add missed hr tag support, minor reference api updates

src/app/browser/window/tab/item/page/content/text/markdown.rs

@@ -76,7 +76,7 @@ impl Markdown {
         let gutter = Gutter::build(&text_view);
 
         // Render markdown tags
-        let title = tags.render(&buffer, base, &link_color.0, &mut links, &mut headers);
+        let title = tags.render(&text_view, base, &link_color.0, &mut links, &mut headers);
 
         // Headers context menu (fragment capture)
         let action_header_copy_url =

src/app/browser/window/tab/item/page/content/text/markdown/tags.rs

@@ -1,6 +1,7 @@
 mod bold;
 mod code;
 mod header;
+mod hr;
 mod list;
 mod pre;
 mod quote;
@@ -11,10 +12,10 @@ mod underline;
 use bold::Bold;
 use code::Code;
 use gtk::{
-    TextBuffer, TextSearchFlags, TextTag,
+    TextSearchFlags, TextTag, TextView,
     gdk::RGBA,
     glib::{GString, Uri},
-    prelude::TextBufferExt,
+    prelude::{TextBufferExt, TextViewExt},
 };
 use header::Header;
 use pre::Pre;
@@ -54,31 +55,32 @@ impl Tags {
     }
     pub fn render(
         &mut self,
-        buffer: &TextBuffer,
+        text_view: &TextView,
         base: &Uri,
         link_color: &RGBA,
         links: &mut HashMap<TextTag, Uri>,
         headers: &mut HashMap<TextTag, (String, Uri)>,
     ) -> Option<String> {
+        let buffer = text_view.buffer();
+
         // Collect all code blocks first,
         // and temporarily replace them with placeholder ID
-        self.code.collect(buffer);
+        self.code.collect(&buffer);
 
         // Keep in order!
-        let title = self.header.render(buffer, base, headers);
+        let title = self.header.render(&buffer, base, headers);
 
-        list::render(buffer);
+        list::render(&buffer);
 
-        self.quote.render(buffer);
+        self.quote.render(&buffer);
 
-        self.bold.render(buffer);
+        self.bold.render(&buffer);
-        self.pre.render(buffer);
+        self.pre.render(&buffer);
-        self.strike.render(buffer);
+        self.strike.render(&buffer);
-        self.underline.render(buffer);
+        self.underline.render(&buffer);
 
-        reference::render_images_links(buffer, base, link_color, links);
+        reference::render(&buffer, base, link_color, links);
-        reference::render_images(buffer, base, link_color, links);
+        hr::render(text_view);
-        reference::render_links(buffer, base, link_color, links);
 
         // Cleanup unformatted escape chars
         for e in ESCAPE_ENTRIES {
@@ -94,11 +96,12 @@ impl Tags {
         }
 
         // Render placeholders
-        self.code.render(buffer);
+        self.code.render(&buffer);
 
         // Format document title string
         title.map(|mut s| {
             s = bold::strip_tags(&s);
+            s = hr::strip_tags(&s);
             s = pre::strip_tags(&s);
             s = reference::strip_tags(&s);
             s = strike::strip_tags(&s);
@@ -118,10 +121,13 @@ pub fn format_header_fragment(value: &str) -> GString {
 
 const ESCAPE_ENTRIES: &[&str] = &[
     "\\\n", "\\\\", "\\>", "\\`", "\\!", "\\[", "\\]", "\\(", "\\)", "\\*", "\\#", "\\~", "\\_",
+    "\\-",
 ];
 #[test]
 fn test_escape_entries() {
+    let mut set = std::collections::HashSet::new();
     for e in ESCAPE_ENTRIES {
-        assert_eq!(e.len(), 2)
+        assert_eq!(e.len(), 2);
+        assert!(set.insert(*e))
     }
 }

src/app/browser/window/tab/item/page/content/text/markdown/tags/hr.rs

@@ -0,0 +1,93 @@
+use gtk::{
+    Orientation, Separator, TextView,
+    glib::{ControlFlow, idle_add_local},
+    prelude::*,
+};
+use regex::Regex;
+
+const REGEX_HR: &str = r"(?m)^(?P<hr>\\?[-]{3,})$";
+
+/// Apply --- `Tag` to given `TextBuffer`
+pub fn render(text_view: &TextView) {
+    let separator = Separator::builder()
+        .orientation(Orientation::Horizontal)
+        .build();
+    idle_add_local({
+        let text_view = text_view.clone();
+        let separator = separator.clone();
+        move || {
+            separator.set_width_request(text_view.width() - 18);
+            ControlFlow::Break
+        }
+    });
+
+    let buffer = text_view.buffer();
+
+    let (start, end) = buffer.bounds();
+    let full_content = buffer.text(&start, &end, true).to_string();
+
+    let matches: Vec<_> = Regex::new(REGEX_HR)
+        .unwrap()
+        .captures_iter(&full_content)
+        .collect();
+
+    for cap in matches.into_iter().rev() {
+        let full_match = cap.get(0).unwrap();
+
+        let start_char_offset = full_content[..full_match.start()].chars().count() as i32;
+        let end_char_offset = full_content[..full_match.end()].chars().count() as i32;
+
+        let mut start_iter = buffer.iter_at_offset(start_char_offset);
+        let mut end_iter = buffer.iter_at_offset(end_char_offset);
+
+        if start_char_offset > 0
+            && buffer
+                .text(
+                    &buffer.iter_at_offset(start_char_offset - 1),
+                    &end_iter,
+                    false,
+                )
+                .contains("\\")
+        {
+            continue;
+        }
+
+        buffer.delete(&mut start_iter, &mut end_iter);
+        text_view.add_child_at_anchor(&separator, &buffer.create_child_anchor(&mut end_iter));
+    }
+}
+
+pub fn strip_tags(value: &str) -> String {
+    let mut result = String::from(value);
+    for cap in Regex::new(REGEX_HR).unwrap().captures_iter(value) {
+        if let Some(m) = cap.get(0) {
+            result = result.replace(m.as_str(), &cap["hr"]);
+        }
+    }
+    result
+}
+
+#[test]
+fn test_strip_tags() {
+    const VALUE: &str = "Some line\n---\nSome another-line with ![img](https://link.com)";
+    let mut result = String::from(VALUE);
+    for cap in Regex::new(REGEX_HR).unwrap().captures_iter(VALUE) {
+        if let Some(m) = cap.get(0) {
+            result = result.replace(m.as_str(), "");
+        }
+    }
+    assert_eq!(
+        result,
+        "Some line\n\nSome another-line with ![img](https://link.com)"
+    )
+}
+
+#[test]
+fn test_regex() {
+    let cap: Vec<_> = Regex::new(REGEX_HR)
+        .unwrap()
+        .captures_iter("Some line\n---\nSome another-line with ![img](https://link.com)")
+        .collect();
+
+    assert_eq!(&cap.first().unwrap()["hr"], "---");
+}

src/app/browser/window/tab/item/page/content/text/markdown/tags/reference.rs

@@ -106,7 +106,7 @@ impl Reference {
 }
 
 /// Image links `[![]()]()`
-pub fn render_images_links(
+fn render_images_links(
     buffer: &TextBuffer,
     base: &Uri,
     link_color: &RGBA,
@@ -159,8 +159,20 @@ pub fn render_images_links(
         }
     }
 }
+
+pub fn render(
+    buffer: &TextBuffer,
+    base: &Uri,
+    link_color: &RGBA,
+    links: &mut HashMap<TextTag, Uri>,
+) {
+    render_images_links(buffer, base, link_color, links);
+    render_images(buffer, base, link_color, links);
+    render_links(buffer, base, link_color, links)
+}
+
 /// Image tags `![]()`
-pub fn render_images(
+fn render_images(
     buffer: &TextBuffer,
     base: &Uri,
     link_color: &RGBA,
@@ -211,7 +223,7 @@ pub fn render_images(
     }
 }
 /// Links `[]()`
-pub fn render_links(
+fn render_links(
     buffer: &TextBuffer,
     base: &Uri,
     link_color: &RGBA,