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+dependencies = [
+ "winapi",
+]

diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644 (file)
index 0000000..91c613f
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "minetest-servers"
+version = "0.1.0"
+edition = "2021"
+authors = ["Lizzy Fleckenstein"]
+description = "Output info about minetest servers fetched from server list. Based on http://news.dieweltistgarnichtso.net/bin/minetest-servers"
+
+[dependencies]
+anyhow = "1.0.70"
+clap = { version = "4.2.1", features = ["derive"] }
+itertools = "0.10.5"
+reqwest = { version = "0.11.16", features = ["json", "blocking"] }
+serde = { version = "1.0.160", features = ["derive"] }
+serde_json = "1.0.95"

diff --git a/src/main.rs b/src/main.rs
new file mode 100644 (file)
index 0000000..9986096
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,82 @@
+use anyhow::anyhow;
+use clap::CommandFactory;
+use clap::Parser;
+use itertools::Itertools;
+use serde::Deserialize;
+use serde_json::Value as JsonValue;
+use std::{
+    collections::{BTreeMap, BTreeSet},
+    fmt,
+};
+
+fn main() -> anyhow::Result<()> {
+    #[derive(Parser, Debug)]
+    #[clap(author, version, about, long_about = None)]
+    struct Args {
+        /// Address of the server list
+        #[clap(short, long, value_parser, default_value_t = String::from("https://servers.minetest.net/list"))]
+        address: String,
+
+        /// List available keys
+        #[clap(short, long, action)]
+        show_keys: bool,
+
+        /// The key to look up. Use --show-keys to list available keys.
+        key: Option<String>,
+    }
+    let args = Args::parse();
+
+    #[derive(Deserialize)]
+    struct Payload {
+        list: Vec<BTreeMap<String, JsonValue>>,
+    }
+    let payload: Payload = reqwest::blocking::get(args.address)?.json()?;
+
+    if args.show_keys {
+        let keys: BTreeSet<&String> = payload.list.iter().flat_map(BTreeMap::keys).collect();
+        println!("available keys: {}", keys.iter().format(", "));
+    }
+
+    if let Some(key) = args.key {
+        let mut iter = payload
+            .list
+            .iter()
+            .flat_map(|server| server.get(&key).map(|value| (server, value)))
+            .peekable();
+
+        if iter.peek().is_none() {
+            return Err(anyhow!("invalid key"));
+        } else {
+            iter.for_each(|(server, value)| {
+                struct DisplayJson<'a>(Option<&'a JsonValue>);
+                impl<'a> fmt::Display for DisplayJson<'a> {
+                    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+                        match self.0 {
+                            None => Ok(()),
+                            Some(value) => match value {
+                                JsonValue::String(x) => write!(f, "{x}"),
+                                _ => write!(f, "{value}"),
+                            },
+                        }
+                    }
+                }
+
+                let address = DisplayJson(server.get("address"));
+                let port = DisplayJson(server.get("port"));
+
+                if let JsonValue::Array(array) = value {
+                    let prefix = format!("{address}:{port}"); // cache it
+                    for value in array.iter() {
+                        println!("{prefix}\t{}", DisplayJson(Some(value)));
+                    }
+                } else {
+                    println!("{address}:{port}\t{}", DisplayJson(Some(value)));
+                }
+            });
+        }
+    } else if !args.show_keys {
+        Args::command().print_help()?;
+    }
+
+    Ok(())
+}