initial

lib/__init__.py

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+from .middleware.current_user import get_current_user

lib/middleware/current_user.py

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+from threading import local
+
+from django.utils.deprecation import MiddlewareMixin
+
+_user = local()
+_request = local()
+
+
+class CurrentUserMiddleware(MiddlewareMixin):
+    def process_request(self, request):
+        _user.value = request.user
+        _request.value = request
+
+
+def get_current_user():
+    try:
+        return _user.value
+    except AttributeError:
+        return None
+
+
+def get_current_request():
+    try:
+        return _request.value
+    except AttributeError:
+        return None

lib/utils.py

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+import logging
+import math
+import re
+
+import matplotlib
+from django.db import models
+from django.utils.safestring import mark_safe
+
+re_hex = re.compile("^([0-9a-f]{3,6})(\W)?", re.IGNORECASE)
+
+
+def hex2rgb(hexval):
+    return matplotlib.colors.to_rgb(hexval)
+
+
+def light_or_dark(rgbColor, colors: tuple = ('#FFFFFF', '#333333')):
+    if isinstance(rgbColor, str):
+        rgbColor = hex2rgb(rgbColor)
+    [r, g, b] = rgbColor
+    val = 0.299 * (r * r) + 0.587 * (g * g) + 0.114 * (b * b)
+    hsp = math.sqrt(val)
+    # logging.error([rgbColor, val, hsp])
+    # if hsp > 127.5:
+    if hsp > .5:
+        # light
+        return colors[1]
+    else:
+        # dark
+        return colors[0]
+
+
+def invert_hex(hexval: str):
+    def _invert(content):
+
+        text = content.group(1).lower()
+        code = {}
+        l1 = "0123456789abcdef"
+        l2 = "fedcba9876543210"
+        for i in range(len(l1)):
+            code[l1[i]] = l2[i]
+        inverted = ""
+        for j in text:
+            inverted += code[j]
+        return inverted
+
+    prepend_hash = ''
+    if hexval.startswith('#'):
+        hexval = hexval[1:]
+        prepend_hash = '#'
+    return prepend_hash + re_hex.sub(_invert, hexval)
+
+
+def color_label(instance: models.Model, value:str=None):
+    value = value or instance.color
+    return mark_safe(f'<div style="padding:.5em 1em;display:inline-block;background-color:{instance.color};border-radius:5px;'
+                     # f'color:{invert_hex(instance.color)};'
+                     f'color:{light_or_dark(instance.color)};'
+                     f'">{value}</div>')