[PATCH 5 of 5] ui: avoid needless casting to a str

[Gregory Szorc]

# HG changeset patch
# User Gregory Szorc <gregory.szorc at gmail.com>
# Date 1448232295 28800
#      Sun Nov 22 14:44:55 2015 -0800
# Node ID 5d5af88a927bbffa921f76f6600e0e67475df369
# Parent  e3c27c5cece623b52b053f84698446855e908396
ui: avoid needless casting to a str

In many cases, we don't need to cast to a str because the object will
be cast when it is eventually written.

As part of testing this, I added some code to raise exceptions when a
non-str was passed in and wasn't able to trigger it. i.e. we're already
passing str into this function everywhere, so the casting isn't
necessary.

diff --git a/hgext/color.py b/hgext/color.py
--- a/hgext/color.py
+++ b/hgext/color.py
@@ -433,18 +433,17 @@ class colorui(uimod.ui):
 
         label = opts.get('label', '')
         if self._buffers:
             if self._bufferapplylabels:
-                self._buffers[-1].extend(self.label(str(a), label)
-                                         for a in args)
+                self._buffers[-1].extend(self.label(a, label) for a in args)
             else:
-                self._buffers[-1].extend(str(a) for a in args)
+                self._buffers[-1].extend(args)
         elif self._colormode == 'win32':
             for a in args:
                 win32print(a, super(colorui, self).write, **opts)
         else:
             return super(colorui, self).write(
-                *[self.label(str(a), label) for a in args], **opts)
+                *[self.label(a, label) for a in args], **opts)
 
     def write_err(self, *args, **opts):
         if self._colormode is None:
             return super(colorui, self).write_err(*args, **opts)
@@ -456,9 +455,9 @@ class colorui(uimod.ui):
             for a in args:
                 win32print(a, super(colorui, self).write_err, **opts)
         else:
             return super(colorui, self).write_err(
-                *[self.label(str(a), label) for a in args], **opts)
+                *[self.label(a, label) for a in args], **opts)
 
     def showlabel(self, msg, label):
         if label and msg:
             if msg[-1] == '\n':
diff --git a/mercurial/ui.py b/mercurial/ui.py
--- a/mercurial/ui.py
+++ b/mercurial/ui.py
@@ -622,12 +622,12 @@ class ui(object):
         a label of "status.modified" for modified files.
         '''
         self._progclear()
         if self._buffers:
-            self._buffers[-1].extend([str(a) for a in args])
+            self._buffers[-1].extend(a for a in args)
         else:
             for a in args:
-                self.fout.write(str(a))
+                self.fout.write(a)
 
     def write_err(self, *args, **opts):
         self._progclear()
         try:
@@ -635,9 +635,9 @@ class ui(object):
                 return self.write(*args, **opts)
             if not getattr(self.fout, 'closed', False):
                 self.fout.flush()
             for a in args:
-                self.ferr.write(str(a))
+                self.ferr.write(a)
             # stderr may be buffered under win32 when redirected to files,
             # including stdout.
             if not getattr(self.ferr, 'closed', False):
                 self.ferr.flush()