Add continuous integration and fix errors

Author: Chris00

.github/workflows/CI.yml

@@ -0,0 +1,70 @@
+name: CI
+on: [push, pull_request]
+
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - stable
+          - nightly
+    steps:
+      - run: sudo apt-get update -y
+      - run: sudo apt-get install -y libmfem-dev
+      - uses: actions/checkout@v2
+      - run: |
+          git submodule init
+          git submodule update
+      - run: |
+          rustup update ${{ matrix.rust }}
+          rustup default ${{ matrix.rust }}
+          rustup component add clippy
+      - run: cargo clippy -p mfem-sys --features bundled -- -D warnings
+      - run: cargo build -p mfem-sys --features bundled
+      - run: cargo run -p mfem-sys --features bundled --example ex1 -- --mesh data/square.mesh
+
+  build-osx:
+    runs-on: macos-latest
+    strategy:
+      matrix:
+        rust:
+          - stable
+          - nightly
+    steps:
+      - run: brew update
+      - name: Install MPI
+        run: brew reinstall open-mpi
+      - run: brew install mfem
+      - uses: actions/checkout@v2
+      - run: |
+          rustup update ${{ matrix.rust }}
+          rustup default ${{ matrix.rust }}
+      - run: cargo build -p mfem-sys
+      - run: cargo run -p mfem-sys --example ex1 -- --mesh data/square.mesh
+
+  build-windows:
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        rust:
+          - stable
+          - nightly
+    steps:
+      - uses: actions/checkout@v2
+      - run: |
+          rustup update ${{ matrix.rust }}
+          rustup default ${{ matrix.rust }}
+      - run: cargo build -p mfem-sys --features bundled
+      - run: cargo run -p mfem-sys --features bundled --example ex1 -- --mesh data/square.mesh
+
+  fmt:
+    name: Rust fmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: |
+          rustup update
+          rustup default stable
+          rustup component add rustfmt
+      - run: cargo fmt --all -- --check

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "crates/mfem-cpp/mfem"]
 	path = crates/mfem-cpp/mfem
-	url = git@github.com:mfem/mfem.git
+	url = https://github.com/mfem/mfem.git

crates/mfem-sys/MFEM/CMakeLists.txt

@@ -12,6 +12,10 @@ else()
    find_package(mfem REQUIRED NAMES MFEM)
 endif()
 
+if (NOT DEFINED MFEM_INCLUDE_DIRS)
+  set(MFEM_INCLUDE_DIRS "")
+endif()
+
 file (WRITE ${CMAKE_BINARY_DIR}/mfem_info.txt
       "VERSION=${MFEM_VERSION}\n"
       "MFEM_LIBRARIES=${MFEM_LIBRARIES}\n"

crates/mfem-sys/build.rs

@@ -1,5 +1,3 @@
-/// The list of used MFEM libraries which needs to be linked with.
-
 fn main() {
     let target = std::env::var("TARGET").expect("No TARGET environment variable defined");
     let is_windows = target.to_lowercase().contains("windows");

data/square.mesh

@@ -0,0 +1,24 @@
+MFEM mesh v1.0
+
+dimension
+2
+
+elements
+2
+1 2 0 1 2
+1 2 0 2 3
+
+boundary
+4
+1 1 0 1
+1 1 1 2
+1 1 2 3
+1 1 3 0
+
+vertices
+4
+2
+0.0 0.0
+1.0 0.0
+1.0 1.0
+0.0 1.0