From 31b5392f90922ce995ecddf9fc35cfef71c3b58a Mon Sep 17 00:00:00 2001
From: Constantine Evans <constantine@costi.net>
Date: Mon, 20 Apr 2026 16:13:39 +0100
Subject: [PATCH 1/2] Make CSV parsing and polars optional (but default)

If someone is using Optimizer directly, then polars is a giant
dependency that isn't needed.  This makes the file parsing optional (but
enabled by default), which in turn makes polars optional.
---
 crates/coffee/Cargo.toml |  6 +++++-
 crates/coffee/src/lib.rs | 15 +++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/crates/coffee/Cargo.toml b/crates/coffee/Cargo.toml
index 8a551f0..d8cfe68 100644
--- a/crates/coffee/Cargo.toml
+++ b/crates/coffee/Cargo.toml
@@ -3,10 +3,14 @@ name = "coffee"
 version = "0.1.0"
 edition = "2021"
 
+[features]
+default = ["file-input"]
+file-input = ["dep:polars"]
+
 [dependencies]
 ndarray = { version = "0.16.1", features = ["rayon"] }
 csv = "1.1.6"
-polars = { version = "0.23.2", features = ["csv-file"] }
+polars = { version = "0.23.2", features = ["csv-file"], optional = true }
 nalgebra = "0.33.2"
 chrono = "0.4"
 approx = "0.5.1"
diff --git a/crates/coffee/src/lib.rs b/crates/coffee/src/lib.rs
index 5d6f661..b0511fa 100644
--- a/crates/coffee/src/lib.rs
+++ b/crates/coffee/src/lib.rs
@@ -1,24 +1,37 @@
 pub mod extras;
+#[cfg(feature = "file-input")]
 pub mod fileparse;
 pub mod format;
 pub mod optimize;
 pub mod steihaug;
 
+#[cfg(feature = "file-input")]
 use std::fs::File;
+#[cfg(feature = "file-input")]
 use std::io::Read;
 
+#[cfg(feature = "file-input")]
 use extras::{OptimizerArgs, OptimizerResults};
+#[cfg(feature = "file-input")]
 use fileparse::{parse_float, read_inputs_to_dataframe};
+#[cfg(feature = "file-input")]
 use format::results_message;
+#[cfg(feature = "file-input")]
 use ndarray::{Array1, Array2};
+#[cfg(feature = "file-input")]
 use optimize::Optimizer;
 
+#[cfg(feature = "file-input")]
 use core::result::Result;
+#[cfg(feature = "file-input")]
 use std::error::Error;
+#[cfg(feature = "file-input")]
 use std::io::Write;
 
+#[cfg(feature = "file-input")]
 use polars::prelude::DataType;
 
+#[cfg(feature = "file-input")]
 fn run_coffee_computation(
     cfe_bytes: &[u8],
     con_bytes: &[u8],
@@ -78,6 +91,7 @@ fn run_coffee_computation(
     Ok(optimizer.get_results())
 }
 
+#[cfg(feature = "file-input")]
 pub fn run_coffee_server(cfe_bytes: &[u8], con_bytes: &[u8]) -> Result<String, Box<dyn Error>> {
     let args = OptimizerArgs {
         use_terminal: true, // print to logs for websocket version
@@ -95,6 +109,7 @@ pub fn run_coffee_server(cfe_bytes: &[u8], con_bytes: &[u8]) -> Result<String, B
     Ok(results_message(&optimizer_results))
 }
 
+#[cfg(feature = "file-input")]
 pub fn run_coffee(
     file_path_cfe: &str,
     file_path_con: &str,

From 6fdcd67a5e50a306b038c22f4e4d7547c1668261 Mon Sep 17 00:00:00 2001
From: Constantine Evans <constantine@costi.net>
Date: Mon, 20 Apr 2026 16:32:01 +0100
Subject: [PATCH 2/2] Bump ndarray to 0.17

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 crates/coffee/Cargo.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/coffee/Cargo.toml b/crates/coffee/Cargo.toml
index d8cfe68..d72e53c 100644
--- a/crates/coffee/Cargo.toml
+++ b/crates/coffee/Cargo.toml
@@ -8,7 +8,7 @@ default = ["file-input"]
 file-input = ["dep:polars"]
 
 [dependencies]
-ndarray = { version = "0.16.1", features = ["rayon"] }
+ndarray = { version = "0.17", features = ["rayon"] }
 csv = "1.1.6"
 polars = { version = "0.23.2", features = ["csv-file"], optional = true }
 nalgebra = "0.33.2"