Completely use cl-lib and lexical-binding

Previously both cl-lib.el and cl.el were used, now use only cl-lib.el.
Use lexical-binding where needed instead of requiring cl just for
`lexical-let`.
Replace some add-to-list with cl-pushnew as add-to-list is not
recommended in lisp program and anyway doesn't work properly with
lexical binding.

8 files changed, 78 insertions, 82 deletions

diff --git a/mu4e/mu4e-compose.el b/mu4e/mu4e-compose.el
index d7d7d8d..85ee2ab 100644
--- a/mu4e/mu4e-compose.el
+++ b/mu4e/mu4e-compose.el
@@ -1,4 +1,4 @@
-;; mu4e-compose.el -- part of mu4e, the mu mail user agent for emacs
+;; mu4e-compose.el -- part of mu4e, the mu mail user agent for emacs -*- lexical-binding: t -*-
 ;;
 ;; Copyright (C) 2011-2019 Dirk-Jan C. Binnema
 
@@ -66,8 +66,7 @@
 ;;
 
 ;;; Code:
-(eval-when-compile
-  (require 'cl))
+(require 'cl-lib)
 (require 'message)
 (require 'mail-parse)
 (require 'smtpmail)
@@ -270,7 +269,8 @@ If needed, set the Fcc header, and register the handler function."
       ;; etc. if you run it after mu4e so, (hack hack) we reset it to the old
       ;; handler after we've done our thing.
       (setq message-fcc-handler-function
-  (lexical-let ((maildir mdir) (old-handler message-fcc-handler-function))
+  (let ((maildir mdir)
+        (old-handler message-fcc-handler-function))
     (lambda (file)
       (setq message-fcc-handler-function old-handler) ;; reset the fcc handler
       (let ((mdir-path (concat mu4e-maildir maildir)))
@@ -278,8 +278,8 @@ If needed, set the Fcc header, and register the handler function."
         ;; `mu4e~proc-mkdir` runs asynchronously but no matter whether it runs before or after
         ;; `write-file`, the sent maildir ends up in the correct state.
         (unless (file-exists-p mdir-path)
-    (mu4e~proc-mkdir mdir-path)))
-      (write-file file)		       ;; writing maildirs files is easy
+          (mu4e~proc-mkdir mdir-path)))
+      (write-file file) ;; writing maildirs files is easy
       (mu4e~proc-add file (or maildir "/")))))))) ;; update the database
 
 (defvar mu4e-compose-hidden-headers
@@ -734,7 +734,7 @@ buffer."
       (while (re-search-forward "<[^ <]+@[^ <]+>" nil t)
         (push (match-string 0) refs))
       ;; the last will be the first
-      (setq forwarded-from (first refs))))))
+      (setq forwarded-from (cl-first refs))))))
     ;; remove the <>
     (when (and in-reply-to (string-match "<\\(.*\\)>" in-reply-to))
       (mu4e~proc-move (match-string 1 in-reply-to) nil "+R-N"))
diff --git a/mu4e/mu4e-headers.el b/mu4e/mu4e-headers.el
index 5688ba1..29a090c 100644
--- a/mu4e/mu4e-headers.el
+++ b/mu4e/mu4e-headers.el
@@ -1,4 +1,4 @@
-;;; mu4e-headers.el -- part of mu4e, the mu mail user agent
+;;; mu4e-headers.el -- part of mu4e, the mu mail user agent -*- lexical-binding: t -*-
 ;;
 ;; Copyright (C) 2011-2017 Dirk-Jan C. Binnema
 
@@ -1809,10 +1809,10 @@ do nothing."
 	 ;; emacs has weird ideas about what horizontal, vertical means...
 	 (horizontal
 	   (window-resize hwin n nil)
-	   (incf mu4e-headers-visible-lines n))
+	   (cl-incf mu4e-headers-visible-lines n))
 	 (vertical
 	   (window-resize hwin n t)
-	   (incf mu4e-headers-visible-columns n)))))))
+	   (cl-incf mu4e-headers-visible-columns n)))))))
 
 (defun mu4e-headers-split-view-shrink (&optional n)
   "In split-view, shrink the headers window.
diff --git a/mu4e/mu4e-icalendar.el b/mu4e/mu4e-icalendar.el
index 6ab7d7e..1720c0a 100644
--- a/mu4e/mu4e-icalendar.el
+++ b/mu4e/mu4e-icalendar.el
@@ -41,8 +41,7 @@
 
 (require 'mu4e)
 (require 'gnus-icalendar)
-
-(eval-when-compile (require 'cl))
+(require 'cl-lib)
 
 ;;;###autoload
 (defun mu4e-icalendar-setup ()
diff --git a/mu4e/mu4e-main.el b/mu4e/mu4e-main.el
index 749443d..33bdcfe 100644
--- a/mu4e/mu4e-main.el
+++ b/mu4e/mu4e-main.el
@@ -1,4 +1,4 @@
-;;; mu4e-main.el -- part of mu4e, the mu mail user agent
+;;; mu4e-main.el -- part of mu4e, the mu mail user agent -*- lexical-binding: t -*-
 ;;
 ;; Copyright (C) 2011-2016 Dirk-Jan C. Binnema
 
@@ -27,9 +27,7 @@
 (require 'smtpmail)      ;; the queing stuff (silence elint)
 (require 'mu4e-utils)    ;; utility functions
 (require 'mu4e-context)  ;; the context
-
-(eval-when-compile
-  (require 'cl))
+(require 'cl-lib)
 
 (defconst mu4e~main-buffer-name " *mu4e-main*"
   "*internal* Name of the mu4e main view buffer.")
@@ -99,9 +97,8 @@ clicked."
 	(func (if (functionp func-or-shortcut)
 		  func-or-shortcut
 		(if (stringp func-or-shortcut)
-		    (lexical-let ((macro func-or-shortcut))
-		      (lambda()(interactive)
-			(execute-kbd-macro macro)))))))
+                    (lambda()(interactive)
+			   (execute-kbd-macro func-or-shortcut))))))
     (define-key map [mouse-2] func)
     (define-key map (kbd "RET") func)
     (put-text-property 0 (length newstr) 'keymap map newstr)
diff --git a/mu4e/mu4e-utils.el b/mu4e/mu4e-utils.el
index abb83fa..7a8271b 100644
--- a/mu4e/mu4e-utils.el
+++ b/mu4e/mu4e-utils.el
@@ -1,4 +1,4 @@
-;;; mu4e-utils.el -- part of mu4e, the mu mail user agent
+;;; mu4e-utils.el -- part of mu4e, the mu mail user agent -*- lexical-binding: t -*-
 ;;
 ;; Copyright (C) 2011-2019 Dirk-Jan C. Binnema
 
@@ -26,7 +26,6 @@
 
 ;;; Code:
 (eval-when-compile
-  (require 'cl)
   (require 'org nil 'noerror))
 (require 'cl-lib)
 (require 'mu4e-vars)
@@ -97,7 +96,7 @@ insensitive comparison is used."
 `funcall'."
   (declare (indent 2))
   `(let* ((vars (and ,context (mu4e-context-vars ,context))))
-     (progv ;; XXX: perhaps use eval's lexical environment instead of progv?
+     (cl-progv ;; XXX: perhaps use eval's lexical environment instead of progv?
        (mapcar (lambda(cell) (car cell)) vars)
        (mapcar (lambda(cell) (cdr cell)) vars)
        (eval ,@body))))
@@ -143,9 +142,8 @@ return the result."
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 (defun mu4e-remove-file-later (filename)
   "Remove FILENAME in a few seconds."
-  (lexical-let ((filename filename))
-    (run-at-time "30 sec" nil
-      (lambda () (ignore-errors (delete-file filename))))))
+  (run-at-time "30 sec" nil
+               (lambda () (ignore-errors (delete-file filename)))))
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -469,11 +467,12 @@ replaces any existing bookmark with KEY."
          (lambda (bm)
 	   (= (mu4e-bookmark-key bm) key))
          (mu4e-bookmarks)))
-  (add-to-list 'mu4e-bookmarks
-               (make-mu4e-bookmark
+  (cl-pushnew (make-mu4e-bookmark
                 :name name
                 :query query
-                :key key) t))
+                :key key)
+              mu4e-bookmarks
+              :test 'equal))
 
 
 ;;; converting flags->string and vice-versa ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -702,7 +701,7 @@ This is used by the completion function in mu4e-compose."
       (setq mu4e~contacts (make-hash-table :test 'equal :weakness nil
 		                        :size (length contacts))))
     (dolist (contact contacts)
-      (incf n)
+      (cl-incf n)
       (let ((address
               (if (functionp mu4e-contact-process-function)
                 (funcall mu4e-contact-process-function (car contact))
@@ -789,33 +788,32 @@ first. If mu4e is already running, execute function FUNC (if
 non-nil). Otherwise, check various requireme`'nts, then start mu4e.
 When successful, call FUNC (if non-nil) afterwards."
   ;; if we're already running, simply go to the main view
-  (if (mu4e-running-p)   ;; already running?
-    (when func (funcall func)) ;; yes! run func if defined
+  (if (mu4e-running-p)         ;; already running?
+      (when func (funcall func)) ;; yes! run func if defined
     (progn
       ;; no! try to set a context, do some checks, set up pong handler and ping
       ;; the server maybe switch the context
       (mu4e~context-autoswitch nil mu4e-context-policy)
-      (lexical-let ((func func))
-	(mu4e~check-requirements)
-	;; set up the 'pong' handler func
-	(setq mu4e-pong-func
-	  (lambda (props)
-	    (setq mu4e~server-props props) ;; save props from the server
-	    (let ((version (plist-get props :version))
-		         (doccount (plist-get props :doccount)))
-	      (mu4e~check-requirements)
-	      (when func (funcall func))
-        (when (zerop doccount)
-          (mu4e-message "Store is empty; (re)indexing. This can take a while.");
-          (mu4e-update-index))
-	      (when (and mu4e-update-interval (null mu4e~update-timer))
-		      (setq mu4e~update-timer
+      (mu4e~check-requirements)
+      ;; set up the 'pong' handler func
+      (setq mu4e-pong-func
+	    (lambda (props)
+	      (setq mu4e~server-props props) ;; save props from the server
+	      (let ((version (plist-get props :version))
+		    (doccount (plist-get props :doccount)))
+	        (mu4e~check-requirements)
+	        (when func (funcall func))
+                (when (zerop doccount)
+                  (mu4e-message "Store is empty; (re)indexing. This can take a while.") ;
+                  (mu4e-update-index))
+	        (when (and mu4e-update-interval (null mu4e~update-timer))
+		  (setq mu4e~update-timer
 		        (run-at-time
-		          0 mu4e-update-interval
-		          (lambda () (mu4e-update-mail-and-index
-				                   mu4e-index-update-in-background)))))
-	      (mu4e-message "Started mu4e with %d message%s in store"
-		      doccount (if (= doccount 1) "" "s"))))))
+		         0 mu4e-update-interval
+		         (lambda () (mu4e-update-mail-and-index
+				     mu4e-index-update-in-background)))))
+	        (mu4e-message "Started mu4e with %d message%s in store"
+		              doccount (if (= doccount 1) "" "s")))))
       ;; wake up server
       (mu4e~proc-ping)
       ;; maybe request the list of contacts, automatically refresh after
@@ -1084,10 +1082,10 @@ This includes expanding e.g. 3-5 into 3,4,5.  If the letter
 	  (setq beg (string-to-number (match-string 1 elem))
 	    end (string-to-number (match-string 2 elem)))
 	  (while (<= beg end)
-	    (add-to-list 'list beg 'append)
+            (cl-pushnew beg list :test 'equal)
 	    (setq beg (1+ beg))))
 	;; else just a number
-	(add-to-list 'list (string-to-number elem) 'append)))
+        (cl-pushnew (string-to-number elem) list :test 'equal)))
     ;; Check that all numbers are valid.
     (mapc
       #'(lambda (x)
@@ -1167,15 +1165,15 @@ displaying it). Do _not_ bury the current buffer, though."
   (interactive)
   (unless (file-exists-p path)
     (mu4e-error "Cannot find %s" path))
-  (lexical-let ((curbuf (current-buffer)))
+  (let ((curbuf (current-buffer)))
     (find-file path)
     (mu4e-org-mode)
     (setq buffer-read-only t)
     (define-key mu4e-org-mode-map (kbd "q")
-      (lambda ()
-	(interactive)
-	(bury-buffer)
-	(switch-to-buffer curbuf)))))
+      `(lambda ()
+	 (interactive)
+	 (bury-buffer)
+	 (switch-to-buffer ,curbuf)))))
 
 (defun mu4e-about ()
   "Show the mu4e 'about' page."
diff --git a/mu4e/mu4e-view.el b/mu4e/mu4e-view.el
index b695e06..21ebd0a 100644
--- a/mu4e/mu4e-view.el
+++ b/mu4e/mu4e-view.el
@@ -1,4 +1,4 @@
-;;; mu4e-view.el -- part of mu4e, the mu mail user agent
+;;; mu4e-view.el -- part of mu4e, the mu mail user agent -*- lexical-binding: t -*-
 ;;
 ;; Copyright (C) 2011-2018 Dirk-Jan C. Binnema
 
@@ -26,8 +26,6 @@
 ;; viewing e-mail messages
 
 ;;; Code:
-(eval-when-compile
-  (require 'cl))
 (require 'cl-lib)
 (require 'mu4e-utils) ;; utility functions
 (require 'mu4e-vars)
@@ -47,6 +45,8 @@
 (require 'calendar)
 
 (declare-function mu4e-view-mode "mu4e-view")
+(defvar gnus-icalendar-additional-identities)
+(defvar mu4e~headers-view-win)
 
 ;; the message view
 (defgroup mu4e-view nil
@@ -208,6 +208,12 @@ message extracted at some path.")
 (defvar mu4e~view-attach-map nil
   "A mapping of user-visible attachment number to the actual part index.")
 (put 'mu4e~view-attach-map 'permanent-local t)
+
+(defvar mu4e~view-rendering nil)
+
+(defvar mu4e~view-html-text nil
+  "Should we prefer html or text just this once? A symbol `text'
+or `html' or nil.")
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 (defun mu4e-view-message-with-message-id (msgid)
@@ -635,7 +641,7 @@ add text-properties to VAL."
 		(let ((index (mu4e-message-part-field part :index))
 		       (name (mu4e-message-part-field part :name))
 		       (size (mu4e-message-part-field part :size)))
-		  (incf id)
+		  (cl-incf id)
 		  (puthash id index mu4e~view-attach-map)
 
 		  (concat
@@ -921,14 +927,12 @@ The browser that is called depends on
 `browse-url-browser-function' and `browse-url-mailto-function'."
   (save-match-data
     (if (string-match "^mailto:" url)
-      (lexical-let ((url url))
 	(lambda ()
 	  (interactive)
-	  (browse-url-mail url)))
-      (lexical-let ((url url))
-	(lambda ()
-	  (interactive)
-	  (browse-url url))))))
+	  (browse-url-mail url))
+      (lambda ()
+        (interactive)
+        (browse-url url)))))
 
 (defun mu4e~view-browse-url-from-binding (&optional url)
   "View in browser the url at point, or click location.
@@ -945,7 +949,7 @@ If the url is mailto link, start writing an email to that address."
   "Show attached images, if `mu4e-show-images' is non-nil."
   (when (and (display-images-p) mu4e-view-show-images)
     (mu4e-view-for-each-part msg
-      (lambda (msg part)
+      (lambda (_msg part)
 	(when (string-match "^image/"
 		(or (mu4e-message-part-field part :mime-type)
 		  "application/object-stream"))
@@ -976,7 +980,7 @@ Also number them so they can be opened using `mu4e-view-go-to-url'."
 	  (when bounds
 	    (let* ((url (thing-at-point-url-at-point))
 		    (ov (make-overlay (car bounds) (cdr bounds))))
-	      (puthash (incf num) url mu4e~view-link-map)
+	      (puthash (cl-incf num) url mu4e~view-link-map)
 	      (add-text-properties
 		(car bounds)
 		(cdr bounds)
@@ -1074,10 +1078,6 @@ the new docid. Otherwise, return nil."
     (mu4e-view-refresh)
     (mu4e~view-hide-cited)))
 
-(defvar mu4e~view-html-text nil
-  "Should we prefer html or text just this once? A symbol `text'
-or `html' or nil.")
-
 (defun mu4e-view-toggle-html ()
   "Toggle html-display of the message body (if any)."
   (interactive)
@@ -1189,7 +1189,7 @@ Add this function to `mu4e-view-mode-hook' to enable this feature."
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; attachment handling
-(defun mu4e~view-get-attach-num (prompt msg &optional multi)
+(defun mu4e~view-get-attach-num (prompt _msg &optional multi)
   "Ask the user with PROMPT for an attachment number for MSG, and
 ensure it is valid. The number is [1..n] for attachments
 \[0..(n-1)] in the message. If MULTI is nil, return the number for
@@ -1591,7 +1591,7 @@ this is the default, you may not need it."
 
 (defun mu4e-view-for-each-uri (func)
   "Evaluate FUNC(uri) for each uri in the current message."
-  (maphash (lambda (num uri) (funcall func uri)) mu4e~view-link-map))
+  (maphash (lambda (_num uri) (funcall func uri)) mu4e~view-link-map))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
diff --git a/mu4e/org-mu4e.el b/mu4e/org-mu4e.el
index e39abc7..4f3a572 100644
--- a/mu4e/org-mu4e.el
+++ b/mu4e/org-mu4e.el
@@ -197,9 +197,10 @@ and images in a multipart/related part."
                        url (file-name-directory current-file)))
                 (ext (file-name-extension path))
                 (id (replace-regexp-in-string "[\/\\\\]" "_" path)))
-           (add-to-list 'html-images
-                        (org~mu4e-mime-file
-        (concat "image/" ext) path id))
+           (cl-pushnew (org~mu4e-mime-file
+                         (concat "image/" ext) path id)
+                       html-images
+                       :test 'equal)
            id)))
       str)
      html-images)))
diff --git a/mu4e/org-old-mu4e.el b/mu4e/org-old-mu4e.el
index 24ca257..0d8151f 100644
--- a/mu4e/org-old-mu4e.el
+++ b/mu4e/org-old-mu4e.el
@@ -143,9 +143,10 @@ and images in a multipart/related part."
                        url (file-name-directory current-file)))
                 (ext (file-name-extension path))
                 (id (replace-regexp-in-string "[\/\\\\]" "_" path)))
-           (add-to-list 'html-images
-                        (org~mu4e-mime-file
-			  (concat "image/" ext) path id))
+           (cl-pushnew (org~mu4e-mime-file
+			  (concat "image/" ext) path id)
+                       html-images
+                       :test 'equal)
            id)))
       str)
      html-images)))