#!/bin/sh

#
# Reformat code, but do not touch if no changes.
#

if [ "$0" != "./build-scripts/format-code" -a "$0" != "build-scripts/format-code" ]; then
    echo "Please run me from the root checkout dir"
    exit 1
fi

if [ $# = 0 ]; then
    echo usage: $0 file...
    echo
    echo format C++ files, does not touch non-regular files
    exit 0
fi
if [ ! -e .clang-format ]; then
    echo "No .clang-format file found in .";
    exit 1
fi

verbose=0
if [ -t 1 ]; then
    verbose=1
fi
if [ x$CIRCLECI = xtrue ]; then
    verbose=0
fi

FORMAT=clang-format-8
if ! which $FORMAT 2> /dev/null; then
    FORMAT=clang-format
fi

if [ $verbose = 1 ]; then
    echo Using executable $FORMAT
fi

for file in "${@}"; do
    if [ -h "$file" -o ! -f "$file" ]; then
        if [ $verbose = 1 ]; then
            echo "$file: skipped, not a regular file or unreadable"
        fi
        continue
    fi
    tmp=$(mktemp "$file.XXXXXXXX")
    if ! $FORMAT -style=file "$file" > "$tmp"; then
        rm "$tmp"
    else
        if ! cmp -s "$file" "$tmp"; then
            echo "$file: reformatted"
            mv "$tmp" "$file"
        else
            if [ $verbose = 1 ]; then
                echo "$file: already formatted to perfection"
            fi
            rm "$tmp"
        fi
    fi
done