detect url from homepage, documentation or repository fields

CHANGELOG.md

@@ -7,6 +7,10 @@
 - The `--output` flag for customizing the location of the output produced by
   `cargo aur`. If unused, the default remains `target/cargo-aur/`.
 
+#### Fixed
+
+- Supply the `url` from backup sources if `homepage` is not specified in the `Cargo.toml`.
+
 ## 1.6.0 (2023-10-02)
 
 #### Changed

src/lib.rs

@@ -32,10 +32,11 @@ pub struct Package {
     pub version: String,
     pub authors: Vec<String>,
     pub description: String,
-    pub homepage: String,
     pub repository: String,
     pub license: String,
     pub metadata: Option<Metadata>,
+    pub homepage: Option<String>,
+    pub documentation: Option<String>,
 }
 
 impl Package {
@@ -53,6 +54,15 @@ impl Package {
             None
         }
     }
+
+    /// Fetch the package URL from its `homepage`, `documentation` or
+    /// `repository` field.
+    pub fn url(&self) -> &str {
+        self.homepage
+            .as_deref()
+            .or(self.documentation.as_deref())
+            .unwrap_or(&self.repository)
+    }
 }
 
 // {

src/main.rs

@@ -130,7 +130,7 @@ fn work(args: Args) -> Result<(), Error> {
 
         // Write the PKGBUILD.
         let path = output.join("PKGBUILD");
-        let file = BufWriter::new(File::create(&path)?);
+        let file = BufWriter::new(File::create(path)?);
         pkgbuild(file, &config, &sha256, license.as_ref())?;
     }
 
@@ -202,7 +202,7 @@ where
     writeln!(file, "pkgver={}", package.version)?;
     writeln!(file, "pkgrel=1")?;
     writeln!(file, "pkgdesc=\"{}\"", package.description)?;
-    writeln!(file, "url=\"{}\"", package.homepage)?;
+    writeln!(file, "url=\"{}\"", package.url())?;
     writeln!(file, "license=(\"{}\")", package.license)?;
     writeln!(file, "arch=(\"x86_64\")")?;
     writeln!(file, "provides=(\"{}\")", package.name)?;