fix: trailers values and breaking changes values could be multilines (#77)

Ref: #76

Author: gbprod

grammar.js

@@ -11,9 +11,11 @@ const SCOPE = /[^\n\r\(\)]+/;
 const COMMENT = /[^\n\r]*\r?\n/;
 const COMMENT_TITLE = /[^\n\r:\uff1a]+[:\uff1a]\s*\r?\n/;
 const TRAILER_TOKEN = /[a-zA-Z-]+[ ]*[:\uff1a] /;
+const TRAILER_VALUE = /[^\n\r]+(\r?\n [^\n\r]+)*/;
 const GENERATED_COMMENT_TITLE = /[^\n\r:\uff1a]+[:\uff1a][ ]*/;
 const NUMBER = /\d+/;
 const BREAKING_CHANGE = /BREAKING[- ]CHANGE[ ]*[:\uff1a] /;
+const BREAKING_CHANGE_VALUE = /[^\n\r]+(\r?\n [^\n\r]+)*/;
 
 module.exports = grammar({
   name: 'gitcommit',
@@ -53,14 +55,17 @@ module.exports = grammar({
     message_line: () => seq(seq(NOT_A_COMMENT, ANYTHING_OR_NONE)),
 
     trailer: ($) =>
-      seq(alias(TRAILER_TOKEN, $.token), optional(alias(ANYTHING, $.value))),
+      seq(
+        alias(TRAILER_TOKEN, $.token),
+        optional(alias(TRAILER_VALUE, $.value))
+      ),
 
     breaking_change: ($) =>
       seq(
         // BREAKING_CHANGE conflicts with TRAILER_TOKEN, an so requires higher
         // lexical precedence
         alias(token(prec(1, BREAKING_CHANGE)), $.token),
-        optional(alias(ANYTHING, $.value))
+        optional(alias(BREAKING_CHANGE_VALUE, $.value))
       ),
 
     comment: ($) =>

src/grammar.json

@@ -91,7 +91,9 @@ BREAKING-CHANGE: also valid
 BREAKING CHANGE with overflow
 ================================================================================
 
-BREAKING CHANGE: My message with a long long text that will overflow with ease.
+BREAKING CHANGE: My message with a long long text
+ with more than one line
+ that should be parsed as a single value
 --------------------------------------------------------------------------------
 
 (source
@@ -105,9 +107,9 @@ Overflowed summary
 ================================================================================
 This is a simple subject
 
-This is a simple body 
+This is a simple body
 This is a simple body with so muche characters that it will overflow the summary limit
-This is a simple body 
+This is a simple body
 --------------------------------------------------------------------------------
 
 (source

src/parser.c

@@ -74,6 +74,7 @@ This is a simple subject
 
 key: This is a very long value, with spaces and
   newlines in it.
+  it should be parsed as a single value.
 
 --------------------------------------------------------------------------------
 
@@ -82,8 +83,7 @@ key: This is a very long value, with spaces and
   (message
     (trailer
       (token)
-      (value))
-    (message_line)))
+      (value))))
 
 ================================================================================
 Mixed