improve command running

src/backend/todo_per_backend.rs

@@ -1,3 +1,5 @@
+use anyhow::{bail, ensure, Context, Result};
+
 use super::Backend;
 use crate::Package;
 
@@ -12,10 +14,6 @@ impl ToDoPerBackend {
         self.0.push(item);
     }
 
-    pub(crate) fn into_iter(self) -> impl Iterator<Item = (Box<dyn Backend>, Vec<Package>)> {
-        self.0.into_iter()
-    }
-
     pub(crate) fn iter(&self) -> impl Iterator<Item = &(Box<dyn Backend>, Vec<Package>)> {
         self.0.iter()
     }
@@ -24,10 +22,34 @@ impl ToDoPerBackend {
         self.0.iter().all(|(_, diff)| diff.is_empty())
     }
 
-    pub(crate) fn install_missing_packages(&self) {
-        self.0
-            .iter()
-            .for_each(|(backend, diff)| backend.install_packages(diff));
+    // TODO try to combine these methods into one
+    pub(crate) fn install_missing_packages(&self) -> Result<()> {
+        for (backend, packages) in &self.0 {
+            let exit_status = backend
+                .install_packages(packages)
+                .with_context(|| format!("installing packages for {}", backend.get_binary()))?;
+
+            match exit_status.code() {
+                Some(val) => ensure!(val == 0, "command returned with exit code {val}"),
+                None => bail!("could not install packages for {}", backend.get_binary()),
+            }
+        }
+        Ok(())
+    }
+
+    // TODO this one
+    pub(crate) fn remove_unmanaged_packages(&self) -> Result<()> {
+        for (backend, packages) in &self.0 {
+            let exit_status = backend
+                .remove_packages(packages)
+                .with_context(|| format!("removing packages for {}", backend.get_binary()))?;
+
+            match exit_status.code() {
+                Some(val) => ensure!(val == 0, "command returned with exit code {val}"),
+                None => bail!("could not remove packages for {}", backend.get_binary()),
+            }
+        }
+        Ok(())
     }
 
     pub(crate) fn is_empty(&self) -> bool {