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Hassan Abedi 2026-03-24 09:50:06 +01:00
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# https://EditorConfig.org
root = true
[*]
charset = utf-8
end_of_line = lf
indent_style = space
indent_size = 4
insert_final_newline = true
trim_trailing_whitespace = true
[*.rs]
max_line_length = 100
[*.{py,pyi}]
max_line_length = 100
[*.md]
max_line_length = 150
trim_trailing_whitespace = false
[*.sh]
indent_size = 2
[*.{yaml,yml}]
indent_size = 2

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# Normalize all text files to LF line endings
* text=auto eol=lf
# Go source files
*.go text
*.mod text
*.sum text
# Markdown and documentation files
*.md text
*.rst text
# JSON, YAML, and configuration files
*.json text
*.yaml text
*.yml text
*.toml text
# Shell scripts
*.sh text eol=lf
# Static files
*.html text
*.css text
*.js text
*.svg text
*.xml text
# Large assets (use Git LFS)
*.png filter=lfs diff=lfs merge=lfs -text
*.jpg filter=lfs diff=lfs merge=lfs -text
*.jpeg filter=lfs diff=lfs merge=lfs -text
*.gif filter=lfs diff=lfs merge=lfs -text
*.ico filter=lfs diff=lfs merge=lfs -text
*.mp4 filter=lfs diff=lfs merge=lfs -text
*.mov filter=lfs diff=lfs merge=lfs -text
*.zip filter=lfs diff=lfs merge=lfs -text
*.tar filter=lfs diff=lfs merge=lfs -text
*.gz filter=lfs diff=lfs merge=lfs -text
*.tgz filter=lfs diff=lfs merge=lfs -text
# Font files (binary, tracked via LFS)
*.ttf filter=lfs diff=lfs merge=lfs -text
*.woff filter=lfs diff=lfs merge=lfs -text
*.woff2 filter=lfs diff=lfs merge=lfs -text
# Build artifacts (binary, optional LFS tracking)
*.exe filter=lfs diff=lfs merge=lfs -text
*.dll filter=lfs diff=lfs merge=lfs -text
*.so filter=lfs diff=lfs merge=lfs -text
*.out filter=lfs diff=lfs merge=lfs -text
*.a filter=lfs diff=lfs merge=lfs -text
*.o filter=lfs diff=lfs merge=lfs -text

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# Python specific
__pycache__/
*.py[cod]
*$py.class
# Virtual environments
.env/
env/
.venv/
venv/
# Packaging and distribution files
.Python
build/
dist/
*.egg-info/
*.egg
MANIFEST
# Dependency directories
develop-eggs/
downloads/
eggs/
.eggs/
lib/
lib64/
parts/
sdist/
var/
wheels/
.installed.cfg
# Test and coverage reports
htmlcov/
.tox/
.coverage
.coverage.*
.cache
nosetests.xml
coverage.xml
*.cover
.hypothesis/
.pytest_cache/
# IDE specific files and directories
.idea/
*.iml
.vscode/
# Jupyter Notebook files
.ipynb_checkpoints
# Temporary files created by editors and the system and folders to ignore
*.swp
*~
*.bak
*.tmp
temp/
tmp/
# Database files (SQLite, DuckDB, etc.)
*.duckdb
*.db
*.wal
*.sqlite
# Dependency lock files (uncomment to ignore)
poetry.lock
# Rust specific
/target/
.cargo-ok
cobertura.xml
tarpaulin-report.html
# Comment out the next line if you want to checkin your lock file for Cargo
Cargo.lock
# Miscellaneous files and directories to ignore
# Add any additional file patterns a directory names that should be ignored down here
.DS_Store
tests/testdata/*.csv
tests/testdata/*.parquet
.benchmarks
.env

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default_stages: [ pre-push ]
fail_fast: false
exclude: '^(benches/|tests/|examples/|docs/)'
repos:
- repo: https://github.com/pre-commit/pre-commit-hooks
rev: v5.0.0
hooks:
- id: trailing-whitespace
args: [ --markdown-linebreak-ext=md ]
- id: end-of-file-fixer
- id: mixed-line-ending
- id: check-merge-conflict
- id: check-added-large-files
- id: detect-private-key
- id: check-yaml
- id: check-toml
- id: check-json
- id: check-docstring-first
- id: pretty-format-json
args: [ --autofix, --no-sort-keys ]
- repo: local
hooks:
- id: format
name: Format Code
entry: make format
language: system
pass_filenames: false
stages: [ pre-commit ]
- id: lint
name: Check Code Style
entry: make lint
language: system
pass_filenames: false
stages: [ pre-commit ]
- id: test
name: Run Tests
entry: make nexttest
language: system
pass_filenames: false

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MIT License
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# Load environment variables from .env file
ifneq (,$(wildcard ./.env))
include .env
export $(shell sed 's/=.*//' .env)
else
$(warning .env file not found. Environment variables not loaded.)
endif
# Variables
PROJ_REPO = github.com/habedi/template-rust-project
BINARY_NAME := $(or $(PROJ_BINARY), $(notdir $(PROJ_REPO)))
BINARY := target/release/$(BINARY_NAME)
PATH := /snap/bin:$(PATH)
DEBUG_PROJ := 0
RUST_BACKTRACE := 1
ASSET_DIR := assets
TEST_DATA_DIR := tests/testdata
SHELL := /bin/bash
# Default target
.DEFAULT_GOAL := help
.PHONY: help
help: ## Show help messages for all available targets
@grep -E '^[a-zA-Z_-]+:.*## .*$$' Makefile | \
awk 'BEGIN {FS = ":.*## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
.PHONY: format
format: ## Format Rust files
@echo "Formatting Rust files..."
@cargo fmt
.PHONY: test
test: format ## Run the tests
@echo "Running tests..."
@DEBUG_PROJ=$(DEBUG_PROJ) RUST_BACKTRACE=$(RUST_BACKTRACE) cargo test --all-targets --workspace -- --nocapture
.PHONY: coverage
coverage: format ## Generate test coverage report
@echo "Generating test coverage report..."
@DEBUG_PROJ=$(DEBUG_PROJ) cargo tarpaulin --out Xml --out Html
.PHONY: build
build: format ## Build the binary for the current platform
@echo "Building the project..."
@DEBUG_PROJ=$(DEBUG_PROJ) cargo build --release
.PHONY: run
run: build ## Build and run the binary
@echo "Running the $(BINARY) binary..."
@DEBUG_PROJ=$(DEBUG_PROJ) ./$(BINARY)
.PHONY: clean
clean: ## Remove generated and temporary files
@echo "Cleaning up..."
@cargo clean
@rm -f $(ASSET_DIR)/*.svg && echo "Removed SVG files; might want to run 'make figs' to regenerate them."
.PHONY: install-snap
install-snap: ## Install a few dependencies using Snapcraft
@echo "Installing the snap package..."
@sudo apt-get update
@sudo apt-get install -y snapd graphviz wget
@sudo snap refresh
@sudo snap install rustup --classic
.PHONY: install-deps
install-deps: install-snap ## Install development dependencies
@echo "Installing dependencies..."
@rustup component add rustfmt clippy
@cargo install cargo-tarpaulin
@cargo install cargo-audit
@cargo install cargo-careful
@cargo install cargo-nextest
.PHONY: lint
lint: format ## Run the linters
@echo "Linting Rust files..."
@DEBUG_PROJ=$(DEBUG_PROJ) cargo clippy -- -D warnings -D clippy::unwrap_used -D clippy::expect_used
.PHONY: publish
publish: ## Publish the package to crates.io (requires CARGO_REGISTRY_TOKEN to be set)
@echo "Publishing the package to Cargo registry..."
@cargo publish --token $(CARGO_REGISTRY_TOKEN)
.PHONY: bench
bench: ## Run the benchmarks
@echo "Running benchmarks..."
@DEBUG_PROJ=$(DEBUG_PROJ) cargo bench
.PHONY: audit
audit: ## Run security audit on Rust dependencies
@echo "Running security audit..."
@cargo audit
.PHONY: rust-careful
careful: ## Run security checks on Rust code
@echo "Running security checks..."
@cargo careful
.PHONY: docs
docs: format ## Generate the documentation
@echo "Generating documentation..."
@cargo doc --no-deps --document-private-items
.PHONE: figs
figs: ## Generate the figures in the assets directory
@echo "Generating figures..."
@$(SHELL) $(ASSET_DIR)/make_figures.sh $(ASSET_DIR)
.PHONY: fix-lint
fix-lint: ## Fix the linter warnings
@echo "Fixing linter warnings..."
@cargo clippy --fix --allow-dirty --allow-staged --all-targets --workspace --all-features -- -D warnings -D clippy::unwrap_used -D clippy::expect_used
.PHONY: testdata
testdata: ## Download the datasets used in tests
@echo "Downloading test data..."
@$(SHELL) $(TEST_DATA_DIR)/download_datasets.sh $(TEST_DATA_DIR)
.PHONY: nextest
nextest: ## Run tests using nextest
@echo "Running tests using nextest..."
@DEBUG_PROJ=$(DEBUG_PROJ) RUST_BACKTRACE=$(RUST_BACKTRACE) cargo nextest run
.PHONY: setup-hooks
setup-hooks: ## Install Git hooks (pre-commit and pre-push)
@echo "Setting up Git hooks..."
@if ! command -v pre-commit &> /dev/null; then \
echo "pre-commit not found. Please install it using 'pip install pre-commit'"; \
exit 1; \
fi
@pre-commit install --hook-type pre-commit
@pre-commit install --hook-type pre-push
@pre-commit install-hooks
.PHONY: test-hooks
test-hooks: ## Test Git hooks on all files
@echo "Testing Git hooks..."
@pre-commit run --all-files --show-diff-on-failure

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## Integrations
---
To be added.
### License
This project is licensed under either of these:
* MIT License (see [LICENSE-MIT](LICENSE-MIT))
* Apache License, Version 2.0 (see [LICENSE-APACHE](LICENSE-APACHE))

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# Garnet findings
Date: 2026-03-24
Path inspected: `./tmp/garnet`
## Plain-English summary
`./tmp/garnet` is a small experiment for calling Rust from Haskell.
The flow is:
1. Define Rust functions and data types.
2. Export them as a C ABI.
3. Generate a C header with `cbindgen`.
4. Generate Haskell-side low-level bindings with `hs-bindgen`.
5. Add hand-written Haskell wrappers on top.
6. Run a demo executable to show the setup works.
This looks like a prototype or reference repo, not a finished product.
## What it is
This is a mixed Haskell/Rust FFI demo.
It contains:
- a Cabal package named `garnet`
- a Rust static library in `./tmp/garnet/rust`
- Haskell modules for raw bindings and higher-level wrappers
- a small executable that exercises the API
- a shell build script
- a Nix flake for the development environment
## What it is trying to prove
The repo appears to be testing whether this toolchain is practical:
Rust -> `cbindgen` -> C header -> `hs-bindgen` -> Haskell wrappers
It also tests whether the approach can handle more than trivial examples, including:
- C strings
- plain structs
- enums
- simple arithmetic
- recursive tree-shaped data
## Key files
- `./tmp/garnet/rust/lib.rs`
- Rust definitions for exported FFI functions and example types
- `./tmp/garnet/rust/build.rs`
- generates `garnet_rs.h` and patches it for compatibility with `hs-bindgen`
- `./tmp/garnet/lib/GarnetRs/Raw.hs`
- drives low-level binding generation from the generated header
- `./tmp/garnet/lib/GarnetRs/Wrapped.hs`
- adds Haskell-friendly wrapper types and conversion code
- `./tmp/garnet/exe/Main.hs`
- demo executable using the wrapper API
- `./tmp/garnet/build`
- custom build script for Rust + Cabal coordination
## Easy reading of the design
### Rust side
The Rust library exports a handful of example FFI functions:
- `hello`
- `hello_struct`
- `hello_shape`
- `add`
- `sum_tree`
These are not a product API. They are examples chosen to stress different interop cases.
### Haskell side
The Haskell code is split into two layers:
- `GarnetRs.Raw`
- low-level generated bindings
- `GarnetRs.Wrapped`
- nicer Haskell-facing types and functions
This separation is a good design choice. It keeps generated code concerns away from the public API.
## Critical assessment
This repo is technically promising, but clearly unfinished.
What looks good:
- It demonstrates the full end-to-end workflow.
- It goes beyond the easiest possible FFI examples.
- It keeps raw and wrapped APIs separate.
- It includes a dev shell, which improves reproducibility.
What looks weak:
- The build flow is manual and somewhat brittle.
- The project depends on pinned git sources and alpha-stage tooling.
- The Rust build script contains a workaround for upstream tooling issues.
- The Haskell wrapper layer still requires manual boilerplate.
- There is no obvious sign of tests, CI, or a stability story.
## Pros of the approach
- **Clear architecture**: raw bindings and ergonomic wrappers are separated well.
- **Good exploration value**: useful for learning the actual friction points in Rust/Haskell interop.
- **Covers realistic cases**: includes enums and recursive data, not just simple integers.
- **Small and understandable**: the repo is compact enough to inspect quickly.
- **Useful as a reference**: someone exploring `hs-bindgen` could learn from it.
## Cons of the approach
- **Custom build glue**: the shell script and symlink step suggest the toolchain is not yet smooth.
- **Dependency fragility**: pinned git dependencies increase maintenance burden.
- **Tooling immaturity**: the repo already needs local workarounds for upstream issues.
- **Manual wrapper overhead**: generated bindings do not remove the need for hand-written API cleanup.
- **Potential safety complexity**: FFI, pointer conversions, and `unsafe` code are easy to get wrong.
- **Weak production story**: this setup does not yet look ready for long-term team use.
## Status of the work
My assessment of current status:
- **Stage**: proof of concept / exploration
- **Scope**: enough code exists to show the full path works
- **Maturity**: decent as an experiment, weak as a reusable foundation
- **Stability**: uncertain because of upstream pins and workarounds
- **Readiness**: not production-ready
In simple terms: this looks like “we got it working” rather than “we finished the system.”
## Likely next problems if this grows
If someone tried to turn this into a serious integration layer, the next hard problems would likely be:
- making the build process less custom
- reducing wrapper boilerplate
- keeping generated headers and bindings in sync
- handling more complex Rust types safely
- upgrading upstream tooling without breakage
- adding tests that catch FFI regressions early
## Bottom line
`./tmp/garnet` is a useful and interesting interop prototype.
It succeeds as a demonstration that Rust -> C header -> Haskell bindings -> Haskell wrapper can work. But it also shows the current cost of that path: manual build glue, unstable dependencies, wrapper code, and reliance on tool-specific workarounds.
Overall: good experiment, useful reference, not mature infrastructure yet.

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[project]
name = "integrations"
version = "0.1.0"
description = "Python environment for the integrations project"
requires-python = ">=3.10,<4.0"
dependencies = [
"maturin[zig] (>=1.8.3,<2.0.0)",
"numpy (>=2.2.6,<3.0.0)",
]

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[toolchain]
channel = "1.83.0"
components = ["rustfmt", "clippy", "rust-analyzer"]

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use std::ffi::OsString;
use tracing::error;
pub fn run(args: impl IntoIterator<Item = OsString>) -> Result<(), i32> {
let _args: Vec<OsString> = args.into_iter().collect();
// Your implementation here
// Expecting at least 2 arguments
if _args.len() < 2 {
error!("Expecting at least 2 arguments");
return Err(1);
}
Ok(())
}
// Unit tests
#[cfg(test)]
mod tests {
use super::*;
use std::ffi::OsString;
#[test]
fn test_run_with_valid_args() {
let args = vec![OsString::from("arg1"), OsString::from("arg2")];
let result = run(args);
assert!(result.is_ok());
}
#[test]
fn test_run_with_invalid_args() {
let args = vec![OsString::from("invalid_arg")];
let result = run(args);
assert!(result.is_err());
}
}

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pub mod cli;
pub mod logging;

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use ctor::ctor;
use tracing::Level;
use tracing_subscriber;
#[ctor]
fn set_debug_level() {
// If DEBUG_PROJ is not set or set to false, disable logging. Otherwise, enable logging
if std::env::var("DEBUG_PROJ").map_or(true, |v| v == "0" || v == "false" || v.is_empty()) {
// Disable logging
} else {
tracing_subscriber::fmt()
.with_max_level(Level::DEBUG)
.init();
}
//println!("DEBUG_PROJ: {:?}", std::env::var("DEBUG_PROJ"));
}

7
rust/main.rs Normal file
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@ -0,0 +1,7 @@
use template_rust_project::cli::run;
fn main() {
if let Err(code) = run(std::env::args_os()) {
std::process::exit(code);
}
}