1 files changed, 145 insertions, 0 deletions
diff --git a/src/dev/new.rs b/src/dev/new.rs
new file mode 100644
index 0000000..fefc4fc
--- /dev/null
+++ b/src/dev/new.rs
@@ -0,0 +1,145 @@
+use anyhow::{bail, Context, Result};
+use std::{
+    env::set_current_dir,
+    fs::{self, create_dir},
+    path::Path,
+    process::Command,
+};
+
+use crate::CURRENT_FORMAT_VERSION;
+
+// Create a directory relative to the current directory and print its path.
+fn create_rel_dir(dir_name: &str, current_dir: &str) -> Result<()> {
+    create_dir(dir_name)
+        .with_context(|| format!("Failed to create the directory {current_dir}/{dir_name}"))?;
+    println!("Created the directory {current_dir}/{dir_name}");
+    Ok(())
+}
+
+// Write a file relative to the current directory and print its path.
+fn write_rel_file<C>(file_name: &str, current_dir: &str, content: C) -> Result<()>
+where
+    C: AsRef<[u8]>,
+{
+    fs::write(file_name, content)
+        .with_context(|| format!("Failed to create the file {current_dir}/{file_name}"))?;
+    // Space to align with `create_rel_dir`.
+    println!("Created the file      {current_dir}/{file_name}");
+    Ok(())
+}
+
+pub fn new(path: &Path, no_git: bool) -> Result<()> {
+    let dir_path_str = path.to_string_lossy();
+
+    create_dir(path).with_context(|| format!("Failed to create the directory {dir_path_str}"))?;
+    println!("Created the directory {dir_path_str}");
+
+    set_current_dir(path)
+        .with_context(|| format!("Failed to set {dir_path_str} as the current directory"))?;
+
+    if !no_git
+        && !Command::new("git")
+            .arg("init")
+            .status()
+            .context("Failed to run `git init`")?
+            .success()
+    {
+        bail!("`git init` didn't run successfully. See the possible error message above");
+    }
+
+    write_rel_file(".gitignore", &dir_path_str, GITIGNORE)?;
+
+    create_rel_dir("exercises", &dir_path_str)?;
+    create_rel_dir("solutions", &dir_path_str)?;
+
+    write_rel_file(
+        "info.toml",
+        &dir_path_str,
+        format!("{INFO_FILE_BEFORE_FORMAT_VERSION}{CURRENT_FORMAT_VERSION}{INFO_FILE_AFTER_FORMAT_VERSION}"),
+    )?;
+
+    write_rel_file("Cargo.toml", &dir_path_str, CARGO_TOML)?;
+
+    write_rel_file("README.md", &dir_path_str, README)?;
+
+    create_rel_dir(".vscode", &dir_path_str)?;
+    write_rel_file(
+        ".vscode/extensions.json",
+        &dir_path_str,
+        crate::init::VS_CODE_EXTENSIONS_JSON,
+    )?;
+
+    println!("\nInitialization done ✓");
+
+    Ok(())
+}
+
+pub const GITIGNORE: &[u8] = b".rustlings-state.txt
+Cargo.lock
+target
+.vscode
+!.vscode/extensions.json
+";
+
+const INFO_FILE_BEFORE_FORMAT_VERSION: &str =
+    "# The format version is an indicator of the compatibility of third-party exercises with the
+# Rustlings program.
+# The format version is not the same as the version of the Rustlings program.
+# In case Rustlings makes an unavoidable breaking change to the expected format of third-party
+# exercises, you would need to raise this version and adapt to the new format.
+# Otherwise, the newest version of the Rustlings program won't be able to run these exercises.
+format_version = ";
+
+const INFO_FILE_AFTER_FORMAT_VERSION: &str = r#"
+
+# Optional multi-line message to be shown to users when just starting with the exercises.
+welcome_message = """Welcome to these third-party Rustlings exercises."""
+
+# Optional multi-line message to be shown to users after finishing all exercises.
+final_message = """We hope that you found the exercises helpful :D"""
+
+# Repeat this section for every exercise.
+[[exercises]]
+# Exercise name which is the exercise file name without the `.rs` extension.
+name = "???"
+
+# Optional directory name to be provided if you want to organize exercises in directories.
+# If `dir` is specified, the exercise path is `exercises/DIR/NAME.rs`
+# Otherwise, the path is `exercises/NAME.rs`
+# dir = "???"
+
+# Rustlings expects the exercise to contain tests and run them.
+# You can optionally disable testing by setting `test` to `false` (the default is `true`).
+# In that case, the exercise will be considered done when it just successfully compiles.
+# test = true
+
+# Rustlings will always run Clippy on exercises.
+# You can optionally set `strict_clippy` to `true` (the default is `false`) to only consider
+# the exercise as done when there are no warnings left.
+# strict_clippy = false
+
+# A multi-line hint to be shown to users on request.
+hint = """???"""
+"#;
+
+const CARGO_TOML: &[u8] =
+    br#"# Don't edit the `bin` list manually! It is updated by `rustlings dev update`
+bin = []
+
+[package]
+name = "exercises"
+edition = "2021"
+# Don't publish the exercises on crates.io!
+publish = false
+
+[dependencies]
+"#;
+
+const README: &str = "# Rustlings 🦀
+
+Welcome to these third-party Rustlings exercises 😃
+
+First, [install Rustlings using the official instructions in the README of the Rustlings project](https://github.com/rust-lang/rustlings) ✅
+
+Then, open your terminal in this directory and run `rustlings` to get started with the exercises 🚀
+";