#!/bin/bash
#
# This pre-commit hook checks if any versions of clang-format
# are installed, and if so, uses the installed version to format
# the staged changes.

format=/opt/rocm/hcc/bin/clang-format

# Redirect stdout to stderr.
exec >&2

# Do everything from top - level
cd $(git rev-parse --show-toplevel)

if git rev-parse --verify HEAD >/dev/null 2>&1; then
    against=HEAD
else
    # Initial commit: diff against an empty tree object
    against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

# Change the copyright date at the top of any text files
for file in $(git diff-index --cached --name-only $against); do
    /usr/bin/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 $2@{[$year != $2 ? "-$year" : ""]})/ie
            if $. < 10' "$file" && git add -u "$file"
done

# do the formatting
for file in $(git diff-index --cached --name-only $against | grep -E '\.c$|\.h$|\.hpp$|\.cpp$|\.cl$|\.in$|\.txt$|\.yaml$|\.sh$|\.py$|\.pl$|\.cmake$|\.md$|\.rst$'); do
    if [[ -e $file ]]; then
        sed -i -e 's/[[:space:]]*$//' "$file" # Remove whitespace at end of lines
        sed -i -e '$a\' "$file" # Add missing newline to end of file
        git add -u "$file"
    fi
done

# if clang-format exists, run it on C/C++ files
if [[ -x $format ]]; then
    for file in $(git diff-index --cached --name-only $against | grep -E '\.c$|\.h$|\.hpp$|\.cpp$|\.cl$|\.h\.in$|\.hpp\.in$|\.cpp\.in$'); do
        if [[ -e $file ]]; then
            echo "$format $file"
            "$format" -i -style=file "$file"
            git add -u "$file"
        fi
    done
fi