Add basic gitlog

crates/gitlog_core/.gitignore

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+/target
+/Cargo.lock

crates/gitlog_core/Cargo.toml

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+[package]
+name = "gitlog_core"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+eyre = { workspace = true }
+git2 = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }

crates/gitlog_core/src/lib.rs

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+use git2::Repository;
+use serde::Serialize;
+
+#[allow(dead_code)]
+#[derive(Debug, Serialize)]
+struct CommitAuthor {
+    email: String,
+    name: String,
+}
+
+#[allow(dead_code)]
+#[derive(Debug, Serialize)]
+struct Commit {
+    title: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    message: Option<String>,
+    author: CommitAuthor,
+    time: i64,
+}
+
+pub fn get_git_log(path: String) -> eyre::Result<String> {
+    let repo = Repository::open(path)?;
+    let mut revwalk = repo.revwalk()?;
+    revwalk.set_sorting(git2::Sort::TIME)?;
+
+    let revspec = repo.revparse("HEAD")?;
+    let from = revspec.from().ok_or(eyre::anyhow!("could not get HEAD"))?;
+    revwalk.push(from.id())?;
+
+    let mut commits: Vec<Commit> = Vec::new();
+    for rev in revwalk.enumerate() {
+        let oid = rev.1?;
+        let commit = repo.find_commit(oid)?;
+        let message = commit
+            .message()
+            .ok_or(eyre::anyhow!("could not find message from commit"))?;
+        let timestamp = commit.time();
+        let author = commit.author();
+
+        let message_content = message.split("\n");
+        let message_heading = message_content
+            .clone()
+            .take(1)
+            .collect::<Vec<&str>>()
+            .join("\n");
+        let message_content = message_content
+            .clone()
+            .skip(1)
+            .collect::<Vec<&str>>()
+            .join("\n");
+
+        let commit = Commit {
+            title: message_heading,
+            message: if message_content == "" {
+                None
+            } else {
+                Some(message_content)
+            },
+            author: CommitAuthor {
+                email: author
+                    .email()
+                    .ok_or(eyre::anyhow!("could not get authors email"))?
+                    .to_string(),
+                name: author
+                    .name()
+                    .ok_or(eyre::anyhow!("could not get authors name"))?
+                    .to_string(),
+            },
+            time: timestamp.seconds(),
+        };
+
+        commits.push(commit);
+    }
+
+    let commits_str = serde_json::to_string(&commits)?;
+
+    Ok(commits_str)
+}