fix: make part and file section in config optional

.bumpversion.toml

@@ -1,4 +1,4 @@
-current_version = "1.0.0"
+current_version = "1.0.1"
 commit = true
 tag = true
 message = "chore: bump {current_version} → {new_version}"

Cargo.lock

@@ -61,7 +61,7 @@ dependencies = [
 
 [[package]]
 name = "bump2version"
-version = "1.0.0"
+version = "1.0.1"
 dependencies = [
  "clap",
  "regex",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "bump2version"
-version = "1.0.0"
+version = "1.0.1"
 edition = "2021"
 description = "⬆️ Easily manage version numbers in your projects."
 license = "MIT"

src/config.rs

@@ -13,8 +13,8 @@ pub(crate) struct Config {
     #[serde(default = "default_serialize")]
     pub(crate) serialize: String,
 
-    pub(crate) part: HashMap<String, Part>,
-    pub(crate) file: HashMap<String, File>,
+    pub(crate) part: Option<HashMap<String, Part>>,
+    pub(crate) file: Option<HashMap<String, File>>,
 }
 
 #[derive(Debug, Clone, Deserialize)]

src/main.rs

@@ -2,6 +2,8 @@ use self::cli::Cli;
 use crate::config::Config;
 use crate::utils::attempt_version_bump;
 use clap::Parser;
+use config::File;
+use std::collections::HashMap;
 use std::fs;
 use std::process::{exit, Command};
 use tracing::{error, info, level_filters::LevelFilter, warn};
@@ -57,7 +59,8 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             .or(config.message)
             .unwrap_or("Bump version: {current_version} → {new_version}".to_string());
 
-        let files: Vec<&String> = config.file.keys().collect();
+        let config_files = config.file.unwrap_or_default();
+        let files: Vec<&String> = config_files.keys().collect();
 
         // Check if Git working directory is clean
         if fs::metadata(".git").is_ok() {
@@ -84,7 +87,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         info!(amount = &files.len(), "Updating version in files");
         for path in files.clone() {
             let content = fs::read_to_string(path)?;
-            let format = &config.file.get(path).unwrap().format;
+            let format = &config_files.get(path).unwrap().format.clone();
 
             let old_line = format.replace("{version}", &current_version);
             if !content.contains(&old_line) {

src/utils.rs

@@ -41,7 +41,7 @@ pub fn attempt_version_bump(args: Cli, config: Config) -> Option<String> {
 
     for label in order.clone() {
         if let Some(part) = parsed.get_mut(label) {
-            let part_cfg = part_configs.get(label);
+            let part_cfg = part_configs.as_ref().and_then(|c| c.get(label));
 
             if label == args.bump {
                 match part_cfg