diff --git a/.bumpversion.cfg b/.bumpversion.toml
similarity index 100%
rename from .bumpversion.cfg
rename to .bumpversion.toml
diff --git a/Cargo.lock b/Cargo.lock
index 2ff24e9..53bc586 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -13,9 +13,9 @@ dependencies = [
 
 [[package]]
 name = "anstream"
-version = "0.6.12"
+version = "0.6.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "96b09b5178381e0874812a9b157f7fe84982617e48f71f4e3235482775e5b540"
+checksum = "d96bd03f33fe50a863e394ee9718a706f988b9079b20c3784fb726e7678b62fb"
 dependencies = [
  "anstyle",
  "anstyle-parse",
@@ -61,7 +61,7 @@ dependencies = [
 
 [[package]]
 name = "bump2version"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "clap",
  "regex",
@@ -180,9 +180,9 @@ checksum = "5ee073c9e4cd00e28217186dbe12796d692868f432bf2e97ee73bed0c56dfa01"
 
 [[package]]
 name = "syn"
-version = "2.0.49"
+version = "2.0.52"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "915aea9e586f80826ee59f8453c1101f9d1c4b3964cd2460185ee8e299ada496"
+checksum = "b699d15b36d1f02c3e7c69f8ffef53de37aefae075d8488d4ba1a7788d574a07"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -212,9 +212,9 @@ dependencies = [
 
 [[package]]
 name = "windows-targets"
-version = "0.52.0"
+version = "0.52.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a18201040b24831fbb9e4eb208f8892e1f50a37feb53cc7ff887feb8f50e7cd"
+checksum = "7dd37b7e5ab9018759f893a1952c9420d060016fc19a472b4bb20d1bdd694d1b"
 dependencies = [
  "windows_aarch64_gnullvm",
  "windows_aarch64_msvc",
@@ -227,42 +227,42 @@ dependencies = [
 
 [[package]]
 name = "windows_aarch64_gnullvm"
-version = "0.52.0"
+version = "0.52.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cb7764e35d4db8a7921e09562a0304bf2f93e0a51bfccee0bd0bb0b666b015ea"
+checksum = "bcf46cf4c365c6f2d1cc93ce535f2c8b244591df96ceee75d8e83deb70a9cac9"
 
 [[package]]
 name = "windows_aarch64_msvc"
-version = "0.52.0"
+version = "0.52.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bbaa0368d4f1d2aaefc55b6fcfee13f41544ddf36801e793edbbfd7d7df075ef"
+checksum = "da9f259dd3bcf6990b55bffd094c4f7235817ba4ceebde8e6d11cd0c5633b675"
 
 [[package]]
 name = "windows_i686_gnu"
-version = "0.52.0"
+version = "0.52.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a28637cb1fa3560a16915793afb20081aba2c92ee8af57b4d5f28e4b3e7df313"
+checksum = "b474d8268f99e0995f25b9f095bc7434632601028cf86590aea5c8a5cb7801d3"
 
 [[package]]
 name = "windows_i686_msvc"
-version = "0.52.0"
+version = "0.52.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ffe5e8e31046ce6230cc7215707b816e339ff4d4d67c65dffa206fd0f7aa7b9a"
+checksum = "1515e9a29e5bed743cb4415a9ecf5dfca648ce85ee42e15873c3cd8610ff8e02"
 
 [[package]]
 name = "windows_x86_64_gnu"
-version = "0.52.0"
+version = "0.52.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3d6fa32db2bc4a2f5abeacf2b69f7992cd09dca97498da74a151a3132c26befd"
+checksum = "5eee091590e89cc02ad514ffe3ead9eb6b660aedca2183455434b93546371a03"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
-version = "0.52.0"
+version = "0.52.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a657e1e9d3f514745a572a6846d3c7aa7dbe1658c056ed9c3344c4109a6949e"
+checksum = "77ca79f2451b49fa9e2af39f0747fe999fcda4f5e241b2898624dca97a1f2177"
 
 [[package]]
 name = "windows_x86_64_msvc"
-version = "0.52.0"
+version = "0.52.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dff9641d1cd4be8d1a070daf9e3773c5f67e78b4d9d42263020c057706765c04"
+checksum = "32b752e52a2da0ddfbdbcc6fceadfeede4c939ed16d13e648833a61dfb611ed8"
diff --git a/src/cli.rs b/src/cli.rs
index a46d5df..18a7cab 100755
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -64,7 +64,7 @@ pub struct Cli {
 
     /// Version that needs to be updated.
     #[arg(long = "current-version", value_name = "VERSION")]
-    pub current_version: String,
+    pub current_version: Option<String>,
 
     /// Part of the version to be bumped.
     #[arg(
@@ -91,12 +91,12 @@ pub struct Cli {
     pub serialize: String,
 
     /// Don't write any files, just pretend.
-    #[arg(short = 'n', long = "dry-run")]
+    #[arg(short = 'n', long = "dry-run", default_value_t = false)]
     pub dry_run: bool,
 
     /// New version that should be in the files.
     #[arg(long = "new-version", value_name = "VERSION")]
-    pub new_version: String,
+    pub new_version: Option<String>,
 
     /// Create a commit in version control.
     #[arg(long = "commit", default_value_t = true)]
diff --git a/src/main.rs b/src/main.rs
index 58e5c4c..8c40269 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,9 @@
 use self::cli::Cli;
 use crate::utils::attempt_version_bump;
+use crate::utils::get_current_version_from_config;
+use crate::utils::read_files_from_config;
 use clap::Parser;
+use std::collections::HashSet;
 use std::fs;
 use std::process::Command;
 
@@ -8,23 +11,32 @@ mod cli;
 mod utils;
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    // Parse command-line arguments
     let args = Cli::parse();
     let config_file = args.config_file.clone();
-    let current_version = args.current_version.clone();
+    let config_content = fs::read_to_string(args.config_file.clone()).unwrap();
+    let config_version = get_current_version_from_config(&config_content).ok_or("")?;
+    let current_version = args
+        .current_version
+        .clone()
+        .unwrap_or(config_version)
+        .clone();
 
     let attempted_new_version = attempt_version_bump(args.clone());
 
-    if !args.new_version.is_empty() && attempted_new_version.is_some() {
-        // TODO: fix let new_version = attempted_new_version.clone().unwrap();
-        let new_version = args.new_version.clone();
+    if attempted_new_version.is_some() {
+        let new_version = attempted_new_version.clone().unwrap();
 
         let dry_run = args.dry_run;
         let commit = args.commit;
         let tag = args.tag;
         let message = args.message;
 
-        let files: Vec<String> = args.files;
+        let files: Vec<String> = if args.files.is_empty() {
+            let config_files: HashSet<String> = read_files_from_config(&args.config_file)?;
+            config_files.into_iter().collect()
+        } else {
+            args.files
+        };
 
         // Check if Git working directory is clean
         if fs::metadata(".git").is_ok() {
@@ -66,12 +78,8 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             let mut config_content = fs::read_to_string(config_file.clone())?;
 
             config_content = config_content.replace(
-                &format!("new_version={}", attempted_new_version.unwrap()),
-                "",
-            );
-            config_content = config_content.replace(
-                &format!("current_version={}", current_version),
-                &format!("current_version={}", new_version),
+                &format!("current_version = {}", current_version),
+                &format!("current_version = {}", new_version),
             );
 
             if !dry_run {
@@ -79,22 +87,62 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                 commit_files.push(config_file);
             }
         }
-
-        // Git commit and tag
         if commit {
             for path in &commit_files {
-                Command::new("git").arg("add").arg(path).output()?;
-            }
+                let git_add_output = Command::new("git").arg("add").arg(path).output();
 
-            Command::new("git")
-                .arg("commit")
-                .arg("-m")
-                .arg(
-                    message
-                        .replace("{current_version}", &current_version)
-                        .replace("{new_version}", &new_version),
-                )
-                .output()?;
+                match git_add_output {
+                    Ok(output) => {
+                        if !output.status.success() {
+                            let stderr = String::from_utf8_lossy(&output.stderr);
+                            eprintln!("Error during git add:\n{}", stderr);
+                        }
+                    }
+                    Err(err) => {
+                        eprintln!("Failed to execute git add: {}", err);
+                    }
+                }
+            }
+            let git_diff_output = Command::new("git").arg("diff").output();
+
+            match git_diff_output {
+                Ok(output) => {
+                    if !output.stdout.is_empty() {
+                        // There are changes, proceed with git commit
+                        let commit_output = Command::new("git")
+                            .arg("commit")
+                            .arg("-m")
+                            .arg(
+                                message
+                                    .replace("{current_version}", &current_version)
+                                    .replace("{new_version}", &new_version),
+                            )
+                            .output();
+
+                        match commit_output {
+                            Ok(commit_output) => {
+                                if commit_output.status.success() {
+                                    println!("Git commit successful");
+                                } else {
+                                    eprintln!(
+                                        "Error during git commit:\n{}",
+                                        String::from_utf8_lossy(&commit_output.stderr)
+                                    );
+                                }
+                            }
+                            Err(err) => {
+                                eprintln!("Failed to execute git commit: {}", err);
+                            }
+                        }
+                    } else {
+                        // No changes to commit
+                        println!("No changes to commit. Working tree clean.");
+                    }
+                }
+                Err(err) => {
+                    eprintln!("Failed to execute git diff: {}", err);
+                }
+            }
 
             if tag {
                 Command::new("git")
@@ -104,7 +152,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             }
         }
     } else {
-        println!("No files specified");
+        eprintln!("No files specified");
     }
 
     Ok(())
diff --git a/src/utils.rs b/src/utils.rs
index b8f327c..d64ea51 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -1,49 +1,101 @@
 use crate::cli::Cli;
 use regex::Regex;
 use std::collections::HashMap;
+use std::collections::HashSet;
+use std::fs;
+
+pub fn get_current_version_from_config(config_content: &str) -> Option<String> {
+    let current_version_regex =
+        Regex::new(r#"\[bumpversion\]\s*current_version\s*=\s*(?P<version>\d+(\.\d+){0,2})\s*"#)
+            .unwrap();
+
+    if let Some(captures) = current_version_regex.captures(config_content) {
+        if let Some(version) = captures.name("version") {
+            return Some(version.as_str().to_string());
+        }
+    }
+
+    None
+}
+
+// Function to read files from the configuration file
+pub fn read_files_from_config(config_file: &str) -> Result<HashSet<String>, std::io::Error> {
+    let config_content = fs::read_to_string(config_file)?;
+    let mut config_files = HashSet::new();
+
+    for line in config_content.lines() {
+        if let Some(file_section) = line.strip_prefix("[bumpversion:file:") {
+            if let Some(file_name) = file_section.split(']').next() {
+                config_files.insert(file_name.trim().to_string());
+            }
+        }
+    }
+
+    Ok(config_files)
+}
 
 pub fn attempt_version_bump(args: Cli) -> Option<String> {
-    let parse_regex = args.parse;
-    let regex = Regex::new(&parse_regex).ok()?;
+    let parse_regex = args.parse.clone();
+    let regex = match Regex::new(&parse_regex) {
+        Ok(r) => r,
+        Err(_) => {
+            eprintln!("--patch '{}' is not a valid regex", args.parse.clone());
+            return None;
+        }
+    };
 
-    let current_version = args.current_version;
-    let match_result = regex.captures_iter(&current_version);
+    let config_content = fs::read_to_string(args.config_file.clone()).unwrap();
+    let current_version = get_current_version_from_config(&config_content).unwrap_or_else(|| {
+        panic!("Failed to extract current version from config file");
+    });
+    // let current_version = args.current_version.unwrap_or("".to_string());
+    let mut parsed: HashMap<String, String> = HashMap::new();
 
-    let mut parsed: HashMap<&str, &str> = HashMap::new();
-
-    for caps in match_result {
-        if let (Some(name), Some(value)) = (caps.name("name"), caps.name("value")) {
-            parsed.insert(name.as_str(), value.as_str());
+    if let Some(captures) = regex.captures(&current_version) {
+        for name in regex.capture_names() {
+            if let Some(name) = name {
+                if let Some(capture) = captures.name(name) {
+                    parsed.insert(name.to_string(), capture.as_str().to_string());
+                }
+            }
         }
     }
 
     let order: Vec<&str> = args
         .serialize
         .match_indices('{')
-        .map(|(i, _)| args.serialize[i + 1..].split('}').next().unwrap())
-        .map(|s| s.trim())
+        .map(|(i, _)| args.serialize[i + 1..].split('}').next().unwrap().trim())
         .collect();
 
-    let mut bumped = true;
+    let mut bumped = false;
+
     for label in order {
-        if label == args.bump {
-            if let Some(_part) = parsed.get_mut(label) {
-                // TODO: fix
-                // let new_value = part.parse::<u64>().unwrap() + 1;
-                // *part = &new_value.clone().to_string();
-                bumped = true;
+        if let Some(part) = parsed.get_mut(label) {
+            if label == args.bump {
+                if let Ok(new_value) = part.parse::<u64>() {
+                    *part = (new_value + 1).to_string();
+                    bumped = true;
+                } else {
+                    eprintln!("Failed to parse '{}' as u64", part);
+                    return None;
+                }
+            } else if bumped {
+                *part = "0".to_string();
             }
-        } else if bumped {
-            parsed.insert(label, "0");
         }
     }
 
     if bumped {
-        let new_version = args.serialize.replace(
-            |c| c == '{' || c == '}',
-            parsed.get(&"{").unwrap_or(&"").to_string().as_str(), // TODO: fix c
+        let new_version = format!(
+            "{}.{}.{}",
+            parsed.get("major").unwrap_or(&"0".to_string()),
+            parsed.get("minor").unwrap_or(&"0".to_string()),
+            parsed.get("patch").unwrap_or(&"0".to_string())
         );
-        Some(new_version)
+        let version = args
+            .serialize
+            .replace("{major}.{minor}.{patch}", &new_version);
+        Some(version)
     } else {
         None
     }