Feature: Make Rust crate generation configurable

- Add [code] enable_rust_crates = true (default) in config.
- Allows opting out of subdir structure for Rust.
- Updates paths and creation logic accordingly.
- Fix serde attribute for the new field.

Author: Antonio Bennett

src/cmds/edit.rs

@@ -108,7 +108,7 @@ use std::path::Path;
 
 let question: Question = qr?;
 
-if *lang == "rust" {
+if *lang == "rust" && conf.code.enable_rust_crates {
     let flat_suffix = suffix(&lang).map_err(anyhow::Error::msg)?;  // Since suffix returns Result<&str>
     let pick_replaced = conf.code.pick.replace("${fid}", &problem.fid.to_string()).replace("${slug}", &problem.slug.to_string());
     let flat_path_str = format!("{}/{}.{}", conf.storage.code()?, pick_replaced, flat_suffix);

src/config/code.rs

@@ -9,6 +9,10 @@ fn default_submission() -> String {
     "${fid}.${slug}.${sid}.${ac}".into()
 }
 
+fn default_enable_rust_crates() -> bool {
+    true
+}
+
 /// Code config
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct Code {
@@ -34,6 +38,7 @@ pub struct Code {
     pub comment_leading: String,
     #[serde(default, skip_serializing)]
     pub test: bool,
+    pub enable_rust_crates: bool,
     pub lang: String,
     #[serde(default = "default_pick", skip_serializing)]
     pub pick: String,
@@ -55,6 +60,7 @@ impl Default for Code {
             comment_problem_desc: false,
             comment_leading: "".into(),
             test: true,
+            enable_rust_crates: default_enable_rust_crates(),
             lang: "rust".into(),
             pick: "${fid}.${slug}".into(),
             submission: "${fid}.${slug}.${sid}.${ac}".into(),

src/helper.rs

@@ -197,9 +197,10 @@ mod file {
 pub fn test_cases_path(problem: &Problem) -> crate::Result<String> {
     let conf = crate::config::Config::locate()?;
     let lang = conf.code.lang.clone();
+    let use_crates = conf.code.enable_rust_crates;
     let code_base = conf.storage.code()?;
 
-    let path = if lang == "rust" {
+    let path = if lang == "rust" && use_crates {
         let sanitized_slug = problem.slug.to_lowercase().replace(|c: char| !c.is_alphanumeric(), "_");
         let subdir = format!("{}-{}/tests.dat", problem.fid, sanitized_slug);
         format!("{}/{}", code_base, subdir)
@@ -221,9 +222,10 @@ pub fn code_path(problem: &Problem, l: Option<String>) -> crate::Result<String>
         lang = lang_opt;
     }
 
+    let use_crates = conf.code.enable_rust_crates;
     let code_base = conf.storage.code()?;
 
-    let path = if lang == "rust" {
+    let path = if lang == "rust" && use_crates {
         let sanitized_slug = problem.slug.to_lowercase().replace(|c: char| !c.is_alphanumeric(), "_");
         let subdir = format!("{}-{}/src/lib.rs", problem.fid, sanitized_slug);
         format!("{}/{}", code_base, subdir)