Centralize plain text formatting at point of message sending.

Instead of relying on all parts of the application to construct both
HTML and plain-text responses, we now construct only HTML responses,
and convert the HTML to plain text right before sending the message to
Matrix.

This is a first iteration, because the plain text has a few extra
newlines than it should, created by use of nested <p> tags.

Cargo.lock

@@ -275,13 +275,14 @@ dependencies = [
  "dirs",
  "env_logger",
  "futures",
+ "html2text",
  "indoc",
  "itertools",
  "log",
  "matrix-sdk",
  "memmem",
  "nom",
- "phf",
+ "phf 0.7.24",
  "rand 0.7.3",
  "serde",
  "sled",
@@ -542,6 +543,16 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
 
+[[package]]
+name = "futf"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7c9c1ce3fa9336301af935ab852c437817d14cd33690446569392e65170aac3b"
+dependencies = [
+ "mac",
+ "new_debug_unreachable",
+]
+
 [[package]]
 name = "futures"
 version = "0.3.12"
@@ -767,6 +778,31 @@ dependencies = [
  "digest",
 ]
 
+[[package]]
+name = "html2text"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a26379dcb715e237b96102a12b505c553e2bffa74bae2e54658748d298660ef1"
+dependencies = [
+ "html5ever",
+ "markup5ever_rcdom",
+ "unicode-width",
+]
+
+[[package]]
+name = "html5ever"
+version = "0.25.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aafcf38a1a36118242d29b92e1b08ef84e67e4a5ed06e0a80be20e6a32bfed6b"
+dependencies = [
+ "log",
+ "mac",
+ "markup5ever",
+ "proc-macro2 1.0.24",
+ "quote 1.0.8",
+ "syn 1.0.60",
+]
+
 [[package]]
 name = "http"
 version = "0.2.3"
@@ -884,7 +920,7 @@ checksum = "61124eeebbd69b8190558df225adf7e4caafce0d743919e5d6b19652314ec5ec"
 dependencies = [
  "cfg-if 1.0.0",
  "js-sys",
- "time",
+ "time 0.2.25",
  "wasm-bindgen",
  "web-sys",
 ]
@@ -971,12 +1007,47 @@ dependencies = [
  "cfg-if 1.0.0",
 ]
 
+[[package]]
+name = "mac"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
+
 [[package]]
 name = "maplit"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3e2e65a1a2e43cfcb47a895c4c8b10d1f4a61097f9f254f183aee60cad9c651d"
 
+[[package]]
+name = "markup5ever"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aae38d669396ca9b707bfc3db254bc382ddb94f57cc5c235f34623a669a01dab"
+dependencies = [
+ "log",
+ "phf 0.8.0",
+ "phf_codegen",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "string_cache",
+ "string_cache_codegen",
+ "tendril",
+]
+
+[[package]]
+name = "markup5ever_rcdom"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f015da43bcd8d4f144559a3423f4591d69b8ce0652c905374da7205df336ae2b"
+dependencies = [
+ "html5ever",
+ "markup5ever",
+ "tendril",
+ "xml5ever",
+]
+
 [[package]]
 name = "matches"
 version = "0.1.8"
@@ -1135,6 +1206,12 @@ dependencies = [
  "tempfile",
 ]
 
+[[package]]
+name = "new_debug_unreachable"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e4a24736216ec316047a1fc4252e27dabb04218aa4a3f37c6e7ddbf1f9782b54"
+
 [[package]]
 name = "nom"
 version = "5.1.2"
@@ -1285,7 +1362,26 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b3da44b85f8e8dfaec21adae67f95d93244b2ecf6ad2a692320598dcc8e6dd18"
 dependencies = [
  "phf_macros",
- "phf_shared",
+ "phf_shared 0.7.24",
+]
+
+[[package]]
+name = "phf"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3dfb61232e34fcb633f43d12c58f83c1df82962dcdfa565a4e866ffc17dafe12"
+dependencies = [
+ "phf_shared 0.8.0",
+]
+
+[[package]]
+name = "phf_codegen"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cbffee61585b0411840d3ece935cce9cb6321f01c45477d30066498cd5e1a815"
+dependencies = [
+ "phf_generator 0.8.0",
+ "phf_shared 0.8.0",
 ]
 
 [[package]]
@@ -1294,18 +1390,28 @@ version = "0.7.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09364cc93c159b8b06b1f4dd8a4398984503483891b0c26b867cf431fb132662"
 dependencies = [
- "phf_shared",
+ "phf_shared 0.7.24",
  "rand 0.6.5",
 ]
 
+[[package]]
+name = "phf_generator"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17367f0cc86f2d25802b2c26ee58a7b23faeccf78a396094c13dced0d0182526"
+dependencies = [
+ "phf_shared 0.8.0",
+ "rand 0.7.3",
+]
+
 [[package]]
 name = "phf_macros"
 version = "0.7.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bdb45e833315153371697760dad1831da99ce41884162320305e4f123ca3fe37"
 dependencies = [
- "phf_generator",
+ "phf_generator 0.7.24",
- "phf_shared",
+ "phf_shared 0.7.24",
  "proc-macro2 0.4.30",
  "quote 0.6.13",
  "syn 0.15.44",
@@ -1317,7 +1423,16 @@ version = "0.7.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "234f71a15de2288bcb7e3b6515828d22af7ec8598ee6d24c3b526fa0a80b67a0"
 dependencies = [
- "siphasher",
+ "siphasher 0.2.3",
+]
+
+[[package]]
+name = "phf_shared"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c00cf8b9eafe68dde5e9eaa2cef8ee84a9336a47d566ec55ca16589633b65af7"
+dependencies = [
+ "siphasher 0.3.3",
 ]
 
 [[package]]
@@ -1405,6 +1520,12 @@ version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac74c624d6b2d21f425f752262f42188365d7b8ff1aff74c82e45136510a4857"
 
+[[package]]
+name = "precomputed-hash"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
+
 [[package]]
 name = "proc-macro-crate"
 version = "0.1.5"
@@ -1482,7 +1603,7 @@ dependencies = [
  "rand_isaac",
  "rand_jitter",
  "rand_os",
- "rand_pcg",
+ "rand_pcg 0.1.2",
  "rand_xorshift",
  "winapi",
 ]
@@ -1498,6 +1619,7 @@ dependencies = [
  "rand_chacha 0.2.2",
  "rand_core 0.5.1",
  "rand_hc 0.2.0",
+ "rand_pcg 0.2.1",
 ]
 
 [[package]]
@@ -1646,6 +1768,15 @@ dependencies = [
  "rand_core 0.4.2",
 ]
 
+[[package]]
+name = "rand_pcg"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "16abd0c1b639e9eb4d7c50c0b8100b0d0f849be2349829c740fe8e6eb4816429"
+dependencies = [
+ "rand_core 0.5.1",
+]
+
 [[package]]
 name = "rand_xorshift"
 version = "0.1.1"
@@ -2082,6 +2213,12 @@ version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b8de496cf83d4ed58b6be86c3a275b8602f6ffe98d3024a869e124147a9a3ac"
 
+[[package]]
+name = "siphasher"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa8f3741c7372e75519bd9346068370c9cdaabcc1f9599cbcf2a2719352286b7"
+
 [[package]]
 name = "slab"
 version = "0.4.2"
@@ -2185,6 +2322,31 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "213701ba3370744dcd1a12960caa4843b3d68b4d1c0a5d575e0d65b2ee9d16c0"
 
+[[package]]
+name = "string_cache"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ddb1139b5353f96e429e1a5e19fbaf663bddedaa06d1dbd49f82e352601209a"
+dependencies = [
+ "lazy_static",
+ "new_debug_unreachable",
+ "phf_shared 0.8.0",
+ "precomputed-hash",
+ "serde",
+]
+
+[[package]]
+name = "string_cache_codegen"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f24c8e5e19d22a726626f1a5e16fe15b132dcf21d10177fa5a45ce7962996b97"
+dependencies = [
+ "phf_generator 0.8.0",
+ "phf_shared 0.8.0",
+ "proc-macro2 1.0.24",
+ "quote 1.0.8",
+]
+
 [[package]]
 name = "subtle"
 version = "2.4.0"
@@ -2239,6 +2401,17 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "tendril"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9ef557cb397a4f0a5a3a628f06515f78563f2209e64d47055d9dc6052bf5e33"
+dependencies = [
+ "futf",
+ "mac",
+ "utf-8",
+]
+
 [[package]]
 name = "termcolor"
 version = "1.1.2"
@@ -2277,6 +2450,16 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "time"
+version = "0.1.43"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca8a50ef2360fbd1eeb0ecd46795a87a19024eb4b53c5dc916ca1fd95fe62438"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
 [[package]]
 name = "time"
 version = "0.2.25"
@@ -2485,6 +2668,12 @@ dependencies = [
  "tinyvec",
 ]
 
+[[package]]
+name = "unicode-width"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
+
 [[package]]
 name = "unicode-xid"
 version = "0.1.0"
@@ -2525,6 +2714,12 @@ dependencies = [
  "percent-encoding",
 ]
 
+[[package]]
+name = "utf-8"
+version = "0.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05e42f7c18b8f902290b009cde6d651262f956c98bc51bca4cd1d511c9cd85c7"
+
 [[package]]
 name = "uuid"
 version = "0.8.2"
@@ -2687,6 +2882,18 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "xml5ever"
+version = "0.16.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b1b52e6e8614d4a58b8e70cf51ec0cc21b256ad8206708bcff8139b5bbd6a59"
+dependencies = [
+ "log",
+ "mac",
+ "markup5ever",
+ "time 0.1.43",
+]
+
 [[package]]
 name = "zerocopy"
 version = "0.3.0"

Cargo.toml

@@ -29,6 +29,7 @@ byteorder = "1.3"
 futures = "0.3"
 memmem = "0.1"
 bincode = "1.3"
+html2text = "0.2"
 phf = { version = "0.7", features = ["macros"] }
 matrix-sdk = { git = "https://github.com/matrix-org/matrix-rust-sdk", branch = "master" }
 

src/bin/dicebot-cmd.rs

@@ -25,9 +25,8 @@ async fn main() -> Result<(), BotError> {
         message_body: &input,
     };
 
-    println!(
+    let message = command.execute(&context).await.message_html("fakeuser");
-        "{}",
+    let message = html2text::from_read(message.as_bytes(), 80);
-        command.execute(&context).await.message_plain("fakeuser")
+    println!("{}", message.trim());
-    );
     Ok(())
 }

src/bot.rs

@@ -3,19 +3,11 @@ use crate::config::*;
 use crate::context::{Context, RoomContext};
 use crate::db::Database;
 use crate::error::BotError;
+use crate::matrix;
 use crate::state::DiceBotState;
 use dirs;
-use log::{error, info};
+use log::info;
-use matrix_sdk::Error as MatrixError;
+use matrix_sdk::{self, identifiers::RoomId, Client, ClientConfig, JoinedRoom, SyncSettings};
-use matrix_sdk::{
-    self,
-    events::{
-        room::message::{MessageEventContent::Notice, NoticeMessageEventContent},
-        AnyMessageEventContent::RoomMessage,
-    },
-    identifiers::RoomId,
-    Client, ClientConfig, JoinedRoom, SyncSettings,
-};
 //use matrix_sdk_common_macros::async_trait;
 use std::clone::Clone;
 use std::path::PathBuf;
@@ -56,15 +48,6 @@ fn create_client(config: &Config) -> Result<Client, BotError> {
     Ok(Client::new_with_config(homeserver_url, client_config)?)
 }
 
-/// Extracts more detailed error messages out of a matrix SDK error.
-fn extract_error_message(error: MatrixError) -> String {
-    use matrix_sdk::Error::RumaResponse;
-    match error {
-        RumaResponse(ruma_error) => ruma_error.to_string(),
-        _ => error.to_string(),
-    }
-}
-
 /// Handle responding to a single command being executed. Wil print
 /// out the full result of that command.
 async fn handle_single_result(
@@ -73,16 +56,8 @@ async fn handle_single_result(
     respond_to: &str,
     room_id: &RoomId,
 ) {
-    let plain = cmd_result.message_plain(respond_to);
     let html = cmd_result.message_html(respond_to);
-
+    matrix::send_message(client, room_id, &html).await;
-    let response = RoomMessage(Notice(NoticeMessageEventContent::html(plain, html)));
-
-    let result = client.room_send(&room_id, response, None).await;
-    if let Err(e) = result {
-        let message = extract_error_message(e);
-        error!("Error sending message: {}", message);
-    };
 }
 
 /// Handle responding to multiple commands being executed. Will print
@@ -106,7 +81,7 @@ async fn handle_multiple_results(
     } else {
         let failures: String = errors
             .iter()
-            .map(|&(cmd, err)| format!("{}: {}", cmd, err))
+            .map(|&(cmd, err)| format!("<strong>{}:</strong> {}", cmd, err))
             .collect::<Vec<_>>()
             .join("\n");
 
@@ -117,18 +92,10 @@ async fn handle_multiple_results(
             errors.len(),
             failures
         )
+        .replace("\n", "<br/>")
     };
 
-    // TODO Need separate code that handles message formatting and
+    matrix::send_message(client, room_id, &message).await;
-    // sending so we aren't littering codebase with replace calls.
-    let html = message.replace("\n", "<br/>");
-    let response = RoomMessage(Notice(NoticeMessageEventContent::html(&message, &html)));
-
-    let result = client.room_send(&room_id, response, None).await;
-    if let Err(e) = result {
-        let message = extract_error_message(e);
-        error!("Error sending message: {}", message);
-    };
 }
 
 impl DiceBot {

src/commands.rs

@@ -23,22 +23,16 @@ pub enum CommandError {
 }
 
 /// A successfully executed command returns a message to be sent back
-/// to the user in both plain text and HTML, one of which will be
+/// to the user in HTML (plain text used as a fallback by message
-/// displayed in the user's client depending on its capabilities.
+/// formatter).
 #[derive(Debug)]
 pub struct Execution {
-    plain: String,
     html: String,
 }
 
 impl Execution {
-    pub fn new(plain: String, html: String) -> CommandResult {
+    pub fn new(html: String) -> CommandResult {
-        Ok(Execution { plain, html })
+        Ok(Execution { html })
-    }
-
-    /// Response message in plain text.
-    pub fn plain(&self) -> String {
-        self.plain.clone()
     }
 
     /// Response message in HTML.
@@ -47,10 +41,9 @@ impl Execution {
     }
 }
 
-/// Wraps a command execution failure. Provides plain-text and HTML
+/// Wraps a command execution failure. Provides HTML formatting for
-/// formatting for any error message from the BotError type, similar
+/// any error message from the BotError type, similar to how Execution
-/// to how Response provides formatting for successfully executed
+/// provides formatting for successfully executed commands.
-/// commands.
 #[derive(Error, Debug)]
 #[error("{0}")]
 pub struct ExecutionError(#[from] BotError);
@@ -62,11 +55,6 @@ impl From<crate::db::errors::DataError> for ExecutionError {
 }
 
 impl ExecutionError {
-    /// Error message in plain text.
-    pub fn plain(&self) -> String {
-        format!("{}", self.0)
-    }
-
     /// Error message in bolded HTML.
     pub fn html(&self) -> String {
         format!("<p><strong>{}</strong></p>", self.0)
@@ -80,29 +68,17 @@ pub type CommandResult = Result<Execution, ExecutionError>;
 /// Extract response messages out of a type, whether it is success or
 /// failure.
 pub trait ResponseExtractor {
-    /// Plain-text representation of the message, directly mentioning
-    /// the username.
-    fn message_plain(&self, username: &str) -> String;
-
     /// HTML representation of the message, directly mentioning the
     /// username.
     fn message_html(&self, username: &str) -> String;
 }
 
 impl ResponseExtractor for CommandResult {
-    /// Error message in plain text.
-    fn message_plain(&self, username: &str) -> String {
-        match self {
-            Ok(resp) => format!("{}\n{}", username, resp.plain()),
-            Err(e) => format!("{}\n{}", username, e.plain()),
-        }
-    }
-
     /// Error message in bolded HTML.
     fn message_html(&self, username: &str) -> String {
         match self {
-            Ok(resp) => format!("<p>{}</p>\n{}", username, resp.html).replace("\n", "<br/>"),
+            Ok(resp) => format!("<p>{}</p><p>{}</p>", username, resp.html).replace("\n", "<br/>"),
-            Err(e) => format!("<p>{}</p>\n{}", username, e.html()).replace("\n", "<br/>"),
+            Err(e) => format!("<p>{}</p><p>{}</p>", username, e.html()).replace("\n", "<br/>"),
         }
     }
 }

src/commands/basic_rolling.rs

@@ -14,12 +14,11 @@ impl Command for RollCommand {
 
     async fn execute(&self, _ctx: &Context<'_>) -> CommandResult {
         let roll = self.0.roll();
-        let plain = format!("Dice: {}\nResult: {}", self.0, roll);
         let html = format!(
             "<p><strong>Dice:</strong> {}</p><p><strong>Result</strong>: {}</p>",
             self.0, roll
         );
 
-        Execution::new(plain, html)
+        Execution::new(html)
     }
 }

src/commands/cofd.rs

@@ -15,12 +15,11 @@ impl Command for PoolRollCommand {
         let pool_with_ctx = DicePoolWithContext(&self.0, ctx);
         let rolled_pool = roll_pool(&pool_with_ctx).await?;
 
-        let plain = format!("Pool: {}\nResult: {}", rolled_pool, rolled_pool.roll);
         let html = format!(
             "<p><strong>Pool:</strong> {}</p><p><strong>Result</strong>: {}</p>",
             rolled_pool, rolled_pool.roll
         );
 
-        Execution::new(plain, html)
+        Execution::new(html)
     }
 }

src/commands/cthulhu.rs

@@ -15,13 +15,12 @@ impl Command for CthRoll {
         let roll_with_ctx = DiceRollWithContext(&self.0, ctx);
         let executed_roll = regular_roll(&roll_with_ctx).await?;
 
-        let plain = format!("Roll: {}\nResult: {}", executed_roll, executed_roll.roll);
         let html = format!(
             "<p><strong>Roll:</strong> {}</p><p><strong>Result</strong>: {}</p>",
             executed_roll, executed_roll.roll
         );
 
-        Execution::new(plain, html)
+        Execution::new(html)
     }
 }
 
@@ -36,12 +35,11 @@ impl Command for CthAdvanceRoll {
     async fn execute(&self, _ctx: &Context<'_>) -> CommandResult {
         //TODO this will be converted to a result when supporting variables.
         let roll = self.0.roll();
-        let plain = format!("Roll: {}\nResult: {}", self.0, roll);
         let html = format!(
             "<p><strong>Roll:</strong> {}</p><p><strong>Result</strong>: {}</p>",
             self.0, roll
         );
 
-        Execution::new(plain, html)
+        Execution::new(html)
     }
 }

src/commands/management.rs

@@ -25,9 +25,7 @@ impl Command for ResyncCommand {
         )
         .await?;
 
-        let plain = "Room information resynced".to_string();
+        let message = "Room information resynced.".to_string();
-        let html = "<p>Room information resynced.</p>".to_string();
+        Execution::new(message)
-
-        Execution::new(plain, html)
     }
 }

src/commands/misc.rs

@@ -17,8 +17,7 @@ impl Command for HelpCommand {
             _ => "There is no help for this topic",
         };
 
-        let plain = format!("Help: {}", help);
+        let html = format!("<strong>Help:</strong> {}", help.replace("\n", "<br/>"));
-        let html = format!("<p><strong>Help:</strong> {}", help.replace("\n", "<br/>"));
+        Execution::new(html)
-        Execution::new(plain, html)
     }
 }

src/commands/variables.rs

@@ -24,12 +24,11 @@ impl Command for GetAllVariablesCommand {
         variable_list.sort();
 
         let value = variable_list.join("\n");
-        let plain = format!("Variables:\n{}", value);
         let html = format!(
-            "<p><strong>Variables:</strong><br/>{}",
+            "<strong>Variables:</strong><br/>{}",
             value.replace("\n", "<br/>")
         );
-        Execution::new(plain, html)
+        Execution::new(html)
     }
 }
 
@@ -52,9 +51,8 @@ impl Command for GetVariableCommand {
             Err(e) => return Err(e.into()),
         };
 
-        let plain = format!("Variable: {}", value);
+        let html = format!("<strong>Variable:</strong> {}", value);
-        let html = format!("<p><strong>Variable:</strong> {}", value);
+        Execution::new(html)
-        Execution::new(plain, html)
     }
 }
 
@@ -74,9 +72,8 @@ impl Command for SetVariableCommand {
         ctx.db.variables.set_user_variable(&key, name, value)?;
 
         let content = format!("{} = {}", name, value);
-        let plain = format!("Set Variable: {}", content);
+        let html = format!("<strong>Set Variable:</strong> {}", content);
-        let html = format!("<p><strong>Set Variable:</strong> {}", content);
+        Execution::new(html)
-        Execution::new(plain, html)
     }
 }
 
@@ -99,8 +96,7 @@ impl Command for DeleteVariableCommand {
             Err(e) => return Err(e.into()),
         };
 
-        let plain = format!("Remove Variable: {}", value);
+        let html = format!("<strong>Remove Variable:</strong> {}", value);
-        let html = format!("<p><strong>Remove Variable:</strong> {}", value);
+        Execution::new(html)
-        Execution::new(plain, html)
     }
 }

src/matrix.rs

@@ -1,5 +1,20 @@
+use log::error;
+use matrix_sdk::events::{
+    room::message::{MessageEventContent::Notice, NoticeMessageEventContent},
+    AnyMessageEventContent::RoomMessage,
+};
+use matrix_sdk::Error as MatrixError;
 use matrix_sdk::{identifiers::RoomId, Client};
 
+/// Extracts more detailed error messages out of a matrix SDK error.
+fn extract_error_message(error: MatrixError) -> String {
+    use matrix_sdk::Error::RumaResponse;
+    match error {
+        RumaResponse(ruma_error) => ruma_error.to_string(),
+        _ => error.to_string(),
+    }
+}
+
 /// Retrieve a list of users in a given room.
 pub async fn get_users_in_room(client: &Client, room_id: &RoomId) -> Vec<String> {
     if let Some(joined_room) = client.get_joined_room(room_id) {
@@ -21,3 +36,17 @@ pub async fn get_users_in_room(client: &Client, room_id: &RoomId) -> Vec<String>
         vec![]
     }
 }
+
+pub async fn send_message(client: &Client, room_id: &RoomId, message: &str) {
+    let plain = html2text::from_read(message.as_bytes(), message.len());
+    let response = RoomMessage(Notice(NoticeMessageEventContent::html(
+        plain.trim(),
+        message,
+    )));
+
+    let result = client.room_send(&room_id, response, None).await;
+    if let Err(e) = result {
+        let message = extract_error_message(e);
+        error!("Error sending message: {}", message);
+    };
+}