fix: re-add add_newline to root config (starship#1598)

docs/config/README.md

@@ -1,23 +1,15 @@
 # Configuration
 
-::: tip
-
-🔥 Configuration is currently being worked on.
-Many new configuration options will be available in coming releases.
-
-:::
-
 To get started configuring starship, create the following file: `~/.config/starship.toml`.
 
 ```sh
 mkdir -p ~/.config && touch ~/.config/starship.toml
 ```
 
 All configuration for starship is done in this [TOML](https://github.com/toml-lang/toml) file:
-
 ```toml
 # Don't print a new line at the start of the prompt
-format = "$all"
+add_newline = false
 
 # Replace the "❯" symbol in the prompt with "➜"
 [character]                            # The name of the module we are configuring is "character"
@@ -147,15 +139,13 @@ This is the list of prompt-wide configuration options.
 | -------------- | ------------------------------ | ----------------------------------------------------- |
 | `format`       | [link](#default-prompt-format) | Configure the format of the prompt.                   |
 | `scan_timeout` | `30`                           | Timeout for starship to scan files (in milliseconds). |
+| `add_newline`  | `true`                         | Add a new line before the start of the prompt.        |
 
 ### Example
 
 ```toml
 # ~/.config/starship.toml
 
-# Disable the newline at the start of the prompt
-format = "$all"
-
 # Use custom format
 format = """
 [┌───────────────────>](bold green)
@@ -164,14 +154,17 @@ format = """
 
 # Wait 10 milliseconds for starship to check files under the current directory.
 scan_timeout = 10
+
+# Disable the newline at the start of the prompt
+add_newline = false
 ```
 
 ### Default Prompt Format
 
 The default `format` is used to define the format of the prompt, if empty or no `format` is provided. The default is as shown:
 
 ```toml
-format = "\n$all"
+format = "$all"
 
 # Which is equivalent to
 format = """

src/configs/starship_root.rs

@@ -6,6 +6,7 @@ use starship_module_config_derive::ModuleConfig;
 pub struct StarshipRootConfig<'a> {
     pub format: &'a str,
     pub scan_timeout: u64,
+    pub add_newline: bool,
 }
 
 // List of default prompt order
@@ -70,8 +71,9 @@ pub const PROMPT_ORDER: &[&str] = &[
 impl<'a> RootModuleConfig<'a> for StarshipRootConfig<'a> {
     fn new() -> Self {
         StarshipRootConfig {
-            format: "\n$all",
+            format: "$all",
             scan_timeout: 30,
+            add_newline: true,
         }
     }
 }

src/print.rs

@@ -72,6 +72,9 @@ pub fn get_prompt(context: Context) -> String {
     );
 
     let module_strings = root_module.ansi_strings_for_shell(context.shell);
+    if config.add_newline {
+        writeln!(buf).unwrap();
+    }
     write!(buf, "{}", ANSIStrings(&module_strings)).unwrap();
 
     buf