Add 'indent_str' option to Config to change the indent type (#24)

Two spaces remains the default. To make the builder more intuitive this
adds a depedency on the TypedBuilder crate.

Author: nvll

Cargo.lock

@@ -19,6 +19,7 @@ serde = { version = "1.0", features = ["derive"] }
 similar = "2.2.1"
 toml = "0.7.6"
 tree-sitter = "0.20.10"
+typed-builder = "0.21.1"
 
 [build-dependencies]
 cc="*"

Cargo.toml

@@ -2,16 +2,23 @@ use std::fs;
 use std::path::{Path, PathBuf};
 
 use serde::Deserialize;
+use typed_builder::TypedBuilder;
 
 use crate::layouts::KeyboardLayoutType;
 
 mod constants;
 
-#[derive(Deserialize, Default)]
+#[derive(Default, Deserialize, TypedBuilder)]
 pub struct Config {
+    #[builder(default)]
     #[serde(default)]
     pub layout: KeyboardLayoutType,
 
+    #[builder(default_code = "Config::default_indent_str()")]
+    #[serde(default = "Config::default_indent_str")]
+    pub indent_str: String,
+
+    #[builder(default)]
     #[serde(default)]
     pub warn_on_unhandled_tokens: bool,
 }
@@ -26,6 +33,10 @@ impl Config {
             Self::default()
         }
     }
+
+    pub fn default_indent_str() -> String {
+        "  ".to_owned()
+    }
 }
 
 fn find_rc_file(path: &Path) -> Option<PathBuf> {

src/config/mod.rs

@@ -418,7 +418,8 @@ pub fn print(source: &String, config: &Config) -> String {
     let tree = parse(source.clone());
     let mut cursor = tree.walk();
 
-    let ctx = Context { indent: 0, keymap: false, bindings: false, config };
+    let ctx =
+        Context { indent: 0, bindings: false, keymap: false, config: config };
 
     // The first node is the root document node, so we have to traverse all it's
     // children with the same indentation level.

src/printer.rs

@@ -49,10 +49,7 @@ pub fn run_specs(directory_path: &Path) {
     let specs = get_specs_in_dir(directory_path);
     let test_count = specs.len();
     let mut failed_tests = Vec::new();
-    let config = Config {
-        layout: KeyboardLayoutType::Adv360,
-        warn_on_unhandled_tokens: false,
-    };
+    let config = Config::builder().layout(KeyboardLayoutType::Adv360).build();
 
     for (_, spec) in specs {
         let result = print(&spec.file_text, &config);

src/test_utils/spec_helpers.rs

@@ -31,7 +31,7 @@ pub fn lookahead<'a>(cursor: &'a TreeCursor) -> Option<Node<'a>> {
 }
 
 pub fn print_indent(writer: &mut String, ctx: &Context) {
-    writer.push_str("  ".repeat(ctx.indent).as_str());
+    writer.push_str(&ctx.config.indent_str.repeat(ctx.indent));
 }
 
 pub fn sep(writer: &mut String) {