diff --git a/cuburnlib/cuda.py b/cuburnlib/cuda.py
index d367a60..2aedc43 100644
--- a/cuburnlib/cuda.py
+++ b/cuburnlib/cuda.py
@@ -43,6 +43,10 @@ class LaunchContext(object):
     def threads(self):
         return reduce(lambda a, b: a*b, self.block + self.grid)
 
+    def print_source(self):
+        print '\n'.join(["%03d %s" % (i+1, l) for (i, l) in
+                        enumerate(self.ptx.source.split('\n'))])
+
     def compile(self, to_inject={}, verbose=False):
         inj = dict(to_inject)
         inj['ctx'] = self
@@ -51,10 +55,11 @@ class LaunchContext(object):
             self.mod = cuda.module_from_buffer(self.ptx.source)
         except (cuda.CompileError, cuda.RuntimeError), e:
             print "Aww, dang, compile error. Here's the source:"
-            print '\n'.join(["%03d %s" % (i+1, l) for (i, l) in
-                            enumerate(self.ptx.source.split('\n'))])
+            self.print_source()
             raise e
         if verbose:
+            if verbose >= 3:
+                self.print_source()
             for entry in self.ptx.entries:
                 func = self.mod.get_function(entry.entry_name)
                 print "Compiled %s: used %d regs, %d sm, %d local" % (
diff --git a/cuburnlib/ptx.py b/cuburnlib/ptx.py
index 6367c40..97c5b56 100644
--- a/cuburnlib/ptx.py
+++ b/cuburnlib/ptx.py
@@ -74,7 +74,7 @@ from collections import namedtuple
 
 def _softjoin(args, sep):
     """Intersperses 'sep' between 'args' without coercing to string."""
-    return [(arg, sep) for arg in args[:-1]] + args[-1:]
+    return [[arg, sep] for arg in args[:-1]] + list(args[-1:])
 
 BlockCtx = namedtuple('BlockCtx', 'locals code injectors')
 PTXStmt = namedtuple('PTXStmt', 'prefix op vars semi indent')
@@ -292,12 +292,14 @@ class Block(object):
         return self
     def __enter__(self):
         self.block.push_ctx()
-        self.block.code(op='{', indent=1, semi=False)
+        self.block.code(op='{', semi=False)
+        self.block.code(indent=1)
         if self.comment:
             self.block.code(op=['// ', self.comment], semi=False)
         self.comment = None
     def __exit__(self, exc_type, exc_value, tb):
-        self.block.code(op='}', indent=-1, semi=False)
+        self.block.code(indent=-1)
+        self.block.code(op='}', semi=False)
         self.block.pop_ctx()
 
 class _CallChain(object):
@@ -343,7 +345,7 @@ class _RegFactory(_CallChain):
         type = type[0]
         names = names.split()
         regs = map(lambda n: Reg(type, n), names)
-        self.block.code(op='.reg .' + type, vars=_softjoin(names, ', '))
+        self.block.code(op='.reg .' + type, vars=_softjoin(names, ','))
         [self.block.inject(r.name, r) for r in regs]
 
 class Op(_CallChain):
@@ -374,7 +376,7 @@ class Op(_CallChain):
             pred = ['@', kwargs['ifp']]
         if 'ifnotp' in kwargs:
             pred = ['@!', kwargs['ifnotp']]
-        self.block.code(pred, '.'.join(op), _softjoin(args, ', '))
+        self.block.code(pred, '.'.join(op), _softjoin(args, ','))
 
 class Mem(object):
     """
@@ -408,11 +410,8 @@ class Mem(object):
         >>> op.ld.global.v2.u32(vec(reg1, reg2), addr(areg))
         """
         assert len(args) >= 2, "vector loads make no sense with < 2 args"
-        joined = _softjoin(args, ', ')
-        # This makes a list like [('{', ('arg1', ', ')), ('argf', '}')], which
-        # when compacted comes out like ['{arg1,', 'argf}'], which lets the
-        # formatter work properly. There's no semantic value to this.
-        return [('{', joined[0])] + joined[1:-1] + [(joined[-1], '}')]
+        # TODO: fix the way this looks (not so easy)
+        return ['{', _softjoin(args, ','), '}']
 
     @staticmethod
     def addr(areg, aoffset=''):
@@ -786,33 +785,49 @@ class PTXModule(object):
                 raise ValueError("Too many recompiles scheduled!")
             self.__needs_recompilation = True
 
+def _flatten(val):
+    if isinstance(val, (list, tuple)):
+        return ''.join(map(_flatten, val))
+    return str(val)
+
 class PTXFormatter(object):
     """
     Formats PTXStmt items into beautiful code. Well, the beautiful part is
     postponed for now.
     """
-    def __init__(self, indent=4):
-        self.indent_amt = 4
-    def _flatten(self, val):
-        if isinstance(val, (list, tuple)):
-            return ''.join(map(self._flatten, val))
-        return str(val)
+    def __init__(self, indent_amt=2, oplen_max=20, varlen_max=12):
+        self.idamt, self.opm, self.vm = indent_amt, oplen_max, varlen_max
     def format(self, code):
         out = []
         indent = 0
-        for (pfx, op, vars, semi, indent_change) in code:
-            pfx = self._flatten(pfx)
-            op = self._flatten(op)
-            vars = map(self._flatten, vars)
-            if indent_change < 0:
-                indent = max(0, indent + self.indent_amt * indent_change)
-            # TODO: make this a lot prettier
-            line = ((('%%-%ds' % indent) % pfx) + op + ' ' + ''.join(vars))
-            if semi:
-                line = line.rstrip() + ';'
-            out.append(line)
-            if indent_change > 0:
-                indent += self.indent_amt * indent_change
+        idx = 0
+        while idx < len(code):
+            opl, vl = 0, 0
+            flat = []
+            while idx < len(code):
+                pfx, op, vars, semi, indent_change = code[idx]
+                idx += 1
+                if indent_change: break
+                pfx, op = _flatten(pfx), _flatten(op)
+                vars = map(_flatten, vars)
+                if len(op) <= self.opm:
+                    opl = max(opl, len(op)+2)
+                for var in vars:
+                    if len(var) <= self.vm:
+                        vl = max(vl, len(var)+1)
+                flat.append((pfx, op, vars, semi))
+            for pfx, op, vars, semi in flat:
+                if pfx:
+                    line = ('%%-%ds ' % (indent-1)) % pfx
+                else:
+                    line = ' '*indent
+                line = ('%%-%ds ' % (indent+opl)) % (line+op)
+                for i, var in enumerate(vars):
+                    line = ('%%-%ds ' % (indent+opl+vl*(i+1))) % (line+var)
+                if semi:
+                    line = line.rstrip() + ';'
+                out.append(line)
+            indent = max(0, indent + self.idamt * indent_change)
         return '\n'.join(out)
 
 _TExp = namedtuple('_TExp', 'type exprlist')
diff --git a/main.py b/main.py
index 9ec52f1..99aed1a 100644
--- a/main.py
+++ b/main.py
@@ -21,12 +21,15 @@ from fr0stlib.pyflam3 import *
 from fr0stlib.pyflam3._flam3 import *
 from cuburnlib.render import *
 
-def main(genome_path):
+def main(args):
+    verbose = 1
+    if '-d' in args:
+        verbose = 3
     ctx = LaunchContext([MWCRNGTest], block=(256,1,1), grid=(64,1), tests=True)
-    ctx.compile(verbose=True)
+    ctx.compile(verbose=verbose)
     ctx.run_tests()
 
-    with open(genome_path) as fp:
+    with open(args[-1]) as fp:
         genomes = Genome.from_string(fp.read())
     render = Render(genomes)
     render.render_frame()
@@ -52,8 +55,8 @@ def main(genome_path):
     #pyglet.app.run()
 
 if __name__ == "__main__":
-    if len(sys.argv) < 2 or not os.path.isfile(sys.argv[1]):
-        print "First argument must be a path to a genome file"
+    if len(sys.argv) < 2 or not os.path.isfile(sys.argv[-1]):
+        print "Last argument must be a path to a genome file"
         sys.exit(1)
-    main(sys.argv[1])
+    main(sys.argv)