fix defcustom types and improve their doc-strings

mu4e/mu4e-compose.el

@@ -90,17 +90,19 @@
   :group 'mu4e)
 
 (defcustom mu4e-sent-messages-behavior 'sent
-  "Determines what mu4e does with sent messages - this is a symbol
-which can be either:
+  "Determines what mu4e does with sent messages.
 
- * 'sent --> move the sent message to the Sent-folder (`mu4e-sent-folder')
- * 'trash --> move the sent message to the Trash-folder (`mu4e-trash-folder')
- * 'delete --> delete the sent message.
+This is one of the symbols:
+* `sent'    move the sent message to the Sent-folder (`mu4e-sent-folder')
+* `trash'   move the sent message to the Trash-folder (`mu4e-trash-folder')
+* `delete'  delete the sent message.
 
 Note, when using GMail/IMAP, you should set this to either 'trash
 or 'delete, since GMail already takes care of keeping copies in the
 sent folder."
-  :type 'symbol
+  :type '(choice (const sent :tag "move message to mu4e-sent-folder")
+		 (const sent :tag "move message to mu4e-trash-folder")
+		 (const sent :tag "delete message"))
   :safe 'symbolp
   :group 'mu4e-compose)
 

mu4e/mu4e-mark.el

@@ -31,13 +31,15 @@
 (require 'mu4e-message)
 
 (defcustom mu4e-headers-leave-behavior 'ask
-  "What to do when user leaves the headers view (e.g. quits,
-  refreshes or does a new search). Value is one of the following
-  symbols:
-- ask (ask the user whether to ignore the marks)
-- apply (automatically apply the marks before doing anything else)
-- ignore (automatically ignore the marks without asking)."
-  :type 'symbol
+  "What to do when user leaves the headers view.
+That is when he e.g. quits, refreshes or does a new search.
+Value is one of the following symbols:
+- `ask'     ask user whether to ignore the marks
+- `apply'   automatically apply the marks before doing anything else
+- `ignore'  automatically ignore the marks without asking"
+  :type '(choice (const ask    :tag "ask user whether to ignore marks")
+		 (const apply  :tag "apply marks without asking")
+		 (const ignore :tag "ignore marks without asking"))
   :group 'mu4e-headers)
 
 (defvar mu4e-headers-show-target t

mu4e/mu4e-vars.el

@@ -35,10 +35,9 @@
 
 (defcustom mu4e-mu-home nil
   "Location of the mu homedir, or nil for the default."
-  :type 'directory
   :group 'mu4e
   :type '(choice (const :tag "Default location" nil)
-                 (const :tag "Specify location" string))
+                 (directory :tag "Specify location"))
   :safe 'stringp)
 
 (defcustom mu4e-mu-binary (executable-find "mu")
@@ -49,15 +48,14 @@ PATH, you can specify the full path."
   :safe 'stringp)
 
 (defcustom mu4e-maildir (expand-file-name "~/Maildir")
-  "Your Maildir directory; by default, mu4e assumes
-~/Maildir."
+  "Your Maildir directory."
   :type 'directory
   :safe 'stringp
   :group 'mu4e)
 
 (defcustom mu4e-get-mail-command "true"
-  "Shell command to run to retrieve new mail; e.g. 'offlineimap' or
-'fetchmail'."
+  "Shell command to run to retrieve new mail.
+Common values are \"offlineimap\" and \"fetchmail\"."
   :type 'string
   :group 'mu4e
   :safe 'stringp)
@@ -107,10 +105,11 @@ personal message. This is used when indexing messages."
   :group 'mu4e)
 
 (defcustom mu4e-search-results-limit 500
-  "Maximum number of search results (or -1 for unlimited). Since
-limiting search results speeds up searches significantly, it's
-useful to limit this. Note, to ignore the limit, use a prefix
-argument (C-u) before invoking the search."
+  "Maximum number of search results.
+Use -1 for no limit.  Since limiting search results speeds up
+searches significantly, it's useful to limit this. Note, to
+ignore the limit, use a prefix argument (C-u) before invoking the
+search."
   :type '(choice (const :tag "Unlimited" -1)
                  (integer :tag "Limit"))
   :group 'mu4e)

mu4e/mu4e-view.el

@@ -51,8 +51,8 @@
 
 (defcustom mu4e-view-fields
   '(:from :to  :cc :subject :flags :date :maildir :tags :attachments :signature)
-  "Header fields to display in the message view buffer. For the
-complete list of available headers, see `mu4e-header-info'."
+  "Header fields to display in the message view buffer.
+For the complete list of available headers, see `mu4e-header-info'."
   :type (list 'symbol)
   :group 'mu4e-view)
 
@@ -69,14 +69,14 @@ contact."
 
 (defcustom mu4e-view-date-format "%c"
   "Date format to use in the message view, in the format of
-  `format-time-string'."
+`format-time-string'."
   :type 'string
   :group 'mu4e-view)
 
 (defcustom mu4e-view-image-max-width 800
-  "The maximum width for images to display; this is only effective
-  if you're using an emacs with Imagemagick support, and
-  `mu4e-show-image' is non-nil."
+  "The maximum width for images to display.
+This is only effective if you're using an emacs with Imagemagick
+support, and `mu4e-show-image' is non-nil."
   :group 'mu4e-view)
 
 (defcustom mu4e-view-scroll-to-next t