Coding style

- Make modified CharStyles more easily.

termstr/termstr.py

@@ -118,6 +118,30 @@ class CharStyle:
             attributes.append("u")
         return f"<CharStyle: fg:{self.fg_color} bg:{self.bg_color} attr:{','.join(attributes)}>"
 
+    def bold(self):
+        return self.__class__(self.fg_color, self.bg_color, is_bold=True,
+                              is_italic=self.is_italic, is_underlined=self.is_underlined)
+
+    def underline(self):
+        return self.__class__(self.fg_color, self.bg_color, is_bold=self.is_bold,
+                              is_italic=self.is_italic, is_underlined=True)
+
+    def italic(self):
+        return self.__class__(self.fg_color, self.bg_color, is_bold=self.is_bold,
+                              is_italic=True, is_underlined=self.is_underlined)
+
+    def fg_color_(self, fg_color):
+        return self.__class__(fg_color, self.bg_color, is_bold=self.is_bold,
+                              is_italic=self.is_italic, is_underlined=self.is_underlined)
+
+    def bg_color_(self, bg_color):
+        return self.__class__(self.fg_color, bg_color, is_bold=self.is_bold,
+                              is_italic=self.is_italic, is_underlined=self.is_underlined)
+
+    def invert(self):
+        return self.__class__(self.bg_color, self.fg_color, is_bold=self.is_bold,
+                              is_italic=self.is_italic, is_underlined=self.is_underlined)
+
     @staticmethod
     def _color_code(color_, is_foreground):
         if isinstance(color_, int):
@@ -375,40 +399,22 @@ class TermStr(collections.UserString):
         return self.__class__(self.data, new_style)
 
     def bold(self):
-        def make_bold(style):
+        return self.transform_style(CharStyle.bold)
-            return CharStyle(style.fg_color, style.bg_color, is_bold=True,
-                             is_italic=style.is_italic, is_underlined=style.is_underlined)
-        return self.transform_style(make_bold)
 
     def underline(self):
-        def make_underlined(style):
+        return self.transform_style(CharStyle.underline)
-            return CharStyle(style.fg_color, style.bg_color, is_bold=style.is_bold,
-                             is_italic=style.is_italic, is_underlined=True)
-        return self.transform_style(make_underlined)
 
     def italic(self):
-        def make_italic(style):
+        return self.transform_style(CharStyle.italic)
-            return CharStyle(style.fg_color, style.bg_color, is_bold=style.is_bold,
-                             is_italic=True, is_underlined=style.is_underlined)
-        return self.transform_style(make_italic)
 
     def fg_color(self, fg_color):
-        def set_fgcolor(style):
+        return self.transform_style(lambda style: style.fg_color_(fg_color))
-            return CharStyle(fg_color, style.bg_color, is_bold=style.is_bold,
-                             is_italic=style.is_italic, is_underlined=style.is_underlined)
-        return self.transform_style(set_fgcolor)
 
     def bg_color(self, bg_color):
-        def set_bgcolor(style):
+        return self.transform_style(lambda style: style.bg_color_(bg_color))
-            return CharStyle(style.fg_color, bg_color, is_bold=style.is_bold,
-                             is_italic=style.is_italic, is_underlined=style.is_underlined)
-        return self.transform_style(set_bgcolor)
 
     def invert(self):
-        def invert_(style):
+        return self.transform_style(CharStyle.invert_)
-            return CharStyle(style.bg_color, style.fg_color, is_bold=style.is_bold,
-                             is_italic=style.is_italic, is_underlined=style.is_underlined)
-        return self.transform_style(invert_)
 
     def as_html(self):
         result = []