nix-configs/build-utils/templ-edit.nu

#!/usr/bin/env nu

def main [] {}

def "main find" [
  file: string
] {
  open $file --raw
  | lines
  | enumerate
  | update item {|it| $it.item | parse '{current}# :{name}:-{template}-:#' }
  | where {|it|  $it.item | is-not-empty }
  | flatten -a
  | rename -c { index: line }
  | to json
}

# TODO: support mroe then single template
def "main edit" [
  file: path
  name: string
  to: string
  --preview
] {
  let template = main find $file
    | from json
    | where name == $name
    | first;
  let new = $template.template
    | str replace $"%($name)%" $to
    | append $" # :($template.name):-($template.template)-:#"
    | str join;
  let rest = open $file --raw
    | lines
    | enumerate
    | where index != $template.line
    | append { index: $template.line, item: $new}
    | sort-by index
    | reject index
    | get item
    | append ""
    | str join "\n";

  if $preview {
    print $rest
  } else {
    $rest | save -f $file
  }
}