fix(preset): add output-flag to avoid encoding issues (#4926)

build.rs

@@ -34,24 +34,12 @@ fn gen_presets_hook(mut file: &File) -> SdResult<()> {
             .and_then(|v| v.strip_suffix(".toml"))
             .expect("Failed to process filename");
         presets.push_str(format!("print::Preset(\"{name}\"),\n").as_str());
-        match_arms.push_str(
-            format!(
-                r#"
-"{name}" => {{
-        let stdout = io::stdout();
-        let mut stdout = stdout.lock();
-        let _ = stdout.write_all(include_bytes!(r"{full_path}"));
-}}
-"#
-            )
-            .as_str(),
-        );
+        match_arms.push_str(format!(r#""{name}" => include_bytes!(r"{full_path}"),"#).as_str());
     }
 
     writeln!(
         file,
         r#"
-use std::io::{{self, Write}};
 use crate::print;
 
 pub fn get_preset_list<'a>() -> &'a [print::Preset] {{
@@ -60,10 +48,10 @@ pub fn get_preset_list<'a>() -> &'a [print::Preset] {{
     ]
 }}
 
-pub fn print_preset_content(name: &str) {{
+pub fn get_preset_content(name: &str) -> &[u8] {{
     match name {{
     {match_arms}
-    _ => {{}}
+    _ => unreachable!(),
     }}
 }}
 "#

docs/presets/bracketed-segments.md

@@ -10,7 +10,7 @@ in brackets instead of using the default Starship wording ("via", "on", etc.).
 ### Configuration
 
 ```sh
-starship preset bracketed-segments > ~/.config/starship.toml
+starship preset bracketed-segments -o ~/.config/starship.toml
 ```
 
 [Click to download TOML](/presets/toml/bracketed-segments.toml)

docs/presets/nerd-font.md

@@ -13,7 +13,7 @@ This preset changes the symbols for each module to use Nerd Font symbols.
 ### Configuration
 
 ```sh
-starship preset nerd-font-symbols > ~/.config/starship.toml
+starship preset nerd-font-symbols -o ~/.config/starship.toml
 ```
 
 [Click to download TOML](/presets/toml/nerd-font-symbols.toml)

docs/presets/no-empty-icons.md

@@ -9,7 +9,7 @@ If toolset files are identified the toolset icon is displayed. If the toolset is
 ### Configuration
 
 ```sh
-starship preset no-empty-icons > ~/.config/starship.toml
+starship preset no-empty-icons -o ~/.config/starship.toml
 ```
 
 [Click to download TOML](/presets/toml/no-empty-icons.toml)

docs/presets/no-nerd-font.md

@@ -12,7 +12,7 @@ This preset will become the default preset in a future release of starship.
 ### Configuration
 
 ```sh
-starship preset no-nerd-font > ~/.config/starship.toml
+starship preset no-nerd-font -o ~/.config/starship.toml
 ```
 
 [Click to download TOML](/presets/toml/no-nerd-font.toml)

docs/presets/no-runtimes.md

@@ -9,7 +9,7 @@ This preset hides the version of language runtimes. If you work in containers or
 ### Configuration
 
 ```sh
-starship preset no-runtime-versions > ~/.config/starship.toml
+starship preset no-runtime-versions -o ~/.config/starship.toml
 ```
 
 [Click to download TOML](/presets/toml/no-runtime-versions.toml)

docs/presets/pastel-powerline.md

@@ -14,7 +14,7 @@ It also shows how path substitution works in starship.
 ### Configuration
 
 ```sh
-starship preset pastel-powerline > ~/.config/starship.toml
+starship preset pastel-powerline -o ~/.config/starship.toml
 ```
 
 [Click to download TOML](/presets/toml/pastel-powerline.toml)

docs/presets/plain-text.md

@@ -10,7 +10,7 @@ don't have access to Unicode.
 ### Configuration
 
 ```sh
-starship preset plain-text-symbols > ~/.config/starship.toml
+starship preset plain-text-symbols -o ~/.config/starship.toml
 ```
 
 [Click to download TOML](/presets/toml/plain-text-symbols.toml)

docs/presets/pure-preset.md

@@ -9,7 +9,7 @@ This preset emulates the look and behavior of [Pure](https://github.com/sindreso
 ### Configuration
 
 ```sh
-starship preset pure-preset > ~/.config/starship.toml
+starship preset pure-preset -o ~/.config/starship.toml
 ```
 
 [Click to download TOML](/presets/toml/pure-preset.toml)

docs/presets/tokyo-night.md

@@ -13,7 +13,7 @@ This preset is inspired by [tokyo-night-vscode-theme](https://github.com/enkia/t
 ### Configuration
 
 ```sh
-starship preset tokyo-night > ~/.config/starship.toml
+starship preset tokyo-night -o ~/.config/starship.toml
 ```
 
 [Click to download TOML](/presets/toml/tokyo-night.toml)

src/main.rs

@@ -2,6 +2,7 @@
 
 use clap::crate_authors;
 use std::io;
+use std::path::PathBuf;
 use std::thread::available_parallelism;
 use std::time::SystemTime;
 
@@ -68,6 +69,9 @@ enum Commands {
         /// The name of preset to be printed
         #[clap(required_unless_present("list"), value_enum)]
         name: Option<print::Preset>,
+        /// Output the preset to a file instead of stdout
+        #[clap(short, long, conflicts_with = "list")]
+        output: Option<PathBuf>,
         /// List out all preset names
         #[clap(short, long)]
         list: bool,
@@ -202,7 +206,7 @@ fn main() {
                 print::module(&module_name, properties);
             }
         }
-        Commands::Preset { name, list } => print::preset_command(name, list),
+        Commands::Preset { name, list, output } => print::preset_command(name, output, list),
         Commands::Config { name, value } => {
             if let Some(name) = name {
                 if let Some(value) = value {

src/print.rs

@@ -4,6 +4,7 @@ use rayon::prelude::*;
 use std::collections::BTreeSet;
 use std::fmt::{Debug, Write as FmtWrite};
 use std::io::{self, Write};
+use std::path::PathBuf;
 use std::time::Duration;
 use terminal_size::terminal_size;
 use unicode_segmentation::UnicodeSegmentation;
@@ -464,13 +465,22 @@ impl ValueEnum for Preset {
     }
 }
 
-pub fn preset_command(name: Option<Preset>, list: bool) {
+pub fn preset_command(name: Option<Preset>, output: Option<PathBuf>, list: bool) {
     if list {
         println!("{}", preset_list());
         return;
     }
     let variant = name.expect("name argument must be specified");
-    shadow::print_preset_content(variant.0);
+    let content = shadow::get_preset_content(variant.0);
+    if let Some(output) = output {
+        if let Err(err) = std::fs::write(output, content) {
+            eprintln!("Error writing preset to file: {err}");
+            std::process::exit(1);
+        }
+    } else if let Err(err) = std::io::stdout().write_all(content) {
+        eprintln!("Error writing preset to stdout: {err}");
+        std::process::exit(1);
+    }
 }
 
 fn preset_list() -> String {
@@ -485,6 +495,7 @@ mod test {
     use super::*;
     use crate::config::StarshipConfig;
     use crate::test::default_context;
+    use crate::utils;
 
     #[test]
     fn main_prompt() {
@@ -595,10 +606,23 @@ mod test {
 
     #[test]
     fn preset_command_does_not_panic_on_correct_inputs() {
-        preset_command(None, true);
+        preset_command(None, None, true);
         Preset::value_variants()
             .iter()
-            .for_each(|v| preset_command(Some(v.clone()), false));
+            .for_each(|v| preset_command(Some(v.clone()), None, false));
+    }
+
+    #[test]
+    fn preset_command_output_to_file() -> std::io::Result<()> {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("preset.toml");
+        preset_command(Some(Preset("nerd-font-symbols")), Some(path.clone()), false);
+
+        let actual = utils::read_file(&path)?;
+        let expected = include_str!("../docs/.vuepress/public/presets/toml/nerd-font-symbols.toml");
+        assert_eq!(actual, expected);
+
+        dir.close()
     }
 
     #[test]