feat: add builtin isortd formatter

lua/null-ls/builtins/formatting/isortd.lua

@@ -0,0 +1,53 @@
+local h = require("null-ls.helpers")
+local u = require("null-ls.utils")
+local methods = require("null-ls.methods")
+
+local FORMATTING = methods.internal.FORMATTING
+
+return h.make_builtin({
+    name = "isortd",
+    meta = {
+        url = "https://github.com/urm8/isortd",
+        description = "isortd is a small HTTP server that exposes isort’s functionality over a simple protocol. The main benefit of using it is to avoid the cost of starting up a new isort process every time you want to format a file.",
+        config = {
+            {
+                key = "hostname",
+                type = "string",
+                description = "Address that the isortd server listens on. Defaults to localhost.",
+            },
+            {
+                key = "port",
+                type = "string",
+                description = "Port that the isortd server listens on. Defaults to 47393.",
+            },
+        },
+    },
+    method = FORMATTING,
+    filetypes = { "python" },
+    generator = {
+        async = true,
+        fn = function(params, done)
+            local config = params:get_config()
+            local hostname = config.hostname or "localhost"
+            local port = config.port or 47393
+            local root = u.get_root()
+            local filepath = vim.api.nvim_buf_get_name(params.bufnr)
+            require("plenary.curl").post(hostname .. ":" .. port, {
+                body = table.concat(params.content, "\n"),
+                headers = {
+                    ["XX-SRC"] = root,
+                    ["XX-PATH"] = filepath,
+                },
+                callback = function(response)
+                    if response.status == 200 then
+                        return done({ { text = response.body } })
+                    else
+                        local log = require("null-ls.logger")
+                        log:error(string.format("error formatting with isortd %s %s", response.status, response.body))
+                    end
+                    return done()
+                end,
+            })
+        end,
+    },
+})