New preview script.

preview.py

@@ -0,0 +1,99 @@
+import sys
+
+theme_keys = [
+    "cursor", "foreground", "background", "background_opacity", "dynamic_background_opacity", "dim_opacity",
+    "selection_foreground", "selection_background", "color0", "color8", "color1", "color9", "color2", "color10",
+    "color3", "color11", "color4", "color12", "color5", "color13", "color6", "color14", "color7", "color15"
+]
+
+
+def is_valid(line):
+    """
+    Returns true if a line inside a configuration file is a valid theme configuration pair: is not a comment, is not
+    empty and the key is correct.
+
+    :param line: a line inside the configuration file
+    :type line: str
+    :return: true if is valid, false otherwise
+    :rtype: bool
+    """
+    return (not line.lstrip().startswith("#")  # is not a comment
+            and len(line.strip()) != 0  # is not empty
+            and line.split(maxsplit=1)[0] in theme_keys)  # key is a valid one
+
+
+def extract_configuration_pair(line):
+    """
+    Extract a configuration pair by splitting on spaces and taking the first couple of values.
+
+    :param line: a line inside the configuration file
+    :type line: str
+    :return: a key-value pair
+    :rtype: bool
+    """
+    split = line.split(maxsplit=2)
+    return split[0], split[1]
+
+
+def read_configuration(filename):
+    """
+    Read a kitty configuration file and extract only theme related keys and values.
+
+    :param filename: path to the configuration file
+    :type filename: str
+    :return: a map with theme related configuration values
+    :rtype: dict[str, str]
+    """
+    with open(filename, "r") as fp:
+        lines = fp.readlines()
+        theme_config = dict([extract_configuration_pair(line) for line in lines if is_valid(line)])
+    return theme_config
+
+
+def fg(color, text):
+    rgb = tuple(int(color[i + 1:i + 3], 16) for i in (0, 2, 4))
+    return ('\x1b[38;2;%s;%s;%sm' % rgb + text + '\x1b[0m')
+
+
+def bg(color, text):
+    rgb = tuple(int(color[i + 1:i + 3], 16) for i in (0, 2, 4))
+    return ('\x1b[48;2;%s;%s;%sm' % rgb + text + '\x1b[0m')
+
+
+def print_preview(filename, configuration):
+    cursor = configuration["cursor"]
+    background = configuration["background"]
+    foreground = configuration["foreground"]
+
+    print(bg(background, "  "), end="")
+    print(bg(background, fg(foreground, filename)), end="")
+    print(bg(background, "  "), end="")
+
+    c='a'
+    for i in range(0, 16):
+        color = configuration["color%d" % i]
+        print(bg(background, fg(color, c)), end="")
+        c = chr(ord(c) + 1)
+
+    print(bg(background, "  "), end="")
+
+    selection_background = configuration["selection_background"]
+    selection_foreground = configuration["selection_foreground"]
+
+    c='A'
+    for i in range(0, 16):
+        print(bg(selection_background, fg(selection_foreground, c)), end="")
+        c = chr(ord(c) + 1)
+
+    print(bg(cursor, " "), end="")
+    print(bg(background, "  "), end="")
+    print()
+
+
+def main(filename):
+    configuration = read_configuration(filename)
+    print_preview(filename, configuration)
+
+
+if __name__ == "__main__":
+    main(sys.argv[1])