Warn when a user creates a new project inside a exisiting git repo

loco-cli/src/bin/main.rs

@@ -46,6 +46,10 @@ fn main() -> eyre::Result<()> {
 
     let res = match cli.command {
         Commands::New { path } => {
+            if git::is_a_git_repo(&path).unwrap_or(false) {
+                prompt::warn_if_in_git_repo()?;
+            }
+
             let app = prompt::app_name()?;
 
             let args = generate::ArgsPlaceholder {

loco-cli/src/git.rs

@@ -144,6 +144,23 @@ fn git_exists() -> bool {
     }
 }
 
+pub fn is_a_git_repo(destination_path: &PathBuf) -> eyre::Result<bool> {
+    let destination_path = destination_path.canonicalize()?;
+    match Command::new("git")
+        .arg("-C")
+        .arg(destination_path)
+        .arg("rev-parse")
+        .arg("--is-inside-work-tree")
+        .output()
+    {
+        Ok(output) => Ok(output.status.success()),
+        Err(err) => {
+            tracing::debug!(error = err.to_string(), "git not found");
+            Ok(false)
+        }
+    }
+}
+
 #[cfg(feature = "git2")]
 fn clone_repo_with_git2(temp_clone_dir: &Path) -> eyre::Result<()> {
     let mut fetch_options = git2::FetchOptions::new();

loco-cli/src/prompt.rs

@@ -78,6 +78,36 @@ pub fn template_selection(
     }
 }
 
+/// Warn the user if they are inside a git repository.
+///
+/// If the `ALLOW_IN_GIT_REPO` environment variable is set, this test will be skipped.
+/// If the environment variable is not set, the function will warn the user if they are inside a git
+/// and will let them cancel the operation or continue.
+///
+/// # Errors
+/// when could not prompt the question, or when the user choose not to continue.
+pub fn warn_if_in_git_repo() -> eyre::Result<()> {
+    if let Ok(_) = env::var("ALLOW_IN_GIT_REPO") {
+        return Ok(());
+    }
+
+    let question = requestty::Question::confirm("allow_git_repo")
+        .message("❯ You are inside a git repository. Do you wish to continue?")
+        .default(false)
+        .build();
+
+    let res = requestty::prompt_one(question)?;
+    let answer = res
+        .as_bool()
+        .ok_or_else(|| eyre::eyre!("allow_git_repo is empty"))?;
+
+    if answer {
+        Ok(())
+    } else {
+        Err(eyre::eyre!("user choose not to continue"))
+    }
+}
+
 /// Validates the provided application name for compatibility with Rust library conventions.
 ///
 /// Rust library names should adhere to specific conventions and avoid special characters to