Add scripts for generating UIColor definitions from colors defined in asset catalog

Colorsets/cp_if_different.sh

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+#!/bin/zsh
+#======================================================================================
+#         FILE: cp_if_different.sh
+#
+#        USAGE: cp_if_different.sh source_file target_file
+#
+#  DESCRIPTION: Copies the contents of the source_file to the target_file 
+#               if target_file content is different then source_file content.
+#               Useful for copying autogenerated Swift files to avoid 
+#               recompilations due to changes of file's modification date.
+#======================================================================================
+
+
+SOURCE_LOCATION=$1
+DESTINATION_LOCATION=$2
+
+if test -f $DESTINATION_LOCATION; then
+    if cmp --silent $SOURCE_LOCATION $DESTINATION_LOCATION; then
+        # files are identical
+        exit 0
+    else
+        # files are different
+        rm $DESTINATION_LOCATION
+    fi
+fi
+
+cp $SOURCE_LOCATION $DESTINATION_LOCATION

Colorsets/generate_uicolor_colorsets.sh

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+#!/bin/zsh
+
+GENERATED_FILE_LOCATION=`mktemp`
+COLORS_FILE_LOCATION="UIColor+Colorsets.swift"
+
+./uicolor_colorsets.py > $GENERATED_FILE_LOCATION
+./cp_if_different.sh $GENERATED_FILE_LOCATION $COLORS_FILE_LOCATION

Colorsets/uicolor_colorsets.py

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+#!/usr/bin/env python3
+
+"""UIColor colorset extension generator
+
+Searches recursively for *.colorset directories and generates Swift code
+containing color definitions via UIColor extension.
+"""
+
+import os
+import pathlib
+
+# find colors
+
+color_names = []
+
+for dirpath, dirnames, filenames in os.walk('.'):
+    pure_path = pathlib.PurePath(dirpath)
+    directory_name = pure_path.name
+    if '.colorset' in directory_name:
+        color_names.append(pure_path.stem)
+
+# build color definitions
+
+color_definitions = list(map(lambda x: "static let {} = UIColor(named: \"{}\")".format(x, x) , color_names))
+
+# compose file content
+
+file_content = "// ******** Autogenerated File ******** //\n\n"
+file_content += "import UIKit\n\n"
+file_content += "extension UIColor {\n\n"
+
+for color_definition in color_definitions:
+    file_content += "    " + color_definition + "!\n"
+
+file_content += "}"
+
+print(file_content)