feat: support files field in package metadata

CHANGELOG.md

@@ -6,6 +6,17 @@
 
 - The `--output` flag for customizing the location of the output produced by
   `cargo aur`. If unused, the default remains `target/cargo-aur/`.
+- A new `files` field in `[package.metadata.aur]`, which accepts a list-of-pairs
+  of additional files you want copied to the user's filesystem upon package
+  installation. Output looks like:
+
+```
+package() {
+    install -Dm755 cargo-aur -t "$pkgdir/usr/bin"
+    install -Dm644 LICENSE "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+    install -Dm644 "/path/to/original" "/path/to/target"
+}
+```
 
 #### Fixed
 

Cargo.toml

@@ -24,3 +24,7 @@ strip = true
 opt-level = "z"
 codegen-units = 1
 panic = "abort"
+
+[package.metadata.aur]
+depends = ["blah"]
+files = [["/path/to/original", "/path/to/target"]]

src/lib.rs

@@ -91,6 +91,18 @@ pub struct Metadata {
     pub aur: Option<AUR>,
 }
 
+impl Metadata {
+    /// The metadata block actually has some contents.
+    pub fn non_empty(&self) -> bool {
+        self.depends.is_empty().not()
+            || self.optdepends.is_empty().not()
+            || self
+                .aur
+                .as_ref()
+                .is_some_and(|aur| aur.depends.is_empty().not() || aur.optdepends.is_empty().not())
+    }
+}
+
 impl std::fmt::Display for Metadata {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         // Reconcile which section to read extra dependency information from.
@@ -150,4 +162,6 @@ pub struct AUR {
     depends: Vec<String>,
     #[serde(default)]
     optdepends: Vec<String>,
+    #[serde(default)]
+    pub files: Vec<(String, String)>,
 }

src/main.rs

@@ -208,8 +208,11 @@ where
     writeln!(file, "provides=(\"{}\")", package.name)?;
     writeln!(file, "conflicts=(\"{}\")", package.name)?;
 
-    if let Some(metadata) = package.metadata.as_ref() {
-        writeln!(file, "{}", metadata)?;
+    match package.metadata.as_ref() {
+        Some(metadata) if metadata.non_empty() => {
+            writeln!(file, "{}", metadata)?;
+        }
+        Some(_) | None => {}
     }
 
     writeln!(file, "source=(\"{}\")", source)?;
@@ -234,6 +237,12 @@ where
         )?;
     }
 
+    if let Some(aur) = package.metadata.as_ref().and_then(|m| m.aur.as_ref()) {
+        for (source, target) in aur.files.iter() {
+            writeln!(file, "    install -Dm644 \"{}\" \"{}\"", source, target)?;
+        }
+    }
+
     writeln!(file, "}}")?;
     Ok(())
 }