Respect --json in mensa canteens

See #4.

src/canteen.rs

@@ -1,6 +1,6 @@
 use chrono::Duration;
 use reqwest::blocking::Client;
-use serde::{de::DeserializeOwned, Deserialize};
+use serde::{de::DeserializeOwned, Deserialize, Serialize};
 use tracing::info;
 
 use std::marker::PhantomData;
@@ -9,18 +9,18 @@ use crate::{
     cache,
     config::CanteensState,
     error::{Error, Result},
-    geoip, get_sane_terminal_dimensions, ENDPOINT, TTL_CANTEENS,
+    geoip, get_sane_terminal_dimensions, print_json, ENDPOINT, TTL_CANTEENS,
 };
 
 const ADRESS_INDENT: &str = "     ";
 
-#[derive(Debug, Clone, Deserialize)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct Canteen {
     id: usize,
     name: String,
-    //city: String,
+    city: String,
     address: String,
-    //oordinates: [f32; 2],
+    coordinates: [f32; 2],
 }
 
 impl Canteen {
@@ -58,10 +58,15 @@ impl Canteen {
         PaginatedList::from(&state.client, url, *TTL_CANTEENS)?.try_flatten_and_collect()
     }
 
-    pub fn print_all(state: &CanteensState, canteens: &[Self]) {
-        for canteen in canteens {
-            println!();
-            canteen.print(state);
+    pub fn print_all(state: &CanteensState, canteens: &[Self]) -> Result<()> {
+        if state.args.json {
+            print_json(&canteens)
+        } else {
+            for canteen in canteens {
+                println!();
+                canteen.print(state);
+            }
+            Ok(())
         }
     }
 }

src/config/args.rs

@@ -40,7 +40,7 @@ pub struct Args {
                 )]
     pub color: ColorWhen,
 
-    /// Print plain json. Useful for shell scripts.
+    /// Output json. Useful for shell scripts.
     #[structopt(long, global = true, takes_value = false)]
     pub json: bool,
 

src/main.rs

@@ -167,7 +167,7 @@ fn real_main() -> Result<()> {
         Some(Command::Canteens(cmd)) => {
             let state = State::from(state, cmd);
             let canteens = Canteen::fetch(&state)?;
-            Canteen::print_all(&state, &canteens);
+            Canteen::print_all(&state, &canteens)?;
         }
         Some(Command::Tags) => {
             Tag::print_all(&state)?;