def debugLog($target; $value):
  if 
    ($ENV["JQ_DEBUG"] == $target)
    or
    ($target == "*")
    or
    ($ENV["JQ_DEBUG"] | split(",") | any(. as $debugTarget | $target | startswith($debugTarget | split("*")[0])))
   then
    debug({$target, $value})
  end;

def assert(cond; $msg): if cond then . else error($msg) end;
def assert($loc; cond; $msg): assert(cond; "\($loc.file):\($loc.line): " + $msg);

def titleCase:
  [splits("\\b") | select(length>0)]
  | map((.[:1]|ascii_upcase) + (.[1:] |ascii_downcase))
  | join("");

def lpad(string;len;fill):
  if len == 0 then string else (fill * len)[0:len] + string end;

def rpad(string;len;fill):                                                                                                                                                                                                                                             
  if len == 0 then string else string + (fill * len)[0:len] end;

def firstN($n): .[:$n];

# only use when // does not suffice
def ifNullDefault($value; $default):
	if $value != null then
		$value
	else
		$default
	end;

def orderedUnique:
  (reduce .[] as $value ([];
    if 
      (. | any(index($value)) | not)
    then . += [$value]
    else . end
  ));

def printPrettyTable($title; $columnTitles; $rows):
  if [$rows[] | length] | unique | length > 1 then error("non-even number of columns") end |
  $title | if . == null then "" end | . as $title |

  " | " as $columnSeperator |
  ([$rows[] | length] | unique[0] // 0) as $columns |
  [$rows[] as $columns | [$columns[] | length]] as $columnLengths |

  (reduce $columnLengths[] as $lengths ([range($columns) | 0];
    [range($columns) as $columnNumber | [.[$columnNumber], $lengths[$columnNumber]] | max]
  )) as $maxColumnLengths |

  (reduce $columnLengths[] as $lengths ($maxColumnLengths;
    [range($columns) as $columnNumber | [.[$columnNumber], ($columnTitles[$columnNumber] | length)] | max]
  )) as $maxColumnLengths |

  (reduce range($columns) as $columnNumber ([];
    $columnTitles[$columnNumber] as $title |
    . += [
      if $columnNumber == 0 then
        lpad($title; $maxColumnLengths[$columnNumber] - ($title | length) ; " ")
      else 
        rpad($title; $maxColumnLengths[$columnNumber] - ($title | length) ; " ")
      end
    ]
  )) | join($columnSeperator) as $columnTitleRow |

  (reduce $rows[] as $row ([];
    . += [(reduce range($columns) as $columnNumber ([]; . += [
      $row[$columnNumber] as $column |

      if $columnNumber == 0 then
        lpad($column; $maxColumnLengths[$columnNumber] - ($column | length) ; " ")
      else 
        rpad($column; $maxColumnLengths[$columnNumber] - ($column | length) ; " ")
      end
    ]))]
  )) as $rows |

  $title | length as $titleLength |

  ((($columns - 1) * ($columnSeperator | length)) + ($maxColumnLengths | add)) as $maxRowLength |
  [
    $maxRowLength,
    $titleLength
  ] | max as $maxLength |

  # Pad title to be centered to maximum row length
  $title | if $titleLength < $maxRowLength then
    lpad($title; ($maxLength - $titleLength) / 2; " ")
  end | . as $title |

  # if title is longer than maximum row length, pad the first row the difference between them
  $rows | if $titleLength > $maxRowLength then
    (reduce .[] as $row ([];
      . += [
        [
          lpad($row[0]; $titleLength - $maxRowLength; " ")
        ] + $row[1:]
      ]
    ))
  end | . as $rows |

  ($rows | map(join($columnSeperator))) as $rows |
  if $title != null then 
    [
      $title,
      ([range($maxLength) | "-"] | join("")),
      $columnTitleRow,
      ([range($maxLength) | "-"] | join("")),
      $rows
    ] | flatten | join("\n") + "\n"
  else 
    [
      $columnTitleRow,
      $rows
    ] | flatten | join("\n") + "\n"
  end;