Generify query and output

src/commands/mod.rs

@@ -1,6 +1,10 @@
 use serenity::model::channel::Message;
+use std::fmt;
+use serenity::model::id::ChannelId;
+use serde::de::DeserializeOwned;
 use serenity::prelude::*;
 mod pacman;
+extern crate reqwest;
 
 pub struct Handler;
 pub type CommandHandler = dyn Fn(Context, Message);
@@ -45,3 +49,33 @@ impl Command {
         }
     }
 }
+
+pub fn send(target: ChannelId, message: &str, ctx: &Context) {
+    if let Err(cause) = target.say(&ctx.http, message) {
+        println!("Could not send message: {}", cause);
+    }
+}
+
+pub fn respond_with_results<T: fmt::Display>(target: ChannelId, results: &Vec<T>, ctx: &Context) {
+    send(
+        target,
+        &format!(
+            "```{}```",
+            results
+                .into_iter()
+                .take(5)
+                .map(|p| format!("{}\n", p))
+                .collect::<String>()
+        ),
+        ctx,
+    );
+}
+
+pub fn search<T: DeserializeOwned>(url: &str, fallback: T) -> T {
+    return search_inner(url).unwrap_or(fallback);
+}
+
+fn search_inner<T: DeserializeOwned>(url: &str) -> Result<T, reqwest::Error> {
+    let resp = reqwest::get(url)?.json::<T>()?;
+    Ok(resp)
+}

src/commands/pacman.rs

@@ -1,9 +1,7 @@
+use crate::commands::*;
 use serde::{Deserialize, Serialize};
 use serenity::model::channel::Message;
-use serenity::model::id::ChannelId;
-use serenity::prelude::*;
 use std::fmt;
-extern crate reqwest;
 
 pub fn query_pacman(ctx: Context, msg: Message) {
     let mut args = msg.content.split_whitespace().collect::<Vec<_>>();
@@ -19,10 +17,13 @@ pub fn query_pacman(ctx: Context, msg: Message) {
     }
     if args.len() == 1 {
         // try by full package name
-        let response = search(&format!(
-            "https://www.archlinux.org/packages/search/json/?name={}",
-            &args[0]
-        ));
+        let response: Response = search(
+            &format!(
+                "https://www.archlinux.org/packages/search/json/?name={}",
+                &args[0]
+            ),
+            EMPTY_RESULT,
+        );
         // this is 1 for most packages and 2 if there’s a second version in testing
         if response.results.len() != 0 {
             respond_with_results(msg.channel_id, &response.results, &ctx);
@@ -30,10 +31,13 @@ pub fn query_pacman(ctx: Context, msg: Message) {
         }
     }
     let query = args.join(" ");
-    let response = search(&format!(
-        "https://www.archlinux.org/packages/search/json/?q={}",
-        &query
-    ));
+    let response: Response = search(
+        &format!(
+            "https://www.archlinux.org/packages/search/json/?q={}",
+            &query
+        ),
+        EMPTY_RESULT,
+    );
     if response.results.len() == 0 {
         send(msg.channel_id, "No results", &ctx);
         return;
@@ -41,36 +45,6 @@ pub fn query_pacman(ctx: Context, msg: Message) {
     respond_with_results(msg.channel_id, &response.results, &ctx);
 }
 
-fn respond_with_results(target: ChannelId, results: &Vec<Package>, ctx: &Context) {
-    send(
-        target,
-        &format!(
-            "```{}```",
-            results
-                .into_iter()
-                .take(5)
-                .map(|p| format!("{}\n", p))
-                .collect::<String>()
-        ),
-        ctx,
-    );
-}
-
-fn send(target: ChannelId, message: &str, ctx: &Context) {
-    if let Err(cause) = target.say(&ctx.http, message) {
-        println!("Could not send message: {}", cause);
-    }
-}
-
-fn search(url: &str) -> Response {
-    return search_inner(url).unwrap_or(EMPTY_RESULT);
-}
-
-fn search_inner(url: &str) -> Result<Response, reqwest::Error> {
-    let resp = reqwest::get(url)?.json::<Response>()?;
-    Ok(resp)
-}
-
 const EMPTY_RESULT: Response = Response {
     version: 0,
     limit: 0,