@node Notes
@unnumbered Implementation notes

@itemize

@item @file{all} target is default
@item @file{stdout} is always captured, but no target is created if it
    was empty
@item empty targets are considered always out of date
@item @file{.do}'s @file{$3} is relative path to the file in target directory
@item @file{.do} search goes up to @file{/} by default, but can be
    limited with either @env{$REDO_TOP_DIR} environment variable, or by
    having @file{.redo/top} file in it
@item target's completion messages are written after they finish
@item executable @file{.do} is run as is, non-executable is run with
    @code{/bin/sh -e[x]}
@item tracing (-x) can be obviously done only for non-executable @file{.do}
@item parallizable build is done only during @command{redo-ifchange} for
    human convenience: you can globally enable @env{REDO_JOBS}, but
    still do for example: @code{redo htmls infos index upload}

@end itemize