1 files changed, 109 insertions, 0 deletions
diff --git a/src/dev/new.rs b/src/dev/new.rs
new file mode 100644
index 0000000..3ce5055
--- /dev/null
+++ b/src/dev/new.rs
@@ -0,0 +1,109 @@
+use anyhow::{Context, Result};
+use std::fs::{self, create_dir};
+
+use crate::CURRENT_FORMAT_VERSION;
+
+pub fn init() -> Result<()> {
+    create_dir("rustlings").context("Failed to create the directory `rustlings`")?;
+
+    create_dir("rustlings/exercises")
+        .context("Failed to create the directory `rustlings/exercises`")?;
+
+    create_dir("rustlings/solutions")
+        .context("Failed to create the directory `rustlings/solutions`")?;
+
+    fs::write(
+        "rustlings/info.toml",
+        format!("{INFO_FILE_BEFORE_FORMAT_VERSION}{CURRENT_FORMAT_VERSION}{INFO_FILE_AFTER_FORMAT_VERSION}"),
+    )
+    .context("Failed to create the file `rustlings/info.toml`")?;
+
+    fs::write("rustlings/Cargo.toml", CARGO_TOML)
+        .context("Failed to create the file `rustlings/Cargo.toml`")?;
+
+    fs::write("rustlings/.gitignore", crate::init::GITIGNORE)
+        .context("Failed to create the file `rustlings/.gitignore`")?;
+
+    fs::write("rustlings/README.md", README)
+        .context("Failed to create the file `rustlings/README.md`")?;
+
+    create_dir("rustlings/.vscode")
+        .context("Failed to create the directory `rustlings/.vscode`")?;
+    fs::write(
+        "rustlings/.vscode/extensions.json",
+        crate::init::VS_CODE_EXTENSIONS_JSON,
+    )
+    .context("Failed to create the file `rustlings/.vscode/extensions.json`")?;
+
+    println!("{INIT_DONE}");
+
+    Ok(())
+}
+
+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 = "???"
+
+# The mode to run the exercise in.
+# The mode "test" (preferred) runs the exercise's tests.
+# The mode "run" only checks if the exercise compiles and runs it.
+mode = "test"
+
+# 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 = "rustlings"
+edition = "2021"
+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 🚀
+";
+
+const INIT_DONE: &str = r#"Initialization done!
+You can start developing third-party Rustlings exercises in the `rustlings` directory :D
+
+If the initialization was done in a Rust project which is a Cargo workspace, you need to add the
+path to the `rustlings` directory to the `workspace.exclude` list in the project's `Cargo.toml`
+file. For example:
+
+[workspace]
+exclude = ["rustlings"]"#;