@node Features
@cindex features
@unnumbered Features

Notable features that differentiate @command{goredo} from many other
implementations.

@itemize

@item explicit useful and convenient checks from @command{apenwarr/redo}:
    @itemize
    @item check that @file{$1} was not touched during .do execution
    @item check that @file{stdout} and @file{$3} are not written simultaneously
    @item check that generated target was not modified "externally" outside
      the redo, preventing its overwriting, but continuing the build
      (optionally can stop)
    @end itemize
@item recursive, indented and serialized logs display ability, with
    priority to the depth and bad return codes, like in @command{apenwarr/redo},
    thanks to @url{https://apenwarr.ca/log/20181106, apenwarr's article}
@item all environment variables, working directory, command line
    arguments, start/finish times, duration, participated PIDs, return
    codes can be saved for later investigation
@item targets, dependency information and their directories are explicitly
  synced (can be disabled, should work faster)
@item file's change is detected by comparing its size, and
    @url{https://github.com/BLAKE3-team/BLAKE3, BLAKE3} hash. Also as an
    optimization, by default if file's @code{ctime} is same, then hash
    check is skipped. Optionally you can disable that behaviour, or even
    enable trust to file's @code{mtime}
@item files creation is @code{umask}-friendly (unlike @code{mkstemp()}
    used in @command{redo-c})
@item parallel build with jobs limit, optionally in infinite mode
@item optional coloured messages
@item verbose debug messages, including out-of-date determination, PIDs,
  lock and jobserver acquirings/releases
@item displaying of each target's execution time
@item each target's @file{stderr} can be prefixed with the PID
@item optional statusline with currently running/waiting/done jobs
@item target's @file{stderr} can be stored on the disk with
    @url{http://cr.yp.to/libtai/tai64.html, TAI64N} timestamp prefixes
    for each line. To convert them to localtime you can use either
    @command{tai64nlocal} utility from
    @url{http://cr.yp.to/daemontools.html, daemontools}, or similar one:
    @code{go install go.cypherpunks.ru/tai64n/v2/cmd/tai64nlocal@@latest}
@item Either @url{https://www.gnu.org/software/make/, GNU Make}
    or @url{http://netbsd.org/, NetBSD}'s @command{bmake}
    @ref{Jobserver, jobserver} compatibility support

@end itemize