Make calls to logs.setup() explicit in each cmd.

Further reducing magic implicit behaviour to make code easier to
follow.

redo/cmd_whichdo.py

@@ -1,14 +1,16 @@
 import sys, os
-from . import env, paths
+from . import env, logs, paths
 from .logs import err
 
 
 def main():
-    env.init_no_state()
     if len(sys.argv[1:]) != 1:
-        err('%s: exactly one argument expected.\n' % sys.argv[0])
+        sys.stderr.write('%s: exactly one argument expected.\n' % sys.argv[0])
         sys.exit(1)
 
+    env.init_no_state()
+    logs.setup(tty=sys.stderr, pretty=env.v.PRETTY, color=env.v.COLOR)
+
     want = sys.argv[1]
     if not want:
         err('cannot build the empty target ("").\n')