116 lines
3.4 KiB
Plaintext
116 lines
3.4 KiB
Plaintext
= Registers
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== Description
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Registers are named lists of text -instead of simply text- in order to interact
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well with multiselection. They are used for various purposes, like storing
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yanked text, the locations of selections in a buffer, or groups captured by a
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regular expression.
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== Interacting
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*<c-r><c>*::
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when in insert mode or in a prompt, insert the value stored in the
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*c* register (single character)
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*"<c>*::
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in normal mode, select the *<c>* register (single character)
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== Alternate names
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Non alphanumeric registers have an alternative name that can be used
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in contexts where only alphanumeric identifiers are possible.
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== Default registers
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All normal-mode commands using a register default to a specific one if not specified:
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*"* (dquote)::
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default delete / copy / paste / replace register, used by:
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*c*, *d*, *y*, *p*, *<a-p>*, *<P>*, *<a-P>*, *R* and *<a-R>*
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(see <<keys#changes, `:doc keys changes`>>)
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*/* (slash)::
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default search / regex register, used by:
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*/*, *<a-/>*, *?*, *<a-?>*, *n*, *<a-n>*, *N*, *<a-N>*, ***, *<a-*>*,
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*s*, *S*, *<a-k>* and *<a-K>*
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(see <<keys#searching, `:doc keys searching`>>)
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*@* (arobase)::
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default macro register, used by:
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*q* and *Q*
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(see <<keys#macros, `:doc keys macros`>>)
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*^* (caret)::
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default mark register, used by:
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*z*, *<a-z>*, *Z* and *<a-Z>*
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(see <<keys#marks, `:doc keys marks`>>
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and <<registers#marks, `:doc registers marks`>>)
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*|* (pipe)::
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default shell command register, used by commands that spawn a subshell:
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*|*, *<a-|>*, *!* and *<a-!>*
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(see <<keys#changes-through-external-programs, `:doc keys changes-through-external-programs`>>)
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== Special registers
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Some registers are not general purposes, they cannot be written to, but they
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contain some special data
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*%* (percent)::
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current buffer name
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*.* (dot)::
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current selection contents
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*#* (hash)::
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selection indices (first selection has 1, second has 2, ...)
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*_* (underscore)::
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null register, always empty
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*:* (colon)::
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last entered command
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== Integer registers
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Registers *1* to *9* hold the grouped sub-matches of the regular
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expression used to make the last selection. Example: applying the
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following regular expression to the date of the day would put the day of
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the week in register *1*, the month in register *2*, and the day of the
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month in register *3*, but select the entire date:
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--------------------
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(\w+) (\w+) (\d+) .+
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--------------------
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== Marks
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When a register is used to store a set of selections with the *Z* key (see
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<<keys#marks, `:doc keys marks`>>), the selections are stored as a list of
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spans, in a format similar to `%val{selections_desc}` (see
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<<expansions#value-expansions, `:doc expansions value-expansions`). However,
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the very first item of the list is of the form:
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---------------------
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/path/to/file@123@456
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---------------------
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...where:
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/path/to/file::
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represents the filesystem path of the file where the selections were saved,
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like `%val{buffile}`.
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123::
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represents the value of `%val{timestamp}` when the selections were saved,
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so the selections can still be restored after the buffer has been modified,
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or modifications undone.
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456::
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indicates which was the main selection, when the selections were saved
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(zero-based).
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You can examine the content of a mark register by using `<a-p>` to paste it,
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so you can see all its items, not limited to the current number of selections.
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