#!/usr/bin/env bash
#
# Reformats a given list of files to match the rocSOLVER style guidelines.

display_help() {
    cat <<EOF
rocSOLVER auto-format script

This script changes the given source files to comply with rocSOLVER formatting
guidelines. It updates the copyright date, ensures files are ASCII-encoded
fixes minor whitespace issues, and applies clang-format.

Usage:
  $0 [--no-clang-format] [--help] [--] files...

Options:
  --help                      Print this help message.

  --no-clang-format           Skip the clang-format step.
EOF
}

PATH="$(git rev-parse --git-path hooks):/opt/rocm-4.3.1/llvm/bin:/opt/rocm-4.3.0/llvm/bin:$PATH"
export PATH

# Redirect stdout to stderr.
exec >&2

# Set defaults
apply_clang_format=true

# Check getopt version
getopt -T
if [[ $? -ne 4 ]]; then
    echo 'getopt version check failed'
    exit 1
fi

# Parse options
GETOPT_PARSE=$(getopt --name "$0" --longoptions help,no-clang-format --options '' -- "$@")
if [[ $? -ne 0 ]]; then
    exit 1
fi
eval set -- "$GETOPT_PARSE"
while true; do
    case "$1" in
        --help)
            display_help
            exit ;;
        --no-clang-format)
            apply_clang_format=false
            shift ;;
        --) shift ; break ;;
    esac
done

# Change the copyright date at the top of any text files
for file in "$@"; do
    perl -pi -e 'INIT { exit 1 if !-f $ARGV[0] || -B $ARGV[0]; $year = (localtime)[5] + 1900 }
        s/^([*\/#[:space:]]*)Copyright\s+(?:\(C\)\s*)?(\d+)(?:\s*-\s*\d+)?/qq($1Copyright (C) $2@{[$year != $2 ? "-$year" : ""]})/ie
        if $. < 10' -- "$file"
done

# Do the formatting
for file in "$@"; do
    if echo "$file" | grep -Eq '\.c$|\.h$|\.hpp$|\.cpp$|\.cl$|\.in$|\.txt$|\.yaml$|\.sh$|\.py$|\.pl$|\.cmake$|\.md$|\.rst$|\.groovy$|\.m$'; then
        sed -i -e 's/[[:space:]]*$//' -- "$file" # Remove whitespace at end of lines
        sed -i -e '$a\' -- "$file" # Add missing newline to end of file

        # Convert UTF8 non-ASCII to ASCII
        temp=$(mktemp)
        [[ -w $temp ]] || exit
        iconv -s -f utf-8 -t ascii//TRANSLIT -- "$file" > "$temp" || exit
        chmod --reference="$file" -- "$temp" || exit
        mv -f -- "$temp" "$file" || exit
    fi
done

# Run clang-format on C/C++ files
if [[ "$apply_clang_format" == true ]]; then
    for file in "$@"; do
        if echo "$file" | grep -Eq '\.c$|\.h$|\.hpp$|\.cpp$|\.cl$|\.h\.in$|\.hpp\.in$|\.cpp\.in$'; then
            clang-format -i -style=file -- "$file"
        fi
    done
fi