add ids formatter

src/formatters.rs

@@ -10,6 +10,7 @@ use crate::models::Entry;
 pub mod text;
 pub mod csv;
 pub mod json;
+pub mod ids;
 
 #[derive(Debug, Serialize, Deserialize)]
 #[serde(rename_all = "lowercase")]
@@ -17,6 +18,7 @@ pub enum Formatter {
     Text,
     Csv,
     Json,
+    Ids,
     Custom(String),
 }
 
@@ -38,6 +40,7 @@ impl Formatter {
             Formatter::Text => text::print_formatted(entries, out, now, ids)?,
             Formatter::Csv => csv::print_formatted(entries, out, ids)?,
             Formatter::Json => json::print_formatted(entries, out)?,
+            Formatter::Ids => ids::print_formatted(entries, out)?,
             Formatter::Custom(name) => {
                 panic!("attempted custom formatter with name {} which is not implemented", name);
             }
@@ -57,6 +60,7 @@ impl FromStr for Formatter {
             "text" => Formatter::Text,
             "csv" => Formatter::Csv,
             "json" => Formatter::Json,
+            "ids" => Formatter::Ids,
             custom_format => Formatter::Custom(custom_format.into()),
         })
     }

src/formatters/ids.rs

@@ -0,0 +1,8 @@
+use std::io::Write;
+
+use crate::models::Entry;
+use crate::error::Result;
+
+pub fn print_formatted<W: Write>(entries: Vec<Entry>, out: &mut W) -> Result<()> {
+    Ok(writeln!(out, "{}", entries.into_iter().map(|e| e.id.to_string()).collect::<Vec<_>>().join(" "))?)
+}