fmt: move else branch of match expr to the end (#9766)

vlib/v/fmt/fmt.v

@@ -2054,30 +2054,7 @@ pub fn (mut f Fmt) map_init(node ast.MapInit) {
 	f.write('}')
 }
 
-pub fn (mut f Fmt) match_expr(node ast.MatchExpr) {
-	f.write('match ')
-	f.expr(node.cond)
-	if node.cond is ast.Ident {
-		f.it_name = node.cond.name
-	}
-	f.writeln(' {')
-	f.indent++
-	f.comments(node.comments, {})
-	mut single_line := true
-	for branch in node.branches {
-		if branch.stmts.len > 1 || branch.pos.line_nr < branch.pos.last_line {
-			single_line = false
-			break
-		}
-		if branch.stmts.len == 0 {
-			continue
-		}
-		if !stmt_is_single_line(branch.stmts[0]) {
-			single_line = false
-			break
-		}
-	}
-	for branch in node.branches {
+fn (mut f Fmt) match_branch(branch ast.MatchBranch, single_line bool) {
 	if !branch.is_else {
 		// normal branch
 		f.is_mbranch_expr = true
@@ -2118,6 +2095,41 @@ pub fn (mut f Fmt) match_expr(node ast.MatchExpr) {
 		}
 	}
 	f.comments(branch.post_comments, inline: true)
+}
+
+pub fn (mut f Fmt) match_expr(node ast.MatchExpr) {
+	f.write('match ')
+	f.expr(node.cond)
+	if node.cond is ast.Ident {
+		f.it_name = node.cond.name
+	}
+	f.writeln(' {')
+	f.indent++
+	f.comments(node.comments, {})
+	mut single_line := true
+	for branch in node.branches {
+		if branch.stmts.len > 1 || branch.pos.line_nr < branch.pos.last_line {
+			single_line = false
+			break
+		}
+		if branch.stmts.len == 0 {
+			continue
+		}
+		if !stmt_is_single_line(branch.stmts[0]) {
+			single_line = false
+			break
+		}
+	}
+	mut else_idx := -1
+	for i, branch in node.branches {
+		if branch.is_else {
+			else_idx = i
+			continue
+		}
+		f.match_branch(branch, single_line)
+	}
+	if else_idx >= 0 {
+		f.match_branch(node.branches[else_idx], single_line)
 	}
 	f.indent--
 	f.write('}')

vlib/v/fmt/tests/match_input.vv

@@ -2,8 +2,8 @@ fn match_expr_assignment() {
     a := 20
 	_ := match a {
 		10 { 10	}
-		5 {	5 }
 		else { 2 }
+		5 {	5 }
 	}
 }