Add live git status indicators (#458)

crates/yaak-git/src/log.rs

@@ -8,6 +8,7 @@ use ts_rs::TS;
 #[serde(rename_all = "camelCase")]
 #[ts(export, export_to = "gen_git.ts")]
 pub struct GitCommit {
+    pub oid: String,
     pub author: GitAuthor,
     pub when: DateTime<Utc>,
     pub message: Option<String>,
@@ -21,7 +22,23 @@ pub struct GitAuthor {
     pub email: Option<String>,
 }
 
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize, TS)]
+#[serde(rename_all = "camelCase")]
+#[ts(export, export_to = "gen_git.ts")]
+pub struct GitFileDiff {
+    pub original: String,
+    pub modified: String,
+}
+
 pub fn git_log(dir: &Path) -> crate::error::Result<Vec<GitCommit>> {
+    git_log_inner(dir, None)
+}
+
+pub fn git_log_for_file(dir: &Path, rela_path: &Path) -> crate::error::Result<Vec<GitCommit>> {
+    git_log_inner(dir, Some(rela_path))
+}
+
+fn git_log_inner(dir: &Path, rela_path: Option<&Path>) -> crate::error::Result<Vec<GitCommit>> {
     let repo = open_repo(dir)?;
 
     // Return empty if empty repo or no head (new repo)
@@ -46,8 +63,16 @@ pub fn git_log(dir: &Path) -> crate::error::Result<Vec<GitCommit>> {
         .filter_map(|oid| {
             let oid = filter_try!(oid);
             let commit = filter_try!(repo.find_commit(oid));
+            if let Some(rela_path) = rela_path {
+                let touches_path = filter_try!(commit_touches_path(&repo, &commit, rela_path));
+                if !touches_path {
+                    return None;
+                }
+            }
+
             let author = commit.author();
             Some(GitCommit {
+                oid: oid.to_string(),
                 author: GitAuthor {
                     name: author.name().map(|s| s.to_string()),
                     email: author.email().map(|s| s.to_string()),
@@ -61,6 +86,53 @@ pub fn git_log(dir: &Path) -> crate::error::Result<Vec<GitCommit>> {
     Ok(log)
 }
 
+pub fn git_file_diff_for_commit(
+    dir: &Path,
+    commit_oid: &str,
+    rela_path: &Path,
+) -> crate::error::Result<GitFileDiff> {
+    let repo = open_repo(dir)?;
+    let oid = git2::Oid::from_str(commit_oid)?;
+    let commit = repo.find_commit(oid)?;
+    let new_tree = commit.tree()?;
+    let old_tree = if commit.parent_count() > 0 { Some(commit.parent(0)?.tree()?) } else { None };
+
+    Ok(GitFileDiff {
+        original: blob_text_at_path(&repo, old_tree.as_ref(), rela_path)?,
+        modified: blob_text_at_path(&repo, Some(&new_tree), rela_path)?,
+    })
+}
+
+fn commit_touches_path(
+    repo: &git2::Repository,
+    commit: &git2::Commit,
+    rela_path: &Path,
+) -> crate::error::Result<bool> {
+    let new_tree = commit.tree()?;
+    let old_tree = if commit.parent_count() > 0 { Some(commit.parent(0)?.tree()?) } else { None };
+
+    let mut opts = git2::DiffOptions::new();
+    opts.pathspec(rela_path);
+
+    let diff = repo.diff_tree_to_tree(old_tree.as_ref(), Some(&new_tree), Some(&mut opts))?;
+    Ok(diff.deltas().len() > 0)
+}
+
+fn blob_text_at_path(
+    repo: &git2::Repository,
+    tree: Option<&git2::Tree>,
+    rela_path: &Path,
+) -> crate::error::Result<String> {
+    let Some(tree) = tree else {
+        return Ok(String::new());
+    };
+    let Ok(entry) = tree.get_path(rela_path) else {
+        return Ok(String::new());
+    };
+    let blob = entry.to_object(repo)?.peel_to_blob()?;
+    Ok(String::from_utf8(blob.content().to_vec())?)
+}
+
 #[cfg(test)]
 fn convert_git_time_to_date(_git_time: git2::Time) -> DateTime<Utc> {
     DateTime::from_timestamp(0, 0).unwrap()