zsh-syntax-highlighting / highlighters / brackets
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This is the ***brackets*** highlighter, that highlights brackets, parenthesis and matches them.


How to activate it
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To activate it, add it to `ZSH_HIGHLIGHT_HIGHLIGHTERS`:

    ZSH_HIGHLIGHT_HIGHLIGHTERS=( [...] brackets)


How to tweak it
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This highlighter defines the following styles:

* `bracket-error` - unmatched brackets
* `bracket-level-N` - brackets with nest level N
* `cursor-matchingbracket` - the matching bracket, if cursor is on a bracket

To override one of those styles, change its entry in `ZSH_HIGHLIGHT_STYLES`, for example in `~/.zshrc`:

    # To define styles for nested brackets up to level 4
    ZSH_HIGHLIGHT_STYLES[bracket-level-1]='fg=blue,bold'
    ZSH_HIGHLIGHT_STYLES[bracket-level-2]='fg=red,bold'
    ZSH_HIGHLIGHT_STYLES[bracket-level-3]='fg=yellow,bold'
    ZSH_HIGHLIGHT_STYLES[bracket-level-4]='fg=magenta,bold'

The syntax for declaring styles is [documented here](http://zsh.sourceforge.net/Doc/Release/Zsh-Line-Editor.html#SEC135).