feat: Add configuration for add_newline (#116)

- Replace TableExt with a Config trait that extends toml::value::Table
Add configuration for add_newline
- add_newline is a root-level configuration value. When set to false, the initial newline before the prompt is removed.

src/config.rs

@@ -2,25 +2,33 @@ use crate::utils;
 use std::env;
 
 use dirs::home_dir;
+use toml::value::Table;
 
-pub struct Config {
-    data: toml::value::Table,
+pub trait Config {
+    fn initialize() -> Table;
+    fn config_from_file() -> Option<Table>;
+    fn get_module_config(&self, module_name: &str) -> Option<&Table>;
+
+    // Config accessor methods
+    fn get_as_bool(&self, key: &str) -> Option<bool>;
+    fn get_as_str(&self, key: &str) -> Option<&str>;
+
+    // Internal implementation for accessors
+    fn get_config(&self, key: &str) -> Option<&toml::value::Value>;
 }
 
-impl Config {
+impl Config for Table {
     /// Initialize the Config struct
-    pub fn initialize() -> Config {
-        if let Some(file_data) = Config::config_from_file() {
-            return Config { data: file_data };
+    fn initialize() -> Table {
+        if let Some(file_data) = Table::config_from_file() {
+            return file_data;
         }
 
-        Config {
-            data: toml::value::Table::new(),
-        }
+        Table::new()
     }
 
     /// Create a config from a starship configuration file
-    fn config_from_file() -> Option<toml::value::Table> {
+    fn config_from_file() -> Option<Table> {
         let file_path = match env::var("STARSHIP_CONFIG") {
             Ok(path) => {
                 // Use $STARSHIP_CONFIG as the config path if available
@@ -55,9 +63,8 @@ impl Config {
     }
 
     /// Get the subset of the table for a module by its name
-    pub fn get_module_config(&self, module_name: &str) -> Option<&toml::value::Table> {
+    fn get_module_config(&self, module_name: &str) -> Option<&toml::value::Table> {
         let module_config = self
-            .data
             .get(module_name)
             .map(toml::Value::as_table)
             .unwrap_or(None);
@@ -74,16 +81,7 @@ impl Config {
 
         module_config
     }
-}
 
-/// Extends `toml::value::Table` with useful methods
-pub trait TableExt {
-    fn get_config(&self, key: &str) -> Option<&toml::value::Value>;
-    fn get_as_bool(&self, key: &str) -> Option<bool>;
-    fn get_as_str(&self, key: &str) -> Option<&str>;
-}
-
-impl TableExt for toml::value::Table {
     /// Get the config value for a given key
     fn get_config(&self, key: &str) -> Option<&toml::value::Value> {
         log::trace!("Looking for config key \"{}\"", key);

src/context.rs

@@ -1,4 +1,4 @@
-use crate::config::{Config, TableExt};
+use crate::config::Config;
 use crate::module::Module;
 
 use clap::ArgMatches;
@@ -13,7 +13,7 @@ use std::path::PathBuf;
 /// of the prompt.
 pub struct Context<'a> {
     /// The deserialized configuration map from the user's `starship.toml` file.
-    pub config: Config,
+    pub config: toml::value::Table,
 
     /// The current working directory that starship is being called in.
     pub current_dir: PathBuf,
@@ -51,7 +51,7 @@ impl<'a> Context<'a> {
     where
         T: Into<PathBuf>,
     {
-        let config = Config::initialize();
+        let config = toml::value::Table::initialize();
 
         // TODO: Currently gets the physical directory. Get the logical directory.
         let current_dir = Context::expand_tilde(dir.into());

src/module.rs

@@ -1,4 +1,4 @@
-use crate::config::TableExt;
+use crate::config::Config;
 use crate::segment::Segment;
 use ansi_term::Style;
 use ansi_term::{ANSIString, ANSIStrings};

src/print.rs

@@ -2,6 +2,7 @@ use clap::ArgMatches;
 use rayon::prelude::*;
 use std::io::{self, Write};
 
+use crate::config::Config;
 use crate::context::Context;
 use crate::module::Module;
 use crate::modules;
@@ -23,12 +24,15 @@ const PROMPT_ORDER: &[&str] = &[
 
 pub fn prompt(args: ArgMatches) {
     let context = Context::new(args);
+    let config = &context.config;
 
     let stdout = io::stdout();
     let mut handle = stdout.lock();
 
     // Write a new line before the prompt
-    writeln!(handle).unwrap();
+    if config.get_as_bool("add_newline") != Some(false) {
+        writeln!(handle).unwrap();
+    }
 
     let modules = PROMPT_ORDER
         .par_iter()