2017-08-24-emacs-use-mu4e

需要设置一个环境变量，emacs中这样设置：

    (setenv "XAPIAN_CJK_NGRAM" "1")

shell中直接 export XAPIAN_CJK_NGRAM=1 就可以了。

搜索中文件的时候不能直接输入中文。需要使用条件搜索。先看看 mu help find 的例子：

    Some examples:
     # get all messages with 'bananas' in body, subject or recipient fields:
     $ mu find bananas

     # get all messages regarding bananas from John with an attachment:
     $ mu find from:john flag:attach bananas

     # get all messages with subject wombat in June 2009
     $ mu find subject:wombat date:20090601..20090630

    See the `mu-find' and `mu-easy' man-pages for more information.

实际测试中，使用 b:中文 可以搜到内容中的中文。（没有空格）

实际测试中，使用 s: 中文 可以搜到subject（抬头）中的中文。（有空格）

好像使用 b:中文 更全面一点。

其实直接搜中文都可以的。这个需要再看下mu4e的搜索规则。

    Using the below key bindings, you can do various things with these
    messages; these actions are also listed in the Headers menu in the
    emacs menu bar.

    key          description
    ===========================================================
    n,p          view the next, previous message
    ],[          move to the next, previous unread message
    y            select the message view (if it's visible)
    RET          open the message at point in the message view

    searching
    ---------
    s            search
    S            edit last query
    /            narrow the search
    b            search bookmark
    B            edit bookmark before search
    j            jump to maildir
    M-left,\     previous query
    M-right      next query

    O            change sort order
    P            toggle threading
    Q            toggle full-search
    V            toggle skip-duplicates
    W            toggle include-related

    marking
    -------
    d            mark for moving to the trash folder
    =            mark for removing trash flag ('untrash')
    DEL,D        mark for complete deletion
    m            mark for moving to another maildir folder
    r            mark for refiling
    +,-          mark for flagging/unflagging
    ?,!          mark message as unread, read

    u            unmark message at point
    U            unmark *all* messages

    %            mark based on a regular expression
    T,t          mark whole thread, subthread

    <insert>,*   mark for 'something' (decide later)
    #            resolve deferred 'something' marks

    x            execute actions for the marked messages

    composition
    -----------
    R,F,C        reply/forward/compose
    E            edit (only allowed for draft messages)


    misc
    ----
    ;            switch focus
    a            execute some custom action on a header
    |            pipe message through shell command
    C-+,C--      increase / decrease the number of headers shown
    H            get help
    C-S-u        update mail & reindex
    q            leave the headers buffer

我常用的：

    5.3 Opening and saving attachments

    By default, mu4e uses the xdg-open-program 26 or (on MacOS) the open program for opening attachments. If you want to use another program, you do so by setting the MU_PLAY_PROGRAM environment variable to the program to be used.

    The default directory for extracting (saving) attachments is your home directory (~/); you can change this using the variable mu4e-attachment-dir, for example:

    (setq mu4e-attachment-dir  "~/Downloads")

    For more flexibility, mu4e-attachment-dir can also be a user-provided function. This function receives two parameters: the file-name and the mime-type as found in the e-mail message27 of the attachment, either or both of which can be nil. For example:

    (setq mu4e-attachment-dir
      (lambda (fname mtype)
        (cond
          ;; docfiles go to ~/Desktop
          ((and fname (string-match "\\.doc$" fname))  "~/Desktop")
          ;; ... other cases  ...
          (t "~/Downloads")))) ;; everything else

    You can extract multiple attachments at once by prefixing the extracting command by C-u; so C-u e asks you for a range of attachments to extract (for example, 1 3-6 8). The range "‘a’" is a shortcut for all attachments.

我是这样设置的：

    (setq mu4e-attachment-dir
      (lambda (fname mtype)
        (cond
          ;; zip and rar file go to ~/Downloads
          ((and fname (string-match "\\.zip$" fname))  "~/Downloads")
          ((and fname (string-match "\\.rar$" fname))  "~/Downloads")

          ;; document to and rar file go to ~/Documents
          ((and fname (string-match "\\.pdf$" fname))  "~/Documents")
          ((and fname (string-match "\\.doc$" fname))  "~/Documents")

          ;; ... other cases  ...
          (t "/tmp")))) ;; everything else

这样可以使用 C-u e 来保存所有附件。

7.1 Queries

mu4e queries are the same as the ones that mu find understands^30.
Let’s look at some examples here, please refer to the mu-find and
mu-easy man pages for details and more examples.

  * Get all messages regarding bananas:
   
    bananas
    
  * Get all messages regarding bananas from John with an attachment:
   
    from:john flag:attach bananas
    
  * Get all messages with subject wombat in June 2009
   
    subject:wombat date:20090601..20090630
    
  * Get all messages with PDF attachments in the /projects folder
   
    maildir:/projects mime:application/pdf
    
  * Get all messages about Rupert in the /Sent Items folder. Note
    that maildirs with spaces must be quoted.
   
    maildir:"/Sent Items" rupert
    
  * Get all important messages which are signed:
   
    flag:signed prio:high
    
  * Get all messages from Jim without an attachment:
   
    from:jim AND NOT flag:attach
    
  * Get all messages with Alice in one of the contacts-fields (to,
    from, cc, bcc):
   
    contact:alice
    
  * Get all unread messages where the subject mentions Ångström:
    (search is case-insensitive and accent-insensitive, so this
    matches Ångström, angstrom, aNGstrøM, ...)
   
    subject:Ångström flag:unread
    
  * Get all unread messages between Mar-2002 and Aug-2003 about some
    bird:
   
    date:20020301..20030831 nightingale flag:unread
    
  * Get today’s messages:
   
    date:today..now
    
    or, unless you have a really old Xapian
   
    date:today
    
  * Get all messages we got in the last two weeks regarding emacs:
   
    date:2w..now emacs
    
    or, unless you have a really old Xapian
   
    date:2w.. emacs
    
  * Get messages from the Mu mailing list:
   
    list:mu-discuss.googlegroups.com
    
    Note - in the Headers view you may see the ’friendly name’ for a
    list; however, when searching you need the real name. You can see
    the real name for a mailing list from the friendly name’s
    tool-tip.
   
  * Get messages with a subject soccer, Socrates, society, ...; note
    that the ’*’-wildcard can only appear as a term’s rightmost
    character:
   
    subject:soc*
    
  * Get all messages not sent to a mailing-list:
   
    NOT flag:list
    
  * Get all mails with attachments with filenames starting with pic;
    note that the ’*’ wildcard can only appear as the term’s
    rightmost character:
   
    file:pic*
    
  * Get all messages with PDF-attachments:
   
    mime:application/pdf
    
    Get all messages with image attachments, and note that the ’*’
    wildcard can only appear as the term’s rightmost character:
   
    mime:image/*

使用过程中，我只遇到过一次，index不知道怎么被搞坏了。

1. 我先删了原来的index，应该是 ~/.mu 目录。
2. 然后使用 !mu index –maildir=~/mutt_mail! 来重新index。
3. 最后在mu4e中按 U 重新update一下就ok了。