Run git reset before pulling changes to cached aur packages

Fixes #101

src/builder/git.rs

@@ -67,3 +67,33 @@ impl GitPullBuilder {
         }
     }
 }
+
+#[derive(Debug, Default)]
+pub struct GitResetBuilder {
+    directory: PathBuf,
+}
+
+impl GitResetBuilder {
+    pub fn directory<P: AsRef<Path>>(mut self, path: P) -> Self {
+        self.directory = path.as_ref().into();
+
+        self
+    }
+
+    pub async fn reset(self) -> AppResult<()> {
+        let result = ShellCommand::git()
+            .arg("-C")
+            .arg(self.directory)
+            .arg("reset")
+            .arg("HEAD")
+            .arg("--hard")
+            .wait_with_output()
+            .await?;
+
+        if result.status.success() {
+            Ok(())
+        } else {
+            Err(AppError::Other(result.stderr))
+        }
+    }
+}

src/operations/aur_install/common.rs

@@ -15,7 +15,10 @@ use tokio::{
     task,
 };
 
-use crate::error::{AppError, AppResult};
+use crate::{
+    builder::git::GitResetBuilder,
+    error::{AppError, AppResult},
+};
 use crate::{
     builder::{
         git::{GitCloneBuilder, GitPullBuilder},
@@ -56,6 +59,10 @@ pub async fn download_aur_source(mut ctx: BuildContext) -> AppResult<BuildContex
             pkg_name.clone().bold(),
             fl!("pulling-latest-changes")
         ));
+        GitResetBuilder::default()
+            .directory(&pkg_dir)
+            .reset()
+            .await?;
         GitPullBuilder::default().directory(&pkg_dir).pull().await?;
     } else {
         let aur_url = crate::internal::rpc::URL;