462 lines
23 KiB
Plaintext
462 lines
23 KiB
Plaintext
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*paredit.txt* Paredit Last Change: 13 Dec 2016
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Paredit Mode for Vim *paredit* *slimv-paredit*
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Version 0.9.13
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The paredit.vim plugin performs structured editing of s-expressions used in
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the Lisp, Clojure, Scheme programming languages. It may come as part of Slimv
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but it is also distributed separately as a standalone plugin.
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|paredit-mode| Paredit mode
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|paredit-keys| Paredit keybindings
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|paredit-options| Paredit options
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===============================================================================
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PAREDIT MODE *paredit-mode*
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Paredit mode is a special editing mode that keeps all matched characters
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(parentheses, square and curly braces, double quotes) balanced, i.e. all opening
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characters have a matching closing character. Most text entering and erasing
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commands try to maintain the balanced state, so no single matched character is
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added or deleted, they are entered or removed in pairs.
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The function takes care of strings and comments, so no parenthesis and square
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bracket balancing is performed inside a string or comment.
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Please note that [] and {} pairs are not balanced for Lisp filetypes, only
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for Clojure and Scheme.
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The idea is taken from the paredit mode of Emacs, but not all paredit.el
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editing functions are implemented or behave exactly the same way as they do
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in Emacs.
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When you enter a '(' then a matching ')' is automatically inserted.
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If needed, spaces before and/or after the '()' pair are added.
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When you press ')' in insert mode then there's no need to insert a closing
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parenthesis mark (it is already there), so the cursor is simply advanced past
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the next closing parenthesis (then the next outer closing parenthesis, etc.).
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The result of this is however that when entering text with paredit mode
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you can use the same keystrokes as without paredit mode and you get the same
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result. Of course you can choose to not enter the closing parenthesis (as
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required without paredit mode), because it is already there.
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When you are trying to delete a ')' alone then it is not possible, the cursor
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is simply moved inside the list, where all regular characters can be deleted.
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When the list is finally empty: '()', then the deletion of the opening '('
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makes both parentheses erased at once, so the balanced state is maintained.
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All the above holds for [...] and "..." character pairs.
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When you are deleting multiple characters at once, e.g. deleting a whole line,
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or deleting till the end of the line, etc, then the deletion logic of a single
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character is iterated. This means that the whole line or the characters till
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the end of the line, etc are not necessarily deleted all. Depending on the
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number of open/close parentheses, square or curly braces, double quotes some
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of them might be kept in order to maintain the balanced state.
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For example if you press D in Normal mode to delete till the end of line
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between the a and b parameters of the following Clojure function definition:
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(defn myfunc [a b c] (+ a b c))
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^--- press D here
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then the closing ] as well as the last closing ) will not be deleted, because
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in the list you have an ( and a [ to be matched, so the result will be:
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(defn myfunc [a])
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If you are deleting multiple lines, then the above process is performed for
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all lines involved. If a line was not completely cleared, then it is joined
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with the next line and the process continues.
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Of course not all Vim commands are compatible with the paredit mode (e.g.
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you can yank and paste unbalanced code snippet, or comment out an asymmetrical
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part of the code), and there is also the possibility to edit the source code
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with paredit mode switched off or with another editor to make it unbalanced.
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When paredit mode detects that the underlying code is not balanced, then the
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paredit functionality is suspended until the top level form balance is fixed.
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As soon as all parens are matched, the paredit mode is automatically resumed.
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Paredit needs "syntax on" to identify the syntax elements of the underlying
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code, so if syntax is switched off, then paredit will not be suspended inside
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comments or strings.
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Slurpage and Barfage known from Emacs is also possible but in a different
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fashion: you don't move the symbols but move the opening or closing parenthesis
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over the symbol or a sub-list. This way you can move any symbol or sub-list
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into or out of the current list. It is not possible to move the parenthesis
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over its pair, so for example if you move the opening parenthesis to the right,
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then it will stop at the matched closing parenthesis.
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Paredit mode is set by default for .lisp, .cl, .clj, cljs, .scm and .rkt files,
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but it is possible to switch it off by putting the following statement in the
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.vimrc file:
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let g:paredit_mode = 0
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You can enable paredit mode for other file types as well. Here is how to set
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it for Arc files in your .vimrc (assuming you have a filetype 'arc' defined):
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au FileType arc call PareditInitBuffer()
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Paredit is part of Slimv, but it is also distributed separately as a standalone
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plugin. If you indend to use the SWANK client and/or Slimv's indentation and
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syntax functions, then please install the Slimv plugin. Otherwise you may want
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to install the Paredit plugin thus omitting other unnecessary files.
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===============================================================================
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PAREDIT KEYBINDINGS *paredit-keys*
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Here follows a list of paredit keybindings:
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Insert Mode:
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( Inserts '()' and moves the cursor inside. Also adds leading
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or trailing spaces when needed.
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Inserts '(' when inside comment or string.
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) Moves the cursor to the next closing parenthesis mark of
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the current list. When pressed again then moves to the next
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outer closing parenthesis, etc, until the closing of the
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top level form is reached.
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Inserts ')' when inside comment or string.
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If |g:paredit_electric_return| is on then it also re-gathers
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electric returns when appropriate.
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[ Inserts '[]' and moves the cursor inside. Also adds leading
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or trailing spaces when needed.
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Inserts '[' when inside comment or string.
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] Moves the cursor to the next closing square bracket of the
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current list. When pressed again then moves to the next
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outer closing square bracket, etc, until the closing of the
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top level form is reached.
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Inserts ']' when inside comment or string.
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If |g:paredit_electric_return| is on then it also re-gathers
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electric returns when appropriate.
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{ Inserts '{}' and moves the cursor inside. Also adds leading
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or trailing spaces when needed.
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Inserts '{' when inside comment or string.
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} Moves the cursor to the next closing curly brace of the
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current list. When pressed again then moves to the next
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outer closing curly brace, etc, until the closing of the
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top level form is reached.
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Inserts '}' when inside comment or string.
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If |g:paredit_electric_return| is on then it also re-gathers
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electric returns when appropriate.
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" When outside of string, inserts '""' and moves the cursor
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inside. When inside string then moves to the closing '"'.
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Inserts '"' when inside comment. Also insert '"' when inside
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string and preceded by a '\'.
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<BS> When about to delete a (, ), [, ], or " and there are other
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characters inside, then just skip it to the left. When
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about to delete the opening part of the matched character
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with nothing inside, then the whole empty list is removed.
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<Del> When about to delete a (, ), [, ], or " and there are other
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characters inside, then just skip it to the right. When
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about to delete the closing part of the matched character
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with nothing inside, then the whole empty list is removed.
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<Enter> If |g:paredit_electric_return| is on then insert an
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"electric return", i.e. create an empty line by inserting
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two newline characters.
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Normal Mode:
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( Finds opening '(' of the current list. Can be pressed
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repeatedly until the opening of the top level form reached.
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) Finds closing ')' of the current list. Can be pressed
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repeatedly until the closing of the top level form reached.
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[[ Go to the start of current/previous defun.
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]] Go to the start of next defun.
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<Leader>< If standing on a delimiter (parenthesis or square bracket)
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then moves it to the left by slurping or barfing the
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s-expression to the left, depending on the direction of the
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delimiter:
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Pressing '<' when standing on a ')' makes the s-expression
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to the left of the ')' going out of the current list.
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Pressing '<' when standing on a '(' makes the s-expression
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to the left of the '(' coming into the current list.
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For example pressing <Leader>< at position marked with |:
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(aaa bbb|) ---> (aaa|) bbb
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aaa |(bbb) ---> |(aaa bbb)
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<Leader>> If standing on a delimiter (parenthesis or square bracket)
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then moves it to the right by slurping or barfing the
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s-expression to the right, depending on the direction of the
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delimiter:
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Pressing '>' when standing on a '(' makes the s-expression
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to the right of the '(' going out of the current list.
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Pressing '>' when standing on a ')' makes the s-expression
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to the right of the ')' coming into the current list.
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For example pressing <Leader>< at position marked with |:
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(aaa|) bbb ---> (aaa bbb|)
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|(aaa bbb) ---> aaa |(bbb)
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<Leader>J Join two subsequent lists or strings. The first one must end
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before the cursor, the second one must start after the
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cursor position.
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For example pressing <Leader>J at position marked with |:
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(aaa)| (bbb) ---> (aaa |bbb)
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"aaa"| "bbb" ---> "aaa |bbb"
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<Leader>O Split ("Open") current list or string at the cursor position.
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Opposite of Join. Key O is selected because for the original
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Vim mapping J and O are also kind of opposites.
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For example pressing <Leader>O at position marked with |:
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(aaa |bbb) ---> (aaa) |(bbb)
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"aaa|bbb" ---> "aaa" |"bbb"
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<Leader>W Wrap the current symbol in a pair of parentheses. The cursor
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<Leader>w( is then positioned on the opening parenthesis, as wrapping
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is usually done because one wants to call a function with
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the symbol as parameter, so by pressing "a" one can enter
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the function name right after the newly inserted "(".
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For example pressing <Leader>W at position marked with |:
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(aaa b|bb ccc) ---> (aaa |(bbb) ccc)
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<Leader>w[ Wrap the current symbol in a pair of square brackets,
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similarly to <Leader>W.
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For example pressing <Leader>w[ at position marked with |:
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(aaa b|bb ccc) ---> (aaa |[bbb] ccc)
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<Leader>w{ Wrap the current symbol in a pair of curly braces,
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similarly to <Leader>W.
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For example pressing <Leader>w{ at position marked with |:
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(aaa b|bb ccc) ---> (aaa |{bbb} ccc)
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<Leader>w" Wrap the current symbol in a pair of double quotes,
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similarly to <Leader>W.
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For example pressing <Leader>w" at position marked with |:
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(aaa b|bb ccc) ---> (aaa "bbb|" ccc)
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<Leader>S Splice the current list into the containing list, i.e.
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remove the opening and closing parens. Opposite of wrap.
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For example pressing <Leader>S at position marked with |:
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(aaa (b|bb ccc) ddd) ---> (aaa |bbb ccc ddd)
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<Leader><Up> Splice the current list into the containing list by deleting
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everything backward from the cursor position up to the
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opening paren.
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For example pressing <Leader><Up> at position marked with |:
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(aaa (bbb |ccc) ddd) ---> (aaa |ccc ddd)
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<Leader><Down> Splice the current list into the containing list by deleting
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everything forward from the cursor position up to the
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closing paren.
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For example pressing <Leader><Down> at position marked with |:
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(aaa (bbb| ccc) ddd) ---> (aaa |bbb ddd)
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<Leader>I Raise the current symbol, i.e. replace the current list with
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the current symbol by deleting everything else (except the
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symbol) in the list, including the enclosing pair of parens.
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For example pressing <Leader>I at position marked with |:
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(aaa (b|bb ccc) ddd) ---> (aaa |bbb ddd)
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x or <Del> When about to delete a (, ), [, ], or " and there are other
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characters inside, then just skip it to the right. When
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about to delete the closing part of the matched character
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with nothing inside, then the whole empty list is removed.
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When preceded by a <count> value then delete this many
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characters.
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X When about to delete a (, ), [, ], or " and there are other
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characters inside, then just skip it to the left. When
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about to delete the opening part of the matched character
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with nothing inside, then the whole empty list is removed.
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D Keep deleting characters towards the end of line,
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maintaining the balanced state, i.e. keep the number of
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opening and closing parens the same.
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C Same as 'D' but go to insert mode at the end.
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s Same as 'x' but go to insert mode at the end.
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dd Delete whole line by keeping the balanced state, i.e.
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keep the number of opening and closing parens the same.
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When preceded by a <count> value then delete this many
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lines.
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cc Same as 'dd' but go to insert mode at the end.
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d{motion} Delete text till {motion}. Keeps text balanced, so if the
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surrounded text contains unpaired matched characters then
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they are not removed.
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c{motion} Delete text till {motion} and start insert mode. Keeps text
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balanced just like d{motion}.
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p Put the text after the cursor with all unbalanced matched
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characters removed.
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P Put the text before the cursor with all unbalanced matched
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characters removed.
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Visual Mode:
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( Finds opening '(' of the current list and selects the whole
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list. Can be pressed repeatedly until the top level form
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selected.
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) Finds closing ')' of the current list and selects the whole
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list. Can be pressed repeatedly until the top level form
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selected.
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d Delete the current visual selection. Keeps text balanced,
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x so the the selection contains unpaired matched characters
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<Del> then they are not removed.
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c Delete the current visual selection and start insert mode.
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Keeps text balanced just like the 'd' command.
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<Leader>W Wrap the current visual selection in a pair of parentheses.
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<Leader>w( The visual selection is kept.
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<Leader>w[ Wrap the current visual selection in a pair of square
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brackets. The visual selection is kept.
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<Leader>w{ Wrap the current visual selection in a pair of curly braces.
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The visual selection is kept.
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<Leader>w" Wrap the current visual selection in a pair of double
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quotes. The visual selection is kept.
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Please note that if variable |g:paredit_shortmaps| is nonzero then the
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following normal mode mappings don't get a <Leader> prefix, they are mapped
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to existing (but infrequently used) Vim functions and instead the original Vim
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functions are mapped with the <Leader> prefix:
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<, >, J, O, W, S
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Vim has many built-in mappings for manipulating s-expressions. Here follows a
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list of useful commands, these are not defined by paredit.vim, they are
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available even when paredit mode is switched off.
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% Find the matching pair of the parenthesis the cursor is
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standing on.
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d% Delete till the matching parenthesis. Normally it is used
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when the cursor is standing on a parenthesis (works with
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square or curly braces as well). If not standing on a
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parenthesis then deletes left till the first opening paren,
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so this command may also be used to delete an s-expression
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that is right before the cursor.
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daw Delete a word. Can be used to delete a list element, the
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cursor may be placed anywhere in the element.
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da( Delete the innermost s-expression. The cursor may be placed
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anywhere inside the s-expression.
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di( Same as da( but does not delete the enclosing parens.
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Davide Taviani made a cheetsheet for Paredit, which can be accessed here:
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https://github.com/StudyFlow/paredit.vim-cheatsheet
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===============================================================================
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PAREDIT OPTIONS *paredit-options*
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|g:paredit_disable_clojure| If defined, paredit is disabled for clojure files.
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|g:paredit_disable_hy| If defined, paredit is disabled for hy files.
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|g:paredit_disable_lisp| If defined, paredit is disabled for lisp files.
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|g:paredit_disable_scheme| If defined, paredit is disabled for scheme files.
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|g:paredit_disable_shen| If defined, paredit is disabled for shen files.
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|g:paredit_electric_return| If nonzero, electric return feature is enabled.
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|g:paredit_smartjump| If nonzero, '(' and ')' also target square brackets
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and curly braces when editing Clojure or Scheme.
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|g:paredit_leader| Custom <Leader> setting for Paredit.
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|g:paredit_matchlines| Number of lines to look backward and forward
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when checking if the current form is balanced.
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|g:paredit_mode| If nonzero, paredit mode is switched on.
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|g:paredit_shortmaps| If nonzero, paredit is remapping some one-letter
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Vim commands that are not frequently used.
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*g:paredit_disable_clojure*
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*g:paredit_disable_lisp*
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*g:paredit_disable_scheme*
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*g:paredit_disable_shen*
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If defined then paredit is disabled for the given file type. Useful to use
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a different plugin for a specific file type, but keep using paredit for the
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others.
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*g:paredit_electric_return*
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If nonzero then "electric return" feature is enabled. This means that when an
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<Enter> is pressed before a closing paren in insert mode, paredit will actually
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insert two newlines creating an empty line. The extra newline is consumed at
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pressing the next closing paren. This feature allows linewise editing of the
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subform entered in the next (empty) line.
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In other words <Enter> "opens" parenthetical expressions while editing, ')'
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"closes" them.
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Please note that electric return is disabled for the REPL buffer if Slimv
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option |g:slimv_repl_simple_eval| is nonzero. In this case <Enter> is used
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to send the command line to the swank server for evaluation.
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Please find a video demonstration of the electric return feature here:
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http://img8.imageshack.us/img8/9479/openparen.gif
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*g:paredit_smartjump*
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If nonzero, this option changes the behavior of '(' and ')' in normal and visual
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modes when editing Clojure or Scheme. Rather than jumping to nearest open or close
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parenthesis, instead the cursor will jump to the nearest '(', '[', or '{' if
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you press '(', and it will jump to the nearest ')', ']', or '}' if you press
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')'. This option makes it much easier to navigate nested Clojure data
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structures. It does nothing if the filetype is not clojure or Scheme.
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*g:paredit_leader*
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This option allows a custom <Leader> setting for the Paredit keybindings.
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By default it has the same value as |mapleader|. If neither g:paredit_leader
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nor mapleader are defined then the default <Leader> is "," in Paredit.
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Example:
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let g:paredit_leader = '\'
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If this is set in the .vimrc then Wrap will be mapped to \W instead of ,W.
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There is a separate |g:slimv_leader| option for the general Slimv keybindings.
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*g:paredit_matchlines*
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Number of lines to look backward and forward when checking if the current
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top level form is balanced in paredit mode. Default is 100.
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*g:paredit_mode*
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If nonzero then paredit mode is switched on, i.e. the plugin tries to keep the
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balanced state of parens. This is the default behaviour.
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*g:paredit_shortmaps*
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If nonzero, paredit is remapping some one-letter normal mode Vim commands that
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are not frequently used. These are <, >, J, O, W, S. The original function of
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these maps then can be reached via <Leader> (which is the "," character
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by default in Paredit).
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Otherwise these paredit functions can be reached via <Leader> maintaining the
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original functions of these keys.
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===============================================================================
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vim:tw=80:et:wrap:ft=help:norl:
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