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#!/usr/bin/env bash
# give libnftnl C library dir as first argument and output binding as second.
# Example:
# $ ./generate_bindings.sh ../../libnftnl-1.0.8 src/nftnl_1_0_8.rs
set -ue
LIBNFTNL_PATH=$1
BINDING_PATH=$2
echo "Writing the result to $BINDING_PATH"
bindgen \
--no-doc-comments \
--use-core \
--no-prepend-enum-name \
--whitelist-function '^nftnl_.+$' \
--whitelist-type '^nftnl_.+$' \
--whitelist-var '^nftnl_.+$' \
--whitelist-var '^NFTNL_.+$' \
--blacklist-type '(FILE|iovec)' \
--blacklist-type '^_IO_.+$' \
--blacklist-type '^__.+$' \
--blacklist-type 'nlmsghdr' \
--raw-line 'use libc::{c_char, c_int, c_void, iovec, nlmsghdr, FILE};' \
--raw-line 'use core::option::Option;' \
--ctypes-prefix 'libc' \
-o $BINDING_PATH \
libnftnl.h --\
-I$LIBNFTNL_PATH/include
# Tidy up and correct things I could not manage to configure bindgen to do for me
sed -i 's/libc::\(c_[a-z]*\)/\1/g' $BINDING_PATH
sed -i 's/::core::option::Option/Option/g' $BINDING_PATH
sed -i 's/_bindgen_ty_[0-9]\+/u32/g' $BINDING_PATH
sed -i 's/pub type u32 = u32;//g' $BINDING_PATH
sed -i '/#\[derive(Debug, Copy, Clone)\]/d' $BINDING_PATH
# Change struct bodies to (c_void);
# Search regex: {\n +_unused: \[u8; 0],\n}
# Replace string: (c_void);\n
sed -i -e '/^pub struct .* {$/ {
N;N
s/ {\n *_unused: \[u8; 0\],\n}/(c_void);\n/
}' "$BINDING_PATH"
# Remove all }\nextern "C" { to condense code a bit
# Search regex: }\nextern "C" {
# Replace string:
sed -i -e '/^extern "C" {$/ {
:loop
n
/^}$/! b loop
/^}$/ {
N
t reset_condition_flags
:reset_condition_flags
s/}\nextern "C" {//
t loop
}
}' "$BINDING_PATH"
# Add bindgen version to comment at start of file
sed -i "1s/bindgen/$(bindgen --version)/" $BINDING_PATH
rustfmt $BINDING_PATH
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