{ pkgs, lib, ... }:
let 
  hgrcPkg = pkgs.writeText "lukegb-hgrc" ''
    [ui]
    username = Luke Granger-Brown <hg@lukegb.com>
    interface = curses
    tweakdefaults = True
    merge = internal:merge3
    
    [alias]
    log = log --template lukegblogshort --graph
    xl = log -r 'smartlog()'
    
    [revsetalias]
    # We're interested in the current commit, and any non-extinct commits in the draft or secret phases.
    smartlogstart() = . | ((draft() | secret()) - extinct())
    # Now expand smartlogstart to go up to the parent public commit.
    publichead(r1) = ancestors(r1) - (descendants(public(), 1) and public())
    smartlogstart() = (parents(not public()) or not public() or . or head()) and (not obsolete() or unstable()^) and not closed()
    smartlog() = publichead(smartlogstart())::smartlogstart() | smartlogstart()
    
    [color]
    mode = terminfo
    
    custom.rev = green bold
    custom.revprefix = green bold inverse
    custom.author = red
    custom.currentcommit_message = magenta
    custom.bookmarks = bold orange
    custom.date = lightyellow
    
    color.orange = 202
    color.lightyellow = 191
    
    [templates]
    lukegblogshort = {label('custom.rev', lukegbnode)} {label('custom.date', lukegbdate)} {label('custom.author', lukegbauthor)} {label(ifcontains(rev, revset('.'), 'custom.currentcommit_message', 'custom.message'), lukegbmsg)} {label('custom.bookmarks', bookmarks)}\n
    lukegbdate = {date|age}
    lukegbmsg = {desc|firstline}
    lukegbcopybarain = {sub('^noreply\+([^@]+)@lukegb.com$', 'copybara:\\1', author|email)}
    lukegbcopybara = {ifcontains(lukegbcopybarain, '@', "", lukegbcopybarain)}
    lukegbauthor = {ifeq('hg@lukegb.com', author|email, 'lukegb', if(lukegbcopybara, lukegbcopybara, author|email))}
    lukegbnode = {label('custom.revprefix', lukegbnodesh)}{lukegbnodelng}
    lukegbnodesh = {node|shortest}
    lukegbnodelng = {sub('^{lukegbnodesh}', "", '{node|short}')}
    
    [extensions]
    histedit =
    rebase =
    strip =
    remotenames =
    amend =
    evolve =
    topic =
  '';
in
{
  system.activationScripts.lukegb-hgrc = lib.stringAfter [ "users" "groups" ] ''
    ln -sfn ${hgrcPkg} /home/lukegb/.hgrc
  '';
}