I am using sbt through the emacs sbt-mode (of which I'm the maintainer), which reports it self as a TERM=dumb.

I was using sbt version 1.6.2 and noticed that the console is echoing erroneously and came to write a bug report on that. While doing so, I decided to upgrade to latest sbt (1.9.4) so as not to report a bug against an old version. To do so, I created a new clean project and there 1.6.2 as well as 1.9.4 are even more broken, so much so that at the moment the console is unusable in term=DUMP in 1.9.4.

I will thus report both behaviors (partially broken 1.6.2 and completely broken 1.9.4) here.

The partial echo problem was also reproduced on 1.8.3 by @rossabaker (in the Cats project)

steps

1. Create an empty new project folder and move to it
2. run env TERM=dumb sbt consoleQuick
3. type: "foo"
4. you will see the following:

scala> "foo"
foo"
<console>:1: error: unclosed string literal
       foo"

5. type vval x = 1 [sic!]

scala> vval x = 1
val x = 1
x: Int = 1

If at step 2. you run env TERM=dumb sbt and then in sbt-shell type consoleQuick it works differently. In this case, there is full echo, but the first character of the input is not skipped. The scala version in the clean project is the default 2.12.15

For 1.6.2 in my project (with scala version 2.13.8), I get the following

1. run env TERM=dumb sbt consoleQuick
2. type "foo" and there is no echo

scala> "foo"
val res1: String = foo

3. type "foo)bar" and there is echo until )

scala> "foo)bar"
"foo)val res2: String = foo()

4. type "foo)bar(}zot{"

scala> "foo)bar(}zot{"
"foo)bar(}val res11: String = foo)bar(}zot{

In the latter case, the results do not depend on whether the console was started from the command line or from sbt shell.

problem

When in the DUMB terminal mode, there should be no echo. However...

1.9.4 in clean and empty project folder: there is full echo (the line right after the input was given) and the console is skipping the first character of the input.

1.6.2 in my project: there is no echo on most input, but if the input contains any closing parenthesis or brackets ()}]), the terminal echoes the part of the expression until the last closing bracket. Note that the closing parenthesis can be even inside a string

expectation

There should be no echo in any case and the terminal should not skip the first character of input.

notes