Added:

* DM (Dream Maker) language.
 * Sample DM file.

The DM language is used in an engine known as BYOND which allows users to easily create their own games in a language that is designed to be accessible for newcomers. I do not know how much a language has to be used on the site to be considered but searching for "BYOND" does show a lot of people using the language. I am also still learning git so if I have missed something then please let me know.

lib/linguist/languages.yml

@@ -344,6 +344,14 @@ DCPU-16 ASM:
 Diff:
   primary_extension: .diff
   
+DM:
+  type: programming
+  color: "#075ff1"
+  primary_extension: .dm
+  aliases:
+  - byond
+  
+
 Dylan:
   type: programming
   color: "#3ebc27"

samples/DM/example.dm

@@ -0,0 +1,79 @@
+// This is a single line comment.
+/*
+	This is a multi-line comment
+*/
+
+// Pre-processor keywords
+
+#define PI 3.1415
+
+#if PI == 4
+DoStuff()
+#elif PI == 3
+DoOtherStuff()
+#else
+DoNothing()
+#endif
+
+
+var/GlobalCounter = 0
+var/const/CONST_VARIABLE = 2
+var/list/MyList = list("anything", 1, new /datum/entity)
+var/list/EmptyList[99] // creates a list of 99 null entries
+var/list/NullList = null
+
+/*
+	Entity Class
+*/
+
+/datum/entity
+	var/name = "Entity"
+	var/number = 0
+
+/datum/entity/proc/myFunction()
+	world.log << "Entity has called myFunction"
+
+/datum/entity/New()
+	number = GlobalCounter++
+
+/*
+	Unit Class, Extends from Entity
+*/
+
+/datum/entity/unit
+	name = "Unit"
+
+/datum/entity/unit/New()
+	..() // calls the parent's proc; equal to super() and base() in other languages
+	number = rand(1, 99)
+
+/datum/entity/unit/myFunction()
+	world.log << "Unit has overriden and called myFunction"
+
+// Global Function
+/proc/ReverseList(var/list/input)
+	var/list/output = list()
+	for(var/i = input.len; i >= 1; i--) // IMPORTANT: List Arrays count from 1.
+		output += input[i] // "+= x" is ".Add(x)"
+	return output
+
+// Bitflags
+/proc/DoStuff()
+	var/bitflag = 0
+	bitflag |= 8
+	return bitflag
+
+/proc/DoOtherStuff()
+	var/bitflag = 65535 // 16 bits is the maximum amount
+	bitflag &= ~8
+	return bitflag
+
+// Logic
+/proc/DoNothing()
+	var/pi = PI
+	if(pi == 4)
+		world.log << "PI is 4"
+	else if(pi == CONST_VARIABLE)
+		world.log << "PI is [CONST_VARIABLE]!"
+	else
+		world.log << "PI is approximety [pi]"