nu-ffmpeg/filters.nu

#!/usr/bin/env -S nu --stdin

def "parse filter" [
] {
  $in | parse --regex '^(?<name>[^=]+)=(?<params>.*)' | first |
  update params {|row| $row.params | parse --regex `(?<param>[^=]+)=(?<value>[^:]+):?` }
}

def "filter to-string" [] {
  each { |filter| $'($filter.name)=($filter.params | format '{param}={value}')' } |
  str join ':' 
}

def "complex-filters to-string" [
  --pretty-print (-p)
]: table<input: list<string>, filters: table<name: string, params: table<param: string, value: string>>, output: string> -> string {
    $in | update filters {
      |$row| $row.filters | flatten | filter to-string
    } | update input { |row|
      $row.input | str join ']['
    } | format '[{input}]{filters}[{output}]' | str join (";" + (if $pretty_print { "\n"  } else { "" })) | str replace --all '[]' ''
}