feat(ffi): Initial C API for hyper

capi/gen_header.sh

@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+
+CAPI_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+WORK_DIR=`mktemp -d`
+
+
+# check if tmp dir was created
+if [[ ! "$WORK_DIR" || ! -d "$WORK_DIR" ]]; then
+    echo "Could not create temp dir"
+    exit 1
+fi
+
+header_file_backup="$CAPI_DIR/include/hyper.h.backup"
+
+function cleanup {
+    #echo "$WORK_DIR"
+    rm -rf "$WORK_DIR"
+    rm "$header_file_backup"
+}
+
+trap cleanup EXIT
+
+mkdir "$WORK_DIR/src"
+
+# Fake a library
+cat > "$WORK_DIR/src/lib.rs" << EOF
+#[path = "$CAPI_DIR/../src/ffi/mod.rs"]
+pub mod ffi;
+EOF
+
+# And its Cargo.toml
+cat > "$WORK_DIR/Cargo.toml" << EOF
+[package]
+name = "hyper"
+version = "0.0.0"
+edition = "2018"
+publish = false
+
+[dependencies]
+EOF
+
+cp "$CAPI_DIR/include/hyper.h" "$header_file_backup"
+
+#cargo metadata --no-default-features --features ffi --format-version 1 > "$WORK_DIR/metadata.json"
+
+cd $WORK_DIR
+
+# Expand just the ffi module
+cargo rustc -- -Z unstable-options --pretty=expanded > expanded.rs 2>/dev/null
+
+# Replace the previous copy with the single expanded file
+rm -rf ./src
+mkdir src
+mv expanded.rs src/lib.rs
+
+
+# Bindgen!
+cbindgen\
+    -c "$CAPI_DIR/cbindgen.toml"\
+    --lockfile "$CAPI_DIR/../Cargo.lock"\
+    -o "$CAPI_DIR/include/hyper.h"\
+    $1
+
+bindgen_exit_code=$?
+
+if [[ "--verify" == "$1" && "$bindgen_exit_code" != 0 ]]; then
+    echo "diff generated (<) vs backup (>)"
+    diff "$CAPI_DIR/include/hyper.h" "$header_file_backup"
+fi
+
+exit $bindgen_exit_code