This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/prs-already-reviewed/2617/67

Thank you for your contribution, but please keep "PRs already reviewed" to only those PRs that have actually been reviewed ;)

@GrahamcOfBorg build zsh-fast-syntax-highlighting

@pasqui23 I took liberty to further simplify the expression. The "cd $src" line is actually not needed after unpackPhase creates a copy of the source code and harmful in cases when user tries to add patches or override src to point to a tarball. Also "install -m644" doesn't do anything for us, the write bit will be reset by Nix for files in the store. An "install -m444" would be fine, but we are already doing "cp" on some directories, so we might as well stick with it.

@veprbl sorry to bother you in this old issue but how did you use the package? Did you just do

{
  programs.zsh.interactiveShellInit = ''
    source ${pkgs.zsh-fast-syntax-highlighting}/share/zsh/site-functions/fast-syntax-highlighting.plugin.zsh
  '';
}

in your configuration.nix or is there a better way?

@lucc, I never set this up on my system, just tested that it works to "source" it in zsh.