Add syntax mapping from NSE to Lua (#2214)

CHANGELOG.md

@@ -12,6 +12,8 @@
 
 ## Syntaxes
 
+- NSE (Nmap Scripting Engine) is mapped to Lua, see #2151 (@Cre3per)
+
 ## Themes
 
 ## `bat` as a library

src/syntax_mapping.rs

@@ -67,6 +67,11 @@ impl<'a> SyntaxMapping<'a> {
             .insert("*.pac", MappingTarget::MapTo("JavaScript (Babel)"))
             .unwrap();
 
+        // See #2151, https://nmap.org/book/nse-language.html
+        mapping
+            .insert("*.nse", MappingTarget::MapTo("Lua"))
+            .unwrap();
+
         // See #1008
         mapping
             .insert("rails", MappingTarget::MapToUnknown)

tests/syntax-tests/highlighted/NSE/test.nse

@@ -0,0 +1,34 @@
+--- Finds factorial of a number.
+-- @param value Number to find factorial.
+-- @return Factorial of number.
+local function factorial(value)
+    if value <= 1 then
+        return 1
+    else
+        return value * factorial(value - 1)
+    end
+end
+
+--- Joins a table of strings into a new string.
+-- @param table Table of strings.
+-- @param separator Separator character.
+-- @return Joined string.
+local function join(table, separator)
+    local data = ""
+    
+    for index, value in ipairs(table) do
+        data = data .. value .. separator
+    end
+    
+    data = data:sub(1, data:len() - 1)
+    
+    return data
+end
+
+local a = factorial(5)
+
+print(a)
+
+local b = join({ "l", "u", "a" }, ",")
+
+print(b)

tests/syntax-tests/source/NSE/test.nse

@@ -0,0 +1,34 @@
+--- Finds factorial of a number.
+-- @param value Number to find factorial.
+-- @return Factorial of number.
+local function factorial(value)
+    if value <= 1 then
+        return 1
+    else
+        return value * factorial(value - 1)
+    end
+end
+
+--- Joins a table of strings into a new string.
+-- @param table Table of strings.
+-- @param separator Separator character.
+-- @return Joined string.
+local function join(table, separator)
+    local data = ""
+    
+    for index, value in ipairs(table) do
+        data = data .. value .. separator
+    end
+    
+    data = data:sub(1, data:len() - 1)
+    
+    return data
+end
+
+local a = factorial(5)
+
+print(a)
+
+local b = join({ "l", "u", "a" }, ",")
+
+print(b)