Clone the Repository.

git clone https://github.com/z-shell/F-Sy-H ~/path/to/fsh

And add the following to your zshrc file.

source ~/path/to/fsh/f-sy-h.plugin.zsh

Add the following to your zshrc file.

zi light z-shell/F-Sy-H

Here's an example of how to load the plugin together with a few other popular ones with the use of Turbo, i.e.: speeding up the Zsh startup by loading the plugin right after the first prompt, in background:

zi wait lucid for \
 atinit"ZI[COMPINIT_OPTS]=-C; zicompinit; zicdreplay" \
    z-shell/F-Sy-H \
 blockf \
    zsh-users/zsh-completions \
 atload"!_zsh_autosuggest_start" \
    zsh-users/zsh-autosuggestions

Add the following to your zshrc file.

zinit light z-shell/F-Sy-H

Add the following to your zshrc file.

antigen bundle z-shell/F-Sy-H

Add the following to your .zshrc file in the same place you're doing your other zgen load calls in.

zgen load z-shell/F-Sy-H . main

Clone the Repository.

git clone https://github.com/z-shell/F-Sy-H.git \
  ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/plugins/F-Sy-H

And add F-Sy-H to your plugin list.

Switch themes via fast-theme {theme-name}.

Run fast-theme -t {theme-name} option to obtain the snippet above.

Run fast-theme -l to list available themes.

Comparing to the project zsh-users/zsh-syntax-highlighting (the upper line):

Comparing to the project zsh-users/zsh-syntax-highlighting (the upper line):

Exact highlighting that recognizes quotings.

Comparing to the project zsh-users/zsh-syntax-highlighting (the upper line):

Comparing to the project zsh-users/zsh-syntax-highlighting (the upper 2 lines):

Comparing to the project zsh-users/zsh-syntax-highlighting (the upper line):

Highlighting that is specific for a given command.

The chromas that are enabled by default can be found here.

Performance differences can be observed in this Asciinema recording, where a 10 kB function is being edited.