support fetching the latest revision for gitea

src/fetcher/gitea.rs

@@ -1,3 +1,6 @@
+use anyhow::{anyhow, Result};
+use serde::Deserialize;
+
 use crate::{
     impl_fetcher,
     simple::{SimpleFetcher, SimpleUrlFetcher},
@@ -6,6 +9,11 @@ use crate::{
 pub struct FetchFromGitea<'a>(pub &'a str);
 impl_fetcher!(FetchFromGitea<'a>);
 
+#[derive(Deserialize)]
+struct Commit {
+    sha: String,
+}
+
 impl<'a> SimpleFetcher<'a, 2> for FetchFromGitea<'a> {
     const KEYS: [&'static str; 2] = ["owner", "repo"];
     const NAME: &'static str = "fetchFromGitea";
@@ -13,6 +21,17 @@ impl<'a> SimpleFetcher<'a, 2> for FetchFromGitea<'a> {
     fn host(&'a self) -> Option<&'a str> {
         Some(self.0)
     }
+
+    fn fetch_rev(&self, [owner, repo]: &[&str; 2]) -> Result<String> {
+        let url = format!("https://{}/api/v1/repos/{owner}/{repo}/commits", self.0);
+        Ok(ureq::get(&url)
+            .call()?
+            .into_json::<Vec<Commit>>()?
+            .into_iter()
+            .next()
+            .ok_or_else(|| anyhow!("no commits found for https://{}/{owner}/{repo}", self.0))?
+            .sha)
+    }
 }
 
 impl<'a> SimpleUrlFetcher<'a, 2> for FetchFromGitea<'a> {