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fix: bg:none overwrites foreground colour (#1903)
Changes the behaviour of a bg:none color string so that it causes the background to have no color instead of decoloring the entire string like it did before.
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@ -99,7 +99,7 @@ Style strings are a list of words, separated by whitespace. The words are not ca
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where `<color>` is a color specifier (discussed below). `fg:<color>` and `<color>` currently do the same thing , though this may change in the future. The order of words in the string does not matter.
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The `none` token overrides all other tokens in a string, so that e.g. `fg:red none fg:blue` will still create a string with no styling. It may become an error to use `none` in conjunction with other tokens in the future.
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The `none` token overrides all other tokens in a string if it is not part of a `bg:` specifier, so that e.g. `fg:red none fg:blue` will still create a string with no styling. `bg:none` sets the background to the default color so `fg:red bg:none` is equivalent to `red` or `fg:red` and `bg:green fg:red bg:none` is also equivalent to `fg:red` or `red`. It may become an error to use `none` in conjunction with other tokens in the future.
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A color specifier can be one of the following:
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@ -375,16 +375,31 @@ pub fn parse_style_string(style_string: &str) -> Option<ansi_term::Style> {
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"bold" => Some(style.bold()),
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"italic" => Some(style.italic()),
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"dimmed" => Some(style.dimmed()),
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"none" => None,
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// Try to see if this token parses as a valid color string
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color_string => parse_color_string(color_string).map(|ansi_color| {
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if col_fg {
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style.fg(ansi_color)
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// When the string is supposed to be a color:
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// Decide if we yield none, reset background or set color.
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color_string => {
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if color_string == "none" && col_fg {
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None // fg:none yields no style.
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} else {
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style.on(ansi_color)
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// Either bg or valid color or both.
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let parsed = parse_color_string(color_string);
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// bg + invalid color = reset the background to default.
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if !col_fg && parsed.is_none() {
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let mut new_style = style;
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new_style.background = Option::None;
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Some(new_style)
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} else {
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// Valid color, apply color to either bg or fg
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parsed.map(|ansi_color| {
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if col_fg {
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style.fg(ansi_color)
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} else {
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style.on(ansi_color)
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}
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})
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}
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}
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}),
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}
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}
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})
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})
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@ -684,6 +699,37 @@ mod tests {
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assert!(<Style>::from_config(&config).is_none());
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}
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#[test]
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fn table_get_styles_with_none() {
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// Test that none on the end will result in None, overriding bg:none
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let config = Value::from("fg:red bg:none none");
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assert!(<Style>::from_config(&config).is_none());
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// Test that none in front will result in None, overriding bg:none
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let config = Value::from("none fg:red bg:none");
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assert!(<Style>::from_config(&config).is_none());
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// Test that none in the middle will result in None, overriding bg:none
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let config = Value::from("fg:red none bg:none");
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assert!(<Style>::from_config(&config).is_none());
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// Test that fg:none will result in None
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let config = Value::from("fg:none bg:black");
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assert!(<Style>::from_config(&config).is_none());
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// Test that bg:none will yield a style
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let config = Value::from("fg:red bg:none");
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assert_eq!(<Style>::from_config(&config).unwrap(), Color::Red.normal());
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// Test that bg:none will yield a style
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let config = Value::from("fg:red bg:none bold");
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assert_eq!(<Style>::from_config(&config).unwrap(), Color::Red.bold());
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// Test that bg:none will overwrite the previous background colour
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let config = Value::from("fg:red bg:green bold bg:none");
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assert_eq!(<Style>::from_config(&config).unwrap(), Color::Red.bold());
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}
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#[test]
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fn table_get_styles_ordered() {
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// Test a background style with inverted order (also test hex + ANSI)
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