:program:`fish_indent` is used to indent a piece of fish code. :program:`fish_indent` reads commands from standard input or the given filenames and outputs them to standard output or a specified file (if ``-w`` is given).
-``-c`` or ``--check`` do not indent, only return 0 if the code is already indented as fish_indent would, the number of failed files otherwise. Also print the failed filenames if not reading from stdin.
-``--ansi`` colorizes the output using ANSI escape sequences, appropriate for the current $TERM, using the colors defined in the environment (such as ``$fish_color_command``).
-``--html`` outputs HTML, which supports syntax highlighting if the appropriate CSS is defined. The CSS class names are the same as the variable names, such as ``fish_color_command``.
-``-d`` or ``--debug=DEBUG_CATEGORIES`` enable debug output and specify a pattern for matching debug categories. See :ref:`Debugging <debugging-fish>` in :ref:`fish <cmd-fish>` (1) for details.
-``-o`` or ``--debug-output=DEBUG_FILE`` specify a file path to receive the debug output, including categories and ``fish_trace``. The default is stderr.
-``--dump-parse-tree`` dumps information about the parsed statements to stderr. This is likely to be of interest only to people working on the fish source code.
