diff --git a/Cargo.lock b/Cargo.lock
index ff166df..4a168e7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,17 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.1.0"
@@ -29,6 +40,43 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "clap"
+version = "4.0.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e67816e006b17427c9b4386915109b494fec2d929c63e3bd3561234cbf1bf1e"
+dependencies = [
+ "atty",
+ "bitflags",
+ "clap_derive",
+ "clap_lex",
+ "once_cell",
+ "strsim",
+ "termcolor",
+]
+
+[[package]]
+name = "clap_derive"
+version = "4.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "16a1b0f6422af32d5da0c58e2703320f379216ee70198241c84173a8c5ac28f3"
+dependencies = [
+ "heck",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "clap_lex"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0d4198f73e42b4936b35b5bb248d81d2b595ecb170da0bac7655c54eedfa8da8"
+dependencies = [
+ "os_str_bytes",
+]
+
 [[package]]
 name = "eyre"
 version = "0.6.8"
@@ -52,8 +100,12 @@ dependencies = [
 name = "git-log"
 version = "0.1.0"
 dependencies = [
+ "clap",
  "eyre",
  "git2",
+ "gitlog_core",
+ "serde",
+ "serde_json",
 ]
 
 [[package]]
@@ -71,6 +123,31 @@ dependencies = [
  "url",
 ]
 
+[[package]]
+name = "gitlog_core"
+version = "0.1.0"
+dependencies = [
+ "eyre",
+ "git2",
+ "serde",
+ "serde_json",
+]
+
+[[package]]
+name = "heck"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2540771e65fc8cb83cd6e8a237f70c319bd5c29f78ed1084ba5d50eeac86f7f9"
+
+[[package]]
+name = "hermit-abi"
+version = "0.1.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "idna"
 version = "0.3.0"
@@ -87,6 +164,12 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ce23b50ad8242c51a442f3ff322d56b02f08852c77e4c0b4d3fd684abc89c683"
 
+[[package]]
+name = "itoa"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4217ad341ebadf8d8e724e264f13e593e0648f5b3e94b3896a5df283be015ecc"
+
 [[package]]
 name = "jobserver"
 version = "0.1.25"
@@ -176,6 +259,12 @@ dependencies = [
  "vcpkg",
 ]
 
+[[package]]
+name = "os_str_bytes"
+version = "6.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3baf96e39c5359d2eb0dd6ccb42c62b91d9678aa68160d261b9e0ccbf9e9dea9"
+
 [[package]]
 name = "percent-encoding"
 version = "2.2.0"
@@ -188,6 +277,111 @@ version = "0.3.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6ac9a59f73473f1b8d852421e59e64809f025994837ef743615c6d0c5b305160"
 
+[[package]]
+name = "proc-macro-error"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.47"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ea3d908b0e36316caf9e9e2c4625cdde190a7e6f440d794667ed17a1855e725"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbe448f377a7d6961e30f5955f9b8d106c3f5e449d493ee1b125c1d43c2b5179"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "ryu"
+version = "1.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4501abdff3ae82a1c1b477a17252eb69cee9e66eb915c1abaa4f44d873df9f09"
+
+[[package]]
+name = "serde"
+version = "1.0.147"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d193d69bae983fc11a79df82342761dfbf28a99fc8d203dca4c3c1b590948965"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.147"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4f1d362ca8fc9c3e3a7484440752472d68a6caa98f1ab81d99b5dfe517cec852"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.87"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ce777b7b150d76b9cf60d28b55f5847135a003f7d7350c6be7a773508ce7d45"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "strsim"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+
+[[package]]
+name = "syn"
+version = "1.0.103"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a864042229133ada95abf3b54fdc62ef5ccabe9515b64717bcb9a1919e59445d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "termcolor"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bab24d30b911b2376f3a13cc2cd443142f0c81dda04c118693e35b3835757755"
+dependencies = [
+ "winapi-util",
+]
+
 [[package]]
 name = "tinyvec"
 version = "1.6.0"
@@ -209,6 +403,12 @@ version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "099b7128301d285f79ddd55b9a83d5e6b9e97c92e0ea0daebee7263e932de992"
 
+[[package]]
+name = "unicode-ident"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"
+
 [[package]]
 name = "unicode-normalization"
 version = "0.1.22"
@@ -234,3 +434,40 @@ name = "vcpkg"
 version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
+
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/Cargo.toml b/Cargo.toml
index 117bb8e..6b5eb08 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,6 +5,20 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
-[dependencies]
+[workspace]
+members = ["crates/gitlog_core"]
+
+[workspace.dependencies]
 eyre = "0.6.8"
 git2 = "0.15.0"
+serde = { version = "1.0.147", features = ["derive"] }
+serde_json = "1.0.87"
+
+[dependencies]
+gitlog_core = { path = "crates/gitlog_core" }
+
+eyre = { workspace = true }
+git2 = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+clap = { version = "4.0.19", features = ["env", "derive"] }
diff --git a/crates/gitlog_core/.gitignore b/crates/gitlog_core/.gitignore
new file mode 100644
index 0000000..4fffb2f
--- /dev/null
+++ b/crates/gitlog_core/.gitignore
@@ -0,0 +1,2 @@
+/target
+/Cargo.lock
diff --git a/crates/gitlog_core/Cargo.toml b/crates/gitlog_core/Cargo.toml
new file mode 100644
index 0000000..b85acd2
--- /dev/null
+++ b/crates/gitlog_core/Cargo.toml
@@ -0,0 +1,12 @@
+[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 }
diff --git a/crates/gitlog_core/src/lib.rs b/crates/gitlog_core/src/lib.rs
new file mode 100644
index 0000000..aeeda1e
--- /dev/null
+++ b/crates/gitlog_core/src/lib.rs
@@ -0,0 +1,78 @@
+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)
+}
diff --git a/src/main.rs b/src/main.rs
index ad67c21..d44c407 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,22 +1,17 @@
-use git2::Repository;
+use clap::Parser;
+
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about = None)]
+struct Cli {
+    #[arg(short, long, required = true)]
+    path: String,
+}
 
 fn main() -> eyre::Result<()> {
-    let repo = Repository::open(".git")?;
-    let mut revwalk = repo.revwalk()?;
-    revwalk.set_sorting(git2::Sort::TIME)?;
+    let args = Cli::parse();
 
-    let revspec = repo.revparse("HEAD")?;
-    let from = revspec.from().ok_or(eyre::anyhow!("could not get HEAD"))?;
-    revwalk.push(from.id())?;
-
-    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"))?;
-        println!("rev: {}", message)
-    }
+    let log = gitlog_core::get_git_log(args.path)?;
+    println!("{}", log);
 
     Ok(())
 }