tcsh support

Adds basic supported for tcsh in response to
https://github.com/banga/powerline-shell/issues/299

README.md

@@ -1,7 +1,7 @@
 # A Powerline style prompt for your shell
 
 A [Powerline](https://github.com/Lokaltog/vim-powerline) like prompt for Bash,
-ZSH and Fish:
+ZSH, Fish, and tcsh:
 
 ![MacVim+Solarized+Powerline+CtrlP](https://raw.github.com/banga/powerline-shell/master/bash-powerline-screenshot.png)
 
@@ -132,6 +132,14 @@ function fish_prompt
 end
 ```
 
+### tcsh
+
+Add the following to your `.tcshrc`:
+
+```
+alias precmd 'set prompt="`powerline-shell --shell tcsh $?`"'
+```
+
 ## Customization
 
 ### Config File

powerline_shell/__init__.py

@@ -63,7 +63,8 @@ class Powerline(object):
     }
 
     color_templates = {
-        'bash': '\\[\\e%s\\]',
+        'bash': r'\[\e%s\]',
+        'tcsh': r'%%{\e%s%%}',
         'zsh': '%%{%s%%}',
         'bare': '%s',
     }
@@ -159,7 +160,7 @@ def main():
                             help='Generate the default config and print it to stdout')
     arg_parser.add_argument('--shell', action='store', default='bash',
                             help='Set this to your shell type',
-                            choices=['bash', 'zsh', 'bare'])
+                            choices=['bash', 'tcsh', 'zsh', 'bare'])
     arg_parser.add_argument('prev_error', nargs='?', type=int, default=0,
                             help='Error code returned by the last command')
     args = arg_parser.parse_args()

powerline_shell/segments/newline.py

@@ -1,8 +1,11 @@
-from ..utils import BasicSegment
+from ..utils import BasicSegment, warn
 
 
 class Segment(BasicSegment):
     def add_to_powerline(self):
+        if self.powerline.args.shell == "tcsh":
+            warn("newline segment not supported for tcsh (yet?)")
+            return
         self.powerline.append("\n",
                               self.powerline.theme.RESET,
                               self.powerline.theme.RESET,

powerline_shell/segments/root.py

@@ -6,6 +6,7 @@ class Segment(BasicSegment):
         powerline = self.powerline
         root_indicators = {
             'bash': ' \\$ ',
+            'tcsh': ' %# ',
             'zsh': ' %# ',
             'bare': ' $ ',
         }