This is probably not an issue in Mill, but in either Zinc or mainargs.
After a clean build when changing the @arg.doc attribute of one argument in foo.Config, a recompile results in only on recompiled file Config.scala.
The file ConfigParser.scala gets not recompiled, yet it contains a lazy val usageText = parser.helpText().
parser is a private[this] lazy val parser: ParserForClass[MillConfig] = mainargs.ParserForClass[MillConfig]).
The expectation is, that also ConfigParser.scala gets recompiled.
This does not happen.
This results in outdate/stale help messages.
Reproduction steps
$ mill clean [1/1] clean $ mill foo.run --help [33/46] foo.compile Compiling compiler interface... [info] compiling 2 Scala sources to /tmp/mainargs-repro/out/foo/compile.dest/classes ... [info] done compiling [46/46] foo.run apply --help Print this help message. $ sed -i "s/Print this help message/Print another message/" foo/src/Config.scala $ mill foo.run --help [33/46] foo.compile [info] compiling 1 Scala source to /tmp/mainargs-repro/out/foo/compile.dest/classes ... (1) [info] done compiling [46/46] foo.run apply --help Print this help message. (2)
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We would expect 2 recompiled files here
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We would expect the output:
--help Print another message.
A clean build works as expected
$ mill clean [1/1] clean $ mill foo.run --help [33/46] foo.compile [info] compiling 2 Scala sources to /tmp/mainargs-repro/out/foo/compile.dest/classes ... [info] done compiling [46/46] foo.run apply --help Print another message.