tomi Ollila <tomi.ollila@iki.fi>
;;
;; https://www.emacswiki.org/emacs/EmacsScripts was a useful starting point...
;;
;; Licence: GPLv3+
;;
(message "Starting '%s'" load-file-name)
(set-buffer "*scratch*")
(setq initial-buffer-choice nil
inhibit-startup-screen t)
(when (featurep 'notmuch)
(insert "
Notmuch has been loaded to this emacs (during processing of the init file)
which means it is (most probably) loaded from different source than expected.
Please run \"" (file-name-nondirectory load-file-name)
"\" with '-q' (or '-Q') as an argument, to disable
processing of the init file -- you can load it after emacs has started\n
exit emacs (y or n)? ")
(if (y-or-n-p "exit emacs")
(kill-emacs)
(error "Stopped reading %s" load-file-name)))
(let ((pdir (file-name-directory
(directory-file-name (file-name-directory load-file-name)))))
(unless (file-exists-p (concat pdir "emacs/notmuch-lib.el"))
(insert "Cannot find notmuch-emacs source directory
while looking at: " pdir "emacs\n\nexit emacs (y or n)? ")
(if (y-or-n-p "exit emacs")
(kill-emacs)
(error "Stopped reading %s" load-file-name)))
(setq try-notmuch-source-directory (directory-file-name pdir)
try-notmuch-emacs-directory (concat pdir "emacs/")
load-path (cons try-notmuch-emacs-directory load-path)))
(define-advice require
(:before (feature &optional _filename _noerror) notmuch)
(unless (featurep feature)
(message "require: %s" feature)))
(insert "Found notmuch emacs client in " try-notmuch-emacs-directory "\n")
(let ((notmuch-path (executable-find "notmuch")))
(insert "Notmuch CLI executable "
(if notmuch-path (concat "is " notmuch-path) "not found!") "\n"))
(condition-case err
;; "opportunistic" load-prefer-newer -- will be effective since emacs 24.4
(let ((load-prefer-newer t)
(force-load-messages t))
(require 'notmuch))
;; specifying `debug' here lets the debugger run
;; if `debug-on-error' is non-nil.
((debug error)
(let ((error-message-string (error-message-string err)))
(insert "\nLoading notmuch failed: " error-message-string "\n")
(message "Loading notmuch failed: %s" error-message-string)
(insert "See *Messages* buffer for more information.\n")
(if init-file-user
(message "Hint: %s -q (or -Q) may help" load-file-name))
(pop-to-buffer "*Messages*")
(error "Stopped reading %s" load-file-name))))
(insert "
Go to the end of the following lines and type C-x C-e to evaluate
(or C-j which is shorter but inserts evaluation results into buffer)
To \"disable\" mail sending, evaluate
* (setq message-send-mail-function (lambda () t))
")
(if (file-exists-p (concat try-notmuch-source-directory "/notmuch"))
(insert "
To use accompanied notmuch binary from the same source, evaluate
* (setq exec-path (cons \"" try-notmuch-source-directory "\" exec-path))
Note: Evaluating the above may be followed by unintended database
upgrade and getting back to old version may require dump & restore.
"))
(if init-file-user ;; nil, if '-q' or '-Q' is given, but no '-u' 'USER'
(insert "
Your init file was processed during emacs startup. If you want to test
notmuch emacs mail client without your emacs init file interfering, Run\n\""
(file-name-nondirectory load-file-name) "\" with '-q' (or '-Q') as an argument.
")
(let ((emacs-init-file-name) (notmuch-init-file-name))
;; determining init file name in startup.el/command-line is too complicated
;; to be duplicated here; these 3 file names covers most of the users
(mapc (lambda (fn) (if (file-exists-p fn) (setq emacs-init-file-name fn)))
'("~/.emacs.d/init.el" "~/.emacs" "~/.emacs.el"))
(setq notmuch-init-file-name "~/.emacs.d/notmuch-config.el")
(unless (file-exists-p notmuch-init-file-name)
(setq notmuch-init-file-name nil))
(if (and emacs-init-file-name notmuch-init-file-name)
(insert "
If you want to load your initialization files now, evaluate\n* (progn")
(if (or emacs-init-file-name notmuch-init-file-name)
(insert "
If you want to load your initialization file now, evaluate\n*")))
(if emacs-init-file-name
(insert " (load \"" emacs-init-file-name "\")"))
(if notmuch-init-file-name
(insert " (load \"" notmuch-init-file-name "\")"))
(if (and emacs-init-file-name notmuch-init-file-name)
(insert ")"))
(if (or emacs-init-file-name notmuch-init-file-name)
(insert "\n")))
(if (>= emacs-major-version 24)
(insert "
If you want to use packages (e.g. company from elpa) evaluate
* (progn (require 'package) (package-initialize))
")))
(insert "
To start notmuch (hello) screen, evaluate
* (notmuch-hello)")
(add-hook 'emacs-startup-hook
(lambda ()
(with-current-buffer "*scratch*"
(lisp-interaction-mode)
(goto-char (point-min))
(forward-line 2)
(set-buffer-modified-p nil))))
;; Local Variables:
;; mode: emacs-lisp
;; End: