Difference between revisions of "Registers"

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Emacs registers are compartments where you can save text, rectangles, positions, and other things for later use. Once you save text or a rectangle in a register, you can copy it into the buffer once, or many times; once you save a position in a register, you can jump back to that position once, or many times.
 
Emacs registers are compartments where you can save text, rectangles, positions, and other things for later use. Once you save text or a rectangle in a register, you can copy it into the buffer once, or many times; once you save a position in a register, you can jump back to that position once, or many times.
  
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Each register has a name that consists of a single character, which we will denote by r; r can be a letter (such as ‘a’) or a number (such as ‘1’); case matters, so register ‘a’ is not the same as register ‘A’.
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== Naming convention ==
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There are 62 registers, each with a single character for a name:
  
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A register can store a position, a piece of text, a rectangle, a number, a window configuration, or a file name, but only one thing at any given time. Whatever you store in a register remains there until you store something else in that register. To see what register r contains, use M-x view-register
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* from a to z
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* from A to Z, different from a to z
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* from 0 to 9
  
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== Functions ==
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A register can store a position, a piece of text, a rectangle, a number, a window configuration, or a file name, but only one thing at any given time. Whatever you store in a register remains there until you store something else in that register.
  
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* Position: Saving positions in registers.
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== How to use ==
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* Text: Saving text in registers.
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{| class="wikitable"
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* Rectangle: Saving rectangles in registers.
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|-
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* Configurations: Saving window configurations in registers.
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! Type
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* Numbers: Numbers in registers.
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! How to save
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* Files: File names in registers.
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! How to use
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* Bookmarks: Bookmarks are like registers, but persistent.
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! Other useful command
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|-
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|Position
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|C-x r <SPC> '''r'''
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|''jump:'' C-x r j '''r'''
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|
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|-
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|Text
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|C-x r s '''r'''
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|''insert:'' C-x r i '''r'''
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| m-x append-toregister <RET> '''r'''; m-x prepend-to-register <RET> '''r'''
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|-
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|Rectangle
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|C-x r r '''r'''
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|''insert:'' C-x r i '''r'''
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|
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|-
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|Window Config
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|C-x r w '''r'''
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|''restore:'' C-x r j '''r'''
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|''save all frame's window:'' C-x r f '''r'''
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|-
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|Number
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|C-u number C-x r n '''r'''
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|''insert:'' C-x r i '''r'''
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|''increment:'' C-x r + '''r'''
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|-
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| File
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| (set-register ?z '(fine . name))
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| ''jump:'' C-x r j '''r'''
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|
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|}
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* To see what register r contains, use M-x view-register
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* To visualize what register r contains with helm you can M-x [https://tuhdo.github.io/helm-intro.html#sec-19 helm-register]
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== Bookmark ==
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[[Bookmarks]] can be thought as register with a long name and surviving between Emacs session.
  
 
[[Category:Text Editing]]
 
[[Category:Text Editing]]

Latest revision as of 19:19, 1 November 2014

Emacs registers are compartments where you can save text, rectangles, positions, and other things for later use. Once you save text or a rectangle in a register, you can copy it into the buffer once, or many times; once you save a position in a register, you can jump back to that position once, or many times.

Naming convention

There are 62 registers, each with a single character for a name:

  • from a to z
  • from A to Z, different from a to z
  • from 0 to 9

Functions

A register can store a position, a piece of text, a rectangle, a number, a window configuration, or a file name, but only one thing at any given time. Whatever you store in a register remains there until you store something else in that register.

How to use

Type How to save How to use Other useful command
Position C-x r <SPC> r jump: C-x r j r
Text C-x r s r insert: C-x r i r m-x append-toregister <RET> r; m-x prepend-to-register <RET> r
Rectangle C-x r r r insert: C-x r i r
Window Config C-x r w r restore: C-x r j r save all frame's window: C-x r f r
Number C-u number C-x r n r insert: C-x r i r increment: C-x r + r
File (set-register ?z '(fine . name)) jump: C-x r j r
  • To see what register r contains, use M-x view-register
  • To visualize what register r contains with helm you can M-x helm-register

Bookmark

Bookmarks can be thought as register with a long name and surviving between Emacs session.

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