vfmt: fix string interpolation formatting with multiple ',",\' and \" .

cmd/tools/performance_compare.v

@@ -152,7 +152,7 @@ fn (c Context) compare_v_performance(label string, commands []string) string {
 		println(cmd)
 	}
 	for cmd in commands {
-		hyperfine_commands_arguments << " \'cd ${c.b:-34s} ; ./$cmd \' ".replace_each([
+		hyperfine_commands_arguments << ' \'cd ${c.b:-34s} ; ./$cmd \' '.replace_each([
 			'@COMPILER@',
 			source_location_b,
 			'@DEBUG@',
@@ -160,7 +160,7 @@ fn (c Context) compare_v_performance(label string, commands []string) string {
 		])
 	}
 	for cmd in commands {
-		hyperfine_commands_arguments << " \'cd ${c.a:-34s} ; ./$cmd \' ".replace_each([
+		hyperfine_commands_arguments << ' \'cd ${c.a:-34s} ; ./$cmd \' '.replace_each([
 			'@COMPILER@',
 			source_location_a,
 			'@DEBUG@',

vlib/builtin/string_test.v

@@ -792,8 +792,8 @@ fn test_raw_with_quotes() {
 
 fn test_escape() {
 	a := 10
-	println('\"$a')
+	println("\"$a")
-	assert '\"$a' == '"10'
+	assert "\"$a" == '"10'
 }
 
 fn test_atoi() {

vlib/v/checker/check_types.v

@@ -171,7 +171,7 @@ pub fn (mut c Checker) check_matching_function_symbols(got_type_sym &ast.TypeSym
 		if exp_arg_is_ptr != got_arg_is_ptr {
 			exp_arg_pointedness := if exp_arg_is_ptr { 'a pointer' } else { 'NOT a pointer' }
 			got_arg_pointedness := if got_arg_is_ptr { 'a pointer' } else { 'NOT a pointer' }
-			c.add_error_detail("`$exp_fn.name`\'s expected fn argument: `$exp_arg.name` is $exp_arg_pointedness, but the passed fn argument: `$got_arg.name` is $got_arg_pointedness")
+			c.add_error_detail('`$exp_fn.name`\'s expected fn argument: `$exp_arg.name` is $exp_arg_pointedness, but the passed fn argument: `$got_arg.name` is $got_arg_pointedness')
 			return false
 		}
 		if !c.check_basic(got_arg.typ, exp_arg.typ) {

vlib/v/fmt/fmt.v

@@ -2343,12 +2343,19 @@ pub fn (mut f Fmt) string_inter_literal(node ast.StringInterLiteral) {
 	// TODO: this code is very similar to ast.Expr.str()
 	mut quote := "'"
 	for val in node.vals {
-		if val.contains("'") {
+		if val.contains('\\"') {
 			quote = '"'
+			break
+		}
+		if val.contains("\\'") {
+			quote = "'"
+			break
 		}
 		if val.contains('"') {
 			quote = "'"
-			break
+		}
+		if val.contains("'") {
+			quote = '"'
 		}
 	}
 	f.write(quote)

vlib/v/fmt/tests/string_interpolation_complex_keep.vv

@@ -0,0 +1,9 @@
+struct Container {
+	id string
+}
+
+container := Container{}
+docker_pubkey := '1234657890'
+
+cmd := "docker exec $container.id sh -c 'echo \"$docker_pubkey\" >> ~/.ssh/authorized_keys'"
+println(cmd)

vlib/v/gen/js/js.v

@@ -938,7 +938,7 @@ fn (mut g JsGen) gen_for_in_stmt(it ast.ForInStmt) {
 			if it.kind == .string {
 				g.write('Array.from(')
 				g.expr(it.cond)
-				g.write(".str.split(\'\').entries(), ([$it.key_var, $val]) => [$it.key_var, ")
+				g.write('.str.split(\'\').entries(), ([$it.key_var, $val]) => [$it.key_var, ')
 				if g.ns.name == 'builtin' {
 					g.write('new ')
 				}

vlib/v/tests/interface_struct_test.v

@@ -8,7 +8,7 @@ struct Boss {
 }
 
 fn (b Boss) say_hello() string {
-	return "Hello, My name is $b.name and I\'m the bawz"
+	return 'Hello, My name is $b.name and I\'m the bawz'
 }
 
 fn (b Boss) speak(msg string) {

vlib/vweb/request_test.v

@@ -100,7 +100,7 @@ fn test_parse_multipart_form() {
 	file := 'bar.v'
 	ct := 'application/octet-stream'
 	contents := ['baz', 'buzz']
-	data := '--------------------------$boundary
+	data := "--------------------------$boundary
 Content-Disposition: form-data; name=\"${names[0]}\"; filename=\"$file\"
 Content-Type: $ct
 
@@ -110,7 +110,7 @@ Content-Disposition: form-data; name=\"${names[1]}\"
 
 ${contents[1]}
 --------------------------$boundary--
-'
+"
 	form, files := parse_multipart_form(data, boundary)
 	assert files == map{
 		names[0]: [FileData{

vlib/vweb/tests/vweb_test.v

@@ -213,12 +213,12 @@ fn test_http_client_multipart_form_data() ? {
 	name := 'foo'
 	ct := 'multipart/form-data; boundary=------------------------$boundary'
 	contents := 'baz buzz'
-	data := '--------------------------$boundary
+	data := "--------------------------$boundary
 Content-Disposition: form-data; name=\"$name\"
 
 $contents
 --------------------------$boundary--
-'
+"
 	mut x := http.fetch('http://127.0.0.1:$sport/form_echo',
 		method: .post
 		header: http.new_header(