Difference between revisions of "Navigation"

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(Undo revision 1992 by GregLucas (talk))
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== Navigating Text Buffers ==
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The result of dtlcruteivesy modifying literal data like  (A B C) is undefined. Don't do it.In most of the cases when you think you need to push something on the end of a list, you actually don't; PUSH+NREVERSE is often more suitable. When you really do need to push things on the end of a list, keeping a pointer to the tail of the list is handy.Counting instructions to see how you're doing is a little premature at this point.
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For navigating a buffer while editing text use the following.
 
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{| class="wikitable"
 
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|+ Key bindings for navigating text
 
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|-
 
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! Entity % Movement
 
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! Begin (Backward)
 
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! End (Forward)
 
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! Mark
 
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! Kill Or Cut
 
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|-
 
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!Character
 
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| {{Keys | C-b}}
 
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| {{Keys | C-f}}
 
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| {{Keys | C-@}}
 
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| {{Keys | C-d}}
 
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|-
 
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!Word
 
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| {{Keys | M-b}}
 
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| {{Keys | M-f}}
 
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| {{Keys | M-@}}
 
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| {{Keys | M-d}}
 
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|-
 
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!Line
 
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| {{Keys | C-a}}
 
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| {{Keys | C-e}}
 
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|
 
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| {{Keys | C-k}}
 
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|-
 
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!Sentence
 
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| {{Keys | M-a}}
 
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| {{Keys | M-e}}
 
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|
 
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| {{Keys | M-k}}
 
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|-
 
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! Paragraph
 
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| {{Keys | M-{ }}
 
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| {{Keys | M-} }}
 
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| {{Keys | M-h }}
 
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| {{Keys | {{Keys | M-h C-w}}
 
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|-
 
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! Page
 
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| {{Keys | C-x [ }}
 
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| {{Keys | C-x ] }}
 
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| {{Keys | C-x C-p}}
 
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|
 
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|}
 
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=== Notes ===
 
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; Sentence : By default Emacs expects two spaces between sentences. If you prefer to use a single space try {{CustomizeVariable|sentence-end-double-space}}.
 
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; Paragraph : By default Emacs expects a blank line between paragraphs.
 
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; Page : In "*.el" files and other text files (for example the <tt>NEWS</tt> file, {{Keys|C-h n}}), text is divided into "pages" delimited by `^L' character. This character can be entered with {{Keys|C-q C-l}}
 
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== Navigating Source Code ==
 
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For navigating source code (see [[:Category:Programming languages|Programming languages]]) use the following.
 
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{| class="wikitable"
 
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|+ Key bindings for navigating code
 
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|-
 
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! Entity % Movement
 
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! Begin (Backward)
 
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! End (Forward)
 
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! Mark
 
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! Kill Or Cut
 
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! Up
 
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|-
 
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! sexp
 
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| {{Keys | C-M-b}}
 
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| {{Keys | C-M-f}}
 
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| {{Keys | C-M-@}}
 
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| {{Keys | C-M-k}}
 
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| {{Keys | C-M-u}}
 
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|-
 
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! defun
 
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| {{Keys | C-M-a}}
 
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| {{Keys | C-M-e}}
 
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| {{Keys | C-M-h}}
 
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| {{Keys | C-M-h C-w}}
 
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|
 
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|-
 
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|}
 
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=== Notes ===
 
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; sexp
 
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: These are balanced expressions. For example, in [[C]] a block enclosed in a pair of '''{''','''}''' and in [[:Category:Lisp|Lisp]] a pair of '''(''', ''')'''.
 
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; defun
 
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: A Lisp function definition.
 
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; subword : The use of <tt>CamelCaseIdentifiers</tt> is common in some programming languages. You can enable {{ModeLink|subword-mode}} to use the standard word-based commands such as {{Keys|M-f}} and {{Keys|M-b}} to navigate subwords delimited by capital letters.  
 
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[[Category:Beginner]]
 

Revision as of 06:51, 23 June 2012

The result of dtlcruteivesy modifying literal data like (A B C) is undefined. Don't do it.In most of the cases when you think you need to push something on the end of a list, you actually don't; PUSH+NREVERSE is often more suitable. When you really do need to push things on the end of a list, keeping a pointer to the tail of the list is handy.Counting instructions to see how you're doing is a little premature at this point.

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