Randomly colorize mxids

src/buffers/room.rs

@@ -52,7 +52,7 @@ use tokio::sync::oneshot;
 
 use super::{Buffer, BufferId, BufferItem, BufferItemContent, BufferSortKey, FullyReadStatus};
 use crate::config::Config;
-use crate::html::{escape_html, format_html};
+use crate::html::{escape_html, format_html, markup_colored_by_mxid};
 use crate::widgets::Prerender;
 
 /// Like [`BufferItemContent`] but owned.
@@ -98,6 +98,7 @@ impl DynamicUsage for OwnedBufferItemContent {
 }
 
 pub struct SingleClientRoomBuffer {
+  config: Arc<Config>,
   room_id: OwnedRoomId,
   client: Client,
 
@@ -178,7 +179,7 @@ impl SingleClientRoomBuffer {
             OwnedBufferItemContent::Text {
               event_id: event.event_id().map(ToOwned::to_owned),
               is_message: false,
-              text: format_html(&format!($($tokens)*))
+              text: format_html(&self.config, &format!($($tokens)*))
             }
           }
         }
@@ -189,7 +190,7 @@ impl SingleClientRoomBuffer {
             OwnedBufferItemContent::Text {
               event_id: event.event_id().map(ToOwned::to_owned),
               is_message: true,
-              text: format_html(&format!($($tokens)*))
+              text: format_html(&self.config, &format!($($tokens)*))
             }
           }
         }
@@ -201,6 +202,7 @@ impl SingleClientRoomBuffer {
             .strip_prefix('@')
             .expect("missing @ prefix"),
         );
+        let sender = markup_colored_by_mxid(&sender, &sender);
         match event.content() {
           Message(message) => match message.msgtype() {
             MessageType::Text(TextMessageEventContent {
@@ -293,6 +295,7 @@ impl SingleClientRoomBuffer {
                   .strip_prefix('@')
                   .expect("missing @ prefix"),
               );
+              let target = markup_colored_by_mxid(&target, &target);
               let Some(change_kind) = change.change() else {
                 return text!("--- {} made incomprehensible changes to {}", sender, target);
               };
@@ -480,6 +483,7 @@ impl RoomBuffer {
       items
     );
     self.buffers.push(SingleClientRoomBuffer {
+      config: self.config.clone(),
       room_id: self.room_id.clone(),
       client,
       timeline: Arc::new(timeline),

src/config.rs

@@ -147,9 +147,15 @@ pub struct BuflistStylesConfig {
   pub uneventful: StyleConfig,
 }
 
+#[derive(Clone, Debug, Deserialize)]
+pub struct UserStylesConfig {
+  pub rotation: Vec<StyleConfig>,
+}
+
 #[derive(Clone, Debug, Deserialize)]
 pub struct StylesConfig {
   pub buflist: BuflistStylesConfig,
+  pub users: UserStylesConfig,
 }
 
 #[derive(Clone, Debug, Deserialize)]

src/default_config.toml

@@ -61,17 +61,20 @@ unread_event = "bold"
 uneventful = ""
 
 # Style of usernames in chat logs
-[style.user.color]
-# Colors that can be assigned to users' names, picked semi-randomly
-colors = [
+[style.users]
+# Colors that can be assigned to users' names, picked semi-randomly.
+# Set an empty array to disable name coloration
+rotation = [
     "cyan",
-    "magenta",
+    "red",
     "green",
-    "brown",
-    "lightblue",
-    "default",
-    "lightcyan",
-    "lightmagenta",
-    "lightgreen",
     "blue",
+    "magenta",
+    "default",
+    "bold cyan",
+    "bold red",
+    "bold green",
+    "bold blue",
+    "bold magenta",
+    "bold default",
 ]

src/html/mod.rs

@@ -15,25 +15,50 @@
  */
 
 use std::borrow::Cow;
+use std::hash::{Hash, Hasher};
 use std::rc::Rc;
 
 use html5ever::driver::parse_fragment;
 use html5ever::interface::QualName;
 use html5ever::tendril::TendrilSink;
 use html5ever::{local_name, namespace_url, ns, Attribute};
-use html_escape::encode_text_minimal;
 use markup5ever_rcdom::{Handle, Node, NodeData, RcDom};
 use ratatui::style::{Color, Style, Stylize};
 use ratatui::text::{Line, Span, Text};
 
+use crate::config::Config;
+
 pub fn escape_html<S: ?Sized + AsRef<str>>(s: &S) -> Cow<'_, str> {
-  encode_text_minimal(s)
+  html_escape::encode_text_minimal(s)
+}
+
+pub fn markup_colored_by_mxid<M: ?Sized + AsRef<str>, C: ?Sized + AsRef<str>>(
+  mxid: &M,
+  content: &C,
+) -> String {
+  format!(
+    r#"<font data-ratatrix-colored-by-mxid="{}">{}</font>"#,
+    html_escape::encode_double_quoted_attribute(mxid),
+    content.as_ref()
+  )
 }
 
 fn count_digits(n: u16) -> u8 {
   f32::log10(n.into()).floor() as u8 + 1
 }
 
+fn get_color_by_mxid(config: &Config, mxid: &str) -> Option<Style> {
+  let rotation = &config.style.users.rotation;
+  if rotation.is_empty() {
+    None
+  } else {
+    let mut hasher = std::collections::hash_map::DefaultHasher::new();
+    mxid.hash(&mut hasher);
+    let color_id: usize = (hasher.finish() & (usize::MAX as u64)) as usize;
+    Some(*rotation[color_id % rotation.len()])
+  }
+}
+
 fn parse_hex_color(s: &str) -> Option<Color> {
   // Should we implement a workaround for https://github.com/ratatui-org/ratatui/issues/475
   // here, or wait for Crossterm to fix it?
@@ -67,6 +92,7 @@ struct FormatState {
 }
 
 fn format_tree(
+  config: &Config,
   tree: Rc<Node>,
   state: &mut FormatState,
   text: &mut Text<'static>,
@@ -134,6 +160,11 @@ fn format_tree(
                   state.style.bg = Some(color);
                 }
               },
+              "data-ratatrix-colored-by-mxid" => {
+                if let Some(style) = get_color_by_mxid(config, value.as_ref()) {
+                  state.style = state.style.patch(style);
+                }
+              },
               _ => {},
             },
             _ => {},
@@ -251,8 +282,13 @@ fn format_tree(
   };
 
   for subtree in tree.children.borrow().iter() {
-    previous_sibling_is_block =
-      format_tree(subtree.clone(), &mut state, text, previous_sibling_is_block);
+    previous_sibling_is_block = format_tree(
+      config,
+      subtree.clone(),
+      &mut state,
+      text,
+      previous_sibling_is_block,
+    );
   }
 
   match &tree.data {
@@ -278,7 +314,7 @@ fn format_tree(
   previous_sibling_is_block
 }
 
-pub fn format_html(s: &str) -> Text<'static> {
+pub fn format_html(config: &Config, s: &str) -> Text<'static> {
   let tree = parse_fragment(
     RcDom::default(),
     Default::default(),
@@ -292,6 +328,6 @@ pub fn format_html(s: &str) -> Text<'static> {
     ..Default::default()
   };
   let mut text = Text::raw("");
-  format_tree(tree, &mut state, &mut text, false);
+  format_tree(config, tree, &mut state, &mut text, false);
   text
 }