fmt: fix formatting multiline comments

vlib/v/fmt/comments.v

@@ -58,24 +58,22 @@ pub fn (mut f Fmt) comment(node ast.Comment, options CommentsOptions) {
 		}
 		f.write(out_s)
 	} else {
-		lines := node.text.trim_space().split_into_lines()
-		start_break := is_char_alphanumeric(node.text[0]) || node.text[0].is_space()
-		end_break := is_char_alphanumeric(node.text.trim('\t').bytes().last())
-			|| node.text.bytes().last().is_space()
+		lines := node.text.split_into_lines()
 		f.write('/*')
-		if start_break {
-			f.writeln('')
-		}
-		for line in lines {
-			f.writeln(line.trim_right(' '))
-			f.empty_line = false
-		}
-		if end_break {
-			f.empty_line = true
-		} else {
-			f.remove_new_line()
+		for i, line in lines {
+			if i == lines.len - 1 {
+				f.empty_line = false
+				if node.text[node.text.len - 1] == `\n` {
+					f.writeln(line)	
+				} else {
+					f.write(line)	
+				}
+				f.write('*/')
+			} else {
+				f.empty_line = false
+				f.writeln(line.trim_right(' '))
+			}
 		}
-		f.write('*/')
 	}
 	if options.level == .indent {
 		f.indent--

vlib/v/fmt/tests/comments_expected.vv

@@ -26,14 +26,14 @@ fn single_line_blocks() {
 }
 
 fn main() {
-	/*
-	block1
+	/* block1
 	*/
 	/*
-	block2
-	*/
+	block2 */
 	/*
+
 	block3
+
 	*/
 	a := 1 // this is a comment
 	d := c // and an extra one
@@ -52,16 +52,12 @@ fn insert_space() {
 }
 
 fn linebreaks_in_block_comments() {
-	/*
-	foo
+	/*foo
 	comment goes here!
-	bar
-	*/
-	/*
-	spam
+	bar*/
+	/*  spam
 	spaces make no difference there
-	eggs
-	*/
+	eggs */
 }
 
 fn between_if_branches() {

vlib/v/fmt/tests/consts_with_comments_expected.vv

@@ -5,8 +5,7 @@ const one = 1 // leave
 
 const two = 2
 
-/*
-move
+/* move
 */
 
 const three = 3 // rewrite and leave

vlib/v/fmt/tests/fn_headers_with_comments_expected.vv

@@ -7,6 +7,5 @@ fn C.Mix_LoadMUS3(file byteptr) voidptr // 1  2  3
 // Loads music
 fn C.Mix_LoadMUS4(file byteptr) voidptr
 
-/*
-Test
+/* Test
 */

vlib/v/fmt/tests/multiline_comment_2_keep.vv

@@ -0,0 +1,7 @@
+/*
+ *
+ * BRUH
+ *
+ */
+fn main() {
+}