#!/bin/sh

# This wrapper script takes a given archive (static library) and processes it,
# either removing/renaming symbols according to the provided arguments.

BAZEL_EXECROOT=
ARCHIVE_TOOL=
OBJCOPY_TOOL=
INPUT_FILE=
OUTPUT_FILE=
STAGE_NUMBER=0

RENAME_FILE=

ARGS=()

set -e

while [[ $# -gt 0 ]]; do
    case $1 in
        --archive)
            ARCHIVE_TOOL="$2"
            shift; shift; ;;
        --objcopy)
            OBJCOPY_TOOL="$2"
            shift; shift; ;;
        --input)
            INPUT_FILE="$2"
            shift; shift; ;;
        --output)
            OUTPUT_FILE="$2"
            shift; shift; ;;
        --remove|--redefine)
            ARGS+=("$1")
            shift ; ;;
        -*)
            echo "Unknown option $1"
            exit 1 ; ;;
        *)
            ARGS+=("$1")
            shift ; ;;
    esac
done

set -- "${ARGS[@]}"

if [[ $# -eq 0 ]]; then
    echo "No modification to be performed."
    exit 2;
fi

IN=${INPUT_FILE}
while [[ $# -gt 0 ]]; do
    OUT=${OUTPUT_FILE}.stage${STAGE_NUMBER}
    case $1 in
        --remove)
            # Avoid read-only input file.
            cat $IN > $OUT && $ARCHIVE_TOOL d $OUT @$2

            shift; shift; ;;
        --redefine)
            $OBJCOPY_TOOL --redefine-syms $2 --weaken $IN $OUT
            shift; shift; ;;
        *)
            echo "Bad argument: $1"
            exit 3 ; ;;
    esac
    STAGE_NUMBER=$((STAGE_NUMBER+1))
    IN=$OUT
done


mv $IN $OUTPUT_FILE