vfmt: keep UnsafeExpr linebreacks as set by developer (#7558)

vlib/time/parse.v

@@ -39,8 +39,10 @@ pub fn parse_rfc2822(s string) ?Time {
 	unsafe {
 		tmstr = malloc(s.len * 2)
 	}
-	count := unsafe { C.snprintf(charptr(tmstr), (s.len * 2), '%s-%02d-%s %s', fields[3].str,
-		mm, fields[1].str, fields[4].str) }
+	count := unsafe {
+		C.snprintf(charptr(tmstr), (s.len * 2), '%s-%02d-%s %s', fields[3].str, mm, fields[1].str,
+			fields[4].str)
+	}
 	return parse(tos(tmstr, count))
 }
 
@@ -66,12 +68,16 @@ fn parse_iso8601_time(s string) ?(int, int, int, int, i64, bool) {
 	plus_min_z := `a`
 	offset_hour := 0
 	offset_minute := 0
-	mut count := unsafe { C.sscanf(charptr(s.str), '%2d:%2d:%2d.%6d%c%2d:%2d', &hour,
-		&minute, &second, &microsecond, charptr(&plus_min_z), &offset_hour, &offset_minute) }
+	mut count := unsafe {
+		C.sscanf(charptr(s.str), '%2d:%2d:%2d.%6d%c%2d:%2d', &hour, &minute, &second,
+			&microsecond, charptr(&plus_min_z), &offset_hour, &offset_minute)
+	}
 	// Missread microsecond ([Sec Hour Minute].len == 3 < 4)
 	if count < 4 {
-		count = unsafe { C.sscanf(charptr(s.str), '%2d:%2d:%2d%c%2d:%2d', &hour, &minute,
-			&second, charptr(&plus_min_z), &offset_hour, &offset_minute) }
+		count = unsafe {
+			C.sscanf(charptr(s.str), '%2d:%2d:%2d%c%2d:%2d', &hour, &minute, &second,
+				charptr(&plus_min_z), &offset_hour, &offset_minute)
+		}
 		count++ // Increment count because skipped microsecond
 	}
 	if count < 4 {

vlib/v/fmt/fmt.v

@@ -1111,8 +1111,22 @@ pub fn (mut f Fmt) expr(node ast.Expr) {
 			f.write(')')
 		}
 		ast.UnsafeExpr {
+			single_line := node.pos.line_nr >= node.pos.last_line
 			f.write('unsafe {')
+			if single_line {
+				f.write(' ')
+			} else {
+				f.writeln('')
+				f.indent++
+				f.empty_line = true
+			}
 			f.expr(node.expr)
+			if single_line {
+				f.write(' ')
+			} else {
+				f.writeln('')
+				f.indent--
+			}
 			f.write('}')
 		}
 	}

vlib/v/fmt/tests/unsafe_keep.vv

@@ -0,0 +1,17 @@
+fn main() {
+	unsafe {
+		println('hi')
+		println('hi2')
+	}
+	unsafe {
+		println('qwer')
+	}
+	unsafe { 6 }
+	x := unsafe {
+		5
+	}
+	y := unsafe { 7 }
+	unsafe {}
+	unsafe {
+	}
+}

vlib/v/parser/parser.v

@@ -2275,6 +2275,7 @@ fn (mut p Parser) unsafe_stmt() ast.Stmt {
 			// `unsafe {expr}`
 			if stmt.expr.is_expr() {
 				p.next()
+				pos.last_line = p.prev_tok.line_nr - 1
 				ue := ast.UnsafeExpr{
 					expr: stmt.expr
 					pos: pos
@@ -2293,7 +2294,6 @@ fn (mut p Parser) unsafe_stmt() ast.Stmt {
 	for p.tok.kind != .rcbr {
 		stmts << p.stmt(false)
 	}
-	pos.last_line = p.tok.line_nr
 	p.next()
 	return ast.Block{
 		stmts: stmts

vlib/v/parser/pratt.v

@@ -103,7 +103,7 @@ pub fn (mut p Parser) expr(precedence int) ast.Expr {
 		}
 		.key_unsafe {
 			// unsafe {
-			pos := p.tok.position()
+			mut pos := p.tok.position()
 			p.next()
 			if p.inside_unsafe {
 				p.error_with_pos('already inside `unsafe` block', pos)
@@ -111,11 +111,13 @@ pub fn (mut p Parser) expr(precedence int) ast.Expr {
 			}
 			p.inside_unsafe = true
 			p.check(.lcbr)
+			e := p.expr(0)
+			p.check(.rcbr)
+			pos.last_line = p.prev_tok.line_nr - 1
 			node = ast.UnsafeExpr{
-				expr: p.expr(0)
+				expr: e
 				pos: pos
 			}
-			p.check(.rcbr)
 			p.inside_unsafe = false
 		}
 		.key_lock, .key_rlock {