Optionally surface exceptions that happen under executors by reading

[python_utils.git] / ansi.py

diff --git a/ansi.py b/ansi.py
index 769b29c46b21c705f8c8ad09906f9dd7239cfaa2..9e31b811ab978fa1ae81c3974ba991700287d867 100755 (executable)
--- a/ansi.py
+++ b/ansi.py
@@ -8,6 +8,10 @@ import re
 import sys
 from typing import Any, Callable, Dict, Iterable, Optional, Tuple
 
+from overrides import overrides
+
+import logging_utils
+
 logger = logging.getLogger(__name__)
 
 # https://en.wikipedia.org/wiki/ANSI_escape_code
@@ -1726,15 +1730,32 @@ def _find_color_by_name(name: str) -> Tuple[int, int, int]:
     return rgb
 
 
-def fg(name: Optional[str] = "",
-       red: Optional[int] = None,
-       green: Optional[int] = None,
-       blue: Optional[int] = None,
-       *,
-       force_16color: bool = False,
-       force_216color: bool = False) -> str:
+@logging_utils.squelch_repeated_log_messages(1)
+def fg(
+    name: Optional[str] = "",
+    red: Optional[int] = None,
+    green: Optional[int] = None,
+    blue: Optional[int] = None,
+    *,
+    force_16color: bool = False,
+    force_216color: bool = False,
+) -> str:
+    """Return the ANSI escape sequence to change the foreground color
+    being printed.  Target colors may be indicated by name or R/G/B.
+    Result will use the 16 or 216 color scheme if force_16color or
+    force_216color are passed (respectively).  Otherwise the code will
+    do what it thinks best.
+
+    >>> import string_utils as su
+    >>> su.to_base64(fg('blue'))
+    b'G1szODs1OzIxbQ==\\n'
+
+    """
     import string_utils
 
+    if name is not None and name == 'reset':
+        return '\033[39m'
+
     if name is not None and string_utils.is_full_string(name):
         rgb = _find_color_by_name(name)
         return fg(
@@ -1743,7 +1764,7 @@ def fg(name: Optional[str] = "",
             rgb[1],
             rgb[2],
             force_16color=force_16color,
-            force_216color=force_216color
+            force_216color=force_216color,
         )
 
     if red is None:
@@ -1752,9 +1773,7 @@ def fg(name: Optional[str] = "",
         green = 0
     if blue is None:
         blue = 0
-    if (
-        is_16color(red) and is_16color(green) and is_16color(blue)
-    ) or force_16color:
+    if (is_16color(red) and is_16color(green) and is_16color(blue)) or force_16color:
         logger.debug("Using 16-color strategy")
         return fg_16color(red, green, blue)
     if (
@@ -1772,14 +1791,27 @@ def _rgb_to_yiq(rgb: Tuple[int, int, int]) -> int:
 
 def _contrast(rgb: Tuple[int, int, int]) -> Tuple[int, int, int]:
     if _rgb_to_yiq(rgb) < 128:
-        return (0xff, 0xff, 0xff)
+        return (0xFF, 0xFF, 0xFF)
     return (0, 0, 0)
 
 
-def pick_contrasting_color(name: Optional[str] = "",
-                           red: Optional[int] = None,
-                           green: Optional[int] = None,
-                           blue: Optional[int] = None) -> Tuple[int, int, int]:
+def pick_contrasting_color(
+    name: Optional[str] = "",
+    red: Optional[int] = None,
+    green: Optional[int] = None,
+    blue: Optional[int] = None,
+) -> Tuple[int, int, int]:
+    """This method will return a red, green, blue tuple representing a
+    contrasting color given the red, green, blue of a background
+    color or a color name of the background color.
+
+    >>> pick_contrasting_color(None, 20, 20, 20)
+    (255, 255, 255)
+
+    >>> pick_contrasting_color("white")
+    (0, 0, 0)
+
+    """
     import string_utils
 
     if name is not None and string_utils.is_full_string(name):
@@ -1797,11 +1829,7 @@ def guess_name(name: str) -> str:
     best_guess = None
     max_ratio = None
     for possibility in COLOR_NAMES_TO_RGB:
-        r = difflib.SequenceMatcher(
-            None,
-            name,
-            possibility
-        ).ratio()
+        r = difflib.SequenceMatcher(None, name, possibility).ratio()
         if max_ratio is None or r > max_ratio:
             max_ratio = r
             best_guess = possibility
@@ -1810,15 +1838,28 @@ def guess_name(name: str) -> str:
     return best_guess
 
 
-def bg(name: Optional[str] = "",
-       red: Optional[int] = None,
-       green: Optional[int] = None,
-       blue: Optional[int] = None,
-       *,
-       force_16color: bool = False,
-       force_216color: bool = False) -> str:
+def bg(
+    name: Optional[str] = "",
+    red: Optional[int] = None,
+    green: Optional[int] = None,
+    blue: Optional[int] = None,
+    *,
+    force_16color: bool = False,
+    force_216color: bool = False,
+) -> str:
+    """Returns an ANSI color code for changing the current background
+    color.
+
+    >>> import string_utils as su
+    >>> su.to_base64(bg("red"))    # b'\x1b[48;5;196m'
+    b'G1s0ODs1OzE5Nm0=\\n'
+
+    """
     import string_utils
 
+    if name is not None and name == 'reset':
+        return '\033[49m'
+
     if name is not None and string_utils.is_full_string(name):
         rgb = _find_color_by_name(name)
         return bg(
@@ -1827,7 +1868,7 @@ def bg(name: Optional[str] = "",
             rgb[1],
             rgb[2],
             force_16color=force_16color,
-            force_216color=force_216color
+            force_216color=force_216color,
         )
     if red is None:
         red = 0
@@ -1835,9 +1876,7 @@ def bg(name: Optional[str] = "",
         green = 0
     if blue is None:
         blue = 0
-    if (
-        is_16color(red) and is_16color(green) and is_16color(blue)
-    ) or force_16color:
+    if (is_16color(red) and is_16color(green) and is_16color(blue)) or force_16color:
         logger.debug("Using 16-color strategy")
         return bg_16color(red, green, blue)
     if (
@@ -1855,7 +1894,7 @@ class StdoutInterceptor(io.TextIOBase):
         self.buf = ''
 
     @abstractmethod
-    def write(self, s):
+    def write(self, s: str):
         pass
 
     def __enter__(self) -> None:
@@ -1870,10 +1909,14 @@ class StdoutInterceptor(io.TextIOBase):
 
 
 class ProgrammableColorizer(StdoutInterceptor):
-    def __init__(self, patterns: Iterable[Tuple[re.Pattern, Callable[[Any, re.Pattern], str]]]):
+    def __init__(
+        self,
+        patterns: Iterable[Tuple[re.Pattern, Callable[[Any, re.Pattern], str]]],
+    ):
         super().__init__()
         self.patterns = [_ for _ in patterns]
 
+    @overrides
     def write(self, s: str):
         for pattern in self.patterns:
             s = pattern[0].sub(pattern[1], s)
@@ -1881,7 +1924,12 @@ class ProgrammableColorizer(StdoutInterceptor):
 
 
 if __name__ == '__main__':
+
     def main() -> None:
+        import doctest
+
+        doctest.testmod()
+
         name = " ".join(sys.argv[1:])
         for possibility in COLOR_NAMES_TO_RGB:
             if name in possibility:
@@ -1890,6 +1938,9 @@ if __name__ == '__main__':
                 _ = pick_contrasting_color(possibility)
                 xf = fg(None, _[0], _[1], _[2])
                 xb = bg(None, _[0], _[1], _[2])
-                print(f'{f}{xb}{possibility}{reset()}\t\t\t'
-                      f'{b}{xf}{possibility}{reset()}')
+                print(
+                    f'{f}{xb}{possibility}{reset()}\t\t\t'
+                    f'{b}{xf}{possibility}{reset()}'
+                )
+
     main()