Fixed colors in lxterminal. (raspbian and lubuntu)

lxterminal in lubuntu and raspbian is only taking 256 colors.
So when $TERM is "xterm" only 256 colors are used.

BUGS

@@ -244,14 +244,13 @@ Fixed
   workers.
 - gcc is not working inside the sandbox.
   <- Let /dev/null through the sandbox.
+- There is no color in lxterminal, only shades of grey.
 
 
 Won't fix
 - If the summary window is narrower then max_path_length the paths are never
   visible.
   <- Only a problem for very narrow windows.
-- There is no color in lxterminal, only shades of grey.
-  <- Only testing gnome-terminal & stterm at the moment.
 - Sometimes a lot (or all?) of the results are "?" even with correct statuses.
   <- Happens when the cache is deleted from underneath a running vigil.
 - In stterm the previous console title isn't being restored.

README.md

@@ -7,7 +7,7 @@ up to date as the codebase changes.
 
 ### Installation
 
-To run vigil:  (Tested in Ubuntu 16.10 in gnome-terminal and stterm)
+To run vigil: (Tested in Ubuntu 16.10 in gnome-terminal, lxterminal and stterm)
 
     # git clone https://github.com/ahamilton/vigil
     # cd vigil

make-readme.py

@@ -24,7 +24,7 @@ up to date as the codebase changes.
 
 ### Installation
 
-To run vigil:  (Tested in Ubuntu 16.10 in gnome-terminal and stterm)
+To run vigil: (Tested in Ubuntu 16.10 in gnome-terminal, lxterminal and stterm)
 
     # git clone https://github.com/ahamilton/vigil
     # cd vigil

terminal.py

@@ -24,30 +24,12 @@ save = ESC + "7"  # sc
 restore = ESC + "8"  # rc
 
 
-_FG_CODES = ["30", "31", "32", "33", "34", "35", "36", "37",
-             "90", "91", "92", "93", "94", "95", "96", "97"]
+def color(color_number, is_foreground):
+    return "\x1b[%s;5;%im" % ("38" if is_foreground else "48", color_number)
 
 
-def fg_color(color_number):  # setaf
-    return ("\x1b[38;5;%im" % color_number if color_number > 15
-            else "\x1b[%sm" % _FG_CODES[color_number])
-
-
-_BG_CODES = ["40", "41", "42", "43", "44", "45", "46", "47",
-             "100", "101", "102", "103", "104", "105", "106", "107"]
-
-
-def bg_color(color_number):  # setab
-    return ("\x1b[48;5;%im" % color_number if color_number > 15
-            else "\x1b[%sm" % _BG_CODES[color_number])
-
-
-def fg_rgb_color(rgb):
-    return "\x1b[38;2;%i;%i;%im" % rgb
-
-
-def bg_rgb_color(rgb):
-    return "\x1b[48;2;%i;%i;%im" % rgb
+def rgb_color(rgb, is_foreground):
+    return "\x1b[%s;2;" % ("38" if is_foreground else "48") + "%i;%i;%im" % rgb
 
 
 def move(x, y):  # cup

termstr.py

@@ -3,8 +3,11 @@
 # Licensed under the Artistic License 2.0.
 
 import collections
+import os
 import weakref
 
+import pygments.formatters.terminal256
+
 import terminal
 
 
@@ -35,6 +38,7 @@ class Color:
 class CharStyle:
 
     _POOL = weakref.WeakValueDictionary()
+    _TERMINAL256_FORMATTER = pygments.formatters.terminal256.Terminal256Formatter()
 
     def __new__(cls, fg_color=None, bg_color=None, is_bold=False,
                 is_italic=False, is_underlined=False):
@@ -66,18 +70,26 @@ class CharStyle:
         return ("<CharStyle: fg:%s bg:%s attr:%s>" %
                 (self.fg_color, self.bg_color, ",".join(attributes)))
 
+    def termcode_of_color(self, color, is_foreground):
+        if isinstance(color, int):
+            return terminal.color(color, is_foreground)
+        else:  # true color
+            if os.environ["TERM"] == "xterm":
+                closest_color = self._TERMINAL256_FORMATTER._closest_color(
+                    *color)
+                return terminal.color(closest_color, is_foreground)
+            else:
+                return terminal.rgb_color(color, is_foreground)
+
     @_cache_first_result
     def code_for_term(self):
-        fg_func = (terminal.fg_color if isinstance(self.fg_color, int)
-                   else terminal.fg_rgb_color)
-        bg_func = (terminal.bg_color if isinstance(self.bg_color, int)
-                   else terminal.bg_rgb_color)
+        fg_termcode = self.termcode_of_color(self.fg_color, True)
+        bg_termcode = self.termcode_of_color(self.bg_color, False)
         bold_code = terminal.bold if self.is_bold else ""
         italic_code = terminal.italic if self.is_italic else ""
         underline_code = terminal.underline if self.is_underlined else ""
-        return "".join([terminal.normal, fg_func(self.fg_color),
-                        bg_func(self.bg_color), bold_code, italic_code,
-                        underline_code])
+        return "".join([terminal.normal, fg_termcode, bg_termcode, bold_code,
+                        italic_code, underline_code])
 
 
 def _join_lists(lists):