Make gen-dev-cargo-toml a separate package

so that `cargo install` only installs `rustlings`

2 files changed, 74 insertions, 0 deletions

diff --git a/gen-dev-cargo-toml/Cargo.toml b/gen-dev-cargo-toml/Cargo.toml
new file mode 100644
index 0000000..8922ae8
--- /dev/null
+++ b/gen-dev-cargo-toml/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "gen-dev-cargo-toml"
+publish = false
+license.workspace = true
+edition.workspace = true
+
+[dependencies]
+anyhow.workspace = true
+serde.workspace = true
+toml_edit.workspace = true
diff --git a/gen-dev-cargo-toml/src/main.rs b/gen-dev-cargo-toml/src/main.rs
new file mode 100644
index 0000000..622762a
--- /dev/null
+++ b/gen-dev-cargo-toml/src/main.rs
@@ -0,0 +1,64 @@
+// Generates `dev/Cargo.toml` such that it is synced with `info.toml`.
+// `dev/Cargo.toml` is a hack to allow using `cargo run` to test `rustlings`
+// during development.
+
+use anyhow::{bail, Context, Result};
+use serde::Deserialize;
+use std::{
+    fs::{self, create_dir},
+    io::ErrorKind,
+};
+
+#[derive(Deserialize)]
+struct Exercise {
+    name: String,
+    path: String,
+}
+
+#[derive(Deserialize)]
+struct InfoToml {
+    exercises: Vec<Exercise>,
+}
+
+fn main() -> Result<()> {
+    let exercises = toml_edit::de::from_str::<InfoToml>(
+        &fs::read_to_string("info.toml").context("Failed to read `info.toml`")?,
+    )
+    .context("Failed to deserialize `info.toml`")?
+    .exercises;
+
+    let mut buf = Vec::with_capacity(1 << 14);
+
+    buf.extend_from_slice(
+        b"# This file is a hack to allow using `cargo run` to test `rustlings` during development.
+# You shouldn't edit it manually. It is created and updated by running `cargo run -p gen-dev-cargo-toml`.
+
+bin = [\n",
+    );
+
+    for exercise in exercises {
+        buf.extend_from_slice(b"  { name = \"");
+        buf.extend_from_slice(exercise.name.as_bytes());
+        buf.extend_from_slice(b"\", path = \"../");
+        buf.extend_from_slice(exercise.path.as_bytes());
+        buf.extend_from_slice(b"\" },\n");
+    }
+
+    buf.extend_from_slice(
+        br#"]
+
+[package]
+name = "rustlings"
+edition = "2021"
+publish = false
+"#,
+    );
+
+    if let Err(e) = create_dir("dev") {
+        if e.kind() != ErrorKind::AlreadyExists {
+            bail!("Failed to create the `dev` directory: {e}");
+        }
+    }
+
+    fs::write("dev/Cargo.toml", buf).context("Failed to write `dev/Cargo.toml`")
+}