plugin: generate diagrams from PlantUML code

Generate a UML diagram from PlantUML code within a Clojure file.

NOTE: no specific Neovim plugin is required, as PlantUML can be called from a Neovim key mapping

Create a <leader>lu key mapping to launch PlantUML (using OS exec path or specifying location of plantuml binary)

-- ------------------------------------------
-- Generate UML diagrams from PlantUML code
--
-- Requires PlantUML jar or binary
-- Shows image using OS image viewer
-- ------------------------------------------

if true then return {} end -- WARN: REMOVE THIS LINE TO ACTIVATE THIS FILE

---@type LazySpec
return {
  -- PlantUMl via external tool - key mapping
  {
    "AstroNvim/astrocore",
    opts = {
      mappings = {
        n = {

          -- shell to plantuml binary
          -- ["<Leader>lu"] = { ':silent exec "!plantuml % && open %:s,clj,png,"<CR>', desc = "UML diagram" },

          -- shell to java and plantuml jar (update path as required)
          ["<Leader>lu"] = {
            ':silent exec "!/usr/bin/java -jar ~/.local/share/plantuml/current.jar % && open %:s,clj,png,"<CR>',
            desc = "UML diagram",
          },
        },
      },
    },
  },
}

Start from the Astrocore mapping configuration for the Clojure files and review the supplied lu example, then verify how PlantUML is invoked through the configured binary or Java jar. Done means the mapping generates the diagram and opens the resulting image without requiring a specific Neovim plugin.