yeah

.envrc

@@ -0,0 +1 @@
+use nix

.gitignore

@@ -0,0 +1,4 @@
+.direnv/
+target/
+.~lock*
+*.csv

Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "canvas_grades"
+version = "0.0.1"
+authors = [ "Aly Sewelam <linlysmolworthy@gmail.com>" ]
+edition = "2024"
+
+[dependencies]
+polars = {version = "0.53.0", features = ["csv", "lazy"] }
+

shell.nix

@@ -0,0 +1,14 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    rustup
+    pkg-config
+    openssl
+  ];
+
+  shellHook = ''
+    rustup toolchain install stable
+    rustup default stable
+  '';
+}

src/main.rs

@@ -0,0 +1,42 @@
+use polars::prelude::*;
+
+fn main() -> Result<(), PolarsError> {
+    // Read CSVs
+    let students = CsvReadOptions::default()
+        .with_has_header(true)
+        .try_into_reader_with_file_path(Some("final_students.csv".into()))?
+        .finish()?;
+
+    let grades = CsvReadOptions::default()
+        .with_has_header(true)
+        .try_into_reader_with_file_path(Some("final_grades.csv".into()))?
+        .finish()?;
+
+    // Join on "email", keep id + lab columns
+    let result = students
+        .join(
+            &grades,
+            ["email"],
+            ["email"],
+            JoinArgs::new(JoinType::Inner),
+            None,
+        )?
+        .lazy()
+        .with_column(((col("Activity 1") + col("Activity 2")) / lit(2.0)).alias("Activities"))
+        .collect()?
+        .select([
+            "ID",
+            "Course Assessment",
+            "Activities",
+            "Knowledge Checks",
+        ])?;
+
+    println!("{}", result);
+
+    // Write output
+    let mut file = std::fs::File::create("output2.csv").unwrap();
+    CsvWriter::new(&mut file).finish(&mut result.clone())?;
+
+    println!("Written to output.csv");
+    Ok(())
+}