#!/usr/bin/env sh

# Builds documentation for all target triples that we have a registered URL for
# in liblibc. This scrapes the list of triples to document from `src/lib.rs`
# which has a bunch of `html_root_url` directives we pick up.

set -ex

TARGET_DOC_DIR=target/doc
README=README.md
PLATFORM_SUPPORT=platform-support.md

rm -rf $TARGET_DOC_DIR
mkdir -p $TARGET_DOC_DIR

if ! rustc --version | grep -E "nightly" ; then
    echo "Building the documentation requires a nightly Rust toolchain"
    exit 1
fi

rustup component add rust-src
cargo +nightly install cargo-xbuild

# List all targets that do currently build successfully:
# shellcheck disable=SC1003
grep '[\d|\w|-]* \\' ci/build.sh > targets
sed -i.bak 's/ \\//g' targets
grep '^[_a-zA-Z0-9-]*$' targets | sort > tmp && mv tmp targets

# Create a markdown list of supported platforms in $PLATFORM_SUPPORT
rm $PLATFORM_SUPPORT || true

printf '### Platform-specific documentation\n' >> $PLATFORM_SUPPORT

while read -r target; do
    echo "documenting ${target}"

    case "${target}" in
        *apple*)
            # FIXME:
            # We can't build docs of apple targets from Linux yet.
            continue
            ;;
        *)
            ;;
    esac

    rustup target add "${target}" || true

    # Enable extra configuration flags:
    export RUSTDOCFLAGS="--cfg freebsd11"

    # If cargo doc fails, then try xargo:
    if ! cargo doc --target "${target}" \
             --no-default-features  --features extra_traits ; then
        cargo xdoc --target "${target}" \
              --no-default-features  --features extra_traits
    fi

    cp -r "target/${target}/doc" "${TARGET_DOC_DIR}/${target}"

    echo "* [${target}](${target}/libc/index.html)" >> $PLATFORM_SUPPORT
done < targets

# Replace <div class="platform_support"></div> with the contents of $PLATFORM_SUPPORT
cp $README $TARGET_DOC_DIR
line=$(grep -n '<div class="platform_docs"></div>' $README | cut -d ":" -f 1)

set +x
{ head -n "$((line-1))" $README; cat $PLATFORM_SUPPORT; tail -n "+$((line+1))" $README; } > $TARGET_DOC_DIR/$README
set -x

# Copy the licenses
cp LICENSE-* $TARGET_DOC_DIR/