Another overviewer configuration mockup idea

gistfile1.py

# Each render is declared by an entry in the renders dictionary. Tiles
# outputted go into a directory named by the dictionary key

# The following two declarations define renders for one world, but two
# rendermodes. They are both defined explicitly here and linked together below.
renders["world-smooth-lighting"] = {
        "name": "Day",
        "worldpath": "/opt/mc/server/world",
        "rendermode": "smooth-lighting"
        "north-direction": "upper-left",
        }

renders["world-smooth-night"] = {
        "name": "Night",
        "worldpath": "/opt/mc/server/world",
        "rendermode": "smooth-night"
        "north-direction": "upper-left",
        }

# The worldgroups dictionary maps world names to tile directories (which are
# the keys to the renders dictionary)
# This configures the interface. Each world name becomes an item in a drop down
# box, and each value given is represented by a button along the top of the
# page, whose text comes from the corresponding render's "name" attribute.
worldgroups = {
        "Creative World": ["world-smooth-lighting", "world-smooth-night"],
        }

# Declare another world to render, but with only one rendermode, and with different orientations
renders["survival-upper-left"] = {
        # No need for a "name" attribute since this is the only rendermode here
        "worldpath": "/opt/mc/server/survivalworld",
        "rendermode": "smooth-lighting"
        "north-direction": "upper-left",

        # The rotate-right attribute tells the interface to add a "clockwise"
        # button which, when clicked, displays this render. Similarly for
        # rotate-left
        "rotate-right": "survival-upper-right",
        "rotate-left": "survival-upper-left",
        }
renders["survival-upper-right"] = dict(renders["survival-upper-left"])
renders["survival-upper-right"]["north-direction"] = "upper-right"
renders["survival-upper-right"]["rotate-right"] = "lower-right"
renders["survival-upper-right"]["rotate-left"] = "upper-left"

renders["survival-lower-right"] = dict(renders["survival-upper-left"])
renders["survival-lower-right"]["north-direction"] = "lower-right"
renders["survival-lower-right"]["rotate-right"] = "lower-right"
renders["survival-lower-right"]["rotate-left"] = "upper-right"

renders["survival-lower-left"] = dict(renders["survival-upper-left"])
renders["survival-lower-left"]["north-direction"] = "lower-left"
renders["survival-lower-left"]["rotate-right"] = "upper-left"
renders["survival-lower-left"]["rotate-left"] = "lower-right"

# The above pattern could be simplified with a helper function such as:
renders["newcreative"] = {
        "worldpath": "/opt/mc/server/newworld",
        "rendermode": "smooth-lighting",
        "north-direction": "upper-left",
        }
create_other_orientations(renders,
        "newcreative",
        ["upper-left", "upper-right", "lower-left", "lower-right"]
        )
# That would create similar structs for each orientation, and append e.g.
# "-upper-left" to the end of the render name