Add language kdl (#477)

* Add language_kdl

* [CI] Updated README.md and manifest.json.

* Add language_kdl to manifest

* [CI] Updated README.md and manifest.json.

---------

Co-authored-by: Github Actions <>

3 files changed, 96 insertions, 0 deletions

diff --git a/README.md b/README.md
index 6984ea4..136ab5e 100644
--- a/README.md
+++ b/README.md
@@ -257,6 +257,7 @@ to follow with `extra.follow_branch`.*
 | [`language_json`](plugins/language_json.lua?raw=1)                                                              | Syntax for the [JSON](https://www.json.org/json-en.html) language                                                                                                                   |
 | [`language_jsx`](plugins/language_jsx.lua?raw=1)                                                                | Syntax for the [JSX](https://reactjs.org/docs/introducing-jsx.html) language for the React framework in JavaScript                                                                  |
 | [`language_julia`](plugins/language_julia.lua?raw=1)                                                            | Syntax for the [Julia](https://julialang.org/) programming language                                                                                                                 |
+| [`language_kdl`](plugins/language_kdl.lua?raw=1)                                                                | Syntax for the [KDL](https://kdl.dev) document language                                                                                                                             |
 | [`language_kotlin`](plugins/language_kotlin.lua?raw=1)                                                          | Syntax for the [Kotlin](https://kotlinlang.org/docs/home.html) programming language                                                                                                 |
 | [`language_ksy`](https://raw.githubusercontent.com/whiteh0le/lite-plugins/main/plugins/language_ksy.lua?raw=1)* | Syntax for [Kaitai](http://kaitai.io/) struct files                                                                                                                                 |
 | [`language_lilypond`](plugins/language_lilypond.lua?raw=1)                                                      | Syntax for the [LilyPond](https://lilypond.org/) music typesetting language                                                                                                         |
diff --git a/manifest.json b/manifest.json
index 4fd7a35..e95b120 100644
--- a/manifest.json
+++ b/manifest.json
@@ -115,6 +115,7 @@
         "language_json": {},
         "language_jsx": {},
         "language_julia": {},
+        "language_kdl": {},
         "language_kotlin": {},
         "language_lilypond": {},
         "language_liquid": {},
@@ -1192,6 +1193,16 @@
       "version": "0.1"
     },
     {
+      "description": "Syntax for the [KDL](https://kdl.dev) document language",
+      "id": "language_kdl",
+      "mod_version": "3",
+      "path": "plugins/language_kdl.lua",
+      "tags": [
+        "language"
+      ],
+      "version": "0.1"
+    },
+    {
       "description": "Syntax for the [Kotlin](https://kotlinlang.org/docs/home.html) programming language",
       "id": "language_kotlin",
       "mod_version": "3",
diff --git a/plugins/language_kdl.lua b/plugins/language_kdl.lua
new file mode 100644
index 0000000..a08a0bb
--- /dev/null
+++ b/plugins/language_kdl.lua
@@ -0,0 +1,84 @@
+-- mod-version:3
+local syntax = require "core.syntax"
+
+local identifier = "\"?[^%d%s\\/%(%){}<>;%[%]=,\"][^%s\\/%(%){}<>;%[%]=,\"]*\"?"
+
+syntax.add {
+  name = "KDL",
+  files = { "%.kdl" },
+  space_handling = false,
+  comment = "//",
+  block_comment = {"/*", "*/"},
+  patterns = {
+    {
+		pattern = "^%s*".. identifier .."%s*",
+		type = "keyword"
+	},--
+    { pattern = "%s+",                      type = "normal"   },
+    {
+		pattern = "[{;]%s*()" .. identifier .. "%s*",
+		type = {"normal", "keyword"}
+	},--
+    { pattern = { "r#+\"", "\"#+" },         type = "string"   },
+    { pattern = { '"', '"', '\\' },          type = "string"   },
+    { pattern = "[%-+]?0x[%x_]+",            type = "number"   },
+    { pattern = "[%-+]?0b[01_]+",            type = "number"   },
+    { pattern = "[%-+]?0o[0-7_]+",           type = "number"   },
+    {
+		pattern = "[%-+]?[%d_]+%.[%d_]+e[%-+]?[%d_]+",
+		type = "number"
+	},
+	{ pattern = "[%-+]?[%d_]+%.[%d_]+",      type = "number"   },
+    { pattern = "[%-+]?[%d_]+e[%-+]?[%d_]+", type = "number"   },
+    { pattern = "[%-+]?[%d_]+",              type = "number"   },
+    { pattern = "/[%-/].-\n",                type = "comment"  },
+    { pattern = {"/%*", "%*/"},              type = "comment"  },
+    { pattern = identifier,                  type = "keyword2" },
+	{
+		pattern = "%(()" .. identifier .. "()%)",
+		type = {"normal", "function", "normal"}
+	},
+  },
+  symbols = {
+  	["null"]  = "literal",
+  	["true"]  = "literal",
+  	["false"] = "literal",
+  	["i8"]    = "function",
+  	["i32"]   = "function",
+  	["i16"]   = "function",
+  	["i64"]   = "function",
+  	["u8"]    = "function",
+  	["u32"]   = "function",
+  	["u16"]   = "function",
+  	["u64"]   = "function",
+  	["isize"]   = "function",
+  	["usize"]   = "function",
+  	["f32"]   = "function",
+  	["f64"]   = "function",
+  	["decimal64"]   = "function",
+  	["decimal128"]   = "function",
+  	["date-time"]   = "function",
+  	["time"]   = "function",
+  	["date"]   = "function",
+  	["duration"]   = "function",
+  	["decimal"]   = "function",
+  	["currency"]   = "function",
+  	["country-2"]   = "function",
+  	["country-3"]   = "function",
+  	["country-subdivision"]   = "function",
+  	["email"]   = "function",
+  	["idn-email"]   = "function",
+  	["hostname"]   = "function",
+  	["idn-hostname"]   = "function",
+  	["ipv4"]   = "function",
+  	["ipv6"]   = "function",
+  	["url"]   = "function",
+  	["url-reference"]   = "function",
+  	["irl"]   = "function",
+  	["irl-reference"]   = "function",
+  	["url-template"]   = "function",
+  	["uuid"]   = "function",
+  	["regex"]   = "function",
+  	["base64"]   = "function",
+  },
+}