Backport PR #521 on branch 3.x (PR: Add logic to handle traceback col…

…or configuration) (#523)

spyder_kernels/console/kernel.py

@@ -47,6 +47,7 @@
 from spyder_kernels.utils.mpl import automatic_backend, MPL_BACKENDS_TO_SPYDER
 from spyder_kernels.utils.nsview import (
     get_remote_data, make_remote_view, get_size)
+from spyder_kernels.utils.style import create_style_class
 from spyder_kernels.console.shell import SpyderShell
 from spyder_kernels.comms.utils import WriteContext
 
@@ -639,6 +640,8 @@ def set_configuration(self, conf):
                     ret["special_kernel_error"] = value
             elif key == "color scheme":
                 self.set_color_scheme(value)
+            elif key == "traceback_highlight_style":
+                self.set_traceback_syntax_highlighting(value)
             elif key == "jedi_completer":
                 self.set_jedi_completer(value)
             elif key == "greedy_completer":
@@ -657,13 +660,31 @@ def set_configuration(self, conf):
         return ret
 
     def set_color_scheme(self, color_scheme):
-        if color_scheme == "dark":
-            # Needed to change the colors of tracebacks
-            self.shell.run_line_magic("colors", "linux")
-            self.set_sympy_forecolor(background_color='dark')
-        elif color_scheme == "light":
-            self.shell.run_line_magic("colors", "lightbg")
-            self.set_sympy_forecolor(background_color='light')
+        self.shell.set_spyder_theme(color_scheme)
+        self.set_sympy_forecolor(background_color=color_scheme)
+        self.set_traceback_highlighting(color_scheme)
+
+    def set_traceback_highlighting(self, color_scheme):
+        """Set the traceback highlighting color."""
+        color = 'bg:ansired' if color_scheme == 'dark' else 'bg:ansiyellow'
+        from IPython.core.ultratb import VerboseTB
+
+        if getattr(VerboseTB, 'tb_highlight', None) is not None:
+            VerboseTB.tb_highlight = color
+        elif getattr(VerboseTB, '_tb_highlight', None) is not None:
+            VerboseTB._tb_highlight = color
+
+    def set_traceback_syntax_highlighting(self, syntax_style):
+        """Set the traceback syntax highlighting style."""
+        import IPython.core.ultratb
+        from IPython.core.ultratb import VerboseTB
+
+        IPython.core.ultratb.get_style_by_name = create_style_class
+
+        if getattr(VerboseTB, 'tb_highlight_style', None) is not None:
+            VerboseTB.tb_highlight_style = syntax_style
+        elif getattr(VerboseTB, '_tb_highlight_style', None) is not None:
+            VerboseTB._tb_highlight_style = syntax_style
 
     def get_cwd(self):
         """Get current working directory."""

spyder_kernels/console/shell.py

@@ -56,6 +56,7 @@ def __init__(self, *args, **kwargs):
         self._allow_kbdint = False
         self.register_debugger_sigint()
         self.update_gui_frontend = False
+        self._spyder_theme = 'dark'
 
         # register post_execute
         self.events.register('post_execute', self.do_post_execute)
@@ -84,6 +85,19 @@ def _showtraceback(self, etype, evalue, stb):
             stb = ['']
         super(SpyderShell, self)._showtraceback(etype, evalue, stb)
 
+    def set_spyder_theme(self, theme):
+        """Set the theme for the console."""
+        self._spyder_theme = theme
+        if theme == "dark":
+            # Needed to change the colors of tracebacks
+            self.run_line_magic("colors", "linux")
+        elif theme == "light":
+            self.run_line_magic("colors", "lightbg")
+
+    def get_spyder_theme(self):
+        """Get the theme for the console."""
+        return self._spyder_theme
+
     def enable_matplotlib(self, gui=None):
         """Enable matplotlib."""
         if gui is None or gui.lower() == "auto":

spyder_kernels/console/start.py

@@ -69,9 +69,6 @@ def kernel_config():
         # Don't load nor save history in our IPython consoles.
         spy_cfg.HistoryAccessor.enabled = False
 
-    # Until we implement Issue 1052
-    spy_cfg.InteractiveShell.xmode = 'Plain'
-
     # Jedi completer.
     jedi_o = os.environ.get('SPY_JEDI_O') == 'True'
     spy_cfg.IPCompleter.use_jedi = jedi_o

spyder_kernels/customize/code_runner.py

@@ -143,12 +143,14 @@ class SpyderCodeRunner(Magics):
     Functions and magics related to code execution, debugging, profiling, etc.
     """
     def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
         self.show_global_msg = True
         self.show_invalid_syntax_msg = True
         self.umr = UserModuleReloader(
-            namelist=os.environ.get("SPY_UMR_NAMELIST", None)
+            namelist=os.environ.get("SPY_UMR_NAMELIST", None),
+            shell=self.shell,
         )
-        super().__init__(*args, **kwargs)
 
     @runfile_arguments
     @needs_local_scope

spyder_kernels/customize/umr.py

@@ -20,7 +20,7 @@ class UserModuleReloader:
     namelist [list]: blacklist in terms of module name
     """
 
-    def __init__(self, namelist=None, pathlist=None):
+    def __init__(self, namelist=None, pathlist=None, shell=None):
         if namelist is None:
             namelist = []
         else:
@@ -45,6 +45,7 @@ def __init__(self, namelist=None, pathlist=None):
         self.namelist = namelist + spy_modules + mpl_modules + other_modules
 
         self.pathlist = pathlist
+        self._shell = shell
 
         # List of previously loaded modules
         self.previous_modules = list(sys.modules.keys())
@@ -92,7 +93,11 @@ def run(self):
         # Report reloaded modules
         if self.verbose and modnames_to_reload:
             modnames = modnames_to_reload
-            print("\x1b[4;33m%s\x1b[24m%s\x1b[0m"
-                  % ("Reloaded modules", ": "+", ".join(modnames)))
+            colors = {"dark": "33", "light": "31"}
+            color = colors["dark"]
+            if self._shell:
+                color = colors[self._shell.get_spyder_theme()]
+            content = ": "+", ".join(modnames)
+            print(f"\x1b[4;{color}mReloaded modules\x1b[24m{content}\x1b[0m")
 
         return modnames_to_reload

spyder_kernels/utils/style.py

@@ -0,0 +1,138 @@
+# -*- coding: utf-8 -*-
+# -----------------------------------------------------------------------------
+# Copyright (c) 2009- Spyder Kernels Contributors
+#
+# Licensed under the terms of the MIT License
+# (see spyder_kernels/__init__.py for details)
+# -----------------------------------------------------------------------------
+
+"""
+Style for IPython Console
+"""
+
+# Third party imports
+from pygments.style import Style
+from pygments.token import (
+    Name,
+    Keyword,
+    Comment,
+    String,
+    Number,
+    Punctuation,
+    Operator,
+)
+
+
+def create_pygments_dict(color_scheme_dict):
+    """
+    Create a dictionary that saves the given color scheme as a
+    Pygments style.
+    """
+
+    def give_font_weight(is_bold):
+        if is_bold:
+            return "bold"
+        else:
+            return ""
+
+    def give_font_style(is_italic):
+        if is_italic:
+            return "italic"
+        else:
+            return ""
+
+    color_scheme = color_scheme_dict
+
+    fon_c, fon_fw, fon_fs = color_scheme["normal"]
+    font_color = fon_c
+    font_font_weight = give_font_weight(fon_fw)
+    font_font_style = give_font_style(fon_fs)
+
+    key_c, key_fw, key_fs = color_scheme["keyword"]
+    keyword_color = key_c
+    keyword_font_weight = give_font_weight(key_fw)
+    keyword_font_style = give_font_style(key_fs)
+
+    bui_c, bui_fw, bui_fs = color_scheme["builtin"]
+    builtin_color = bui_c
+    builtin_font_weight = give_font_weight(bui_fw)
+    builtin_font_style = give_font_style(bui_fs)
+
+    str_c, str_fw, str_fs = color_scheme["string"]
+    string_color = str_c
+    string_font_weight = give_font_weight(str_fw)
+    string_font_style = give_font_style(str_fs)
+
+    num_c, num_fw, num_fs = color_scheme["number"]
+    number_color = num_c
+    number_font_weight = give_font_weight(num_fw)
+    number_font_style = give_font_style(num_fs)
+
+    com_c, com_fw, com_fs = color_scheme["comment"]
+    comment_color = com_c
+    comment_font_weight = give_font_weight(com_fw)
+    comment_font_style = give_font_style(com_fs)
+
+    def_c, def_fw, def_fs = color_scheme["definition"]
+    definition_color = def_c
+    definition_font_weight = give_font_weight(def_fw)
+    definition_font_style = give_font_style(def_fs)
+
+    ins_c, ins_fw, ins_fs = color_scheme["instance"]
+    instance_color = ins_c
+    instance_font_weight = give_font_weight(ins_fw)
+    instance_font_style = give_font_style(ins_fs)
+
+    font_token = font_font_style + " " + font_font_weight + " " + font_color
+    definition_token = (
+        definition_font_style
+        + " "
+        + definition_font_weight
+        + " "
+        + definition_color
+    )
+    builtin_token = (
+        builtin_font_style + " " + builtin_font_weight + " " + builtin_color
+    )
+    instance_token = (
+        instance_font_style + " " + instance_font_weight + " " + instance_color
+    )
+    keyword_token = (
+        keyword_font_style + " " + keyword_font_weight + " " + keyword_color
+    )
+    comment_token = (
+        comment_font_style + " " + comment_font_weight + " " + comment_color
+    )
+    string_token = (
+        string_font_style + " " + string_font_weight + " " + string_color
+    )
+    number_token = (
+        number_font_style + " " + number_font_weight + " " + number_color
+    )
+
+    syntax_style_dic = {
+        Name: font_token.strip(),
+        Name.Class: definition_token.strip(),
+        Name.Function: definition_token.strip(),
+        Name.Builtin: builtin_token.strip(),
+        Name.Builtin.Pseudo: instance_token.strip(),
+        Keyword: keyword_token.strip(),
+        Keyword.Type: builtin_token.strip(),
+        Comment: comment_token.strip(),
+        String: string_token.strip(),
+        Number: number_token.strip(),
+        Punctuation: font_token.strip(),
+        Operator.Word: keyword_token.strip(),
+    }
+
+    return syntax_style_dic
+
+
+def create_style_class(color_scheme_dict):
+    """Create a Pygments Style class with the given color scheme."""
+
+    class StyleClass(Style):
+        default_style = ""
+        styles = create_pygments_dict(color_scheme_dict)
+
+    return StyleClass