I just lost a few hours understanding why my tasks were always re-executing despite my 'uptodate' command string being ok (or so I thought).

My command was a multiline command (see #314 ).

It turned out that the error was, as always, a stupid mistake from my side. But I could have debugged it in a FAR shorter time if I had been able to see a few console prints confirming a few assumptions:

• that my 'uptodate' command was actually executed
• the contents of my 'uptodate' command
• and the stdout of my 'uptodate' command (so that I could introduce some debug prints

For example:

> Evaluating if <task_name>:<subtask_name> is up-to-date...
    - Executing command 'echo "hello" & conda activate blah & python -c "cool_code" & echo "ok"'
         hello
         ok
-- <task_name>:<subtask_name>

These messages could be printed 'by default', or in a verbose mode (there does not seem to be any global verbose flag by the way).

Thoughts ?