first working version with breakable flowing nodes

patches/deprecated/merged-upstream/pre-Bucket_Game/mods/volcanic/LICENSE

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+MIT License
+
+Copyright (c) 2019 Poikilos (Jake Gustafson)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

patches/deprecated/merged-upstream/pre-Bucket_Game/mods/volcanic/README.md

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+# volcanic
+(minetest mod)
+
+Using worldedit, make permanent lava flow shapes.
+
+## Usage
+* select "lava fall" with worldedit
+* replace "default:lava_flowing" with "volcanic:crusted_lava_flowing"
+* replace "default:lava_source" with "volcanic:crusted_lava_source"
+
+## Licenses
+
+* Code: Open LICENCE file in your favorite text editor
+  (code from the Minetest default mod is trivial)
+* Lava Gel Texture
+  CC BY-SA 3.0
+  Attribution: Cisoun's texture pack, edited by Poikilos
+* Lava Gel Cool Lava Bucket Texture
+  based on:
+  - CC BY-SA 3.0 Lava from Cisoun's texture pack, edited by Poikilos
+  - (c) 2015-2019 and CC BY-SA 3.0: Realistic Bucket by ElementW, modified by Poikilos.

patches/deprecated/merged-upstream/pre-Bucket_Game/mods/volcanic/buckets.lua

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+if rawget(_G, "bucket") and bucket.register_liquid then
+    bucket.register_liquid(
+        "volcanic:crusted_lava_source",
+        "volcanic:crusted_lava_flowing",
+        "volcanic:bucket_crusted_lava",
+        "volcanic_bucket_crusted_lava.png",
+        "Crusted Lava Bucket"
+    )
+end

patches/deprecated/merged-upstream/pre-Bucket_Game/mods/volcanic/depends.txt

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+bucket?
+mesecons?

patches/deprecated/merged-upstream/pre-Bucket_Game/mods/volcanic/init.lua

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+dofile(minetest.get_modpath("volcanic").."/nodes.lua")
+dofile(minetest.get_modpath("volcanic").."/buckets.lua")
+dofile(minetest.get_modpath("volcanic").."/recipes.lua")

patches/deprecated/merged-upstream/pre-Bucket_Game/mods/volcanic/nodes.lua

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+-- exactly the same as lava_source and lava_flowing code from default, except:
+-- * names are changed
+-- * added liquid_range = 0
+-- * changed liquid_alternative_* params
+-- * removed igniter from groups
+minetest.register_node("volcanic:crusted_lava_source", {
+    description = "Crusted Lava Source",
+    drawtype = "liquid",
+    tiles = {
+        {
+            name = "volcanic_crusted_lava_source_animated.png",
+            animation = {
+                type = "vertical_frames",
+                aspect_w = 16,
+                aspect_h = 16,
+                length = 3.0,
+            },
+        },
+    },
+    special_tiles = {
+        -- New-style lava source material (mostly unused)
+        {
+            name = "volcanic_crusted_lava_source_animated.png",
+            animation = {
+                type = "vertical_frames",
+                aspect_w = 16,
+                aspect_h = 16,
+                length = 3.0,
+            },
+            backface_culling = false,
+        },
+    },
+    paramtype = "light",
+    light_source = default.LIGHT_MAX - 1,
+    walkable = true,
+    pointable = false,
+    diggable = false,
+    buildable_to = true,
+    is_ground_content = false,
+    drop = "",
+    drowning = 1,
+    liquidtype = "source",
+    liquid_alternative_flowing = "volcanic:crusted_lava_flowing",
+    liquid_alternative_source = "volcanic:crusted_lava_source",
+    liquid_range = 0,
+    liquid_viscosity = 7,
+    liquid_renewable = false,
+    damage_per_second = 2,  -- formerly 4 * 2
+    post_effect_color = {a = 191, r = 255, g = 64, b = 0},
+    groups = {lava = 3, liquid = 2, hot = 3},
+})
+minetest.register_node("volcanic:crusted_lava_flowing", {
+    description = "Flowing Crusted Lava",
+    drawtype = "flowingliquid",
+    tiles = {"volcanic_crusted_lava.png"},
+    special_tiles = {
+        {
+            name = "volcanic_crusted_lava_source_animated.png",  -- intentionally use source animation
+            backface_culling = false,
+            animation = {
+                type = "vertical_frames",
+                aspect_w = 16,
+                aspect_h = 16,
+                length = 3.3,
+            },
+        },
+        {
+            name = "volcanic_crusted_lava_source_animated.png",  -- intentionally use source animation
+            backface_culling = true,
+            animation = {
+                type = "vertical_frames",
+                aspect_w = 16,
+                aspect_h = 16,
+                length = 3.3,
+            },
+        },
+    },
+    paramtype = "light",
+    paramtype2 = "flowingliquid",
+    light_source = default.LIGHT_MAX - 1,
+    walkable = true,
+    pointable = true,
+    diggable = true,
+    buildable_to = true,
+    is_ground_content = false,
+    drop = 'default:cobble',
+    drowning = 1,
+    liquidtype = "none",
+    liquid_alternative_flowing = "volcanic:crusted_lava_flowing",
+    liquid_alternative_source = "volcanic:crusted_lava_source",
+    liquid_range = 0,
+    liquid_viscosity = 7,
+    liquid_renewable = false,
+    damage_per_second = 2,  -- formerly 4 * 2
+    post_effect_color = {a = 191, r = 255, g = 64, b = 0},
+    groups = {lava = 3, hot = 3,
+        not_in_creative_inventory = 1, crumbly = 3, cracky = 3},
+})

patches/deprecated/merged-upstream/pre-Bucket_Game/mods/volcanic/recipes.lua

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+local glue_fullname = nil
+
+if mesecons_materials then
+	glue_fullname = "mesecons_materials:glue"
+elseif technic then
+	glue_fullname = "technic:glue"
+end
+if glue_fullname then
+	minetest.register_craft({
+		type = "shapeless",
+		output = "volcanic:bucket_crusted_lava",
+		recipe = {"bucket:bucket_lava", glue_fullname},
+	})
+end