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diff --git a/.config/shells/zsh/plugins/zsh-syntax-highlighting/highlighters/root/README.md b/.config/shells/zsh/plugins/zsh-syntax-highlighting/highlighters/root/README.md
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+zsh-syntax-highlighting / highlighters / root
+---------------------------------------------
+
+This is the `root` highlighter, that highlights the whole line if the current
+user is root.
+
+
+### How to tweak it
+
+This highlighter defines the following styles:
+
+* `root` - the style for the whole line if the current user is root.
+
+To override one of those styles, change its entry in `ZSH_HIGHLIGHT_STYLES`,
+for example in `~/.zshrc`:
+
+```zsh
+ZSH_HIGHLIGHT_STYLES[root]='bg=red'
+```
+
+The syntax for values is the same as the syntax of "types of highlighting" of
+the zsh builtin `$zle_highlight` array, which is documented in [the `zshzle(1)`
+manual page][zshzle-Character-Highlighting].
+
+[zshzle-Character-Highlighting]: http://zsh.sourceforge.net/Doc/Release/Zsh-Line-Editor.html#Character-Highlighting
diff --git a/.config/shells/zsh/plugins/zsh-syntax-highlighting/highlighters/root/root-highlighter.zsh b/.config/shells/zsh/plugins/zsh-syntax-highlighting/highlighters/root/root-highlighter.zsh
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+# -------------------------------------------------------------------------------------------------
+# Copyright (c) 2010-2011 zsh-syntax-highlighting contributors
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification, are permitted
+# provided that the following conditions are met:
+#
+#  * Redistributions of source code must retain the above copyright notice, this list of conditions
+#    and the following disclaimer.
+#  * Redistributions in binary form must reproduce the above copyright notice, this list of
+#    conditions and the following disclaimer in the documentation and/or other materials provided
+#    with the distribution.
+#  * Neither the name of the zsh-syntax-highlighting contributors nor the names of its contributors
+#    may be used to endorse or promote products derived from this software without specific prior
+#    written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+# FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# -------------------------------------------------------------------------------------------------
+# -*- mode: zsh; sh-indentation: 2; indent-tabs-mode: nil; sh-basic-offset: 2; -*-
+# vim: ft=zsh sw=2 ts=2 et
+# -------------------------------------------------------------------------------------------------
+
+
+# Define default styles.
+: ${ZSH_HIGHLIGHT_STYLES[root]:=standout}
+
+# Whether the root highlighter should be called or not.
+_zsh_highlight_highlighter_root_predicate()
+{
+  _zsh_highlight_buffer_modified
+}
+
+# root highlighting function.
+_zsh_highlight_highlighter_root_paint()
+{
+  if (( EUID == 0 )) { _zsh_highlight_add_highlight 0 $#BUFFER root }
+}