prevent crash in setting sky color

if get color from name return nil

API.md

@@ -28,7 +28,9 @@ minetest.register_node("mymod:colored_node", {
 - "unifieddyes_palette_colorwallmounted.png"
 - or one of the "split" hues palettes (see below).
 
-`groups`: If your node can be colored by punching it with dye, its groups entry must contain the key ud_param2_colorable = 1, among whatever else you'd normally put there. If the node is software-controlled, as might be the case for some mesecons-digilines aware node, then this group key should be omitted.
+`groups`: If your node can be colored by using the airbrush, its groups entry must contain the key ud_param2_colorable = 1, among whatever else you'd normally put there. If the node is software-controlled, as might be the case for some mesecons-digilines aware node, then this group key should be omitted.
+
+If your node if of the kind where you need the split palette, but you need to put the *full color name* into the node name, as opposed to just the hue, then add the keys `ud_color_start` and `ud_color_end` and set them to the positions of the first and last characters of the color name (where 1 is the first character of the mod name at the start of the node name, i.e. "mymod:foo_bar_orange_baz" would have the start set to 15 and the end at 20).
 
 `on_construct`: see below.
 
@@ -115,12 +117,17 @@ This will loop through all of Unified Dyes' color lists, generating one recipe f
 
 `recipe` is the same as in the normal call, except that Unified Dyes will replace all instances of the string "NEUTRAL_NODE" with the item specified in the preceding `neutral_node` field.  Every instance of "MAIN_DYE" will be replaced with a portion of dye, as Unified Dyes' recipe helper works through its color lists (i.e. this field will become whatever dye is needed for each recipe).
 
-`output_prefix` and `output_suffix`, if specified (must use both if at all), will cause the recipe registration to ignore the usual `output` field, and instead set to the output item to `output_prefix` + (hue) + `output_suffix`.  Used for mods that use the split 89-color palette.  `hue` will thus be one of the 12 hues, or "grey", as defined by the split palettes.
+`output_prefix` and `output_suffix`, if specified (must use both if at all), will cause the recipe registration to set to the output item to `output_prefix` + (hue) + `output_suffix` + `output`.  Used for mods that use the split 89-color palette.  `hue` will thus be one of the 12 hues, or "grey", as defined by the split palettes.  In this situation, you can set `output` to your recipe yield (with a leading space) if needed.  For example, if the prefix is "foo:bar", the suffix is "baz", and the output is set to " 3", then the craft helper will generate output item strings of the form "foo:bar_COLOR_baz 3", for each color in the table.
 
 **`unifieddyes.make_colored_itemstack(itemstack, palette, color)`**
 
 Makes a colored itemstack out of the given `itemstack` and `color` (as a dye, e.g. "dye:dark_red_s50"), setting the correct index per the `palette` field, which works as described above for `unifieddyes.getpaletteidx()`.  Said itemstack is returned as a string suitable for use as the output field of a craft recipe, equal in size to the itemstack passed into the function (e.g. if you give it "mymod:colored_node 7", it'll return a stack of 7 colored items).
 
+**`unifieddyes.generate_split_palette_nodes(name, def, drop)`**
+
+Does just what it sounds like - it registers all the nodes that are needed for a given base node (`def`) to be able to use the split palette, each named according to `name`, with the palette hue appended.  If a custom drop is needed, it can be passed along (only a string is allowed here, specifying a single item).  
+
+
 #### Tables
 
 In addition to the above API calls, Unified Dyes provides several useful tables

colors.txt

@@ -1,90 +0,0 @@
-
-
-Full-saturation colors:
------------------------
-
-dark aqua                          0, 84, 42  unifieddyes_dark_aqua.png
-dark blue                          0,  0, 84  unifieddyes_dark_blue.png
-dark cyan                          0, 84, 83  unifieddyes_dark_cyan.png
-dark green                         0, 84,  0  unifieddyes_dark_green.png
-dark lime                         43, 84,  0  unifieddyes_dark_lime.png
-dark magenta                      84,  0, 83  unifieddyes_dark_magenta.png
-dark orange                       84, 42,  0  unifieddyes_dark_orange.png
-dark red                          84,  0,  0  unifieddyes_dark_red.png
-dark redviolet                    84,  0, 42  unifieddyes_dark_redviolet.png
-dark skyblue                       0, 42, 84  unifieddyes_dark_skyblue.png
-dark violet                       43,  0, 84  unifieddyes_dark_violet.png
-dark yellow                       84, 83,  0  unifieddyes_dark_yellow.png
-medium aqua                        0,169, 84  unifieddyes_medium_aqua.png
-medium blue                        0,  0,169  unifieddyes_medium_blue.png
-medium cyan                        0,169,167  unifieddyes_medium_cyan.png
-medium green                       0,169,  0  unifieddyes_medium_green.png
-medium lime                       87,169,  0  unifieddyes_medium_lime.png
-medium magenta                   169,  0,167  unifieddyes_medium_magenta.png
-medium orange                    169, 84,  0  unifieddyes_medium_orange.png
-medium red                       168,  0,  0  unifieddyes_medium_red.png
-medium redviolet                 169,  0, 84  unifieddyes_medium_redviolet.png
-medium skyblue                     0, 84,169  unifieddyes_medium_skyblue.png
-medium violet                     87,  0,169  unifieddyes_medium_violet.png
-medium yellow                    169,167,  0  unifieddyes_medium_yellow.png
-aqua                               1,255,127  unifieddyes_aqua.png
-blue                               1,  1,255  unifieddyes_blue.png
-cyan                               1,255,252  unifieddyes_cyan.png
-green                              1,255,  1  unifieddyes_green.png
-lime                             132,255,  1  unifieddyes_lime.png
-magenta                          255,  1,252  unifieddyes_magenta.png
-orange                           255,127,  1  unifieddyes_orange.png
-red                              255,  0,  0  unifieddyes_red.png
-redviolet                        255,  1,127  unifieddyes_redviolet.png
-skyblue                            1,127,255  unifieddyes_skyblue.png
-violet                           132,  1,255  unifieddyes_violet.png
-yellow                           255,252,  1  unifieddyes_yellow.png
-
-Low-saturation colors:
-----------------------
-
-dark aqua 50% saturation          21, 63, 42  unifieddyes_dark_aqua_s50.png
-dark blue 50% saturation          21, 21, 63  unifieddyes_dark_blue_s50.png
-dark cyan 50% saturation          21, 63, 63  unifieddyes_dark_cyan_s50.png
-dark green 50% saturation         21, 63, 21  unifieddyes_dark_green_s50.png
-dark lime 50% saturation          43, 63, 21  unifieddyes_dark_lime_s50.png
-dark magenta 50% saturation       63, 21, 63  unifieddyes_dark_magenta_s50.png
-dark orange 50% saturation        63, 42, 21  unifieddyes_dark_orange_s50.png
-dark red 50% saturation           63, 21, 21  unifieddyes_dark_red_s50.png
-dark redviolet 50% saturation     63, 21, 42  unifieddyes_dark_redviolet_s50.png
-dark skyblue 50% saturation       21, 42, 63  unifieddyes_dark_skyblue_s50.png
-dark violet 50% saturation        43, 21, 63  unifieddyes_dark_violet_s50.png
-dark yellow 50% saturation        63, 63, 21  unifieddyes_dark_yellow_s50.png
-medium aqua 50% saturation        42,126, 84  unifieddyes_medium_aqua_s50.png
-medium blue 50% saturation        42, 42,126  unifieddyes_medium_blue_s50.png
-medium cyan 50% saturation        42,126,126  unifieddyes_medium_cyan_s50.png
-medium green 50% saturation       42,126, 42  unifieddyes_medium_green_s50.png
-medium lime 50% saturation        86,126, 42  unifieddyes_medium_lime_s50.png
-medium magenta 50% saturation    126, 42,126  unifieddyes_medium_magenta_s50.png
-medium orange 50% saturation     126, 84, 42  unifieddyes_medium_orange_s50.png
-medium red 50% saturation        127, 42, 42  unifieddyes_medium_red_s50.png
-medium redviolet 50% saturation  126, 42, 84  unifieddyes_medium_redviolet_s50.png
-medium skyblue 50% saturation     42, 84,126  unifieddyes_medium_skyblue_s50.png
-medium violet 50% saturation      86, 42,126  unifieddyes_medium_violet_s50.png
-medium yellow 50% saturation     126,126, 42  unifieddyes_medium_yellow_s50.png
-aqua 50% saturation               65,191,127  unifieddyes_aqua_s50.png
-blue 50% saturation               65, 65,191  unifieddyes_blue_s50.png
-cyan 50% saturation               65,191,190  unifieddyes_cyan_s50.png
-green 50% saturation              65,191, 65  unifieddyes_green_s50.png
-lime 50% saturation              130,191, 65  unifieddyes_lime_s50.png
-magenta 50% saturation           191, 65,190  unifieddyes_magenta_s50.png
-orange 50% saturation            191,127, 65  unifieddyes_orange_s50.png
-red 50% saturation               192, 64, 64  unifieddyes_red_s50.png
-redviolet 50% saturation         191, 65,127  unifieddyes_redviolet_s50.png
-skyblue 50% saturation            65,127,191  unifieddyes_skyblue_s50.png
-violet 50% saturation            130, 65,191  unifieddyes_violet_s50.png
-yellow 50% saturation            191,190, 65  unifieddyes_yellow_s50.png
-
-Greyscale:
-----------
-
-black                              0,  0,  0  unifieddyes_black.png
-dark grey                         64, 64, 64  unifieddyes_darkgrey_paint.png
-medium grey                      128,128,128  unifieddyes_grey_paint.png
-light grey                       192,192,192  unifieddyes_lightgrey_paint.png
-white                            255,255,255  unifieddyes_white_paint.png