cgen: fix zero left padding (fix #24199) (#24201)

felipensp · web-flow · commit 36ec2355b2ed · 2025-04-13T11:46:48.000+03:00
diff --git a/vlib/builtin/string_interpolation.v b/vlib/builtin/string_interpolation.v
@@ -200,7 +200,7 @@ fn (data &StrIntpData) process_str_intp_data(mut sb strings.Builder) {
 	}
 
 	// align
-	if fmt_pad_ch == 0 {
+	if fmt_pad_ch == 0 || pad_ch == `0` {
 		match align {
 			0 { bf.align = .left }
 			1 { bf.align = .right }
diff --git a/vlib/v/tests/left_padding_test.v b/vlib/v/tests/left_padding_test.v
@@ -0,0 +1,10 @@
+module main
+
+fn test_main() {
+	// vfmt off
+	assert '[${8:-010}]' == '[8000000000]'
+	assert '[${8:010}]' == '[0000000008]'
+	assert '[${8:-10}]' == '[8         ]'
+	assert '[${8:10}]' == '[         8]'
+	// vfmt on
+}

Original file line number	Diff line number	Diff line change
`@@ -200,7 +200,7 @@ fn (data &StrIntpData) process_str_intp_data(mut sb strings.Builder) {`
`200`	`200`	`}`
`201`	`201`
`202`	`202`	`// align`
`203`		`- if fmt_pad_ch == 0 {`
	`203`	+ if fmt_pad_ch == 0 \|\| pad_ch == `0` {
`204`	`204`	`match align {`
`205`	`205`	`0 { bf.align = .left }`
`206`	`206`	`1 { bf.align = .right }`