feat(sbt): add "--server" - #37
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- Add `--server` flag to sbt command arguments to run sbt server in foreground. sbt 2 by default runs sbtn (thin client)
s5bug
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Jul 6, 2026
| // Utility to invoke a given sbt task and fetch its output | ||
| function printSbtTask(task: string, cwd?: string): Promise<string> { | ||
| const args = ["--batch", "-no-colors", "-Dsbt.supershell=false", `print ${task}`]; | ||
| const args = ["--server", "--batch", "-no-colors", "-J-Dsbt.supershell=false", `print ${task}`]; |
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Not sure that the correct solution here is to use --server. If we take a look at SBT 2 output:
aly@hydrogen ~/D/d/scalajs (main)> sbt --batch -no-colors -Dsbt.supershell=false "print fullLinkJSOutput" | hexdump -C
00000000 2f 68 6f 6d 65 2f 61 6c 79 2f 44 6f 63 75 6d 65 |/home/aly/Docume|
00000010 6e 74 73 2f 64 70 66 2d 70 6c 61 79 67 72 6f 75 |nts/dpf-playgrou|
00000020 6e 64 2f 73 63 61 6c 61 6a 73 2f 74 61 72 67 65 |nd/scalajs/targe|
00000030 74 2f 6f 75 74 2f 73 6a 73 31 2f 73 63 61 6c 61 |t/out/sjs1/scala|
00000040 2d 33 2e 38 2e 34 2f 64 70 66 70 6c 61 79 67 72 |-3.8.4/dpfplaygr|
00000050 6f 75 6e 64 2f 64 70 66 70 6c 61 79 67 72 6f 75 |ound/dpfplaygrou|
00000060 6e 64 2d 6f 70 74 0a 5b 73 75 63 63 65 73 73 5d |nd-opt.[success]|
00000070 20 65 6c 61 70 73 65 64 20 74 69 6d 65 3a 20 30 | elapsed time: 0|
00000080 20 73 0a 1b 5b 30 4a | s..[0J|
00000087
There's an \x1b[0J here in the thin client that doesn't appear in the output when using --server, but otherwise the thin client's output is correct & is much faster to execute than the server.
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One solution would be to write the task output to a temporary file instead:
aly@hydrogen ~/D/d/scalajs (main) [1]> sbt --batch -no-colors -Dsbt.supershell=false 'set TaskKey[Unit]("dummy") := sbt.IO.write(file("/tmp/tmp.TFqXG6olui"), (Compile / fullLinkJSOutput).value.absolutePath);' 'dummy'
[info] Defining dummy
[info] The new value will be used by no settings or tasks.
[info] Reapplying settings...
[info] set current project to dpfPlayground (in build file:/home/aly/Documents/dpf-playground/scalajs/)
[success] elapsed time: 2 s
aly@hydrogen ~/D/d/scalajs (main)> cat /tmp/tmp.TFqXG6olui
/home/aly/Documents/dpf-playground/scalajs/target/out/sjs1/scala-3.8.4/dpfplayground/dpfplayground-opt⏎
| // Utility to invoke a given sbt task and fetch its output | ||
| function printSbtTask(task: string, cwd?: string): Promise<string> { | ||
| const args = ["--batch", "-no-colors", "-Dsbt.supershell=false", `print ${task}`]; | ||
| const args = ["--server", "--batch", "-no-colors", "-J-Dsbt.supershell=false", `print ${task}`]; |
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The -J here is incorrect, if you read sbt --help:
-Dkey=val pass -Dkey=val directly to the java runtime
-J-X pass option -X directly to the java runtime
(-J is stripped)
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--serverflag to sbt command arguments to run sbt server in foreground.sbt 2 by default runs sbtn (thin client)