Adds offers for an account to cli

Updates the account command to have an offers command for listing the
offers associated with that account. Also, adds `Clone` to the `Offer`
struct so that it works with `Iter`.

closes #161

Author: choubacha

cli/CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Initial CLI is built and usable in it's most basic form. Listed endpoints can be scrolled.
 - Available data:
   - Account effects can be seen
+  - Account offers can be seen
   - All effects can be seen
   - All ledgers can be seen
   - All operations can be seen

cli/src/account.rs

@@ -55,3 +55,24 @@ pub fn effects(client: &Client, matches: &ArgMatches) -> Result<()> {
     let _ = fmt.stop();
     res
 }
+
+pub fn offers(client: &Client, matches: &ArgMatches) -> Result<()> {
+    let pager = Pager::from_arg(&matches);
+
+    let id = matches.value_of("ID").expect("ID is required");
+    let endpoint = account::Offers::new(id);
+    let endpoint = pager.assign(endpoint);
+    let endpoint = cursor::assign_from_arg(matches, endpoint);
+    let endpoint = ordering::assign_from_arg(matches, endpoint);
+
+    let iter = sync::Iter::new(&client, endpoint);
+
+    let mut res = Ok(());
+    let mut fmt = Formatter::start_stdout(Simple);
+    pager.paginate(iter, |result| match result {
+        Ok(offer) => fmt.render(&offer),
+        Err(err) => res = Err(err.into()),
+    });
+    let _ = fmt.stop();
+    res
+}

cli/src/fmt/simple/mod.rs

@@ -12,6 +12,7 @@ mod account;
 mod asset;
 mod effect;
 mod ledger;
+mod offer;
 mod orderbook;
 mod payment;
 mod trade_aggregation;

cli/src/fmt/simple/offer.rs

@@ -0,0 +1,24 @@
+use fmt::Render;
+use super::Simple;
+use stellar_client::resources::{AssetIdentifier, Offer};
+
+fn render_asset(id: &AssetIdentifier) -> String {
+    if id.is_native() {
+        id.code().to_string()
+    } else {
+        format!("{}-{}", id.code(), id.issuer())
+    }
+}
+
+impl Render<Offer> for Simple {
+    fn render(&self, offer: &Offer) -> Option<String> {
+        let mut buf = String::new();
+        append_to_buffer!(buf, "ID:           {}", offer.id());
+        append_to_buffer!(buf, "Seller:       {}", offer.seller());
+        append_to_buffer!(buf, "Selling:      {}", render_asset(offer.selling()));
+        append_to_buffer!(buf, "Buying:       {}", render_asset(offer.buying()));
+        append_to_buffer!(buf, "Amount:       {}", offer.amount());
+        append_to_buffer!(buf, "Price:        {}", offer.price());
+        Some(buf)
+    }
+}

cli/src/main.rs

@@ -97,6 +97,18 @@ fn build_app<'a, 'b>() -> App<'a, 'b> {
                             )
                     ),
 
+                )
+                .subcommand(
+                    listable!(
+                        SubCommand::with_name("offers")
+                            .about("Fetch all open offers for an account")
+                            .arg(
+                                Arg::with_name("ID")
+                                    .required(true)
+                                    .help("The identifier of the account to look up"),
+                            )
+                    ),
+
                 ),
         )
         .subcommand(
@@ -394,6 +406,7 @@ fn main() {
             ("details", Some(sub_m)) => account::details(&client, sub_m),
             ("transactions", Some(sub_m)) => account::transactions(&client, sub_m),
             ("effects", Some(sub_m)) => account::effects(&client, sub_m),
+            ("offers", Some(sub_m)) => account::offers(&client, sub_m),
             _ => return print_help_and_exit(),
         },
         ("assets", Some(sub_m)) => match sub_m.subcommand() {

client/src/resources/offer.rs

@@ -81,7 +81,7 @@ mod offer_summary_tests {
 }
 
 /// An offer being made for particular assets at a particular exchange rate.
-#[derive(Deserialize, Debug)]
+#[derive(Deserialize, Debug, Clone)]
 pub struct Offer {
     id: i64,
     paging_token: String,