Add support for hyperlink escape sequence

This commit adds support for hyperlink escape sequence
`OSC 8 ; params ; URI ST`. The configuration option responsible for
those is `hints.enabled.hyperlinks`.

Fixes #922.

2 files changed, 86 insertions, 7 deletions

diff --git a/alacritty/src/config/color.rs b/alacritty/src/config/color.rs
index c0076edb..5028347c 100644
--- a/alacritty/src/config/color.rs
+++ b/alacritty/src/config/color.rs
@@ -18,15 +18,16 @@ pub struct Colors {
     pub line_indicator: LineIndicatorColors,
     pub hints: HintColors,
     pub transparent_background_colors: bool,
+    footer_bar: BarColors,
 }
 
 impl Colors {
-    pub fn search_bar_foreground(&self) -> Rgb {
-        self.search.bar.foreground.unwrap_or(self.primary.background)
+    pub fn footer_bar_foreground(&self) -> Rgb {
+        self.search.bar.foreground.or(self.footer_bar.foreground).unwrap_or(self.primary.background)
     }
 
-    pub fn search_bar_background(&self) -> Rgb {
-        self.search.bar.background.unwrap_or(self.primary.foreground)
+    pub fn footer_bar_background(&self) -> Rgb {
+        self.search.bar.background.or(self.footer_bar.background).unwrap_or(self.primary.foreground)
     }
 }
 
@@ -125,6 +126,7 @@ impl Default for InvertedCellColors {
 pub struct SearchColors {
     pub focused_match: FocusedMatchColors,
     pub matches: MatchColors,
+    #[config(deprecated = "use `colors.footer_bar` instead")]
     bar: BarColors,
 }
 
diff --git a/alacritty/src/config/ui_config.rs b/alacritty/src/config/ui_config.rs
index 74b61923..28139d27 100644
--- a/alacritty/src/config/ui_config.rs
+++ b/alacritty/src/config/ui_config.rs
@@ -1,10 +1,11 @@
 use std::cell::RefCell;
+use std::fmt::{self, Formatter};
 use std::path::PathBuf;
 use std::rc::Rc;
 
 use glutin::event::{ModifiersState, VirtualKeyCode};
 use log::error;
-use serde::de::Error as SerdeError;
+use serde::de::{Error as SerdeError, MapAccess, Visitor};
 use serde::{self, Deserialize, Deserializer};
 use unicode_width::UnicodeWidthChar;
 
@@ -236,6 +237,7 @@ impl Default for Hints {
         // Add URL hint by default when no other hint is present.
         let pattern = LazyRegexVariant::Pattern(String::from(URL_REGEX));
         let regex = LazyRegex(Rc::new(RefCell::new(pattern)));
+        let content = HintContent::new(Some(regex), true);
 
         #[cfg(not(any(target_os = "macos", windows)))]
         let action = HintAction::Command(Program::Just(String::from("xdg-open")));
@@ -249,7 +251,7 @@ impl Default for Hints {
 
         Self {
             enabled: vec![Hint {
-                regex,
+                content,
                 action,
                 post_processing: true,
                 mouse: Some(HintMouse { enabled: true, mods: Default::default() }),
@@ -332,7 +334,8 @@ pub enum HintAction {
 #[derive(Deserialize, Clone, Debug, PartialEq, Eq)]
 pub struct Hint {
     /// Regex for finding matches.
-    pub regex: LazyRegex,
+    #[serde(flatten)]
+    pub content: HintContent,
 
     /// Action executed when this hint is triggered.
     #[serde(flatten)]
@@ -349,6 +352,80 @@ pub struct Hint {
     binding: Option<HintBinding>,
 }
 
+#[derive(Default, Clone, Debug, PartialEq, Eq)]
+pub struct HintContent {
+    /// Regex for finding matches.
+    pub regex: Option<LazyRegex>,
+
+    /// Escape sequence hyperlinks.
+    pub hyperlinks: bool,
+}
+
+impl HintContent {
+    pub fn new(regex: Option<LazyRegex>, hyperlinks: bool) -> Self {
+        Self { regex, hyperlinks }
+    }
+}
+
+impl<'de> Deserialize<'de> for HintContent {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct HintContentVisitor;
+        impl<'a> Visitor<'a> for HintContentVisitor {
+            type Value = HintContent;
+
+            fn expecting(&self, f: &mut Formatter<'_>) -> fmt::Result {
+                f.write_str("a mapping")
+            }
+
+            fn visit_map<M>(self, mut map: M) -> Result<Self::Value, M::Error>
+            where
+                M: MapAccess<'a>,
+            {
+                let mut content = Self::Value::default();
+
+                while let Some((key, value)) = map.next_entry::<String, serde_yaml::Value>()? {
+                    match key.as_str() {
+                        "regex" => match Option::<LazyRegex>::deserialize(value) {
+                            Ok(regex) => content.regex = regex,
+                            Err(err) => {
+                                error!(
+                                    target: LOG_TARGET_CONFIG,
+                                    "Config error: hint's regex: {}", err
+                                );
+                            },
+                        },
+                        "hyperlinks" => match bool::deserialize(value) {
+                            Ok(hyperlink) => content.hyperlinks = hyperlink,
+                            Err(err) => {
+                                error!(
+                                    target: LOG_TARGET_CONFIG,
+                                    "Config error: hint's hyperlinks: {}", err
+                                );
+                            },
+                        },
+                        _ => (),
+                    }
+                }
+
+                // Require at least one of hyperlinks or regex trigger hint matches.
+                if content.regex.is_none() && !content.hyperlinks {
+                    return Err(M::Error::custom(
+                        "Config error: At least on of the hint's regex or hint's hyperlinks must \
+                         be set",
+                    ));
+                }
+
+                Ok(content)
+            }
+        }
+
+        deserializer.deserialize_any(HintContentVisitor)
+    }
+}
+
 /// Binding for triggering a keyboard hint.
 #[derive(Deserialize, Copy, Clone, Debug, PartialEq, Eq)]
 pub struct HintBinding {