Fix log() output so you can cut-and-paste it verbatim into a command line.

It used to say:
	redo:   t/all
	redo:     hello
and now it says:
	redo    t/all
	redo      t/hello

ie. there's no colon, and the path is intact.  That means if the build
fails, you can cut-and-paste 'redo   t/hello', add a -v, and try to debug
what went wrong.

helpers.py

@@ -48,10 +48,10 @@ def _log(s):
 
 def _clog(s):
     if vars.VERBOSE: _log('\n')
-    _log('\x1b[32mredo: %s\x1b[1m%s\x1b[m' % (vars.DEPTH, s))
+    _log('\x1b[32mredo  %s\x1b[1m%s\x1b[m' % (vars.DEPTH, s))
 def _bwlog(s):
     if vars.VERBOSE: _log('\n')
-    _log('redo: %s%s' % (vars.DEPTH, s))
+    _log('redo  %s%s' % (vars.DEPTH, s))
 
 def _cerr(s):
     _log('\x1b[31mredo: %s\x1b[1m%s\x1b[m' % (vars.DEPTH, s))

redo.py

@@ -28,6 +28,7 @@ if not os.environ.get('REDO_BASE', ''):
             base = newbase
             break
     os.environ['REDO_BASE'] = base
+    os.environ['REDO_STARTDIR'] = os.getcwd()
 
 import vars
 from helpers import *
@@ -90,11 +91,10 @@ def build(t):
             os.path.basename(t), 'FIXME', os.path.basename(tmpname)]
     if vars.VERBOSE:
         argv[1] += 'v'
-    log('%s\n' % t)
+    log('%s\n' % relpath(t, vars.STARTDIR))
     rv = subprocess.call(argv, preexec_fn=lambda: _preexec(t),
                          stdout=f.fileno())
     st = os.stat(tmpname)
-    #log('rv: %d (%d bytes) (%r)\n' % (rv, st.st_size, dofile))
     stampfile = sname('stamp', t)
     if rv==0:
         if st.st_size:

vars.py

@@ -4,6 +4,7 @@ TARGET = os.environ.get('REDO_TARGET', '')
 DEPTH = os.environ.get('REDO_DEPTH', '')
 DEBUG = os.environ.get('REDO_DEBUG', '') and 1 or 0
 VERBOSE = os.environ.get('REDO_VERBOSE', '') and 1 or 0
+STARTDIR = os.environ.get('REDO_STARTDIR', '')
 BASE = os.environ.get('REDO_BASE', '')
 if BASE:
     BASE = os.path.abspath(BASE)