bpo-36396: Remove fgBg param of idlelib.config.GetHighlight() (GH-12491)

This param was only used once and changed the return type.
(cherry picked from commit c1419578a1)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Lib/idlelib/NEWS.txt

@@ -3,6 +3,11 @@ Released on 2019-??-??
 ======================================
 
 
+bpo-36396: Remove fgBg param of idlelib.config.GetHighlight().
+This param was only used twice and changed the return type.
+
+bpo-23216: IDLE: Add docstrings to search modules.
+
 bpo-36176: Fix IDLE autocomplete & calltip popup colors.
 Prevent conflicts with Linux dark themes
 (and slightly darken calltip background).

Lib/idlelib/colorizer.py

@@ -40,7 +40,7 @@ def color_config(text):
     # Not automatic because ColorDelegator does not know 'text'.
     theme = idleConf.CurrentTheme()
     normal_colors = idleConf.GetHighlight(theme, 'normal')
-    cursor_color = idleConf.GetHighlight(theme, 'cursor', fgBg='fg')
+    cursor_color = idleConf.GetHighlight(theme, 'cursor')['foreground']
     select_colors = idleConf.GetHighlight(theme, 'hilite')
     text.config(
         foreground=normal_colors['foreground'],

Lib/idlelib/config.py

@@ -34,7 +34,6 @@ import idlelib
 
 class InvalidConfigType(Exception): pass
 class InvalidConfigSet(Exception): pass
-class InvalidFgBg(Exception): pass
 class InvalidTheme(Exception): pass
 
 class IdleConfParser(ConfigParser):
@@ -283,34 +282,20 @@ class IdleConf:
             raise InvalidConfigSet('Invalid configSet specified')
         return cfgParser.sections()
 
-    def GetHighlight(self, theme, element, fgBg=None):
-        """Return individual theme element highlight color(s).
+    def GetHighlight(self, theme, element):
+        """Return dict of theme element highlight colors.
 
-        fgBg - string ('fg' or 'bg') or None.
-        If None, return a dictionary containing fg and bg colors with
-        keys 'foreground' and 'background'.  Otherwise, only return
-        fg or bg color, as specified.  Colors are intended to be
-        appropriate for passing to Tkinter in, e.g., a tag_config call).
+        The keys are 'foreground' and 'background'.  The values are
+        tkinter color strings for configuring backgrounds and tags.
         """
-        if self.defaultCfg['highlight'].has_section(theme):
-            themeDict = self.GetThemeDict('default', theme)
-        else:
-            themeDict = self.GetThemeDict('user', theme)
-        fore = themeDict[element + '-foreground']
-        if element == 'cursor':  # There is no config value for cursor bg
-            back = themeDict['normal-background']
-        else:
-            back = themeDict[element + '-background']
-        highlight = {"foreground": fore, "background": back}
-        if not fgBg:  # Return dict of both colors
-            return highlight
-        else:  # Return specified color only
-            if fgBg == 'fg':
-                return highlight["foreground"]
-            if fgBg == 'bg':
-                return highlight["background"]
-            else:
-                raise InvalidFgBg('Invalid fgBg specified')
+        cfg = ('default' if self.defaultCfg['highlight'].has_section(theme)
+               else 'user')
+        theme_dict = self.GetThemeDict(cfg, theme)
+        fore = theme_dict[element + '-foreground']
+        if element == 'cursor':
+            element = 'normal'
+        back = theme_dict[element + '-background']
+        return {"foreground": fore, "background": back}
 
     def GetThemeDict(self, type, themeName):
         """Return {option:value} dict for elements in themeName.

Lib/idlelib/configdialog.py

@@ -1252,7 +1252,7 @@ class HighPage(Frame):
             colors = idleConf.GetHighlight(theme, element)
             if element == 'cursor':  # Cursor sample needs special painting.
                 colors['background'] = idleConf.GetHighlight(
-                        theme, 'normal', fgBg='bg')
+                        theme, 'normal')['background']
             # Handle any unsaved changes to this theme.
             if theme in changes['highlight']:
                 theme_dict = changes['highlight'][theme]

Lib/idlelib/idle_test/test_config.py

@@ -373,10 +373,6 @@ class IdleConfTest(unittest.TestCase):
         eq = self.assertEqual
         eq(conf.GetHighlight('IDLE Classic', 'normal'), {'foreground': '#000000',
                                                          'background': '#ffffff'})
-        eq(conf.GetHighlight('IDLE Classic', 'normal', 'fg'), '#000000')
-        eq(conf.GetHighlight('IDLE Classic', 'normal', 'bg'), '#ffffff')
-        with self.assertRaises(config.InvalidFgBg):
-            conf.GetHighlight('IDLE Classic', 'normal', 'fb')
 
         # Test cursor (this background should be normal-background)
         eq(conf.GetHighlight('IDLE Classic', 'cursor'), {'foreground': 'black',

Lib/idlelib/idle_test/test_configdialog.py

@@ -606,40 +606,35 @@ class HighPageTest(unittest.TestCase):
 
     def test_paint_theme_sample(self):
         eq = self.assertEqual
-        d = self.page
-        del d.paint_theme_sample
-        hs_tag = d.highlight_sample.tag_cget
+        page = self.page
+        del page.paint_theme_sample  # Delete masking mock.
+        hs_tag = page.highlight_sample.tag_cget
         gh = idleConf.GetHighlight
-        fg = 'foreground'
-        bg = 'background'
 
         # Create custom theme based on IDLE Dark.
-        d.theme_source.set(True)
-        d.builtin_name.set('IDLE Dark')
+        page.theme_source.set(True)
+        page.builtin_name.set('IDLE Dark')
         theme = 'IDLE Test'
-        d.create_new(theme)
-        d.set_color_sample.called = 0
+        page.create_new(theme)
+        page.set_color_sample.called = 0
 
         # Base theme with nothing in `changes`.
-        d.paint_theme_sample()
-        eq(hs_tag('break', fg), gh(theme, 'break', fgBg='fg'))
-        eq(hs_tag('cursor', bg), gh(theme, 'normal', fgBg='bg'))
-        self.assertNotEqual(hs_tag('console', fg), 'blue')
-        self.assertNotEqual(hs_tag('console', bg), 'yellow')
-        eq(d.set_color_sample.called, 1)
+        page.paint_theme_sample()
+        new_console = {'foreground': 'blue',
+                       'background': 'yellow',}
+        for key, value in new_console.items():
+            self.assertNotEqual(hs_tag('console', key), value)
+        eq(page.set_color_sample.called, 1)
 
         # Apply changes.
-        changes.add_option('highlight', theme, 'console-foreground', 'blue')
-        changes.add_option('highlight', theme, 'console-background', 'yellow')
-        d.paint_theme_sample()
+        for key, value in new_console.items():
+            changes.add_option('highlight', theme, 'console-'+key, value)
+        page.paint_theme_sample()
+        for key, value in new_console.items():
+            eq(hs_tag('console', key), value)
+        eq(page.set_color_sample.called, 2)
 
-        eq(hs_tag('break', fg), gh(theme, 'break', fgBg='fg'))
-        eq(hs_tag('cursor', bg), gh(theme, 'normal', fgBg='bg'))
-        eq(hs_tag('console', fg), 'blue')
-        eq(hs_tag('console', bg), 'yellow')
-        eq(d.set_color_sample.called, 2)
-
-        d.paint_theme_sample = Func()
+        page.paint_theme_sample = Func()
 
     def test_delete_custom(self):
         eq = self.assertEqual

Misc/NEWS.d/next/IDLE/2019-03-21-22-43-21.bpo-36396.xSTX-I.rst

@@ -0,0 +1,2 @@
+Remove fgBg param of idlelib.config.GetHighlight(). This param was only used
+twice and changed the return type.