Added apply_style to pwarning()

Author: kmvanbrunt

CHANGELOG.md

@@ -7,6 +7,7 @@
     * Added capability to override the argument parser class used by cmd2 built-in commands. See override_parser.py
     example for more details.
     * Added `end` argument to `pfeedback()` to be consistent with the other print functions like `poutput()`.
+    * Added `apply_style` to `pwarning()`.
 * Breaking changes
     * For consistency between all the print functions:
         * Made `end` and `chop` keyword-only arguments of `ppaged()`

cmd2/cmd2.py

@@ -467,13 +467,17 @@ def perror(msg: Any, *, end: str = '\n', apply_style: bool = True) -> None:
             final_msg = "{}".format(msg)
         ansi.ansi_aware_write(sys.stderr, final_msg + end)
 
-    def pwarning(self, msg: Any, *, end: str = '\n') -> None:
-        """Apply the warning style to a message and print it to sys.stderr
+    def pwarning(self, msg: Any, *, end: str = '\n', apply_style: bool = True) -> None:
+        """Like perror, but applies ansi.style_warning by default
 
         :param msg: message to print (anything convertible to a str with '{}'.format() is OK)
         :param end: string appended after the end of the message, default a newline
+        :param apply_style: If True, then ansi.style_warning will be applied to the message text. Set to False in cases
+                            where the message text already has the desired style. Defaults to True.
         """
-        self.perror(ansi.style_warning(msg), end=end, apply_style=False)
+        if apply_style:
+            msg = ansi.style_warning(msg)
+        self.perror(msg, end=end, apply_style=False)
 
     def pexcept(self, msg: Any, *, end: str = '\n', apply_style: bool = True) -> None:
         """Print Exception message to sys.stderr. If debug is true, print exception traceback if one exists.
@@ -499,7 +503,6 @@ def pexcept(self, msg: Any, *, end: str = '\n', apply_style: bool = True) -> Non
             warning = "\nTo enable full traceback, run the following command: 'set debug true'"
             final_msg += ansi.style_warning(warning)
 
-        # Set apply_style to False since style has already been applied
         self.perror(final_msg, end=end, apply_style=False)
 
     def pfeedback(self, msg: Any, *, end: str = '\n') -> None:

tests/test_cmd2.py

@@ -1882,13 +1882,57 @@ def test_nonexistent_macro(base_app):
 
     assert exception is not None
 
+def test_perror_style(base_app, capsys):
+    msg = 'testing...'
+    end = '\n'
+    ansi.allow_ansi = ansi.ANSI_ALWAYS
+    base_app.perror(msg)
+    out, err = capsys.readouterr()
+    assert err == ansi.style_error(msg) + end
+
+def test_perror_no_style(base_app, capsys):
+    msg = 'testing...'
+    end = '\n'
+    ansi.allow_ansi = ansi.ANSI_ALWAYS
+    base_app.perror(msg, apply_style=False)
+    out, err = capsys.readouterr()
+    assert err == msg + end
+
+def test_pwarning_style(base_app, capsys):
+    msg = 'testing...'
+    end = '\n'
+    ansi.allow_ansi = ansi.ANSI_ALWAYS
+    base_app.pwarning(msg)
+    out, err = capsys.readouterr()
+    assert err == ansi.style_warning(msg) + end
+
+def test_pwarning_no_style(base_app, capsys):
+    msg = 'testing...'
+    end = '\n'
+    ansi.allow_ansi = ansi.ANSI_ALWAYS
+    base_app.pwarning(msg, apply_style=False)
+    out, err = capsys.readouterr()
+    assert err == msg + end
+
 def test_ppaged(outsim_app):
     msg = 'testing...'
     end = '\n'
     outsim_app.ppaged(msg)
     out = outsim_app.stdout.getvalue()
     assert out == msg + end
 
+def test_ppaged_blank(outsim_app):
+    msg = ''
+    outsim_app.ppaged(msg)
+    out = outsim_app.stdout.getvalue()
+    assert not out
+
+def test_ppaged_none(outsim_app):
+    msg = None
+    outsim_app.ppaged(msg)
+    out = outsim_app.stdout.getvalue()
+    assert not out
+
 def test_ppaged_strips_ansi_when_redirecting(outsim_app):
     msg = 'testing...'
     end = '\n'