Bridge discord formatting to IRC

Cargo.lock

@@ -183,6 +183,7 @@ dependencies = [
  "anyhow",
  "irc",
  "lazy_static",
+ "pulldown-cmark",
  "regex",
  "serde",
  "serenity",
@@ -381,6 +382,15 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "getopts"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14dbbfd5c71d70241ecf9e6f13737f7b5ce823821063188d7e46c41d371eebd5"
+dependencies = [
+ "unicode-width",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.1.16"
@@ -886,6 +896,18 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "pulldown-cmark"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34f197a544b0c9ab3ae46c359a7ec9cbbb5c7bf97054266fecb7ead794a181d6"
+dependencies = [
+ "bitflags",
+ "getopts",
+ "memchr",
+ "unicase",
+]
+
 [[package]]
 name = "quote"
 version = "1.0.10"
@@ -1450,6 +1472,12 @@ dependencies = [
  "tinyvec",
 ]
 
+[[package]]
+name = "unicode-width"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3ed742d4ea2bd1176e236172c8429aaf54486e7ac098db29ffe6529e0ce50973"
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.2"

Cargo.toml

@@ -12,6 +12,7 @@ toml = "0.5"
 serde = "1.0"
 regex = "1.5.4"
 lazy_static = "1.4"
+pulldown-cmark = "0.9.1"
 
 [dependencies.tokio]
 version = "1.15.0"

src/main.rs

@@ -25,6 +25,8 @@ use irc::{
 use lazy_static::lazy_static;
 use regex::Regex;
 
+use pulldown_cmark::Parser;
+
 use serde::Deserialize;
 
 #[derive(Deserialize)]
@@ -156,7 +158,27 @@ impl EventHandler for Handler {
             }
         }
 
-        let mut computed = msg.content.clone();
+        let mut computed = String::new();
+
+        {
+            use pulldown_cmark::Event::*;
+            use pulldown_cmark::Tag::*;
+            let parser = Parser::new(&msg.content);
+
+            for event in parser {
+                match event {
+                    Text(t) | Html(t) | Code(t) => computed.push_str(&t),
+                    End(_) => computed.push('\x0F'),
+                    Start(tag) => match tag {
+                        Emphasis => computed.push('\x1D'),
+                        Strong => computed.push('\x02'),
+                        Link(_, dest, _) => computed.push_str(&dest),
+                        _ => {}
+                    },
+                    _ => {}
+                }
+            }
+        }
 
         for mat in PING_RE_1.find_iter(&msg.content) {
             let slice = &msg.content[mat.start() + 2..mat.end() - 1];