1 files changed, 27 insertions, 0 deletions
diff --git a/src/frontend/list.rs b/src/frontend/list.rs
index 8cff146..e870ab0 100644
--- a/src/frontend/list.rs
+++ b/src/frontend/list.rs
@@ -4,10 +4,14 @@ use std::ops::Deref;
 
 use librepology::v1::types::Package;
 use librepology::v1::types::Problem;
+use librepology::v1::types::Repo;
 use failure::Fallible as Result;
 use failure::Error;
 
 use crate::frontend::Frontend;
+use crate::backend::Backend;
+use crate::compare::ComparePackage;
+use librepology::v1::api::Api;
 
 pub struct ListFrontend(Stdout);
 
@@ -67,5 +71,28 @@ impl Frontend for ListFrontend {
             })
         })
     }
+
+    fn compare_packages(&self, packages: Vec<ComparePackage>, backend: &Backend, filter_repos: Vec<Repo>) -> Result<()> {
+        let mut output = self.0.lock();
+
+        for package in packages {
+            backend
+                .project(package.name().deref())?
+                .into_iter()
+                .filter(|p| filter_repos.contains(p.repo()))
+                .map(|upstream_package| {
+                    writeln!(output,
+                             "{our_package_name} - {our_package_version} - {up_repo_name} - {up_package_version}",
+                             our_package_name    = package.name().deref(),
+                             our_package_version = package.version().deref(),
+                             up_repo_name        = upstream_package.repo().deref(),
+                             up_package_version  = upstream_package.version().deref()
+                    ).map_err(Error::from)
+                })
+                .collect::<Result<Vec<()>>>()?;
+        }
+
+        Ok(())
+    }
 }