Difference between revisions of "Emacs (简体中文)"

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(提示和技巧)
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==提示和技巧==
 
==提示和技巧==
While the previous sections has given an overview of the basic editing commands available, it has not given an indication of the possibilities of Emacs.  This section will cover some more advanced techniques and functionality.
+
前面的部分给出了基本编辑命令的概述,没有给出Emacs的一个指示。这个部分讲述一些高级的技巧和功能。
  
 
===TRAMP===
 
===TRAMP===
TRAMP (Transparent Remote Access, Multiple Protocols) is an extension which, as its name suggests, provides transparent access to remote files across a number of protocols.  When prompted for a filename, entering a specific form will invoke TRAMP.  Some examples:
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TRAMP (Transparent Remote Access, Multiple Protocols) ,顾名思义,是一个可以通过很多协议透明访问远程文件的一个扩展。当提示输入一个文件名,输入特定的格式就可以使用TRAMPP。比如:
  
To prompt for the root password before opening /etc/hosts with root permissions:
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在打开/etc/hosts文件之前提示输入root的密码以获取root权限:
  
 
  C-x C-f /su::/etc/hosts
 
  C-x C-f /su::/etc/hosts
  
To connect to 'myhost' as 'myuser' via SSH and open the file ~/example.txt:
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要通过SSH使用'myuser'用户名登录'myhost'主机并打开文件~/example.txt:
  
 
  C-x C-f /ssh:myuser@myhost:~/example.txt
 
  C-x C-f /ssh:myuser@myhost:~/example.txt
  
The path for TRAMP is typically of the form '/[protocol]:[[user@]host]:<file>'.  TRAMP supports much more than the examples above might indicate.  For more information refer to the TRAMP info manual, which is distributed with Emacs.
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TRAMP的路径一般是这种格式'/[protocol]:[[user@]host]:<file>'。TRAMP支持的不只上面的两个简单例子。请查看Emacs里面的TRAMPP info手册了解更多的信息。
  
 
===键盘宏和寄存器===
 
===键盘宏和寄存器===
This section will provide a practical demonstration of the use of a couple of more powerful editing features.  Namely, ''keyboard macros'' and ''registers''.
+
这一部分会提供一个实用的指南来使用一些更强大的编辑特性。也就是“键盘宏”和“寄存器”。
 +
 
  
 
The aim will be to produce a listing of a series of characters and their corresponding position in this list.  While it is possible to format each of them by hand, this would be slow and error-prone.  Alternatively, some of Emacs' more powerful editing functionality could be leveraged.  Before describing a solution, some details behind the techniques which will be used follow.
 
The aim will be to produce a listing of a series of characters and their corresponding position in this list.  While it is possible to format each of them by hand, this would be slow and error-prone.  Alternatively, some of Emacs' more powerful editing functionality could be leveraged.  Before describing a solution, some details behind the techniques which will be used follow.

Revision as of 14:03, 8 April 2013

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Summary help replacing me
Tutorial on acquiring and using the Emacs text editor.

Emacs是一个扩展方便,定制能力强,文档丰富的动态交互编辑器。Emacs的核心构建在Emacs Lisp解释器之上,其中Emacs Lisp是大部分Emacs的内建函数和拓展模块的实现语言。Emacs可以在命令行界面下(CLI)工作良好,在图形界面系统下,使用GTK作为默认的图形界面构建工具。在文本编辑能力上,Emacs常常拿来和vim比较。

Note: 入门建议直接使用starterkit扩展。本文档实际帮助不大

安装

Emacs有众多变体发行版本(有时候称作emacsen). 最常见的莫过于 GNU Emacs,在Official Repositories可以找到

$ pacman -S emacs

另外一个常见的变体就是xemacs.

快速入门

一般印象是Emacs十分复杂,学习曲线陡峭,但很多资深学习者并不这样认为,反而认为其非常易懂和可定制。因为其源码和配置文件语义化程度较高。简单了解下自定义和高扩展带来的好处花不了多少时间。何况还有很多成熟的功能拓展模块,很方便添加,可以让Emacs为任何文本编辑的需求配置强大的环境。

Emacs自带一个入门教程,你可以点击欢迎界面上的第一个链接来打开它; 或者从菜单栏中选择Help->Emacs Tutorial,或者按'F1'键然后按't'. 我们设计这篇文章来为你在Emacs入门学习中提供额外的资源。

Emacs也包括一系列引用链接,既有适合初学者的内容,也有骨灰级玩家所喜爱的.参见/usr/share/emacs/<version>/etc/refcards/ (将<version>换成你的emacs版本).

运行Emacs

图形界面下打开方式

图形界面下可以直接点击图标打开。

虚拟终端下的常见方式

打开Emacs:

$ emacs

不打开图形界面,直接在终端中运行:

$ emacs -nw

也可以马上打开一篇文章:

$ emacs filename.txt
无色运行

默认的emacs会带有颜色主题,如果不需要,可以关闭之:

$ emacs -nw --color=no


作为守护进程

Emacs由于每次启动都需要加载大量自定义的配置文件,所以打开时候会有点慢。从Emacs23开始, Emacs可以以守护进程的形式运行,这样每个用户都可以链接到Emacs。以守护进程运行Emacs:

$ emacs --daemon

你可能在启动时打开一个守护进程,然后再将守护进程链接到窗口。另外,也可以将图形和终端客户端同时链接到守护进程上,这样启动图形界面速度就很快了。

如果你仅仅想链接到守护进程,用下面的命令(注意,在桌面环境下这个命令会打开一个图形客户端,而在像tty这种命令行下,它会打开一个命令行版的emacs):

$ emacsclient

如果你想在桌面环境下打开一个命令行版的emacs,使用下面的命令:

$ emacsclient -t

另外,你可以在后面加上 -a "" 参数. 现在,你第一次使用这个命令时,它会把emacs作为守护进程来启动,它会留在后台以加快以后的启动速度(也会记住缓冲区).

更聪明点,你可以在.bashrc中加上下面的别名:

$ alias e0='emacs --daemon'  #启动守护进程
$ alias e1='emacsclient -t -a ""'  #在终端中开启emacs
$ alias e2='emacsclient -c -a ""'  #启动emacs图形界面


xfce桌面环境中,如果你想使用 emacsclient -c 来代替 emacs %f 打开一个新文件, 你可以修改你的 /usr/share/applications/emacs.desktop 文件,把下面这一行

$ Exec=emacs %f

修改为

$ Exec=emacsclient -c

使用这种方法,每次你打开一个文件时就只会启动客户端,因此速度非常快!

基本术语和约定

Emacs使用一些刚开始看起来很奇怪的术语和约定,我们会在合适的时候介绍。但是,对于部分术语,我们必须要在前面介绍,因为它们对于使用Emacs来说是非常基础的。

第一个要介绍的术语是缓冲区的概念。一个缓冲区就是Emacs中的数据的一种表示方式,比如,当使用Emacs打开一个文件时,这个文件从磁盘中被读出来,它的内容被存储在了缓冲区里面,它的内容可以在这个缓冲区里面被编辑并且可以重新写进磁盘中。缓冲区中的内容不仅仅可以是文本,也可以是图片和widget。现在,让缓冲区可以显示应用程序的工作正在进行!换个角度思考,在磁盘中数据是以文件形式保存的,而在Emacs中,数据是以缓冲区的形式存在的。

在Emacs中,对于按键组合的约定你可能很陌生。比如:

C-x 代表 Control-x

M-x 代表 Meta-x

Note: 'Meta'一般代表Alt键,也可以用Esc键替代。

举个例子,退出Emacs使用下面的按键组合C-x C-c。这个可以读做,"按住Ctrol键再按'x',释放,再按住Control键再按'c'。虽然Emacs提供了一个菜单栏,但是强烈建议学习使用按键组合。这个指南将参考Emacs的按键绑定的约定。

移动

光标移动和其它图形编辑器非常类似,鼠标和方向键可以用来改变光标(在Emacs中称为)的位置。在Emacs中,方向键代表的标准移动命令也有其它辅助的绑定。向前(forward)移动一个字符,使用 C-f,向后(back)移动一个字符,使用C-bC-nC-p 分别用于移动到下(next)一行和移动到上(previous)一行。再声明一下,强烈推荐使用组合键而不是使用方向键和鼠标。

可以想像,Emacs提供了更多的光标高级移动命令,包括移动一个单词和一个句子。 M-f 表示光标向前移动一个单词, M-b 表示向后移动一个单词。类似地,M-e 把光标移动到一个句子的末尾(end), M-a 移动到句子的开头。

直到现在,所有的移动命令都是和光标有关的。M-< 表示把光标移动到缓冲区的开头,和它相反的是 M->, 把光标移动到缓冲区的末尾。要把光标移动到某一特定行,使用M-g g. M-g g 会提示输入行号。同样,要移动到一行的开头或者结尾,分别使用C-aC-e

Note: 这些命令(实际上是全部命令)的绑定,在不同的模式(mode)中,稍微会有不同。然而,覆盖的命令提供不同的功能这种情况很少见。更多信息请看Modes

文件和缓冲区

Emacs 提供了一系列命令来对文件操作,其中最常用的会在这里详细说明。C-x C-f 用来打开一个文件(在Emacs中叫做'查找文件')。如果指定的文件不存在,Emacs会打开一个空的缓冲区。保存一个缓冲区会创建一个包含缓冲区内容的文件。C-x C-s 就是用来保存缓冲区的。要保存一个文件名不一样的缓冲区,使用C-x C-w (这其实是'write-file'这条命令的助记符), 它会在写入磁盘之前提示输入新文件名。也可以使用C-x s来保存所有的缓冲区, 如果某个缓冲区在上次保存之后被修改了,则会提示进行哪项操作。

Note: 如果指向某个文件的缓冲区还在打开的话,C-x C-f 是不会重新从磁盘中读取文件的。要从磁盘中重新读取文件,先使用C-x k关掉缓冲区,再使用C-x C-f打开文件,或者使用M-x revert-buffer.

很多互动的命令,比如"find-file" 或者 "write-file" 会在Emacs窗口的底部栏提示输入。这栏称为minibuffer。和很多*nix shell一样,minibuffer支持很多基本的操作和TAB补全。按两下<TAB>可以显示一个补全的选项列表,并且,如果你喜欢,可以用鼠标从列表中选择。minibuffer的补全在很多输入(包括命令和文件名)中都可以用。

minibuffer也提供一个记住历史的特性。通过Up Arrow 或者 C-p可以取得这条命令的上一个条目.

要在任意时刻退出minibuffer,使用C-g.

打开几个文件后,切换缓冲区是非常必要的。打开一个指向那个缓冲区的文件可以切换到那个缓冲区。但是这不是最高效的方法。Emacs提供C-x b来提示要显示的新缓冲区(这里可以使用TAB补全)。输入一个不存在的缓冲区,则会新建一个空的缓冲区。

Note: 要切换到上一个缓冲区,使用C-x b <RET>, 因为上一个缓冲区是默认的缓冲区。

使用C-x C-b可以显示所有打开缓冲区的列表。如果某个缓冲区不需要使用了,使用C-x k来关掉它。

编辑

Emacs 内建有很多编辑命令。可能最重要的还没有介绍的是'undo',它的快捷键为 "C-_" 或者 "C-/" .移动光标的命令通常都有对应的删除字符的命令。例如, M-<backspace> 可以用来删除一个光标后的词,M-d可以用来删除光标前面的一个词。删除光标至行尾或者句尾的字符可以分别用C-k 或者 M-k

通常我们都约定一行不能超过80个字符。这是为了代码的可读性,尤其是一行中的字符可能会接触到窗口边缘。在Emacs,自动地插入或者删除换行符称为filling。我们可以用 M-q 重整当前的段落(重新分配换行符,删除段落中多余的空格和tab键)

Characters and words can be transposed using C-t and M-t, respectively. For example: Hello World!World! Hello

The case of words is also readily adjustable. M-l downcases a word from point (HELLOhello); M-u upcases a word from point (helloHELLO) and M-c capitalizes the first character of a word from point while downcasing the remainder (hElLoHello).

移除,召回和区域

A region is a section of text between two positions. One of those positions is referred to as mark, and the other is point. C-<SPC> is used to set the position of mark, after which point can be moved to create a region. Within GNU Emacs 23.1 onwards, this region is visible by default. There are a number of commands which act upon regions, among the most commonly used are killing commands.

In Emacs, cut and paste are referred to as kill and yank, respectively. Many commands which delete more than one character (including many of those in the above section, such as C-k and M-d) actually cut the text and append it to what is known as the kill-ring. The kill-ring is simply a list of killed text. The kill-ring stores up to the last 60 kills by default. Successive kills are concatenated and stored at the head of the list.

C-w and M-w can be used to kill and copy a region, respectively.

To insert killed text into a buffer (known as 'yanking'), use C-y. C-y can be used multiple times in succession to yank text repeatedly. As mentioned, previous kills are stored in a list, however C-y only retrieves the first of them. The earlier kills can be accessed via M-y. This will remove the text inserted by 'yank' initially, replacing it with the text killed earlier. M-y must be used immediately following C-y and can be used in many times succession to cycle through the kill-ring.

查找和替换

Searching for a string is common practise in text-editing. This can be performed using C-s (to search forward) or C-r (to search backward). These commands prompt for the string for which to search. Searching is performed incrementally, and so it will match the next (or previous) occurrence as you type. To move to the next or previous match, press C-s or C-r again, respectively. Once a match has been found, <RET> can be used to end the search. Alternatively, should you wish to return to the location you initiated the search, use C-g.

Once a search is completed (i.e., was not aborted with C-g or similar), the string which was searched for will be the default for any following search. To make use of this, press C-s C-s or C-r C-r to search forward or backward again, respectively.

Regular Expression searches behave identically to the searching described above except for the command to initiate the search. Use C-M-s or C-M-r to initiate a regexp search forward or backward, respectively. Once a Regular Expression search has commenced, C-s and C-r can be used to search forward or backward, just as with string searches.

In addition to searching, it is also possible to perform string and regular expression replacement (via M-% and C-M-%, respectively). Prompts are provided for both the initial and replacement text, and then another prompt for the action to perform on the highlighted match. Although many options are available (the full list is available by pressing ?), the most commonly used are y, to perform replacement, n, to skip this match, and ! to replace this, and all following matches.

缩进和前缀参数

Indentation is usually performed with either <TAB>, to indent a single line, or with C-M-\, to indent a region.

Exactly how text is indented usually depends on the major-mode which is active. Major-modes often define indentation styles specialising in indenting a certain type of text. (See Modes for more information.)

In some cases, a suitable major-mode may not exist for a file type, in which case, manual indentation may be necessary. Create a region (see Killing, yanking and regions) then perform indentation with C-u <n> C-x <TAB> (where '<n>' is the number of columns which the text within the region should be indented). For example:

Increase the region's indentation by four columns:

C-u 4 C-x <TAB>

Decrease the region's indentation by two columns.

C-u -2 C-x <TAB>
Note: The trick behind this is C-u, which corresponds to the 'universal-argument' command. Providing a 'universal-argument' is a way to provide more information to a command (this information is referred to as a 'prefix argument'). In this case, we provided the amount of indentation desired to the command invoked by C-x <TAB>. Without providing an argument, C-x <TAB> will only increase indentation by 1 column.

窗口和外框架

Emacs is designed for convenient editing of many files at a time. This is achieved by dividing the Emacs interface into three levels. Namely, buffers, which have already been introduced, as well as windows and frames.

A window is a viewport used for displaying a buffer. A window can display only one buffer at a time, however one buffer can be displayed in many windows. Beneath each window exists a mode-line, which displays information for that buffer.

A frame is an Emacs "window" (in standard terminology. i.e., 'window' in the sense of the modern desktop paradigm) which contains a title bar, menu bar and one or more 'windows' (in Emacs terminology. i.e., the above definition of 'window').

From now on the definition of these terms as they exist in Emacs will be used.

To split the window vertically or horizontally, use C-x 2 or C-x 3, respectively. This has the effect of creating another window in the current frame. To cycle between multiple windows, use C-x o.

The opposite of splitting a window, is deleting it. To delete the current window, use C-x 0 and C-x 1 to delete all windows except the current.

As with windows, it is also possible to create and delete frames. C-x 5 2 creates a frame. With C-x 5 0 to delete the current frame and C-x 5 1 to delete all except the current frame.

Note: These commands do not affect buffers. For example, deleting a window does not kill the buffer it displays.

获得帮助

Emacs在设计的时候就自文档化了。比如,要查看一个命令的名字或者它的键的绑定,Emacs提供了很多帮助信息。下面是列出来的最有用的一些帮助命令:

C-h t        启动Emacs官方教程

C-h b        列出来所有的有效键绑定

C-h k        查找一个键被绑定在了哪个命令上

C-h w        查找一个命令被绑定在了哪些键上

C-h a        查找一个匹配一段描述的命令

C-h m        显示当前激活的所有模式的信息

C-h f        显示给定函数的描述信息

模式

An Emacs mode is an extension written in Emacs Lisp that controls the behaviour of the buffer it is attached to. Usually it provides indentation, syntax highlighting and keybindings for editing that form of text. Sophisticated modes can turn Emacs into a full-fledged IDE (Integrated Development Environment). Emacs will generally use a file's extension to determine which mode should be loaded.

Useful modes for editing shell scripts are sh-mode, line-number-mode and column-number-mode. They can be used in parallel and are invoked by:

M-x sh-mode <RET>

M-x column-number-mode <RET>

line-number-mode is enabled by default, though, it can be toggled on/off by issuing the command again:

M-x line-number-mode <RET>

sh-mode is a major-mode. Major-modes adjust Emacs, and often also provide a specialised set of commands, for editing a particular type of text. Only one major-mode can be active in each buffer. In addition to syntax highlighting, and indentation support, sh-mode defines several commands to help write shell scripts. The following shows a few of those commands:

C-c (	 Insert a function definition

C-c C-f	 Insert a 'for' loop

C-c TAB	 Insert an 'if' statement

C-c C-w	 Insert a 'while' loop

C-c C-l	 Insert an indexed loop from 1 to n

'line-number-mode' and 'column-number-mode', are minor-modes. Minor-modes can be used to extend a major-mode and any number of minor-modes can be enabled at once.

提示和技巧

前面的部分给出了基本编辑命令的概述,没有给出Emacs的一个指示。这个部分讲述一些高级的技巧和功能。

TRAMP

TRAMP (Transparent Remote Access, Multiple Protocols) ,顾名思义,是一个可以通过很多协议透明访问远程文件的一个扩展。当提示输入一个文件名,输入特定的格式就可以使用TRAMPP。比如:

在打开/etc/hosts文件之前提示输入root的密码以获取root权限:

C-x C-f /su::/etc/hosts

要通过SSH使用'myuser'用户名登录'myhost'主机并打开文件~/example.txt:

C-x C-f /ssh:myuser@myhost:~/example.txt

TRAMP的路径一般是这种格式'/[protocol]:[[user@]host]:<file>'。TRAMP支持的不只上面的两个简单例子。请查看Emacs里面的TRAMPP info手册了解更多的信息。

键盘宏和寄存器

这一部分会提供一个实用的指南来使用一些更强大的编辑特性。也就是“键盘宏”和“寄存器”。


The aim will be to produce a listing of a series of characters and their corresponding position in this list. While it is possible to format each of them by hand, this would be slow and error-prone. Alternatively, some of Emacs' more powerful editing functionality could be leveraged. Before describing a solution, some details behind the techniques which will be used follow.

The first feature which will be introduced is registers. Registers are used to store and retrieve a variety of data types ranging from numbers to window configurations. Each register is given a name of a single character: this character is used to access the register.

The other which will be demonstrated is keyboard macros. A keyboard macro stores a sequence of commands so they can be easily repeated later. These changes will now be performed step-by-step.

Starting with a buffer containing our set of characters:

ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz

Prepare a register by invoking the `number-to-register' command (C-x r n) then storing the number '0' in register 'k':

C-x r n k

With point at the beginning of the buffer, start a keyboard macro (C-x () and begin to format the characters:

C-x ( C-f M-4 .

Insert (C-x r i) and increment (C-x r +) the register 'k'. The prefix argument (C-u) is used to leave point positioned after the inserted text:

C-u C-x r i k C-x r + k

Complete the formatting by inserting a newline. Emacs can then repeat that process, beginning from the point where we started defining the keyboard macro, for the rest of the characters. C-x e completes then invokes the keyboard macro. The prefix argument, M-0, causes the macro to repeat until it comes across an error. In this case it aborts once it reaches the end of the buffer.

<RET> M-0 C-x e

The result:

 A....0
 B....1
 C....2
 [...]
 x....49
 y....50
 z....51

正则表达式

From the Emacs Manual: "A regular expression, or regexp for short, is a pattern that denotes a (possibly infinite) set of strings." This section will not go into any detail regarding regular expressions themselves (as there is simply too much to cover). It will however provide a quick demonstration of their power. See Regular Expressions section in the Emacs Manual for further reading.

Given the same scenario presented above: A list of characters which are to be formatted to represent their respective position in the list. (see Keyboard macros and registers). Again, starting with a buffer containing.

ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz

At the beginning of the buffer, use C-M-% (if the key-sequence is difficult to perform, it may be more comfortable to use M-x query-replace-regexp). At the prompt:

\(.\)

which simply matches one character. Then, when prompted for the replacement:

\1....\#^J
Note: '^J' represents where a newline should be placed, it should not be entered into the prompt. The newline must instead be inserted literally using C-q C-j.

The replacement expression reads: "Insert the matched text between the first set of parentheses (in this case, a single character), followed by 4 periods then insert an automatically incremented number followed by a newline.

Finally, press ! to apply this across the entire buffer. All of the formatting that was performed in the previous section was performed with a single regexp replacement.

定制

Emacs can configured by editing '~/.emacs' or using M-x customize. This section will focus on editing ~/.emacs by hand, and provide some example customizations to demonstrate commonly-configured aspects of Emacs. The customize command provides a simple interface to make adjustments, though it may become restricting as you grow more familiar with Emacs.

All of the examples here can be performed while Emacs is running. To evaluate the expression within Emacs, use:

C-M-x with point anywhere within the expression.

or

C-x C-e with point following the last ')'

For some users, typing 'yes' and 'no' in prompts can quickly become tiring. To instead use the 'y' and 'n' keys at these prompts:

(defalias 'yes-or-no-p 'y-or-n-p)

To stop the cursor blinking, use:

(blink-cursor-mode -1)

Similarly, to enable column-number-mode, as discussed in the previous section:

(column-number-mode 1)

The similarities between the previous two commands are not a coincidence: blink-cursor-mode and column-number-mode are both minor-modes. As a rule, minor-modes can be enabled given positive argument or disabled with a negative argument. Should the argument be omitted, the minor-mode will be toggled on/off.

Here are some more examples of minor-modes. The following will disable the scroll bars, menu-bar and tool-bar, respectively.

(scroll-bar-mode -1)
(menu-bar-mode -1)
(tool-bar-mode -1)

The variable, 'auto-mode-alist', can be modified to change the major-mode used by default for certain file names. The following example will make the default major-mode for '.tut' and '.req' files 'text-mode'.

(setq auto-mode-alist
  (append
    '(("\\.tut$" . text-mode)
      ("\\.req$" . text-mode))
    auto-mode-alist))

Settings can also be applied on a per-mode basis. A common method for this is to add a function to a hook. For example, to force indentation to use spaces instead of tabs, but only in text-mode:

(add-hook 'text-mode-hook (lambda () (setq indent-tabs-mode nil)))

Similarly, to only use spaces for indentation everywhere:

(setq-default indent-tabs-mode nil)

Keybindings can be adjusted in two ways. The first of which is 'define-key'. 'define-key' creates a keybinding for a command but only in one mode. The example below will make F8 delete any whitespace from the end of each line of a 'text-mode' buffer:

(define-key text-mode-map (kbd "<f8>") 'delete-trailing-whitespace)

The other method is 'global-set-key'. This is used to bind a key to a command everywhere. To bind 'query-replace-regexp' (C-M-%) to '<f7>'.

(global-set-key (kbd "<f7>") 'query-replace-regexp)

Binding a command to an alternate key does not replace any existing bindings. Which is to say, 'query-replace-regexp' would be bound to both F7 and C-M-% after the above example.

Almost anything within Emacs can be configured. Browsing through the Emacs Wiki should give a solid place to start.

拓展模块

While Emacs includes hundreds of modes, libraries and other extensions, there are many more available to further Emacs' capabilities. The majority of these come with instructions detailing any changes needed to be made to ~/.emacs. These instructions are generally found in the comment block at the beginning of an elisp source file, or in a README (or similar) should the extension consist of multiple source files.

A number of popular extensions are available as packages in the 'community' repository, and more still are available via the AUR. The name of such packages have a 'emacs-' prefix (for example, emacs-lua-mode). In many cases, the changes which need to be made to ~/.emacs are shown during the installation of the package.

Should instructions describing how to activate a specific extension not be available in the aforementioned location(s), check for a corresponding page in the Emacs Wiki, which will almost certainly provide an example configuration. The Emacs Wiki is also an excellent resource for discovering even more extensions.

You can also use the Emacs Lisp Package Archive (ELPA) to automatically install packages. See the website for instructions. ELPA is included with Emacs 24 (the newest version of Emacs); it is an accepted part of the Emacs ecosystem.

疑难杂症

彩色输出的问题

Emacs默认使用原生的转义串来输出颜色。也就是说,它会在要显示颜色的地方显示奇怪的字符。

~/.emacs中加入下面的代码解决这个问题:

(add-hook 'shell-mode-hook 'ansi-color-for-comint-mode-on)

菜单显示为空

一些菜单显示为空,这是GNU Emacs 23.1的一个bug(使用GTK toolkit的时候)。好像在Emacs的CVS trunk中已经修复了。对应的Debian bug report 有一个应对措施。

X 窗口下的字符显示问题

当你使用X窗口启动emacs时,如果发现主窗口中的所有字符都是黑框白块(就像你没有安装正确的字体看到的字符一样),那么你需要安装 xorg-fonts-75dpi 或者 xorg-fonts-100dpi 并且重启X窗口。

启动速度慢

启动速度慢经常是由下面两种情况引起的。

要确定是哪种情况,这样打开Emacs:

$ emacs -q

如果Emacs还是启动很慢,则是错误的网络配置。如果不是,则可以确定是.emacs的问题

错误的网络配置

当启动Emacs的时候,一些错误,特别是在/etc/hosts中的,经常会导致5秒以上的延迟。在网络配置指南中查看'set the hostname' 了解更多内容。

初始化文件加载慢

一个很简单的方法查找原因是注释掉(比如在行开头使用';')你的~/.emacs(或者~/.emacs.d/init.el)里面可疑的地方,然后再启动Emacs,看速度是否有改善。记住,使用"require"和"load"会减慢启动速度,特别是用在很大的插件上。一般来说,他们应该用在当目标是Emacs启动的时候就需要或者提供仅仅是一个扩展的"autoloads"。否则,直接使用'autoload'函数。比如,不是这样:

(require 'anything)

你应该这样:

(autoload 'anything "anything" "Select anything" t)

不能打开文件: ...

这个错误最常见的原因是'load-path'变量没有包含某些插件的目录。要解决这个问题,在加载插件前,把需要加载的插件目录加入到要搜索的list中:

 (add-to-list 'load-path "/path/to/directory/")

当尝试使用一个插件的包,而这个包又被Emacs加上了非'/usr'的前缀时,load-path需要更新。把下面的代码放到使用这个插件的包的代码的前面:

 (add-to-list 'load-path "/usr/share/emacs/site-lisp")

如果手动编译Emacs,记住默认的前缀是'/usr/local'。

替代方案

有很多Emacs的实现。GNU/Emacs 可能是最受欢迎的了。
更轻量的兼容性较好的Emacs可以在Arch仓库或在AUR中找到。

mg

mg(原来叫MicroGnuEmacs),是用C语言实现的轻量级Emacs。

可以从{{ic|community}中安装mg

# pacman -S mg

或者从官方网站page中下载源代码。

zile

引用官方网站page的描述,"GNU Zile is a lightweight Emacs clone. Zile is short for Zile Is Lossy Emacs. Zile has been written to be as similar as possible to Emacs; every Emacs user should feel at home.".

zile 可以在extra中找到

# pacman -S zile

最新的taball可以在GNU的官方源mirrors中找到。

uemacs

uemacs 是 "Micro-emacs version customized by Linus Torvalds". 它可以在 AURuemacs中找到。

资源