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Fish shell like syntax highlighting for Zsh.
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This means --foo="bar" will have quotes highlighted.
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README.md

zsh-syntax-highlighting Build Status

Fish shell-like syntax highlighting for Zsh.

Requirements: zsh 4.3.11+.

This package provides syntax highlighing for the shell zsh. It enables
highlighing of commands whilst they are typed at a zsh prompt into an
interactive terminal. This helps in reviewing commands before running
them, particularly in catching syntax errors.

Some examples:

Before: Screenshot #1.1


After:  Screenshot #1.2

Before: Screenshot #2.1


After:  Screenshot #2.2

Before: Screenshot #3.1


After:  Screenshot #3.2

How to install

See INSTALL.md.

FAQ

Why must zsh-syntax-highlighting.zsh be sourced at the end of the .zshrc file?

zsh-syntax-highlighting.zsh wraps ZLE widgets. It must be sourced after all
custom widgets have been created (i.e., after all zle -N calls and after
running compinit). Widgets created later will work, but will not update the
syntax highlighting.

Does syntax highlighting work during incremental history search?

Highlighting the command line during an incremental history search (by default bound to
to Ctrl+R in zsh's emacs keymap) requires zsh 5.4 or newer.

Under zsh versions older than 5.4, the zsh-default underlining
of the matched portion of the buffer remains available, but zsh-syntax-highlighting's
additional highlighting is unavailable. (Those versions of zsh do not provide
enough information to allow computing the highlighting correctly.)

See issues #288 and #415 for details.

How are new releases announced?

There is currently no "push" announcements channel. However, the following
alternatives exist:

How to tweak

Syntax highlighting is done by pluggable highlighter scripts. See the
documentation on highlighters for details and
configuration settings.