Add custom indicator in root

Users can define custom indicators in root segment.

README.md

@@ -319,6 +319,10 @@ The options for the `time` segment are:
 
 - `format`: Format string as used by strftime function, e.g. `%H:%M`.
 
+The options for the `root` segment are:
+
+- `indicator`: Set custom indicator, e.g. ` → `.
+
 ### Contributing new types of segments
 
 The `powerline_shell/segments` directory contains python scripts which are

powerline_shell/segments/root.py

@@ -4,15 +4,20 @@
 class Segment(BasicSegment):
     def add_to_powerline(self):
         powerline = self.powerline
+        indicator = self._get_indicator(powerline.args.shell, powerline)
+        bg = powerline.theme.CMD_PASSED_BG
+        fg = powerline.theme.CMD_PASSED_FG
+        if powerline.args.prev_error != 0:
+            fg = powerline.theme.CMD_FAILED_FG
+            bg = powerline.theme.CMD_FAILED_BG
+        powerline.append(indicator, fg, bg, sanitize=False)
+
+    def _get_indicator(self, shell, powerline):
+        custom_indicator = powerline.segment_conf("root", "indicator", None)
         root_indicators = {
             'bash': ' \\$ ',
             'tcsh': ' %# ',
             'zsh': ' %# ',
             'bare': ' $ ',
         }
-        bg = powerline.theme.CMD_PASSED_BG
-        fg = powerline.theme.CMD_PASSED_FG
-        if powerline.args.prev_error != 0:
-            fg = powerline.theme.CMD_FAILED_FG
-            bg = powerline.theme.CMD_FAILED_BG
-        powerline.append(root_indicators[powerline.args.shell], fg, bg, sanitize=False)
+        return custom_indicator or root_indicators[shell]