Update modeline pattern to use github-linguist/linguist#5271

CHANGELOG.md

@@ -7,7 +7,10 @@ This project adheres to [Semantic Versioning](http://semver.org).
 [Staged]
 ------------------------------------------------------------------------
 * __Fixed:__ Conditional requests not highlighting the commands they run
-* __Fixed:__ Parameter highlighting terminated at the letter `R` in Atom 
+* __Fixed:__ Parameter highlighting terminated at the letter `R` in Atom
+* __Fixed:__ Various [inaccuracies][1] related to Roff modeline matching
+
+[1]: https://github.com/github/linguist/pull/5271
 
 
 [v1.3.1]

grammars/roff.cson

@@ -58,20 +58,20 @@ firstLineMatch: """(?x)
 	|
 	
 	# Modeline
-	(?i:
+	(?:
 		# Emacs
-		-\\*-(?:\\s*(?=[^:;\\s]+\\s*-\\*-)|(?:.*?[;\\s]|(?<=-\\*-))mode\\s*:\\s*)
-			[gnt]?roff
-		(?=[\\s;]|(?<![-*])-\\*-).*?-\\*-
+		-\\*-(?i:[ \\t]*(?=[^:;\\s]+[ \\t]*-\\*-)|(?:.*?[ \\t;]|(?<=-\\*-))[ \\t]*mode[ \\t]*:[ \\t]*)
+			(?i:[gnt]?roff)
+		(?=[ \\t;]|(?<![-*])-\\*-).*?-\\*-
 		
 		|
 		
 		# Vim
-		(?:(?:\\s|^)vi(?:m[<=>]?\\d+|m)?|\\sex)(?=:(?=\\s*set?\\s[^\\n:]+:)|:(?!\\s* set?\\s))
-		(?:(?:\\s|\\s*:\\s*)\\w*(?:\\s*=(?:[^\\n\\\\\\s]|\\\\.)*)?)*[\\s:]
-		(?:filetype|ft|syntax)\\s*=
-			[gnt]?roff
-		(?=\\s|:|$)
+		(?:(?:^|[ \\t])(?:vi|Vi(?=m))(?:m[<=>]?[0-9]+|m)?|[ \\t]ex)(?=:(?=[ \\t]*set?[ \\t][^\\r\\n:]+:)|:(?![ \\t]*set?[ \\t]))
+		(?:(?:[ \\t]*:[ \\t]*|[ \\t])\\w*(?:[ \\t]*=(?:[^\\\\\\s]|\\\\.)*)?)*[ \\t:]
+		(?:filetype|ft|syntax)[ \\t]*=
+			(?i:[gnt]?roff)
+		(?=$|\\s|:)
 	)
 """
 limitLineLength: no